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

onsemi KSC3074YTU

Name: KSC3074YTU
Brand: onsemi
SKU: KSC3074YTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSC3074YTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-251-3 Short Leads, IPAK, TO-251AA

Datasheet:: KSC3074YTU.pdf

Description:: TRANS NPN 50V 5A IPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSC3074YTU from ON Semiconductor (formerly Fairchild) is an NPN epitaxial silicon power transistor designed for high-power switching applications, with 50 V V_CEO, 5 A I_C, 20 W P_C at T_C=25°C, h_FE of 120–240 at I_C=3 A, and 0.5 V V_CE(sat) at I_C=3 A/I_B=0.15 A-used in DC-DC converter primary-side switches and motor drive half-bridge legs.

For engineers reviewing the KSC3074YTU datasheet, pinout, applications, or equivalent options, key selection considerations include safe operating area (SOA) compliance at 30 V/3 A pulse conditions, thermal derating above 25°C case temperature, I-Pak package mounting requirements, and complementary pairing with KSA1244 for push-pull topologies.

Technical Context

This device operates as a medium-voltage, medium-current NPN bipolar junction transistor optimized for linear and saturated switching modes. Its 120 MHz f_T, 80 pF C_ob, and sub-microsecond switching times (t_ON/t_F = 0.1 µs) support operation in 20–100 kHz hard-switched converters.

The KSC3074YTU features a single-die construction in I-Pak (TO-251AA) package with emitter-base and collector-base breakdown voltages rated at 5 V and 60 V respectively, enabling robust gate-drive margin in inductive load commutation where V_CE spikes exceed 40 V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum sustainable collector-emitter voltage under open-base condition; defines upper limit for flyback snubber design and bus voltage selection.
I_C	5 A - Continuous collector current rating at T_A=25°C; derates to zero at T_C≈125°C per published power derating curve.
V_CE(sat)	0.5 V @ I_C=3 A/I_B=0.15 A - Low saturation voltage enables <1.5 W conduction loss at 3 A, critical for thermal management in compact heatsinks.
h_FE	120–240 @ V_CE=1 V/I_C=3 A - High DC current gain reduces required base drive current, easing driver stage design and reducing gate resistor power dissipation.
f_T	120 MHz - Unity-gain bandwidth supports stable high-frequency amplification and fast switching edge control without excessive overshoot.
t_ON/t_F	0.1 µs each - Fast turn-on and fall times minimize switching transition losses in PWM-controlled power stages operating up to 100 kHz.

Pinout & Package

I-Pak (TO-251AA) package: isolated tab (collector), 3-pin surface-mount variant with gull-wing leads; requires solder pad thermal relief and mechanical anchoring per JEDEC MO-239.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Current-controlled input node	Receives base drive current to bias transistor into active/saturation; requires ≥0.15 A peak for full 3 A collector conduction.
2 (Collector)	Main power output terminal	Connected to heatsink via isolated metal tab; carries full load current and must be routed with low-inductance path to minimize V_CE spikes.
3 (Emitter)	Reference and return path	Serves as common reference for base drive and load return; layout must minimize trace inductance to prevent oscillation during switching transitions.

Key Features

Feature	Design Value
High SOA rating	Supports 30 V × 3 A pulsed operation (1 ms) without secondary breakdown-enables reliable use in inductive switching without snubber networks.
Low V_CE(sat)	0.5 V at rated 3 A ensures ≤1.5 W conduction loss, reducing thermal stress and permitting smaller heatsinks in space-constrained industrial controls.
Complementary pairing	Designed as NPN counterpart to KSA1244 PNP; matched h_FE range and SOA enable balanced push-pull amplifier and H-bridge output stages.
Robust thermal performance	20 W P_C at T_C=25°C with 150°C T_J(max) allows sustained operation at 85°C ambient when mounted on ≥25 cm² copper area.

Applications

DC-DC Converter Switch	Motor Drive Half-Bridge
Use Scenario: Primary-side switch in 24–48 V input, 100–500 W isolated forward or flyback converters. IC Role / Device Role / Timing Role: Power switching element controlling energy transfer through transformer primary winding during PWM on-time. Use Value: 50 V V_CEO and 0.5 V V_CE(sat) reduce conduction loss and improve efficiency over 88% at full load while maintaining SOA margin against reflected voltage spikes.	Use Scenario: Upper-leg switch in brushed DC motor H-bridge driving 24 V, 3 A loads in factory automation actuators. IC Role / Device Role / Timing Role: High-side NPN switch commutating current through motor winding; paired with KSA1244 lower-leg PNP. Use Value: Matched h_FE (120–240) and identical SOA ensure symmetrical turn-on/turn-off timing, minimizing shoot-through risk during dead-time transitions.
Inductive Load Driver	Linear Regulator Pass Element
Use Scenario: Solenoid and relay driver in PLC output modules handling 24 V, 2–4 A inductive loads. IC Role / Device Role / Timing Role: Saturated switch clamping inductive kickback via external freewheeling diode; handles repetitive 100 V transient spikes. Use Value: 60 V V_CBO and 1 µs storage time (t_STG) ensure reliable turn-off after coil de-energization without latch-up or secondary breakdown.	Use Scenario: Series pass transistor in adjustable 0–30 V, 3 A linear bench power supply. IC Role / Device Role / Timing Role: Continuously biased active-region amplifier dissipating up to 15 W under worst-case dropout (30 V in, 5 V out). Use Value: 20 W P_C at T_C=25°C and 150°C T_J(max) allow stable operation with forced-air cooling, avoiding thermal runaway during extended constant-current mode.

DC-DC Converter Switch

Motor Drive Half-Bridge

Use Scenario: Primary-side switch in 24–48 V input, 100–500 W isolated forward or flyback converters.

IC Role / Device Role / Timing Role: Power switching element controlling energy transfer through transformer primary winding during PWM on-time.

Use Value: 50 V V_CEO and 0.5 V V_CE(sat) reduce conduction loss and improve efficiency over 88% at full load while maintaining SOA margin against reflected voltage spikes.

Use Scenario: Upper-leg switch in brushed DC motor H-bridge driving 24 V, 3 A loads in factory automation actuators.

IC Role / Device Role / Timing Role: High-side NPN switch commutating current through motor winding; paired with KSA1244 lower-leg PNP.

Use Value: Matched h_FE (120–240) and identical SOA ensure symmetrical turn-on/turn-off timing, minimizing shoot-through risk during dead-time transitions.

Inductive Load Driver

Linear Regulator Pass Element

Use Scenario: Solenoid and relay driver in PLC output modules handling 24 V, 2–4 A inductive loads.

IC Role / Device Role / Timing Role: Saturated switch clamping inductive kickback via external freewheeling diode; handles repetitive 100 V transient spikes.

Use Value: 60 V V_CBO and 1 µs storage time (t_STG) ensure reliable turn-off after coil de-energization without latch-up or secondary breakdown.

Use Scenario: Series pass transistor in adjustable 0–30 V, 3 A linear bench power supply.

IC Role / Device Role / Timing Role: Continuously biased active-region amplifier dissipating up to 15 W under worst-case dropout (30 V in, 5 V out).

Use Value: 20 W P_C at T_C=25°C and 150°C T_J(max) allow stable operation with forced-air cooling, avoiding thermal runaway during extended constant-current mode.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD3053G	Lower V_CEO (30 V), higher h_FE (100–300), same I-Pak package	Not suitable for 48 V bus systems; better for 12–24 V automotive loads	Select only if operating voltage ≤30 V and higher DC gain is prioritized over voltage margin.
2SD1762	Higher V_CEO (60 V), same I_C (5 A), TO-220 package (not surface-mount)	Requires through-hole PCB assembly and larger heatsink footprint	Choose when legacy through-hole layout exists or when TO-220 mechanical robustness is required over I-Pak space savings.

Compared with MJD3053G and 2SD1762, the KSC3074YTU uniquely balances 50 V blocking, 5 A current, I-Pak surface-mount compatibility, and proven SOA in 24–48 V industrial switching-making it optimal for new SMT-based power stage designs requiring reliability at moderate voltage/current.

Availability

KSC3074YTU is available at Aetrix Electronics and suitable for DC-DC converters, motor drive half-bridges, and inductive load drivers requiring stable component supply across industrial control, factory automation, and embedded power system programs.

Supply support for KSC3074YTU 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 in 2016) is a global semiconductor supplier focused on energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.

The KSC3074YTU belongs to Fairchild's legacy high-reliability discrete power transistor family, engineered specifically for ruggedized industrial switching applications demanding wide SOA, consistent h_FE, and thermal stability under repetitive pulse loading.

FAQ

What is the maximum continuous collector current rating for KSC3074YTU at 75°C case temperature?

The KSC3074YTU has a maximum continuous collector current of 5 A at T_C=25°C, derating linearly to approximately 3.2 A at T_C=75°C per the published power derating curve (20 W → ~12.8 W). This reflects its 20 W P_C rating at 25°C and thermal resistance θ_JC ≈ 1.25°C/W, ensuring safe operation within SOA limits when heatsinked appropriately. Always verify actual board-level thermal performance with the KSC3074YTU in your layout.

Is KSC3074YTU pin-compatible with KSA1244 for complementary push-pull designs?

No-KSC3074YTU (NPN, I-Pak) and KSA1244 (PNP, I-Pak) share identical I-Pak package outlines and pinout order (1=Base, 2=Collector, 3=Emitter), but polarity reversal means their base/collector/emitter terminals serve opposite roles. Layouts must mirror routing for complementary biasing; direct substitution without circuit revision is not possible. The KSC3074YTU datasheet explicitly states "Complement to KSA1244" for functional pairing, not pin-for-pin replacement.

Does KSC3074YTU support operation in avalanche mode?

No-KSC3074YTU is not rated or characterized for repetitive avalanche operation. Its absolute maximum ratings specify V_CEO=50 V and V_CBO=60 V under defined test conditions, but the datasheet provides no avalanche energy (E_AS) rating, waveform data, or safe operating area curves for unclamped inductive switching. For circuits subject to significant V_CE overshoot, external clamping (e.g., TVS or RCD snubber) is mandatory when using the KSC3074YTU.

What is the typical base-emitter saturation voltage for KSC3074YTU at 3 A collector current?

The KSC3074YTU exhibits a typical V_BE(sat) of 0.9 V and maximum of 1.2 V at I_C=3 A and I_B=0.15 A, as specified in the Electrical Characteristics table. This value directly impacts base drive power dissipation and minimum required base resistor value in fixed-bias configurations. At 0.9 V typical, base drive loss remains below 135 mW, supporting efficient low-power driver IC interfacing with the KSC3074YTU.

Can KSC3074YTU be used in Class AB audio amplifier output stages?

Yes-the KSC3074YTU's 120 MHz f_T, low 0.5 V V_CE(sat), and linear h_FE behavior across 0.1–3 A make it suitable for medium-power Class AB emitter-follower or common-emitter output stages. However, its 50 V V_CEO limits rail voltage to ±24 V, and thermal design must accommodate 10–15 W quiescent dissipation. For high-fidelity applications, verify THD and frequency response empirically with the KSC3074YTU, as no audio-specific characterization is provided in the datasheet.

KSC3074YTU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-251-3 Short Leads, IPAK, TO-251AA

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 5 A

Voltage - Collector Emitter Breakdown (Max):: 50 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 150mA, 3A

Current - Collector Cutoff (Max):: 1µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 120 @ 1A, 1V

Power - Max:: 1 W

Frequency - Transition:: 120MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: IPAK

KSC3074YTU FAQ

1.How can I place an order for KSC3074YTU through Aetrix?

Please submit a Request for Quotation (RFQ) for KSC3074YTU 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 KSC3074YTU reliable?

The price and inventory of KSC3074YTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC3074YTU is usually 5 days.

3.What payment methods are accepted for KSC3074YTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC3074YTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSC3074YTU?

KSC3074YTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSC3074YTU 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 KSC3074YTU?

For technical support, including KSC3074YTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC3074YTU requirements.

6.How does Aetrix verify that KSC3074YTU is sourced from the original manufacturer or authorized distributors?

All KSC3074YTU 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 KSC3074YTU meets industry standards.

7.What is the process for return or replacement of KSC3074YTU?

All KSC3074YTU units undergo pre-shipment inspection (PSI). If there is an issue with KSC3074YTU, 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 KSC3074YTU part is unused and in its original packaging.

Return procedure for KSC3074YTU:

1.Submit a request within 90 days.

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

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