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onsemi BD244B
- Part No.:
- BD244B
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
BD244B.pdf
- Description:
- TRANS PNP 80V 6A TO-220
- Quantity:
- Payment:
- Shipping:
Inventory:8,280
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Product details
Overview
BD244B from ON Semiconductor is a PNP epitaxial silicon power transistor in TO-220 package, rated for −80 V VCEO, −6 A continuous collector current, 65 W power dissipation at TC = 25°C, with DC current gain (hFE) ≥30 at IC = −0.3 A and ≥15 at IC = −3 A. It serves as a medium-power linear amplifier or switching device in DC motor drives, power supplies, and relay drivers.
For engineers reviewing the BD244B datasheet, pinout, applications, or equivalent options, key selection considerations include its −80 V VCEO rating, TO-220 thermal performance, complementary pairing with BD243B, safe operating area (SOA) limits, and base-emitter saturation voltage of −2 V at −6 A.
Technical Context
The BD244B operates as a PNP bipolar junction transistor with fixed emitter-base and collector-base junction architecture. Its design supports linear-mode amplification with stable hFE across −0.3 A to −3 A, and switching operation with VCE(sat) ≤ −1.5 V at IC = −6 A and IB = −1 A.
Thermal management is defined by its TO-220 package: junction-to-case thermal resistance (RθJC) enables 65 W dissipation at 25°C case temperature, derating linearly to zero at 150°C junction temperature. Safe operating area (SOA) is validated for pulse widths down to 10 µs and DC conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −80 V - Maximum sustainable collector-emitter voltage before breakdown under open-base condition; defines upper voltage limit in switching and linear applications. |
| IC (DC) | −6 A - Continuous collector current capability; determines maximum load drive capacity in motor control or power regulation circuits. |
| PC (TC=25°C) | 65 W - Steady-state power dissipation at 25°C case temperature; sets heatsink sizing baseline for thermal design. |
| hFE | 30 (min) at IC = −0.3 A - Ensures reliable base drive margin in low-current switching; 15 (min) at IC = −3 A supports high-current gain stability. |
| VCE(sat) | ≤ −1.5 V at IC = −6 A, IB = −1 A - Limits conduction loss and self-heating during saturated switching; critical for efficiency in H-bridge or driver stages. |
| VBE(on) | −2 V at IC = −6 A - Defines required base drive voltage swing; impacts base resistor selection and driver stage compatibility. |
Pinout & Package
BD244B uses the standard TO-220 package with three leads: lead 1 (Base), lead 2 (Collector), lead 3 (Emitter), mounted on a metal tab that is electrically connected to the Collector terminal. The package provides mechanical robustness and thermal path to heatsinks via the tab.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control input terminal | Receives forward-biased current to turn on the transistor; requires −1 A drive for full saturation at −6 A collector current. |
| 2 (Collector) | Main current output terminal (tab-connected) | Electrically tied to the metal mounting tab; must be isolated from heatsink unless circuit topology permits common-collector configuration. |
| 3 (Emitter) | Main current return terminal | Connected to system ground or high-side rail in PNP configurations; carries full load current and defines reference for base drive. |
Key Features
| Feature | Design Value |
|---|---|
| Complementary pairing | Explicitly designed as PNP counterpart to BD243B (NPN), enabling matched push-pull or complementary symmetry in amplifier and driver stages. |
| High VCEO rating | −80 V enables use in 48 V industrial bus systems and flyback snubber circuits without derating or series stacking. |
| Robust SOA | Validated safe operating area up to DC and 10 µs pulses supports both linear regulation and hard-switching applications without secondary breakdown risk. |
| TO-220 thermal interface | Standardized footprint and tab geometry allow direct integration with off-the-shelf heatsinks and thermal interface materials. |
Applications
| DC Motor Control | Linear Voltage Regulator |
|---|---|
|
Use Scenario: Driving brushed DC motors in industrial actuators requiring bidirectional control via H-bridge topology. IC Role / Device Role / Timing Role: PNP high-side switch in complementary pair with NPN BD243B; handles reverse current commutation and regenerative braking paths. Use Value: −80 V VCEO withstands inductive kickback spikes up to 60 V; −6 A IC supports motors drawing ≤5 A continuous load. |
Use Scenario: Pass element in adjustable negative-voltage linear regulators for analog instrumentation subsystems. IC Role / Device Role / Timing Role: Series pass transistor regulating −5 V to −24 V outputs; dissipates heat directly through TO-220 tab to heatsink. Use Value: 65 W power rating allows ≥3 W dissipation at 75°C ambient; hFE ≥15 at −3 A ensures stable loop gain under full load. |
| Relay Driver Circuit | Power Supply Foldback Protection |
|
Use Scenario: High-current coil driver for industrial 24 VDC relays with >1 A hold current. IC Role / Device Role / Timing Role: Saturated switch interfacing microcontroller GPIO to relay coil; base driven via current-limiting resistor. Use Value: VCE(sat) ≤ −1.5 V minimizes coil voltage drop; −6 A rating accommodates relay inrush currents up to 4 A. |
Use Scenario: Current-limiting element in foldback protection circuit for −12 V/−15 V SMPS auxiliary rails. IC Role / Device Role / Timing Role: Active current-sense transistor controlling foldback threshold; biased by sense resistor and error amplifier. Use Value: ICEO ≤ −0.7 mA at −60 V ensures negligible leakage-induced false triggering; VCEO(sus) = −80 V maintains reliability during overvoltage events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD244 | Surface-mount DPAK package; same −80 V VCEO, −6 A IC, but lower PC = 25 W; hFE min 20 at −3 A. | Designed for automated PCB assembly; unsuitable for high-power linear operation due to thermal limits. | Select MJD244 only when space-constrained layouts and reflow compatibility outweigh thermal performance needs. |
| BD244C | Higher −100 V VCEO rating; identical package, pinout, and thermal specs; hFE and VCE(sat) match BD244B within tolerance. | Direct upgrade path where higher voltage margin is required, e.g., 72 V battery systems or surge-prone industrial inputs. | BD244C is a drop-in replacement if −100 V rating is needed; verify SOA curves remain compatible at elevated voltage. |
Compared with BD244B, MJD244 trades thermal capability for SMT manufacturability, while BD244C extends voltage headroom without altering footprint or drive requirements-making BD244C the preferred alternative for voltage-margin-critical designs.
Availability
BD244B is available at Aetrix Electronics and suitable for DC motor control, linear voltage regulation, and relay driver applications requiring stable component supply, long-term industrial lifecycle support, and consistent TO-220 mechanical compatibility.
Supply support for BD244B 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 BD244B belongs to ON Semiconductor's legacy power bipolar transistor product line, engineered for medium-power linear and switching applications where ruggedness, predictable SOA, and complementary NPN/PNP pairing are essential.
FAQ
What is the maximum collector-emitter voltage rating for BD244B?
The BD244B has a maximum collector-emitter voltage (VCEO) rating of −80 V at TC = 25°C. This value is confirmed in the Absolute Maximum Ratings table and applies under open-base conditions. Exceeding this voltage risks avalanche breakdown and permanent device failure. Derating is required above 25°C case temperature per the published power derating curve.
Is BD244B pin-compatible with BD243B?
BD244B is not pin-compatible with BD243B-the two are complementary transistors (PNP vs. NPN) with identical TO-220 pinout (Base–Collector–Emitter), but opposite polarity and biasing requirements. While they share the same physical pin assignment (lead 1 = Base, lead 2 = Collector, lead 3 = Emitter), BD244B cannot substitute for BD243B in circuit without reversing supply polarity and drive logic.
What is the typical base-emitter on voltage for BD244B at full load?
The BD244B exhibits a typical base-emitter on voltage (VBE(on)) of −2 V when operating at IC = −6 A and VCE = −4 V. This value is specified in the Electrical Characteristics table and reflects the forward-biased junction drop needed to sustain full collector current; it directly informs base resistor sizing in discrete driver circuits.
Can BD244B be used in linear amplifier applications?
Yes, BD244B is explicitly characterized for linear amplifier use, with DC current gain (hFE) guaranteed ≥30 at IC = −0.3 A and ≥15 at IC = −3 A. Its SOA curve includes DC operation, and thermal design using the TO-220 package supports stable quiescent biasing-making BD244B suitable for Class-A or Class-AB audio and instrumentation amplifier output stages.
Does BD244B have a built-in base-emitter resistor?
No, BD244B is a standard three-terminal bipolar junction transistor with no internal base-emitter resistor. It requires external base biasing-either via current-limiting resistors or active driver circuits-to control conduction. This distinguishes it from digital transistors (e.g., MMDT series) and confirms its use in precision analog and high-fidelity switching applications.
BD244B 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:
- 3MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
BD244B FAQ
1.How can I place an order for BD244B through Aetrix?
Please submit a Request for Quotation (RFQ) for BD244B 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 BD244B reliable?
The price and inventory of BD244B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD244B is usually 5 days.
3.What payment methods are accepted for BD244B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD244B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BD244B?
BD244B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BD244B 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 BD244B?
For technical support, including BD244B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD244B requirements.
6.How does Aetrix verify that BD244B is sourced from the original manufacturer or authorized distributors?
All BD244B 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 BD244B meets industry standards.
7.What is the process for return or replacement of BD244B?
All BD244B units undergo pre-shipment inspection (PSI). If there is an issue with BD244B, 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 BD244B part is unused and in its original packaging.
Return procedure for BD244B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BD244B Tags
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MMBT3906-7-F
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MMBT2222A-7-F
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BC846BLT1G
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BC847B,215
Nexperia USA Inc.
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