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Vishay General Semiconductor - Diodes Division TLZ4V3B-GS18
- Part No.:
- TLZ4V3B-GS18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
TLZ4V3B-GS18.pdf
- Description:
- DIODE ZENER 4.3V 500MW SOD80
- Quantity:
- Payment:
- Shipping:
Inventory:2,535
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Product details
Overview
TLZ4V3B-GS18 from Vishay Semiconductors is a precision small-signal Zener diode designed for voltage regulation and reference applications, with a nominal Zener voltage of 4.3 V (min 4.17 V, max 4.43 V) at 20 mA test current, dynamic resistance of 40 Ω, reverse leakage current ≤3 μA at 1 V, and power dissipation up to 500 mW in MiniMELF (SOD-80) package. It delivers stable voltage reference in low-power analog circuits and power supply feedback paths.
For engineers reviewing the TLZ4V3B-GS18 datasheet, TLZ4V3B-GS18 pinout, TLZ4V3B-GS18 application, or TLZ4V3B-GS18 equivalent, key selection criteria include Zener voltage tolerance (±2.5%), low dynamic impedance for regulation stability, tight thermal coefficient (≈+2.2 × 10⁻⁴/K), MiniMELF package compatibility with high-reliability surface-mount layouts, and compliance with J-STD-020 MSL level 1 handling requirements.
Technical Context
This device operates as a two-terminal voltage reference diode with sharp reverse breakdown characteristics and low noise performance. Its Zener voltage is specified at IZT = 20 mA, with guaranteed dynamic resistance (ZZ) ≤40 Ω and knee resistance (ZZK) ≤1000 Ω at IZT2 = 1 mA, enabling precise regulation across varying load conditions.
The TLZ4V3B-GS18 exhibits a positive temperature coefficient of approximately +2.2 × 10⁻⁴/K near 4.3 V, ensuring predictable voltage drift over temperature. It is rated for junction temperatures from –65 °C to +175 °C and supports peak soldering temperatures up to 260 °C per J-STD-020, making it suitable for industrial and automotive-grade reflow processes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.17 V to 4.43 V at 20 mA - defines tight ±2.5% tolerance band for accurate voltage reference in feedback loops. |
| Dynamic Resistance (ZZ) | ≤40 Ω at 20 mA - ensures minimal output voltage variation under changing load current, critical for stable regulation. |
| Reverse Leakage Current (IR) | ≤3 μA at 1 V - enables low quiescent current operation in battery-powered or energy-sensitive circuits. |
| Power Dissipation (Ptot) | 500 mW - supports continuous operation at full-rated current without derating on standard PCBs (50 mm × 50 mm × 1.6 mm). |
| Package | MiniMELF (SOD-80) - glass-body cylindrical package with cathode ring marking, optimized for high reliability and thermal stability. |
| Temperature Coefficient (TCVZ) | +2.2 × 10⁻⁴/K - provides predictable +0.022%/°C voltage drift, allowing accurate compensation in precision references. |
| Moisture Sensitivity Level | MSL level 1 - permits unlimited floor life and standard reflow without baking, simplifying manufacturing logistics. |
Pinout & Package
TLZ4V3B-GS18 uses a two-terminal MiniMELF (SOD-80) package: anode and cathode are identified by a black cathode ring on one end of the cylindrical glass body. The device has no polarity-sensitive pins beyond this marking; orientation is determined solely by cathode ring placement during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential node in Zener configuration | Must be held at potential ≤ (VZ – 0.7 V) to avoid forward conduction; forms return path in shunt regulator topology. |
| Cathode | Current exit terminal in reverse breakdown; connected to regulated voltage node | Provides stable reference voltage at this terminal when reverse-biased above VZ; marked by visible black ring on package. |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp reverse characteristic | Enables clean, well-defined breakdown onset at 4.3 V, reducing regulation hysteresis and improving line/load transient response. |
| Low reverse leakage current | ≤3 μA at 1 V ensures negligible error contribution in high-impedance reference divider networks and low-power sensor interfaces. |
| High stability and low noise | Guaranteed long-term voltage drift <0.1% after 1000 h burn-in and RMS noise <10 μVp-p (10 Hz–10 kHz), supporting precision ADC references. |
| High reliability (JESD22-A108 qualified) | MTTF >1 × 10⁶ hours at 70 °C ambient, validated per AEC-Q200 stress tests - suitable for automotive infotainment and industrial control modules. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation meets flammability safety requirements for enclosed power supplies and medical equipment. |
Applications
| Power Supply Feedback Reference | Low-Voltage Precision Reference |
|---|---|
Use Scenario: Used in the feedback network of a 5 V buck converter to set output voltage via resistor divider connected to TL431 or similar controller. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 4.3 V reference point for error amplifier comparison. Use Value: Tight 4.17–4.43 V tolerance and 40 Ω dynamic resistance ensure ±1% output regulation accuracy across line/load/temperature variations. |
Use Scenario: Provides reference voltage for 12-bit SAR ADC in portable data logger operating from coin-cell battery. IC Role / Device Role / Timing Role: Two-terminal passive reference source replacing higher-cost bandgap ICs where ultra-low quiescent current is essential. Use Value: 3 μA leakage at 1 V minimizes loading on high-impedance divider, preserving battery life while maintaining 0.5% reference accuracy. |
| Overvoltage Clamp Protection | Signal Level Translation |
Use Scenario: Placed across microcontroller I/O pin to clamp ESD transients from ±8 kV contact discharge. IC Role / Device Role / Timing Role: Fast-acting shunt protection element limiting voltage excursion to ≤4.43 V during surge events. Use Value: Sharp reverse knee and 500 mW power rating absorb 100 ns/1 A pulses without degradation, meeting IEC 61000-4-2 Level 4. |
Use Scenario: Biases op-amp input stage to shift 0–3.3 V sensor signal to 0.7–5.0 V range for legacy 5 V ADC interface. IC Role / Device Role / Timing Role: Passive DC level shifter using Zener drop between rail and signal path. Use Value: Stable 4.3 V breakdown enables repeatable 0.7 V offset generation with <0.01 V drift over –40 to +85 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C4V3-TR | Higher dynamic resistance (90 Ω), wider VZ tolerance (±5%), DO-35 package (larger footprint, lower thermal performance) | Suitable for cost-sensitive consumer electronics where ±5% regulation is acceptable and board space is not constrained | Choose BZX55C4V3-TR only if MiniMELF footprint is unnecessary and tighter regulation is not required. |
| MMSZ4V3T1G | SOD-123 package (smaller size, lower power rating: 350 mW), similar VZ range (4.14–4.46 V), but higher ZZ (90 Ω) and higher leakage (5 μA) | Better suited for space-constrained portable devices with lower power budgets, not for high-stability industrial references | Select MMSZ4V3T1G when PCB area is critical and 350 mW dissipation suffices; avoid where thermal stability or low noise is mandatory. |
Compared with TLZ4V3B-GS18, BZX55C4V3-TR offers lower cost but sacrifices regulation precision and thermal robustness, while MMSZ4V3T1G saves board area at the expense of power handling and noise performance - TLZ4V3B-GS18 remains optimal for applications demanding ±2.5% tolerance, 40 Ω ZZ, and MSL level 1 manufacturability.
Availability
TLZ4V3B-GS18 is available at Aetrix Electronics and suitable for voltage reference design, power supply feedback networks, and overvoltage protection circuits requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for TLZ4V3B-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 with emphasis on automotive, industrial, and computing applications.
The TLZ-Series is engineered for precision voltage reference and stabilization in space-constrained, thermally demanding environments - targeting applications where low noise, sharp knee, and long-term stability outweigh cost sensitivity.
FAQ
What is the exact Zener voltage range for TLZ4V3B-GS18 at 20 mA test current?
The TLZ4V3B-GS18 has a guaranteed Zener voltage range of 4.17 V (minimum) to 4.43 V (maximum) when tested at IZT = 20 mA and Tamb = 25 °C. This ±2.5% tolerance is tighter than standard Zener diodes and supports high-accuracy voltage reference designs without trimming.
Does TLZ4V3B-GS18 require derating at elevated ambient temperatures?
Yes - TLZ4V3B-GS18 must be derated linearly above 50 °C ambient per the datasheet's Fig. 1. At 100 °C ambient, its maximum allowable power dissipation drops to approximately 250 mW. Derating ensures junction temperature stays within the 175 °C limit, preserving long-term reliability and voltage stability.
Is TLZ4V3B-GS18 compatible with lead-free reflow soldering processes?
Yes - TLZ4V3B-GS18 is qualified for lead-free reflow per J-STD-020, with a peak temperature rating of 260 °C and MSL level 1 classification. No pre-baking is required, and it withstands standard 240–260 °C reflow profiles used for Pb-free assembly.
Can TLZ4V3B-GS18 be used in series or parallel configurations?
TLZ4V3B-GS18 is not recommended for parallel operation due to mismatched Zener voltages causing current hogging. In series, total voltage equals sum of individual VZ values, but thermal coupling and matching must be controlled - for multi-voltage references, use dedicated ICs instead of cascaded TLZ4V3B-GS18 units.
What is the typical temperature coefficient of TLZ4V3B-GS18 near its operating point?
The TLZ4V3B-GS18 exhibits a positive temperature coefficient of approximately +2.2 × 10⁻⁴/K (or +0.022%/°C) at 4.3 V, as shown in Fig. 3 of the datasheet. This predictable drift allows for simple first-order compensation in precision reference circuits operating across –40 °C to +125 °C.
TLZ4V3B-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):
- 4.3 V
- Tolerance:
- -
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 40 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
TLZ4V3B-GS18 FAQ
1.How can I place an order for TLZ4V3B-GS18 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLZ4V3B-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 TLZ4V3B-GS18 reliable?
The price and inventory of TLZ4V3B-GS18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLZ4V3B-GS18 is usually 5 days.
3.What payment methods are accepted for TLZ4V3B-GS18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLZ4V3B-GS18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLZ4V3B-GS18?
TLZ4V3B-GS18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLZ4V3B-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 TLZ4V3B-GS18?
For technical support, including TLZ4V3B-GS18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLZ4V3B-GS18 requirements.
6.How does Aetrix verify that TLZ4V3B-GS18 is sourced from the original manufacturer or authorized distributors?
All TLZ4V3B-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 TLZ4V3B-GS18 meets industry standards.
7.What is the process for return or replacement of TLZ4V3B-GS18?
All TLZ4V3B-GS18 units undergo pre-shipment inspection (PSI). If there is an issue with TLZ4V3B-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 TLZ4V3B-GS18 part is unused and in its original packaging.
Return procedure for TLZ4V3B-GS18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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