SMUN5233T1G

Overview

The SMUN5233T1G is a single NPN Bias Resistor Transistor (BRT) from onsemi, packaged in the SC-70/SOT-323 form factor. It integrates a monolithic bias network consisting of a series base resistor and a base-emitter resistor to replace discrete components. Key electrical parameters include a maximum collector-emitter voltage (VCEO) of 50 Vdc and a continuous collector current (IC) of 100 mAdc. The device features a typical input resistor (R1) value of 4.7 kOhms with a resistor ratio (R1/R2) of 0.1. Thermal characteristics specify a total device dissipation of 202 mW at 25°C ambient temperature.

Feature Summary

• Integrates a single transistor with a monolithic bias network comprising two resistors to eliminate external components.
• Designed to simplify circuit design while reducing overall board space and component count.
• Compliant with RoHS standards and manufactured using lead-free, halogen-free processes.

Applications

• Replacing discrete transistor and resistor networks in low-power surface mount applications.
• Space-constrained digital logic circuits requiring simplified biasing.
• Automotive and industrial systems utilizing AEC-Q101 qualified variants.

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and shipping configuration. Confirm that the selected variant meets all necessary automotive qualification requirements if applicable. Ensure compatibility with standard surface mount assembly processes for the SC-70 package.

Selection Notes

Select this component when a compact NPN switching solution with integrated biasing is required. The 4.7 kOhm input resistance and 0.1 resistor ratio define the drive characteristics. Consider thermal derating curves for high-temperature environments to ensure power dissipation limits are not exceeded during operation.

Part Context

This part belongs to the MUN5233 series of digital transistors. It shares functional similarities with other BRTs like the MUN2233T1G but differs in packaging and specific resistor values. The SC-70 package offers a smaller footprint compared to SOT-23 alternatives, making it suitable for dense PCB layouts.

Replacement Considerations

Direct substitutes within the same family include the MUN5233T1G in different shipping configurations. Cross-family replacements such as the DTC143ZE may require verification of pinout compatibility and resistor tolerance alignment.