MMUN2241LT1G

Overview

The MMUN2241LT1G is a Bias Resistor Transistor (BRT) manufactured by onsemi, featuring an integrated NPN silicon transistor with a monolithic bias network. It operates with a collector-emitter voltage of 50 V and a continuous collector current of 100 mA. The device includes a typical base resistor (R1) of 47 kOhms and an emitter resistor (R2) of 47 kOhms. Packaged in a surface-mount SOT-23-3 case, it dissipates up to 246 mW and functions within a temperature range of -55°C to +150°C.

Feature Summary

• Integrates a single NPN transistor with dual bias resistors to replace discrete components
• Reduces printed circuit board space and simplifies circuit design through component consolidation
• Provides consistent electrical performance via monolithic resistor network integration

Applications

• General-purpose switching applications requiring simplified bias networks
• Interface circuits for logic families needing level shifting or buffering
• Driver stages for relays, lamps, and solenoids

Procurement Notes

Verify the specific suffix LT1G against official onsemi documentation to confirm package type and compliance status. Ensure the ordering part number matches the required resistance values and polarity. Cross-reference the manufacturer's latest datasheet revision to confirm active status and any recent material declarations before finalizing procurement orders.

Selection Notes

Select this component when a pre-biased NPN solution is required to minimize external passive components. Verify that the 47 kOhm internal resistance values align with the target logic drive levels. Confirm that the SOT-23-3 footprint fits the available board space constraints and that the thermal dissipation requirements are met under maximum operating conditions.

Part Context

This part belongs to the MMUN series of digital transistors from onsemi, designed to simplify analog and digital circuit designs. It replaces traditional discrete transistor and resistor combinations, offering a compact alternative for biasing applications. The series is widely used in consumer electronics and industrial control systems where space efficiency and assembly cost reduction are critical priorities.

Replacement Considerations

Direct substitutes include other BRTs with identical NPN polarity, 50V rating, 100mA current, and matching 47k/47k resistor ratios. Verify pinout compatibility and thermal characteristics when considering alternatives from different manufacturers.