onsemi BCP52

Overview

BCP52 from ON Semiconductor is a PNP general-purpose amplifier in SOT-223 package, rated for -60 V V_CEO, -1.2 A continuous collector current, and 1.5 W power dissipation at 25°C - designed for medium-power linear amplification and switching circuits up to 1.0 A in industrial control and power management applications.

For engineers reviewing the BCP52 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal behavior, DC current gain (h_FE = 25–250), saturation voltage (V_CE(sat) = -0.5 V @ -500 mA), and junction temperature limits critical for reliable biasing and thermal design in discrete transistor stages.

Technical Context

The BCP52 operates as a silicon PNP bipolar junction transistor with a maximum junction temperature of 150°C and a thermal resistance of 83.3°C/W (Junction-to-Ambient, FR-4 PCB). Its process 78 fabrication ensures stable DC current gain across collector currents from 5 mA to 500 mA.

It supports both linear amplification (with h_FE min. 25 at IC = -5 mA) and switching operation (V_CE(sat) ≤ -0.5 V at β = 10), with breakdown voltages symmetrically rated at -60 V for both V_CBO and V_CEO, enabling robust use in negative-rail configurations.

Key Specifications

Pinout & Package

SOT-223 4-lead plastic surface-mount package with integrated heat sink tab (pin 4); pin 1 = Base, pin 2 = Collector, pin 3 = Emitter, pin 4 = Collector (thermal tab).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP general-purpose amplifier applications.

Compared with BCP53 and MJD2955, the BCP52 uniquely balances -60 V rating, -1.2 A current, and SOT-223 thermal efficiency - making it optimal for compact, medium-power PNP switching and amplification where PCB real estate and thermal performance are constrained.

Availability

BCP52 is available at Aetrix Electronics and suitable for industrial motor control, LED driver modules, linear voltage regulation, and sensor signal conditioning requiring stable component supply and long-term manufacturability.

Supply support for BCP52 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

ON Semiconductor (formerly Fairchild Semiconductor) is a global semiconductor manufacturer specializing in power management, analog, and discrete devices for automotive, industrial, and consumer applications.

The BCP52 belongs to ON Semiconductor's general-purpose bipolar transistor product line, engineered for cost-effective, thermally robust medium-power amplification and switching in non-critical industrial and commercial systems.

FAQ

What is the maximum continuous collector current rating for the BCP52?

The BCP52 has a maximum continuous collector current (I_C) rating of -1.2 A at T_A = 25°C. This rating assumes proper PCB thermal management using the SOT-223 thermal tab (pin 4). Derating applies above 25°C ambient - 12 mW/°C - and actual usable current depends on layout, copper area, and airflow. The BCP52 is specified for collector currents up to 1.0 A in general-purpose amplifier and switching applications per its official description.

Does the BCP52 have a built-in thermal pad, and how should it be connected?

Yes, the BCP52 in SOT-223 package features a thermal pad (pin 4) that is internally connected to the collector. It must be soldered directly to a large PCB copper pour acting as a heatsink to achieve the specified R_θJA of 83.3°C/W. Leaving pin 4 unconnected or floating will severely degrade thermal performance and may cause premature failure under load. The BCP52's thermal design relies on this connection for safe operation at its full 1.5 W power dissipation rating.

What is the typical DC current gain (h_FE) range of the BCP52 across operating conditions?

The BCP52 exhibits a DC current gain (h_FE) ranging from 25 (minimum at I_C = -5 mA) to 250 (maximum at I_C = -150 mA), with a minimum of 25 also specified at I_C = -500 mA. This wide h_FE span reflects process variation and operating point dependency, and must be accounted for in bias network design. The BCP52's h_FE behavior is documented across temperature and current in its official datasheet Rev. 1.1.0, ensuring predictable performance in production designs.

Can the BCP52 be used as a direct replacement for the BCP51 in existing designs?

No - the BCP52 is not a direct replacement for the BCP51. While both are PNP SOT-223 transistors, the BCP51 is rated for -45 V V_CEO and -1.0 A I_C, whereas the BCP52 is rated for -60 V V_CEO and -1.2 A I_C. Substituting BCP52 for BCP51 may improve voltage margin but requires verification of bias network stability due to differing h_FE curves and saturation characteristics. The BCP52's higher ratings do not guarantee drop-in compatibility without circuit validation.

What is the absolute maximum junction temperature for the BCP52, and how does it affect reliability?

The BCP52 has an absolute maximum junction temperature (T_J) of +150°C, with recommended operating range from -55°C to +150°C. Exceeding 150°C risks permanent degradation of the silicon die and bond wires. Reliability decreases exponentially above 125°C junction temperature; therefore, thermal design must ensure T_J remains within limit under worst-case power dissipation. The BCP52's datasheet specifies all absolute maximum ratings based on this 150°C limit, and sustained operation near this threshold requires rigorous thermal modeling and validation.