SMUN5211T3G

Overview

The SMUN5211T3G is an NPN Bias Resistor Transistor (BRT) manufactured by onsemi, housed in a SOT-323 (SC-70) surface-mount package. It integrates a single transistor with a monolithic bias network consisting of two resistors: a series base resistor and a base-emitter resistor. Key electrical parameters include a maximum collector current of 100 mA, a collector-emitter voltage rating of 50 V, and a typical input resistance of 10 kΩ. The device features a power dissipation capacity of 230 mW and operates within a temperature range of -55°C to +150°C.

Feature Summary

• Integrates a single NPN transistor with a monolithic bias resistor network to replace discrete components.
• Designed for low-power surface mount applications where board space is limited.
• Simplifies circuit design by eliminating the need for external biasing resistors.

Applications

• Low-power surface mount circuits requiring compact component footprints.
• Digital logic interface applications utilizing pre-biased switching.
• General-purpose switching tasks in consumer electronics.

Procurement Notes

Verify the specific suffix T3G against official datasheets to confirm packaging details such as reel or cut tape specifications. Ensure compatibility with standard SMT reflow processes for the SOT-323 package. Cross-reference manufacturer part numbers with distributor listings to confirm availability and authenticity before procurement.

Selection Notes

Select this component when a compact NPN switch with integrated biasing is required. Compare the 10 kΩ input resistance against other MUN series variants like SMUN5212T1G which uses 22 kΩ. Evaluate thermal constraints given the 230 mW dissipation limit in the small SC-70 package. Confirm that the 50V rating meets the circuit's voltage requirements.

Part Context

This component belongs to the MUN5211 series of digital transistors from onsemi. These devices are engineered to reduce system cost and board area by combining a transistor and bias resistors into one package. The SOT-323 form factor makes it suitable for portable and space-constrained electronic designs compared to larger through-hole alternatives.

Replacement Considerations

SMUN5212T1G offers similar functionality but with a different typical input resistance value. Other manufacturers produce equivalent BRTs in the SOT-323 package; verify pinout and electrical characteristics match before substitution.