1N4914

Overview

The Microchip Technology 1N4914 is a temperature-compensated Zener diode designed for precision voltage regulation applications. It operates in the DO-7 (DO-35) through-hole package, providing a nominal Zener voltage of 12.8 V with a tight tolerance of 5%. The device supports a maximum power dissipation of 400 mW and maintains stable performance across an extended operating temperature range from -65°C to +175°C. Key electrical characteristics include a reverse leakage current of 15 µA and a Zener impedance of 25 Ohms at a test current of 7.5 mA. Its low voltage temperature coefficient ensures reliable operation in demanding environments.

Feature Summary

• Temperature compensated design for stable voltage reference
• Extended high-temperature capability up to 175°C
• Precision voltage tolerance for accurate regulation

Applications

• Precision voltage reference circuits
• Temperature-stable power supply regulation
• High-reliability industrial control systems

Procurement Notes

Verify the specific suffix or variant designation when ordering, as manufacturing sources may vary between Microchip and legacy suppliers like Microsemi. Confirm RoHS compliance status, as historical data indicates non-compliance for some versions. Ensure the procurement channel provides valid datasheets matching the exact part number to avoid discrepancies in electrical parameters such as Zener voltage and temperature coefficients.

Selection Notes

Select this component when a stable voltage reference is required under varying thermal conditions. The 12.8 V rating suits mid-range regulation needs where standard Zener diodes might drift significantly. Consider the 400 mW power rating for thermal management in compact designs. Verify that the DO-7 package fits the PCB layout constraints and that the 5% tolerance meets the circuit's accuracy requirements.

Part Context

The 1N4914 belongs to the family of temperature-compensated Zener diodes, distinct from standard Zener types by its optimized voltage stability over temperature. Manufactured by Microchip Technology, it inherits heritage from Microsemi's discrete semiconductor portfolio. This component serves critical roles in aerospace, defense, and industrial sectors where reliability and precise voltage referencing are mandatory under extreme environmental stress.

Replacement Considerations

Cross-reference with other temperature-compensated Zener diodes offering similar 12.8 V ratings and DO-7 packaging. Verify equivalent Zener impedance and temperature coefficients to ensure circuit compatibility. Check manufacturer-specific parameter variations if substituting with parts from different vendors.