1N4149-1

Single Diodes Overview

The Microchip Technology 1N4149-1 is a JEDEC registered small signal switching diode featuring hermetically sealed glass construction and metallurgical bonding within a double-plug DO-35 package. It operates with a maximum working peak reverse voltage of 75 V and an average rectified forward current of 200 mA. The device exhibits a maximum junction capacitance of 4 pF at 0 V bias and a reverse recovery time of 4 ns at 10 mA. Electrical characteristics include a maximum forward voltage of 1.0 V at 20 mA and a maximum reverse leakage current of 25 nA at the rated voltage.

Single Diodes Feature Summary

• Hermetically sealed glass construction with metallurgically bonded internal structure
• Very fast switching speeds with minimal reverse recovery times
• Low capacitance design suitable for high-frequency applications
• Screening available in reference to MIL-PRF-19500

Single Diodes Applications

• High frequency data lines
• RS-232 & RS-422 interface networks
• Ethernet 10 Base T
• Switching core drivers
• Computers and peripheral equipment

Single Diodes Procurement Notes

Verify specific ordering suffixes such as e3 for RoHS compliance or MQ/MX/MV/MSP for reliability levels against MIL-PRF-19500 requirements. Confirm terminal plating options, including tin/lead or matte-tin over copper clad steel, prior to procurement. Ensure the selected variant matches the required screening level and packaging configuration for the intended deployment environment.

Single Diodes Selection Notes

Select this component for designs requiring fast switching performance and low parasitic capacitance in through-hole layouts. The 75 V rating supports standard logic and interface signaling. Consider the 4 ns recovery time for high-speed digital circuits. Verify thermal limits, noting the junction temperature range extends up to +150 °C, ensuring compatibility with the system's operating conditions.

Single Diodes Part Context

This part belongs to the 1N4149 series of computer switching diodes manufactured by Microchip Technology (formerly Microsemi). It utilizes a DO-35 axial leaded package designed for high-density mounting. The device is distinct from general-purpose rectifiers due to its optimized speed and low capacitance characteristics tailored for signal processing and high-frequency switching tasks.

Single Diodes Replacement Considerations

Compatible substitutes within the same family include the 1N4151-1 and 1N4446-1. These variants share similar electrical profiles but may differ in reverse recovery time or forward voltage specifications. Verify that any replacement maintains the required hermetic sealing and package dimensions for mechanical fit.