2SA1837(PAIO,F,M)

Single Bipolar Transistors Overview

The Toshiba Semiconductor and Storage 2SA1837 is a silicon PNP epitaxial planar transistor designed for power amplifier applications. It features a high transition frequency of 70 MHz typical, making it suitable for driver stage amplification. The device is electrically complementary to the 2SC4793 NPN transistor. Key absolute maximum ratings include a collector-emitter voltage of -230 V, a collector current of -1 A, and a collector power dissipation of 2 W at 25°C ambient temperature, or 20 W at 25°C case temperature. The component utilizes a TO-220NIS (2-10R1A) through-hole package with an isolated flange mount.

Single Bipolar Transistors Feature Summary

• High transition frequency capability for efficient signal amplification
• Designed as a complementary pair to the 2SC4793 NPN transistor
• Capable of handling significant collector power dissipation when mounted on a heatsink

Single Bipolar Transistors Applications

• Power amplifier circuits
• Driver stage amplifiers

Single Bipolar Transistors Procurement Notes

Verify RoHS compliance status carefully, as datasheet documentation indicates non-compliance for certain manufacturing dates while other sources list lead-free variants. Confirm the specific ordering suffix matches the required environmental standards. Check availability as the component may be discontinued or subject to long lead times depending on the supplier. Ensure the package type aligns with the thermal management requirements of the target design.

Single Bipolar Transistors Selection Notes

Select this component for designs requiring a high-voltage PNP transistor with moderate current handling capabilities. The 230 V breakdown voltage supports high-voltage audio or industrial amplifier stages. Consider the thermal resistance characteristics when designing the heat sinking solution, as power dissipation drops significantly from 20 W at the case to 2 W at ambient temperature. Verify that the DC current gain meets the minimum requirements for the intended biasing conditions.

Single Bipolar Transistors Part Context

The 2SA1837 belongs to Toshiba's lineup of bipolar junction transistors intended for general electronics applications. It serves as a replacement for older obsolete components like the BF469 in specific amplifier topologies. The device is manufactured using silicon epitaxial planar technology, which provides robust performance characteristics for linear amplification tasks within standard consumer and industrial equipment.

Single Bipolar Transistors Replacement Considerations

The 2SC4793 is the documented complementary NPN counterpart. No direct single-part replacements are listed in the official documentation; however, designers should consult Toshiba's reliability handbook for derating guidelines when substituting components in existing high-reliability designs.