DTC943TUBTL

Overview

The DTC943TUBTL is a single NPN digital transistor manufactured by ROHM Semiconductor, featuring built-in bias resistors for simplified circuit design. It operates with a maximum collector-emitter voltage of 20 V and supports a continuous collector current of 400 mA. The device has a power dissipation rating of 200 mW and a maximum operating frequency of 35 MHz. It utilizes an SMD/SMT mounting style in a UMT3F package (SOT-323FL-3). The typical input resistor value is 4.7 kOhms, and the component can withstand a maximum operating temperature of +150°C.

Feature Summary

• Integrates NPN bipolar transistor with built-in bias resistors to reduce external component count
• Designed for surface mount applications using compact UMT3F packaging
• Supports high-temperature operation up to 150°C for robust performance

Applications

• General-purpose switching circuits requiring pre-biased configuration
• Logic interface circuits between microcontrollers and loads
• Driver stages for low-power signal processing

Procurement Notes

Verify the specific suffix 'TL' against the manufacturer's official datasheet to confirm tape-and-reel packaging specifications and binning details. Ensure that the UMT3F package dimensions match the target PCB footprint requirements. Cross-reference the electrical parameters, particularly the 20V VCEO and 400mA IC limits, with the system's worst-case operating conditions to guarantee reliability under thermal stress.

Selection Notes

Select this component when a single NPN digital transistor with a 4.7 kOhm input resistor is required in a small surface-mount form factor. It is suitable for designs prioritizing board space efficiency and simplified biasing networks. Consider the 35 MHz frequency limit and 200 mW power dissipation constraints when evaluating suitability for high-speed or high-power switching applications compared to higher-rated alternatives.

Part Context

This part belongs to the DTC943TUB series of digital transistors from ROHM Semiconductor. These components are categorized as pre-biased bipolar junction transistors (BJTs) designed to replace discrete resistor-transistor combinations. The series offers various configurations and resistor values to accommodate different logic levels and drive requirements within compact electronic systems.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with direct replacements by matching the NPN polarity, 20V VCEO rating, 400mA current capacity, and UMT3F package outline.