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

onsemi BD240BTU

Name: BD240BTU
Brand: onsemi
SKU: BD240BTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BD240BTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: BD240BTU.pdf

Description:: TRANS PNP 80V 2A TO-220-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BD240BTU from ON Semiconductor is a PNP epitaxial silicon power transistor in TO-220 package, rated for -60 V V_CEO, -2 A DC collector current, 30 W power dissipation at T_C = 25°C, and 150°C maximum junction temperature. It serves as a medium-power linear amplifier or switching device in DC motor drivers, power supplies, and relay drivers.

For engineers reviewing the BD240BTU datasheet, pinout, applications, or equivalent options, key selection criteria include V_CEO rating, h_FE consistency at 1 A, V_CE(sat) under specified drive conditions, thermal derating behavior, and complementary pairing with BD239B devices.

Technical Context

The BD240BTU operates as a standard PNP bipolar junction transistor with fixed-base control architecture and no integrated protection circuitry. Its DC current gain (h_FE) is specified at 15 minimum when I_C = -1 A and V_CE = -4 V, and its saturation voltage is -0.7 V at I_C = -1 A and I_B = -0.2 A.

It features a V_CEO(sus) of -60 V under I_C = -30 mA and I_B = 0, and exhibits I_CEO ≤ -0.3 mA at V_CE = -60 V for BD240B variants. The device is not designed for RF or high-speed switching above 1 MHz.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-60 V - Maximum allowable collector-to-emitter voltage before breakdown in open-base configuration
I_C (DC)	-2 A - Continuous collector current limit requiring heatsink for sustained operation
P_C	30 W - Total power dissipation at case temperature of 25°C; derates linearly above 25°C
h_FE	15 min @ I_C = -1 A - Minimum DC current gain defining base drive requirement for full conduction
V_CE(sat)	-0.7 V @ I_C = -1 A, I_B = -0.2 A - Saturation voltage determining conduction loss in switching applications
T_J max	150°C - Absolute maximum junction temperature; requires thermal design to maintain below this limit

Pinout & Package

BD240BTU uses the standard TO-220 package with 3 leads: Base (pin 1), Collector (pin 2), Emitter (pin 3). The metal tab is electrically connected to the collector and must be isolated from other conductive surfaces unless intentional collector connection is required.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input	Receives forward-biased current to turn on transistor; requires current-limiting resistor in series
2 (Collector)	High-side current sink	Connected to load supply rail; metal tab is collector and must be electrically isolated or grounded per layout
3 (Emitter)	Current return path	Typically tied to system ground or negative rail; defines reference for base-emitter bias

Key Features

Feature	Design Value
Complementary pairing	Designed as PNP counterpart to BD239B NPN transistor for push-pull output stages
Medium-power handling	30 W dissipation enables use in 10–25 W linear regulators and Class AB audio output stages
Robust V_CEO(sus)	-60 V sustaining voltage supports reliable operation in 48 V industrial bus systems
Thermal stability	150°C T_J max allows operation in enclosed enclosures with limited airflow when properly heatsinked

Applications

DC Motor Control	Linear Power Supply
Use Scenario: Driving 24 V brushed DC motors in industrial actuators with PWM-based speed control. IC Role / Device Role / Timing Role: PNP switch sinking current from motor winding to ground during active low-side switching phase. Use Value: -60 V V_CEO provides 2× margin over 24 V rail; -2 A I_C supports motors up to 40 W mechanical output.	Use Scenario: Pass transistor in adjustable linear regulator delivering up to 1.5 A at 5–12 V from 24 V input. IC Role / Device Role / Timing Role: Series pass element regulating output voltage via base-controlled conduction. Use Value: 30 W P_C enables safe operation at 12 V dropout × 1.5 A = 18 W dissipation with appropriate heatsink.
Relay Driver	Audio Output Stage
Use Scenario: Driving 12 V/500 mA electromagnetic relays in PLC I/O modules. IC Role / Device Role / Timing Role: High-side switch controlling relay coil current with base-driven saturation. Use Value: -0.7 V V_CE(sat) ensures minimal coil voltage drop, maintaining >11.3 V across relay for reliable pull-in.	Use Scenario: Complementary emitter-follower output stage in 5 W Class AB audio amplifier. IC Role / Device Role / Timing Role: PNP output device sourcing current to speaker load in push-pull configuration. Use Value: h_FE ≥ 15 at 1 A ensures stable biasing and low distortion when paired with BD239B.

DC Motor Control

Linear Power Supply

Use Scenario: Driving 24 V brushed DC motors in industrial actuators with PWM-based speed control.

IC Role / Device Role / Timing Role: PNP switch sinking current from motor winding to ground during active low-side switching phase.

Use Value: -60 V V_CEO provides 2× margin over 24 V rail; -2 A I_C supports motors up to 40 W mechanical output.

Use Scenario: Pass transistor in adjustable linear regulator delivering up to 1.5 A at 5–12 V from 24 V input.

IC Role / Device Role / Timing Role: Series pass element regulating output voltage via base-controlled conduction.

Use Value: 30 W P_C enables safe operation at 12 V dropout × 1.5 A = 18 W dissipation with appropriate heatsink.

Relay Driver

Audio Output Stage

Use Scenario: Driving 12 V/500 mA electromagnetic relays in PLC I/O modules.

IC Role / Device Role / Timing Role: High-side switch controlling relay coil current with base-driven saturation.

Use Value: -0.7 V V_CE(sat) ensures minimal coil voltage drop, maintaining >11.3 V across relay for reliable pull-in.

Use Scenario: Complementary emitter-follower output stage in 5 W Class AB audio amplifier.

IC Role / Device Role / Timing Role: PNP output device sourcing current to speaker load in push-pull configuration.

Use Value: h_FE ≥ 15 at 1 A ensures stable biasing and low distortion when paired with BD239B.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD243G	V_CEO = -60 V, I_C = -3 A, TO-263 package, higher h_FE (20–100)	Suitable for surface-mount designs; requires PCB rework for TO-220 footprint	Select when SMT assembly and higher gain consistency are prioritized over through-hole mounting
BD241C	V_CEO = -100 V, same TO-220 package and pinout, but higher voltage rating and lower h_FE (10 min)	Compatible in same socket but over-spec'd for 60 V systems; may require base drive adjustment	Select when future-proofing for higher bus voltages or enhanced avalanche robustness is needed

Compared with BD240BTU, MJD243G offers superior gain and SMT compatibility but demands layout change, while BD241C retains identical mounting and improves voltage margin at the cost of reduced DC gain and tighter base drive control.

Availability

BD240BTU is available at Aetrix Electronics and suitable for DC motor control, linear power supply regulation, and relay driver circuits requiring stable component supply and long-term industrial availability.

Supply support for BD240BTU 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

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

The BD240BTU belongs to ON Semiconductor's legacy bipolar power transistor product line, engineered for robust, cost-effective medium-power linear and switching applications in industrial controls and power conversion.

FAQ

What is the maximum continuous collector current rating for BD240BTU?

The BD240BTU has a maximum continuous collector current (I_C) rating of -2 A at T_C = 25°C. This rating assumes adequate heatsinking; current must be derated linearly as case temperature rises above 25°C, reaching zero at approximately 105°C case temperature based on its 30 W power dissipation limit and thermal resistance.

Does BD240BTU have a built-in base-emitter resistor or protection diode?

No, BD240BTU is a standard discrete PNP bipolar transistor without integrated resistors or protection diodes. External base current limiting and flyback diodes must be added in switching applications. Its pinout and electrical behavior match traditional BJT topology, requiring full external bias network design as confirmed in the official ON Semiconductor datasheet for BD240B variants.

Is BD240BTU pin-compatible with BD240CTU or BD240ATU?

Yes, BD240BTU shares identical TO-220 package, pinout (Base–Collector–Emitter), and mechanical dimensions with BD240ATU and BD240CTU. However, their absolute maximum ratings differ: BD240ATU is rated for -60 V V_CEO, BD240BTU for -60 V, and BD240CTU for -100 V. Electrical characteristics such as h_FE and V_CE(sat) remain consistent across the BD240x family at equivalent test conditions.

What is the typical V_CE(sat) of BD240BTU under standard switching conditions?

The BD240BTU exhibits a typical V_CE(sat) of -0.7 V when operated at I_C = -1 A and I_B = -0.2 A, as specified in the ON Semiconductor BD240B datasheet. This value reflects hard saturation under defined drive conditions and is critical for calculating conduction losses in switching applications like relay or lamp drivers.

Can BD240BTU be used in audio amplifier output stages?

Yes, BD240BTU is commonly deployed in Class AB audio output stages as the PNP complement to BD239B. Its h_FE ≥ 15 at -1 A and V_CE = -4 V supports stable quiescent current setting, while its 30 W power rating accommodates short-term power peaks in 5–10 W amplifiers when mounted on an appropriate heatsink.

BD240BTU 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):: 2 A

Voltage - Collector Emitter Breakdown (Max):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 700mV @ 200mA, 1A

Current - Collector Cutoff (Max):: 300µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 15 @ 1A, 4V

Power - Max:: 30 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

BD240BTU FAQ

1.How can I place an order for BD240BTU through Aetrix?

Please submit a Request for Quotation (RFQ) for BD240BTU 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 BD240BTU reliable?

The price and inventory of BD240BTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD240BTU is usually 5 days.

3.What payment methods are accepted for BD240BTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD240BTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BD240BTU?

BD240BTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BD240BTU 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 BD240BTU?

For technical support, including BD240BTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD240BTU requirements.

6.How does Aetrix verify that BD240BTU is sourced from the original manufacturer or authorized distributors?

All BD240BTU 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 BD240BTU meets industry standards.

7.What is the process for return or replacement of BD240BTU?

All BD240BTU units undergo pre-shipment inspection (PSI). If there is an issue with BD240BTU, 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 BD240BTU part is unused and in its original packaging.

Return procedure for BD240BTU:

1.Submit a request within 90 days.

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

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