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HomeProductsDiscrete Semiconductor ProductsTransistors - Bipolar (BJT) - Single2SC4520T-TD-E
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2SC4520T-TD-E - onsemi

Manufacturer Part Number
2SC4520T-TD-E
Manufacturer
onsemi
Allelco Part Number
32D-2SC4520T-TD-E
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
108,280 pcs available, New & Original
Parts Description
BIP NPN 1.5A 45V
Package
Bulk
Data sheet
-
RoHs Status
 
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In stock: 108280

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Specifications

2SC4520T-TD-E Tech Specifications
onsemi - 2SC4520T-TD-E technical specifications, attributes, parameters and parts with similar specifications to onsemi - 2SC4520T-TD-E

Product Attribute Attribute Value
Manufacturer onsemi
Series *
Product Attribute Attribute Value
Package Bulk

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status Not applicable
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status Vendor Undefined
ECCN EAR99

Frequently Asked Questions(FAQ)

What are the key electrical characteristics of the 2SC4520T-TD-E transistor that influence its use in switching applications, and how do these parameters compare to typical requirements for low-voltage motor control circuits?
The 2SC4520T-TD-E is a bipolar NPN transistor rated at 45V collector-to-emitter breakdown voltage (V_CEO) and a continuous collector current (I_C) of 1.5A. These ratings support moderate-power switching tasks such as driving small DC motors or relay coils. In a typical 12V motor control circuit drawing up to 1.2A, the device can handle the load with sufficient margin under normal conditions. However, due to its relatively modest current gain (h_FE), which may drop significantly near saturation, designers must ensure adequate base drive to maintain reliable turn-on—especially under inductive loads where transient spikes could approach the 45V limit. Compared to modern MOSFETs in similar roles, the 2SC4520T-TD-E trades higher conduction losses for simpler gate-drive requirements but lacks built-in protection features like flyback diodes, necessitating external snubbers.
How does the thermal performance of the 2SC4520T-TD-E affect reliability when used in continuous-duty switching scenarios, and what layout considerations are critical for maintaining junction temperature below safe operating limits?
With no specified case-to-ambient thermal resistance in bulk packaging, the 2SC4520T-TD-E relies entirely on PCB copper area and airflow for heat dissipation. At a continuous collector current of 1.5A and assuming a saturated voltage drop of approximately 1.8V, power dissipation reaches ~2.7W. Without a heatsink, this can elevate the junction temperature by tens of degrees Celsius above ambient, potentially triggering thermal shutdown or accelerated aging. Engineers should allocate at least 2–3 cm² of solid copper on both sides of the PCB adjacent to the transistor pad and avoid routing high-current traces underneath. Thermal vias connecting internal layers improve heat spreading, but long-term reliability demands derating—typically limiting continuous operation to 1.2A or reducing duty cycle accordingly.
Can the 2SC4520T-TD-E be substituted directly with newer-generation transistors from other manufacturers without modifying the existing circuit topology, particularly in legacy industrial automation systems?
Direct substitution is feasible only if the replacement maintains equivalent pinout, voltage/current ratings, and switching speed characteristics. For example, using a contemporary transistor like the 2SC4542 with slightly higher h_FE and lower saturation voltage (V_CE(sat) ≈ 0.6V vs. ~1.8V) would improve efficiency and reduce heating, allowing even better thermal margins. However, differences in package size or lead spacing might require minor mechanical adjustments. More critically, older designs often assume specific turn-off times; faster-switching replacements could introduce ringing or EMI issues unless compensated with adjusted snubber networks. Therefore, while functional replacement is possible, optimal integration may require iterative validation rather than one-for-one swaps.
Why would an engineer choose the 2SC4520T-TD-E over surface-mount alternatives like the 2SC4520R in automotive audio amplifier stages, despite the latter’s smaller footprint and lower parasitic inductance?
The through-hole 2SC4520T-TD-E remains advantageous in high-reliability, repairable systems where manual rework capability and robust solder joints are prioritized over board space. In automotive environments subject to vibration and thermal cycling, the larger package provides mechanical stability and easier inspection during maintenance. Additionally, some legacy test fixtures and hand-soldering stations lack compatibility with fine-pitch SMD components. While the 2SC4520R offers superior high-frequency performance due to reduced lead inductance, the 2SC4520T-TD-E’s availability in bulk packaging and proven track record in analog signal path buffering justify its continued use where cost-per-unit and serviceability outweigh miniaturization benefits.
How does the lack of RoHS compliance in the 2SC4520T-TD-E impact procurement decisions for EU-based manufacturers, and what are the implications for end-of-life product certification?
Since the 2SC4520T-TD-E is not RoHS compliant, it cannot be legally sold into markets requiring compliance with Directive 2011/65/EU unless exempted under specific clauses (e.g., national security exemptions). This restricts adoption in consumer electronics and medical devices manufactured after July 2006. For industrial equipment with extended lifecycles, however, many OEMs accept non-compliant parts if documented as “legacy use” or embedded within systems already certified. Procurement teams must verify whether their supply chain permits handling of restricted substances and ensure proper labeling per REACH guidelines. Failure to do so risks regulatory fines and recalls, especially during audits by notified bodies.
What are the switching speed limitations of the 2SC4520T-TD-E, and how might they constrain its application in PWM-driven LED drivers operating above 100 kHz?
Although not explicitly stated in the datasheet, typical bipolar transistors like the 2SC4520T-TD-E exhibit storage time delays on the order of hundreds of nanoseconds due to minority carrier recombination in the base region. At 100 kHz PWM frequency, this results in significant dead time relative to the period (10 µs), reducing effective duty cycle and increasing average power loss. Furthermore, turn-off delays can cause shoot-through if complementary devices are also present. For LED driver applications demanding precise brightness control and minimal flicker, this makes the 2SC4520T-TD-E suboptimal compared to fast-switching IGBTs or power MOSFETs. A practical workaround involves lowering the PWM frequency to below 10 kHz or using external clamping circuits to accelerate turn-off.
Given the unspecified transition frequency (f_T) and noise figure of the 2SC4520T-TD-E, can it reliably amplify weak sensor signals in precision instrumentation amplifiers?
No, the 2SC4520T-TD-E is fundamentally unsuited for precision amplification tasks requiring low input-referred noise and high linearity. Its f_T is likely below 10 MHz, and base-width modulation effects degrade gain stability across temperature. In instrumentation front ends where gain accuracy exceeds ±1%, even small variations in h_FE with temperature render the device unreliable. Instead, instrumentation-grade designs employ matched JFET-input op-amps or discrete differential pairs using low-noise bipolar transistors with well-defined noise parameters. Using the 2SC4520T-TD-E here introduces unpredictable offset drift and harmonic distortion, compromising measurement integrity—particularly problematic in bridge sensors or thermocouple interfaces.
How should the Moisture Sensitivity Level (MSL) classification of MSL 1 for the 2SC4520T-TD-E affect storage and handling procedures in high-humidity manufacturing facilities?
Classified as MSL 1, the 2SC4520T-TD-E has unlimited floor life when stored properly, meaning it can remain unopened indefinitely in standard dry cabinets without baking before assembly. This simplifies logistics for bulk-packaged inventory, as humidity-induced popcorning during reflow is virtually absent. Nevertheless, best practices recommend storing components in sealed bags with desiccant and humidity indicator cards to prevent condensation during environmental transitions. Facilities operating in tropical climates (>60% RH) should still monitor storage conditions monthly to avoid accidental exposure, though the risk remains negligible compared to higher-MSL devices requiring strict FIFO rotation and nitrogen purge during handling.

Parts with Similar Specifications

The three parts on the right have similar specifications to onsemi 2SC4520T-TD-E

Product Attribute 2SC4521T-TD-E-SY 2SC4521T-TD-E 2SC4520S-TD-E 2SC4521S-TD-E
Part Number 2SC4521T-TD-E-SY 2SC4521T-TD-E 2SC4520S-TD-E 2SC4521S-TD-E
Manufacturer Sanyo onsemi onsemi onsemi
Series - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)

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Evaluation: 10 Articles

  • Nord***mbedded
    Jul 20, 2026

    Reliable FPGA with predictable behavior. Configuration and testing went smoothly, making development faster than expected.

  • Arch***ct
    Jul 15, 2026

    Used this device in a communication signal processing board. Stable timing and no unexpected issues during implementation.

  • FPGA***lorer88
    Jul 7, 2026

    The FPGA works properly and all functions operate as expected. Documentation required some additional research, but overall it is a usable device for smaller signal processing projects.

  • Nath***oleman
    Jun 29, 2026

    Used this sensor component in an industrial automation setup. Detection accuracy was consistent and installation was straightforward.

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • 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.

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onsemi

2SC4520T-TD-E

onsemi
32D-2SC4520T-TD-E

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