1N2845A

Overview

The 1N2845A is a Zener diode manufactured by Microchip Technology, designed for voltage regulation applications. It features a nominal Zener voltage of 110V and a maximum power dissipation of 1W at specified temperatures. The device utilizes a DO-41 axial leaded package, suitable for through-hole mounting on printed circuit boards. Key electrical characteristics include a test current of 110mA and a dynamic impedance of 30 ohms at the test point. It operates within a standard temperature range, providing stable voltage reference capabilities in general-purpose electronic circuits requiring precise voltage clamping or regulation.

Feature Summary

• Provides stable voltage regulation with a nominal 110V Zener breakdown voltage
• Capable of handling 1W power dissipation for robust performance in linear regulation tasks
• Features low dynamic impedance (30 ohms) to maintain consistent voltage under varying load conditions
• Utilizes an axial leaded package design for reliable through-hole integration

Applications

• Voltage reference circuits requiring stable 110V levels
• Overvoltage protection stages in power supply inputs
• Linear voltage regulator designs using Zener shunt configurations
• Clamping circuits for transient voltage suppression

Procurement Notes

Verify the specific suffix codes against the official Microchip datasheet to ensure correct tolerance and thermal rating specifications. Confirm that the procurement channel provides genuine components with traceability documentation. Check for RoHS compliance status if required by your manufacturing standards. Ensure the ordering quantity aligns with the manufacturer's minimum order requirements and packaging formats. Validate the component date code to avoid obsolete stock.

Selection Notes

Select the 1N2845A when a precise 110V reference is needed in through-hole designs. Consider its 1W power rating to ensure adequate heat dissipation without external heatsinks in most ambient conditions. Evaluate the 30-ohm dynamic impedance to determine suitability for noise-sensitive applications. Compare its axial package dimensions against available PCB real estate. Assess the operating temperature range against the environmental conditions of the final assembly.

Part Context

The 1N2845A belongs to Microchip Technology's discrete semiconductor portfolio, specifically within the Zener diode category. This series is engineered for general-purpose voltage regulation and reference applications. As a legacy part number, it represents a standard axial-leaded component widely used in industrial and consumer electronics. Its inclusion in the Microchip lineup ensures compatibility with established design practices relying on proven Zener technology for cost-effective voltage control solutions.

Replacement Considerations

Consult the official Microchip datasheet for direct pin-compatible alternatives with identical voltage and power ratings. Verify that any substitute maintains the same 110V Zener voltage and 1W dissipation capability. Ensure the replacement package matches the DO-41 axial form factor for board compatibility. Cross-reference dynamic impedance values to guarantee equivalent regulation performance.