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onsemi BD240CTU
- Part No.:
- BD240CTU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
BD240CTU.pdf
- Description:
- TRANS PNP 100V 2A TO-220-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,132
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Product details
Overview
BD240CTU from ON Semiconductor is a PNP epitaxial silicon power transistor in TO-220 package, rated for -100 V VCEO, -2 A DC collector current, and 30 W power dissipation at TC = 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 BD240CTU datasheet, pinout, applications, or equivalent options, key selection criteria include VCEO/VCER rating, hFE consistency at IC = -1 A, VCE(sat) under specified drive, thermal derating behavior, and complementary pairing with BD239CTU.
Technical Context
The BD240CTU is a discrete PNP bipolar junction transistor optimized for medium-power linear and switching applications. Its design supports operation up to 150°C junction temperature and features a VCEO of -100 V and VCER of -115 V, enabling use in higher-voltage DC circuits where robust breakdown margin is required.
It delivers hFE ≥ 15 at IC = -1 A and VCE = -4 V, with VCE(sat) ≤ -0.7 V at IC = -1 A and IB = -0.2 A - confirming suitability for saturated-switching roles requiring low conduction loss and predictable base drive requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -100 V - maximum collector-emitter voltage before avalanche breakdown under open-base condition |
| VCER | -115 V - enhanced collector-emitter sustaining voltage with base-emitter shorted, improving ruggedness in inductive switching |
| IC (DC) | -2 A - continuous collector current rating defining safe linear/switching operation without thermal runaway at TC ≤ 25°C |
| PC | 30 W - maximum collector power dissipation at case temperature 25°C; requires heatsinking above ~10 W |
| hFE | 15 min @ IC = -1 A - minimum DC current gain ensuring reliable saturation with standard ±0.2 A base drive |
| VCE(sat) | ≤ -0.7 V @ IC = -1 A, IB = -0.2 A - low saturation voltage reduces conduction loss and self-heating in switching mode |
| TJ | 150°C - maximum allowable junction temperature, setting thermal design limits for PCB layout and heatsink sizing |
Pinout & Package
BD240CTU uses the standard TO-220 package with 3 leads: emitter, base, and collector. The package features a metal tab (collector-connected) for mechanical mounting and thermal conduction to heatsinks.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Left) | Base | Control terminal; accepts negative current to turn on PNP device; requires current-limiting resistor in series with driver |
| 2 (Middle) | Collector | Main high-side current path; electrically connected to metal tab; must be isolated from heatsink unless collector is at system ground potential |
| 3 (Right) | Emitter | Common reference terminal; typically tied to positive rail in high-side switch configurations |
Key Features
| Feature | Design Value |
|---|---|
| High VCER rating (-115 V) | Enables safe operation in inductive load switching (e.g., solenoids, relays) with flyback voltage spikes up to -115 V |
| Complementary pairing with BD239CTU | Allows matched NPN/PNP push-pull output stages in audio amplifiers or H-bridge drivers without gain or timing mismatch |
| TO-220 mechanical robustness | Supports >10⁵ thermal cycles and >5 kgf mounting torque, suitable for industrial equipment with vibration and thermal cycling |
| hFE guaranteed ≥15 at IC = -1 A | Ensures consistent base drive design across production lots, eliminating need for per-unit bias trimming in volume manufacturing |
Applications
| DC Motor Control | Linear Power Supply Regulator |
|---|---|
Use Scenario: Bidirectional 24 V DC brushed motor control using half-H-bridge topology with external freewheeling diodes. IC Role / Device Role / Timing Role: High-side PNP switch providing controlled current sourcing to motor terminals during forward rotation. Use Value: VCER = -115 V withstands back-EMF spikes up to 115 V, preventing destructive breakdown during motor commutation. | Use Scenario: Series pass element in adjustable 3–24 V, 1.5 A linear regulator with LM317-based reference and feedback network. IC Role / Device Role / Timing Role: Main power-handling transistor dissipating excess input-output differential voltage as heat. Use Value: 30 W power rating and TO-220 thermal interface enable stable 1.5 A output at 15 V dropout without forced-air cooling. |
| Relay Driver Circuit | Audio Output Stage |
Use Scenario: Driving 12 V, 400 mW electromagnetic relay coil with microcontroller GPIO via base resistor. IC Role / Device Role / Timing Role: Saturated PNP switch turning relay on by sinking coil current through emitter to +12 V rail. Use Value: VCE(sat) ≤ -0.7 V minimizes power loss in transistor (≤700 mW), reducing thermal stress and enabling compact PCB layout. | Use Scenario: Complementary emitter-follower output stage in Class AB audio amplifier delivering 5 W into 8 Ω speaker load. IC Role / Device Role / Timing Role: PNP output device sourcing current to speaker during negative half-cycle of audio waveform. Use Value: Matched hFE and VCE(sat) with BD239CTU ensures symmetrical distortion profile and low crossover distortion. |
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 | VCEO = -100 V, IC = -3 A, TO-263 package, no metal tab connection to collector | Suitable for surface-mount designs; lacks direct mechanical heatsink interface; higher IC but lower hFE (min 10 @ -1 A) | Select when board space is constrained and thermal management uses copper pour instead of bolt-on heatsink |
| BD241C | NPN counterpart with identical VCEO/IC/PC ratings, same TO-220 outline, complementary hFE curve | Used in NPN-side of push-pull or complementary symmetry circuits; not interchangeable as direct replacement | Choose only when building matched NPN/PNP pairs - BD241C complements BD240CTU but does not replace it |
Compared with MJD243G and BD241C, the BD240CTU offers proven through-hole reliability, collector-tab thermal path, and guaranteed hFE ≥15 at -1 A - making it preferred for industrial relay drivers and linear regulators where mechanical robustness and predictable gain are critical.
Availability
BD240CTU is available at Aetrix Electronics and suitable for DC motor control, linear power supply regulation, and relay driver applications requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing from authorized channels.
Supply support for BD240CTU 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 BD240CTU belongs to ON Semiconductor's legacy Fairchild discrete transistor portfolio, designed specifically for medium-power linear amplification and robust switching in industrial control, power conversion, and electromechanical actuation systems.
FAQ
What is the maximum collector-emitter voltage rating for BD240CTU?
The BD240CTU has a VCEO rating of -100 V and a higher VCER rating of -115 V when the base-emitter junction is shorted. This dual rating allows the BD240CTU to safely handle transient overvoltages in inductive switching applications. Always refer to the absolute maximum ratings table in the official ON Semiconductor datasheet for BD240CTU to ensure compliance with derating curves at elevated temperatures.
Is BD240CTU pin-compatible with BD240C or BD240B variants?
Yes - BD240CTU shares identical TO-220 package dimensions, pinout (1=Base, 2=Collector, 3=Emitter), and mechanical footprint with all BD240x variants (A/B/C). The "TU" suffix denotes tape-and-reel packaging per ON Semiconductor's post-Fairchild nomenclature update; electrical specifications match BD240C, including -100 V VCEO and -115 V VCER.
Does BD240CTU have a built-in base-emitter resistor?
No, BD240CTU is a standard discrete PNP bipolar transistor without any integrated resistors. It requires an external base current-limiting resistor to establish proper bias conditions. This gives designers full control over switching speed, saturation depth, and thermal stability - unlike digital transistors which embed resistors and limit flexibility in high-reliability applications.
Can BD240CTU be used in parallel for higher current handling?
Parallel operation of BD240CTU devices is not recommended without individual emitter resistors and matched hFE sorting. Due to inherent parameter variation, unbalanced current sharing can occur, leading to thermal runaway in one device. For >2 A applications, consider a single higher-rated device such as MJ15003 or use active current-balancing circuitry when paralleling BD240CTU units.
What is the thermal resistance from junction to case (RθJC) for BD240CTU?
The BD240CTU has a typical RθJC of 1.7°C/W, measured from junction to the metal tab (collector). This value enables accurate heatsink sizing when the tab is mounted to a thermally conductive surface with appropriate insulating washer and thermal compound. Derate power dissipation linearly above 25°C case temperature using the published thermal resistance curve in the BD240CTU datasheet.
BD240CTU 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):
- 2 A
- Voltage - Collector Emitter Breakdown (Max):
- 100 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 200mA, 1A
- Current - Collector Cutoff (Max):
- 300µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 15 @ 1A, 4V
- Power - Max:
- 30 W
- Frequency - Transition:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
BD240CTU FAQ
1.How can I place an order for BD240CTU through Aetrix?
Please submit a Request for Quotation (RFQ) for BD240CTU 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 BD240CTU reliable?
The price and inventory of BD240CTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BD240CTU is usually 5 days.
3.What payment methods are accepted for BD240CTU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BD240CTU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BD240CTU?
BD240CTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BD240CTU 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 BD240CTU?
For technical support, including BD240CTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BD240CTU requirements.
6.How does Aetrix verify that BD240CTU is sourced from the original manufacturer or authorized distributors?
All BD240CTU 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 BD240CTU meets industry standards.
7.What is the process for return or replacement of BD240CTU?
All BD240CTU units undergo pre-shipment inspection (PSI). If there is an issue with BD240CTU, 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 BD240CTU part is unused and in its original packaging.
Return procedure for BD240CTU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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