DTA124TKAT146

Overview

The DTA124TKAT146 is a PNP digital transistor manufactured by ROHM Semiconductor, featuring built-in biasing resistors to simplify circuit design. It operates with a maximum collector-emitter voltage of -50 V and a continuous collector current of -100 mA. The device incorporates an input resistor (R1) of 10 kΩ and an emitter-base resistor (R2) of 47 kΩ, resulting in a typical resistance ratio of approximately 4.7. It is housed in a compact SOT-346 (TO-236AB) surface-mount package with three terminals. The component supports a maximum power dissipation of 200 mW and functions within a storage temperature range of -55 °C to +150 °C.

Feature Summary

• Integrates PNP bipolar junction transistor with dual internal resistors for direct logic interfacing
• Eliminates external base resistor requirements, reducing printed circuit board space and component count
• Provides standardized electrical characteristics suitable for inverter and driver applications

Applications

• Logic level inversion circuits
• Interface driving between microcontrollers and peripheral devices
• General-purpose switching applications in consumer electronics

Procurement Notes

Verify the specific suffix 'T146' against official ROHM documentation to confirm tape-and-reel packaging specifications and quantity per reel. Ensure compatibility with standard SMT assembly processes for the SOT-346 footprint. Cross-reference the part number with authorized distributors to confirm current production status and availability, as digital transistor series may undergo lifecycle changes or obsolescence notices without immediate public announcement.

Selection Notes

Select this component when a PNP configuration with high input impedance is required for noise immunity. The 10 kΩ input resistor limits base current effectively while maintaining adequate drive capability for the specified load. Compare the 47 kΩ emitter-base resistor value against alternatives like the DTA124EKAT146 if different biasing ratios are needed for specific threshold voltages. Ensure the thermal management strategy accounts for the 200 mW power dissipation limit in the enclosed SOT-346 package.

Part Context

This part belongs to the ROHM DTA124 series of pre-biased transistors, designed to replace discrete resistor-transistor combinations. The 'T146' suffix typically denotes the specific taping quantity and packaging format used for automated surface-mount assembly. It shares the same functional core as other variants in the DTA124 family but differs in internal resistor values and physical packaging dimensions compared to SOT-23 or SC-59 equivalents.

Replacement Considerations

Direct substitutes include the DTA124EKA series for similar PNP functionality with different resistor ratios. Verify pinout compatibility between SOT-346 and alternative packages before substitution. Check datasheets for matching VCEO and IC ratings to ensure electrical equivalence in the target application.