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

onsemi BD244CTU

Name: BD244CTU
Brand: onsemi
SKU: BD244CTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BD244CTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: BD244CTU.pdf

Description:: TRANS PNP 100V 6A TO-220-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BD244CTU from onsemi is a complementary PNP silicon power transistor in TO-220 package, rated for 100 V_CEO, 6 A continuous collector current, and 65 W dissipation at T_C = 25°C, used in linear amplifiers, switching regulators, and motor control stages.

For engineers reviewing the BD244CTU datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, safe operating area limits, and direct alternatives for high-current bipolar switching designs.

Technical Context

The BD244CTU operates as a medium-power PNP bipolar junction transistor with DC current gain (h_FE) ≥15 at I_C = 3.0 A and V_CE = 4.0 V, V_CE(sat) ≤1.5 V at I_C = 6.0 A / I_B = 1.0 A, and f_T = 3.0 MHz under specified test conditions.

It features a single-die TO-220-3 package with pins 1–Base, 2–Collector, 3–Emitter, 4–Collector (dual-collector configuration), and exhibits thermal resistance R_JC = 1.92 °C/W - enabling stable operation up to +150°C junction temperature when properly heatsinked.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	100 Vdc - supports switching or amplification in 48 V and 72 V industrial bus systems without breakdown.
I_C (continuous)	6 Adc - delivers sufficient drive for solenoids, relay coils, and small DC motors up to ~75 W mechanical output.
P_D @ T_C = 25°C	65 W - requires minimum 1.92 °C/W heatsink thermal resistance to maintain T_J ≤150°C at full load.
h_FE	≥15 @ I_C = 3.0 A - enables base drive current ≤200 mA for full collector conduction, simplifying driver stage design.
V_CE(sat)	≤1.5 V @ I_C/I_B = 6 A/1 A - limits conduction loss to ≤9 W at full current, critical for thermal management in Class-B amplifiers.
f_T	3.0 MHz - supports audio-frequency switching (e.g., PWM motor control up to ~200 kHz) with adequate gain margin.

Pinout & Package

BD244CTU uses the TO-220-3 (Case 221A, Style 1) package with metal tab connected to Collector (pins 2 and 4). Pin 1 is Base, pin 3 is Emitter, and pins 2 & 4 are internally tied Collector terminals - enabling dual-path current routing and improved thermal/power handling.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input requiring ~1 A peak base current to saturate at 6 A collector load; must be driven with current-limited source.
2 & 4	Collector	Dual-collector terminals tied internally - allows parallel PCB traces or dual heatsink mounting to reduce thermal resistance and current density.
3	Emitter	Common emitter node for PNP operation; connects to positive rail in high-side switch configurations.

Key Features

Feature	Design Value
Complementary PNP pairing	Matched with BD243C (NPN) for push-pull amplifier stages - identical voltage/current ratings and thermal profiles enable balanced Class-AB operation.
Pb-free RoHS-compliant construction	Meets EU Directive 2011/65/EU and JEDEC J-STD-609A - eliminates lead-based solder compatibility concerns in modern assembly lines.
Second-breakdown SOA compliance	Rated for 5.0 ms pulse at 100 V / 5 A (T_J = 150°C) - ensures reliability in inductive load switching without snubber networks.
High-temperature junction rating	Operates continuously from −65°C to +150°C - suitable for under-hood automotive modules and industrial enclosures without forced cooling.

Applications

Audio Power Amplifier	DC Motor Driver
Use Scenario: Push-pull output stage in 20–50 W stereo amplifiers driving 4–8 Ω speakers. IC Role / Device Role / Timing Role: PNP output transistor delivering negative half-cycle current in complementary pair with BD243C. Use Value: V_CEO = 100 V and h_FE ≥15 ensure low-distortion linear operation up to 20 kHz with minimal bias current drift over temperature.	Use Scenario: High-side switch controlling brushed DC motors in robotics and actuation systems (12–48 V). IC Role / Device Role / Timing Role: PNP power switch sourcing current to motor windings during ON state; driven by microcontroller via base resistor network. Use Value: Dual-collector (pins 2 & 4) configuration reduces trace resistance and improves thermal coupling to heatsink - sustaining 6 A continuous without thermal runaway.
Linear Voltage Regulator	Switching Power Supply
Use Scenario: Pass transistor in adjustable 3–30 V, 5 A linear regulators for lab bench supplies and instrumentation. IC Role / Device Role / Timing Role: Series pass element dissipating excess input-output differential voltage as heat. Use Value: R_JC = 1.92 °C/W and 65 W rating allow regulation from 40 V input to 5 V output at 5 A with ≤100°C case rise - enabling compact heatsink design.	Use Scenario: Main switch in 100–300 W flyback or forward converters operating at ≤100 kHz. IC Role / Device Role / Timing Role: Hard-switched PNP transistor turning ON/OFF under base current control in primary-side switching stage. Use Value: f_T = 3.0 MHz and defined turn-on/off times support clean square-wave switching with <1 μs transition periods - minimizing overlap loss at 100 kHz.

Audio Power Amplifier

DC Motor Driver

Use Scenario: Push-pull output stage in 20–50 W stereo amplifiers driving 4–8 Ω speakers.

IC Role / Device Role / Timing Role: PNP output transistor delivering negative half-cycle current in complementary pair with BD243C.

Use Value: V_CEO = 100 V and h_FE ≥15 ensure low-distortion linear operation up to 20 kHz with minimal bias current drift over temperature.

Use Scenario: High-side switch controlling brushed DC motors in robotics and actuation systems (12–48 V).

IC Role / Device Role / Timing Role: PNP power switch sourcing current to motor windings during ON state; driven by microcontroller via base resistor network.

Use Value: Dual-collector (pins 2 & 4) configuration reduces trace resistance and improves thermal coupling to heatsink - sustaining 6 A continuous without thermal runaway.

Linear Voltage Regulator

Switching Power Supply

Use Scenario: Pass transistor in adjustable 3–30 V, 5 A linear regulators for lab bench supplies and instrumentation.

IC Role / Device Role / Timing Role: Series pass element dissipating excess input-output differential voltage as heat.

Use Value: R_JC = 1.92 °C/W and 65 W rating allow regulation from 40 V input to 5 V output at 5 A with ≤100°C case rise - enabling compact heatsink design.

Use Scenario: Main switch in 100–300 W flyback or forward converters operating at ≤100 kHz.

IC Role / Device Role / Timing Role: Hard-switched PNP transistor turning ON/OFF under base current control in primary-side switching stage.

Use Value: f_T = 3.0 MHz and defined turn-on/off times support clean square-wave switching with <1 μs transition periods - minimizing overlap loss at 100 kHz.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD244T4G	TO-252 (DPAK) surface-mount package; same V_CEO = 100 V, I_C = 6 A, but lower P_D = 25 W and R_JC = 3.0 °C/W.	Suitable only for space-constrained PCBs with moderate power density; not recommended for >3 A continuous without aggressive copper pour.	Select MJD244T4G only when board-level reflow assembly and footprint reduction outweigh thermal performance needs.
BD244B	Same TO-220 package and pinout, but lower V_CEO = 80 V and reduced SOA - no 100 V pulse capability above 1 ms.	Acceptable in 24–48 V systems where maximum transient voltage stays below 70 V; unsuitable for 72 V battery or surge-prone inputs.	Choose BD244B only if cost sensitivity outweighs need for 100 V margin and extended second-breakdown endurance.

Compared with BD244CTU, MJD244T4G trades thermal robustness for SMT compatibility, while BD244B sacrifices voltage headroom and pulse SOA for lower unit cost - making BD244CTU the optimal choice for thermally demanding, high-voltage PNP switching where reliability is prioritized.

Availability

BD244CTU is available at Aetrix Electronics and suitable for audio amplifiers, DC motor drivers, linear voltage regulators, and switching power supplies requiring stable component supply across production lifecycles.

Supply support for BD244CTU 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

BD244CTU belongs to onsemi's complementary silicon power transistor family, engineered for rugged, high-current linear and switching roles in analog power stages where bipolar performance and thermal resilience are critical.

FAQ

What is the maximum continuous collector current rating for BD244CTU?

The BD244CTU is rated for 6 A continuous collector current (I_C) at case temperature T_C = 25°C. Derating applies above 25°C at 0.52 W/°C, meaning usable current drops to ~4.5 A at T_C = 55°C. This rating assumes proper heatsinking per R_JC = 1.92 °C/W and adherence to SOA limits in Figure 5 of the official onsemi datasheet.

Does BD244CTU have a built-in base-emitter resistor?

No, BD244CTU does not include an integrated base-emitter resistor. It is a standard bipolar junction transistor requiring external base drive circuitry - typically a current-limiting resistor or active driver stage - to establish correct bias and prevent thermal runaway. The device's base-emitter cutoff current (I_EBO) is ≤1.0 mA at V_BE = 5.0 V, confirming absence of internal shunt paths.

Can BD244CTU be used as a direct replacement for BD244B in existing designs?

BD244CTU can replace BD244B electrically and mechanically (same TO-220 package and pinout), but offers higher V_CEO (100 V vs. 80 V) and extended SOA - particularly beneficial in 72 V systems or those subject to voltage transients. No PCB changes are needed, though layout review is advised if operating near BD244B's original 80 V limit.

What is the safe operating area (SOA) limitation for BD244CTU at 100 V?

At V_CE = 100 V, BD244CTU's SOA permits up to 5 A for 5 ms pulses (T_J = 150°C), per Figure 5 in the onsemi datasheet. Continuous operation at 100 V is not allowed - maximum DC current at that voltage is limited by thermal dissipation to ~0.65 A (65 W / 100 V). Pulse operation must respect both second-breakdown and thermal boundaries.

Is BD244CTU RoHS compliant and halogen-free?

Yes, BD244CTU is Pb-free and RoHS compliant per EU Directive 2011/65/EU, as confirmed in the onsemi datasheet revision 16 (April 2024). The "G" suffix in the ordering code (e.g., BD244CG) denotes the Pb-free package. It meets JESD201A Class 2a for antimony and JESD201A Class 3 for halogens - fully halogen-free per industry standards.

BD244CTU 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):: 100 V

Vce Saturation (Max) @ Ib, Ic:: 1.5V @ 1A, 6A

Current - Collector Cutoff (Max):: 700µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 15 @ 3A, 4V

Power - Max:: 65 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

BD244CTU FAQ

1.How can I place an order for BD244CTU through Aetrix?

Please submit a Request for Quotation (RFQ) for BD244CTU 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 BD244CTU reliable?

The price and inventory of BD244CTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD244CTU is usually 5 days.

3.What payment methods are accepted for BD244CTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD244CTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BD244CTU?

BD244CTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BD244CTU 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 BD244CTU?

For technical support, including BD244CTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD244CTU requirements.

6.How does Aetrix verify that BD244CTU is sourced from the original manufacturer or authorized distributors?

All BD244CTU 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 BD244CTU meets industry standards.

7.What is the process for return or replacement of BD244CTU?

All BD244CTU units undergo pre-shipment inspection (PSI). If there is an issue with BD244CTU, 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 BD244CTU part is unused and in its original packaging.

Return procedure for BD244CTU:

1.Submit a request within 90 days.

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

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