1N4900A

Overview

The 1N4900A is a Zener diode manufactured by Microchip Technology, designed for voltage regulation applications. 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 of 200 Ohms. It operates within a temperature range of -55°C to +100°C and utilizes a DO-7 axial through-hole package.

Feature Summary

• Provides stable voltage regulation at a nominal 12.8 V level
• Constructed in a standard DO-7 axial leaded package for through-hole mounting
• Rated for continuous power dissipation up to 400 mW
• Maintains performance across an extended industrial temperature range

Applications

• General-purpose voltage reference circuits
• Overvoltage protection stages
• Biasing networks in analog signal processing

Procurement Notes

Verify the specific manufacturer lot code and date code upon receipt to ensure compliance with project requirements. Confirm that the component matches the DO-7 package dimensions and electrical specifications listed in the official datasheet. Check for any physical damage to leads or casing before integration into the assembly process.

Selection Notes

Select this component when a precise 12.8 V reference is required in a low-power through-hole design. Consider the 400 mW power limit and thermal management needs in the final enclosure. Ensure the ±5% tolerance aligns with the circuit's accuracy requirements compared to tighter tolerance alternatives.

Part Context

This part belongs to the 1N49xx series of Zener diodes produced by Microchip Technology. It serves as a discrete semiconductor solution for maintaining constant voltage levels in electronic circuits. The DO-7 package offers a compact form factor suitable for various printed circuit board layouts requiring axial components.

Replacement Considerations

Cross-reference with other manufacturers offering 12.8 V Zener diodes in DO-7 packages. Verify that substitute parts meet the same 400 mW power rating and ±5% voltage tolerance. Ensure thermal characteristics and impedance values are compatible with the existing circuit design.