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

onsemi KSC2751RTU

Name: KSC2751RTU
Brand: onsemi
SKU: KSC2751RTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSC2751RTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-3P-3, SC-65-3

Datasheet:: KSC2751RTU.pdf

Description:: TRANS NPN 400V 15A TO-3P

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSC2751RTU from Fairchild Semiconductor is an NPN epitaxial silicon power transistor designed for high-speed, high-current switching in industrial applications. It features 400 V V_CEO, 15 A DC collector current, 120 W collector dissipation at T_C=25°C, and low saturation voltages (V_CE(sat) = 0.3–1.0 V at I_C=10 A/I_B=2 A). It is commonly used in motor control inverters and induction heating circuits.

For engineers reviewing the KSC2751RTU datasheet, pinout, applications, or equivalent options, key selection criteria include safe operating area (SOA) robustness at 125°C, pulsed current capability (30 A), clamped sustaining voltage (450 V), and TO-3P thermal performance under forced-air cooling.

Technical Context

The KSC2751RTU is a ruggedized planar NPN bipolar junction transistor optimized for hard-switching inductive loads. Its design emphasizes high secondary breakdown immunity, with V_CEX(sus)1 = 450 V under clamped 125°C conditions and SOA derating validated up to 150°C case temperature.

It supports fast switching with t_ON = 1 µs, t_STG = 2.5 µs, and t_F = 0.7 µs at V_CC = 150 V, I_C = 10 A, and matched base drive (I_B1 = –I_B2 = 2 A), enabling efficient operation in 20–50 kHz industrial SMPS and resonant converters.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	400 V - Maximum continuous collector-emitter blocking voltage under open-base condition; defines primary voltage rating for DC/low-frequency switching.
I_C (DC)	15 A - Continuous collector current at T_C = 25°C; usable up to ~9 A at T_C = 100°C per derating curve.
P_C	120 W - Maximum collector power dissipation at T_C = 25°C; requires heatsink with θ_JC ≤ 1.04°C/W for full rating.
V_CE(sat)	0.3–1.0 V @ I_C=10 A, I_B=2 A - Low saturation voltage enables <1.0 W conduction loss at rated current, reducing thermal stress.
t_ON/t_F	1.0 / 0.7 µs - Fast turn-on and fall times support high-frequency hard-switching without excessive switching loss.
hFE	7–80 (I_C = 2–10 A) - Wide DC current gain range supports stable base drive design across load variations.
T_J max	150°C - Maximum junction temperature; SOA and reliability validated up to this limit with proper thermal management.

Pinout & Package

Package: TO-3P (full-molded plastic power package with isolated metal tab; 16.5 mm × 23.4 mm footprint, 19.9 mm height, screw-mount compatible).

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal; requires ≥2 A peak base drive for full saturation at 10 A collector current.
2	Collector	Main high-current output terminal; electrically connected to metal tab - must be insulated from heatsink unless referenced to system ground.
3	Emitter	Power return path; low-inductance connection critical for minimizing switching overshoot in high-di/dt applications.

Key Features

Feature	Design Value
Clamped V_CEX(sus)	450 V at T_C = 125°C with active base clamping - enables reliable operation in inductive snubberless designs.
SOA Compliance	Validated up to 100 V × 10 A (1 ms pulse) and 400 V × 1 A (10 ms), supporting robust short-circuit tolerance.
Thermal Stability	Derated linearly from 120 W at 25°C to 0 W at 175°C case temperature - enables predictable thermal design in sealed enclosures.
Fast Switching	Combined t_ON + t_STG + t_F < 4.2 µs - reduces total switching energy loss below 15 mJ per cycle at 10 A/150 V.

Applications

Motor Drive Inverter Stage	Induction Heating Half-Bridge
Use Scenario: High-power 3-phase inverter driving 5–10 kW AC induction motors in industrial pumps and compressors. IC Role / Device Role / Timing Role: Main switching device in upper/lower leg; operates at 4–16 kHz with forced-air cooling. Use Value: 400 V V_CEO and 450 V clamped sustaining voltage prevent avalanche failure during IGBT-like inductive turn-off transients.	Use Scenario: Resonant half-bridge in 20–50 kHz medium-frequency induction heating systems for metal forging and brazing. IC Role / Device Role / Timing Role: High-current switch handling 15 A peak load current with synchronous base drive. Use Value: Low V_CE(sat) (≤1.0 V) and fast t_F (0.7 µs) minimize conduction and switching losses, improving system efficiency >88%.
DC-DC Converter Primary Switch	Welding Power Supply Output Stage
Use Scenario: 1–3 kW isolated forward or push-pull DC-DC converter in telecom rectifiers and battery chargers. IC Role / Device Role / Timing Role: Primary-side switching transistor; driven with complementary base current (±2 A) for zero-voltage transition assist. Use Value: Verified SOA up to 100 V × 10 A (1 ms) ensures survivability during output short-circuit events without external crowbar.	Use Scenario: Output chopper stage in 3–8 kW arc welding power supplies requiring high peak current delivery. IC Role / Device Role / Timing Role: Duty-cycled main switch controlling electrode current; operated with 10% duty cycle and 30 A pulse rating. Use Value: 30 A pulsed collector current rating and 150°C junction limit allow sustained 200 A-equivalent peak weld current with thermal margin.

Motor Drive Inverter Stage

Induction Heating Half-Bridge

Use Scenario: High-power 3-phase inverter driving 5–10 kW AC induction motors in industrial pumps and compressors.

IC Role / Device Role / Timing Role: Main switching device in upper/lower leg; operates at 4–16 kHz with forced-air cooling.

Use Value: 400 V V_CEO and 450 V clamped sustaining voltage prevent avalanche failure during IGBT-like inductive turn-off transients.

Use Scenario: Resonant half-bridge in 20–50 kHz medium-frequency induction heating systems for metal forging and brazing.

IC Role / Device Role / Timing Role: High-current switch handling 15 A peak load current with synchronous base drive.

Use Value: Low V_CE(sat) (≤1.0 V) and fast t_F (0.7 µs) minimize conduction and switching losses, improving system efficiency >88%.

DC-DC Converter Primary Switch

Welding Power Supply Output Stage

Use Scenario: 1–3 kW isolated forward or push-pull DC-DC converter in telecom rectifiers and battery chargers.

IC Role / Device Role / Timing Role: Primary-side switching transistor; driven with complementary base current (±2 A) for zero-voltage transition assist.

Use Value: Verified SOA up to 100 V × 10 A (1 ms) ensures survivability during output short-circuit events without external crowbar.

Use Scenario: Output chopper stage in 3–8 kW arc welding power supplies requiring high peak current delivery.

IC Role / Device Role / Timing Role: Duty-cycled main switch controlling electrode current; operated with 10% duty cycle and 30 A pulse rating.

Use Value: 30 A pulsed collector current rating and 150°C junction limit allow sustained 200 A-equivalent peak weld current with thermal margin.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage, high-current switching transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ST13007	Lower V_CEO (400 V same), but lower I_C (8 A DC), higher V_CE(sat) (1.5 V), TO-247 package.	Less suitable for >10 A continuous loads; requires larger heatsink due to higher conduction loss.	Acceptable for lower-power (<5 kW) motor drives where cost is prioritized over thermal density.
MJE13009	Same TO-3P package, but lower V_CEO (400 V), lower P_C (100 W), slower t_F (1.2 µs), no clamped V_CEX spec.	Limited SOA at elevated temperature; not recommended for clamped inductive switching above 100°C case.	Functional alternative only in non-clamped, lower-frequency (<5 kHz) applications with conservative thermal margin.

Compared with ST13007 and MJE13009, the KSC2751RTU delivers superior thermal power density (120 W in TO-3P), verified clamped SOA at 125°C, and faster switching-making it preferred for high-reliability industrial inverters where voltage margin and transient robustness are critical.

Availability

KSC2751RTU is available at Aetrix Electronics and suitable for motor drive inverters, induction heating systems, and high-power DC-DC converters requiring stable component supply and long-term industrial lifecycle support.

Supply support for KSC2751RTU 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

Fairchild Semiconductor was a U.S.-based designer of analog and power semiconductors, acquired by ON Semiconductor in 2016; its legacy power transistor portfolio remains widely deployed in industrial equipment.

The KSC2751RTU belongs to Fairchild's high-voltage, high-current bipolar transistor family engineered specifically for ruggedized industrial switching-emphasizing secondary breakdown immunity, clamped SOA, and thermal stability in harsh environments.

FAQ

What is the maximum allowable case temperature for continuous operation of the KSC2751RTU?

The KSC2751RTU is rated for continuous operation up to 150°C case temperature, with power dissipation linearly derated from 120 W at 25°C to 0 W at 175°C. Operation beyond 150°C risks permanent degradation of hFE and increased leakage; thermal design must ensure T_C ≤ 150°C under worst-case ambient and airflow conditions. The KSC2751RTU datasheet provides full derating curves in Figure 8.

Does the KSC2751RTU support base-current-controlled linear operation?

The KSC2751RTU is characterized for switching use, not linear amplification. Its Safe Operating Area (SOA) is defined for pulsed and DC switching conditions-not for extended linear region bias. While hFE is specified at multiple I_C points, the device lacks guaranteed linearity, distortion, or thermal stability data for analog operation. For linear applications, dedicated RF or audio transistors should be selected instead of the KSC2751RTU.

Is the metal tab of the KSC2751RTU internally connected to any pin?

Yes-the metal tab of the KSC2751RTU in TO-3P package is electrically connected to Pin 2 (Collector). This is confirmed by Fairchild's package drawing and continuity testing. When mounting, electrical isolation from the heatsink is mandatory unless the collector node is at system ground potential. Failure to insulate may cause short circuits or ground loops in floating-topology designs using the KSC2751RTU.

What is the minimum base drive current required to saturate the KSC2751RTU at 10 A collector current?

The KSC2751RTU achieves V_CE(sat) ≤ 1.0 V at I_C = 10 A with I_B = 2 A, as specified in the datasheet. A minimum base drive of 2 A peak is required for full saturation; lower drive increases V_CE(sat) nonlinearly and raises conduction loss. Base drive must be sourced/sunk actively (not resistor-limited) to meet t_ON/t_F timing targets. This requirement applies directly to the KSC2751RTU in all hard-switching configurations.

Can the KSC2751RTU replace the KSC2751 without design changes?

Yes-the KSC2751RTU is a tape-and-reel variant of the KSC2751, sharing identical electrical specifications, pinout, package (TO-3P), and thermal characteristics. The "RTU" suffix denotes packaging format only (radial lead, tape-and-reel); no parametric or functional differences exist between KSC2751 and KSC2751RTU. Board layout, drive circuitry, and thermal design for the KSC2751 remain fully valid for the KSC2751RTU.

KSC2751RTU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-3P-3, SC-65-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 15 A

Voltage - Collector Emitter Breakdown (Max):: 400 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 2A, 10A

Current - Collector Cutoff (Max):: 100µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 20 @ 2A, 5V

Power - Max:: 120 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-3P

KSC2751RTU FAQ

1.How can I place an order for KSC2751RTU through Aetrix?

Please submit a Request for Quotation (RFQ) for KSC2751RTU 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 KSC2751RTU reliable?

The price and inventory of KSC2751RTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC2751RTU is usually 5 days.

3.What payment methods are accepted for KSC2751RTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC2751RTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSC2751RTU?

KSC2751RTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSC2751RTU 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 KSC2751RTU?

For technical support, including KSC2751RTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC2751RTU requirements.

6.How does Aetrix verify that KSC2751RTU is sourced from the original manufacturer or authorized distributors?

All KSC2751RTU 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 KSC2751RTU meets industry standards.

7.What is the process for return or replacement of KSC2751RTU?

All KSC2751RTU units undergo pre-shipment inspection (PSI). If there is an issue with KSC2751RTU, 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 KSC2751RTU part is unused and in its original packaging.

Return procedure for KSC2751RTU:

1.Submit a request within 90 days.

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

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