2SB1257

Single Bipolar Transistors Overview

The Sanken 2SB1257 is a silicon PNP epitaxial planar transistor designed as the complement to the 2SD2014 NPN type. It features a TO-220F (FM20) package with an isolated collector. Absolute maximum ratings include a collector-emitter voltage of -60 V, a collector current of -4 A (pulse -6 A), and a power dissipation of 25 W at 25°C case temperature. The device exhibits a minimum DC current gain (hFE) of 2000 and a typical transition frequency (fT) of 150 MHz.

Single Bipolar Transistors Feature Summary

• High DC current gain suitable for driver applications
• Complementary pairing with 2SD2014 NPN transistor
• Isolated collector construction for mounting

Single Bipolar Transistors Applications

• Solenoid drivers
• Relay drivers
• Motor drivers
• General purpose amplification

Single Bipolar Transistors Procurement Notes

Verify the specific manufacturer source when sourcing this component, as the part number has been associated with multiple manufacturers including New Jersey Semiconductor. Confirm that the datasheet specifications match your design requirements, particularly regarding the absolute maximum ratings and thermal characteristics. Ensure the package footprint corresponds to the FM20 (TO-220F) outline provided in the official documentation.

Single Bipolar Transistors Selection Notes

Select this component when a high-gain PNP transistor is required to complement an NPN driver stage, specifically utilizing the 2SD2014 pair. Consider the 25 W power dissipation capability and the need for appropriate heatsinking to maintain operation within the 150°C junction temperature limit. The low saturation voltage and high current gain make it efficient for switching solenoids and motors.

Single Bipolar Transistors Part Context

The 2SB1257 belongs to the family of silicon PNP power transistors manufactured by Sanken Electric. It is engineered for general-purpose high-power amplification and switching tasks. As a complementary device to the 2SD2014, it facilitates the creation of push-pull output stages commonly found in audio amplifiers and motor control circuits.

Single Bipolar Transistors Replacement Considerations

The 2SB1347P is a documented complementary PNP transistor from Panasonic, offering similar flange-mount configurations. Verify pinout compatibility and electrical parameters against the 2SB1257 datasheet before substitution.