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onsemi BD244TU
- Part No.:
- BD244TU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
BD244TU.pdf
- Description:
- TRANS PNP 45V 6A TO-220-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,362
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Product details
Overview
BD244TU from ON Semiconductor is a PNP epitaxial silicon power transistor in TO-220 package, rated for −45 V VCEO, −6 A IC, 65 W PC at TC = 25°C, and 150°C maximum junction temperature, used in medium-power linear regulation and switching applications such as DC motor control and power supply output stages.
For engineers reviewing the BD244TU datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP polarity, TO-220 thermal performance, −45 V collector-emitter sustaining voltage, −1.5 V VCE(sat) at −6 A/−1 A drive, and hFE ≥ 15 at high current - all critical for robust bipolar switching design.
Technical Context
The BD244TU operates as a medium-power PNP bipolar junction transistor with fixed emitter-base and collector-base junction architecture. Its DC current gain (hFE) is specified at 30 (min) at IC = −0.3 A and 15 (min) at IC = −3 A, confirming stable gain across operating range.
It features −1.5 V collector-emitter saturation voltage at IC = −6 A and IB = −1 A, and −2 V base-emitter on voltage under same conditions, enabling predictable drive requirements and low conduction loss in saturated-switching topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V: Maximum safe collector-emitter voltage before breakdown in common-emitter configuration |
| IC (DC) | −6 A: Continuous collector current rating defining steady-state power handling capability |
| PC | 65 W at TC = 25°C: Thermal power limit requiring heatsink for sustained operation above ~25°C case temp |
| VCE(sat) | −1.5 V @ IC = −6 A, IB = −1 A: Confirmed low-saturation drop enabling <10 W conduction loss per device |
| hFE | ≥15 @ IC = −3 A: Minimum current gain ensuring reliable base drive sizing for high-current switching |
| TJ(max) | 150°C: Absolute junction temperature limit dictating thermal design margin and derating curve use |
Pinout & Package
BD244TU uses the standard TO-220 package with 3 leads: Base (lead 1), Collector (lead 2), Emitter (lead 3), mounted on a metal tab thermally connected to the collector. The package provides mechanical stability and direct heatsink mounting via the tab screw hole.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control input terminal | Receives forward-biased current to turn on PNP conduction; requires negative drive relative to emitter |
| 2 (Collector) | High-side current sink | Connected to load supply rail; electrically and thermally tied to metal tab for heatsinking |
| 3 (Emitter) | Reference/output terminal | Serves as common return path; held at higher potential than collector during conduction |
Key Features
| Feature | Design Value |
|---|---|
| TO-220 package | Standardized mechanical footprint with integrated heatsink tab, enabling drop-in replacement and proven thermal reliability |
| −45 V VCEO | Rated for 24–36 V DC bus systems with margin against transients and ripple-induced overvoltage |
| −6 A IC continuous | Supports medium-power loads including solenoids, fans, and relay drivers without parallel devices |
| hFE ≥ 15 @ −3 A | Ensures ≤200 mA base drive requirement, simplifying driver stage design with standard logic-level sources |
Applications
| DC Motor Control | Linear Regulator Pass Element |
|---|---|
Use Scenario: Bidirectional or speed-controlled brushed DC motors in industrial actuators and automotive auxiliary systems. IC Role / Device Role / Timing Role: PNP high-side switch controlling motor current flow from positive rail to load. Use Value: −1.5 V VCE(sat) minimizes heat generation at full load, supporting duty cycles up to 100% with adequate heatsinking. | Use Scenario: Adjustable positive-voltage linear regulators delivering up to 5 A with low dropout and high PSRR. IC Role / Device Role / Timing Role: Series pass transistor regulating output by dissipating excess input-output differential voltage. Use Value: 65 W power dissipation rating enables stable operation at >3 V dropout with proper thermal management. |
| Switched-Mode Power Supply Output Stage | Relay/Solenoid Driver |
Use Scenario: Low-frequency switching output stage in flyback or forward converters where MOSFET gate drive complexity is undesirable. IC Role / Device Role / Timing Role: Saturated-switch PNP transistor replacing MOSFET in cost-sensitive, low-frequency (<100 kHz) SMPS designs. Use Value: Verified −45 V VCEO(sus) ensures safe operation under reflected flyback spikes without snubber overhead. | Use Scenario: Driving 24 V DC relays or 12 V solenoids in PLC I/O modules and HVAC control panels. IC Role / Device Role / Timing Role: High-current interface between microcontroller GPIO and inductive load. Use Value: −6 A IC rating accommodates 5× inrush current of typical 1 A-rated relays, preventing premature failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BD244C | Higher −100 V VCEO, same TO-220 package and pinout | Used where higher voltage margin is required (e.g., 48 V systems with surge tolerance) | Select BD244C only if system transient voltage exceeds −45 V; otherwise BD244TU offers optimal cost/performance balance |
| MJ15024 | Higher −250 V VCEO, −20 A IC, TO-3 package | Designed for high-fidelity audio amplifiers and high-power linear supplies | MJ15024 requires PCB layout change and larger heatsink; suitable only when BD244TU's 65 W rating is insufficient |
Compared with BD244C and MJ15024, the BD244TU delivers optimal thermal efficiency and drive simplicity for 24–36 V industrial switching applications, avoiding over-specification while maintaining proven reliability in TO-220 form factor.
Availability
BD244TU is available at Aetrix Electronics and suitable for DC motor control, linear regulator pass elements, and relay/solenoid driver applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for BD244TU 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 BD244TU belongs to ON Semiconductor's legacy bipolar power transistor product line, designed specifically for cost-effective, thermally robust medium-power linear and switching applications in industrial controls and power conversion.
FAQ
What is the maximum collector-emitter voltage rating for BD244TU?
The BD244TU has a maximum collector-emitter voltage (VCEO) rating of −45 V at TC = 25°C. This value is confirmed in the Absolute Maximum Ratings table and applies to standard DC operation. Exceeding this voltage risks avalanche breakdown, and designers must ensure system transients remain within this limit or select a higher-voltage variant like BD244C.
Does BD244TU have a built-in heatsink tab, and how is it electrically connected?
Yes, the BD244TU uses a TO-220 package with an exposed metal tab that serves as both mechanical mounting surface and thermal interface. The tab is internally connected to the collector terminal, so electrical isolation from the heatsink is required unless the collector is at chassis ground potential. This configuration enables efficient thermal transfer but mandates insulating hardware in most high-side switch implementations.
What is the minimum DC current gain (hFE) of BD244TU at high current?
The BD244TU guarantees a minimum DC current gain (hFE) of 15 when tested at VCE = −4 V and IC = −3 A. This specification ensures predictable base drive requirements under full-load switching conditions and supports conservative driver design using standard logic buffers or discrete transistor stages without excessive gain margin.
Can BD244TU be used as a direct replacement for BD244A or BD244B?
No, BD244TU is not a direct replacement for BD244A (−60 V) or BD244B (−80 V), as its −45 V VCEO rating is lower. Substituting BD244TU in circuits designed for higher-voltage variants may result in premature breakdown under normal operating transients. Always verify voltage stress margins before interchanging BD244 series variants.
What is the collector-emitter saturation voltage of BD244TU under rated current?
The BD244TU exhibits a maximum collector-emitter saturation voltage (VCE(sat)) of −1.5 V when operated at IC = −6 A and IB = −1 A. This measured value defines conduction loss in saturated switching mode and directly impacts thermal design - for example, at full current, conduction loss equals 9 W, requiring appropriate heatsinking to maintain TJ ≤ 150°C.
BD244TU 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):
- 45 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
BD244TU FAQ
1.How can I place an order for BD244TU through Aetrix?
Please submit a Request for Quotation (RFQ) for BD244TU 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 BD244TU reliable?
The price and inventory of BD244TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD244TU is usually 5 days.
3.What payment methods are accepted for BD244TU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD244TU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BD244TU?
BD244TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BD244TU 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 BD244TU?
For technical support, including BD244TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD244TU requirements.
6.How does Aetrix verify that BD244TU is sourced from the original manufacturer or authorized distributors?
All BD244TU 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 BD244TU meets industry standards.
7.What is the process for return or replacement of BD244TU?
All BD244TU units undergo pre-shipment inspection (PSI). If there is an issue with BD244TU, 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 BD244TU part is unused and in its original packaging.
Return procedure for BD244TU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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