2SB1259

Single Bipolar Transistors Overview

The Sanken 2SB1259 is a silicon PNP epitaxial planar transistor designed for general-purpose applications. It features a Darlington configuration with a collector-emitter voltage rating of -120 V and a continuous collector current capacity of -10 A. The device provides a minimum DC current gain (hFE) of 2000 at IC = -10 mA and a typical transition frequency (fT) of 100 MHz. Maximum power dissipation reaches 30 W at a case temperature of 25°C, with an operating junction temperature range spanning from -55°C to +150°C.

Single Bipolar Transistors Feature Summary

• Darlington structure providing high current gain suitable for driver circuits
• Epitaxial planar construction ensuring stable electrical characteristics
• Designed as the complementary counterpart to the 2SD2081 NPN transistor

Single Bipolar Transistors Applications

• Solenoid driver circuits
• Relay driver circuits
• Motor driver circuits

Single Bipolar Transistors Procurement Notes

Verify component authenticity by checking the marking code FM20 on the TO-220F package. Confirm RoHS compliance status through official manufacturer documentation prior to procurement. Ensure storage conditions remain within specified limits to prevent degradation of the semiconductor junction before installation.

Single Bipolar Transistors Selection Notes

Select this component when high current drive capability is required in a compact form factor. The Darlington architecture simplifies base drive requirements compared to single-transistor designs. Verify that the thermal management solution supports the 30 W dissipation rating under expected ambient conditions to maintain safe operating temperatures.

Single Bipolar Transistors Part Context

This device belongs to Sanken's lineup of discrete power transistors intended for industrial and consumer electronics. It serves as a direct complement to the 2SD2081 NPN type, facilitating push-pull or bridge circuit configurations. The TO-220F package allows for efficient heat transfer to external heatsinks in medium-power applications.

Single Bipolar Transistors Replacement Considerations

The datasheet explicitly identifies the 2SD2081 as the complementary NPN type. No other substitute part numbers are documented in the provided source material.