1N457

Overview

The Fairchild Semiconductor 1N457 is a small signal switching diode designed for general-purpose applications. It features a DO-35 axial leaded package and supports through-hole mounting. Key electrical specifications include a peak reverse voltage of 70 V, a maximum forward current of 200 mA, and a surge current rating of 4 A. The device exhibits a forward voltage of 1 V and a low reverse leakage current of 25 nA. It operates within a temperature range of -65 °C to +175 °C.

Feature Summary

• High conductance characteristics with low leakage current
• Robust thermal performance supporting high junction temperatures
• Standardized DO-35 axial leaded form factor

Applications

• General purpose rectification circuits
• Small signal switching applications
• Protection against voltage transients

Procurement Notes

Verify the manufacturer origin, as onsemi also produces this part number following corporate acquisitions. Confirm the specific suffix indicates the correct packaging format, such as bulk or cut tape, to match assembly requirements. Ensure RoHS compliance status aligns with project regulations before finalizing procurement orders.

Selection Notes

Select this component when a standard silicon switching diode with moderate current handling is required. The 70 V reverse voltage rating suits low-voltage DC circuits. Consider the DO-35 package constraints for PCB layout space. Evaluate the 200 mA continuous current limit against circuit load demands to ensure reliable operation under steady-state conditions.

Part Context

This component belongs to the 1N45x series of germanium and silicon diodes historically used in early electronics. Fairchild Semiconductor manufactured variants of this standard JEDEC designation. The 1N457 specifically represents a silicon variant optimized for switching speeds compared to older rectifier types, maintaining compatibility with legacy designs requiring this specific voltage and current profile.

Replacement Considerations

Equivalent parts include the 1N914 and 1N4148 for similar switching functions, though voltage ratings may differ. Verify pinout compatibility and thermal dissipation capabilities when substituting.