4N46

Transistor, Photovoltaic Output Optoisolators Overview

The Broadcom Limited 4N46 is a discontinued single-channel optoisolator featuring a Darlington transistor output with an accessible base terminal. It provides a high isolation voltage of 3750Vrms and operates within a temperature range of -40°C to 85°C. The device supports a maximum DC forward current of 20mA and delivers an output current of up to 60mA. Key electrical parameters include a typical forward voltage of 1.4V, a minimum current transfer ratio of 200% at 10mA, and switching times of 5µs (on) and 150µs (off). It is housed in a 6-DIP through-hole package.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• Integrates a Darlington phototransistor output stage for high gain amplification
• Includes a dedicated base terminal to allow external control over response speed and sensitivity
• Provides robust galvanic isolation rated at 3750Vrms between input and output circuits

Transistor, Photovoltaic Output Optoisolators Applications

• General-purpose digital signal isolation in industrial control systems
• Interface circuits requiring high current transfer ratios
• Power supply feedback loops for isolated voltage regulation

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify component authenticity carefully as the 4N46 is officially obsolete and no longer manufactured by Broadcom Limited. Sourced units may be surplus stock or from secondary markets. Confirm RoHS compliance status, as original specifications indicate non-compliance. Validate datasheet revisions and marking labels against official Product Change Notices before integration into new designs.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select this component only for legacy system maintenance or repair where specific pinouts and electrical characteristics are mandatory. The accessible base terminal offers unique flexibility for adjusting switching speeds compared to standard Darlington outputs. Ensure design requirements align with the specified operating temperature range and isolation voltage ratings.

Transistor, Photovoltaic Output Optoisolators Part Context

The 4N46 belongs to the Broadcom 4N series of optocouplers, which are widely recognized for their reliability in general-purpose isolation applications. This series typically features Darlington outputs for high current gain. The 4N46 specifically distinguishes itself by providing a base connection, allowing designers to mitigate storage time delays inherent in Darlington structures.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

Public confirmed substitute part numbers include 6N138-500E from Broadcom Limited. Verify pin compatibility and electrical parameter equivalence before substitution. Note that alternative devices may differ in package dimensions or switching characteristics.