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HomeProductsDiscrete Semiconductor ProductsThyristors - TRIACsBTB24-800CWRG
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BTB24-800CWRG - STMicroelectronics

Manufacturer Part Number
BTB24-800CWRG
Manufacturer
STMicroelectronics
Allelco Part Number
32D-BTB24-800CWRG
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
30,874 pcs available, New & Original
Parts Description
TRIAC ALTERNISTOR 800V TO220AB
Package
TO-220
Data sheet
BTB24-800CWRG.pdf
RoHs Status
ROHS3 Compliant
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In stock: 30874
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1+ $1.524 $1.52
10+ $1.326 $13.26
30+ $1.202 $36.06
100+ $0.936 $93.60
500+ $0.879 $439.50
1000+ $0.854 $854.00
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Specifications

BTB24-800CWRG Tech Specifications
STMicroelectronics - BTB24-800CWRG technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics - BTB24-800CWRG

Product Attribute Attribute Value
Manufacturer STMicroelectronics
Voltage - Off State 800 V
Voltage - Gate Trigger (Vgt) (Max) 1.3 V
Triac Type Alternistor - Snubberless
Supplier Device Package TO-220
Series Snubberless™
Package / Case TO-220-3
Package Tube
Product Attribute Attribute Value
Operating Temperature -40°C ~ 125°C (TJ)
Mounting Type Through Hole
Current - On State (It (RMS)) (Max) 25 A
Current - Non Rep. Surge 50, 60Hz (Itsm) 250A, 260A
Current - Hold (Ih) (Max) 50 mA
Current - Gate Trigger (Igt) (Max) 35 mA
Configuration Single
Base Product Number BTB24

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8541.30.0080

Parts Introduction

BTB24-800CWRG Image
BTB24-800CWRG (1)

Manufacturer Part Number

BTB24-800CWRG

Manufacturer

STMicroelectronics

Introduction

The BTB24-800CWRG is a Snubberless™ TRIAC designed for AC power control applications.

Product Features and Performance

Snubberless™ technology for high commutation performance

Alternistor - Snubberless Triac Type

800V Off State Voltage

25A RMS On-State Current

Gate Trigger Voltage (Vgt) of 1.3V max

Non-Repetitive Surge Current of 250A (50Hz), 260A (60Hz)

Gate Trigger Current (Igt) of 35mA max

Holding Current (Ih) of 50mA max

Single Configuration

Operating Temperature Range from -40°C to 125°C (TJ)

Product Advantages

High voltage capability suitable for various applications

Increased robustness against high surge events

Ease of triggering with low gate trigger current

Good thermal performance with through-hole mounting

BTB24-800CWRG Image
BTB24-800CWRG (2)

Key Technical Parameters

Voltage - Off State: 800V

Current - On State (It (RMS)): 25A

Voltage - Gate Trigger (Vgt) (Max): 1.3V

Current - Non Rep. Surge 50/60Hz (Itsm): 250A/260A

Current - Gate Trigger (Igt) (Max): 35mA

Current - Hold (Ih) (Max): 50mA

Operating Temperature: -40°C ~ 125°C

Quality and Safety Features

Compliance with international standards and norms

High reliability and functionality over wide operating conditions

Compatibility

Through Hole Mounting compatible with standard PCBs

TO-220-3 Case suitable for various circuit layouts

Application Areas

Motor control applications

Lighting systems

Industrial power tools

Home appliances

Product Lifecycle

Product Status: Active

Product has an established supply chain and is not near discontinuation

Replacements and upgrades are available

Several Key Reasons to Choose This Product

High voltage and current handling capacity for demanding applications

Snubberless™ technology minimizes snubbing requirements and enhances commutation

Ideal for applications requiring robust performance against surges

Low gate triggering current facilitates easier control

Wide operating temperature range ensures reliability across various environments

Backed by STMicroelectronics' reputation for quality and performance

Frequently Asked Questions(FAQ)

What are the key electrical characteristics of the BTB24-800CWRG that influence its suitability for mains voltage switching applications in industrial motor control systems?
The BTB24-800CWRG features a peak repetitive off-state voltage (VDRM) of 800 V and an RMS on-state current (IT(RMS)) of 25 A, making it suitable for AC mains switching at standard line voltages up to approximately 600 VAC. Its snubberless design eliminates the need for external RC networks, reducing component count and PCB complexity. However, the device’s gate trigger voltage (Vgt) is relatively high at 1.3 V, which may require sufficient gate drive current to ensure reliable turn-on under varying load conditions. In motor control applications, this triac must handle inrush currents during startup, where the non-repetitive surge current (ITSM) reaches up to 260 A at 60 Hz. Proper thermal management is essential due to power dissipation during conduction, particularly when driving inductive loads that exhibit phase-shifted current waveforms.
How does the BTB24-800CWRG compare to standard snubberless triacs like the BTA24-800BWRG in terms of holding current and commutation performance under capacitive load switching?
While both the BTB24-800CWRG and BTA24-800BWRG share identical voltage ratings and current capabilities, differences arise in their internal structures and hold current specifications. The BTB24-800CWRG has a maximum hold current (Ih) of 50 mA, slightly higher than typical values for comparable devices, which can affect zero-crossing detection sensitivity in phase-angle control circuits. This higher Ih reduces the likelihood of unintentional turn-off during low-current periods but may require careful gate drive timing in capacitive load scenarios where rapid current reversal occurs. Compared to non-alternistor versions, the alternistor architecture improves commutation reliability by enabling natural turn-off during negative half-cycles without external snubbers, though capacitive loads can still impose stress on the gate structure if dv/dt exceeds recommended limits—typically around 50–100 V/μs for such devices.
What considerations apply when selecting the BTB24-800CWRG for a solid-state relay (SSR) module intended for 230 VAC lighting control with inductive ballasts?
When using the BTB24-800CWRG in a 230 VAC SSR for lighting applications involving inductive ballasts (e.g., fluorescent or LED drivers), designers must account for the device’s ability to withstand di/dt transients caused by sudden load changes. Although rated for 25 A RMS, inductive loads generate back EMF and current spikes during turn-off, which may exceed the safe operating area (SOA) if not properly managed. The snubberless construction helps mitigate voltage ringing, but additional clamping diodes or transient voltage suppressors (TVS) across the main terminals are often advisable. Thermal resistance from junction to case (RθJC ≈ 1.7 K/W) necessitates adequate heatsinking, especially if ambient temperatures exceed 40°C. Gate drive isolation and triggering at or near zero-crossing further reduce electromagnetic interference (EMI) and extend device life.
Can the BTB24-800CWRG be safely used in a three-phase motor soft-starter application, and what limitations should be considered regarding current sharing and thermal derating?
The BTB24-800CWRG is generally not suitable for direct use in three-phase soft-starter topologies requiring bidirectional conduction across all phases simultaneously. As a single-pole device, it lacks the integrated structure needed for balanced phase control in such configurations. Moreover, even in single-phase implementations within a multi-device starter bank, individual thermal profiles may diverge due to manufacturing tolerances in hold current and conduction drop. For each BTB24-800CWRG employed, junction temperature must remain below 125°C; assuming a case temperature of 80°C, the allowable power dissipation drops to roughly (125–80)/1.7 ≈ 26 W. With an on-state voltage drop of ~1.7 V at 25 A, actual power loss reaches 42.5 W—exceeding this limit without sufficient airflow or forced cooling. Therefore, parallel operation requires careful matching and active thermal monitoring to prevent localized overheating.
How does the gate trigger current requirement of the BTB24-800CWRG impact opto-triac driver selection in low-power microcontroller-based switching designs?
The BTB24-800CWRG specifies a maximum gate trigger current (Igt) of 35 mA, indicating it requires a moderate gate drive capability to ensure fast and reliable turn-on under all operating conditions. This influences optocoupler selection in isolated gate drive circuits; for example, MOC3063 or similar opto-triacs must deliver sufficient peak current—typically 50–100 mA—to overcome the device’s threshold. If the driving opto-triac cannot supply this current, especially at elevated temperatures where Vgt increases slightly, the BTB24-800CWRG may fail to latch into conduction, resulting in intermittent operation or partial conduction. Additionally, the gate must be protected from negative voltages exceeding -5 V to prevent false triggering, requiring series resistors and clamping diodes in the gate circuit to maintain compatibility with standard logic-level microcontrollers.
What are the implications of the BTB24-800CWRG’s operating temperature range (-40°C to 125°C TJ) for automotive or outdoor industrial equipment deployments?
The BTB24-800CWRG supports a wide junction temperature range (-40°C to 125°C), enabling deployment in harsh environments such as industrial enclosures exposed to ambient temperature swings or automotive auxiliary systems. At -40°C, semiconductor mobility decreases, potentially increasing turn-on time slightly, but the device remains functional. Conversely, at 125°C, the maximum Igt can rise by up to 50%, complicating gate drive design unless compensated. Thermal cycling between these extremes accelerates package fatigue in the TO-220 housing, particularly at the lead bonds. Given its MSL rating of 1 (unlimited shelf life), long-term storage poses no risk, but soldering profiles must respect peak reflow temperatures below 260°C to preserve integrity. In outdoor installations, conformal coating may be necessary to prevent moisture ingress at the tab interface.
How does the BTB24-800CWRG’s non-repetitive surge current rating (ITSM = 250 A @ 50 Hz, 260 A @ 60 Hz) inform fuse coordination in overcurrent protection schemes?
The ITSM specification defines the peak current the BTB24-800CWRG can survive once during its lifetime under short-duration overloads, typically associated with transformer inrush or fault conditions. For a 60 Hz system, the device withstands 260 A for 8.3 ms (one half-cycle). To coordinate protection effectively, the circuit fuse or breaker should interrupt fault currents above this threshold before the triac experiences cumulative damage. Fast-acting fuses with melting integrals (I²t) lower than that of the BTB24-800CWRG’s SOA allow selective tripping without nuisance blowing during legitimate surges. However, since the device does not self-limit like an IGBT or MOSFET, excessive ITSM exposure—even once—can degrade internal metallization layers over time. Thus, while ITSM provides useful guidance, real-world reliability depends on limiting such events through proper system design rather than relying solely on surge tolerance.
Why might a designer choose the BTB24-800CWRG over a lower-voltage alternative like the BTB24-600BWRG despite higher component cost, and what risks emerge from voltage margin miscalculation?
Selecting the BTB24-800CWRG instead of the BTB24-600BWRG reflects anticipation of future voltage upgrades or presence of transient surges beyond nominal line levels—such as those caused by nearby lightning strikes or capacitor switching in distribution networks. An 800 V rating provides a safety margin of over 30% above 230 VAC peak (≈325 V), whereas 600 V devices offer only ~10% headroom, increasing susceptibility to failure under repeated dv/dt stress. However, overrating introduces trade-offs: the higher blocking voltage results in marginally thicker silicon, which can increase turn-off time slightly and elevate leakage current at elevated temperatures. Additionally, the larger die size contributes to higher RθJC, demanding more robust heatsinking. Misjudging the required voltage margin could either lead to premature failure (under-rating) or unnecessary thermal penalties (over-rating), underscoring the importance of environmental and transient analysis in final selection.
What layout and PCB design practices are critical when implementing the BTB24-800CWRG in a high-density power converter to minimize parasitic inductance and thermal hotspots?
Minimizing loop inductance between the BTB24-800CWRG’s main terminals and load is crucial to prevent voltage overshoot during commutation, which could exceed the device’s dv/dt rating (~100 V/μs). Short, wide traces or copper planes should connect the MT1 and MT2 pins directly to busbars or heavy pads, avoiding vias that introduce parasitic inductance. The TO-220’s metal tab must make full contact with a thermally conductive pad using thermal adhesive or solder, ensuring low thermal resistance (<1.5 K/W with mica insulator and bolt). Avoid placing heat-generating components near the tab edge to prevent localized heating. Decoupling capacitors placed close to the gate drive circuit reduce noise-induced misfiring, while Kelvin connections (if possible) improve gate signal integrity. These practices collectively enhance reliability in space-constrained designs common in industrial automation.
How does the BTB24-800CWRG’s configuration as a single alternistor affect its use in bridge or anti-parallel arrangements compared to dual-gate triacs?
The BTB24-800CWRG operates as a single alternistor, meaning it conducts in both directions symmetrically but requires two separate devices in anti-parallel (MT1 and MT2 swapped) to achieve full bi-directional control with independent gate triggering. Unlike dual-gate triacs (e.g., some MCR-series parts), there is no dedicated MT2 gate, so each direction must be driven via the same gate terminal with appropriate polarity handling in the driver circuit. This simplifies gate drive circuitry slightly but doubles component count in bridge configurations. In applications requiring regenerative braking or four-quadrant operation, this architecture adds complexity, as each half-cycle must be independently controlled. Nonetheless, for simple AC switching tasks like SSRs or light dimmers, the single alternistor suffices and offers cost savings over discrete pairs.
What role does the base product number BTB24 play in identifying compatible replacement parts, and how does BTB24-800CWRG fit within STMicroelectronics’ family of snubberless triacs?
The base product number BTB24 indicates that the BTB24-800CWRG shares core electrical and mechanical characteristics with other members of the BTB24 family, differing primarily in voltage rating (e.g., BTB24-400BWRG, BTB24-800CWRG). This standardization simplifies inventory management and ensures interchangeability in designs where voltage scaling is acceptable. All BTB24 variants are Snubberless™ Alternistors in TO-220 packaging, offering consistent thermal performance and gate drive requirements. Designers can substitute within the BTB24 series if the application allows voltage downgrading, provided the hold current and surge ratings remain adequate. However, cross-referencing datasheets is essential, as slight variations in Igt, Ih, or dv/dt exist between grades. Using the correct suffix (e.g., C vs. B) ensures alignment with specific performance curves critical for high-reliability systems.
Can the BTB24-800CWRG be paralleled for higher current applications, and what precautions are necessary to ensure current balance under dynamic load conditions?
Paralleling multiple BTB24-800CWRG devices is technically feasible but requires strict matching of parameters such as Igt, Ih, and on-state voltage drop to avoid unequal current sharing. Due to manufacturing variations, one device may conduct more heavily than others, leading to localized overheating. Each unit must have identical leads trimmed and soldered with minimal joint resistance. Series-connected ballast resistors (0.1–0.5 Ω per device) help stabilize sharing during turn-on transients but add conduction loss. Thermal coupling via shared heatsink improves dynamic balance, as temperature rise affects Ih inversely—higher junction temperature lowers hold current, naturally balancing conduction among devices. Nevertheless, for sustained currents approaching 50 A, discrete solutions like modular SSRs with integrated controllers are preferable to manual paralleling of BTB24-800CWRG units.
How does the ROHS3 compliance status of the BTB24-800CWRG influence global regulatory adherence, particularly in EU and California markets?
The BTB24-800CWRG’s ROHS3 compliance confirms exclusion of restricted substances including lead, mercury, cadmium, hexavalent chromium, PBBs, PBDEs, and four phthalates (DEHP, BBP, DBP, DIBP) at specified mass thresholds. This enables unrestricted use in electronic products destined for the European Union, China, Japan, and California under Proposition 65 exemptions for trace contaminants. Manufacturers benefit from reduced audit overhead and faster time-to-market for consumer and industrial equipment. Since the part carries no conflict minerals reporting obligations (no explicit mention in RoHS3), it also aligns with Dodd-Frank Section 1502 expectations. However, end-system designers must ensure complete bill-of-materials compliance, as subsidiary components (e.g., gate resistors, PCBs) can introduce violations regardless of the BTB24-800CWRG’s status.
What diagnostic signals or indirect indicators suggest impending failure of the BTB24-800CWRG in a deployed SSR, and how can early warning be incorporated into system health monitoring?
Early signs of degradation in the BTB24-800CWRG include increased leakage current (>50 μA at 400 V off-state), erratic gate triggering behavior (especially at low temperatures), and visible discoloration or cracking on the TO-220 package. Monitoring the SSR’s input power draw can reveal rising losses due to higher on-state voltage drop, indicating wear. Implementing optical feedback from the opto-isolator output allows detection of missed triggers, suggesting gate drive issues. Temperature sensors mounted near the heatsink provide thermal trending data; sustained operation above 110°C accelerates degradation. While the BTB24-800CWRG lacks built-in diagnostics, integrating shunt resistors with ADC sampling enables measurement of conduction loss trends. Predictive algorithms analyzing historical trigger success rates and thermal cycles can flag components nearing end-of-life before catastrophic failure occurs.
How does the BTB24-800CWRG’s dv/dt immunity specification interact with capacitive load switching, and what design mitigations are recommended?
The BTB24-800CWRG typically exhibits dv/dt immunity of 50–100 V/μs, derived from internal carrier lifetime and doping profile. During capacitive load switching (e.g., motor startup or capacitor bank energization), rapid voltage buildup across the device can induce displacement currents into the gate structure, causing unintended turn-on even without intentional gate drive. To mitigate this, gate-source series resistors (100–220 Ω) dampen oscillations and reduce sensitivity to parasitic capacitance coupling. Layout minimization of stray capacitance between MT1 and gate is essential. Additionally, employing zero-voltage switching techniques or soft-start circuits reduces the initial dv/dt exposure. If the expected dv/dt exceeds 100 V/μs, external snubber networks—though contrary to the “snubberless” claim—may become necessary, albeit at the cost of added complexity and loss.
What are the consequences of exceeding the BTB24-800CWRG’s maximum junction temperature (125°C) during continuous operation, and how can thermal modeling predict lifespan reduction?
Operating the BTB24-800CWRG above 125°C TJ violates absolute maximum ratings and accelerates degradation mechanisms such as electromigration in aluminum interconnects and oxide breakdown in gate regions. Even brief excursions into this range shorten lifetime exponentially according to Arrhenius models—typically halving lifespan for every 10°C increase beyond rated limits. Continuous operation at 130°C may reduce mean time between failures (MTBF) from >100,000 hours to <10,000 hours depending on duty cycle and cooling efficiency. Thermal modeling using tools like ANSYS Icepak or Mentor FloTHERM incorporates RθJA (junction-to-ambient resistance) derived from datasheet values and empirical measurements to simulate steady-state and transient temperatures. Including derating factors for altitude, orientation, and neighboring component heat sources ensures conservative predictions. Proactive thermal design avoids reliance on emergency shutdowns, preserving system availability.
In what scenarios would the BTB24-800CWRG outperform a MOSFET-based solid-state switch in terms of cost, simplicity, and AC handling capability?
The BTB24-800CWRG offers significant advantages over MOSFETs in pure AC switching applications such as resistive heating elements, incandescent lamps, or legacy motor controls where bidirectional conduction and zero-crossing compatibility are required. Unlike MOSFETs, which suffer from body diode conduction losses and require anti-parallel diodes for reverse current flow, the alternistor conducts equally in both directions with symmetric on-state characteristics. This eliminates component duplication and simplifies gate drive design. Additionally, the BTB24-800CWRG handles inductive kickback inherently during turn-off, whereas MOSFETs demand snubbers or active clamping. For 25 A RMS loads at 230 VAC, the total solution cost (including heatsink, gate driver, and isolation) often remains lower with the BTB24-800CWRG, especially in low-frequency (<1 kHz) systems where switching losses are negligible compared to conduction losses.

Parts with Similar Specifications

The three parts on the right have similar specifications to STMicroelectronics BTB24-800CWRG

Product Attribute BTB24-800BWRG BTB24-800BRG BTB41-800BRG BTB41-600BRG
Part Number BTB24-800BWRG BTB24-800BRG BTB41-800BRG BTB41-600BRG
Manufacturer STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Voltage - Off State - - - -
Current - Non Rep. Surge 50, 60Hz (Itsm) - - - -
Triac Type - - - -
Current - On State (It (RMS)) (Max) - - - -
Series - - - -
Current - Hold (Ih) (Max) - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Configuration - - - S/H-ADC
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Mounting Type - Surface Mount Through Hole Surface Mount
Voltage - Gate Trigger (Vgt) (Max) - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Current - Gate Trigger (Igt) (Max) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad

BTB24-800CWRG Datasheet PDF

Download BTB24-800CWRG pdf datasheets and STMicroelectronics documentation for BTB24-800CWRG - STMicroelectronics.

HTML Datasheet
Cylindrical Battery Holders.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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BTB24-800CWRG Image

BTB24-800CWRG

STMicroelectronics
32D-BTB24-800CWRG

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