1N4897

Overview

The Microchip Technology 1N4897 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-35 axial leaded package, suitable for through-hole mounting. It has a maximum power dissipation of 400 mW and a test current of 10 mA. The component functions within a junction temperature range of -65°C to +175°C, ensuring stability across wide thermal variations.

Feature Summary

• Temperature compensated design for stable voltage reference
• Precision Zener voltage regulation at 12.8 V
• Robust operation across extended industrial temperature ranges

Applications

• Precision voltage reference circuits
• Temperature-stable power supply regulation
• Voltage protection in sensitive electronic systems

Procurement Notes

Verify the specific suffix (e.g., /TR) to confirm packaging type, as standard 1N4897 units may differ from tape-and-reel variants. Confirm RoHS compliance status, as some listings indicate non-compliance. Ensure the supplier provides official Microchip datasheets to validate the temperature compensation characteristics and electrical limits before integration into critical designs.

Selection Notes

Select this component when a stable voltage reference is required under varying thermal conditions. The 12.8 V rating suits applications needing precise regulation above common low-voltage references. Consider the DO-35 package constraints for PCB layout. Verify that the 400 mW power dissipation meets the circuit's thermal requirements without excessive heat sinking.

Part Context

This part belongs to Microchip’s legacy Zener diode portfolio, often used in industrial and automotive electronics where long-term availability and thermal stability are prioritized. The 1N4897 variant specifically addresses drift issues found in standard Zener diodes, making it suitable for high-precision analog signal conditioning and reference applications.

Replacement Considerations

Check for direct equivalents such as other 12.8 V temperature-compensated Zener diodes from manufacturers like ON Semiconductor or Vishay. Ensure substitute parts match the DO-35 footprint and maintain similar thermal coefficients. Verify that alternative components offer comparable impedance and power ratings to avoid redesigning surrounding circuitry.