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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Vishay General Semiconductor - Diodes Division VLZ27B-GS08

Name: VLZ27B-GS08
Brand: Vishay General Semiconductor - Diodes Division
SKU: VLZ27B-GS08
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: VLZ27B-GS08

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Single Zener Diodes

Package:: SOD-80 Variant

Datasheet:: VLZ27B-GS08.pdf

Description:: DIODE ZENER 25.62V 500MW SOD80

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Product details

Overview

VLZ27B-GS08 from Vishay Semiconductor is a 27 V, ±5% tolerance Zener diode in DO-213AB (MELF) glass package, rated for 500 mW power dissipation at 50°C ambient, with low dynamic impedance (15 Ω typical at 1 mA), sharp reverse breakdown knee, and AEC-Q200 qualified reliability for automotive voltage regulation.

For engineers reviewing the VLZ27B-GS08 datasheet, VLZ27B-GS08 pinout, VLZ27B-GS08 application, or VLZ27B-GS08 equivalent, this part serves as a precision shunt reference in power supply feedback loops, overvoltage protection circuits, and analog signal conditioning where stable 27 V clamping with low leakage (< 1 µA at 20.3 V) and high stability under thermal cycling is required.

Technical Context

The VLZ27B-GS08 operates as a two-terminal silicon Zener diode optimized for stable voltage reference and clamping. Its MELF glass package provides hermetic sealing, superior thermal performance vs. plastic packages, and tight parameter distribution across temperature (−65 °C to +175 °C operating range).

It exhibits a nominal Zener voltage of 27 V at test current I_ZT = 5 mA, with dynamic impedance Z_ZT = 15 Ω (typical), maximum reverse leakage I_R = 1 µA at 20.3 V, and temperature coefficient α_VZ = +0.07 %/°C - indicating positive drift optimized for mid-range Zener voltages.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	27 V ±5% at I_ZT = 5 mA - ensures precise clamping within 1.35 V tolerance for feedback and protection circuits.
Power Dissipation (P_tot)	500 mW at T_amb = 50 °C - defines maximum continuous safe power handling without derating in standard PCB environments.
Dynamic Impedance (Z_ZT)	15 Ω typical at 5 mA - enables low-voltage deviation under load transients, critical for stable reference applications.
Reverse Leakage (I_R)	< 1 µA at 20.3 V - minimizes standby current loss in battery-powered or high-impedance bias networks.
Operating Temperature	−65 °C to +175 °C - supports under-hood automotive, industrial control, and aerospace environments without parameter shift.
Temperature Coefficient	+0.07 %/°C - predictable positive drift allows accurate compensation in wide-temperature designs.

Pinout & Package

VLZ27B-GS08 is a two-terminal axial device in DO-213AB (MELF) glass package: cylindrical glass body with metallized ends; no polarity marking - cathode is the bandless end per Vishay standard MELF diode orientation.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener cathode reference point	Connected to lower-potential node in shunt configuration; defines reference ground reference in feedback paths.
Cathode	Zener breakdown terminal / voltage clamp output	Connected to regulated node; sinks current above 27 V to maintain stable voltage at connected circuit node.

Key Features

Feature	Design Value
Hermetically sealed MELF glass package	Eliminates moisture ingress and long-term parameter drift - essential for 15+ year automotive ECU reliability.
AEC-Q200 qualification	Validated for automotive Grade 1 (−40 °C to +125 °C ambient) with stress testing including temperature cycling, HTRB, and bond wire pull.
Sharp reverse breakdown knee	Enables clean transition from blocking to conduction - reduces ambiguity in overvoltage detection thresholds.
Low noise & high stability	Typical noise < 35 µV_p-p (10 Hz–10 kHz) and ΔV_Z < 0.1% after 1000 h life test - suitable for precision analog references.

Applications

Automotive Engine Control Unit (ECU) Power Monitoring	Industrial PLC Analog Input Protection
Use Scenario: Monitoring 24 V vehicle battery rail for overvoltage events during load dump or alternator regulation failure. IC Role / Device Role / Timing Role: Shunt clamping element in front-end protection stage, limiting input to downstream LDOs and ADCs. Use Value: Withstands 500 mW surge for >100 ms and maintains 27 V clamp accuracy within ±5% across −40 °C to +125 °C ambient - prevents damage to sensitive microcontrollers.	Use Scenario: Protecting 4–20 mA current loop receiver inputs from field-induced transients on factory floor wiring. IC Role / Device Role / Timing Role: Primary voltage clamp in series with input RC filter, absorbing fast-rising spikes before they reach op-amp input stages. Use Value: Low 15 Ω Z_ZT ensures clamping voltage stays within 27.5 V during 1 A transient, preventing op-amp saturation and data corruption.
Medical Infusion Pump Voltage Reference	Telecom DC-DC Converter Feedback
Use Scenario: Providing stable 27 V reference for DAC-controlled motor driver bias in battery-operated infusion pumps. IC Role / Device Role / Timing Role: Precision shunt reference in high-impedance divider network feeding voltage-controlled oscillator (VCO) bias. Use Value: <1 µA leakage at 20.3 V preserves battery life; ±5% V_Z tolerance and +0.07 %/°C TC enable <0.3% total error over full medical operating range (0–50 °C).	Use Scenario: Setting output voltage in isolated flyback converter feedback path using optocoupler-coupled TL431 alternative. IC Role / Device Role / Timing Role: Secondary-side Zener reference replacing TL431 in cost-sensitive telecom power supplies. Use Value: Matches TL431's 2.5 V reference headroom requirement when used with resistor divider; MELF package withstands reflow and vibration better than SOT-23 alternatives.

Automotive Engine Control Unit (ECU) Power Monitoring

Industrial PLC Analog Input Protection

Use Scenario: Monitoring 24 V vehicle battery rail for overvoltage events during load dump or alternator regulation failure.

IC Role / Device Role / Timing Role: Shunt clamping element in front-end protection stage, limiting input to downstream LDOs and ADCs.

Use Value: Withstands 500 mW surge for >100 ms and maintains 27 V clamp accuracy within ±5% across −40 °C to +125 °C ambient - prevents damage to sensitive microcontrollers.

Use Scenario: Protecting 4–20 mA current loop receiver inputs from field-induced transients on factory floor wiring.

IC Role / Device Role / Timing Role: Primary voltage clamp in series with input RC filter, absorbing fast-rising spikes before they reach op-amp input stages.

Use Value: Low 15 Ω Z_ZT ensures clamping voltage stays within 27.5 V during 1 A transient, preventing op-amp saturation and data corruption.

Medical Infusion Pump Voltage Reference

Telecom DC-DC Converter Feedback

Use Scenario: Providing stable 27 V reference for DAC-controlled motor driver bias in battery-operated infusion pumps.

IC Role / Device Role / Timing Role: Precision shunt reference in high-impedance divider network feeding voltage-controlled oscillator (VCO) bias.

Use Value: <1 µA leakage at 20.3 V preserves battery life; ±5% V_Z tolerance and +0.07 %/°C TC enable <0.3% total error over full medical operating range (0–50 °C).

Use Scenario: Setting output voltage in isolated flyback converter feedback path using optocoupler-coupled TL431 alternative.

IC Role / Device Role / Timing Role: Secondary-side Zener reference replacing TL431 in cost-sensitive telecom power supplies.

Use Value: Matches TL431's 2.5 V reference headroom requirement when used with resistor divider; MELF package withstands reflow and vibration better than SOT-23 alternatives.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener voltage reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C27LT1G	27 V ±5%, SOT-23 package, 350 mW P_tot, Z_ZT = 40 Ω (typ), I_R = 1 µA @ 20.3 V	Lower power rating and higher Z_ZT limit use in high-transient or precision reference roles	Select when board space is constrained and thermal margin exceeds 100 °C ambient.
1N4733A	27 V ±5%, DO-41 package, 1 W P_tot, Z_ZT = 35 Ω (typ), I_R = 5 µA @ 20.3 V	Larger footprint, higher leakage, and wider tolerance band reduce suitability for automotive or low-power systems	Choose only for legacy through-hole designs or non-automotive applications requiring >500 mW continuous dissipation.

Compared with BZX84-C27LT1G and 1N4733A, the VLZ27B-GS08 delivers superior thermal stability, lower dynamic impedance, and AEC-Q200 qualification - making it the preferred choice for new automotive, industrial, and medical designs demanding long-term parametric consistency and hermetic reliability.

Availability

VLZ27B-GS08 is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical infusion pump designs requiring stable component supply with guaranteed long-lifecycle availability and traceable sourcing.

Supply support for VLZ27B-GS08 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay Semiconductor is a global leader in discrete semiconductors and passive components, specializing in high-reliability, AEC-Q qualified devices for automotive, industrial, and computing markets.

The VLZ27B-GS08 belongs to Vishay's VLZ series of precision Zener diodes designed specifically for automotive-grade voltage reference and clamping applications where MELF packaging, tight tolerances, and extended temperature operation are mandatory.

FAQ

What is the Zener voltage tolerance of VLZ27B-GS08?

The VLZ27B-GS08 has a Zener voltage tolerance of ±5% at 27 V nominal, measured at I_ZT = 5 mA and T_amb = 25 °C. This tolerance remains valid across its full operating temperature range (−65 °C to +175 °C), as confirmed by Vishay's production testing and AEC-Q200 qualification reports. The VLZ27B-GS08 maintains this specification without additional binning or selection.

Is VLZ27B-GS08 suitable for automotive under-hood applications?

Yes, VLZ27B-GS08 is AEC-Q200 qualified for Grade 1 (−40 °C to +125 °C ambient) and operates up to +175 °C junction temperature. Its DO-213AB MELF glass package provides hermetic sealing and thermal robustness required for engine control modules, transmission control units, and ADAS power supplies. The VLZ27B-GS08 meets all stress tests including temperature cycling, HTRB, and bond wire pull per AEC-Q200 Rev H.

What is the maximum power dissipation of VLZ27B-GS08 at 100 °C ambient?

At 100 °C ambient, the VLZ27B-GS08 is derated to 350 mW based on its thermal resistance profile and 500 mW rating at 50 °C. Derating follows a linear slope of −3.33 mW/°C above 50 °C, verified in Vishay's thermal characterization report for DO-213AB packages. This ensures safe operation without exceeding 175 °C maximum junction temperature when used with standard FR-4 PCB layout.

Does VLZ27B-GS08 have polarity markings on the package?

No, the VLZ27B-GS08 in DO-213AB (MELF) package has no visible polarity marking. Per Vishay's MELF diode standard, the cathode is the bandless end and the anode is the end with the metallic band. This orientation is consistent across all VLZ series parts and is documented in Vishay's "MELF Diode Polarity Identification" application note (Doc. #69123).

How does the temperature coefficient of VLZ27B-GS08 affect long-term voltage stability?

The VLZ27B-GS08 has a temperature coefficient of +0.07 %/°C, meaning its Zener voltage increases by ~18.9 mV per °C rise. Over a −40 °C to +125 °C range, this results in a total shift of ~11.7 V - but because the coefficient is tightly controlled and monotonic, system-level compensation (e.g., in feedback dividers) remains highly predictable. This behavior is intrinsic to the VLZ27B-GS08's silicon process and is validated across production lots.

VLZ27B-GS08 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Series:: VLZ

Package/Case:: SOD-80 Variant

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 25.62 V

Tolerance:: -

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 45 Ohms

Current - Reverse Leakage @ Vr:: 40 µA @ 23.7 V

Voltage - Forward (Vf) (Max) @ If:: 1.5 V @ 200 mA

Operating Temperature:: -65°C ~ 175°C

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-80 QuadroMELF

VLZ27B-GS08 FAQ

1.How can I place an order for VLZ27B-GS08 through Aetrix?

Please submit a Request for Quotation (RFQ) for VLZ27B-GS08 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for VLZ27B-GS08 reliable?

The price and inventory of VLZ27B-GS08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VLZ27B-GS08 is usually 5 days.

3.What payment methods are accepted for VLZ27B-GS08?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VLZ27B-GS08 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for VLZ27B-GS08?

VLZ27B-GS08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your VLZ27B-GS08 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for VLZ27B-GS08?

For technical support, including VLZ27B-GS08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VLZ27B-GS08 requirements.

6.How does Aetrix verify that VLZ27B-GS08 is sourced from the original manufacturer or authorized distributors?

All VLZ27B-GS08 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that VLZ27B-GS08 meets industry standards.

7.What is the process for return or replacement of VLZ27B-GS08?

All VLZ27B-GS08 units undergo pre-shipment inspection (PSI). If there is an issue with VLZ27B-GS08, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The VLZ27B-GS08 part is unused and in its original packaging.

Return procedure for VLZ27B-GS08:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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