1N458A

Overview

The Microchip Technology 1N458A is a high conductance, low leakage signal diode housed in the DO-35 axial leaded package. It features a maximum repetitive peak reverse voltage of 150 V and an average forward rectified current of 150 mA. The device exhibits a maximum DC reverse current of 25 µA at rated voltage and a typical forward voltage drop of 1 V at specified currents. It supports a maximum surge current of 4 A and operates within a temperature range from -65 °C to +175 °C.

Feature Summary

• High conductance characteristics for efficient signal switching
• Low leakage current performance under reverse bias conditions
• Robust thermal stability with extended operating temperature range

Applications

• General purpose signal rectification
• Computer logic interface circuits
• Small signal switching applications

Procurement Notes

Verify the specific manufacturer source, as this part number is produced by multiple vendors including Microchip, onsemi, and formerly Fairchild or National Semiconductor. Confirm RoHS compliance status and package variant (DO-35) against your bill of materials. Check for obsolete status indicators if sourcing from legacy distributors, as production availability varies significantly by supplier.

Selection Notes

Select this component when a standard silicon signal diode with 150 V reverse voltage capability is required. Ensure the circuit design accommodates the 150 mA average forward current limit. Verify that the DO-35 through-hole package fits the PCB layout constraints. Consider the 25 µA reverse leakage specification for high-impedance input stages.

Part Context

This component belongs to the standard 1N4xxx series of glass-passivated silicon junction rectifiers. These devices are widely used in general-purpose electronics for signal processing and protection. The 1N458A specifically denotes the 150 V rating variant within this family, sharing pinouts and mechanical dimensions with other ratings in the series.

Replacement Considerations

Direct substitutes include the 1N914 and 1N4148, though these typically have lower voltage ratings (100 V). For identical specifications, verify equivalents such as the 1N4448 or generic 1N458A parts from other manufacturers like Nexperia or Vishay, ensuring voltage and current ratings match.