onsemi BDW94CF

Overview

BDW94CF from ON Semiconductor is a PNP epitaxial silicon Darlington transistor designed for high-current linear and switching applications. It features -100 V collector-emitter sustaining voltage, -12 A DC collector current, 30 W collector dissipation at TC = 25°C, and DC current gain (hFE) of 1000–20000 at IC = -3 A. It is commonly used in motor control circuits and industrial power supplies.

For engineers reviewing the BDW94CF datasheet, pinout, applications, or equivalent options, key selection considerations include its TO-220F insulated package, complementary pairing with BDW93CF, saturation voltage performance under high base drive, and thermal derating behavior above 25°C case temperature.

Technical Context

The BDW94CF implements a monolithic PNP Darlington configuration with integrated parallel emitter-base diode, enabling high current gain and low base drive requirements. Its structure supports both linear amplification and hard-switching operation with specified VCE(sat) down to -2 V at IC = -5 A / IB = -20 mA.

Designed for power-level signal interfacing, it operates with fixed bias or driver-stage coupling, and its insulated TO-220F package allows direct mounting to heatsinks without electrical isolation hardware. Thermal resistance (RθJC) is not explicitly listed but implied by PC = 30 W at TC = 25°C and TJ(max) = 150°C.

Key Specifications

Pinout & Package

BDW94CF is housed in an insulated TO-220F package with metal tab electrically isolated from collector. The package enables direct heatsink mounting without insulating washers while maintaining creepage/clearance compliance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP Darlington transistor applications.

Compared with MJD127G and TIP2955, BDW94CF delivers superior current gain and higher power dissipation in an insulated through-hole package-making it optimal for high-reliability, thermally demanding linear and switching roles where base drive efficiency and heatsink integration matter.

Availability

BDW94CF is available at Aetrix Electronics and suitable for industrial motor control, DC power supply regulation, and relay/solenoid driving applications requiring stable component supply and long-term manufacturability.

Supply support for BDW94CF 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 is a global semiconductor manufacturer specializing in power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud power applications.

The BDW94CF belongs to ON Semiconductor's legacy power bipolar transistor product line, originally developed by Fairchild Semiconductor for robust, high-current linear and switching functions in industrial equipment.

FAQ

What is the maximum continuous collector current rating for BDW94CF?

The BDW94CF has a maximum DC collector current (IC) rating of -12 A at Ta = 25°C. This value assumes adequate heatsinking and derates with increasing case temperature. At TC = 100°C, the usable current drops significantly due to thermal limits-designers must consult the SOA curve and apply appropriate derating per the datasheet's thermal resistance guidance. BDW94CF is intended for applications where sustained current remains within this envelope under real-world thermal conditions.

Does BDW94CF have an integrated diode, and how is it used?

Yes, BDW94CF integrates a monolithic parallel diode between emitter and base terminals. This diode conducts during reverse recovery events-such as when switching inductive loads-and provides a defined freewheeling path without requiring external components. Its forward voltage ranges from -1.3 V to -2 V at IF = -5 A to -10 A. In BDW94CF-based relay drivers or H-bridge stages, this diode reduces voltage spikes and improves switching reliability compared to discrete BJT implementations.

Is BDW94CF pin-compatible with BDW93CF?

No, BDW94CF is not pin-compatible with BDW93CF. While they are complementary PNP/NPN devices intended for matched use in push-pull or bridge topologies, their pinouts differ: BDW94CF uses Base–Collector–Emitter (1–2–3), whereas BDW93CF uses Emitter–Collector–Base (1–2–3). This asymmetry requires careful PCB layout separation. BDW94CF and BDW93CF are functionally complementary but physically distinct in terminal assignment-always verify pin mapping before interchanging in existing designs.

What does the "F" suffix in BDW94CF signify?

The "F" in BDW94CF denotes the TO-220F package variant-specifically, the insulated version of the TO-220 outline where the metal tab (collector) is electrically isolated from the mounting surface. This insulation eliminates the need for thermal washers or insulating pads when attaching to grounded heatsinks. The "F" suffix distinguishes it from non-insulated variants like BDW94C, and is critical for safety and EMC compliance in industrial power systems using BDW94CF.

Can BDW94CF be used in linear amplifier applications?

Yes, BDW94CF is explicitly rated for linear applications per its datasheet title and electrical specifications-including VCE(sat), VBE(sat), and hFE characterization across multiple operating points. Its high hFE and low saturation voltages support Class AB and Class A amplifier output stages, especially where high current and low distortion are required. However, linear use demands strict thermal management: BDW94CF's 30 W dissipation limit applies only at TC = 25°C, so forced-air cooling or large heatsinks are essential for sustained analog operation.