MUN2235T1G

Overview

The MUN2235T1G is a single NPN Digital Transistor (BRT) from onsemi, designed to replace discrete transistor and resistor networks. It integrates a monolithic bias network consisting of a 2.2 kOhm base resistor (R1) and a 47 kOhm emitter resistor (R2), yielding a typical resistance ratio of 0.047. The device operates with a maximum collector-emitter voltage (VCEO) of 50 V and supports a continuous collector current of 100 mA. It features a minimum DC current gain (hFE) of 80 at 5 mA and 10 V. Power dissipation is rated at 230 mW in the SC-59 (SOT-23-3) surface-mount package. The component functions within an ambient temperature range of -55°C to +150°C.

Feature Summary

• Integrates a monolithic bias network with a series base resistor and base-emitter resistor to simplify circuit design.
• Reduces board space and component count by replacing multiple discrete components with a single SMD device.
• Provides consistent switching performance through integrated biasing for reliable digital logic interfacing.

Applications

• General-purpose switching applications in consumer electronics.
• Driver circuits for low-power loads such as LEDs or relays.
• Logic level shifting and interface buffering between microcontrollers and peripheral devices.

Procurement Notes

Verify the specific ordering suffix 'T1G' to confirm the tape-and-reel packaging format and lead-free compliance status. Ensure the SC-59 footprint matches the target PCB layout. Confirm that the 2.2 kOhm base resistance aligns with the required drive current capabilities of the upstream logic source before finalizing procurement.

Selection Notes

Select this component when a single NPN switch with moderate base drive requirements is needed. The 2.2 kOhm internal resistor suits applications driven by standard logic outputs without excessive loading. Compare against MUN2233T1G if higher input impedance is required, or NSVMUN2236T1G if different resistance ratios are necessary. Verify thermal constraints given the 230 mW power dissipation limit in the small outline package.

Part Context

This part belongs to the MUN2235 family of Bias Resistor Transistors. It shares functional characteristics with MUN5235DW1T1G but differs in configuration; the latter is a dual NPN unit in an SOT-363 package. The MUN2235T1G serves as a direct replacement for discrete BJT/resistor combinations in space-constrained designs requiring simplified biasing networks.

Replacement Considerations

MUN2235LT1G offers similar electrical characteristics but may differ in automotive qualification status. NSVMMUN2235LT1G includes the NSV prefix indicating specific site control and AEC-Q101 qualification. Verify package compatibility and resistance values when substituting with cross-brand equivalents like DTC123Jxx series.