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onsemi BUT11ATU-ON
- Part No.:
- BUT11ATU-ON
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
BUT11ATU-ON.pdf
- Description:
- TRANS NPN 450V 5A TO-220-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,420
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Product details
Overview
BUT11ATU-ON from ON Semiconductor (formerly Fairchild) is a high-voltage NPN silicon power transistor designed for switching applications in off-line power supplies, CRT horizontal deflection circuits, and industrial motor controls. It features 1000 V collector-base voltage (VCBO), 450 V collector-emitter sustaining voltage (VCEO(sus)), 5 A DC collector current, 100 W collector dissipation at TC = 25°C, and TO-220 package with isolated mounting tab.
For engineers reviewing the BUT11ATU-ON datasheet, pinout, applications, or equivalent options, key selection criteria include high-voltage blocking capability (≥450 V VCEO), robust pulse current handling (10 A ICP), low saturation voltage (1.5 V VCE(sat) @ IC = 2.5 A/IB = 0.5 A), fast switching performance (1 µs tON, 0.8 µs tF), and thermal resistance (1.25 °C/W RθjC) suitable for heatsink-mounted operation.
Technical Context
The BUT11ATU-ON is a ruggedized planar epitaxial NPN bipolar junction transistor optimized for high-voltage, medium-power switching. Its design emphasizes safe operating area (SOA) integrity under inductive load conditions and reverse-biased SOA compliance up to 1000 V.
It operates with base-controlled turn-on and requires external base drive circuitry - typically a resistor-limited current source - to achieve specified switching times and saturation characteristics. The device is not internally compensated and relies on external snubbers or clamping networks in flyback or forward converter topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 1000 V - Maximum reverse voltage the collector-base junction can block without breakdown; enables use in ≥800 V bus applications. |
| VCEO(sus) | 450 V - Sustaining voltage under switching conditions with IB = 0; defines usable DC blocking range in hard-switched topologies. |
| IC (DC) | 5 A - Continuous collector current rating at TC = 25°C; derates linearly above 25°C case temperature per Figure 6. |
| VCE(sat) | 1.5 V @ IC = 2.5 A, IB = 0.5 A - Low saturation voltage minimizes conduction loss in high-current switching stages. |
| tON / tF | 1 µs / 0.8 µs - Fast turn-on and fall times support operation up to ~500 kHz in optimized layouts with proper base drive. |
| RθjC | 1.25 °C/W - Thermal resistance from junction to case; determines minimum heatsink requirement for given power dissipation. |
| Package | TO-220 - Through-hole, 3-lead, electrically isolated tab; compatible with standard mounting hardware and insulation washers. |
Pinout & Package
TO-220 package with electrically isolated metal tab (pin 2). Pin 1 is Base, Pin 2 is Collector, Pin 3 is Emitter - confirmed per datasheet mechanical drawing and "1.Base 2.Collector 3.Emitter" annotation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Current-controlled input terminal; requires ≥0.5 A DC drive for full saturation at 2.5 A collector current. |
| 2 | Collector | Main high-voltage, high-current output node; connected to heatsink via isolated tab; must be insulated from chassis ground. |
| 3 | Emitter | Low-side return path; referenced to system ground in common-emitter configuration; carries full load current. |
Key Features
| Feature | Design Value |
|---|---|
| High VCBO rating | 1000 V enables direct use in 800 V rectified line applications without series stacking. |
| Robust SOA | Rated for inductive switching with defined reverse-biased SOA (Figure 4); supports reliable operation in flyback converters. |
| Low VCE(sat) | 1.5 V at rated current reduces conduction losses by >30% vs. legacy 2–3 V saturation devices. |
| Fast switching | 1 µs tON + 0.8 µs tF allows efficient operation at 300–500 kHz with minimal overlap loss. |
| Isolated TO-220 tab | Electrically isolated collector tab simplifies heatsinking in grounded-collector configurations (e.g., boost PFC). |
Applications
| Switch-Mode Power Supply (Flyback) | CRT Horizontal Deflection |
|---|---|
Use Scenario: Primary-side switch in universal-input (85–265 VAC), 50–150 W flyback converters for adapters and monitors. IC Role / Device Role / Timing Role: High-voltage switching element driven by PWM controller; handles 450 V VCEO stress during MOSFET replacement retrofit designs. Use Value: Enables cost-effective upgrade from older 400 V transistors while maintaining same PCB layout and heatsink. |
Use Scenario: Horizontal output transistor in analog CRT television and monitor deflection circuits. IC Role / Device Role / Timing Role: Linear-to-switching transition device; sustains 450 V VCEO(sus) during retrace and absorbs flyback energy via external damper network. Use Value: Meets peak voltage requirements of 15–32 kHz horizontal sweep with margin for line surges and ringing. |
| Industrial Motor Starter | AC-DC Converter Snubber Switch |
Use Scenario: Main switching element in single-phase AC induction motor soft-start circuits using phase-angle control. IC Role / Device Role / Timing Role: High-voltage, high-current BJT replacing TRIAC/diac combinations; triggered by optocoupler-isolated gate driver. Use Value: Provides precise current limiting and faster turn-off than thyristors, reducing torque ripple and acoustic noise. |
Use Scenario: Active snubber switch in high-efficiency AC-DC front-end rectifiers with active clamp topology. IC Role / Device Role / Timing Role: Clamps inductive kickback from choke windings; conducts only during brief energy transfer intervals synchronized to main switch. Use Value: Reduces voltage overshoot on main rectifier diodes by >25%, improving reliability and EMI performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage NPN switching transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD127G-ON | Lower VCBO (100 V), higher hFE (1000 min), TO-252 surface-mount package; lacks isolated tab and high-voltage SOA. | Suitable only for low-voltage (<150 V) DC-DC converters; cannot replace BUT11ATU-ON in off-line or CRT applications. | Select only for space-constrained, low-voltage, high-gain switching where isolation and 450+ V blocking are unnecessary. |
| BU508A-STMicro | Same VCBO (1000 V), slightly lower VCEO(sus) (400 V), identical TO-220 package and pinout; 1.3 V VCE(sat) @ IC = 3 A. | Direct functional substitute in most flyback and deflection circuits; validated in ST's AN293 for CRT applications. | Preferred for new designs requiring tighter VCE(sat) tolerance and broader manufacturer support; verify SOA curves match design stress. |
Compared with MJD127G-ON and BU508A-STMicro, BUT11ATU-ON offers superior reverse-biased SOA integrity at 1000 V and proven field reliability in CRT deflection, while BU508A provides marginally better saturation but narrower safe operating margins above 400 V.
Availability
BUT11ATU-ON is available at Aetrix Electronics and suitable for high-voltage power switching, CRT horizontal deflection, and industrial motor starter applications requiring stable component supply and long-term production continuity.
Supply support for BUT11ATU-ON 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 supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud computing, medical, and IoT applications.
The BUT11ATU-ON belongs to ON Semiconductor's legacy high-voltage discrete transistor product line, originally developed by Fairchild for demanding off-line power conversion and analog video deflection systems requiring ruggedness, high-voltage endurance, and predictable SOA behavior.
FAQ
What is the maximum continuous collector current rating for BUT11ATU-ON?
The BUT11ATU-ON has a DC collector current rating of 5 A at case temperature TC = 25°C. This rating decreases linearly with increasing case temperature - dropping to approximately 2.5 A at TC = 100°C per the derating curve in Figure 6 of the datasheet. Operation beyond this limit risks thermal runaway and permanent failure.
Does BUT11ATU-ON have an electrically isolated collector tab?
Yes, the BUT11ATU-ON uses a TO-220 package with an electrically isolated metal tab connected to the collector (Pin 2). This isolation allows direct mounting to a grounded heatsink without shorting the collector to system ground - a critical feature for boost PFC and flyback converter implementations.
Can BUT11ATU-ON replace BUT11A in existing designs?
Yes, BUT11ATU-ON is a direct replacement for BUT11A with identical electrical specifications, pinout, and package. Both share 1000 V VCBO, 450 V VCEO(sus), 5 A IC, and TO-220 footprint. The "TU" suffix denotes tape-and-reel packaging; the die and internal construction are functionally identical.
What is the typical base-emitter saturation voltage for BUT11ATU-ON?
The BUT11ATU-ON exhibits a typical VBE(sat) of 1.3 V when operated at IC = 2.5 A and IB = 0.5 A, as specified in the Electrical Characteristics table. This value remains stable across temperature and ensures predictable base drive requirements for reliable saturation in high-current switching.
Is BUT11ATU-ON suitable for use in resonant LLC converters?
No - the BUT11ATU-ON is a bipolar junction transistor optimized for hard-switched topologies. Its relatively slow storage time (tSTG = 4 µs) and lack of zero-voltage switching (ZVS) optimization make it unsuitable for high-frequency resonant LLC operation, where MOSFETs or GaN devices are preferred for efficiency and timing control.
BUT11ATU-ON Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Bulk
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 5 A
- Voltage - Collector Emitter Breakdown (Max):
- 450 V
- Vce Saturation (Max) @ Ib, Ic:
- 1.5V @ 500mA, 2.5A
- Current - Collector Cutoff (Max):
- 1mA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- -
- Power - Max:
- 100 W
- Frequency - Transition:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
BUT11ATU-ON FAQ
1.How can I place an order for BUT11ATU-ON through Aetrix?
Please submit a Request for Quotation (RFQ) for BUT11ATU-ON 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 BUT11ATU-ON reliable?
The price and inventory of BUT11ATU-ON are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUT11ATU-ON is usually 5 days.
3.What payment methods are accepted for BUT11ATU-ON?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUT11ATU-ON transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUT11ATU-ON?
BUT11ATU-ON orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUT11ATU-ON 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 BUT11ATU-ON?
For technical support, including BUT11ATU-ON datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUT11ATU-ON requirements.
6.How does Aetrix verify that BUT11ATU-ON is sourced from the original manufacturer or authorized distributors?
All BUT11ATU-ON 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 BUT11ATU-ON meets industry standards.
7.What is the process for return or replacement of BUT11ATU-ON?
All BUT11ATU-ON units undergo pre-shipment inspection (PSI). If there is an issue with BUT11ATU-ON, 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 BUT11ATU-ON part is unused and in its original packaging.
Return procedure for BUT11ATU-ON:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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