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Vishay General Semiconductor - Diodes Division TZQ5259B-GS18
- Part No.:
- TZQ5259B-GS18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- SOD-80 Variant
- Datasheet:
-
TZQ5259B-GS18.pdf
- Description:
- DIODE ZENER 39V 500MW SOD80
- Quantity:
- Payment:
- Shipping:
Inventory:2,054
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Product details
Overview
TZQ5259B-GS18 from Vishay Semiconductors is a precision small-signal Zener diode with nominal zener voltage of 39 V, ±5 % tolerance, 3.2 mA test current (IZT), < 0.1 μA reverse leakage at VR = 30 V, and dynamic resistance of 30 Ω at IZT - designed for stable voltage reference and regulation in low-power analog circuits.
For engineers reviewing the TZQ5259B-GS18 datasheet, TZQ5259B-GS18 pinout, TZQ5259B-GS18 application, or TZQ5259B-GS18 equivalent, key selection criteria include its QuadroMELF SOD-80 package, MSL Level 1 solderability, -65 °C to +175 °C storage range, and temperature coefficient of +0.094 %/K - critical for high-stability biasing and calibration circuits.
Technical Context
This device operates as a two-terminal voltage reference, relying on controlled avalanche breakdown in silicon to maintain a stable reverse-bias voltage across its terminals under defined current conditions. Its sharp reverse characteristic and low noise support precision DC referencing where thermal drift and signal integrity are tightly constrained.
The TZQ5259B-GS18 is characterized at thermal equilibrium with case temperature held at 30 °C ± 2 °C, and its zener voltage specification applies only under those stabilized conditions. Its positive temperature coefficient (+0.094 %/K) indicates increasing VZ with junction temperature - a key design consideration when used in temperature-compensated references or series-shunt regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal, ±5 % tolerance - defines precise regulation point for feedback loops or reference rails. |
| Test Current (IZT) | 3.2 mA - required bias current to achieve specified VZ; impacts power budget and resistor sizing. |
| Dynamic Resistance (ZZ) | 30 Ω at IZT - determines output impedance and load regulation sensitivity in shunt configurations. |
| Reverse Leakage (IR) | < 0.1 μA at VR = 30 V - ensures minimal error current in high-impedance reference nodes. |
| Temperature Coefficient (TKVZ) | +0.094 %/K - quantifies VZ drift per degree Celsius; enables thermal error modeling in precision designs. |
| Power Dissipation (Ptot) | 500 mW maximum - sets upper limit for continuous dissipation in ambient air without heatsinking. |
| Junction Temperature (Tj) | 175 °C max - defines thermal operating ceiling for reliability in sealed or high-ambient environments. |
Pinout & Package
Package: QuadroMELF (SOD-80), glass-encapsulated cylindrical surface-mount package with cathode identification band; weight ≈ 34 mg; UL 94 V-0 molding compound; MSL Level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in shunt regulator | Connected to ground or lower-potential node; carries forward current up to 200 mA (VF ≤ 1.5 V). |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input supply via current-limiting resistor; provides stable 39 V reference relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp reverse characteristic | Enables tight regulation bandwidth and fast recovery from overvoltage transients in clamp circuits. |
| Low reverse leakage current | < 0.1 μA at 30 V supports ultra-low-power bias networks and high-impedance sensor references. |
| High stability over temperature and time | Guaranteed ±5 % VZ tolerance and +0.094 %/K TKVZ enable predictable long-term performance in unregulated environments. |
| Low noise operation | Minimizes added voltage noise in precision analog front-ends and ADC reference paths. |
| QuadroMELF robustness | Hermetic glass seal and MSL Level 1 rating ensure reliability in reflow-soldered industrial and automotive PCBs. |
Applications
| Voltage Reference for Precision ADCs | Overvoltage Clamp in Sensor Interfaces |
|---|---|
|
Use Scenario: Providing stable 39 V reference to 16-bit SAR ADCs in industrial data acquisition systems. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference establishing exact full-scale input range. Use Value: Enables sub-LSB accuracy by minimizing VREF drift (< ±0.094 %/K) and noise contribution in ratiometric measurements. |
Use Scenario: Protecting downstream op-amps and ADC inputs from transient surges in 36 V rail sensor nodes. IC Role / Device Role / Timing Role: Passive clamping element limiting voltage excursions above 39 V. Use Value: Absorbs energy without latch-up due to low dynamic resistance (30 Ω) and 500 mW Ptot rating. |
| Stabilized Bias for RF Power Amplifiers | Calibration Reference in Portable Test Equipment |
|
Use Scenario: Setting quiescent current in GaN FET driver stages requiring thermally stable gate bias. IC Role / Device Role / Timing Role: Zener-based current source reference in cascode bias networks. Use Value: Maintains consistent bias point across -40 °C to +125 °C ambient due to predictable +0.094 %/K TC. |
Use Scenario: Serving as traceable 39 V calibration point in handheld multimeters and portable oscilloscopes. IC Role / Device Role / Timing Role: Primary voltage standard against which internal DACs and dividers are adjusted. Use Value: Delivers long-term stability and low hysteresis, verified by < 0.1 μA IR and < 30 Ω ZZ at 3.2 mA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C39 (ON Semiconductor) | Same 39 V nominal, ±5 %, but TO-92 through-hole package; higher RthJA (500 K/W vs. SOD-80's 500 K/W on PCB); no MSL rating. | Suitable for prototyping or legacy through-hole boards; not recommended for automated SMT production or humid environments. | Select when manual assembly or socketing is required; avoid for high-volume SMT or moisture-sensitive applications. |
| MMSZ5259B (Vishay) | SOD-123 package; identical electrical specs (39 V, ±5 %, 3.2 mA IZT, 30 Ω ZZ), but MSL Level 1 rating and 260 °C/10 s reflow compatibility match TZQ5259B-GS18. | Drop-in replacement in space-constrained layouts where QuadroMELF footprint is unavailable; same thermal and reliability profile. | Prefer for compact PCBs needing SOD-123 footprint; verify pad geometry and thermal relief for 500 mW dissipation. |
Compared with BZX55C39 and MMSZ5259B, the TZQ5259B-GS18 offers superior mechanical robustness in QuadroMELF form, optimized for high-reliability SMT manufacturing and extended temperature operation - making it ideal for industrial and automotive-grade voltage reference designs where long-term stability and process compatibility are mandatory.
Availability
TZQ5259B-GS18 is available at Aetrix Electronics and suitable for industrial instrumentation, sensor signal conditioning, precision power supply feedback, and calibration equipment requiring stable component supply with full traceability and lifecycle management.
Supply support for TZQ5259B-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 performance.
The TZQ52xxB series belongs to Vishay's precision small-signal Zener diode product line, engineered for stable voltage referencing in demanding analog, industrial, and automotive applications where low noise, tight tolerance, and thermal predictability are essential.
FAQ
What is the nominal zener voltage and tolerance of TZQ5259B-GS18?
The TZQ5259B-GS18 has a nominal zener voltage of 39 V with a tolerance of ±5 %, measured at thermal equilibrium with case temperature maintained at 30 °C ± 2 °C and test current IZT = 3.2 mA. This tolerance directly defines the allowable deviation in voltage regulation applications and must be accounted for in reference accuracy budgets.
What package type does TZQ5259B-GS18 use, and what are its key handling features?
TZQ5259B-GS18 uses the QuadroMELF (SOD-80) glass-encapsulated cylindrical package, weighing approximately 34 mg. It carries UL 94 V-0 flammability rating and MSL Level 1 classification per J-STD-020, allowing unlimited floor life and compatibility with standard 260 °C/10 s reflow profiles - critical for high-yield SMT assembly.
How does the temperature coefficient of TZQ5259B-GS18 affect its performance in varying ambient conditions?
The TZQ5259B-GS18 exhibits a positive temperature coefficient of +0.094 %/K, meaning its zener voltage increases by approximately 0.037 V per 10 °C rise in junction temperature. This behavior must be modeled in precision reference designs - especially when used without compensation - to avoid systematic gain or offset errors over temperature.
What is the maximum power dissipation rating for TZQ5259B-GS18, and how is it derated with temperature?
TZQ5259B-GS18 is rated for 500 mW maximum total power dissipation at Tamb = 25 °C with RthJA ≤ 300 K/W. Derating follows the curve in Figure 1 of the datasheet: power capability decreases linearly to zero at ~125 °C ambient on a standard 50 mm × 50 mm × 1.6 mm PCB, requiring thermal design validation for sustained operation above 70 °C.
Can TZQ5259B-GS18 be used in forward-bias applications, and what is its forward voltage specification?
Yes, TZQ5259B-GS18 can conduct in forward bias: its maximum forward voltage is 1.5 V at IF = 200 mA. While not optimized for rectification, this capability supports dual-use in protection circuits (e.g., reverse-polarity safeguard) or diagnostic current paths - but forward conduction should remain brief and current-limited to avoid thermal stress.
TZQ5259B-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):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 30 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
TZQ5259B-GS18 FAQ
1.How can I place an order for TZQ5259B-GS18 through Aetrix?
Please submit a Request for Quotation (RFQ) for TZQ5259B-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 TZQ5259B-GS18 reliable?
The price and inventory of TZQ5259B-GS18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TZQ5259B-GS18 is usually 5 days.
3.What payment methods are accepted for TZQ5259B-GS18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TZQ5259B-GS18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TZQ5259B-GS18?
TZQ5259B-GS18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TZQ5259B-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 TZQ5259B-GS18?
For technical support, including TZQ5259B-GS18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TZQ5259B-GS18 requirements.
6.How does Aetrix verify that TZQ5259B-GS18 is sourced from the original manufacturer or authorized distributors?
All TZQ5259B-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 TZQ5259B-GS18 meets industry standards.
7.What is the process for return or replacement of TZQ5259B-GS18?
All TZQ5259B-GS18 units undergo pre-shipment inspection (PSI). If there is an issue with TZQ5259B-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 TZQ5259B-GS18 part is unused and in its original packaging.
Return procedure for TZQ5259B-GS18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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