onsemi BCP56

Overview

BCP56 from onsemi is an NPN silicon epitaxial transistor in SOT-223 package, rated for 80 V_CEO, 1.0 A continuous collector current, and 1.5 W power dissipation at T_A = 25°C, designed for medium-power audio amplifier stages in consumer and industrial electronics.

For engineers reviewing the BCP56 datasheet, pinout, applications, or equivalent options, key selection criteria include its 80 V breakdown voltage, 130 MHz f_T, low 0.5 V V_CE(sat) at 500 mA, thermal resistance of 83.3 °C/W, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

The BCP56 operates as a general-purpose medium-power NPN switching and linear amplifier transistor with DC current gain (h_FE) ranging from 25 to 250 depending on bias conditions - 25–100 at I_C = 5 mA, 40–160 at I_C = 150 mA, and 25–250 at I_C = 500 mA. Its SOA supports pulsed operation up to 2 A peak collector current.

Thermal design relies on the SOT-223's exposed collector pad, enabling surface-mount soldering via wave or reflow while absorbing thermal stress. The device meets Pb-free, halogen-free, and RoHS compliance standards with AEC-Q101 qualification for automotive use when ordered with S/NSV prefix variants.

Key Specifications

Pinout & Package

The BCP56 is housed in the SOT-223 (TO-261) surface-mount package with four terminals: pins 1 (Base), 2 and 4 (Collector, internally connected), and 3 (Emitter). The exposed collector tab provides mechanical stability and thermal conduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN medium-power transistor applications.

Compared with BCP56-16T3G, the BCP56 offers wider h_FE variation suitable for cost-optimized designs where base drive裕度 exists; versus BCP53T1G, it serves opposite polarity roles - BCP56 enables low-side switching and NPN amplification where BCP53T1G cannot substitute.

Availability

BCP56 is available at Aetrix Electronics and suitable for audio amplifier stages, automotive body electronics, industrial motor drivers, and DC-DC pre-regulators requiring stable component supply across production lifecycles.

Supply support for BCP56 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

onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The BCP56 belongs to onsemi's general-purpose bipolar transistor product line, engineered for reliable medium-power amplification and switching in cost-sensitive, thermally constrained surface-mount applications.

FAQ

What is the maximum collector-emitter voltage rating for the BCP56?

The BCP56 has a maximum collector-emitter voltage (V_CEO) rating of 80 Vdc at T_C = 25°C. This rating defines the upper limit of voltage the transistor can block in common-emitter configuration before entering avalanche breakdown. Exceeding this value risks permanent damage, especially under sustained or transient overvoltage conditions. The BCP56 datasheet confirms this parameter in the Maximum Ratings table and validates it with V(BR)_CEO test data at I_C = 1.0 mA.

Is the BCP56 suitable for automotive applications?

Yes - the BCP56 is qualified to AEC-Q101 when ordered with S or NSV prefixes (e.g., SBCP56T3G or NSVBCP56−16T3G), making it suitable for automotive body electronics including door lock drivers and lighting controls. The standard BCP56T3G variant is not AEC-Q101 certified; qualification applies only to designated automotive-grade ordering codes. All variants meet RoHS, Pb-free, and halogen-free requirements.

What is the thermal resistance of the BCP56 in typical PCB mounting?

The BCP56 has a junction-to-ambient thermal resistance (R_JA) of 83.3 °C/W when mounted on a standard FR-4 PCB measuring 1.575 in × 1.575 in × 0.0625 in with a 0.93 in² collector pad area. This value assumes surface-mount reflow or wave soldering per the SOT-223 package's thermal design guidelines. Derating begins at 12 mW/°C above 25°C ambient, limiting usable power at elevated temperatures.

Does the BCP56 have a built-in base-emitter resistor?

No - the BCP56 is a discrete NPN bipolar junction transistor with no integrated base-emitter resistors. It requires external base drive circuitry to establish proper bias conditions. Unlike digital transistors (e.g., MMBT2222A with built-in resistors), the BCP56 offers full design flexibility for gain, speed, and saturation control but mandates careful selection of external base resistors or driver stages.

What is the typical current-gain bandwidth product (f_T) of the BCP56?

The BCP56 has a typical current-gain bandwidth product (f_T) of 130 MHz, measured at I_C = 10 mA, V_CE = 5.0 Vdc, and f = 35 MHz. This parameter indicates the frequency at which short-circuit current gain drops to unity and reflects the device's suitability for RF amplification and high-speed switching up to several tens of MHz. The f_T value is confirmed in the Electrical Characteristics table and supported by Figure 2 in the official BCP56T1/D datasheet.