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

onsemi KSC4010OTU

Name: KSC4010OTU
Brand: onsemi
SKU: KSC4010OTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSC4010OTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: KSC4010OTU.pdf

Description:: TRANS NPN 120V 6A TO-3PN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSC4010OTU from ON Semiconductor (formerly Fairchild) is an NPN epitaxial silicon power transistor designed for high-current audio amplifier output stages, featuring V_CEO = 120 V, I_C = 6 A DC, P_C = 60 W at T_C = 25°C, h_FE = 55–160, and TO-3P package with Base–Collector–Emitter pinout. It operates in linear mode for Class AB audio output.

For engineers reviewing the KSC4010OTU datasheet, pinout, applications, or equivalent options, key selection criteria include safe operating area (SOA) robustness, DC current gain linearity at I_C = 1–5 A, V_CE(sat) ≤ 2.5 V under I_C = 5 A / I_B = 0.5 A, thermal derating above 25°C, and complementary pairing with KSA3010OTU.

Technical Context

This bipolar junction transistor uses epitaxial base construction to support high-voltage blocking (V_CBO = 120 V) and high-current conduction (I_CP = 12 A pulsed). Its SOA curve is specified up to 100 ms single-pulse, enabling reliable operation in audio output stage switching transients and overload conditions.

DC current gain h_FE is binned into R (55–110) and O (80–160) classifications; V_BE(on) ≤ 1.5 V at I_C = 5 A confirms low base drive requirement, while f_T = 30 MHz supports stable high-frequency compensation in wideband amplifiers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	120 V - Sustains full rail voltage in ±60 V audio power supplies without breakdown
I_C (DC)	6 A - Supports ≥50 W continuous sine-wave output into 8 Ω loads in Class AB
P_C	60 W @ T_C = 25°C - Requires heatsink with θ_JA ≤ 2.08°C/W for 150°C max junction
h_FE	55–160 - Enables stable bias design across production lots with minimal emitter degeneration
V_CE(sat)	≤ 2.5 V @ I_C = 5 A, I_B = 0.5 A - Limits conduction loss to ≤12.5 W at full output current
f_T	30 MHz - Permits stable dominant-pole compensation up to ~200 kHz open-loop bandwidth
C_ob	90 pF @ V_CB = 10 V - Constrains Miller capacitance impact on high-frequency stability

Pinout & Package

TO-3P metal package with isolated collector tab, 3-pin through-hole mounting, 23.4 mm × 19.9 mm footprint, 16.5 mm height, and screw-hole center-to-center spacing of 13.9 mm.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Low-impedance control input requiring 0.5 A drive for full 5 A output saturation
2	Collector	Electrically connected to metal case - must be insulated from heatsink unless common-collector topology
3	Emitter	Reference node for output stage; carries full load current and sets emitter degeneration resistor value

Key Features

Feature	Design Value
High Safe Operating Area (SOA)	Rated for 100 ms single-pulse I_C = 12 A at V_CE = 100 V - enables robust short-circuit tolerance in audio outputs
Complementary Pairing	Explicitly matched to KSA3010OTU as PNP counterpart - ensures symmetrical push-pull stage performance
Linear Mode Optimized	h_FE flatness maintained from I_C = 0.1 A to 5 A - minimizes distortion in Class AB bias regions
Thermal Stability	Junction temperature limit 150°C with defined derating slope - supports reliable operation under sustained 75% power output

Applications

Hi-Fi Audio Amplifier Output Stage	Professional PA System Driver
Use Scenario: Final output stage in discrete Class AB amplifier delivering 30–100 W into 4–8 Ω loads with THD < 0.1% at 1 kHz. IC Role / Device Role / Timing Role: NPN power switch conducting load current during positive half-cycle; paired with KSA3010OTU for push-pull symmetry. Use Value: V_CEO = 120 V and SOA compliance ensure no secondary breakdown at ±55 V rails; h_FE consistency reduces need for per-unit bias trimming.	Use Scenario: High-reliability driver in 200 W professional loudspeaker management systems operating continuously at 60°C ambient. IC Role / Device Role / Timing Role: Linear power transistor handling peak music program current up to 10 A with 100 ms pulse capability. Use Value: 60 W dissipation rating and defined thermal derating allow predictable heatsink sizing; TO-3P mechanical robustness withstands vibration in touring rigs.
Discrete Power Supply Pass Element	Industrial Motor Control Pre-driver
Use Scenario: Series pass transistor in adjustable 0–100 V / 0–5 A bench power supply with foldback current limiting. IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output by varying V_BE via error amplifier feedback. Use Value: V_CE(sat) ≤ 2.5 V at 5 A limits dropout voltage; Cob = 90 pF avoids instability in high-gain error amp loop.	Use Scenario: Medium-power pre-driver stage controlling gate voltage of 100 A IGBT modules in 3-phase inverters (≤20 kHz PWM). IC Role / Device Role / Timing Role: High-current buffer amplifying microcontroller PWM signals before IGBT gate drive transformers. Use Value: f_T = 30 MHz ensures faithful PWM edge reproduction; I_C = 6 A supports fast transformer primary charging without saturation.

Hi-Fi Audio Amplifier Output Stage

Professional PA System Driver

Use Scenario: Final output stage in discrete Class AB amplifier delivering 30–100 W into 4–8 Ω loads with THD < 0.1% at 1 kHz.

IC Role / Device Role / Timing Role: NPN power switch conducting load current during positive half-cycle; paired with KSA3010OTU for push-pull symmetry.

Use Value: V_CEO = 120 V and SOA compliance ensure no secondary breakdown at ±55 V rails; h_FE consistency reduces need for per-unit bias trimming.

Use Scenario: High-reliability driver in 200 W professional loudspeaker management systems operating continuously at 60°C ambient.

IC Role / Device Role / Timing Role: Linear power transistor handling peak music program current up to 10 A with 100 ms pulse capability.

Use Value: 60 W dissipation rating and defined thermal derating allow predictable heatsink sizing; TO-3P mechanical robustness withstands vibration in touring rigs.

Discrete Power Supply Pass Element

Industrial Motor Control Pre-driver

Use Scenario: Series pass transistor in adjustable 0–100 V / 0–5 A bench power supply with foldback current limiting.

IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output by varying V_BE via error amplifier feedback.

Use Value: V_CE(sat) ≤ 2.5 V at 5 A limits dropout voltage; Cob = 90 pF avoids instability in high-gain error amp loop.

Use Scenario: Medium-power pre-driver stage controlling gate voltage of 100 A IGBT modules in 3-phase inverters (≤20 kHz PWM).

IC Role / Device Role / Timing Role: High-current buffer amplifying microcontroller PWM signals before IGBT gate drive transformers.

Use Value: f_T = 30 MHz ensures faithful PWM edge reproduction; I_C = 6 A supports fast transformer primary charging without saturation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD44H11T4	V_CEO = 80 V, I_C = 8 A, TO-220AB package, no isolated collector	Limited to ≤±40 V supplies; requires insulating washer only if heatsink grounded	Choose when lower voltage rating suffices and PCB-mount is preferred over TO-3P mechanical rigidity
2SC5200	V_CEO = 230 V, I_C = 15 A, TO-3PL package, h_FE = 80–160, higher f_T (≥30 MHz)	Supports wider supply rails and higher power; larger footprint and higher cost	Choose when designing ≥150 W amplifiers or needing extended SOA margin beyond KSC4010OTU's 120 V/6 A rating

Compared with MJD44H11T4 and 2SC5200, the KSC4010OTU offers optimal balance of 120 V rating, 6 A current, TO-3P mechanical stability, and proven audio linearity - making it ideal for mid-power discrete amplifiers where thermal mass and SOA predictability outweigh raw headroom.

Availability

KSC4010OTU is available at Aetrix Electronics and suitable for Hi-Fi audio amplifiers, professional PA systems, discrete bench power supplies, and industrial motor control pre-drivers requiring stable component supply with long-lifecycle support.

Supply support for KSC4010OTU 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 (acquired Fairchild Semiconductor in 2016) designs high-performance analog, power, and sensor solutions for automotive, industrial, and computing markets.

The KSC4010OTU belongs to Fairchild's legacy discrete power transistor family, engineered specifically for linear-mode audio and power supply applications demanding rugged SOA, consistent h_FE, and mechanical reliability in TO-3P packaging.

FAQ

What is the maximum continuous collector current rating for KSC4010OTU?

The KSC4010OTU has a maximum continuous collector current (I_C) rating of 6 A at case temperature T_C = 25°C. This rating decreases with rising case temperature per the published derating curve - at T_C = 100°C, the usable I_C drops to approximately 3.5 A. Operation above 6 A requires pulsed conditions (I_CP = 12 A) within SOA limits.

Is KSC4010OTU pin-compatible with KSA3010OTU?

No - KSC4010OTU (NPN) and KSA3010OTU (PNP) share identical TO-3P mechanical dimensions and pinout order (Base–Collector–Emitter), but their terminal polarities are reversed. When mounted on the same heatsink, their collectors are both connected to the case, requiring electrical isolation for complementary operation. The devices are complementary, not pin-swappable.

Does KSC4010OTU require a mica insulator when mounted to a heatsink?

Yes - because Pin 2 (Collector) is internally connected to the metal TO-3P case, KSC4010OTU requires electrical isolation (e.g., mica washer + thermal grease or silicone pad) when mounted to a grounded heatsink. Failure to insulate risks shorting the collector to system ground, potentially destroying the device and downstream circuitry.

What is the typical DC current gain (hFE) range for KSC4010OTU at I_C = 1 A?

The KSC4010OTU is binned into two h_FE groups: 'R' (55–110) and 'O' (80–160), both specified at V_CE = 5 V and I_C = 1 A. Typical h_FE falls near the center of each range - ~82 for R-grade and ~120 for O-grade. Designers should use min/max values for worst-case bias analysis, not typicals.

Can KSC4010OTU be used in switching power supplies?

KSC4010OTU is optimized for linear operation (e.g., audio amplifiers, analog regulators), not hard-switching SMPS. Its relatively high V_CE(sat) (≤2.5 V) and moderate f_T (30 MHz) make it inefficient for >50 kHz switching. For switch-mode use, consider faster, lower-V_CE(sat) alternatives like FJP13009 or MJE13009 - though SOA validation remains essential.

KSC4010OTU 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):: 6 A

Voltage - Collector Emitter Breakdown (Max):: 120 V

Vce Saturation (Max) @ Ib, Ic:: 2.5V @ 500mA, 5A

Current - Collector Cutoff (Max):: 10µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 80 @ 1A, 5V

Power - Max:: 60 W

Frequency - Transition:: 30MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-3PN

KSC4010OTU FAQ

1.How can I place an order for KSC4010OTU through Aetrix?

Please submit a Request for Quotation (RFQ) for KSC4010OTU 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 KSC4010OTU reliable?

The price and inventory of KSC4010OTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC4010OTU is usually 5 days.

3.What payment methods are accepted for KSC4010OTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC4010OTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSC4010OTU?

KSC4010OTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSC4010OTU 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 KSC4010OTU?

For technical support, including KSC4010OTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC4010OTU requirements.

6.How does Aetrix verify that KSC4010OTU is sourced from the original manufacturer or authorized distributors?

All KSC4010OTU 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 KSC4010OTU meets industry standards.

7.What is the process for return or replacement of KSC4010OTU?

All KSC4010OTU units undergo pre-shipment inspection (PSI). If there is an issue with KSC4010OTU, 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 KSC4010OTU part is unused and in its original packaging.

Return procedure for KSC4010OTU:

1.Submit a request within 90 days.

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

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