BC638TA

Single Bipolar Transistors Overview

The BC638TA is a PNP epitaxial silicon transistor manufactured by onsemi, formerly Fairchild Semiconductor. It features a maximum collector current of -1 A and a collector-emitter voltage of -60 V. The device operates within a temperature range of -55°C to +150°C with a maximum power dissipation of 1 W. Key electrical parameters include a minimum DC current gain (hFE) of 25 and a transition frequency of 50 MHz. It is housed in a TO-92 through-hole package.

Single Bipolar Transistors Feature Summary

• PNP polarity configuration for complementary circuit designs
• Epitaxial silicon construction for reliable switching performance
• Through-hole TO-92 package for standard board mounting

Single Bipolar Transistors Applications

• General-purpose switching applications
• Linear amplifier circuits
• Complementary pairs with NPN transistors

Single Bipolar Transistors Procurement Notes

Verify the manufacturer designation carefully, as onsemi acquired Fairchild Semiconductor's discrete product line. Ensure the part number suffix matches the required packaging format, such as tape and reel or cut tape, as these affect handling but not electrical function. Confirm RoHS compliance status for specific production batches against current environmental regulations.

Single Bipolar Transistors Selection Notes

Select this component when a PNP transistor with 60V breakdown and 1A continuous current capability is required in a compact TO-92 form factor. Consider the thermal resistance and power dissipation limits relative to the expected load current. Verify that the hFE range meets the specific biasing requirements of the target circuit design.

Single Bipolar Transistors Part Context

This component belongs to the BC638 series of medium-power PNP transistors. It serves as the complementary counterpart to the BC641 NPN transistor. The series is widely used in general electronics for signal amplification and low-power switching tasks where moderate voltage and current ratings are sufficient.

Single Bipolar Transistors Replacement Considerations

• BC638TAR
• BC638TA-13

Single Bipolar Transistors FAQ

Is the BC638TA an NPN or PNP transistor?

It is a PNP epitaxial silicon transistor.

What is the maximum collector-emitter voltage rating?

The maximum collector-emitter voltage (VCEO) is -60 V.

Does the TA suffix indicate a different electrical specification than the base model?

No, the suffix typically denotes packaging or lot coding variations; the electrical characteristics remain consistent with the BC638 datasheet.