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

STMicroelectronics BD244C

Name: BD244C
Brand: STMicroelectronics
SKU: BD244C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BD244C

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: BD244C.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:3,259

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Product details

Overview

BD244C from STMicroelectronics is a complementary silicon PNP power transistor in TO-220 package, designed for medium-power linear and switching applications such as audio amplifiers and motor drivers. It features V_CEO = −100 V, I_C = −6 A, P_tot = 65 W at T_c ≤ 25 °C, and h_FE ≥ 15 at I_C = 3 A, V_CE = 4 V.

For engineers reviewing the BD244C datasheet, BD244C pinout, BD244C application, or BD244C equivalent, key selection criteria include its negative polarity PNP configuration, TO-220 thermal performance (R_thj-case = 1.92 °C/W), safe operating area under pulsed conditions, and compatibility with BD243C NPN counterparts in push-pull output stages.

Technical Context

The BD244C is an epitaxial-base PNP bipolar junction transistor optimized for medium-power analog and switching circuits. Its rated V_CEO = −100 V and I_C = −6 A support operation in Class AB audio outputs and DC motor H-bridge half-bridges, while its 150 °C max junction temperature enables sustained conduction under heatsink-limited thermal conditions.

It exhibits V_CE(sat) = −1.5 V at I_C = −6 A / I_B = −1 A and V_BE = −2 V at I_C = −6 A, confirming low-saturation capability for efficient current sourcing. The device's h_FE drops from ≥30 at 0.3 A to ≥15 at 3 A, indicating predictable gain roll-off suitable for bias-stable amplifier designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−100 V: Maximum reverse-biased collector-emitter voltage before breakdown; defines safe DC rail headroom in PNP high-side switch or emitter-follower configurations.
I_C	−6 A: Continuous collector current rating; supports load driving up to ~72 W into resistive loads with adequate heatsinking.
P_tot	65 W at T_c ≤ 25 °C: Total power dissipation limit at case temperature; requires thermal interface design targeting R_thj-amb ≤ 62.5 °C/W for ambient operation.
h_FE	≥15 at I_C = −3 A, V_CE = −4 V: Minimum DC current gain at mid-load; ensures reliable base drive sizing for switching or linear gain stages.
V_CE(sat)	−1.5 V at I_C = −6 A, I_B = −1 A: Saturation voltage under full-rated current; determines conduction loss and heat generation in saturated-switching mode.
R_thj-case	1.92 °C/W: Junction-to-case thermal resistance; dictates minimum heatsink thermal resistance needed to maintain T_j ≤ 150 °C at full power.

Pinout & Package

BD244C is housed in a standard JEDEC TO-220 plastic package with three leads: Collector (tab), Base (lead 1), Emitter (lead 2), and metal tab electrically connected to collector. Mounting requires insulating hardware when collector is not at chassis ground potential.

Pin/Terminal	Circuit Role	Design Meaning
Lead 1	Base	Control input terminal; requires −1 A peak base current to saturate at −6 A collector current.
Lead 2	Emitter	Current source reference node; tied to positive supply rail in high-side switch or common-emitter amplifier configurations.
Metal Tab	Collector	Main power terminal and thermal path; electrically active and must be isolated unless collector is at system ground or chassis potential.

Key Features

Feature	Design Value
Complementary Pairing	Matched with BD243C (NPN) for push-pull output stages, enabling symmetrical drive and reduced crossover distortion in audio amplifiers.
High V_CEO Rating	−100 V allows operation with ±40 V rails or 80 V single-supply systems without derating, supporting industrial motor control and SMPS auxiliary circuits.
Pulsed SOA Compliance	Rated for 300 µs pulses at ≤2% duty cycle, enabling short-duration surge handling in relay drivers and solenoid interfaces.
TO-220 Thermal Performance	R_thj-case = 1.92 °C/W enables >50 W continuous dissipation with modest heatsinks, reducing thermal subsystem cost vs. larger packages.

Applications

Audio Power Amplifier Output Stage

DC Motor Half-Bridge Driver

Use Scenario: Final output stage of a 20–50 W Class AB audio amplifier driving 4–8 Ω speakers.

IC Role / Device Role / Timing Role: PNP emitter-follower complement to BD243C NPN, sourcing current during positive signal half-cycles.

Use Value: Delivers low-distortion output with V_CE(sat) ≤ −1.5 V and h_FE ≥ 15 at 3 A, minimizing thermal mismatch and crossover notch.

Use Scenario: High-side switch in a unidirectional DC motor driver using PWM at ≤20 kHz.

IC Role / Device Role / Timing Role: PNP power switch controlling motor connection to positive rail; driven by NPN level shifter or logic buffer.

Use Value: Supports 6 A continuous motor current with −100 V V_CEO, allowing operation from 48 V industrial supplies with safety margin.

Linear Voltage Regulator Pass Element

Relay/Solenoid Interface Driver

Use Scenario: Series pass transistor in a 3 A, 24 V adjustable linear regulator with foldback current limiting.

IC Role / Device Role / Timing Role: PNP series regulator element dissipating up to 40 W under worst-case dropout conditions.

Use Value: 65 W P_tot and 150 °C T_j(max) enable stable regulation across ambient temperatures up to 70 °C with standard TO-220 heatsinking.

Use Scenario: Driving 24 V/2 A industrial relays or 12 V/3 A solenoids from microcontroller GPIO via base resistor network.

IC Role / Device Role / Timing Role: Medium-power discrete switch providing galvanic isolation between logic and inductive load.

Use Value: −100 V V_CEO withstands >100 V inductive kickback; −1.5 V V_CE(sat) limits coil driver losses to <9 W at full load.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD243G	TO-263 surface-mount package; lower P_tot = 35 W; V_CEO = −100 V; h_FE ≥ 20 at I_C = −2 A.	Not suitable for through-hole prototyping or high-power heatsink mounting; better for compact PCB layouts with forced-air cooling.	Select when board space is constrained and thermal management uses PCB copper or airflow rather than bulky TO-220 heatsinks.
TIP2955	TO-218 package; higher P_tot = 115 W; V_CEO = −100 V; h_FE ≥ 20 at I_C = −4 A; slower f_T (~100 kHz).	Designed for higher continuous power and ruggedized industrial environments; less suited for audio due to lower bandwidth.	Select when >65 W dissipation is required or mechanical robustness under vibration/shock is critical.

Compared with MJD243G and TIP2955, BD244C offers optimal balance of through-hole serviceability, 65 W thermal capability, and audio-grade gain-bandwidth behavior - making it preferred for medium-power linear designs where TO-220 mounting and thermal accessibility are priorities.

Availability

BD244C is available at Aetrix Electronics and suitable for audio amplifier output stages, DC motor drivers, linear voltage regulators, and relay/solenoid interface circuits requiring stable component supply and long-term industrial availability.

Supply support for BD244C 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, MCU, and automotive ICs with vertical manufacturing and broad industrial qualification.

The BD244C belongs to ST's legacy silicon bipolar power transistor family, engineered for reliability in medium-power linear and switching applications across industrial automation, audio equipment, and power supply subsystems.

FAQ

Is BD244C pin-compatible with BD244B?

Yes, BD244C and BD244B share identical TO-220 pinout (Base–Emitter–Collector), but differ in voltage ratings: BD244B has V_CEO = −80 V versus −100 V for BD244C. Substitution requires verifying that the −80 V rating meets system rail and transient requirements.

Can BD244C be used in parallel for higher current?

Parallel operation is not recommended without individual emitter resistors and matched h_FE/V_BE characteristics. The BD244C lacks built-in current-sharing features, and thermal runaway risk increases due to positive temperature coefficient of V_BE and unequal junction heating.

What is the maximum safe continuous collector current at 70 °C case temperature?

At T_c = 70 °C, derating applies: P_tot reduces linearly from 65 W at 25 °C to zero at 150 °C. At 70 °C, allowable P_tot ≈ 48.8 W. With V_CE(sat) ≈ −1.5 V, max continuous I_C ≈ 32.5 A is unrealistic; practical limit remains −6 A due to bondwire and package current capacity, not just thermal limits.

Does BD244C require a heatsink in all applications?

Yes - even at 1 A collector current, power dissipation exceeds 1 W if V_CE > 1 V. With R_thj-amb = 62.5 °C/W, junction temperature rises >60 °C above ambient without heatsinking. A minimum 10 °C/W heatsink is recommended for any operation above 500 mA continuous current.

BD244C Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

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

BD244C FAQ

1.How can I place an order for BD244C through Aetrix?

Please submit a Request for Quotation (RFQ) for BD244C 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 BD244C reliable?

The price and inventory of BD244C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD244C is usually 5 days.

3.What payment methods are accepted for BD244C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD244C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BD244C?

BD244C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BD244C 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 BD244C?

For technical support, including BD244C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD244C requirements.

6.How does Aetrix verify that BD244C is sourced from the original manufacturer or authorized distributors?

All BD244C 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 BD244C meets industry standards.

7.What is the process for return or replacement of BD244C?

All BD244C units undergo pre-shipment inspection (PSI). If there is an issue with BD244C, 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 BD244C part is unused and in its original packaging.

Return procedure for BD244C:

1.Submit a request within 90 days.

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

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