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

onsemi BD244BTU

Name: BD244BTU
Brand: onsemi
SKU: BD244BTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BD244BTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: BD244BTU.pdf

Description:: TRANS PNP 80V 6A TO-220-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BD244BTU from ON Semiconductor is a PNP epitaxial silicon power transistor in TO-220 package, rated for −80 V V_CEO, −6 A continuous collector current, and 65 W power dissipation at T_C = 25°C. It serves as a medium-power linear amplifier or switching device in DC motor control, power supply regulation, and relay drivers.

For engineers reviewing the BD244BTU datasheet, pinout, applications, or equivalent options, key selection criteria include its −80 V collector-emitter sustaining voltage, h_FE ≥ 30 at I_C = −0.3 A, V_CE(sat) ≤ −1.5 V at I_C = −6 A/I_B = −1 A, and TO-220 thermal performance with case temperature derating.

Technical Context

The BD244BTU operates as a complementary PNP counterpart to the BD243B series, supporting bipolar junction transistor (BJT) push-pull and H-bridge topologies. Its design emphasizes ruggedness in linear-mode operation with specified safe operating area (SOA) curves up to 10 ms pulse width.

It features a fixed three-terminal configuration (Base, Collector, Emitter), requires external base current limiting for saturation control, and exhibits V_BE(on) ≈ −2 V at I_C = −6 A - enabling predictable drive requirements in discrete power stage designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−80 V: Maximum allowable collector-emitter voltage before breakdown under open-base conditions; defines upper rail limit in high-side switch or linear regulator use.
I_C (DC)	−6 A: Continuous collector current rating; sets maximum steady-state load current capability without forced cooling.
P_C	65 W at T_C = 25°C: Thermal power limit at case; requires heatsink sizing based on junction-to-case resistance and ambient conditions.
h_FE	≥30 @ I_C = −0.3 A: Minimum DC current gain at low current; determines minimum base drive needed for light-load switching.
V_CE(sat)	≤ −1.5 V @ I_C = −6 A / I_B = −1 A: Saturation voltage at full-rated current; directly impacts conduction loss and thermal rise in switching applications.
T_J	150°C: Maximum junction temperature; constrains thermal design margin when combined with R_θJC and heatsink performance.

Pinout & Package

BD244BTU uses the standard TO-220 package with vertical mounting orientation, metal tab connected to Collector, and thermally conductive backside for heatsink attachment. Pin numbering follows JEDEC TO-220 outline: Pin 1 = Base, Pin 2 = Collector (tab), Pin 3 = Emitter.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Base	Current-controlled input terminal; requires series resistor to limit I_B and ensure saturation at target I_C.
Pin 2	Collector	Main high-current output terminal; electrically and thermally tied to metal tab; must be isolated from heatsink unless circuit ground reference permits.
Pin 3	Emitter	Common return path for collector and base currents; typically connected to system ground or negative rail in high-side configurations.

Key Features

Feature	Design Value
Complementary Pairing	Designed as direct PNP complement to BD243B NPN transistor, enabling matched push-pull and Class-B amplifier stages.
Rugged SOA	Specified safe operating area up to 10 ms pulse width supports transient overload handling in motor startup and inductive load switching.
High V_CEO(sus)	−80 V sustaining voltage ensures reliable operation in 48 V industrial bus and 60 V automotive auxiliary systems with margin.
TO-220 Thermal Interface	Standardized mechanical footprint and tab geometry allow drop-in replacement into existing heatsink fixtures designed for TO-220 power transistors.

Applications

DC Motor Control	Linear Voltage Regulator
Use Scenario: Bidirectional 24–48 V brushed DC motor control in industrial actuators using H-bridge discrete BJT topology. IC Role / Device Role / Timing Role: High-side PNP switching element providing current sink path during reverse polarity drive phase. Use Value: −80 V V_CEO accommodates back-EMF spikes up to 60 V; 65 W dissipation enables 2–3 A continuous stall current handling with moderate heatsinking.	Use Scenario: Series pass element in adjustable negative linear regulator delivering −5 to −24 V at up to 3 A for analog subsystems. IC Role / Device Role / Timing Role: Power-pass transistor operating in active region to regulate output voltage via feedback-controlled base current. Use Value: h_FE ≥ 30 at low I_C ensures stable loop gain; V_CE(sat) ≤ −1.5 V minimizes dropout voltage under full load.
Relay Driver	Power Supply OR-ing
Use Scenario: High-current coil driver for 24 V industrial relays requiring >500 mA hold current and fast turn-off. IC Role / Device Role / Timing Role: Saturated switch interfacing microcontroller GPIO to inductive relay load with flyback protection. Use Value: −6 A I_C rating provides 5× safety margin over typical 100–200 mA relay coils; TO-220 tab enables direct PCB copper pour heat spreading.	Use Scenario: Discrete OR-ing diode replacement in redundant −12 V or −24 V power distribution networks. IC Role / Device Role / Timing Role: Reverse-polarity configured PNP transistor acting as low-loss ideal diode controller element. Use Value: V_CE(sat) ≤ −1.5 V reduces forward drop by >1 V versus Schottky diodes, cutting conduction loss and thermal load in parallel supply paths.

DC Motor Control

Linear Voltage Regulator

Use Scenario: Bidirectional 24–48 V brushed DC motor control in industrial actuators using H-bridge discrete BJT topology.

IC Role / Device Role / Timing Role: High-side PNP switching element providing current sink path during reverse polarity drive phase.

Use Value: −80 V V_CEO accommodates back-EMF spikes up to 60 V; 65 W dissipation enables 2–3 A continuous stall current handling with moderate heatsinking.

Use Scenario: Series pass element in adjustable negative linear regulator delivering −5 to −24 V at up to 3 A for analog subsystems.

IC Role / Device Role / Timing Role: Power-pass transistor operating in active region to regulate output voltage via feedback-controlled base current.

Use Value: h_FE ≥ 30 at low I_C ensures stable loop gain; V_CE(sat) ≤ −1.5 V minimizes dropout voltage under full load.

Relay Driver

Power Supply OR-ing

Use Scenario: High-current coil driver for 24 V industrial relays requiring >500 mA hold current and fast turn-off.

IC Role / Device Role / Timing Role: Saturated switch interfacing microcontroller GPIO to inductive relay load with flyback protection.

Use Value: −6 A I_C rating provides 5× safety margin over typical 100–200 mA relay coils; TO-220 tab enables direct PCB copper pour heat spreading.

Use Scenario: Discrete OR-ing diode replacement in redundant −12 V or −24 V power distribution networks.

IC Role / Device Role / Timing Role: Reverse-polarity configured PNP transistor acting as low-loss ideal diode controller element.

Use Value: V_CE(sat) ≤ −1.5 V reduces forward drop by >1 V versus Schottky diodes, cutting conduction loss and thermal load in parallel supply paths.

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	Dual-emitter TO-252 (DPAK) package; lower P_C = 25 W; V_CEO = −80 V; h_FE min = 20 @ I_C = −3 A.	Suitable for surface-mount, space-constrained designs with reduced thermal mass; not interchangeable in through-hole TO-220 footprints.	Select MJD244T4G only when board layout mandates DPAK and thermal budget allows lower power dissipation.
BD244CTU	Higher V_CEO = −100 V; identical TO-220 package and pinout; otherwise matched electrical specs and SOA.	Preferred where 48 V+ systems require additional voltage margin against transients exceeding 80 V.	BD244CTU is a direct upgrade path when higher voltage headroom is required; no PCB or drive circuit changes needed.

Compared with BD244BTU, MJD244T4G offers SMT compatibility but sacrifices 40 W of thermal capacity, while BD244CTU delivers identical form-factor performance with +20 V voltage headroom - making it a seamless drop-in option for enhanced transient robustness.

Availability

BD244BTU is available at Aetrix Electronics and suitable for DC motor control, linear voltage regulation, and relay driver applications requiring stable component supply across industrial automation, test equipment, and embedded power subsystems.

Supply support for BD244BTU 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 logic solutions for automotive, industrial, cloud computing, and consumer markets.

The BD244BTU belongs to ON Semiconductor's legacy Fairchild discrete power transistor product line, engineered for robust medium-power linear and switching applications where reliability, thermal stability, and complementary pairing are essential.

FAQ

What is the maximum collector-emitter voltage rating for BD244BTU?

The BD244BTU has a maximum collector-emitter voltage (V_CEO) rating of −80 V at T_C = 25°C. This value is confirmed in the Absolute Maximum Ratings table and matches the V_CEO(sus) specification under I_C = −30 mA and I_B = 0. Exceeding this voltage risks avalanche breakdown and permanent device failure.

Does BD244BTU have a built-in base-emitter resistor?

No, BD244BTU is a standard bipolar junction transistor without any integrated base-emitter resistors. It requires an external base current-limiting resistor to achieve proper saturation or linear biasing. The device datasheet specifies base drive conditions explicitly - for example, I_B = −1 A is required to saturate at I_C = −6 A.

Is BD244BTU pin-compatible with BD244CTU?

Yes, BD244BTU and BD244CTU share identical TO-220 package dimensions, pinout (Base–Collector–Emitter), and mechanical mounting interface. Both devices have the same pin assignment and thermal tab connection, allowing direct physical replacement without PCB modification.

What is the typical DC current gain (h_FE) of BD244BTU at I_C = −3 A?

The BD244BTU datasheet specifies h_FE ≥ 15 at V_CE = −4 V and I_C = −3 A. This minimum guaranteed value ensures sufficient current amplification for medium-current switching applications, though actual units may measure higher depending on process variation and operating temperature.

Can BD244BTU be used in parallel for higher current handling?

BD244BTU is not characterized for guaranteed current sharing in parallel configurations due to h_FE and V_BE parameter spread. Successful paralleling requires individual emitter resistors (typically 0.1–0.22 Ω) to force current balancing and careful thermal coupling to avoid thermal runaway - practices confirmed in Fairchild AN-1037 and ON Semiconductor application guidance for discrete power BJTs.

BD244BTU 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):: 80 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

BD244BTU FAQ

1.How can I place an order for BD244BTU through Aetrix?

Please submit a Request for Quotation (RFQ) for BD244BTU 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 BD244BTU reliable?

The price and inventory of BD244BTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD244BTU is usually 5 days.

3.What payment methods are accepted for BD244BTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD244BTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BD244BTU?

BD244BTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BD244BTU 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 BD244BTU?

For technical support, including BD244BTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD244BTU requirements.

6.How does Aetrix verify that BD244BTU is sourced from the original manufacturer or authorized distributors?

All BD244BTU 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 BD244BTU meets industry standards.

7.What is the process for return or replacement of BD244BTU?

All BD244BTU units undergo pre-shipment inspection (PSI). If there is an issue with BD244BTU, 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 BD244BTU part is unused and in its original packaging.

Return procedure for BD244BTU:

1.Submit a request within 90 days.

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

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