1N4914A/TR

Overview

The 1N4914A/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 has a maximum power dissipation of 400 mW and a maximum Zener impedance (Zzt) of 25 Ohms at a test current of 7.5 mA. It operates within an extended temperature range from -65°C to +175°C. The component utilizes a DO-7 axial through-hole package.

Feature Summary

• Temperature compensated design for stable voltage regulation across wide thermal ranges
• High reliability construction suitable for demanding industrial and aerospace environments
• Low noise performance characteristics

Applications

• Precision voltage reference circuits requiring thermal stability
• Industrial control systems operating in extreme temperatures
• Aerospace and defense electronic instrumentation

Procurement Notes

Verify the specific suffix TR indicates reel packaging when sourcing. Confirm the manufacturer designation as Microchip Technology or its predecessor entities such as Microsemi, as part numbers may carry legacy branding. Ensure the voltage rating matches the 12.8 V specification required for the application design.

Selection Notes

Select this component when a stable 12.8 V reference is needed under varying thermal conditions. The DO-7 package requires through-hole mounting. Compare against standard Zener diodes if temperature compensation is not critical, noting that this variant offers superior thermal stability at the cost of potentially higher impedance compared to lower voltage types.

Part Context

This part belongs to the 1N49xx series of temperature-compensated Zener diodes produced by Microchip Technology. These devices are engineered to minimize voltage drift over temperature, making them distinct from standard Zener regulators. The series supports high-reliability applications where environmental stability is a primary design constraint.

Replacement Considerations

Check for direct equivalents in the 1N491x series with identical voltage ratings. Verify that any substitute maintains the same DO-7 package dimensions and thermal compensation characteristics to ensure circuit compatibility.