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NXP Semiconductors BUT11APX,127
- Part No.:
- BUT11APX,127
- Manufacturer:
- NXP Semiconductors
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3 Full Pack, Isolated Tab
- Datasheet:
-
BUT11APX,127.pdf
- Description:
- TRANS NPN 450V 5A TO-220F
- Quantity:
- Payment:
- Shipping:
Inventory:6,638
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Product details
Overview
BUT11APX,127 from Nexperia (formerly Philips Semiconductors) is a silicon diffused NPN power transistor in SOT186A (F-pack) package, designed for high-voltage, high-speed horizontal deflection switching in CRT television receivers. It delivers 1000 V peak collector-emitter voltage (VCESM), 5 A DC collector current, 32 W total power dissipation at Ths ≤ 25 °C, and 145 ns fall time under inductive load conditions.
For engineers reviewing the BUT11APX,127 datasheet, BUT11APX,127 pinout, BUT11APX,127 application, or BUT11APX,127 equivalent, key selection criteria include its 450 V VCEO rating, isolated heatsink mounting capability, low worst-case dissipation under base drive variation, and validated RBSOA performance up to 1000 V clamp voltage in flyback converters.
Technical Context
This transistor operates as a primary switch in resonant horizontal output stages, where fast turn-off (tf ≤ 160 ns) and robust reverse-bias safe operating area (RBSOA) are critical to withstand voltage spikes during flyback recovery. Its isolated case enables direct heatsink mounting without insulation washers, reducing thermal resistance to 3.95 K/W with compound.
The BUT11APX,127 features enhanced tolerance to base drive and collector current transients-enabling stable operation across wide line-voltage and temperature ranges (Tj up to 150 °C). Its hFE saturation range (8–17 at IC = 3.5 A) supports predictable drive requirements in fixed-gain driver circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCESM | 1000 V peak - withstands flyback voltage overshoot in CRT horizontal deflection without breakdown |
| VCEO | 450 V - defines maximum DC blocking capability with open base, critical for safe steady-state operation |
| IC / ICM | 5 A DC / 10 A peak - supports sustained horizontal scan current and transient surge during retrace |
| Ptot | 32 W at Ths ≤ 25 °C - enables high-power switching with external heatsink; derates linearly above 25 °C |
| tf (inductive) | 145–160 ns - ensures rapid current decay to minimize switching loss and EMI in 15.625 kHz horizontal systems |
| Rth j-hs | 3.95 K/W max - low thermal resistance enables efficient heat transfer to heatsink using thermal compound |
| Visol | 2500 V RMS - isolation between all terminals and heatsink meets safety standards for mains-referenced CRT supplies |
Pinout & Package
Package: SOT186A (F-pack), plastic full-pack envelope with electrically isolated seating plane and 2 g net mass. Mounting requires 30 ± 5 N force and thermal compound for specified Rth j-hs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input; accepts DC or pulsed drive; IB max = 2 A DC / 4 A peak per limiting values |
| 2 | Collector | High-voltage switched node; connected to horizontal deflection yoke and flyback transformer primary |
| 3 | Emiter | Power return path; tied to ground or low-side current sensing; electrically isolated from heatsink |
| Case | Isolated Heatsink Interface | Electrically isolated terminal; mounts directly to heatsink without insulator; rated for 2500 V RMS isolation |
Key Features
| Feature | Design Value |
|---|---|
| High VCESM | 1000 V rating enables reliable operation in high-energy flyback circuits without snubber overdesign |
| Low Worst-Case Dissipation | Engineered tolerance to base drive and load variation reduces thermal stress margins required in TV designs |
| Isolated Case | Seating plane isolation eliminates need for mica washers or silicone pads-reducing assembly cost and thermal interface resistance |
| RBSOA Validation | Characterized up to 1000 V clamp voltage with 1 µH inductive load-supports robust design of single-transistor converters |
| Fast Fall Time | 145 ns typical tf at Tj = 25 °C ensures minimal overlap loss during high-frequency horizontal switching (15.625 kHz) |
Applications
| Horizontal Deflection Circuit | Flyback Converter Primary Switch |
|---|---|
|
Use Scenario: Horizontal output stage in analog CRT television receivers operating at 15.625 kHz. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling current through deflection yoke and flyback transformer. Use Value: 1000 V VCESM and validated RBSOA prevent failure during flyback voltage spikes; isolated case simplifies heatsinking. |
Use Scenario: Single-transistor forward or flyback converter supplying EHT and logic rails in CRT-based displays. IC Role / Device Role / Timing Role: Main power switch synchronizing with horizontal sync signal to generate regulated secondary outputs. Use Value: 32 W power handling and 145 ns fall time enable efficient energy transfer at 15–20 kHz switching frequencies. |
| Resonant Line Output Stage | High-Voltage Pulse Generator |
|
Use Scenario: Resonant LC tank circuit driving CRT anode voltage generation via voltage multiplier. IC Role / Device Role / Timing Role: Fast-switching element shaping current pulses into resonant network for precise timing control. Use Value: Low storage time (ts ≤ 1.6 µs) and tight hFEsat consistency ensure repeatable pulse width and amplitude. |
Use Scenario: Repetitive high-voltage pulse source for CRT grid modulation or degaussing coil drive. IC Role / Device Role / Timing Role: Peak-current-controlled switch generating controlled 10–100 µs pulses at up to 10 A. Use Value: 10 A ICM rating and 150 °C junction limit support short-duration, high-duty-cycle pulse bursts without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage NPN switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BUT11A,127 | Same die, non-isolated case (SOT186); no 2500 V RMS isolation between terminals and heatsink | Requires insulated mounting hardware; unsuitable where creepage/clearance mandates isolated heatsink contact | Select BUT11A,127 only when mechanical isolation is handled externally and cost reduction is prioritized |
| BUL39D,127 | Higher VCEO (700 V) but lower VCESM (800 V); slower tf (250 ns); different hFE profile and pinout (SOT186A, same) | Better for general-purpose SMPS; less suited for CRT horizontal deflection due to reduced VCESM and slower switching | Choose BUL39D,127 only if system voltage stress stays below 800 V and timing budget allows ≥250 ns fall time |
Compared with BUT11APX,127, BUT11A,127 sacrifices electrical isolation for lower cost, while BUL39D,127 trades peak voltage capability and speed for broader SMPS compatibility-neither is pin-compatible nor drop-in; PCB layout and drive design must be verified per part.
Availability
BUT11APX,127 is available at Aetrix Electronics and suitable for CRT television repair, legacy display power supply redesign, and high-voltage pulse generator development requiring stable component supply and long-lifecycle support.
Supply support for BUT11APX,127 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
Nexperia is a global semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET solutions, spun off from Philips in 2017 with full IP and manufacturing continuity.
The BUT11APX,127 belongs to Nexperia's legacy high-voltage bipolar transistor portfolio, engineered specifically for horizontal deflection and flyback switching in analog video systems where ruggedness and isolation integrity are paramount.
FAQ
What is the maximum junction temperature rating for BUT11APX,127?
The BUT11APX,127 has a maximum junction temperature (Tj) rating of 150 °C, as specified in the Limiting Values table. This rating applies under all operating conditions, including repetitive pulse operation within the Forward Bias Safe Operating Area (FBSOA). Thermal design must ensure that actual Tj remains below this limit, especially when operating at elevated heatsink temperatures or high duty cycles. The BUT11APX,127 datasheet provides derating curves showing normalized power dissipation versus heatsink temperature.
Does BUT11APX,127 support direct heatsink mounting without insulation?
Yes, the BUT11APX,127 features an electrically isolated seating plane, enabling direct mounting to a grounded heatsink without insulating washers or pads. Its Visol rating of 2500 V RMS confirms isolation between all three terminals and the heatsink surface. Mechanical mounting requires 30 ± 5 N force and thermal compound to achieve the specified Rth j-hs of 3.95 K/W. This isolation eliminates risk of short-circuit failure in mains-referenced CRT power stages.
What is the typical fall time of BUT11APX,127 under inductive load conditions?
The BUT11APX,127 has a typical fall time (tf) of 145 ns under inductive load conditions (ICsat = 2.5 A, IB1 = 0.5 A, LB = 1 µH, –VBB = 5 V, Tj = 25 °C), with a maximum of 160 ns. At elevated junction temperature (Tj = 100 °C), tf increases to 160–200 ns. This fast switching performance is essential for minimizing conduction overlap loss in 15.625 kHz horizontal deflection circuits. The BUT11APX,127 datasheet includes oscilloscope waveforms (Fig.6–Fig.7) confirming these values.
Can BUT11APX,127 replace BUT11A,127 in existing designs?
The BUT11APX,127 is not a direct replacement for BUT11A,127 due to its isolated case construction-while both share identical pinout (SOT186A) and electrical characteristics, the BUT11APX,127's isolated seating plane changes mechanical mounting requirements and thermal interface behavior. If the original design relies on case-to-heatsink conduction (non-isolated), substituting BUT11APX,127 may cause thermal or grounding issues. Always verify heatsink isolation, drive circuit grounding, and safety clearance before substitution.
What is the DC current gain (hFE) range of BUT11APX,127 at 3.5 A collector current?
At IC = 3.5 A and VCE = 5 V, the BUT11APX,127 exhibits an hFEsat range of 8–12, as specified in the Static Characteristics table. This saturated gain determines base drive current requirements: for 3.5 A collector current, a minimum IB of ~0.3 A is needed to ensure full saturation. The BUT11APX,127's hFEsat degrades predictably with temperature and current, supporting stable drive design in horizontal deflection circuits where base current is derived from transformer-coupled windings.
BUT11APX,127 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- TO-220-3 Full Pack, Isolated Tab
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 5 A
- Voltage - Collector Emitter Breakdown (Max):
- 450 V
- Vce Saturation (Max) @ Ib, Ic:
- 1.5V @ 600mA, 3A
- Current - Collector Cutoff (Max):
- 1mA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 14 @ 500mA, 5V
- Power - Max:
- 32 W
- Frequency - Transition:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220F
BUT11APX,127 FAQ
1.How can I place an order for BUT11APX,127 through Aetrix?
Please submit a Request for Quotation (RFQ) for BUT11APX,127 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 BUT11APX,127 reliable?
The price and inventory of BUT11APX,127 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUT11APX,127 is usually 5 days.
3.What payment methods are accepted for BUT11APX,127?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUT11APX,127 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUT11APX,127?
BUT11APX,127 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUT11APX,127 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 BUT11APX,127?
For technical support, including BUT11APX,127 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUT11APX,127 requirements.
6.How does Aetrix verify that BUT11APX,127 is sourced from the original manufacturer or authorized distributors?
All BUT11APX,127 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 BUT11APX,127 meets industry standards.
7.What is the process for return or replacement of BUT11APX,127?
All BUT11APX,127 units undergo pre-shipment inspection (PSI). If there is an issue with BUT11APX,127, 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 BUT11APX,127 part is unused and in its original packaging.
Return procedure for BUT11APX,127:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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