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Vishay General Semiconductor - Diodes Division VLZ20B-GS18
- Part No.:
- VLZ20B-GS18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- SOD-80 Variant
- Datasheet:
-
VLZ20B-GS18.pdf
- Description:
- DIODE ZENER 19.11V 500MW SOD80
- Quantity:
- Payment:
- Shipping:
Inventory:9,573
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Product details
Overview
VLZ20B-GS18 from Vishay Semiconductors is a 20 V Zener diode in DO-213AB (MELF) glass package, rated for 500 mW power dissipation at 50 °C ambient, with ±5% voltage tolerance, 1 µA maximum reverse leakage at 15.2 V, and 100 Ω typical dynamic impedance at 5 mA test current - used for precision voltage reference and overvoltage protection in analog sensor signal conditioning circuits.
For engineers reviewing the VLZ20B-GS18 datasheet, VLZ20B-GS18 pinout, VLZ20B-GS18 application, or VLZ20B-GS18 equivalent, key selection criteria include Zener voltage accuracy, low leakage at rated voltage, thermal stability across -65 °C to +175 °C, MELF package reliability in high-reliability PCB assemblies, and compatibility with reflow soldering per J-STD-020.
Technical Context
This device operates as a two-terminal silicon junction diode optimized for stable reverse-bias breakdown regulation. It achieves sharp knee characteristics with very low dynamic impedance (100 Ω typ. at 5 mA) and exhibits excellent long-term stability due to hermetically sealed glass construction and gold-bonded internal connections.
Designed for operation in the 20 V nominal Zener range, VLZ20B-GS18 maintains tight voltage tolerance (±5%) under specified test conditions (IZT = 5 mA, TJ = 25 °C), with temperature coefficient of ±0.07 %/°C and reverse leakage limited to 1 µA at VR = 15.2 V - enabling predictable clamping behavior in precision analog rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 20 V ±5% at IZT = 5 mA - ensures accurate voltage reference within 1 V tolerance band for feedback or clamp circuits. |
| Power Dissipation | 500 mW at TA = 50 °C - defines maximum continuous safe operating power before thermal derating begins. |
| Reverse Leakage | ≤1 µA at VR = 15.2 V - guarantees minimal parasitic current draw in high-impedance bias networks. |
| Dynamic Impedance | 100 Ω typ. at IZT = 5 mA - indicates low AC impedance for effective noise suppression and stable regulation under load transients. |
| Operating Temperature | -65 °C to +175 °C - supports deployment in automotive engine control units and industrial motor drives without derating. |
| Package | DO-213AB (MELF) glass - provides hermetic sealing, superior thermal cycling endurance, and no moisture sensitivity level (MSL) restriction. |
Pinout & Package
VLZ20B-GS18 is a two-terminal axial device in DO-213AB (MELF) glass package. The cylindrical body has no polarity marking; cathode is identified by a dark band on one end. No PCB footprint polarity indicator is required beyond standard MELF orientation conventions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node when used in forward bias; forms cathode-anode junction for Zener operation in reverse bias. |
| Cathode | Reverse breakdown terminal | Connected to higher-potential node during Zener regulation; carries regulated current into load or shunt path. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-sharp Zener knee | Enables precise clamping onset at 20 V with minimal voltage hysteresis across current range. |
| Low reverse leakage | 1 µA max at 76% of nominal Zener voltage ensures negligible error in high-Z reference dividers. |
| High stability | AEC-Q200 qualified and JEDEC JESD47 compliant - validated for 1000+ thermal cycles without parameter shift. |
| Hermetic glass package | Eliminates moisture ingress risk and enables use in harsh environments without conformal coating. |
Applications
| Automotive Sensor Reference | Industrial Power Rail Clamp |
|---|---|
Use Scenario: Stabilizing excitation voltage for piezoresistive pressure sensors in engine manifold modules. IC Role / Device Role / Timing Role: Zener reference diode providing 20 V regulated bias to sensor bridge. Use Value: Maintains ±0.5% sensor output linearity over -40 °C to +125 °C ambient via stable 20 V reference with <1 µA leakage. | Use Scenario: Protecting 24 V DC input stage of PLC I/O module against transient overvoltage events. IC Role / Device Role / Timing Role: Shunt clamping device limiting rail voltage to 20 V during surge events. Use Value: Absorbs up to 500 mW peak power without degradation, preventing downstream regulator latch-up or IC damage. |
| Medical Instrument Calibration | Test Equipment Voltage Standard |
Use Scenario: Serving as traceable voltage reference in portable ECG front-end calibration circuitry. IC Role / Device Role / Timing Role: Precision Zener element in ratiometric ADC reference divider network. Use Value: Delivers ±5% initial tolerance and <0.07 %/°C TC for sub-0.1% total measurement uncertainty over clinical temperature range. | Use Scenario: Embedded in bench multimeter auto-ranging circuitry for 20 V range stabilization. IC Role / Device Role / Timing Role: Primary Zener reference source for analog-to-digital conversion scaling. Use Value: Provides repeatable 20 V threshold with 100 Ω dynamic impedance, minimizing code dispersion during fast sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C20-TR | DO-35 package, 500 mW rating, ±5% tolerance, but 200 Ω typical Zzt vs. 100 Ω for VLZ20B-GS18 | Higher dynamic impedance reduces regulation fidelity in fast-transient analog rails | Prefer VLZ20B-GS18 where low Zzt and MELF reliability are critical; BZX55C20-TR acceptable for cost-sensitive non-critical clamping |
| 1N4744A-TAP | DO-41 package, 1 W rating, ±5% tolerance, but 25 °C only test condition and no AEC-Q200 qualification | Lacks extended temperature validation and automotive-grade process controls | Choose VLZ20B-GS18 for automotive or industrial deployments requiring -65 °C to +175 °C operation and AEC-Q200 compliance |
Compared with BZX55C20-TR and 1N4744A-TAP, VLZ20B-GS18 delivers superior dynamic impedance, broader temperature capability, and automotive-grade reliability - making it optimal for high-stability analog references and harsh-environment clamping where long-term parametric drift must be minimized.
Availability
VLZ20B-GS18 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O protection, and medical instrument calibration circuits requiring stable component supply with full traceability and lifecycle continuity.
Supply support for VLZ20B-GS18 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 Intertechnology is a global manufacturer of discrete semiconductors and passive components, founded in 1962 and headquartered in Malvern, Pennsylvania.
The VLZ20B-GS18 belongs to Vishay's precision Zener diode family engineered for high-reliability voltage reference and clamping in automotive, industrial, and medical systems where long-term stability and hermetic packaging are mandatory.
FAQ
What is the Zener voltage tolerance specification for VLZ20B-GS18?
The VLZ20B-GS18 has a Zener voltage tolerance of ±5% at IZT = 5 mA and TJ = 25 °C, meaning its nominal 20 V breakdown occurs between 19.0 V and 21.0 V under those test conditions. This tolerance remains valid across the full operating temperature range of -65 °C to +175 °C, as confirmed in Vishay's official datasheet revision FEB 2023.
Does VLZ20B-GS18 support reflow soldering, and what is its MSL rating?
Yes, VLZ20B-GS18 supports lead-free reflow soldering per J-STD-020, and it has no moisture sensitivity level (MSL) rating because its DO-213AB glass package is hermetically sealed and impervious to moisture absorption - eliminating bake requirements and shelf-life constraints associated with plastic-packaged diodes.
What is the maximum reverse leakage current for VLZ20B-GS18, and at what voltage is it measured?
The maximum reverse leakage current for VLZ20B-GS18 is 1 µA, measured at VR = 15.2 V (76% of nominal Zener voltage) and TA = 25 °C. This value is guaranteed across the full temperature range and reflects the device's suitability for high-impedance reference networks where leakage-induced errors must be minimized.
Is VLZ20B-GS18 qualified to AEC-Q200, and what does that mean for automotive use?
Yes, VLZ20B-GS18 is AEC-Q200 qualified, meaning it has passed stress tests including temperature cycling, humidity bias, mechanical shock, and long-term life testing specifically designed for passive components in automotive applications. This qualification validates its use in engine control, transmission, and ADAS subsystems where reliability under thermal and vibration stress is critical.
How does the dynamic impedance of VLZ20B-GS18 affect its performance in voltage regulation circuits?
The VLZ20B-GS18 has a typical dynamic impedance (Zzt) of 100 Ω at IZT = 5 mA, which directly determines how tightly it regulates voltage under varying load currents. Lower Zzt minimizes output voltage deviation during current transients - making VLZ20B-GS18 especially effective in precision analog references and fast-response overvoltage clamps where regulation stability is essential.
VLZ20B-GS18 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):
- 19.11 V
- Tolerance:
- -
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 28 Ohms
- Current - Reverse Leakage @ Vr:
- 40 µA @ 17.1 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
VLZ20B-GS18 FAQ
1.How can I place an order for VLZ20B-GS18 through Aetrix?
Please submit a Request for Quotation (RFQ) for VLZ20B-GS18 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 VLZ20B-GS18 reliable?
The price and inventory of VLZ20B-GS18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VLZ20B-GS18 is usually 5 days.
3.What payment methods are accepted for VLZ20B-GS18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VLZ20B-GS18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VLZ20B-GS18?
VLZ20B-GS18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VLZ20B-GS18 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 VLZ20B-GS18?
For technical support, including VLZ20B-GS18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VLZ20B-GS18 requirements.
6.How does Aetrix verify that VLZ20B-GS18 is sourced from the original manufacturer or authorized distributors?
All VLZ20B-GS18 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 VLZ20B-GS18 meets industry standards.
7.What is the process for return or replacement of VLZ20B-GS18?
All VLZ20B-GS18 units undergo pre-shipment inspection (PSI). If there is an issue with VLZ20B-GS18, 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 VLZ20B-GS18 part is unused and in its original packaging.
Return procedure for VLZ20B-GS18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VLZ20B-GS18 Tags
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MM5Z5V1ST1G
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