onsemi BCP69

Overview

BCP69 from Fairchild Semiconductor is a PNP general-purpose amplifier transistor designed for medium-power switching and linear amplification up to −1.0 A collector current, with −20 V V_CEO, −30 V V_CBO, and 1.0 W power dissipation at T_A = 25°C. It is used in DC-DC converter control stages, relay drivers, and low-frequency audio preamplifiers.

For engineers reviewing the BCP69 datasheet, pinout, applications, or equivalent options, key selection criteria include its SOT-223 package thermal performance (R_θJA = 125°C/W), guaranteed h_FE ≥ 50 at I_C = −5 mA, V_CE = −1.0 V, and −0.5 V V_CE(sat) at I_C = −1.0 A / I_B = −100 mA.

Technical Context

The BCP69 operates as a silicon PNP bipolar junction transistor fabricated in Fairchild's Process 77. Its design targets stable DC gain (h_FE = 50–375) across I_C = −5 mA to −1.0 A and supports pulsed operation with ≤300 µs pulse width and ≤2.0% duty cycle.

Thermal management relies on FR-4 PCB mounting with ≥6 cm² collector pad area to sustain 1.0 W dissipation. Electrical behavior is characterized at T_A = 25°C, with junction temperature limited to 150°C and storage range spanning −55°C to +150°C.

Key Specifications

Pinout & Package

SOT-223 surface-mount package with 4-pin configuration (pin 4 is tab/collector thermal pad); standard leadframe layout enables manual rework and automated assembly on FR-4 PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC807-40 and MJD2955T4G, the BCP69 uniquely balances 1.0 W power handling, −1.0 A current capability, and SOT-223 manufacturability-making it optimal for cost-sensitive, thermally constrained medium-power PNP switching and amplification.

Availability

BCP69 is available at Aetrix Electronics and suitable for DC-DC converter switching stages, electromechanical relay drivers, and low-frequency audio preamplifiers requiring stable component supply and long-term industrial availability.

Supply support for BCP69 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

Fairchild Semiconductor was a U.S.-based designer and manufacturer of analog and discrete semiconductors, acquired by ON Semiconductor in 2016; known for robust process technologies and broad portfolio of power transistors.

The BCP69 belongs to Fairchild's general-purpose bipolar transistor product line, engineered for cost-effective, thermally reliable medium-power amplification and switching in industrial and consumer power electronics.

FAQ

What is the maximum continuous collector current rating for the BCP69?

The BCP69 has an absolute maximum continuous collector current (I_C) rating of −1.5 A, but its recommended operational limit is −1.0 A for general-purpose amplifier and switching applications. This limit ensures stable h_FE, acceptable V_CE(sat), and thermal reliability within the 1.0 W power dissipation envelope when mounted per datasheet layout guidelines. The BCP69 datasheet specifies −1.0 A as the design-relevant current for typical use cases.

Does the BCP69 have a built-in thermal pad, and how should it be connected?

Yes, the BCP69 in SOT-223 package features an exposed metal collector tab (pin 4) that serves as both electrical connection and thermal path. It must be soldered directly to a ≥6 cm² copper pour on the PCB to achieve the rated 1.0 W power dissipation and R_θJA = 125°C/W. Leaving the tab unconnected or using insufficient copper area will cause rapid junction temperature rise and premature failure of the BCP69.

What is the typical DC current gain (h_FE) of the BCP69 at high current levels?

The BCP69 delivers h_FE ≥ 60 at I_C = −1.0 A, V_CE = −1.0 V, and T_A = 25°C. This value is confirmed in the datasheet's Electrical Characteristics table and reflects usable gain under full-load conditions-critical for ensuring sufficient base drive in saturated switching applications. At lighter loads (I_C = −5 mA), h_FE rises to 50–375, but design margins should rely on the −1.0 A minimum.

Can the BCP69 replace a TO-92 transistor like the BC557 in existing designs?

No-the BCP69 uses SOT-223 packaging and is not a drop-in replacement for TO-92 devices such as the BC557. While both are PNP general-purpose transistors, the BCP69 has different pinout (1=Base, 2=Collector, 3=Emitter, 4=Tab), higher power rating (1.0 W vs. 0.5 W), and requires PCB copper area for thermal management. Replacing BC557 with BCP69 demands layout revision, thermal pad routing, and verification of base drive compatibility due to differing h_FE curves.

What is the safe operating voltage range for the BCP69's collector-emitter junction?

The BCP69 is rated for a maximum collector-emitter voltage (V_CEO) of −20 V under open-base conditions at T_A = 25°C. Operation beyond this value risks avalanche breakdown and permanent damage. For reliable long-term use, design margins should limit V_CE to ≤−16 V in circuits with transient spikes, especially in inductive switching applications. The BCP69 datasheet confirms −20 V as the absolute maximum rating, not a recommended operating point.