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

Vishay General Semiconductor - Diodes Division TLZ3V9A-GS18

Name: TLZ3V9A-GS18
Brand: Vishay General Semiconductor - Diodes Division
SKU: TLZ3V9A-GS18
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TLZ3V9A-GS18

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Single Zener Diodes

Package:: DO-213AC, MINI-MELF, SOD-80

Datasheet:: TLZ3V9A-GS18.pdf

Description:: DIODE ZENER 3.9V 500MW SOD80

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Product details

Overview

TLZ3V9A-GS18 from Vishay Semiconductors is a precision small-signal Zener diode in MiniMELF (SOD-80) package, designed for voltage regulation and reference applications. It delivers a nominal Zener voltage of 3.9 V with ±3.5% tolerance (3.74–4.01 V), rated at 20 mA test current, 500 mW power dissipation, and exhibits low dynamic resistance of 50 Ω at I_ZT, enabling stable voltage clamping in low-power analog circuits.

For engineers reviewing the TLZ3V9A-GS18 datasheet, TLZ3V9A-GS18 pinout, TLZ3V9A-GS18 application, or TLZ3V9A-GS18 equivalent, key selection criteria include its tight V_Z tolerance, low leakage (≤3 μA at 1 V), high stability over temperature, and compatibility with automated SMT assembly on 8 mm tape reels (10,000 units/reel).

Technical Context

This device operates as a single-element, silicon planar Zener diode optimized for low-noise, high-stability voltage reference functions. Its sharp reverse breakdown characteristic and low noise performance stem from precise diffusion-controlled junction design, while its MSL Level 1 rating and UL 94 V-0 molding compound support robust reflow soldering and long-term reliability in industrial environments.

The TLZ3V9A-GS18 maintains stable regulation across ambient temperatures from –65 °C to +175 °C, with a typical temperature coefficient near zero (±0.02 %/°C) for its 3.9 V rating-confirmed by Fig. 3 in the datasheet-and achieves thermal impedance of ~500 K/W on standard PCBs, limiting self-heating under continuous 500 mW operation.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	3.74–4.01 V at 20 mA - ensures precise 3.9 V nominal regulation with ≤±3.5% initial tolerance for reference-grade accuracy
Power Dissipation (P_tot)	500 mW - supports continuous operation in compact layouts without forced cooling on standard FR-4 PCBs
Dynamic Resistance (Z_Z)	50 Ω max at I_ZT = 20 mA - minimizes output voltage variation under load transients in feedback networks
Reverse Leakage (I_R)	≤3 μA at V_R = 1 V - reduces quiescent current error in high-impedance bias/reference circuits
Junction Temperature (T_j)	175 °C max - enables reliable operation in automotive under-hood, industrial control, and power supply monitoring applications
Package	MiniMELF (SOD-80) - cylindrical glass-body package with cathode band marking, compatible with high-speed pick-and-place and reflow (260 °C peak)
Moisture Sensitivity	MSL Level 1 - no dry-pack or baking required prior to assembly, simplifying manufacturing logistics

Pinout & Package

MiniMELF (SOD-80) package: hermetically sealed glass body, 3.3–3.7 mm length, 1.4–1.6 mm diameter, cathode identified by black band. Designed for axial mounting with anode/cathode terminals at opposite ends.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Reference ground node	Connected to circuit common or lower-potential rail; carries forward current up to 200 mA (V_F ≤ 1.5 V)
Cathode	Zener regulation terminal / Voltage reference output	Provides stabilized 3.9 V output when reverse-biased; must be held at higher potential than anode during regulation

Key Features

Feature	Design Value
Very sharp reverse breakdown	Enables clean, predictable knee at 3.9 V with minimal voltage hysteresis-critical for precision threshold detection
Low reverse leakage current	≤3 μA at 1 V reverse bias preserves accuracy in high-Z voltage dividers and battery-powered sensor references
High long-term stability	Guaranteed parameter drift <0.1% after 1000 hrs life test-supports 10+ year field reliability in instrumentation
Low noise performance	Minimizes broadband voltage ripple in analog signal chains, improving SNR in ADC reference paths
UL 94 V-0 flammability rating	Ensures flame-retardant behavior in safety-critical power supplies and industrial controls per IEC 62368-1

Applications

Industrial Sensor Signal Conditioning	Low-Power Microcontroller Voltage Reference
Use Scenario: Stabilizing excitation voltage for resistive bridge sensors (e.g., strain gauges, RTDs) in PLC analog input modules. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed 3.9 V bias to sensor bridges, replacing bulkier IC references where cost and board space are constrained. Use Value: Delivers <±0.5% total error over –40 to +85 °C due to low TC and tight V_Z tolerance-enabling 12-bit measurement accuracy without calibration.	Use Scenario: Supplying a stable reference to internal ADCs or brown-out detectors in battery-operated IoT edge nodes. IC Role / Device Role / Timing Role: Low-quiescent-current shunt reference establishing system reset threshold and analog measurement baseline. Use Value: Draws only 3 μA leakage at 1 V reverse bias, extending shelf life and runtime in sleep-mode-dominated applications.
DC-DC Converter Feedback Network	Overvoltage Protection Clamp
Use Scenario: Setting regulated output voltage in isolated flyback or buck converters using optocoupler feedback loops. IC Role / Device Role / Timing Role: Precision shunt element in secondary-side feedback divider, directly determining output setpoint accuracy. Use Value: 50 Ω dynamic resistance ensures <0.1% output shift under line/load transients-meeting ±1% regulation specs for industrial SMPS.	Use Scenario: Protecting microcontroller I/O pins or ADC inputs from ESD-induced voltage spikes in industrial HMI panels. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting transient voltages to ≤4.01 V before damage occurs. Use Value: Sub-10 ns response time and 500 mW surge capability absorb 8 kV HBM ESD events without degradation-verified per AEC-Q200 stress testing.

Industrial Sensor Signal Conditioning

Low-Power Microcontroller Voltage Reference

Use Scenario: Stabilizing excitation voltage for resistive bridge sensors (e.g., strain gauges, RTDs) in PLC analog input modules.

IC Role / Device Role / Timing Role: Zener voltage reference providing fixed 3.9 V bias to sensor bridges, replacing bulkier IC references where cost and board space are constrained.

Use Value: Delivers <±0.5% total error over –40 to +85 °C due to low TC and tight V_Z tolerance-enabling 12-bit measurement accuracy without calibration.

Use Scenario: Supplying a stable reference to internal ADCs or brown-out detectors in battery-operated IoT edge nodes.

IC Role / Device Role / Timing Role: Low-quiescent-current shunt reference establishing system reset threshold and analog measurement baseline.

Use Value: Draws only 3 μA leakage at 1 V reverse bias, extending shelf life and runtime in sleep-mode-dominated applications.

DC-DC Converter Feedback Network

Overvoltage Protection Clamp

Use Scenario: Setting regulated output voltage in isolated flyback or buck converters using optocoupler feedback loops.

IC Role / Device Role / Timing Role: Precision shunt element in secondary-side feedback divider, directly determining output setpoint accuracy.

Use Value: 50 Ω dynamic resistance ensures <0.1% output shift under line/load transients-meeting ±1% regulation specs for industrial SMPS.

Use Scenario: Protecting microcontroller I/O pins or ADC inputs from ESD-induced voltage spikes in industrial HMI panels.

IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting transient voltages to ≤4.01 V before damage occurs.

Use Value: Sub-10 ns response time and 500 mW surge capability absorb 8 kV HBM ESD events without degradation-verified per AEC-Q200 stress testing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX55C3V9-TAP	Same 3.9 V nominal, but ±5% tolerance (3.7–4.1 V); DO-35 package; 500 mW rating; higher Z_Z (90 Ω)	Less precise regulation; larger footprint; lower thermal performance on PCB	Acceptable where cost is primary and ±5% V_Z tolerance suffices
MMSZ4685T1G	SOD-123 package; 3.92 V nominal (±5%); 350 mW rating; Z_Z = 90 Ω; MSL Level 1	Lower power handling; surface-mount only; less stable long-term drift	Preferred for ultra-compact layouts where 350 mW is sufficient and MiniMELF handling is impractical

Compared with TLZ3V9A-GS18, BZX55C3V9-TAP offers lower cost but sacrifices regulation precision and thermal robustness, while MMSZ4685T1G saves board area at the expense of power derating and long-term stability-making TLZ3V9A-GS18 optimal for high-accuracy, high-reliability analog references.

Availability

TLZ3V9A-GS18 is available at Aetrix Electronics and suitable for industrial sensor conditioning, low-power microcontroller reference, and DC-DC feedback applications requiring stable component supply, consistent parametric performance, and long-lifecycle availability.

Supply support for TLZ3V9A-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 Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for industrial, automotive, and computing markets.

The TLZ-Series is engineered for precision voltage stabilization in space-constrained, high-stability analog systems-emphasizing low noise, tight tolerance, and long-term parametric consistency over cost-driven general-purpose use.

FAQ

What is the exact Zener voltage range and test condition for TLZ3V9A-GS18?

The TLZ3V9A-GS18 has a guaranteed Zener voltage range of 3.74 V to 4.01 V, measured at a test current (I_ZT) of 20 mA and ambient temperature of 25 °C. This 3.9 V nominal rating with ±3.5% tolerance is confirmed in Table 1 of the Vishay datasheet (Doc. #85635, Rev. 2.6). The device maintains this specification across its full operating temperature range when properly heatsinked.

Does TLZ3V9A-GS18 support automated SMT assembly, and what are its reflow requirements?

Yes, TLZ3V9A-GS18 is qualified for automated SMT assembly using standard reflow profiles. As a MiniMELF (SOD-80) device with MSL Level 1 rating, it requires no pre-baking and withstands peak reflow temperatures up to 260 °C per J-STD-020. Its glass-body construction and UL 94 V-0 molding compound ensure mechanical integrity and flame resistance during reflow, making TLZ3V9A-GS18 suitable for high-volume manufacturing.

How does the dynamic resistance of TLZ3V9A-GS18 impact its performance in voltage reference circuits?

The TLZ3V9A-GS18 specifies a maximum dynamic resistance (Z_Z) of 50 Ω at 20 mA, meaning its output voltage varies by ≤1 mV per 20 μA change in Zener current. This low Z_Z ensures minimal regulation error under load transients-critical in precision ADC references and feedback networks where even small current shifts degrade accuracy. Lower Z_Z directly improves line and load regulation compared to alternatives like BZX55C3V9-TAP (Z_Z = 90 Ω).

Can TLZ3V9A-GS18 be used in automotive applications, and what qualifications does it meet?

TLZ3V9A-GS18 is suitable for under-hood and infotainment applications meeting AEC-Q200 stress requirements, including operating junction temperature up to 175 °C, storage range of –65 to +175 °C, and verified long-term stability. While not AEC-Q200 certified as a standalone part number, its TLZ-Series platform is widely deployed in automotive subsystems such as body control modules and sensor interfaces-provided system-level qualification is completed per customer requirements.

What is the reverse leakage current specification for TLZ3V9A-GS18, and why does it matter in low-power designs?

TLZ3V9A-GS18 guarantees reverse leakage current (I_R) ≤3 μA at V_R = 1 V and 25 °C. In low-power applications-such as battery-backed real-time clocks or energy-harvesting sensor nodes-this ultra-low leakage prevents excessive drain on supply rails, preserving battery life and ensuring accurate voltage division in high-impedance bias networks where even nanoampere errors cause significant offset.

TLZ3V9A-GS18 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Series:: TLZ

Package/Case:: DO-213AC, MINI-MELF, SOD-80

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 3.9 V

Tolerance:: -

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 50 Ohms

Current - Reverse Leakage @ Vr:: 3 µA @ 1 V

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

Operating Temperature:: -65°C ~ 175°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-80 MiniMELF

TLZ3V9A-GS18 FAQ

1.How can I place an order for TLZ3V9A-GS18 through Aetrix?

Please submit a Request for Quotation (RFQ) for TLZ3V9A-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 TLZ3V9A-GS18 reliable?

The price and inventory of TLZ3V9A-GS18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLZ3V9A-GS18 is usually 5 days.

3.What payment methods are accepted for TLZ3V9A-GS18?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLZ3V9A-GS18 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TLZ3V9A-GS18?

TLZ3V9A-GS18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TLZ3V9A-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 TLZ3V9A-GS18?

For technical support, including TLZ3V9A-GS18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLZ3V9A-GS18 requirements.

6.How does Aetrix verify that TLZ3V9A-GS18 is sourced from the original manufacturer or authorized distributors?

All TLZ3V9A-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 TLZ3V9A-GS18 meets industry standards.

7.What is the process for return or replacement of TLZ3V9A-GS18?

All TLZ3V9A-GS18 units undergo pre-shipment inspection (PSI). If there is an issue with TLZ3V9A-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 TLZ3V9A-GS18 part is unused and in its original packaging.

Return procedure for TLZ3V9A-GS18:

1.Submit a request within 90 days.

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

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