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

STMicroelectronics BDW84C

Name: BDW84C
Brand: STMicroelectronics
SKU: BDW84C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BDW84C

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-218-3, TO-218AC

Datasheet:: BDW84C.pdf

Description:: TRANS PNP DARL 100V 15A TO-218-3

Quantity:: RFQ Add To RFQ list

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Inventory:5,217

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Product details

Overview

BDW84C from STMicroelectronics is a complementary PNP silicon power Darlington transistor in TO-218 package, rated for 100 V V_CEO, 15 A continuous collector current, and 130 W total dissipation at T_c ≤ 25 °C; used as high-gain output stage in industrial linear regulators and motor drive H-bridge legs.

For engineers reviewing the BDW84C datasheet, BDW84C pinout, BDW84C application, or BDW84C equivalent, key selection criteria include guaranteed h_FE ≥ 750 at I_C = 6 A, V_CE(sat) ≤ 4 V at I_C = 15 A / I_B = 150 mA, and thermal resistance R_thj-case = 0.96 °C/W for heatsink-limited power stage design.

Technical Context

The BDW84C implements a monolithic PNP Darlington structure with integrated emitter-follower driver stage, enabling high DC current gain (h_FE up to 20,000) while maintaining fast switching (t_on = 0.9 µs, t_off = 6 µs under resistive load). Its negative-polarity voltage/current ratings reflect PNP polarity: V_CBO = –100 V, V_CEO = –100 V, I_C = –15 A.

Designed for operation up to T_j = 150 °C, it features low V_BE(on) = –2.5 V at I_C = –6 A and includes built-in protection against secondary breakdown via optimized epitaxial base doping and thermal layout-critical for sustained conduction in industrial motor control.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	–100 V: Maximum reverse-biased collector-emitter voltage before breakdown; defines safe operating area (SOA) limit for inductive load switching.
I_C (cont.)	–15 A: Continuous collector current rating at case temperature ≤25 °C; derates linearly above 25 °C per R_thj-case.
P_tot	130 W: Total power dissipation capability with infinite heatsink at T_c = 25 °C; determines minimum heatsink thermal resistance required.
h_FE	750–20,000: DC current gain range at I_C = –6 A / V_CE = –3 V; enables low-base-drive-current operation in high-power amplifiers.
R_thj-case	0.96 °C/W: Junction-to-case thermal resistance; directly sets temperature rise ΔT_j-c = P_diss × 0.96 for thermal design.
t_off	6 µs: Turn-off time under specified resistive load (V_CC = –30 V, I_C = –10 A); constrains maximum PWM frequency in switching applications.

Pinout & Package

BDW84C is housed in JEDEC TO-218 (SOT-93) plastic package with isolated metal tab (pin 2), standardized for high-power mounting and thermal interface to heatsinks.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	PNP Emitter terminal	Connected to positive rail in high-side switch configuration; carries full load current with minimal voltage drop.
2 (Collector)	PNP Collector terminal	Electrically isolated metal tab; mounted directly to heatsink; must be insulated if heatsink is grounded.
3 (Base)	PNP Base input	High-impedance control node requiring ~150 mA drive for full saturation at 15 A load; sensitive to ESD.

Key Features

Feature	Design Value
Monolithic Darlington architecture	Single-die integration of driver and output transistors eliminates interconnect inductance and mismatch, ensuring consistent gain and switching timing.
Guaranteed h_FE ≥ 750 @ I_C = –6 A	Reduces required base drive current by >10× vs. single bipolar transistor, simplifying gate driver design in high-current stages.
V_CE(sat) ≤ 4 V @ I_C = –15 A	Limits conduction loss to ≤60 W at full load, enabling compact thermal solution in space-constrained industrial enclosures.
TO-218 package with isolated tab	Enables direct mechanical mounting to common heatsink without insulating washers when collector is referenced to system ground.

Applications

Industrial Linear Regulators

H-Bridge Motor Drivers

Use Scenario: High-current series pass element in 0–30 V, 0–10 A programmable bench power supplies.

IC Role / Device Role / Timing Role: PNP Darlington output transistor delivering regulated voltage with low dropout and high ripple rejection.

Use Value: High h_FE minimizes base drive power loss; low V_CE(sat) reduces thermal load on heatsink during constant-current mode.

Use Scenario: Upper-leg switch in 24 V DC brushed motor H-bridge for CNC axis control.

IC Role / Device Role / Timing Role: High-side PNP switch enabling bidirectional current flow with shoot-through prevention via complementary BDW83C pairing.

Use Value: Fast t_off = 6 µs supports 50 kHz PWM without excessive switching loss; SOA rating withstands motor back-EMF transients.

Switch-Mode Power Supply Output Stage

High-Power Audio Amplifier Output

Use Scenario: Primary-side switching transistor in 500 W offline forward converter with active clamp.

IC Role / Device Role / Timing Role: Main switch handling high peak currents (I_CM = –40 A) during transient load steps.

Use Value: Robust secondary breakdown immunity allows reliable operation under short-circuit conditions without external snubbers.

Use Scenario: Complementary output pair in Class AB 100 W audio amplifier for public address systems.

IC Role / Device Role / Timing Role: PNP half of push-pull output stage delivering clean low-distortion current into 4 Ω speaker load.

Use Value: Low V_BE(on) = –2.5 V ensures symmetrical biasing with NPN counterpart; wide SOA prevents thermal runaway at high output power.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD47	TO-252 (DPAK) package; lower P_tot = 30 W; h_FE min = 1000 @ I_C = –3 A	Suitable only for <5 A loads; requires PCB copper pour instead of bolt-on heatsink	Select for surface-mount designs with moderate power and space constraints.
TIP42C	Standard bipolar (not Darlington); V_CEO = –100 V, I_C = –6 A, h_FE = 15–75; no integrated driver stage	Requires higher base drive current; limited to <3 A continuous due to lower SOA	Choose where cost sensitivity outweighs gain and thermal performance requirements.

Compared with MJD47 and TIP42C, BDW84C delivers 2.5× higher continuous current, 7–20× higher DC gain, and superior thermal management via TO-218 package-making it the only option for 10–15 A linear or switching power stages requiring single-device simplicity.

Availability

BDW84C is available at Aetrix Electronics and suitable for industrial motor drives, programmable power supplies, and high-power audio amplifiers requiring stable component supply across multi-year production cycles.

Supply support for BDW84C 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, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

BDW84C belongs to ST's legacy power bipolar transistor family, engineered specifically for robust, high-current linear and switching applications in harsh industrial environments where reliability and SOA integrity are critical.

FAQ

Is BDW84C pin-compatible with BDW83C?

No-BDW84C (PNP) and BDW83C (NPN) are complementary devices with identical TO-218 pinout (Emitter-Collector-Base), but opposite polarity. Their terminals serve mirrored roles: BDW84C pin 1 is emitter (positive rail), while BDW83C pin 1 is collector (ground-referenced). Direct substitution without circuit reconfiguration will cause functional failure.

What is the maximum safe operating frequency for BDW84C in switching mode?

BDW84C is rated for t_off = 6 µs under resistive load conditions. For reliable operation, maximum practical PWM frequency is ≤100 kHz-assuming 20% duty cycle and sufficient dead time to prevent shoot-through. At higher frequencies, switching losses increase significantly due to stored charge and minority carrier lifetime limitations inherent to Darlington structures.

Does BDW84C require a base resistor when driven by a microcontroller GPIO?

Yes-driving BDW84C directly from a 3.3 V or 5 V GPIO requires a series base resistor to limit I_B to ≤0.5 A (absolute max) and ensure proper saturation. For 15 A load, typical I_B = 150 mA demands ~22 Ω (5 V) or ~15 Ω (3.3 V) resistor; use logic-level MOSFET driver ICs for robust, temperature-stable base control.

Can BDW84C be used without a heatsink?

No-BDW84C dissipates up to 130 W at T_c = 25 °C. Even at 1 W dissipation, junction temperature rises 0.96 °C above case temperature. Without a heatsink, case temperature rapidly exceeds 150 °C, triggering thermal shutdown or permanent damage. Minimum heatsink requirement is R_th ≤ 1.5 °C/W for 50 W operation at ambient 50 °C.

BDW84C Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-218-3, TO-218AC

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: PNP - Darlington

Current - Collector (Ic) (Max):: 15 A

Voltage - Collector Emitter Breakdown (Max):: 100 V

Vce Saturation (Max) @ Ib, Ic:: 4V @ 150mA, 15A

Current - Collector Cutoff (Max):: 1mA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 750 @ 6A, 3V

Power - Max:: 130 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-218-3

BDW84C FAQ

1.How can I place an order for BDW84C through Aetrix?

Please submit a Request for Quotation (RFQ) for BDW84C 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 BDW84C reliable?

The price and inventory of BDW84C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDW84C is usually 5 days.

3.What payment methods are accepted for BDW84C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDW84C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BDW84C?

BDW84C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BDW84C 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 BDW84C?

For technical support, including BDW84C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDW84C requirements.

6.How does Aetrix verify that BDW84C is sourced from the original manufacturer or authorized distributors?

All BDW84C 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 BDW84C meets industry standards.

7.What is the process for return or replacement of BDW84C?

All BDW84C units undergo pre-shipment inspection (PSI). If there is an issue with BDW84C, 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 BDW84C part is unused and in its original packaging.

Return procedure for BDW84C:

1.Submit a request within 90 days.

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

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