DTC643TKT146

Overview

The DTC643TKT146 is a single NPN pre-biased digital transistor manufactured by ROHM Semiconductor. It integrates a bias resistor network within an SMT3 (SOT-23) surface-mount package. Key electrical specifications include a collector-emitter breakdown voltage of 20 V and a continuous collector current of 600 mA. The device features a typical base input resistance of 4.7 kOhms, with only R1 included in the internal configuration. DC current gain is specified at a minimum of 820 at 50 mA and 5 V. Power dissipation is rated at 200 mW, with a maximum operating temperature of +150°C and a transition frequency of 150 MHz.

Feature Summary

• Integrates a single bias resistor (R1) to simplify circuit design and reduce component count.
• Provides high DC current gain for efficient switching applications.
• Utilizes a compact SMT3 surface-mount package suitable for space-constrained designs.

Applications

• General-purpose switching circuits
• Driver circuits for low-power loads
• Logic level translation interfaces

Procurement Notes

Verify the specific suffix T146 corresponds to the required tape-and-reel packaging quantity and orientation before ordering. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor datasheets, as environmental declarations may vary by production batch. Ensure the SMT3 package footprint matches the target PCB layout constraints.

Selection Notes

Select this component when a 20 V collector-emitter voltage rating and 600 mA current capacity are sufficient for the application. The integrated 4.7 kOhm base resistor defines the input drive requirements; ensure the driving source can supply adequate current to switch the transistor effectively. Consider the 200 mW power dissipation limit and thermal management needs for the SMT3 package in the final design.

Part Context

This part belongs to the DTC643 series of NPN digital transistors from ROHM Semiconductor. The series offers various configurations with different resistor values and voltage ratings. The DTC643TKT146 specifically denotes the version with a 4.7 kOhm base resistor, packaged in SMT3 with the T146 taping specification.

Replacement Considerations

Direct substitutes must match the NPN polarity, 20 V VCEO, 600 mA Ic, and SMT3 package. Verify that any alternative component has a comparable hFE and includes a similar base resistor value if direct pin-to-pin replacement without circuit modification is required.