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

STMicroelectronics BDW93C

Name: BDW93C
Brand: STMicroelectronics
SKU: BDW93C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BDW93C

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: BDW93C.pdf

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

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Product details

Overview

BDW93C from STMicroelectronics is an NPN silicon epitaxial-base power Darlington transistor in TO-220 package, designed for high-current linear and switching applications. It features 80 V V_CEO, 12 A continuous collector current, integrated antiparallel collector-emitter diode, 1.56 °C/W junction-to-case thermal resistance, and DC current gain (h_FE) ≥1000 at 3 A / 3 V. It is used in industrial motor control and DC power switching circuits.

For engineers reviewing the BDW93C datasheet, BDW93C pinout, BDW93C application, or BDW93C equivalent, key selection criteria include saturation voltage at 10 A, safe operating area boundaries, built-in diode forward voltage, thermal derating above 25 °C, and complementary pairing with BDW94C for H-bridge designs.

Technical Context

The BDW93C implements a monolithic Darlington configuration with integrated base resistors (R1 = 10 kΩ, R2 = 150 Ω) and an antiparallel collector-emitter diode-enabling bidirectional current handling without external flyback components. Its structure supports both linear amplification (e.g., analog power regulation) and hard-switching operation (e.g., relay drivers).

It operates up to 150 °C junction temperature with 80 W total dissipation at T_c ≤ 25 °C, and exhibits V_CE(sat) = 2 V at I_C = 5 A / I_B = 20 mA and 3 V at I_C = 10 A / I_B = 100 mA-critical for low-loss switching efficiency in industrial power stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - Maximum sustainable collector-emitter voltage with base open; defines upper limit for DC bus voltage in switching applications.
I_C (continuous)	12 A - Continuous collector current rating at T_c = 25 °C; determines minimum heatsink sizing for sustained load conditions.
V_CE(sat)	2 V @ 5 A/20 mA - Low saturation voltage reduces conduction loss and self-heating during on-state operation.
h_FE	≥1000 @ 3 A/3 V - High DC current gain enables direct drive from microcontroller GPIOs or low-power logic outputs.
R_th(j-c)	1.56 °C/W - Junction-to-case thermal resistance; used with heatsink R_th(c-s) to calculate maximum allowable ambient temperature.
V_F (diode)	1.3 V @ 5 A - Forward voltage of integrated antiparallel diode; eliminates need for external freewheeling diode in inductive load switching.
P_tot	80 W @ T_c ≤ 25 °C - Total power dissipation limit; requires active or large passive cooling above case temperature derating threshold.

Pinout & Package

Package: JEDEC TO-220 plastic package with metal tab (pin 2) electrically connected to collector. Mounting hole centered on tab for heatsink attachment.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitting terminal of Darlington pair	Low-impedance output node; connects to load return path or ground in low-side switch configurations.
2 (Collector / Tab)	Main current-carrying terminal and thermal interface	Electrically tied to collector; must be isolated from chassis unless circuit design permits common-collector topology.
3 (Base)	Control input for Darlington pair	Driven by current-limited source; internal R1/R2 network provides bias stability and reduces external component count.

Key Features

Feature	Design Value
Integrated antiparallel diode	Enables single-device inductive load commutation without external flyback diode, reducing BOM count and PCB footprint.
Monolithic Darlington structure	Combines driver and output transistors on one die, delivering >1000 h_FE while maintaining tight parameter matching and thermal coupling.
Internal base bias resistors	R1 = 10 kΩ and R2 = 150 Ω provide stable turn-on/turn-off behavior and reduce gate-drive complexity in digital-control interfaces.
TO-220 mechanical standardization	Supports drop-in replacement across legacy industrial power designs and enables compatibility with widely available heatsinks and mounting hardware.

Applications

DC Motor Control

Industrial Power Supply

Use Scenario: Bidirectional 24–48 V DC motor drive in conveyor systems using H-bridge topology.

IC Role / Device Role / Timing Role: NPN Darlington switch in low-side leg; paired with BDW94C for complementary high-side switching.

Use Value: Integrated diode handles back-EMF during PWM off-time; 12 A rating supports peak stall currents without external snubbers.

Use Scenario: Regulated linear pass element in programmable bench power supplies.

IC Role / Device Role / Timing Role: Series-pass transistor dissipating up to 60 W under load regulation feedback loop.

Use Value: 1.56 °C/W R_th(j-c) allows stable operation at 135 °C junction with standard extruded heatsink, avoiding thermal shutdown.

Relay & Solenoid Driver

Welding Equipment Control

Use Scenario: High-current coil driver for 12 V/24 V industrial relays and hydraulic solenoids.

IC Role / Device Role / Timing Role: Single-stage switch replacing discrete BJT + driver transistor combinations.

Use Value: h_FE ≥1000 enables direct drive from 5 V MCU pins with ≤20 mA base current, eliminating level-shifting circuitry.

Use Scenario: Primary switching element in contactor control modules for arc-welding inverters.

IC Role / Device Role / Timing Role: Hard-switched power stage operating at ≤20 kHz with forced-air cooling.

Use Value: V_CE(sat) = 2 V @ 5 A minimizes conduction loss during extended duty cycles, improving system efficiency and thermal margin.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BDW93B	V_CEO = 60 V (vs. 80 V); same package and pinout	Limited to lower-voltage DC systems (≤48 V bus); reduced SOA at high V_CE	Select when cost sensitivity outweighs voltage headroom requirement and system max V_CE < 60 V.
TIP142	No integrated antiparallel diode; h_FE = 1000 min but no internal base resistors	Requires external flyback diode and base resistor network; higher layout complexity	Choose only if existing design already accommodates discrete diode/resistor implementation and thermal budget permits higher V_F drop.

Compared with BDW93B and TIP142, the BDW93C offers superior voltage margin, simplified layout via integrated diode and bias resistors, and optimized thermal performance for industrial-grade 80 V-class switching-making it the preferred choice where reliability and design consolidation are prioritized.

Availability

BDW93C is available at Aetrix Electronics and suitable for industrial motor control, DC power supply regulation, relay/solenoid driving, and welding equipment requiring stable component supply across multi-year production cycles.

Supply support for BDW93C 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, specializing in automotive, industrial, and power management ICs and discrete devices.

The BDW93C belongs to ST's high-reliability power bipolar transistor family, engineered specifically for ruggedized industrial switching and linear regulation where robustness, thermal stability, and integrated protection features are essential.

FAQ

Is BDW93C pin-compatible with BDW93B and BDW93A?

Yes-BDW93C, BDW93B, and BDW93A share identical TO-220 package outline and pin assignment (E-C-B). However, absolute maximum ratings differ: BDW93C has V_CEO = 80 V, BDW93B = 60 V, and BDW93A = 40 V. Substitution requires verification of voltage stress margins in the target circuit.

Does BDW93C require an external base resistor when driven by a microcontroller?

No-BDW93C integrates R1 = 10 kΩ and R2 = 150 Ω internally, enabling direct connection to 3.3 V or 5 V GPIO outputs. For reliable saturation at full 12 A, ensure base drive delivers ≥100 mA peak current; typical MCU pins may require buffering above 5 A load.

What is the role of the integrated antiparallel diode in BDW93C?

The integrated diode is connected anode-to-collector and cathode-to-emitter, providing a low-inductance path for reverse current during inductive load turn-off. It replaces discrete flyback diodes in relay, solenoid, and motor drive applications-reducing component count, layout area, and parasitic ringing.

Can BDW93C be used in parallel for higher current capability?

Parallel operation is not recommended without individual emitter resistors due to thermal runaway risk. The device lacks intentional emitter ballasting, and parameter spread (especially h_FE and V_BE) between units can cause current imbalance. For >12 A, use a single higher-rated device or consult ST's application note AN271 for proven paralleling techniques.

BDW93C Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Active

Transistor Type:: NPN - 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

BDW93C FAQ

1.How can I place an order for BDW93C through Aetrix?

Please submit a Request for Quotation (RFQ) for BDW93C 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 BDW93C reliable?

The price and inventory of BDW93C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDW93C is usually 5 days.

3.What payment methods are accepted for BDW93C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDW93C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BDW93C?

BDW93C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BDW93C 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 BDW93C?

For technical support, including BDW93C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDW93C requirements.

6.How does Aetrix verify that BDW93C is sourced from the original manufacturer or authorized distributors?

All BDW93C 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 BDW93C meets industry standards.

7.What is the process for return or replacement of BDW93C?

All BDW93C units undergo pre-shipment inspection (PSI). If there is an issue with BDW93C, 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 BDW93C part is unused and in its original packaging.

Return procedure for BDW93C:

1.Submit a request within 90 days.

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

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