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1N4903/TR
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Product Detailed Parameters
- Description：DIODE ZENER 12.8V 400MW DO7
- Series：-
- Mfr：Microchip Technology
- Package：Tape & Reel (TR)
- Voltage - Zener (Nom) (Vz)：12.8 V
- Tolerance：±5%
- Power - Max：400 mW
- Impedance (Max) (Zzt)：200 Ohms
- Current - Reverse Leakage @ Vr：-
- Operating Temperature：-25°C ~ 100°C
- Mounting Type：Through Hole
- Package / Case：DO-204AA, DO-7, Axial
- Voltage - Forward (Vf) (Max) @ If：-
- Grade：-
- Qualification：-
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Overview
The Microchip Technology 1N4903/TR is a temperature compensated Zener diode designed for precision voltage regulation. It features a nominal Zener voltage of 12.8 V with a tight tolerance of 5%. The device operates in the DO-7-2 axial through-hole package and dissipates up to 400 mW. Key electrical parameters include a maximum reverse leakage current of 15 uA, a Zener impedance of 100 Ohms, and a test current of 2 mA. It maintains functionality across an extended temperature range from -65 C to +175 C.
Feature Summary
- Temperature compensated design ensures stable voltage regulation across varying thermal conditions.
- High reliability construction supports operation in extreme environmental temperatures.
- Precision voltage tolerance provides consistent performance for sensitive circuit applications.
Applications
- Precision voltage reference circuits requiring thermal stability
- Overvoltage protection in industrial control systems
- Test and measurement equipment calibration references
Procurement Notes
Verify component authenticity by checking manufacturer markings against official datasheet specifications. Confirm package type matches DO-7-2 requirements. Ensure operating temperature range aligns with system constraints. Validate Zener voltage tolerance meets circuit design specifications before integration into production assemblies.
Selection Notes
Select this component when precise voltage regulation under thermal variation is critical. The temperature compensation feature distinguishes it from standard Zener diodes. Verify that the 400 mW power dissipation rating suits the application's thermal management capabilities. Consider the axial leaded package for through-hole mounting compatibility.
Part Context
This part belongs to Microchip's temperature compensated Zener diode series. These components are engineered for applications demanding high stability. The 1N4903 variant specifically targets the 12.8 V regulation niche. It complements other precision diodes in the manufacturer's portfolio for robust electronic design solutions.
Replacement Considerations
Consult official substitution guides for parameter-equivalent alternatives. Verify that any replacement maintains identical temperature compensation characteristics and voltage tolerance. Ensure physical package compatibility with existing PCB layouts.
