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Vishay General Semiconductor - Diodes Division TZQ5257B-GS18
- Part No.:
- TZQ5257B-GS18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- SOD-80 Variant
- Datasheet:
-
TZQ5257B-GS18.pdf
- Description:
- DIODE ZENER 33V 500MW SOD80
- Quantity:
- Payment:
- Shipping:
Inventory:3,658
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Product details
Overview
TZQ5257B-GS18 from Vishay Semiconductors is a precision small-signal Zener diode with nominal zener voltage of 33 V, ±5 % tolerance, 3.8 mA test current (IZT), < 0.1 μA reverse leakage at VR, and dynamic resistance of 25 Ω at IZT - used for stable voltage reference and regulation in low-power analog circuits.
For engineers reviewing the TZQ5257B-GS18 datasheet, TZQ5257B-GS18 pinout, TZQ5257B-GS18 application, or TZQ5257B-GS18 equivalent, key selection criteria include zener voltage accuracy, temperature coefficient (+0.092 %/K), thermal stability up to 175 °C junction temperature, and QuadroMELF SOD-80 package suitability for high-reliability PCB layouts requiring minimal parasitic capacitance and robust thermal performance.
Technical Context
This device operates as a two-terminal voltage reference under reverse-biased DC conditions, maintaining regulation via controlled avalanche breakdown. Its electrical behavior is defined at thermal equilibrium with case temperature held at 30 °C ± 2 °C, and it exhibits low noise and very sharp reverse characteristic per Vishay specification.
The TZQ5257B-GS18 is rated for 500 mW total power dissipation with RthJA = 500 K/W on standard PCB (50 mm × 50 mm × 1.6 mm), and supports stable operation across -65 °C to +175 °C storage range - making it suitable for industrial and automotive environments where thermal cycling and long-term voltage drift must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V nominal, ±5 % tolerance - ensures predictable clamping level in reference and protection circuits |
| Test Current (IZT) | 3.8 mA - defines operating point where VZ and dynamic resistance are specified |
| Dynamic Resistance (ZZ) | 25 Ω at IZT - determines output impedance and load regulation sensitivity |
| Reverse Leakage (IR) | < 0.1 μA at VR - minimizes standby current in battery-powered or high-impedance bias networks |
| Temperature Coefficient (TKVZ) | +0.092 %/K - quantifies VZ drift over temperature; enables accurate compensation in precision references |
| Power Dissipation (Ptot) | 500 mW - sets maximum continuous power handling on standard PCB layout |
| Junction Temperature (Tj) | 175 °C max - supports operation in high-ambient industrial environments without derating |
Pinout & Package
QuadroMELF (SOD-80) surface-mount glass package with axial cathode identification band; no discrete pins - terminals are anode and cathode ends of cylindrical body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to lower-potential side in reverse-bias configuration; forms return path for Zener current |
| Cathode | Zener voltage reference terminal | Marked end with band; supplies regulated 33 V output when reverse-biased relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp reverse characteristic | Enables precise voltage threshold detection with minimal knee spread - critical for tight-tolerance reference designs |
| Low reverse leakage current | < 0.1 μA at VR ensures negligible error current in high-impedance divider or sensor bias networks |
| High stability over time and temperature | Specified thermal equilibrium testing and +0.092 %/K TKVZ support long-term calibration integrity in instrumentation |
| Low noise performance | Reduces voltage reference jitter in sensitive analog signal chains such as ADC front-ends or PLL loops |
| UL 94 V-0 molding compound | Meets flammability safety requirements for industrial and transportation equipment enclosures |
Applications
| Voltage Reference for Precision ADCs | Overvoltage Clamp in Sensor Interfaces |
|---|---|
Use Scenario: Providing stable 33 V reference to 16-bit SAR ADC in industrial data acquisition module. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing absolute scale for analog-to-digital conversion. Use Value: ±5 % VZ tolerance and +0.092 %/K TKVZ enable sub-LSB drift over 0–70 °C ambient range without active compensation. | Use Scenario: Protecting 3.3 V microcontroller GPIO from transient surges on 24 V field bus lines. IC Role / Device Role / Timing Role: Passive shunt clamp limiting input voltage to safe level during ESD or inductive kick events. Use Value: 500 mW Ptot rating and < 0.1 μA IR allow reliable clamping without loading normal 24 V signal path. |
| Low-Power Bias Network in RF Front-End | Calibration Reference in Portable Test Equipment |
Use Scenario: Generating stable bias point for LNA amplifier in battery-operated spectrum analyzer frontend. IC Role / Device Role / Timing Role: Low-noise Zener source replacing higher-current IC reference to minimize quiescent power draw. Use Value: Low noise and 25 Ω ZZ maintain SNR integrity while drawing only 3.8 mA at regulation point. | Use Scenario: Serving as traceable 33 V calibration node in handheld multimeter reference subsystem. IC Role / Device Role / Timing Role: Primary voltage standard against which DMM internal DACs and amplifiers are trimmed. Use Value: High stability and thermal equilibrium characterization support NIST-traceable calibration repeatability over multiple thermal cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C33 (ON Semiconductor) | Same 33 V nominal, ±5 %, but TO-92 package (larger footprint, higher RthJA ≈ 550 K/W) | Less suitable for space-constrained or high-density PCBs; higher thermal resistance limits power handling in compact layouts | Select when through-hole assembly or legacy footprint compatibility is required |
| MMBZ5257BLT1G (onsemi) | SOT-23 package, same 33 V/±5 %, but lower Ptot (200 mW) and higher IR (≤ 0.5 μA) | Not recommended for continuous 3.8 mA operation or low-leakage bias networks; better for intermittent clamping | Select only for ultra-compact layouts where 500 mW derating and sub-μA leakage are not critical |
Compared with BZX55C33 and MMBZ5257BLT1G, the TZQ5257B-GS18 delivers superior thermal performance (500 mW @ 500 K/W), lowest leakage (< 0.1 μA), and QuadroMELF mechanical robustness - making it optimal for high-stability, surface-mount voltage reference designs demanding long-term repeatability.
Availability
TZQ5257B-GS18 is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, low-power bias network, and calibration standard applications requiring stable component supply and full traceability.
Supply support for TZQ5257B-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, sensors, and passive elements with emphasis on reliability, precision, and high-temperature operation.
The TZQ52xxB series belongs to Vishay's precision small-signal Zener diode product line, engineered for stable voltage reference and regulation in industrial, automotive, and test equipment where long-term drift and thermal hysteresis must be minimized.
FAQ
What is the nominal zener voltage and tolerance of TZQ5257B-GS18?
The TZQ5257B-GS18 has a nominal zener voltage of 33 V with a tolerance of ±5 %, measured at thermal equilibrium under specified test conditions (IZT = 3.8 mA). This tolerance ensures predictable regulation performance in precision reference and clamp applications without requiring post-production trimming.
What package type does TZQ5257B-GS18 use, and what are its key mechanical features?
TZQ5257B-GS18 uses the QuadroMELF (SOD-80) glass package - a cylindrical surface-mount format with cathode identified by a band. It weighs approximately 34 mg, carries UL 94 V-0 flammability rating, and is rated MSL level 1, enabling reflow soldering at 260 °C for 10 seconds without preconditioning.
What is the maximum power dissipation and thermal resistance of TZQ5257B-GS18?
TZQ5257B-GS18 has a maximum total power dissipation (Ptot) of 500 mW at Tamb = 25 °C, with a junction-to-ambient thermal resistance (RthJA) of 500 K/W on a standard 50 mm × 50 mm × 1.6 mm PCB. This allows sustained operation at full rating in well-ventilated industrial environments.
How does the temperature coefficient of TZQ5257B-GS18 affect its voltage stability?
The TZQ5257B-GS18 has a positive temperature coefficient of +0.092 %/K, meaning its zener voltage increases by approximately 30.4 mV per 10 °C rise in junction temperature. This known drift enables predictable compensation in temperature-critical reference designs, especially when combined with thermal equilibrium testing methodology.
Is TZQ5257B-GS18 suitable for low-leakage bias networks in high-impedance circuits?
Yes - TZQ5257B-GS18 specifies reverse leakage current (IR) of less than 0.1 μA at rated VR, making it appropriate for high-impedance bias networks such as photodiode transimpedance amplifier references or precision op-amp offset nulling, where leakage-induced errors must remain below nanoampere levels.
TZQ5257B-GS18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- SOD-80 Variant
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 58 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 25 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
TZQ5257B-GS18 FAQ
1.How can I place an order for TZQ5257B-GS18 through Aetrix?
Please submit a Request for Quotation (RFQ) for TZQ5257B-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 TZQ5257B-GS18 reliable?
The price and inventory of TZQ5257B-GS18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TZQ5257B-GS18 is usually 5 days.
3.What payment methods are accepted for TZQ5257B-GS18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TZQ5257B-GS18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TZQ5257B-GS18?
TZQ5257B-GS18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TZQ5257B-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 TZQ5257B-GS18?
For technical support, including TZQ5257B-GS18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TZQ5257B-GS18 requirements.
6.How does Aetrix verify that TZQ5257B-GS18 is sourced from the original manufacturer or authorized distributors?
All TZQ5257B-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 TZQ5257B-GS18 meets industry standards.
7.What is the process for return or replacement of TZQ5257B-GS18?
All TZQ5257B-GS18 units undergo pre-shipment inspection (PSI). If there is an issue with TZQ5257B-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 TZQ5257B-GS18 part is unused and in its original packaging.
Return procedure for TZQ5257B-GS18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TZQ5257B-GS18 Tags
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