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

onsemi BDW24ATU

Name: BDW24ATU
Brand: onsemi
SKU: BDW24ATU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BDW24ATU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: BDW24ATU.pdf

Description:: TRANS PNP 60V 6A TO-220-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BDW24ATU from Fairchild Semiconductor is a PNP epitaxial silicon Darlington transistor in TO-220 package, rated for -60 V V_CEO, -6 A continuous collector current, 50 W power dissipation at T_C=25°C, with h_FE ≥750 at I_C = -2 A, and V_CE(sat) ≤ -2 V. It serves as a high-current switching device in audio amplifier output stages and hammer drivers.

For engineers reviewing the BDW24ATU datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed V_CEO = -60 V, DC current gain stability across I_C = -1 A to -6 A, safe operating area (SOA) compliance up to 10 ms pulses, and thermal derating behavior from 50 W at 25°C to zero at 150°C case temperature.

Technical Context

The BDW24ATU implements a monolithic PNP Darlington pair with integrated emitter-base shunt resistor, enabling high DC current gain (h_FE ≥750 at I_C = -2 A) while maintaining low saturation voltage (V_CE(sat) ≤ -2 V). Its structure supports robust secondary breakdown immunity per Figure 4 SOA curves.

It operates as a complementary high-power switch to the NPN BDW23A series, sharing identical TO-220 mechanical footprint and thermal interface geometry. Electrical ratings are specified under pulsed (300 µs, 1.5% duty) and DC conditions, with V_CEO(sus) = -60 V confirmed at I_C = -100 mA, I_B = 0.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-60 V - Maximum allowable collector-emitter voltage before breakdown under DC operation
I_C (DC)	-6 A - Continuous collector current rating defining steady-state power handling capability
P_C @ T_C=25°C	50 W - Maximum dissipated power at case temperature of 25°C, requiring heatsink design
h_FE	750 min @ I_C = -2 A - Minimum DC current gain ensuring reliable base drive sizing
V_CE(sat)	-2 V max @ I_C = -2 A, I_B = -8 mA - Saturation voltage limiting conduction loss in switching applications
T_J max	150°C - Absolute maximum junction temperature determining thermal margin and reliability limits

Pinout & Package

BDW24ATU is housed in a through-hole TO-220 package with metal tab electrically connected to collector, optimized for vertical mounting and heatsink attachment. Pin 1 is Base, Pin 2 is Collector (tab), Pin 3 is Emitter.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input terminal	Receives base current to enable Darlington conduction; requires current-limiting resistor in series
2 (Collector)	Main high-current output node	Connected to metal tab; must be isolated from heatsink unless circuit ground reference permits
3 (Emitter)	Power return path	Serves as common emitter node; carries full load current and defines output polarity (PNP sink)

Key Features

Feature	Design Value
Darlington configuration	Monolithic PNP pair delivering h_FE ≥750 at I_C = -2 A, reducing required base drive current by factor of ~100 vs. single transistor
V_CEO(sus) = -60 V	Guaranteed sustaining voltage under transient overvoltage conditions, supporting robust operation in inductive load switching
TO-220 mechanical standardization	Compatible with industry-standard heatsinks and mounting hardware, enabling drop-in thermal upgrades
Safe Operating Area (SOA)	Defined up to 10 ms pulse width per datasheet Figure 4, allowing reliable short-duration surge current handling

Applications

Audio Power Amplifiers	Electromechanical Hammer Drivers
Use Scenario: Output stage in Class AB audio amplifiers delivering >25 W into 8 Ω loads. IC Role / Device Role / Timing Role: PNP Darlington output switch providing high-current sinking capability during negative half-cycle. Use Value: V_CE(sat) ≤ -2 V minimizes conduction loss and thermal stress at I_C = -4 A peak, improving efficiency and THD performance.	Use Scenario: Driving solenoid-based impact hammers in industrial marking or riveting equipment. IC Role / Device Role / Timing Role: High-current switch controlling 40–60 V, 3–5 A inductive pulses with 10–100 ms duration. Use Value: SOA compliance up to 10 ms ensures reliable turn-on without secondary breakdown during repetitive hammer actuation.
Complementary Power Stage	DC Motor H-Bridge Low-Side
Use Scenario: Upper rail switch in push-pull output stages paired with BDW23A (NPN). IC Role / Device Role / Timing Role: Complementary PNP Darlington matching BDW23A's V_CEO, I_C, and package for symmetrical thermal design. Use Value: Identical TO-220 footprint and thermal resistance enables matched heatsinking and balanced thermal drift in dual-rail amplifiers.	Use Scenario: Low-side switch in 48 V brushed DC motor control for power tools or actuators. IC Role / Device Role / Timing Role: High-current sinking element handling bidirectional stall currents up to -6 A DC. Use Value: -6 A I_C rating and 150°C T_J limit support continuous operation under motor stall conditions without thermal shutdown.

Audio Power Amplifiers

Electromechanical Hammer Drivers

Use Scenario: Output stage in Class AB audio amplifiers delivering >25 W into 8 Ω loads.

IC Role / Device Role / Timing Role: PNP Darlington output switch providing high-current sinking capability during negative half-cycle.

Use Value: V_CE(sat) ≤ -2 V minimizes conduction loss and thermal stress at I_C = -4 A peak, improving efficiency and THD performance.

Use Scenario: Driving solenoid-based impact hammers in industrial marking or riveting equipment.

IC Role / Device Role / Timing Role: High-current switch controlling 40–60 V, 3–5 A inductive pulses with 10–100 ms duration.

Use Value: SOA compliance up to 10 ms ensures reliable turn-on without secondary breakdown during repetitive hammer actuation.

Complementary Power Stage

DC Motor H-Bridge Low-Side

Use Scenario: Upper rail switch in push-pull output stages paired with BDW23A (NPN).

IC Role / Device Role / Timing Role: Complementary PNP Darlington matching BDW23A's V_CEO, I_C, and package for symmetrical thermal design.

Use Value: Identical TO-220 footprint and thermal resistance enables matched heatsinking and balanced thermal drift in dual-rail amplifiers.

Use Scenario: Low-side switch in 48 V brushed DC motor control for power tools or actuators.

IC Role / Device Role / Timing Role: High-current sinking element handling bidirectional stall currents up to -6 A DC.

Use Value: -6 A I_C rating and 150°C T_J limit support continuous operation under motor stall conditions without thermal shutdown.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD2955G	V_CEO = -60 V, I_C = -10 A, h_FE ≥20 at I_C = -4 A - lower gain, higher current rating	Designed for general-purpose power switching rather than audio-grade linearity	Preferred where higher surge current tolerance is needed but gain-critical bias networks are absent
BDW24B	V_CEO = -80 V, otherwise identical pinout, package, and gain profile - higher voltage rating only	Used in systems requiring >60 V rail margin or enhanced transient immunity	Select BDW24B only if system V_CC exceeds 45 V or transient spikes exceed 60 V

Compared with MJD2955G and BDW24B, BDW24ATU offers superior DC current gain (≥750 vs. ≥20) for precise base drive control in linear applications, while maintaining identical TO-220 mechanical fit and thermal interface as BDW24B-making it optimal for legacy audio amplifier replacements where gain and SOA fidelity are critical.

Availability

BDW24ATU is available at Aetrix Electronics and suitable for audio power amplifiers, electromechanical hammer drivers, complementary power stages, and DC motor H-bridge low-side switching requiring stable component supply and long-term obsolescence management.

Supply support for BDW24ATU 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

Fairchild Semiconductor was a U.S.-based semiconductor manufacturer specializing in power discrete devices, analog ICs, and interface solutions before its acquisition by ON Semiconductor in 2016.

The BDW24ATU belongs to Fairchild's legacy high-power Darlington transistor family, designed specifically for linear and switching applications demanding high current gain, rugged SOA, and proven thermal reliability in TO-220 packages.

FAQ

What is the absolute maximum collector-emitter voltage rating for BDW24ATU?

The BDW24ATU has an absolute maximum V_CEO rating of -60 V at T_C = 25°C, verified per datasheet Rev. A. This rating applies to DC operation and is distinct from the sustaining voltage V_CEO(sus) = -60 V measured under I_C = -100 mA, I_B = 0. Exceeding this voltage risks irreversible breakdown. Derating is required above 25°C case temperature per the power derating curve in Figure 5.

Does BDW24ATU have a built-in base-emitter resistor?

No, BDW24ATU does not include an internal base-emitter shunt resistor. It is a standard two-terminal base Darlington transistor requiring external base current limiting. Unlike some modern Darlington variants (e.g., MPSA14), BDW24ATU relies on discrete base resistor networks for bias stability and switching speed control.

What is the typical DC current gain (h_FE) of BDW24ATU at I_C = -6 A?

Per the BDW24ATU datasheet, h_FE is guaranteed ≥100 at V_CE = -3 V and I_C = -6 A. Typical values range between 150–300 under those conditions, as shown in Figure 1. This reduced gain at full-rated current reflects Darlington saturation effects but remains sufficient for most switching and linear amplifier designs using appropriate base drive.

Can BDW24ATU be used as a direct replacement for BDW24 in existing PCB layouts?

Yes, BDW24ATU is a direct mechanical and electrical replacement for BDW24 in TO-220 layouts. Both share identical pinout (Base–Collector–Emitter), package dimensions, thermal characteristics, and DC ratings except for V_CEO/V_CBO. BDW24ATU's -60 V rating supersedes BDW24's -45 V, offering improved voltage margin without layout changes.

Is BDW24ATU suitable for use in life support equipment?

No. Per Fairchild's Life Support Policy stated in the BDW24ATU datasheet, the device is not authorized for use as a critical component in life support devices or systems. Its qualification level excludes medical safety certification, and failure modes are not characterized for fault-tolerant operation in surgical implant, life-sustaining, or injury-risk scenarios.

BDW24ATU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 6 A

Voltage - Collector Emitter Breakdown (Max):: 60 V

Vce Saturation (Max) @ Ib, Ic:: 3V @ 60mA, 6A

Current - Collector Cutoff (Max):: 500µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 750 @ 2A, 3V

Power - Max:: 50 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

BDW24ATU FAQ

1.How can I place an order for BDW24ATU through Aetrix?

Please submit a Request for Quotation (RFQ) for BDW24ATU 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 BDW24ATU reliable?

The price and inventory of BDW24ATU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDW24ATU is usually 5 days.

3.What payment methods are accepted for BDW24ATU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDW24ATU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BDW24ATU?

BDW24ATU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BDW24ATU 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 BDW24ATU?

For technical support, including BDW24ATU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDW24ATU requirements.

6.How does Aetrix verify that BDW24ATU is sourced from the original manufacturer or authorized distributors?

All BDW24ATU 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 BDW24ATU meets industry standards.

7.What is the process for return or replacement of BDW24ATU?

All BDW24ATU units undergo pre-shipment inspection (PSI). If there is an issue with BDW24ATU, 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 BDW24ATU part is unused and in its original packaging.

Return procedure for BDW24ATU:

1.Submit a request within 90 days.

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

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