MUN2237T1G

Overview

The MUN2237T1G is a discontinued single NPN Bias Resistor Transistor (BRT) in an SC-59 package. It integrates a transistor with monolithic bias resistors R1=47 kΩ and R2=22 kΩ. Key electrical parameters include a collector-emitter voltage of 50 Vdc, continuous collector current of 100 mAdc, and minimum DC current gain of 80 at 5.0 mA. The device operates within a junction temperature range of -55°C to +150°C.

Feature Summary

• Integrates a single NPN transistor with a monolithic bias resistor network consisting of series base and base-emitter resistors.
• Designed to replace discrete devices and external resistor bias networks to reduce system cost and board space.

Applications

• General-purpose switching applications
• Driver circuits for relays and solenoids
• Logic level translation

Procurement Notes

This component is officially listed as discontinued by the manufacturer. Availability is restricted to existing stock or surplus channels. Verify end-of-life status and obsolescence notices directly with authorized distributors before initiating procurement processes.

Selection Notes

Select this part only if the specific 47 kΩ input resistance and 22 kΩ base-emitter resistance match the circuit requirements. Note that the SC-59 package is larger than modern alternatives like SOT-23. Confirm that the discontinuation status does not conflict with long-term production lifecycle requirements.

Part Context

The MUN2237T1G belongs to the DTC144W family of digital transistors. It shares identical internal circuitry with variants such as MMUN2237LT1G (SOT-23), MUN5237T1G (SC-70/SOT-323), and DTC144WE (SC-75). These parts offer different packaging options while maintaining the same electrical characteristics.

Replacement Considerations

Direct functional substitutes include NSVMUN2237T1G (automotive qualified, SC-59) and NSVMMUN2237LT1G (automotive qualified, SOT-23). Other pin-compatible packages from the same datasheet include MUN5237T1G (SC-70) and DTC144WE (SC-75).