2SD2641

Overview

The Sanken 2SD2641 is a silicon NPN triple diffused planar transistor designed for audio, series regulator, and general-purpose applications. It features an absolute maximum collector-emitter voltage of 110 V and a continuous collector current rating of 6 A at 25°C case temperature. The device offers a minimum DC current gain (hFE) of 5000 under standard test conditions. Maximum power dissipation reaches 60 W with an infinite heatsink. The component operates within a junction temperature range of -55 to +150 °C and utilizes the MT-100 (TO3P) package.

Feature Summary

• High DC current gain suitable for low-drive applications
• Triple diffused planar construction for reliability
• Complementary pairing available with type 2SB1685

Applications

• Audio amplification circuits
• Series voltage regulators
• General purpose switching applications

Procurement Notes

Verify that the specific order includes the correct hFE rank suffix (O, P, or Y), as these denote distinct gain ranges. Confirm compliance with RoHS standards if required by the end application. Note that this component is marked as not recommended for new designs; ensure existing inventory usage aligns with long-term supply requirements.

Selection Notes

Select based on required hFE rank: Rank O covers 5000 to 12000, Rank P covers 6500 to 20000, and Rank Y covers 15000 to 30000. Ensure thermal management supports the 60 W dissipation limit at 25°C case temperature. Verify compatibility with the complementary 2SB1685 PNP transistor for push-pull configurations.

Part Context

This component belongs to Sanken's discrete transistor portfolio, specifically engineered for high-gain linear and switching roles. It serves as the NPN complement to the 2SB1685 PNP transistor, facilitating matched pairs in amplifier stages. The MT-100 package provides robust mechanical mounting for industrial and consumer electronics.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the official documentation.