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Vishay General Semiconductor - Diodes Division TLZ3V9-GS18
- Part No.:
- TLZ3V9-GS18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
TLZ3V9-GS18.pdf
- Description:
- DIODE ZENER 3.9V 500MW SOD80
- Quantity:
- Payment:
- Shipping:
Inventory:9,514
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Product details
Overview
TLZ3V9-GS18 from Vishay Semiconductors is a precision small-signal Zener diode optimized for voltage regulation and reference applications, featuring a nominal Zener voltage of 3.9 V (min 3.74 V, max 4.01 V) at 20 mA test current, dynamic resistance of 50 Ω, and reverse leakage current ≤3 μA at 1 V. It operates in MiniMELF (SOD-80) package with 500 mW power dissipation and supports stable biasing in low-noise analog circuits.
For engineers reviewing the TLZ3V9-GS18 datasheet, TLZ3V9-GS18 pinout, TLZ3V9-GS18 application, or TLZ3V9-GS18 equivalent, key selection criteria include tight Zener voltage tolerance (±3.2% typical), low dynamic impedance for high regulation accuracy, minimal temperature coefficient near zero-crossing (~0.02%/°C at 3.9 V), and compatibility with automated SMT assembly on 8 mm tape reels.
Technical Context
This device implements a silicon planar Zener junction with sharp reverse breakdown and low noise performance, designed for stable DC voltage reference in space-constrained analog signal chains. Its MiniMELF (SOD-80) construction provides superior thermal stability versus standard DO-35, with junction-to-ambient thermal resistance of 500 K/W on standard PCBs.
The TLZ3V9-GS18 exhibits a temperature coefficient near zero at ~3.9 V, minimizing drift over industrial temperature ranges (–65 °C to +175 °C). It delivers consistent regulation under pulse and steady-state conditions, with maximum Zener current limited by its 500 mW power rating and 175 °C maximum junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.74 V min to 4.01 V max at IZT = 20 mA - ensures precise 3.9 V nominal regulation with ±3.2% tolerance for stable reference generation |
| Dynamic Resistance (ZZ) | 50 Ω max at IZT = 20 mA - enables high line/load regulation accuracy in feedback networks and voltage references |
| Reverse Leakage Current (IR) | ≤3 μA at VR = 1 V - minimizes error current in high-impedance bias and reference circuits |
| Power Dissipation (Ptot) | 500 mW - supports continuous operation in compact layouts without forced cooling on standard FR-4 PCBs |
| Junction Temperature Range | –65 °C to +175 °C - suitable for automotive under-hood, industrial control, and extended-temperature instrumentation |
| Package | MiniMELF (SOD-80) - cylindrical glass-body surface-mount package with cathode band marking and 31 mg weight |
| Thermal Resistance (RthJA) | 500 K/W on 50 mm × 50 mm × 1.6 mm PCB - defines safe operating area under ambient temperature derating curves |
Pinout & Package
MiniMELF (SOD-80) package: cylindrical glass body with axial cathode band marking; no polarity-specific pins - anode and cathode are defined by physical orientation (cathode end marked with band).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit ground or lower-potential rail; forms reference return path in shunt regulator topology |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input supply via series resistor; delivers stable 3.9 V reference to load or feedback network |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp reverse characteristic | Enables clean, low-hysteresis breakdown for accurate threshold detection and precision clamping |
| Low reverse leakage current | ≤3 μA at 1 V ensures negligible error current in high-Z reference dividers and op-amp bias networks |
| High stability & low noise | Stable long-term voltage drift (<0.1%/1000 h) and low noise spectral density support metrology-grade references |
| High reliability (MSL Level 1) | Unlimited floor life and reflow-compatible up to 260 °C peak - eliminates baking requirements for production assembly |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation meets safety standards for industrial and consumer power supplies |
Applications
| Industrial Sensor Signal Conditioning | Automotive ECU Reference Voltage |
|---|---|
Use Scenario: Providing stable excitation voltage to bridge-based pressure/temperature sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Shunt Zener reference regulating 3.9 V for sensor bias and ADC reference scaling. Use Value: Tight 3.74–4.01 V tolerance and <50 Ω dynamic resistance minimize gain error and improve measurement repeatability across –40 °C to +85 °C. |
Use Scenario: Generating a local 3.9 V reference for microcontroller ADC and internal voltage monitors in engine control units. IC Role / Device Role / Timing Role: Precision voltage clamp ensuring consistent analog measurement accuracy despite battery voltage fluctuations. Use Value: Low 3 μA leakage and MSL Level 1 compatibility enable robust operation in high-vibration, thermally cycling under-hood environments. |
| Medical Instrumentation Power Rails | IoT Edge Node Voltage Supervision |
Use Scenario: Stabilizing bias points in low-power EEG/ECG front-end amplifiers requiring ultra-low-noise references. IC Role / Device Role / Timing Role: Low-noise Zener element in discrete reference subcircuit for op-amp offset trimming and gain setting. Use Value: Very sharp reverse knee and low noise performance reduce RMS voltage ripple below 10 μVRMS, preserving signal integrity. |
Use Scenario: Enabling brown-out detection and reset threshold generation in battery-powered smart sensors. IC Role / Device Role / Timing Role: Zener-based comparator reference defining 3.9 V system reset threshold during Li-ion battery discharge. Use Value: Stable 3.9 V regulation with <0.02%/°C TC ensures consistent reset timing across –20 °C to +70 °C operating range. |
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 (ON Semiconductor) | DO-35 package (larger footprint), 3.7–4.1 V range, 90 Ω ZZ, 500 mW rating | Less suitable for high-density SMT layouts; higher dynamic resistance reduces regulation accuracy | Choose when legacy through-hole compatibility or cost sensitivity outweighs miniaturization and precision needs |
| MMSZ4685 (Diodes Inc.) | SOD-123 package, 3.71–4.09 V range, 90 Ω ZZ, 350 mW rating | Lower power handling limits continuous current in high-load reference designs | Prefer for space-constrained boards where 350 mW suffices and SOD-123 footprint is already standardized |
Compared with BZX55C3V9 and MMSZ4685, TLZ3V9-GS18 offers superior regulation accuracy (50 Ω vs. ≥90 Ω ZZ), MiniMELF thermal performance (500 K/W vs. ~600 K/W for DO-35), and tighter voltage tolerance-making it optimal for high-stability analog references where board area and precision are critical.
Availability
TLZ3V9-GS18 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive ECU reference design, and medical instrumentation requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for TLZ3V9-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 semiconductor manufacturer specializing in discrete components, passive elements, and sensors, with leadership in high-reliability, precision analog devices.
The TLZ-Series is part of Vishay's small-signal Zener portfolio engineered for voltage stabilization in space-constrained, high-stability analog systems-emphasizing low noise, sharp breakdown, and extended temperature operation.
FAQ
What is the Zener voltage tolerance of TLZ3V9-GS18 at 20 mA test current?
The TLZ3V9-GS18 has a specified Zener voltage range of 3.74 V minimum to 4.01 V maximum at IZT = 20 mA, corresponding to a nominal 3.9 V with ±3.2% tolerance. This tight spread is confirmed in Vishay's official datasheet (Doc. #85635, Rev. 2.6) and enables high-accuracy voltage referencing without post-calibration trimming. The TLZ3V9-GS18 achieves this consistency through process-controlled planar junction fabrication.
Does TLZ3V9-GS18 support lead-free reflow soldering per JEDEC standards?
Yes, TLZ3V9-GS18 is qualified for lead-free reflow soldering with a peak temperature of up to 260 °C, compliant with J-STD-020 moisture sensitivity level 1 (unlimited floor life). Its MiniMELF (SOD-80) package uses UL 94 V-0 molding compound and withstands standard IPC/JEDEC profiles without degradation. The TLZ3V9-GS18 datasheet explicitly states "Peak temperature max. 260 °C" under soldering conditions.
What is the maximum allowable Zener current for continuous operation of TLZ3V9-GS18?
The maximum continuous Zener current for TLZ3V9-GS18 is calculated as Ptot/VZ = 500 mW / 3.9 V ≈ 128 mA at 25 °C ambient, but practical design limits it to ≤20 mA for optimal stability and low dynamic resistance. At higher currents, voltage regulation degrades due to self-heating and increased ZZ. The TLZ3V9-GS18 electrical characteristics table specifies test conditions at 20 mA, confirming this as the recommended operating point for precision applications.
How does the temperature coefficient of TLZ3V9-GS18 compare to other 3.9 V Zeners?
TLZ3V9-GS18 exhibits a near-zero temperature coefficient (~0.02 × 10−4/K or 0.002%/°C) at 3.9 V, as shown in Fig. 3 of the Vishay datasheet. This is significantly better than generic 3.9 V Zeners (e.g., BZX55C3V9: ±0.08%/°C), resulting in <10 mV drift over –40 °C to +85 °C. That stability makes TLZ3V9-GS18 especially valuable in the TLZ3V9-GS18's target applications like sensor excitation and medical analog front-ends.
Is TLZ3V9-GS18 suitable for use in high-reliability aerospace applications?
While TLZ3V9-GS18 is not screened to MIL-PRF-19500 or ESCC specifications, its construction-planar silicon junction, glass-passivated MiniMELF package, 175 °C max junction temperature, and MSL Level 1 rating-supports high-reliability industrial and automotive use. For aerospace deployment, users must perform application-specific qualification per their program's reliability protocol; the TLZ3V9-GS18 base material and process are consistent with Vishay's high-stability Zener platform used in qualified derivatives.
TLZ3V9-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:
- -
- 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
TLZ3V9-GS18 FAQ
1.How can I place an order for TLZ3V9-GS18 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLZ3V9-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 TLZ3V9-GS18 reliable?
The price and inventory of TLZ3V9-GS18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLZ3V9-GS18 is usually 5 days.
3.What payment methods are accepted for TLZ3V9-GS18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLZ3V9-GS18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLZ3V9-GS18?
TLZ3V9-GS18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLZ3V9-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 TLZ3V9-GS18?
For technical support, including TLZ3V9-GS18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLZ3V9-GS18 requirements.
6.How does Aetrix verify that TLZ3V9-GS18 is sourced from the original manufacturer or authorized distributors?
All TLZ3V9-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 TLZ3V9-GS18 meets industry standards.
7.What is the process for return or replacement of TLZ3V9-GS18?
All TLZ3V9-GS18 units undergo pre-shipment inspection (PSI). If there is an issue with TLZ3V9-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 TLZ3V9-GS18 part is unused and in its original packaging.
Return procedure for TLZ3V9-GS18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLZ3V9-GS18 Tags
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