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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

NXP Semiconductors BUT11APX-1200,127

Name: BUT11APX-1200,127
Brand: NXP Semiconductors
SKU: BUT11APX-1200,127
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUT11APX-1200,127

Manufacturer:: NXP Semiconductors

Category:: Single Bipolar Transistors

Package:: TO-220-3 Full Pack, Isolated Tab

Datasheet:: BUT11APX-1200,127.pdf

Description:: TRANS NPN 550V 6A TO-220F

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BUT11APX-1200 from NXP Semiconductors (formerly Philips) is a high-voltage, high-speed NPN silicon diffused power transistor in SOT186A package, rated for 1200 V V_CESM, 6 A DC collector current, and 32 W total power dissipation at T_hs ≤ 25 °C. It is engineered for horizontal deflection circuits in CRT color TV receivers, delivering low worst-case dissipation under base drive and load variation.

For engineers reviewing the BUT11APX-1200 datasheet, BUT11APX-1200 pinout, BUT11APX-1200 application, or BUT11APX-1200 equivalent, key selection criteria include V_CESM = 1200 V, I_C = 6 A, t_f = 170–300 ns (inductive), V_CEsat ≤ 1.0 V at I_C = 2 A / I_B = 0.4 A, and isolated heatsink mounting capability.

Technical Context

The BUT11APX-1200 employs a rugged diffusion process optimized for repetitive high-voltage switching with fast turn-off characteristics. Its design supports operation under severe inductive load conditions-evidenced by t_f = 170 ns (typ) and t_s = 1.5 µs at T_j = 25 °C-with R_{th j-hs} = 3.95 K/W enabling efficient thermal coupling to heatsinks.

It features electrically isolated case construction per SOT186A mechanical specification, supporting safe isolation voltage of 2500 V_RMS (50–60 Hz) between all terminals and heatsink. The device sustains V_CEO = 550 V and exhibits h_FEsat = 15.5 at I_C = 3 A / V_CE = 5 V, ensuring stable saturation under dynamic horizontal scan loads.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CESM	1200 V peak - enables safe clamping during flyback voltage spikes in CRT horizontal deflection.
I_C (DC)	6 A - supports continuous horizontal output current in 50/60 Hz TV scanning.
P_tot	32 W at T_hs ≤ 25 °C - defines maximum steady-state power handling with heatsink compound.
t_f	170–300 ns (inductive load) - ensures rapid current decay to minimize switching loss and EMI.
V_CEsat	≤ 1.0 V at I_C = 2 A / I_B = 0.4 A - reduces conduction loss and self-heating during active period.
R_{th j-hs}	3.95 K/W max - specifies thermal resistance from junction to heatsink, critical for thermal design margin.
V_isol	2500 V_RMS (50–60 Hz) - guarantees reinforced insulation between transistor terminals and metal heatsink.

Pinout & Package

Package: SOT186A (F-pack), plastic full-pack envelope with electrically isolated seating plane; net mass 2 g; dimensions per Fig.15 (15.8 mm × 10.3 mm × 3.2 mm).

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control input for switching; requires I_B ≤ 3 A DC / 5 A peak per limiting values.
2	Collector	High-voltage output node; connected to flyback transformer primary; rated for 1200 V transient.
3	Emitter	Low-side return path; referenced to ground in typical horizontal output stage configuration.
Case	Isolated Heatsink Interface	Electrically isolated from all pins; allows direct mounting to grounded heatsink without insulation pad.

Key Features

Feature	Design Value
High-voltage ruggedness	V_CESM = 1200 V and V_CBO = 1200 V support reliable operation in CRT flyback circuits with high energy transients.
Fast fall time	t_f = 170 ns typ (inductive load) minimizes switching loss and improves efficiency in 15.625 kHz horizontal scanning.
Low saturation voltage	V_CEsat ≤ 0.15 V typ at I_C = 2 A / I_B = 0.4 A reduces conduction loss and thermal stress during active scan.
Electrically isolated case	Enables direct heatsink mounting without insulating washers-reducing thermal resistance and assembly cost.
Wide safe operating area	Reverse bias SOA validated up to 1200 V clamp voltage and 10 A peak current (Fig.13), supporting robust fault tolerance.

Applications

Horizontal Deflection in CRT TVs	High-Voltage Flyback Switching
Use Scenario: Horizontal output stage in analog color television receivers driving flyback transformers at ~15.625 kHz. IC Role / Device Role / Timing Role: Primary high-voltage switch controlling energy transfer to flyback transformer and EHT generation. Use Value: Low worst-case dissipation and 1200 V V_CESM ensure reliability across line voltage variations and aging components.	Use Scenario: Repetitive high-voltage switching in legacy monitor and projection TV flyback supplies. IC Role / Device Role / Timing Role: Main switching element in resonant or quasi-resonant flyback topologies requiring fast turn-off. Use Value: t_f ≤ 300 ns and R_{th j-hs} = 3.95 K/W enable stable thermal performance under sustained 10 A peak currents.
Inductive Load Protection Circuits	Legacy Broadcast Equipment Output Stages
Use Scenario: Snubberless inductive switching in industrial deflection or pulse generator systems. IC Role / Device Role / Timing Role: High-energy switch managing stored inductor energy with minimal external protection. Use Value: Validated reverse bias SOA up to 1200 V / 10 A eliminates need for complex clamping networks.	Use Scenario: Video signal amplification and sweep generation in professional broadcast monitors and test equipment. IC Role / Device Role / Timing Role: Horizontal output transistor in high-stability timing-critical video deflection circuits. Use Value: Tight h_FEsat = 15.5 (min) at 3 A ensures consistent gain and predictable switching thresholds over temperature.

Horizontal Deflection in CRT TVs

High-Voltage Flyback Switching

Use Scenario: Horizontal output stage in analog color television receivers driving flyback transformers at ~15.625 kHz.

IC Role / Device Role / Timing Role: Primary high-voltage switch controlling energy transfer to flyback transformer and EHT generation.

Use Value: Low worst-case dissipation and 1200 V V_CESM ensure reliability across line voltage variations and aging components.

Use Scenario: Repetitive high-voltage switching in legacy monitor and projection TV flyback supplies.

IC Role / Device Role / Timing Role: Main switching element in resonant or quasi-resonant flyback topologies requiring fast turn-off.

Use Value: t_f ≤ 300 ns and R_{th j-hs} = 3.95 K/W enable stable thermal performance under sustained 10 A peak currents.

Inductive Load Protection Circuits

Legacy Broadcast Equipment Output Stages

Use Scenario: Snubberless inductive switching in industrial deflection or pulse generator systems.

IC Role / Device Role / Timing Role: High-energy switch managing stored inductor energy with minimal external protection.

Use Value: Validated reverse bias SOA up to 1200 V / 10 A eliminates need for complex clamping networks.

Use Scenario: Video signal amplification and sweep generation in professional broadcast monitors and test equipment.

IC Role / Device Role / Timing Role: Horizontal output transistor in high-stability timing-critical video deflection circuits.

Use Value: Tight h_FEsat = 15.5 (min) at 3 A ensures consistent gain and predictable switching thresholds over temperature.

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
BUT11A	V_CESM = 1200 V, but P_tot = 25 W (lower), R_{th j-hs} = 5.0 K/W (higher), no isolated case.	Lacks electrically isolated case; requires insulating pad for heatsink mounting; lower power derating.	Select BUT11A only if thermal budget permits higher R_th and isolation is handled externally.
BUT11AX	V_CESM = 1200 V, same SOT186A package and isolated case, but t_f = 250 ns (max) vs. 300 ns for BUT11APX-1200.	Identical mechanical and isolation specs; slightly tighter fall time spec but identical application scope.	BUT11AX is a functionally aligned variant with marginally improved dynamic performance; suitable for drop-in evaluation.

Compared with BUT11A and BUT11AX, the BUT11APX-1200 offers superior thermal performance (R_{th j-hs} = 3.95 K/W), confirmed isolated case construction, and validated 1200 V clamping capability-making it the preferred choice for thermally constrained or safety-critical CRT horizontal stages.

Availability

BUT11APX-1200 is available at Aetrix Electronics and suitable for CRT television repair, legacy broadcast equipment maintenance, and industrial deflection circuit refurbishment requiring stable component supply and long-lifecycle support.

Supply support for BUT11APX-1200 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

NXP Semiconductors is a global semiconductor company formed from the spin-off of Philips' semiconductor division, specializing in high-reliability analog, power, and interface solutions.

The BUT11APX-1200 belongs to NXP's legacy high-voltage power transistor product line, designed specifically for robust horizontal deflection and flyback switching in analog video systems where voltage endurance and thermal stability are critical.

FAQ

What is the maximum allowable collector-emitter voltage for BUT11APX-1200?

The BUT11APX-1200 has a peak collector-emitter voltage rating (V_CESM) of 1200 V under open-base conditions with V_BE = 0 V. This value is defined per IEC 134 Absolute Maximum Ratings and represents the highest non-repetitive voltage the device can withstand during flyback transients in horizontal deflection circuits. Exceeding this limit risks permanent breakdown.

Does BUT11APX-1200 require an insulating pad when mounted to a heatsink?

No, the BUT11APX-1200 does not require an insulating pad. Its SOT186A package features an electrically isolated seating plane, allowing direct mounting to a grounded heatsink. This design reduces thermal resistance (R_{th j-hs} = 3.95 K/W max) and simplifies mechanical assembly while maintaining safety isolation up to 2500 V_RMS.

What is the typical fall time of BUT11APX-1200 under inductive load conditions?

The BUT11APX-1200 exhibits a typical fall time (t_f) of 170 ns under inductive load conditions (I_Csat = 2.5 A, I_B1 = 0.5 A, L_B = 1 µH, –V_BB = 5 V, T_j = 25 °C). The maximum specified value is 300 ns, making it suitable for 15.625 kHz horizontal scanning where fast current decay minimizes switching loss and EMI generation.

Can BUT11APX-1200 replace BUT11A in existing CRT TV designs?

Yes, BUT11APX-1200 can replace BUT11A in most CRT TV horizontal output stages, provided thermal design accounts for its higher power dissipation capability (32 W vs. 25 W) and lower R_{th j-hs}. However, the BUT11APX-1200's isolated case eliminates the need for an insulating pad-requiring verification that heatsink mounting pressure and flatness meet SOT186A mechanical tolerances.

What is the DC current gain (h_FEsat) of BUT11APX-1200 at typical operating conditions?

The BUT11APX-1200 delivers h_FEsat = 15.5 (minimum) at I_C = 3.0 A and V_CE = 5 V. This saturated current gain ensures stable base drive requirements in horizontal deflection circuits, supporting predictable turn-on behavior and consistent power delivery across unit-to-unit and temperature variations.

BUT11APX-1200,127 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):: 6 A

Voltage - Collector Emitter Breakdown (Max):: 550 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 400mA, 2A

Current - Collector Cutoff (Max):: 1mA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 20 @ 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-1200,127 FAQ

1.How can I place an order for BUT11APX-1200,127 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUT11APX-1200,127 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-1200,127 reliable?

The price and inventory of BUT11APX-1200,127 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUT11APX-1200,127 is usually 5 days.

3.What payment methods are accepted for BUT11APX-1200,127?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUT11APX-1200,127 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUT11APX-1200,127?

BUT11APX-1200,127 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUT11APX-1200,127 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-1200,127?

For technical support, including BUT11APX-1200,127 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUT11APX-1200,127 requirements.

6.How does Aetrix verify that BUT11APX-1200,127 is sourced from the original manufacturer or authorized distributors?

All BUT11APX-1200,127 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-1200,127 meets industry standards.

7.What is the process for return or replacement of BUT11APX-1200,127?

All BUT11APX-1200,127 units undergo pre-shipment inspection (PSI). If there is an issue with BUT11APX-1200,127, 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-1200,127 part is unused and in its original packaging.

Return procedure for BUT11APX-1200,127:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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