2SD1781KFRAT146R

Single Bipolar Transistors Overview

The 2SD1781KFRAT146R is an NPN bipolar junction transistor manufactured by Rohm Semiconductor. It features a collector-emitter breakdown voltage of 32V and a maximum continuous collector current of 800mA. The device operates with a transition frequency of 150MHz and has a maximum power dissipation of 200mW. DC current gain (hFE) is specified at a minimum of 180 when tested at 100mA and 3V. The saturation voltage is rated at a maximum of 400mV under conditions of 50mA base current and 500mA collector current. The component utilizes the SMT3 surface-mount package, equivalent to TO-236-3 or SC-59.

Single Bipolar Transistors Feature Summary

• NPN polarity configuration for general-purpose amplification
• Integrated bias resistor structure for simplified digital circuit interfacing
• Surface-mount packaging optimized for automated assembly processes

Single Bipolar Transistors Applications

• Digital switching circuits requiring built-in biasing
• General-purpose amplification in low-power applications
• Automotive electronic systems compliant with AEC-Q101 standards

Single Bipolar Transistors Procurement Notes

Verify the specific suffix KFRAT146R against official Rohm documentation to confirm pinout and electrical tolerances. Ensure compatibility with existing PCB footprints designated for SMT3 packages. Confirm RoHS compliance status for the specific manufacturing batch prior to integration into final assemblies.

Single Bipolar Transistors Selection Notes

Select this component when a compact NPN transistor with integrated bias resistors is required for space-constrained designs. The 32V rating suits low-voltage logic interfaces. Verify that the 200mW power dissipation limit aligns with the thermal management capabilities of the target application environment.

Single Bipolar Transistors Part Context

This part belongs to the Rohm 2SD1781 series of digital transistors. These devices integrate a single NPN transistor with internal bias resistors to reduce external component count. The series is designed for high-reliability applications, including automotive electronics, where consistent performance across temperature variations is critical.

Single Bipolar Transistors Replacement Considerations

The BSR14 from onsemi is documented as a substitute with similar specifications.