DTA144VKAT146

Overview

The DTA144VKAT146 is a PNP digital transistor manufactured by ROHM Semiconductor, featuring built-in bias resistors within a compact SOT-346 (TO-236) surface-mount package. It provides a maximum collector-emitter voltage of -50 V and a continuous collector current of -100 mA with a power dissipation rating of 200 mW. The device integrates an input resistor (R1) of 10 kΩ and an emitter-base resistor (R2) of 4.7 kΩ, resulting in a typical resistance ratio of approximately 2.1. It exhibits a minimum DC current gain (hFE) of 30 at specified test conditions and supports a maximum operating temperature of +150°C.

Feature Summary

• Integrates NPN/PNP transistor with dual internal resistors to simplify circuit design and reduce PCB footprint
• Provides stable switching performance with high thermal stability for reliable operation
• Designed for low-power applications with fast response characteristics suitable for signal driving

Applications

• Microcontroller I/O port interface and level shifting circuits
• Low-current switching and logic buffer applications
• Signal driving for LEDs, relays, or MOSFET gates in portable devices

Procurement Notes

Verify the specific suffix 'T146' to confirm the tape-and-reel packaging quantity and orientation, as these details are critical for automated assembly compatibility. Ensure that the component's status is reviewed against current design guidelines, as certain variants may be marked as not recommended for new designs depending on the manufacturer's lifecycle updates. Cross-reference the exact part number with official distributor catalogs to confirm availability and lead times prior to procurement.

Selection Notes

Select this component when a PNP digital transistor with a 10 kΩ input resistor and 4.7 kΩ base-emitter resistor is required. The SOT-346 package is suitable for space-constrained designs needing surface-mount technology. Verify that the -50 V voltage rating and -100 mA current capacity meet the load requirements. Consider the thermal dissipation limits of 200 mW when designing for high-duty-cycle operations or elevated ambient temperatures.

Part Context

This part belongs to the ROHM DTx series of digital transistors, which combine bipolar junction transistors with integrated bias resistors. The series offers various resistor combinations and polarities to standardize digital switching components. The DTA144VKA variant specifically denotes the PNP type with defined resistance values, facilitating consistent design practices across different circuit implementations.

Replacement Considerations

Check for direct pin-compatible substitutes within the same ROHM DTA144EKA family, such as DTA144EKAT146, noting differences in resistor ratios. Evaluate alternative manufacturers offering SOT-346 PNP digital transistors with similar -50V ratings and comparable R1/R2 values to ensure functional equivalence without redesigning the surrounding circuitry.