BC639_D75Z

Overview

The BC639_D75Z is an NPN epitaxial silicon transistor manufactured by onsemi, designed for medium power applications. It features a maximum collector current of 1 A and a collector-emitter breakdown voltage of 80 V. The device has a transition frequency of 200 MHz and a maximum power dissipation of 800 mW. It operates within a junction temperature range of -55 °C to 150 °C. The component utilizes a TO-226-3 (TO-92) through-hole package with three pins.

Feature Summary

• High continuous collector current capability up to 1 A
• Low voltage operation with 80 V collector-emitter breakdown
• Suitable for switching and amplifier applications

Applications

• General purpose switching circuits
• Linear amplifier stages
• Complementary pairs with BC640 series

Procurement Notes

Verify the specific manufacturer source, as the BC639 part number is widely produced by multiple vendors including NXP and Fairchild. Confirm that the D75Z suffix corresponds to the intended tape-and-reel or box packaging configuration required for your assembly process. Ensure the datasheet matches the specific electrical characteristics needed for your design constraints.

Selection Notes

Select this component when a robust NPN transistor with 1 A current handling is required in a standard TO-92 package. It serves as a complement to the PNP BC640. Consider thermal management requirements due to the 800 mW power dissipation limit in small signal packages. Verify compatibility with existing circuit designs using the BC636/BC638 family.

Part Context

The BC639 belongs to a long-standing family of NPN medium power transistors originally defined by Philips Semiconductors. It is commonly used in audio and RF applications requiring high current gain. The device is often paired with the BC640 PNP transistor to form complementary push-pull output stages in various electronic equipment.

Replacement Considerations

Direct substitutes include BC639 from NXP, Fairchild, and Zetex. For pin-compatible alternatives, consider BCX70G or BSR43. Verify that replacement parts meet the same 1 A current and 80 V voltage ratings.