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HomeProductsDiscrete Semiconductor ProductsDiodes - Zener - SingleTLZ20B-GS08
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TLZ20B-GS08 - Vishay General Semiconductor - Diodes Division

Manufacturer Part Number
TLZ20B-GS08
Manufacturer
Vishay General Semiconductor – Diodes Division
Allelco Part Number
32D-TLZ20B-GS08
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
885,900 pcs available, New & Original
Parts Description
DIODE ZENER 20V 500MW SOD80
Package
SOD-80 MiniMELF
Data sheet
TLZ20B-GS08.pdf

Datasheets

TLZ Series.pdf

PCN Assembly/Origin

Wafer Source 12/Nov/2021.pdf
RoHs Status
ROHS3 Compliant
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In stock: 885900

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Specifications

TLZ20B-GS08 Tech Specifications
Vishay General Semiconductor - Diodes Division - TLZ20B-GS08 technical specifications, attributes, parameters and parts with similar specifications to Vishay General Semiconductor - Diodes Division - TLZ20B-GS08

Product Attribute Attribute Value
Manufacturer Vishay General Semiconductor – Diodes Division
Voltage - Zener (Nom) (Vz) 20 V
Voltage - Forward (Vf) (Max) @ If 1.5 V @ 200 mA
Tolerance -
Supplier Device Package SOD-80 MiniMELF
Series TLZ
Power - Max 500 mW
Product Attribute Attribute Value
Package / Case DO-213AC, MINI-MELF, SOD-80
Package Tape & Reel (TR)
Operating Temperature -65°C ~ 175°C
Mounting Type Surface Mount
Impedance (Max) (Zzt) 28 Ohms
Current - Reverse Leakage @ Vr 40 nA @ 17.7 V
Base Product Number TLZ20

Environmental & Export Classifications

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

Frequently Asked Questions(FAQ)

What is the maximum power dissipation and how does it affect thermal management for the TLZ20B-GS08 Zener diode in high-ambient temperature environments?
The TLZ20B-GS08 dissipates up to 500 mW under specified conditions, which imposes a critical constraint on continuous operation near its rated limits. In applications operating close to 20 V zener regulation with substantial load currents, localized heating can significantly reduce reliability. Thermal derating must be applied based on the SOD-80 MiniMELF package’s limited junction-to-air thermal resistance. Designers should ensure adequate copper area or airflow when operating above 300 mW average dissipation, especially in sealed or crowded PCBs where ambient temperatures exceed 60°C. Failure to account for self-heating may accelerate electromigration or cause parametric drift in breakdown voltage due to elevated junction temperatures.
How does the TLZ20B-GS08 compare to other 20V Zener diodes such as the BZX79-C20 or 1N4746A in terms of dynamic impedance and transient response?
The TLZ20B-GS08 has a typical zener impedance (Zzt) of 28 ohms at test current, which places it between precision regulators and standard clamping devices. Compared to through-hole equivalents like the 1N4746A—which often exhibit Zzt values exceeding 100 ohms—the TLZ20B-GS08 offers superior line and load regulation due to lower incremental resistance. However, it is less ideal than ultra-low-impedance variants such as certain TVS-based Zeners optimized for fast transients. For circuits requiring tight output stability under varying loads, the TLZ20B-GS08 provides better performance than older glass-packaged Zeners but may still require external filtering if used in sensitive analog reference paths where noise sensitivity is paramount.
Can the TLZ20B-GS08 be safely used in reverse-bias configurations without additional protection circuitry?
Yes, the TLZ20B-GS08 is specifically designed for reverse-bias operation below its nominal zener voltage of 20 V. When forward-biased, it behaves as a conventional diode with a Vf of approximately 1.5 V at 200 mA. This means that if accidentally connected in forward mode across a supply rail, it will not conduct until that threshold is exceeded. While this prevents catastrophic failure from polarity reversal, it also implies that unintended conduction could occur in low-voltage forward paths if not properly isolated. Therefore, while the device tolerates incorrect orientation, system-level design must still include safeguards against overcurrent during accidental forward biasing to avoid nuisance tripping or localized heating.
What are the implications of the TLZ20B-GS08’s -65°C to +175°C operating range for automotive-grade applications?
The TLZ20B-GS08 supports full industrial temperature grading from -65°C to +175°C, making it suitable for harsh environments including automotive under-the-hood systems. Unlike many commercial-grade Zeners limited to +125°C, this extended range ensures functionality in direct-exposure zones where thermal cycling and heat soak are common. The package’s hermetic seal (SOD-80 MiniMELF) resists moisture ingress better than exposed leads, aligning with MSL 1 requirements. However, even within this range, long-term reliability depends on avoiding sustained operation near maximum power dissipation at high ambient temperatures. In engine control units or lighting ballasts, proper PCB layout and thermal relief remain essential to exploit the full operational envelope without compromising mean time between failures.
Why might someone choose the TLZ20B-GS08 over a surface-mount TVS diode for overvoltage protection in a cost-sensitive digital circuit?
The TLZ20B-GS08 offers precise 20 V breakdown with moderate surge capability, whereas most TVS diodes prioritize energy absorption over voltage accuracy. In digital logic circuits where input voltages must stay tightly bounded (e.g., 3.3 V microcontroller inputs protected via resistive divider), using a Zener like the TLZ20B-GS08 allows tighter clamping than generic TVS devices whose breakdown tolerances (±5–10%) may allow undershoot beyond safe levels. Additionally, the TLZ20B-GS08 consumes less quiescent current and generates less parasitic capacitance than typical bidirectional TVS arrays. This makes it preferable in low-power, high-impedance signal lines where leakage and capacitance would otherwise distort signals.
How does the TLZ20B-GS08’s reverse leakage current of 40 nA at 17.7 V impact battery-powered IoT sensor nodes?
At 17.7 V, the TLZ20B-GS08 exhibits only 40 nA of reverse leakage—well below the microamp range typical of older Zener types. In battery-powered IoT nodes powered by 12 V or 15 V rails, this minimal leakage minimizes standby drain on primary cells or supercapacitors. Over a year-long deployment, 40 nA translates to approximately 0.35 mAh of charge loss—negligible compared to sleep-mode MCU consumption. Furthermore, the absence of significant off-state current reduces noise coupling into analog front ends and avoids unnecessary power conversion inefficiencies. Thus, the TLZ20B-GS08 contributes favorably to overall system efficiency in remote monitoring applications where energy harvesting or coin-cell longevity is critical.
Is the TLZ20B-GS08 suitable for use in switching power supplies as a secondary feedback clamp?
While possible, the TLZ20B-GS08 is not ideal for primary regulation in switching supplies due to its relatively high Zzt of 28 ohms and lack of built-in soft-start behavior. It can serve as an auxiliary overvoltage clamp if placed across the feedback pin or output to limit excursions during startup transients. In such roles, its fast turn-on characteristic and stable Vz help protect downstream ICs from latch-up. However, relying solely on the TLZ20B-GS08 for output stabilization risks poor load regulation and thermal runaway if subjected to repeated high-current pulses beyond its 500 mW rating. For robust SMPS designs, dedicated controller ICs with integrated protection are preferred, with the TLZ20B-GS08 used only as a supplemental safeguard.
How does the TLZ20B-GS08 perform in high-vibration environments commonly found in aerospace or industrial machinery?
The SOD-80 MiniMELF package used by the TLZ20B-GS08 features solder joints that are more resilient to mechanical stress than smaller SMD packages like SOT-23 or chip-scale types. Its DO-213AC footprint provides sufficient attachment strength under vibration, and Vishay’s manufacturing process includes reliability testing per JEDEC standards for shock and vibration. Combined with RoHS3 compliance and full lead-free reflow compatibility, the TLZ20B-GS08 meets requirements for mission-critical assemblies. Nevertheless, designers should still follow IPC Class 3 guidelines for land patterns and consider conformal coating to prevent solder fatigue at extreme temperatures. Proper placement away from rotating components further enhances robustness in demanding physical environments.

Parts with Similar Specifications

The three parts on the right have similar specifications to Vishay General Semiconductor - Diodes Division TLZ20B-GS08

Product Attribute TLZ20-GS08 TLZ20A-GS08 TLZ20B-GS18 TLZ20C-GS08
Part Number TLZ20-GS08 TLZ20A-GS08 TLZ20B-GS18 TLZ20C-GS08
Manufacturer Vishay General Semiconductor - Diodes Division Vishay General Semiconductor - Diodes Division Vishay General Semiconductor - Diodes Division Vishay General Semiconductor - Diodes Division
Voltage - Zener (Nom) (Vz) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Voltage - Forward (Vf) (Max) @ If - - - -
Power - Max - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Series - - - -
Impedance (Max) (Zzt) - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Mounting Type - Surface Mount Through Hole Surface Mount
Current - Reverse Leakage @ Vr - - - -
Tolerance - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42

TLZ20B-GS08 Datasheet PDF

Download TLZ20B-GS08 pdf datasheets and Vishay General Semiconductor - Diodes Division documentation for TLZ20B-GS08 - Vishay General Semiconductor - Diodes Division.

Datasheets
TLZ Series.pdf
PCN Assembly/Origin
Wafer Source 12/Nov/2021.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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TLZ20B-GS08 Image

TLZ20B-GS08

Vishay General Semiconductor - Diodes Division
32D-TLZ20B-GS08

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