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

onsemi BDW46G

Name: BDW46G
Brand: onsemi
SKU: BDW46G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BDW46G

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: BDW46G.pdf

Description:: TRANS PNP DARL 80V 15A TO-220

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Product details

Overview

BDW46G from onsemi is a PNP silicon Darlington power transistor in TO-220 package, rated for 80 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 low-speed switching in industrial motor controls, relay drivers, and DC power supply regulators.

For engineers reviewing the BDW46G datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO(sus) = 80 V, I_C = 15 A, built-in base-emitter shunt resistors, thermal resistance R_JC = 1.47 °C/W, and Pb-free RoHS-compliant TO-220 packaging.

Technical Context

The BDW46G implements a monolithic PNP Darlington pair with integrated base-emitter shunt resistors to ensure reliable turn-off and reduce external component count. It operates in active and saturation regions with V_CE(sat) ≤ 2.0 V at I_C = 5.0 A / I_B = 10 mA and supports safe single-pulse operation up to 200°C junction temperature.

Its SOA is limited by second breakdown (I_S/B = 3.0 A at V_CE = 22.5 V) and thermal constraints, with derating starting above 25°C at 0.68 W/°C. Small-signal f_T = 4.0 MHz and C_ob = 300 pF reflect its low-frequency switching optimization.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO(sus)	80 V min - sustains 80 V collector-emitter voltage at I_C = 30 mA with base open, defining maximum blocking capability in switching applications.
I_C (max)	15 A dc - continuous collector current rating, enabling high-current load control without forced cooling under specified thermal conditions.
P_D @ T_C = 25°C	85 W - total device dissipation at case temperature 25°C; requires heatsink design accounting for R_JC = 1.47 °C/W.
h_FE (typ)	2500 @ I_C = 5.0 A - high DC current gain reduces required base drive current, simplifying driver stage design.
V_CE(sat)	2.0 V max @ I_C = 5.0 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 requirement for thermal management.

Pinout & Package

BDW46G uses the standard TO-220 (Case 221A, Style 1) plastic package with three leads: Collector (pin 1), Base (pin 2), Emitter (pin 3). The metal tab is electrically connected to the collector and must be insulated if mounted to a grounded heatsink.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Tab)	Collector	Electrically connected to metal tab; requires electrical isolation when heatsink is grounded or shared with other devices.
Pin 2	Base	Controls transistor conduction; internal shunt resistor ensures reliable turn-off without external pull-down.
Pin 3	Emitter	Common return path for load current; polarity reversed vs. NPN types (e.g., BDW42G), requiring complementary circuit layout.

Key Features

Feature	Design Value
Monolithic Darlington construction	Integrates driver and output transistors on one die, eliminating interconnection parasitics and improving reliability over discrete pairs.
Built-in base-emitter shunt resistors	Ensures guaranteed turn-off without external components, reducing BOM count and PCB space in relay/motor driver circuits.
High V_CEO(sus) = 80 V	Supports 24–48 V industrial bus systems with margin for inductive kickback in solenoid and motor control.
Pb-free and RoHS-compliant	Meets global environmental compliance requirements for industrial and consumer equipment manufacturing.

Applications

Industrial Relay Drivers	DC Power Supply Regulators
Use Scenario: Driving 24 VDC industrial relays with coil currents up to 12 A in PLC output modules. IC Role / Device Role / Timing Role: PNP Darlington switch providing high-current, low-saturation on/off control of relay coils. Use Value: High h_FE = 2500 allows microcontroller GPIO direct drive with minimal base current, reducing external driver complexity.	Use Scenario: Series pass element in linear regulated 12 V/5 A bench power supplies. IC Role / Device Role / Timing Role: Main series-pass transistor dissipating up to 40 W during regulation under worst-case dropout. Use Value: 85 W rating and R_JC = 1.47 °C/W enable stable operation with moderate heatsinking, avoiding thermal shutdown.
Motor Control (Low-Speed)	Heater/Solenoid Actuation
Use Scenario: Bidirectional H-bridge half-bridge leg (with BDW42G) controlling 36 V brushed DC motors in HVAC dampers. IC Role / Device Role / Timing Role: High-side PNP switch enabling simple gate drive topology in low-frequency (<1 kHz) PWM motor control. Use Value: V_CEO(sus) = 80 V provides headroom for back-EMF suppression, while low V_CE(sat) limits power loss during conduction.	Use Scenario: On/off control of 48 V/8 A resistive heating elements in industrial ovens. IC Role / Device Role / Timing Role: High-current switching element interfacing between logic-level controller and high-power load. Use Value: Built-in shunt resistor eliminates need for external pull-down, ensuring fail-safe deactivation during MCU reset or brownout.

Industrial Relay Drivers

DC Power Supply Regulators

Use Scenario: Driving 24 VDC industrial relays with coil currents up to 12 A in PLC output modules.

IC Role / Device Role / Timing Role: PNP Darlington switch providing high-current, low-saturation on/off control of relay coils.

Use Value: High h_FE = 2500 allows microcontroller GPIO direct drive with minimal base current, reducing external driver complexity.

Use Scenario: Series pass element in linear regulated 12 V/5 A bench power supplies.

IC Role / Device Role / Timing Role: Main series-pass transistor dissipating up to 40 W during regulation under worst-case dropout.

Use Value: 85 W rating and R_JC = 1.47 °C/W enable stable operation with moderate heatsinking, avoiding thermal shutdown.

Motor Control (Low-Speed)

Heater/Solenoid Actuation

Use Scenario: Bidirectional H-bridge half-bridge leg (with BDW42G) controlling 36 V brushed DC motors in HVAC dampers.

IC Role / Device Role / Timing Role: High-side PNP switch enabling simple gate drive topology in low-frequency (<1 kHz) PWM motor control.

Use Value: V_CEO(sus) = 80 V provides headroom for back-EMF suppression, while low V_CE(sat) limits power loss during conduction.

Use Scenario: On/off control of 48 V/8 A resistive heating elements in industrial ovens.

IC Role / Device Role / Timing Role: High-current switching element interfacing between logic-level controller and high-power load.

Use Value: Built-in shunt resistor eliminates need for external pull-down, ensuring fail-safe deactivation during MCU reset or brownout.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BDW47G	V_CEO(sus) = 100 V (vs. 80 V), same I_C = 15 A, identical TO-220 package and pinout.	Preferred where higher voltage margin is needed against transients or in 72 V nominal systems.	Select BDW47G when system V_CC exceeds 50 V or inductive energy storage demands >80 V clamping.
MJD47T4G	TO-252 (DPAK) surface-mount package, V_CEO = 100 V, I_C = 10 A, h_FE = 750 (min) - lower gain and power rating.	Suitable for space-constrained PCBs but requires re-layout and thermal redesign due to different footprint and lower dissipation.	Choose MJD47T4G only for new SMT designs prioritizing board area over legacy through-hole compatibility.

Compared with BDW47G, BDW46G offers tighter voltage rating (80 V) with identical thermal and current capability, making it optimal for cost-sensitive 24–48 V systems; versus MJD47T4G, BDW46G delivers higher gain and power in a through-hole package ideal for prototyping and industrial serviceability.

Availability

BDW46G is available at Aetrix Electronics and suitable for industrial relay drivers, DC power supply regulators, and low-speed motor control applications requiring stable component supply across extended production lifecycles.

Supply support for BDW46G 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 power management, analog, sensor, and discrete solutions for automotive, industrial, and cloud power markets.

The BDW46G belongs to onsemi's legacy silicon power transistor family, engineered for robust, low-speed switching in industrial control and power conversion where reliability, thermal stability, and ease of drive are critical.

FAQ

What is the maximum continuous collector current rating for BDW46G?

The BDW46G is rated for 15 A continuous collector current (I_C) at case temperature T_C = 25°C. Derating is required above this temperature at 0.68 W/°C, and actual usable current depends on heatsink performance and ambient conditions. For sustained 15 A operation, thermal design must maintain T_C ≤ 25°C per the datasheet's maximum ratings table.

Does BDW46G have built-in base-emitter resistors?

Yes, BDW46G features monolithic construction with built-in base-emitter shunt resistors. This design ensures reliable turn-off without requiring external pull-down components, simplifying circuit design in relay drivers and other switching applications where guaranteed off-state behavior is essential. The resistor value is not specified separately but is integral to the device's guaranteed V_CE(sat) and h_FE performance.

What is the collector-emitter sustaining voltage (V_CEO(sus)) of BDW46G?

The BDW46G has a minimum collector-emitter sustaining voltage V_CEO(sus) of 80 Vdc at I_C = 30 mAdc with base open. This parameter defines the maximum voltage the device can block in the off state under specified test conditions and is distinct from V_CEO - it reflects ruggedness against transient overvoltage during switching, especially in inductive load applications.

Can BDW46G be used as a direct replacement for BDW47G?

No, BDW46G is not a direct replacement for BDW47G due to differing V_CEO(sus) ratings: BDW46G is rated at 80 V min, while BDW47G is rated at 100 V min. Although both share identical pinout, package, and current rating, substituting BDW46G in a BDW47G-design may compromise voltage margin in systems exposed to >80 V transients. Always verify operating voltage stress margins before interchange.

What is the thermal resistance junction-to-case (R_JC) for BDW46G?

The BDW46G has a thermal resistance junction-to-case (R_JC) of 1.47 °C/W, measured under specified test conditions. This value is critical for heatsink sizing: for example, to maintain T_J ≤ 150°C at 85 W dissipation, the total thermal path (heatsink + interface) must limit temperature rise to ≤ 65°C, requiring careful interface material selection and mechanical mounting pressure.

BDW46G 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):: 80 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

BDW46G FAQ

1.How can I place an order for BDW46G through Aetrix?

Please submit a Request for Quotation (RFQ) for BDW46G 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 BDW46G reliable?

The price and inventory of BDW46G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDW46G is usually 5 days.

3.What payment methods are accepted for BDW46G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDW46G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BDW46G?

BDW46G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BDW46G 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 BDW46G?

For technical support, including BDW46G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDW46G requirements.

6.How does Aetrix verify that BDW46G is sourced from the original manufacturer or authorized distributors?

All BDW46G 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 BDW46G meets industry standards.

7.What is the process for return or replacement of BDW46G?

All BDW46G units undergo pre-shipment inspection (PSI). If there is an issue with BDW46G, 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 BDW46G part is unused and in its original packaging.

Return procedure for BDW46G:

1.Submit a request within 90 days.

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

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