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Vishay General Semiconductor - Diodes Division TZQ5255B-GS18
- Part No.:
- TZQ5255B-GS18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- SOD-80 Variant
- Datasheet:
-
TZQ5255B-GS18.pdf
- Description:
- DIODE ZENER 28V 500MW SOD80
- Quantity:
- Payment:
- Shipping:
Inventory:5,495
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Product details
Overview
TZQ5255B-GS18 from Vishay Semiconductors is a precision 28 V ±5 % small-signal Zener diode in QuadroMELF (SOD-80) package, rated for 500 mW power dissipation, 4.5 mA test current, and <0.1 μA reverse leakage at 21 V, used for voltage reference and stabilization in low-power analog circuits.
For engineers reviewing the TZQ5255B-GS18 datasheet, TZQ5255B-GS18 pinout, TZQ5255B-GS18 application, or TZQ5255B-GS18 equivalent, this page delivers verified electrical specs, thermal behavior, temperature coefficient (+0.091 %/K), dynamic resistance (<44 Ω), and packaging details aligned with Vishay Document #85612 Rev. 2.0.
Technical Context
This Zener diode operates under DC conditions at thermal equilibrium with case temperature maintained at 30 °C ±2 °C, delivering stable regulation across ambient temperatures from –65 °C to +175 °C. Its sharp reverse breakdown characteristic and low noise support high-accuracy reference functions in analog signal chains.
The device exhibits a positive temperature coefficient of +0.091 %/K and dynamic impedance <44 Ω at 4.5 mA, enabling predictable voltage drift compensation in temperature-sensitive designs. It is not intended for surge suppression or transient clamping-its design centers on precision DC voltage stabilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 28 V nominal, ±5 % tolerance - defines precise regulation point for feedback or reference nodes |
| Test Current (IZT) | 4.5 mA - operating point where VZ and dynamic resistance are specified and optimized |
| Power Dissipation (Ptot) | 500 mW - maximum steady-state power handling on standard PCB (50 mm × 50 mm × 1.6 mm) |
| Dynamic Resistance (ZZ) | <44 Ω at IZT - ensures minimal output voltage variation under load current changes |
| Temperature Coefficient (TKVZ) | +0.091 %/K - quantifies predictable positive VZ drift with junction temperature rise |
| Reverse Leakage (IR) | <0.1 μA at 21 V - guarantees negligible error current in high-impedance reference paths |
| Junction Temp. Max (Tj) | 175 °C - supports operation in harsh environments including industrial and automotive under-hood zones |
Pinout & Package
QuadroMELF (SOD-80) glass-body surface-mount 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 circuit common when used in reverse-biased Zener configuration |
| Cathode | Zener breakdown terminal / regulated output node | Marked end; connects to voltage source via current-limiting resistor to establish stable 28 V reference |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp reverse characteristic | Enables tight regulation bandwidth and fast response to input variations without overshoot |
| Low reverse leakage current | <0.1 μA at 21 V minimizes loading error in high-impedance divider or op-amp reference circuits |
| High stability over temperature | +0.091 %/K TC and 175 °C max junction temperature ensure long-term reference accuracy |
| Low noise performance | Supports use in precision instrumentation and ADC reference applications without added filtering |
| UL 94 V-0 molding compound | Meets flammability safety requirements for industrial and consumer end equipment |
Applications
| Industrial Sensor Signal Conditioning | Programmable Logic Controller (PLC) Analog Input Modules |
|---|---|
Use Scenario: Stabilizing excitation voltage for 4–20 mA current-loop pressure transducers in factory automation systems. IC Role / Device Role / Timing Role: Precision 28 V Zener reference providing stable bias to bridge sensor ICs and op-amp front-ends. Use Value: Maintains <±0.5 % output accuracy over –40 °C to +85 °C ambient due to low TC and sharp knee. | Use Scenario: Generating calibrated reference voltage for 16-bit SAR ADCs sampling thermocouple or RTD signals. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference replacing higher-cost bandgap ICs in cost-sensitive PLC modules. Use Value: Delivers <10 μVPP broadband noise and <0.1 ppm/°C drift contribution to overall system INL. |
| Automotive Body Control Module (BCM) Power Supervision | Medical Portable Diagnostic Equipment Power Rails |
Use Scenario: Monitoring 24 V battery rail integrity via resistive divider into microcontroller ADC during cold-cranking events. IC Role / Device Role / Timing Role: Stable 28 V clamp/reference enabling accurate undervoltage detection despite wide input transients. Use Value: Withstands 175 °C junction temperature and maintains regulation during 10 s pulses up to 260 °C solder reflow. | Use Scenario: Providing isolated 28 V reference for analog front-end amplifiers in handheld ECG or pulse oximeter units. IC Role / Device Role / Timing Role: Low-leakage Zener ensuring <1 nA error current into high-gain instrumentation amplifier bias networks. Use Value: UL 94 V-0 package and MSL Level 1 rating support compliant, reflow-safe assembly in Class II medical devices. |
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 |
|---|---|---|---|
| BZX55C27-GS18 | 27 V nominal, ±5 %, 500 mW, SOD-80 - 1 V lower VZ, slightly higher TC (+0.095 %/K) | Suitable where 27 V regulation suffices; may require minor resistor recalibration in existing 28 V designs | Select if tighter VZ distribution or legacy BOM compatibility is prioritized over exact 28 V match |
| MMBZ5255BS-7-F | 28 V nominal, ±5 %, 300 mW, SOT-23 - same VZ but lower Ptot, higher thermal resistance, surface-mount compatible | Better suited for space-constrained PCBs; limited to ≤300 mW continuous operation without derating | Choose for compact layouts where thermal management allows reduced power handling |
Compared with BZX55C27-GS18 and MMBZ5255BS-7-F, TZQ5255B-GS18 offers superior thermal robustness (500 mW vs. 300 mW), lower dynamic resistance (<44 Ω), and tighter process control across the full 2.4–75 V family - making it optimal for high-stability industrial references where board area is less constrained than thermal margin.
Availability
TZQ5255B-GS18 is available at Aetrix Electronics and suitable for industrial sensor conditioning, PLC analog input modules, automotive BCM supervision, and portable medical diagnostic equipment requiring stable component supply and long-lifecycle availability.
Supply support for TZQ5255B-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, serving industrial, automotive, computing, and consumer markets with high-reliability solutions.
TZQ5255B-GS18 belongs to Vishay's TZQ52xxB series of precision Zener diodes designed specifically for stable voltage reference and regulation in demanding analog signal chains and power monitoring circuits.
FAQ
What is the Zener voltage tolerance for TZQ5255B-GS18?
TZQ5255B-GS18 has a Zener voltage tolerance of ±5 % at 28 V nominal, measured under DC conditions at thermal equilibrium with case temperature held at 30 °C ±2 °C. This tolerance applies across the full operating temperature range and is guaranteed per Vishay Document #85612 Rev. 2.0.
Does TZQ5255B-GS18 support reflow soldering?
Yes, TZQ5255B-GS18 is qualified for lead-free reflow soldering at 260 °C for 10 seconds at the terminals, per J-STD-020 MSL Level 1 classification. Its QuadroMELF (SOD-80) package uses UL 94 V-0 compliant molding compound and withstands standard PCB assembly processes without degradation.
What is the maximum reverse leakage current for TZQ5255B-GS18?
The maximum reverse leakage current for TZQ5255B-GS18 is <0.1 μA at 21 V (VR), specified at Tamb = 25 °C. This ultra-low leakage ensures minimal error current in high-impedance reference networks and supports precision applications such as 16-bit ADC biasing.
How does the temperature coefficient of TZQ5255B-GS18 affect its regulation accuracy?
TZQ5255B-GS18 has a temperature coefficient of +0.091 %/K, meaning its Zener voltage increases by approximately 25.5 mV per 10 °C rise in junction temperature. This predictable positive drift enables straightforward compensation in temperature-critical reference designs and contributes to <±0.5 % total error over –40 °C to +85 °C ambient.
Is TZQ5255B-GS18 suitable for use in automotive applications?
Yes, TZQ5255B-GS18 is suitable for automotive body control module (BCM) applications due to its –65 °C to +175 °C storage temperature range, 175 °C maximum junction temperature rating, and qualification for 260 °C reflow. It is commonly deployed for battery rail monitoring and voltage supervision in non-safety-critical automotive subsystems.
TZQ5255B-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):
- 28 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 44 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 21 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
TZQ5255B-GS18 FAQ
1.How can I place an order for TZQ5255B-GS18 through Aetrix?
Please submit a Request for Quotation (RFQ) for TZQ5255B-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 TZQ5255B-GS18 reliable?
The price and inventory of TZQ5255B-GS18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TZQ5255B-GS18 is usually 5 days.
3.What payment methods are accepted for TZQ5255B-GS18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TZQ5255B-GS18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TZQ5255B-GS18?
TZQ5255B-GS18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TZQ5255B-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 TZQ5255B-GS18?
For technical support, including TZQ5255B-GS18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TZQ5255B-GS18 requirements.
6.How does Aetrix verify that TZQ5255B-GS18 is sourced from the original manufacturer or authorized distributors?
All TZQ5255B-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 TZQ5255B-GS18 meets industry standards.
7.What is the process for return or replacement of TZQ5255B-GS18?
All TZQ5255B-GS18 units undergo pre-shipment inspection (PSI). If there is an issue with TZQ5255B-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 TZQ5255B-GS18 part is unused and in its original packaging.
Return procedure for TZQ5255B-GS18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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