DTC144TKAT146

Overview

The DTC144TKAT146 is an NPN digital transistor manufactured by ROHM Semiconductor, featuring built-in bias resistors within a compact SMT3 (SOT-346) surface-mount package. This single-transistor configuration integrates internal resistance networks to simplify circuit design and reduce component count. The device supports a collector-emitter voltage of 50 V and a continuous collector current of 100 mA, with a power dissipation rating of 200 mW. It includes typical base and emitter resistors of 47 kOhms each, providing a resistor ratio of 1. The unit operates at a maximum junction temperature of +150°C and is designed for high-frequency applications up to 250 MHz.

Feature Summary

• Integrates NPN transistor with dual built-in bias resistors for simplified interface logic
• Compact SMT3 (SOT-346) surface-mount packaging for space-constrained designs
• High-speed operation capability suitable for frequencies up to 250 MHz
• Robust thermal performance with a maximum operating junction temperature of +150°C

Applications

• Logic level shifting between microcontrollers and peripheral devices
• Switching circuits in portable consumer electronics
• Interface drivers for general-purpose digital signal processing

Procurement Notes

Verify the specific suffix 'T146' against official ROHM documentation to confirm tape-and-reel packaging specifications. Ensure compatibility with standard SMT reflow profiles for the SMT3 package. Cross-reference the exact part number with authorized distributors to avoid counterfeit components, as minor suffix variations may indicate different packaging or quality grades.

Selection Notes

Select this component when a pre-biased NPN solution is required to drive loads up to 100 mA from low-current logic outputs. The 47 kOhm input resistance offers a balanced trade-off between drive current requirements and noise immunity. Consider the 200 mW power dissipation limit under actual thermal conditions. Verify that the 50 V breakdown voltage meets the system's supply rail requirements.

Part Context

This part belongs to the DTC144 series of digital transistors from ROHM, which are standardized discrete solutions replacing multiple discrete components. The 'TK' designation typically indicates specific internal resistor values and polarity characteristics within the broader DTC family. These devices are widely used in industrial and consumer electronics where board space and assembly cost are critical factors.

Replacement Considerations

Direct substitutes include other ROHM parts like DTC144EKA or DTC144YKA if resistor ratios differ. External manufacturers such as ON Semiconductor or Diodes Inc. offer equivalent NPN digital transistors in SOT-346 packages, but verify pinout compatibility and hFE gain ranges before substitution.