1N4904/TR

Overview

The Microchip Technology 1N4904/TR is a temperature compensated Zener diode designed for precision voltage regulation. It features a nominal Zener voltage of 12.8 V with a tolerance of ±5%. The device operates in the DO-7 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. The voltage temperature coefficient is specified at 0.005 %/C. It supports an operating temperature range from -65°C to +175°C and is supplied in reel packaging.

Feature Summary

• Temperature compensation ensures stable voltage regulation across varying thermal conditions.
• High reliability construction suitable for demanding industrial and aerospace environments.
• Low leakage current characteristics minimize power loss and improve circuit efficiency.

Applications

• Precision voltage reference circuits requiring low temperature drift
• Industrial control systems and instrumentation
• Aerospace and defense electronic assemblies

Procurement Notes

Verify the specific suffix configuration against official datasheets to confirm package type and testing standards. Ensure compatibility with existing PCB footprints for the DO-7 axial leaded format. Confirm that the reel quantity meets production requirements without necessitating partial spool handling. Cross-reference the manufacturer part number with authorized distributor catalogs to validate authenticity and traceability before finalizing procurement orders.

Selection Notes

Select this component when precise voltage stability over a wide temperature range is critical. The 12.8 V rating suits applications needing regulation near standard logic or analog thresholds. Consider the 400 mW power dissipation limit for thermal management planning. The axial through-hole package facilitates manual assembly or wave soldering processes where surface mount alternatives are unsuitable.

Part Context

This component belongs to the 1N49xx series of temperature compensated Zener diodes manufactured by Microchip Technology. These devices utilize specialized doping profiles to achieve near-zero voltage temperature coefficients around the breakdown voltage. The series is widely recognized for high-reliability performance in harsh environments, distinguishing it from standard general-purpose Zener diodes used in less critical consumer electronics.

Replacement Considerations

Direct substitutes include the 1N4905/TR and 1N4913/TR, which share identical 12.8 V ratings and temperature compensation characteristics. Verify pinout compatibility and power dissipation limits when evaluating alternative manufacturers' equivalents to ensure seamless integration into existing designs.