BCP51,115

Overview

The BCP51,115 is a PNP medium power bipolar junction transistor manufactured by Nexperia. It is housed in the SOT223 (SC-73) surface-mounted plastic package with four leads. The device supports a maximum collector current of -1 A and a peak collector current of -2 A for single pulses up to 1 ms. It features a collector-emitter voltage rating of -45 V and a collector-base voltage of -45 V. The total power dissipation reaches up to 1.35 W depending on mounting conditions. The component operates within an ambient temperature range of -55 °C to +150 °C and a junction temperature up to 150 °C.

Feature Summary

• High current capability with continuous collector current up to 1 A
• Three distinct DC current gain selection groups available
• AEC-Q101 qualified for automotive applications
• Exposed heatsink in the SOT223 package for improved thermal conductivity

Applications

• Linear voltage regulators
• High-side switches
• Battery-driven devices
• Power management circuits
• MOSFET drivers
• Amplifiers

Procurement Notes

Verify the specific hFE selection group required for the design, as the standard BCP51 part number does not specify the gain bin without a suffix. Confirm the SOT223 package orientation matches the PCB footprint, noting that pin 4 serves as an additional collector connection for thermal purposes. Ensure the application circuit accounts for the negative polarity inherent to PNP transistors.

Selection Notes

Select this component when a PNP transistor with 1 A continuous current handling is needed in a compact SMD form factor. The exposed pad design makes it suitable for applications requiring efficient heat dissipation from the collector. Compare against the NPN complement BCP54 if complementary pairs are required in the same circuit topology.

Part Context

The BCP51 belongs to the Nexperia PNP medium power transistor series, which also includes the BCX51 in the SOT89 package and the BC51PA in the HUSON3 package. These devices share similar electrical characteristics but differ in physical dimensions and thermal performance capabilities based on their respective package types.

Replacement Considerations

BCP54 is the NPN complement within the same family. Other manufacturers produce equivalent PNP transistors in the SOT223 package with comparable 45 V and 1 A ratings, though exact pinout and thermal resistance values must be verified against the original datasheet.

FAQ

What is the function of Pin 4 in the SOT223 package?

Pin 4 is connected internally to the collector. It provides an additional thermal path to the printed-circuit board copper area to enhance heat dissipation.

Does the BCP51 meet automotive standards?

Yes, the BCP51 is qualified in accordance with the AEC-Q101 stress test qualification for discrete semiconductors.

How many current gain selections are available?

There are three current gain selections: standard, -10, and -16, which define different minimum and maximum hFE ranges at specific collector currents.