1N4901A/TR

Overview

The Microchip Technology 1N4901A/TR is a temperature-compensated Zener diode designed for precision voltage regulation. It features a nominal Zener voltage of 12.8 V with a tight tolerance of ±5%. The device operates in the DO-7 (DO-204AA) axial through-hole package, dissipating up to 400 mW. Key electrical parameters include a maximum reverse leakage current of 15 µA and a Zener impedance of 200 Ohms at a test current of 1 mA. It supports an extended operating temperature range from -65°C to +175°C, ensuring stability in demanding environments.

Feature Summary

• Temperature compensated design for stable voltage regulation across wide thermal ranges
• Precision voltage tolerance of ±5% for accurate reference applications
• Robust axial leaded construction suitable for through-hole mounting

Applications

• Precision voltage reference circuits requiring low drift
• Overvoltage protection in sensitive electronic systems
• Temperature-stable regulator designs in industrial equipment

Procurement Notes

Verify the specific suffix TR indicates tape and reel packaging when ordering. Confirm RoHS compliance status as documentation may vary by region or revision. Ensure the DO-7 package dimensions match your PCB footprint requirements. Cross-reference the manufacturer part number with official datasheets to confirm electrical specifications before integration into final designs.

Selection Notes

Select this component when high thermal stability is critical compared to standard Zener diodes. The 12.8 V rating suits applications needing precise mid-range voltage references. Consider the 400 mW power dissipation limit for thermal management. The axial package requires adequate spacing on the board layout. Verify that the 200 Ohm impedance meets the noise and regulation requirements of the target circuit.

Part Context

This part belongs to Microchip's family of temperature-compensated Zener diodes, which utilize specific doping profiles to minimize voltage drift with temperature changes. These devices are engineered for superior performance over standard general-purpose Zeners, making them suitable for high-reliability analog circuits where voltage accuracy must be maintained despite environmental fluctuations.

Replacement Considerations

Direct substitutes include other temperature-compensated Zener diodes with similar 12.8 V ratings and ±5% tolerance. Verify package compatibility with DO-7 axial leads. Check that replacement parts offer comparable power dissipation and leakage current specifications to maintain circuit performance integrity.