BC640TA

Overview

The BC640TA is a PNP silicon epitaxial planar transistor manufactured by onsemi, housed in a TO-92 plastic package. It is designed for high current applications with a continuous collector current of 500 mA and a collector-emitter voltage rating of 80 V. The device features a transition frequency of 150 MHz and a total power dissipation of 625 mW at 25°C ambient temperature. DC current gain (hFE) is specified as a minimum of 40 at 150 mA and 2 V. The component operates within a junction temperature range of -55°C to 150°C.

Feature Summary

• PNP medium power transistor construction using silicon epitaxial planar technology
• High current capability suitable for switching and amplification tasks
• Lead-free compliant packaging with prefix designation

Applications

• General purpose switching circuits
• Amplifier stages requiring moderate current drive
• Complementary pairs with NPN counterparts like BC635

Procurement Notes

Verify the part number suffix TA indicates lead-free compliance and specific packaging configuration as defined by onsemi. Confirm RoHS status and manufacturing date codes against current datasheets. Ensure the supplier provides original manufacturer documentation to validate authenticity and traceability for quality assurance purposes.

Selection Notes

Select this component when a PNP transistor with 80 V breakdown and 500 mA continuous current is required in a through-hole TO-92 package. Consider the thermal resistance characteristics for heat dissipation requirements. Compare hFE ranges and saturation voltages against circuit design specifications to ensure adequate performance margins for the intended application load.

Part Context

The BC640TA belongs to the BC640 series of PNP transistors, often paired with NPN devices such as the BC635 for complementary push-pull configurations. This family is widely used in audio and general electronic circuits due to its balanced electrical characteristics and standard TO-92 footprint. The TA suffix typically denotes specific environmental compliance or packaging variations within the onsemi product line.

Replacement Considerations

BC640ZL1 is a discontinued equivalent from onsemi. Verify pinout compatibility and electrical parameter overlaps before substitution.