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

onsemi BDW47

Name: BDW47
Brand: onsemi
SKU: BDW47
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BDW47

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: BDW47.pdf

Description:: TRANS PNP DARL 100V 15A TO-220

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BDW47 from onsemi is a PNP silicon Darlington power transistor in TO-220 package, rated for 100 V_CEO(sus), 15 A_C, and 85 W at T_C = 25°C, with typical h_FE = 2500 at I_C = 5.0 A - designed for medium-power low-speed switching in industrial motor controls and relay drivers.

For engineers reviewing the BDW47 datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO(sus) = 100 V, I_C = 15 A, V_CE(sat) ≤ 2.0 V at 5 A, built-in base-emitter shunt resistors, and TO-220 thermal resistance R_JC = 1.47 °C/W.

Technical Context

The BDW47 operates as a monolithic PNP Darlington pair with integrated base-emitter shunt resistors, enabling simplified biasing and improved turn-off behavior. Its safe operating area (SOA) is defined by second breakdown limits up to 1.0 ms pulses and thermal constraints, with peak junction temperature limited to 200°C.

Electrical characteristics are specified at T_C = 25°C, including f_T = 4.0 MHz, C_ob = 300 pF at V_CB = 10 V, and V_BE(on) ≤ 3.0 V at I_C = 10 A - confirming suitability for DC and low-frequency (<100 kHz) switching where gain stability and saturation voltage matter more than RF performance.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO(sus)	100 V min - sustains 100 V collector-emitter voltage at 30 mA leakage, enabling use in 80–100 V DC bus applications.
I_C	15 A max - continuous collector current rating defines maximum load-handling capability in relay/motor driver stages.
P_D	85 W at T_C = 25°C - total device dissipation sets heatsink sizing baseline; derates 0.68 W/°C above 25°C.
h_FE	1000 min @ 5 A - high DC current gain reduces required base drive current, easing microcontroller interface design.
V_CE(sat)	2.0 V max @ I_C = 5 A, I_B = 10 mA - low saturation voltage minimizes conduction loss and heat generation in on-state operation.
R_JC	1.47 °C/W - junction-to-case thermal resistance determines minimum heatsink thermal impedance needed to maintain T_J ≤ 150°C.

Pinout & Package

BDW47 uses the standard TO-220 (Case 221A, Style 1) plastic package with vertical mounting orientation, metal tab electrically connected to collector, and 3-pin configuration optimized for medium-power discrete mounting and heatsinking.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal of PNP Darlington pair	Connected to positive rail in high-side switch configurations; carries full load current with minimal voltage drop.
2 (Base)	Control input for Darlington pair	Accepts low-current logic-level or resistor-limited drive; internal shunt resistor aids turn-off.
3 (Collector)	Collector terminal (tab-connected)	Electrically tied to metal tab; must be isolated from heatsink unless circuit ground reference permits direct mounting.

Key Features

Feature	Design Value
Monolithic Darlington construction	Integrates driver and output transistors on one die, eliminating external wiring and matching issues while improving gain consistency.
Built-in base-emitter shunt resistors	Ensures reliable turn-off without external pull-down, reducing component count and PCB space in discrete switch designs.
100 V_CEO(sus) rating	Supports operation across 80–100 V industrial DC systems (e.g., PLC outputs, solenoid drivers) without derating or snubbers.
RoHS-compliant Pb-free package	Meets global environmental compliance requirements for industrial equipment without sacrificing thermal or electrical performance.

Applications

Industrial Relay Drivers	DC Motor Control Stages
Use Scenario: Driving 24–48 V DC electromagnetic relays in programmable logic controllers and industrial I/O modules. IC Role / Device Role / Timing Role: High-current PNP switch providing galvanically isolated load control via microcontroller GPIO or optocoupler output. Use Value: 100 V_CEO(sus) withstands relay coil flyback spikes; 15 A rating supports multi-pole or high-coil-resistance relays without parallel devices.	Use Scenario: Low-frequency H-bridge half-bridge or single-ended drive for brushed DC motors in factory automation actuators. IC Role / Device Role / Timing Role: PNP high-side switch enabling bidirectional control when paired with NPN complement (e.g., BDW42). Use Value: High h_FE = 2500 (typ) reduces base drive burden; V_CE(sat) ≤ 2.0 V at 5 A limits conduction loss to <10 W per device at rated current.
Solenoid Actuator Interfaces	Power Supply Foldback Circuits
Use Scenario: Controlling 12–24 V solenoid valves in fluid control systems, HVAC dampers, and pneumatic manifolds. IC Role / Device Role / Timing Role: Medium-power switching element interfacing between low-voltage logic and inductive loads requiring fast turn-on and controlled turn-off. Use Value: Built-in base-emitter shunt resistor ensures clean turn-off despite solenoid back-EMF; TO-220 package allows direct heatsink mounting for sustained duty cycles.	Use Scenario: Current-limiting element in linear or quasi-linear regulated power supplies protecting against short-circuit faults. IC Role / Device Role / Timing Role: Adjustable current-sense pass transistor operating in active region to clamp output current during overload conditions. Use Value: SOA curve validated to 1.0 ms pulses enables brief fault tolerance; 15 A rating supports >10 A foldback thresholds with margin.

Industrial Relay Drivers

DC Motor Control Stages

Use Scenario: Driving 24–48 V DC electromagnetic relays in programmable logic controllers and industrial I/O modules.

IC Role / Device Role / Timing Role: High-current PNP switch providing galvanically isolated load control via microcontroller GPIO or optocoupler output.

Use Value: 100 V_CEO(sus) withstands relay coil flyback spikes; 15 A rating supports multi-pole or high-coil-resistance relays without parallel devices.

Use Scenario: Low-frequency H-bridge half-bridge or single-ended drive for brushed DC motors in factory automation actuators.

IC Role / Device Role / Timing Role: PNP high-side switch enabling bidirectional control when paired with NPN complement (e.g., BDW42).

Use Value: High h_FE = 2500 (typ) reduces base drive burden; V_CE(sat) ≤ 2.0 V at 5 A limits conduction loss to <10 W per device at rated current.

Solenoid Actuator Interfaces

Power Supply Foldback Circuits

Use Scenario: Controlling 12–24 V solenoid valves in fluid control systems, HVAC dampers, and pneumatic manifolds.

IC Role / Device Role / Timing Role: Medium-power switching element interfacing between low-voltage logic and inductive loads requiring fast turn-on and controlled turn-off.

Use Value: Built-in base-emitter shunt resistor ensures clean turn-off despite solenoid back-EMF; TO-220 package allows direct heatsink mounting for sustained duty cycles.

Use Scenario: Current-limiting element in linear or quasi-linear regulated power supplies protecting against short-circuit faults.

IC Role / Device Role / Timing Role: Adjustable current-sense pass transistor operating in active region to clamp output current during overload conditions.

Use Value: SOA curve validated to 1.0 ms pulses enables brief fault tolerance; 15 A rating supports >10 A foldback thresholds with margin.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD47T4G	TO-252 (DPAK) surface-mount package; same V_CEO(sus) = 100 V, I_C = 15 A, but lower P_D = 30 W due to package thermal limits.	Requires PCB layout change; unsuitable for through-hole or high-power heatsink mounting; better for compact, automated assembly.	Select when board space is constrained and power dissipation stays below 30 W; verify thermal pad soldering and airflow.
BDW46G	Same TO-220 package and pinout, but V_CEO(sus) = 80 V (min); otherwise identical h_FE, V_CE(sat), and thermal specs.	Not interchangeable in 100 V systems; acceptable only where bus voltage remains ≤75 V with safety margin.	Use only if system DC bus is confirmed ≤75 V; no PCB changes required, but voltage derating is mandatory.

Compared with BDW47, MJD47T4G trades package form factor and thermal capacity for SMT compatibility, while BDW46G offers identical mechanical fit but reduced voltage headroom - making BDW47 the sole choice for 100 V-rated, through-hole, high-dissipation PNP Darlington switching.

Availability

BDW47 is available at Aetrix Electronics and suitable for industrial relay drivers, DC motor control stages, and solenoid actuator interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for BDW47 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

onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The BDW47 belongs to onsemi's legacy silicon power transistor product line, engineered for robust, cost-effective medium-power switching in industrial control hardware where reliability under sustained thermal stress is critical.

FAQ

What is the maximum collector-emitter sustaining voltage for BDW47?

The BDW47 has a minimum collector-emitter sustaining voltage V_CEO(sus) of 100 Vdc at I_C = 30 mAdc and I_B = 0. This rating is verified per Figure 6 and the Maximum Ratings table in the official BDW42/D datasheet Rev. 17. It reflects the device's ability to block voltage in the off-state without breakdown under specified test conditions, making BDW47 suitable for 80–100 V DC applications.

Is BDW47 pin-compatible with BDW46G?

Yes, BDW47 and BDW46G share identical TO-220 package (Case 221A), pinout (Emitter-Base-Collector), and mechanical footprint. However, BDW47 has V_CEO(sus) = 100 V versus BDW46G's 80 V - so while PCB layout and mounting are identical, BDW47 cannot be substituted for BDW46G without verifying system voltage compliance, and vice versa may risk overvoltage failure in 100 V circuits.

What is the typical DC current gain (h_FE) of BDW47 at 5 A collector current?

The typical DC current gain h_FE of BDW47 is 2500 at I_C = 5.0 Adc and V_CE = 4.0 Vdc, as stated in the Features section and confirmed in the Electrical Characteristics table. The minimum guaranteed h_FE is 1000 under the same conditions. This high gain reduces required base drive current, simplifying interface design with microcontrollers or logic buffers in BDW47-based switching circuits.

Does BDW47 have built-in base-emitter resistors?

Yes, BDW47 features monolithic construction with built-in base-emitter shunt resistors, as explicitly noted in the Features section of the BDW42/D datasheet. These resistors ensure predictable turn-off behavior without requiring external pull-down components, reducing bill-of-materials count and improving reliability in BDW47-based industrial switch designs.

What is the thermal resistance from junction to case (R_JC) for BDW47?

The thermal resistance from junction to case (R_JC) for BDW47 is 1.47 °C/W, as specified in the Thermal Characteristics table. This value applies to the TO-220 package with proper mounting pressure and thermal interface material. It directly determines the minimum heatsink thermal resistance required to maintain junction temperature within the −55°C to +150°C operating range when dissipating power in BDW47 applications.

BDW47 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

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:: 3V @ 50mA, 10A

Current - Collector Cutoff (Max):: 2mA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 1000 @ 5A, 4V

Power - Max:: 85 W

Frequency - Transition:: 4MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

BDW47 FAQ

1.How can I place an order for BDW47 through Aetrix?

Please submit a Request for Quotation (RFQ) for BDW47 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 BDW47 reliable?

The price and inventory of BDW47 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDW47 is usually 5 days.

3.What payment methods are accepted for BDW47?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDW47 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BDW47?

BDW47 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BDW47 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 BDW47?

For technical support, including BDW47 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDW47 requirements.

6.How does Aetrix verify that BDW47 is sourced from the original manufacturer or authorized distributors?

All BDW47 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 BDW47 meets industry standards.

7.What is the process for return or replacement of BDW47?

All BDW47 units undergo pre-shipment inspection (PSI). If there is an issue with BDW47, 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 BDW47 part is unused and in its original packaging.

Return procedure for BDW47:

1.Submit a request within 90 days.

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

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