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

STMicroelectronics BDW94C

Name: BDW94C
Brand: STMicroelectronics
SKU: BDW94C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BDW94C

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: BDW94C.pdf

Description:: TRANS PNP DARL 100V 12A TO-220

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BDW94C from STMicroelectronics is a complementary PNP silicon power Darlington transistor in TO-220 package, featuring integrated antiparallel collector-emitter diode, 100 V V_CEO, 12 A I_C, and 80 W P_tot at T_c ≤ 25 °C. It operates as a high-current switching or linear amplification device in industrial motor drives and power supplies.

For engineers reviewing the BDW94C datasheet, BDW94C pinout, BDW94C application, or BDW94C equivalent, key selection criteria include V_CEO(sus) = 100 V, h_FE ≥ 100 at I_C = 10 A, integrated antiparallel diode, thermal resistance R_thj-case = 1.56 °C/W, and safe operating area compliance for repetitive switching.

Technical Context

The BDW94C implements a monolithic Darlington configuration with built-in base-emitter resistors (R1 ≈ 10 kΩ, R2 ≈ 150 Ω) and an integrated antiparallel diode across collector-emitter terminals. Its PNP polarity and negative voltage/current ratings enable complementary operation with BDW93C in push-pull or H-bridge topologies.

Designed for rugged industrial use, it supports DC and pulsed operation up to 150 °C junction temperature, with guaranteed V_CEO(sus) = 100 V at I_C = 100 mA and V_CE(sat) = 3 V at I_C = 10 A / I_B = 100 mA - critical for low-loss switching in linear regulators and motor control stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	100 V - maximum sustainable collector-emitter voltage with base open, defining safe blocking capability in switching applications
I_C	12 A - continuous DC collector current rating, determining maximum load-handling capacity in power stages
P_tot	80 W at T_c ≤ 25 °C - total power dissipation limit, dictating heatsink sizing and thermal derating requirements
R_thj-case	1.56 °C/W - junction-to-case thermal resistance, enabling precise junction temperature calculation under known case temperature
h_FE	100 min at I_C = 10 A - minimum DC current gain, ensuring reliable base drive margin for high-current saturation
V_F	1.3–2 V at I_F = 5–10 A - forward voltage of integrated antiparallel diode, reducing need for external flyback diodes in inductive loads
V_CE(sat)	3 V at I_C = 10 A / I_B = 100 mA - collector-emitter saturation voltage, directly impacting conduction loss and thermal design

Pinout & Package

BDW94C is housed in a JEDEC TO-220 plastic package with standard three-terminal configuration: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. The metal tab is electrically connected to the collector and serves as primary heat transfer path.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Emitter)	Main emitter terminal	Current return path; internally tied to emitter of Darlington pair; requires low-impedance connection to ground or low-side rail
Pin 2 (Base)	Control input	Drives internal Darlington pair via integrated R1/R2 bias network; enables simplified gate drive without external resistors
Pin 3 (Collector)	High-side output node	Primary power output; electrically connected to metal tab; must be isolated from heatsink unless using insulating washer

Key Features

Feature	Design Value
Integrated antiparallel diode	Eliminates need for external flyback diode in relay/motor driver circuits, reducing BOM count and PCB footprint
Monolithic Darlington structure	Delivers h_FE ≥ 100 at 10 A, enabling direct microcontroller GPIO drive with minimal base current (≤100 mA)
Internal base-emitter resistors	R1 ≈ 10 kΩ and R2 ≈ 150 Ω provide self-biasing and turn-off assurance, improving reliability in noisy industrial environments
TO-220 package with collector-tab isolation	Enables direct mounting to heatsink while maintaining electrical isolation unless tab is intentionally bonded to circuit ground

Applications

Industrial Motor Control

DC Power Supply Regulator

Use Scenario: Driving 24–48 V DC brushed motors in conveyor systems with PWM switching at ≤20 kHz.

IC Role / Device Role / Timing Role: High-side PNP switch in half-bridge configuration, handling bidirectional current with integrated diode freewheeling.

Use Value: V_CEO(sus) = 100 V ensures margin against inductive kickback; V_F ≤ 2 V reduces energy loss during flyback phase.

Use Scenario: Series pass element in adjustable linear power supply delivering up to 10 A at 30 V output.

IC Role / Device Role / Timing Role: Linear regulator pass transistor operating in active region, dissipating up to 80 W with forced-air cooling.

Use Value: R_thj-case = 1.56 °C/W allows accurate thermal modeling; h_FE ≥ 100 ensures stable current gain across load range.

AC/DC SMPS Output Stage

Industrial Relay Driver

Use Scenario: Synchronous rectifier or output switch in offline flyback or forward converter with 100 V clamp.

IC Role / Device Role / Timing Role: Complementary PNP switch paired with BDW93C in active-clamp topology, managing reverse recovery and voltage clamping.

Use Value: Integrated diode provides controlled reverse conduction; V_CE(sat) = 3 V minimizes conduction loss at full load.

Use Scenario: Direct-driving 12–24 V industrial relays with coil inductance >100 mH and contact current >5 A.

IC Role / Device Role / Timing Role: High-current interface between logic-level controller and inductive load, providing fast turn-on/turn-off with built-in snubbing.

Use Value: Internal R1/R2 resistors ensure clean turn-off; V_CEO(sus) = 100 V withstands relay coil flyback spikes without external suppression.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BDW94B	V_CEO = 80 V (vs. 100 V), same package and pinout	Limited to lower-voltage systems (≤60 V bus); reduced safe operating area above 60 V	Select when system max V_CE < 70 V and cost sensitivity outweighs voltage margin
MJD47	TO-252 (DPAK) package, no integrated diode, V_CEO = 100 V, h_FE = 500 min	Requires external flyback diode; unsuitable for space-constrained designs needing integrated protection	Choose for surface-mount assembly where thermal performance permits lower P_tot (65 W)

Compared with BDW94B and MJD47, BDW94C uniquely combines 100 V blocking, integrated diode, TO-220 mechanical robustness, and Darlington gain - making it optimal for through-hole industrial switching where reliability and layout simplicity are prioritized over footprint size.

Availability

BDW94C is available at Aetrix Electronics and suitable for industrial motor control, linear power regulation, AC/DC SMPS output stages, and relay driving requiring stable component supply across multi-year production cycles.

Supply support for BDW94C 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The BDW94C belongs to ST's legacy power bipolar transistor family, engineered specifically for rugged industrial switching and linear power applications demanding high current, integrated protection, and proven thermal reliability.

FAQ

Is BDW94C pin-compatible with BDW94B?

Yes, BDW94C and BDW94B share identical TO-220 package dimensions, pinout (Emitter-Base-Collector), and mechanical mounting. However, BDW94C offers higher V_CEO (100 V vs. 80 V) and improved safe operating area, making it a direct upgrade where voltage margin is critical.

Does BDW94C require external base resistors?

No. BDW94C integrates internal base-emitter resistors (R1 ≈ 10 kΩ, R2 ≈ 150 Ω), enabling direct drive from microcontroller GPIO or logic-level signals without external bias components - simplifying design and improving turn-off reliability.

What is the role of the integrated antiparallel diode?

The integrated collector-emitter diode provides intrinsic freewheeling path for inductive loads, eliminating discrete flyback diodes in motor drivers and relay interfaces. It conducts during turn-off transients, limiting voltage overshoot to ~2 V and reducing EMI generation.

Can BDW94C be used in parallel configurations?

Yes, but only with careful thermal and current balancing. Due to positive temperature coefficient of V_CE(sat), paralleling requires matched devices, shared heatsinking, and individual emitter resistors (≥0.1 Ω) to ensure current sharing - ST does not guarantee inherent current sharing without these measures.

BDW94C Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Active

Transistor Type:: PNP - Darlington

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

Voltage - Collector Emitter Breakdown (Max):: 100 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

BDW94C FAQ

1.How can I place an order for BDW94C through Aetrix?

Please submit a Request for Quotation (RFQ) for BDW94C 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 BDW94C reliable?

The price and inventory of BDW94C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDW94C is usually 5 days.

3.What payment methods are accepted for BDW94C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDW94C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BDW94C?

BDW94C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BDW94C 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 BDW94C?

For technical support, including BDW94C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDW94C requirements.

6.How does Aetrix verify that BDW94C is sourced from the original manufacturer or authorized distributors?

All BDW94C 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 BDW94C meets industry standards.

7.What is the process for return or replacement of BDW94C?

All BDW94C units undergo pre-shipment inspection (PSI). If there is an issue with BDW94C, 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 BDW94C part is unused and in its original packaging.

Return procedure for BDW94C:

1.Submit a request within 90 days.

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

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