DTA125TKAT146

Overview

The DTA125TKAT146 is a single NPN digital transistor manufactured by ROHM Semiconductor, housed in an SMT3 (SOT-346/SC-59) surface-mount package. It integrates a built-in input resistor and emitter-base resistor to simplify circuit design. Key electrical parameters include a maximum collector-emitter voltage of 50 V and a continuous collector current of 100 mA. The device features a minimum DC current gain (hFE) of 100 at 1 mA and 5 V, with a power dissipation rating of 200 mW. It operates within a temperature range of -55 °C to +150 °C and has a transition frequency of 250 MHz.

Feature Summary

• Integrates pre-biased resistors to reduce external component count and board space.
• High-speed switching capability suitable for high-frequency applications.
• Compact surface-mount packaging designed for automated assembly.

Applications

• General-purpose switching circuits
• Driver circuits for logic interfaces
• Level shifting between different voltage domains

Procurement Notes

Verify the specific suffix AT146 to confirm tape-and-reel packaging quantity and orientation. Ensure compliance with RoHS directives if required by the target application. Check for moisture sensitivity level requirements during storage and handling. Confirm availability status as standard products may undergo lifecycle changes.

Selection Notes

Select this component when a compact NPN switch with integrated biasing is needed. Compare hFE ranges and resistor values against other DTC series parts if specific gain or input impedance characteristics are critical. Ensure the 50V voltage rating exceeds the maximum circuit operating voltage.

Part Context

This part belongs to ROHM's DTC series of digital transistors, which combine bipolar junction transistors with internal resistors. The SMT3 package is a standard small-outline form factor widely used in consumer electronics and industrial control boards for space-constrained designs.

Replacement Considerations

Direct substitutes within the same family include DTC125TUA and DTC125TKA, provided pinout and electrical ratings match. Verify that any replacement maintains the same polarity (NPN) and package dimensions for mechanical compatibility.