Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi BDW94

Name: BDW94
Brand: onsemi
SKU: BDW94
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BDW94

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: BDW94.pdf

Description:: TRANS PNP DARL 45V 12A TO-220-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:5,050

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BDW94 from ON Semiconductor is a PNP epitaxial silicon Darlington transistor in TO-220 package, rated for -45 V V_CEO, -12 A continuous collector current, and 80 W power dissipation at T_C = 25°C. It serves as a high-current linear or switching power device in industrial motor drives, relay drivers, and DC power control circuits.

For engineers reviewing the BDW94 datasheet, pinout, applications, or equivalent options, key selection considerations include its PNP Darlington architecture, -45 V/–12 A rating, TO-220 thermal performance, complementary pairing with BDW93, and discontinuation status requiring supply-chain verification.

Technical Context

The BDW94 operates as a monolithic PNP Darlington pair with integrated base-emitter shunt resistor, delivering high DC current gain (h_FE = 1000–20000 at I_C = –3A to –10A) and low saturation voltage (V_CE(sat) = –2 V at I_C = –5A, I_B = –20mA). Its structure supports linear amplification and hard-switching operation under sustained thermal load.

Designed for power linear and switching applications, it features a maximum junction temperature of 150°C, storage range of –65°C to 150°C, and safe operating area (SOA) defined up to 100 µs pulse width. The device includes an internal parallel diode (V_F = –1.3 V at I_F = –5A) for inductive load commutation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	–45 V - Maximum collector-emitter voltage before breakdown in open-base configuration; defines safe DC blocking capability.
I_C (DC)	–12 A - Continuous collector current rating at T_C = 25°C; sets baseline conduction capacity for thermal design.
P_C	80 W - Collector power dissipation limit at case temperature 25°C; determines heatsink sizing requirement.
h_FE	1000–20000 - DC current gain range across I_C = –3A to –10A; enables low-base-drive switching and stable biasing.
V_CE(sat)	–2 V (I_C = –5A, I_B = –20mA) - Low saturation voltage minimizes conduction loss in switching mode.
T_J	150°C - Maximum allowable junction temperature; constrains thermal design margin under full load.

Pinout & Package

BDW94 is housed in a standard TO-220 package with isolated tab (collector-connected), featuring three leads: Base (pin 1), Collector (pin 2), Emitter (pin 3). The metal tab is electrically connected to the collector and must be insulated from chassis unless intentional common-collector configuration is used.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input terminal	Receives base current to enable Darlington conduction; requires external current-limiting resistor in most driver circuits.
2 (Collector)	Main power output terminal	Connected to metal tab; carries full load current and dissipates majority of heat; requires thermal interface to heatsink.
3 (Emitter)	Power return terminal	Serves as common emitter node; connects to system ground or negative rail in PNP high-side switch configurations.

Key Features

Feature	Design Value
PNP Darlington architecture	Enables high current gain with single-package integration, reducing external component count in high-side switch designs.
TO-220 mechanical outline	Standardized footprint compatible with widely available heatsinks and mounting hardware; tab-isolated variant simplifies insulation requirements.
Integrated parallel diode	Provides built-in freewheeling path for inductive loads (e.g., solenoids, relays), eliminating need for external flyback diode in many applications.
Complementary pairing	Explicitly designed as PNP counterpart to NPN BDW93 series, enabling matched push-pull or H-bridge output stages.

Applications

Industrial Motor Control	DC Power Switching
Use Scenario: Driving brushed DC motors in conveyor systems and automated machinery where bidirectional control is not required. IC Role / Device Role / Timing Role: High-side PNP Darlington switch controlling motor current flow from positive rail to load. Use Value: Delivers –12 A continuous current with low V_CE(sat), minimizing I²R losses and enabling compact thermal design in enclosed enclosures.	Use Scenario: Regulating or switching 24–48 V DC power rails in programmable logic controllers and industrial I/O modules. IC Role / Device Role / Timing Role: Linear pass element or hard-switched power stage in adjustable voltage/current supplies. Use Value: Stable h_FE over wide I_C range ensures predictable base drive requirements across load conditions.
Relay & Solenoid Drivers	Linear Amplifier Stages
Use Scenario: Replacing mechanical relays in HVAC actuators and fluid control valves using solid-state switching. IC Role / Device Role / Timing Role: High-current PNP switch driving coil loads with integrated freewheeling diode functionality. Use Value: Built-in parallel diode (V_F = –1.3 V) suppresses inductive kickback without discrete components, improving board-level reliability.	Use Scenario: Output stage in analog audio or precision DC amplifiers requiring high current delivery into low-impedance loads. IC Role / Device Role / Timing Role: Class-AB or class-A output transistor delivering linear current amplification with minimal crossover distortion. Use Value: High h_FE (>1000) at moderate currents enables stable bias networks and reduces sensitivity to transistor parameter spread.

Industrial Motor Control

DC Power Switching

Use Scenario: Driving brushed DC motors in conveyor systems and automated machinery where bidirectional control is not required.

IC Role / Device Role / Timing Role: High-side PNP Darlington switch controlling motor current flow from positive rail to load.

Use Value: Delivers –12 A continuous current with low V_CE(sat), minimizing I²R losses and enabling compact thermal design in enclosed enclosures.

Use Scenario: Regulating or switching 24–48 V DC power rails in programmable logic controllers and industrial I/O modules.

IC Role / Device Role / Timing Role: Linear pass element or hard-switched power stage in adjustable voltage/current supplies.

Use Value: Stable h_FE over wide I_C range ensures predictable base drive requirements across load conditions.

Relay & Solenoid Drivers

Linear Amplifier Stages

Use Scenario: Replacing mechanical relays in HVAC actuators and fluid control valves using solid-state switching.

IC Role / Device Role / Timing Role: High-current PNP switch driving coil loads with integrated freewheeling diode functionality.

Use Value: Built-in parallel diode (V_F = –1.3 V) suppresses inductive kickback without discrete components, improving board-level reliability.

Use Scenario: Output stage in analog audio or precision DC amplifiers requiring high current delivery into low-impedance loads.

IC Role / Device Role / Timing Role: Class-AB or class-A output transistor delivering linear current amplification with minimal crossover distortion.

Use Value: High h_FE (>1000) at moderate currents enables stable bias networks and reduces sensitivity to transistor parameter spread.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD127G	TO-263 surface-mount package; lower P_C = 35 W; V_CEO = –100 V; h_FE min = 1000 at I_C = –3A	Requires PCB rework for SMT layout; better suited for space-constrained, medium-power designs with higher voltage margin.	Select when board space is limited and thermal management allows lower power dissipation.
BDW94B	Same TO-220 package; V_CEO = –60 V; V_CE(sat) = –2.5 V at I_C = –5A; otherwise identical pinout and gain profile	Higher voltage rating enables use in 48 V nominal systems with transient margin; slightly higher saturation loss.	Choose when system transients exceed –45 V or when legacy BDW94/C stock is unavailable and voltage headroom is critical.

Compared with MJD127G and BDW94B, the BDW94 offers the highest continuous power handling (80 W) in through-hole TO-220 form factor but lacks the voltage margin of BDW94B and the modern packaging of MJD127G-making it optimal for cost-sensitive, thermally robust, legacy-compatible industrial controls.

Availability

BDW94 is available at Aetrix Electronics and suitable for industrial motor control, DC power switching, and relay/solenoid driver applications requiring stable component supply despite its discontinued status.

Supply support for BDW94 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 energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The BDW94 belongs to ON Semiconductor's legacy power bipolar transistor product line, originally developed by Fairchild Semiconductor for high-reliability linear and switching power applications in industrial automation and power conversion.

FAQ

Is BDW94 still in production?

No, BDW94 is officially discontinued per ON Semiconductor documentation. It is no longer manufactured, though limited legacy inventory may be available through authorized distributors and Aetrix Electronics' extended-life component program. Customers should verify current stock and plan for long-term obsolescence mitigation using alternatives like BDW94B or MJD127G.

What is the pin configuration of BDW94?

The BDW94 uses a standard TO-220 pinout: Pin 1 is Base, Pin 2 is Collector (connected to the metal tab), and Pin 3 is Emitter. This configuration is confirmed in the mechanical drawings and absolute maximum ratings table of the BDW94/C Rev. 2 datasheet. Thermal interface design must account for collector-tab connectivity.

Can BDW94 replace BDW93 in a circuit?

No-BDW94 is a PNP Darlington transistor while BDW93 is its NPN complement; they are not interchangeable. Swapping them would invert polarity and likely cause circuit failure. The BDW94 is intended for high-side switching or complementary use alongside BDW93 in push-pull topologies-not as a drop-in replacement.

What is the purpose of the internal parallel diode in BDW94?

The BDW94 integrates a parallel diode between collector and emitter (anode to emitter, cathode to collector), verified by VF measurements of –1.3 V at –5 A. This diode provides intrinsic freewheeling capability for inductive loads, eliminating the need for an external flyback diode in relay, solenoid, or motor-coil drive applications.

Does BDW94 require a heatsink in normal operation?

Yes-BDW94 dissipates up to 80 W at T_C = 25°C, and its R_θJC is approximately 1.56°C/W. Even at moderate currents (e.g., –5 A), junction temperature rise exceeds safe limits without heatsinking. A properly mounted, insulated heatsink is mandatory for continuous operation above ~1 A, per the power derating curve in the datasheet.

BDW94 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: PNP - Darlington

Current - Collector (Ic) (Max):: 12 A

Voltage - Collector Emitter Breakdown (Max):: 45 V

Vce Saturation (Max) @ Ib, Ic:: 3V @ 100mA, 10A

Current - Collector Cutoff (Max):: 1mA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 750 @ 5A, 3V

Power - Max:: 80 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

BDW94 FAQ

1.How can I place an order for BDW94 through Aetrix?

Please submit a Request for Quotation (RFQ) for BDW94 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BDW94 reliable?

The price and inventory of BDW94 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDW94 is usually 5 days.

3.What payment methods are accepted for BDW94?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDW94 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BDW94?

BDW94 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BDW94 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BDW94?

For technical support, including BDW94 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDW94 requirements.

6.How does Aetrix verify that BDW94 is sourced from the original manufacturer or authorized distributors?

All BDW94 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BDW94 meets industry standards.

7.What is the process for return or replacement of BDW94?

All BDW94 units undergo pre-shipment inspection (PSI). If there is an issue with BDW94, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BDW94 part is unused and in its original packaging.

Return procedure for BDW94:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…