DTA123YKAT146

Overview

The DTA123YKAT146 is a single PNP digital transistor manufactured by Rohm Semiconductor, featuring integrated base and emitter-base resistors within an SMT3 (SOT-23) surface-mount package. It supports a maximum collector-emitter voltage of -50 V and a continuous collector current of -100 mA. The device incorporates a 2.2 kΩ base resistor (R1) and a 10 kΩ emitter-base resistor (R2), providing a typical resistance ratio of 4.5. With a power dissipation rating of 150 mW and a transition frequency of 250 MHz, it offers a minimum DC current gain (hFE) of 33 at -10 mA and -5 V. The component operates within a temperature range of -55°C to +150°C.

Feature Summary

• Integrates dual resistors to simplify circuit design and reduce PCB footprint
• Provides high-speed switching capability with a 250 MHz transition frequency
• Ensures stable amplification characteristics through built-in biasing network

Applications

• Digital signal interface and level conversion circuits
• Microcontroller I/O port driving and protection
• Low-power signal amplification and switching control
• Gate drive applications for MOSFETs or relays

Procurement Notes

Verify the specific suffix KAT146 to confirm the tape-and-reel packaging format and quantity. Confirm RoHS compliance status via the official datasheet before integration. Ensure the SMT3 package dimensions align with the target PCB land pattern. Check for any automotive qualification requirements if the application demands AEC-Q101 certification, as standard versions may not include this rating.

Selection Notes

Select this component when a compact PNP solution with fixed biasing is required for low-current switching tasks. Compare the 2.2 kΩ input resistance against other variants like DTA123JKAT146 if different drive currents are needed. Consider the 150 mW power dissipation limit for thermal management in dense layouts. Verify that the -50 V voltage rating meets the system's maximum operating conditions.

Part Context

This part belongs to the DTA123 series of digital transistors from Rohm Semiconductor. The series is designed to replace discrete resistor-transistor combinations, offering space savings and improved consistency. The DTA123YK variant specifically denotes the PNP polarity with defined internal resistance values, distinguishing it from NPN counterparts or other resistance ratios within the same family.

Replacement Considerations

DTA123JKAT146: Offers similar functionality but with a different resistance ratio (21) and higher hFE (80). DTA123TCAT116: Provides higher power dissipation (350 mW) and higher hFE (100) in the same package. Verify pinout compatibility and electrical parameter margins before substitution.