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Vishay General Semiconductor - Diodes Division TZX12D-TR
- Part No.:
- TZX12D-TR
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
TZX12D-TR.pdf
- Description:
- DIODE ZENER 12V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:15,934
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Product details
Overview
TZX12D-TR from Vishay Semiconductors is a silicon planar Zener diode in DO-35 (DO-204AH) package, designed for precision voltage regulation and reference applications. It delivers a nominal Zener voltage of 12.2–12.7 V at 5 mA test current, with dynamic resistance of 35 Ω, reverse leakage current ≤ 0.04 μA at 9.5 V, and maximum power dissipation of 500 mW at 25 °C ambient.
For engineers reviewing the TZX12D-TR datasheet, TZX12D-TR pinout, TZX12D-TR application, or TZX12D-TR equivalent, this device serves as a stable, low-noise, high-stability voltage reference in analog power supply feedback loops, sensor biasing circuits, and overvoltage protection clamps where tight tolerance and thermal stability are required.
Technical Context
The TZX12D-TR operates as a single-element, cathode-anode configured Zener diode with sharp reverse breakdown characteristics and low noise performance. Its junction temperature range spans –65 °C to +175 °C, and it exhibits a positive temperature coefficient of approximately +6 × 10⁻⁴/K near 12 V, enabling predictable drift compensation in reference designs.
Thermal resistance junction-to-ambient is 300 K/W at 4 mm lead length, and its DO-35 package supports manual or automated through-hole assembly. The device is rated MSL level 1 per J-STD-020 and complies with UL 94 V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12.2–12.7 V at IZT = 5 mA - defines precise regulation point for feedback or reference use |
| Dynamic Resistance (ZZ) | 35 Ω max at IZT = 5 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage Current (IR) | ≤ 0.04 μA at VR = 9.5 V - enables ultra-low standby power in battery-backed references |
| Power Dissipation (Ptot) | 500 mW at TL = 25 °C - supports continuous operation in compact PCB layouts with 4 mm lead length |
| Junction Temperature Range | –65 °C to +175 °C - allows deployment in industrial and automotive under-hood environments |
| Package | DO-35 (DO-204AH), axial leaded - compatible with legacy through-hole assembly and hand-soldering workflows |
| Thermal Resistance RthJA | 300 K/W at l = 4 mm - informs heatsinking requirements when operating near Ptot limit |
Pinout & Package
DO-35 (DO-204AH) package: axial glass body, 2.6 mm diameter × 4.1 mm length, 0.4–0.6 mm lead diameter, cathode identified by band. Leads are tinned and solderable per IPC-J-STD-006.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground node | Connected to circuit ground or lower-potential rail; forms reference return path in shunt regulator topologies |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input voltage source via series resistor; supplies stable voltage to load or error amplifier input |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp reverse characteristic | Enables clean, well-defined knee voltage at 12.2–12.7 V, reducing regulation uncertainty in precision feedback paths |
| Low reverse leakage current | ≤ 0.04 μA at 9.5 V minimizes error current in high-impedance reference dividers and sensor excitation circuits |
| Very high stability | Long-term Zener voltage drift < 0.1 %/1000 h under rated conditions supports calibration-critical instrumentation |
| Low noise | Sub-microvolt RMS noise floor preserves signal integrity in low-level analog measurement front-ends |
| UL 94 V-0 molding compound | Ensures flame-retardant reliability in safety-compliant industrial control and power supply enclosures |
Applications
| Voltage Reference for Op-Amp Circuits | Overvoltage Clamp in Sensor Interfaces |
|---|---|
Use Scenario: Provides stable 12.2–12.7 V reference to bias op-amp input stages or set gain in precision instrumentation amplifiers. IC Role / Device Role / Timing Role: Shunt voltage reference element establishing fixed DC potential for analog signal conditioning. Use Value: Dynamic resistance of 35 Ω maintains reference accuracy within ±0.5 % across 1–10 mA load variations. |
Use Scenario: Clamps transient overvoltage on analog sensor outputs (e.g., RTD, thermocouple amplifiers) before ADC input. IC Role / Device Role / Timing Role: Protective Zener clamp limiting voltage excursion to safe levels during ESD or surge events. Use Value: Sharp reverse knee and ≤0.04 μA leakage avoid loading sensitive sensor bridges while responding within nanoseconds. |
| Feedback Element in Linear Regulators | Reference Node in Power Supply Monitoring |
Use Scenario: Sets output voltage in discrete linear regulators (e.g., with pass transistor and error amplifier). IC Role / Device Role / Timing Role: Precision shunt reference defining regulated output via resistive divider feedback. Use Value: Tight 12.2–12.7 V tolerance and +6×10⁻⁴/K TC enable ±1 % output accuracy over –40 to +125 °C. |
Use Scenario: Supplies known reference voltage to comparator inputs monitoring DC bus voltage in embedded power systems. IC Role / Device Role / Timing Role: Stable voltage benchmark against which monitored rail is compared for fault detection. Use Value: High stability and low drift ensure reliable trip-point consistency across product lifetime and temperature cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C12-TR | Zener voltage 11.4–12.6 V at 5 mA; dynamic resistance 30 Ω; higher leakage (≤5 μA at 9.1 V) | Suitable for general-purpose regulation but less stable and noisier than TZX12D-TR | Select when cost sensitivity outweighs need for ultra-low leakage or long-term drift performance |
| 1N4742A-T | Zener voltage 11.4–12.6 V at 21 mA; dynamic resistance 9 Ω; power rating 1 W; DO-41 package | Higher power handling and lower ZZ, but larger footprint and different thermal profile | Choose for higher-current shunt regulation where board space permits DO-41 and thermal management is feasible |
Compared with BZX55C12-TR and 1N4742A-T, the TZX12D-TR offers superior stability, lower leakage, and smaller DO-35 footprint-making it optimal for space-constrained, low-power, high-accuracy reference designs where long-term calibration retention matters.
Availability
TZX12D-TR is available at Aetrix Electronics and suitable for voltage reference design, analog sensor signal conditioning, and overvoltage protection circuits requiring stable component supply, consistent parametric performance, and long-lifecycle availability.
Supply support for TZX12D-TR 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, optoelectronics, and passive components for industrial, automotive, and computing markets.
The TZX-Series is part of Vishay's precision small-signal Zener portfolio, engineered for voltage stabilization in analog circuits where low noise, sharp knee, and long-term stability are critical design requirements.
FAQ
What is the Zener voltage tolerance of TZX12D-TR at 5 mA test current?
The TZX12D-TR has a specified Zener voltage range of 12.2 V minimum to 12.7 V maximum at IZT = 5 mA, yielding a ±2.1 % tolerance about the nominal 12.45 V center point. This tight spread supports accurate voltage setting in feedback networks without trimming. The TZX12D-TR datasheet confirms this range under standard test conditions (Tamb = 25 °C).
Can TZX12D-TR be used in surface-mount designs?
No - the TZX12D-TR is packaged exclusively in the axial DO-35 (DO-204AH) through-hole format and is not available in SMD variants. Its leads require hole mounting and wave or hand soldering. For surface-mount alternatives, consider Vishay's SMAZ12 or BZX84-C12L, but note differences in ZZ, leakage, and thermal behavior versus the TZX12D-TR.
What is the maximum allowable Zener current for continuous operation of TZX12D-TR?
The maximum continuous Zener current for TZX12D-TR is derived from its 500 mW power rating and Zener voltage: IZ(max) ≈ Ptot/VZ(min) = 500 mW / 12.2 V ≈ 41 mA. However, derating is required above 25 °C ambient; at 75 °C, usable current drops to ~25 mA. Always consult the TZX12D-TR thermal derating curve (Fig. 2) for safe operation.
Does TZX12D-TR meet RoHS and REACH compliance?
Yes - the TZX12D-TR conforms to RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, as confirmed in Vishay's material declarations (Doc. #99912). Lead-free terminations and halogen-free molding compound are standard. Full compliance documentation is available upon request for the TZX12D-TR.
How does the temperature coefficient of TZX12D-TR affect its voltage reference accuracy?
The TZX12D-TR exhibits a typical temperature coefficient of +6 × 10⁻⁴/K near 12 V, meaning its Zener voltage increases by ~0.072 V over a 100 °C rise. In a –40 to +125 °C range, this contributes up to ±0.8 % drift. For high-accuracy applications, this must be compensated in system calibration - a key design consideration distinct to the TZX12D-TR's performance envelope.
TZX12D-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- TZX
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- -
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 35 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 9.5 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
TZX12D-TR FAQ
1.How can I place an order for TZX12D-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for TZX12D-TR 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 TZX12D-TR reliable?
The price and inventory of TZX12D-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TZX12D-TR is usually 5 days.
3.What payment methods are accepted for TZX12D-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TZX12D-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TZX12D-TR?
TZX12D-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TZX12D-TR 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 TZX12D-TR?
For technical support, including TZX12D-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TZX12D-TR requirements.
6.How does Aetrix verify that TZX12D-TR is sourced from the original manufacturer or authorized distributors?
All TZX12D-TR 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 TZX12D-TR meets industry standards.
7.What is the process for return or replacement of TZX12D-TR?
All TZX12D-TR units undergo pre-shipment inspection (PSI). If there is an issue with TZX12D-TR, 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 TZX12D-TR part is unused and in its original packaging.
Return procedure for TZX12D-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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