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onsemi BDX33CTU
- Part No.:
- BDX33CTU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
BDX33CTU.pdf
- Description:
- TRANS NPN DARL 100V 10A TO-220-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,368
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Product details
Overview
BDX33CTU from ON Semiconductor is a high-gain NPN epitaxial silicon Darlington transistor in TO-220 package, rated for 100 V VCEO, 10 A continuous collector current, and 70 W power dissipation at TC = 25°C. It serves as a robust switching or linear power amplifier in motor drives, power supplies, and industrial control circuits requiring high current gain and rugged thermal performance.
For engineers reviewing the BDX33CTU datasheet, pinout, applications, or equivalent options, key selection criteria include its 100 V blocking capability, minimum hFE of 750 at IC = 3 A, VCE(sat) ≤ 2.5 V, integrated parallel diode (VF = 4 V @ 8 A), and TO-220 mechanical compatibility with heatsink mounting.
Technical Context
The BDX33CTU is a monolithic NPN Darlington pair optimized for high-current linear and switching applications. Its architecture delivers high DC current gain (hFE ≥ 750) with low saturation voltage (VCE(sat) ≤ 2.5 V) and built-in emitter-base clamp diode functionality via internal parallel diode (VF = 4 V @ 8 A).
It operates across -65°C to +150°C junction temperature range and supports pulsed collector current up to 15 A. The device is designed for complementary use with BDX34C series PNP counterparts and requires external base current limiting due to lack of integrated base resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 100 V - Maximum continuous collector-emitter voltage before breakdown; enables use in 80 V DC bus systems with safety margin. |
| IC (DC) | 10 A - Continuous collector current rating; defines maximum steady-state load drive capability without forced cooling. |
| PC (TC=25°C) | 70 W - Thermal power limit at case temperature 25°C; requires heatsink for operation above ~15 W ambient dissipation. |
| hFE | ≥750 @ IC = 3 A - High DC current gain reduces required base drive current, easing driver stage design. |
| VCE(sat) | ≤2.5 V @ IC = 3 A, IB = 6 mA - Low saturation voltage minimizes conduction loss and heat generation in switching mode. |
| VF (diode) | 4 V @ IF = 8 A - Integrated antiparallel diode provides freewheeling path for inductive loads without external component. |
Pinout & Package
BDX33CTU uses the standard TO-220 package with metal tab connected to collector for direct heatsink mounting. Pin assignment is fixed: Pin 1 = Base, Pin 2 = Collector (tab), Pin 3 = Emitter.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Base | Control input terminal; requires external current-limiting resistor to set IB for desired IC drive. |
| Pin 2 / Tab | Collector | Main power output terminal; electrically connected to metal tab for low-inductance heatsink coupling and thermal transfer. |
| Pin 3 | Emitter | Power return path; referenced to system ground or negative rail in common-emitter configurations. |
Key Features
| Feature | Design Value |
|---|---|
| High DC current gain | hFE ≥ 750 ensures minimal base drive current (e.g., ~4 mA to sustain 3 A output), reducing driver complexity. |
| Integrated freewheeling diode | VF = 4 V @ 8 A eliminates need for external flyback diode in relay or solenoid drive applications. |
| TO-220 mechanical standardization | Compatible with industry-standard heatsinks and mounting hardware; tab-isolated variant available for insulated mounting. |
| Complementary pairing | Designed as NPN counterpart to BDX34C; enables matched push-pull or H-bridge output stages with symmetric voltage/current ratings. |
Applications
| DC Motor Control | Linear Power Regulator |
|---|---|
|
Use Scenario: Driving brushed DC motors in industrial actuators or conveyor systems with 24–72 V supply rails. IC Role / Device Role / Timing Role: Main switching element in high-side or low-side configuration, handling peak currents up to 10 A. Use Value: High hFE and low VCE(sat) reduce gate driver burden and conduction losses, improving efficiency and thermal margin. |
Use Scenario: Pass transistor in adjustable linear voltage regulators delivering up to 5 A at <100 V input-output differential. IC Role / Device Role / Timing Role: Series pass element controlling output voltage via base bias modulation. Use Value: 100 V VCEO and 70 W power rating support wide-input, high-dropout linear regulation without cascading devices. |
| Solenoid & Relay Driver | Industrial Heater Control |
|
Use Scenario: Switching 24 V/48 V solenoids and contactors in PLC output modules and HVAC control panels. IC Role / Device Role / Timing Role: High-current switch interfacing microcontroller GPIOs to inductive loads. Use Value: Built-in parallel diode clamps inductive kickback, eliminating external snubber components and board space. |
Use Scenario: Phase-angle or burst-fire control of resistive heating elements in ovens, furnaces, and process equipment. IC Role / Device Role / Timing Role: Main power switch in zero-crossing or random-phase AC solid-state relays. Use Value: 150°C max junction temperature and robust SOA enable reliable operation under repetitive surge conditions typical in heater cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BDX33C (no suffix) | Same die, identical electrical specs; BDX33CTU denotes tape-and-reel packaging per ON Semiconductor's ordering nomenclature. | No functional difference; suitable for same PCB layouts and thermal designs. | Select BDX33CTU for automated SMT assembly; BDX33C for manual or through-hole prototyping. |
| MJD127G | TO-263 package, lower VCEO (80 V), higher hFE (1000 min), no integrated diode. | Requires external flyback diode; better suited for surface-mount designs with tighter space constraints. | Choose MJD127G when board space is limited and external diode integration is acceptable. |
Compared with BDX33CTU, the BDX33C offers identical performance in bulk packaging, while MJD127G trades voltage rating and integrated diode for surface-mount compatibility and higher gain-making each optimal for distinct assembly and layout requirements.
Availability
BDX33CTU is available at Aetrix Electronics and suitable for DC motor control, industrial heater regulation, and solenoid driving applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for BDX33CTU 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 BDX33CTU belongs to ON Semiconductor's legacy power bipolar transistor family, originally developed by Fairchild and optimized for high-current linear and switching applications where ruggedness, gain, and thermal reliability are critical.
FAQ
What is the maximum continuous collector current rating for BDX33CTU?
The BDX33CTU is rated for 10 A continuous collector current (IC) at case temperature TC = 25°C. Derating is required above this temperature per the published power derating curve; at TC = 100°C, maximum IC drops to approximately 4.5 A. This rating assumes proper heatsinking and airflow per TO-220 thermal guidelines.
Does BDX33CTU include an integrated freewheeling diode?
Yes, the BDX33CTU incorporates an internal parallel diode with forward voltage VF = 4 V at 8 A. This diode provides a built-in path for inductive kickback current during turn-off, eliminating the need for an external flyback diode in relay, solenoid, or motor drive applications.
What is the pin configuration of BDX33CTU in TO-220 package?
The BDX33CTU uses standard TO-220 pinout: Pin 1 = Base, Pin 2 = Collector (connected to metal tab), Pin 3 = Emitter. The collector tab must be electrically isolated from heatsink unless circuit topology permits direct connection; insulating pads or shoulder washers are recommended for floating collector applications.
How does BDX33CTU differ from BDX33C?
BDX33CTU and BDX33C share identical die, electrical specifications, and thermal characteristics. The "TU" suffix indicates tape-and-reel packaging per ON Semiconductor's ordering convention, while BDX33C typically denotes tube packaging. Both are functionally interchangeable on the same PCB layout.
Is BDX33CTU suitable for linear regulator applications?
Yes, the BDX33CTU is explicitly designed for linear and switching power applications. With 100 V VCEO, 70 W power dissipation, and low VCE(sat), it functions effectively as a series pass transistor in adjustable linear regulators-especially where high input-output differential and robust thermal performance are required.
BDX33CTU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- NPN - Darlington
- Current - Collector (Ic) (Max):
- 10 A
- Voltage - Collector Emitter Breakdown (Max):
- 100 V
- Vce Saturation (Max) @ Ib, Ic:
- 2.5V @ 6mA, 3A
- Current - Collector Cutoff (Max):
- 500µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 750 @ 3A, 3V
- Power - Max:
- 70 W
- Frequency - Transition:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
BDX33CTU FAQ
1.How can I place an order for BDX33CTU through Aetrix?
Please submit a Request for Quotation (RFQ) for BDX33CTU 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 BDX33CTU reliable?
The price and inventory of BDX33CTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BDX33CTU is usually 5 days.
3.What payment methods are accepted for BDX33CTU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BDX33CTU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BDX33CTU?
BDX33CTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BDX33CTU 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 BDX33CTU?
For technical support, including BDX33CTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BDX33CTU requirements.
6.How does Aetrix verify that BDX33CTU is sourced from the original manufacturer or authorized distributors?
All BDX33CTU 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 BDX33CTU meets industry standards.
7.What is the process for return or replacement of BDX33CTU?
All BDX33CTU units undergo pre-shipment inspection (PSI). If there is an issue with BDX33CTU, 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 BDX33CTU part is unused and in its original packaging.
Return procedure for BDX33CTU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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