1N4905/TR

Overview

The 1N4905/TR is a temperature-compensated Zener diode manufactured by Microchip Technology. It features a nominal Zener voltage of 12.8 V with a tolerance of 5%. The device operates in the DO-7-2 axial package, supporting through-hole mounting. Key electrical parameters include a maximum reverse leakage current of 15 uA and a Zener impedance of 100 Ohms at a test current of 2 mA. Power dissipation is rated at 400 mW. The component functions within an extended temperature range from -65 C to +175 C.

Feature Summary

• Temperature compensated design for stable voltage regulation across varying thermal conditions
• Single configuration optimized for precision reference applications
• High-temperature capability suitable for demanding operational environments

Applications

• Precision voltage reference circuits requiring low temperature drift
• Overvoltage protection in sensitive electronic systems
• Voltage regulation in industrial control equipment

Procurement Notes

Verify the specific suffix TR indicates reel packaging when confirming orders. Ensure compatibility with through-hole assembly processes given the DO-7-2 form factor. Confirm RoHS status as non-compliant based on available documentation before integration into regulated assemblies. Validate that the 12.8 V rating aligns with circuit requirements.

Selection Notes

Select this component when a stable 12.8 V reference is required with minimal temperature coefficient. The 400 mW power rating suits low-current applications. Compare against standard Zener diodes if temperature stability is critical. Ensure the 100 Ohm impedance meets noise and dynamic response specifications for the target application.

Part Context

This part belongs to Microchip's discrete diode portfolio, specifically within the Zener diode category. It utilizes the standard 1N49xx numbering convention adapted for temperature compensation. The TR suffix denotes tape and reel packaging for automated insertion. It serves as a specialized variant within the broader family of voltage regulator diodes offered by the manufacturer.

Replacement Considerations

Direct substitutes must match the 12.8 V Zener voltage, 5% tolerance, and temperature-compensated characteristics. Verify equivalent power dissipation and package dimensions for mechanical fit. Cross-reference with other manufacturers offering temperature-stable Zener diodes in the DO-7-2 package.