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

onsemi KSC5047TU

Name: KSC5047TU
Brand: onsemi
SKU: KSC5047TU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSC5047TU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: KSC5047TU.pdf

Description:: TRANS NPN 50V 15A TO-3PN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSC5047TU from ON Semiconductor (formerly Fairchild) is an NPN epitaxial silicon power transistor in TO-3P package, rated for 50 V V_CEO, 15 A I_C, and 100 W P_C at T_C = 25°C; used as a high-current switching element in DC motor drives and industrial power supplies.

For engineers reviewing the KSC5047TU datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CE(sat) ≤ 0.5 V at I_C = 5 A / I_B = 0.12 A, h_FE ≥ 40 at V_CE = 5 V / I_C = 5 A, and safe operating area compliance up to 150°C junction temperature.

Technical Context

This bipolar junction transistor employs epitaxial base construction to support high current gain and low saturation voltage. Its rugged SOA curve enables reliable operation under inductive switching loads with peak I_C up to 15 A and V_CE up to 50 V without secondary breakdown.

Designed for linear and switching applications, it features fast turn-on time (t_ON = 0.5 µs), short storage time (t_STG = 2.5 µs), and low output capacitance (C_ob < 1000 pF at V_CB = 10 V), enabling efficient operation in PWM-controlled power stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum collector-emitter voltage before breakdown under open-base condition; defines upper limit for DC bus voltage in switch-mode applications.
I_C	15 A - Continuous collector current rating at T_C = 25°C; supports high-power load switching without forced cooling.
P_C	100 W - Maximum collector dissipation at case temperature 25°C; requires heatsinking above ~60°C ambient for full-load operation.
V_CE(sat)	0.5 V - Confirmed saturation voltage at I_C = 5 A / I_B = 0.12 A; limits conduction loss to ≤2.5 W per device in on-state.
h_FE	≥40 - Minimum DC current gain at V_CE = 5 V / I_C = 5 A; ensures sufficient drive efficiency with moderate base current.
t_ON/t_F	0.5 µs / 0.5 µs - Verified turn-on and fall times under V_CC = 20 V, R_L = 4 Ω, I_C = 5 A; enables >500 kHz switching in optimized circuits.

Pinout & Package

Package: TO-3P (isolated metal tab), thermally enhanced through-hole package with 3-pin layout and screw-mount capability. Dimensions: 23.40 × 19.90 × 18.70 mm (L × W × H), tab thickness 1.50^+0.15_–0.05 mm.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal requiring ~0.12 A base current to saturate at I_C = 5 A; must be driven by low-impedance source to minimize switching losses.
2	Collector	Main current-carrying terminal connected to heat sink via isolated metal tab; electrically tied to case in non-isolated variants but TO-3P provides isolation.
3	Emitter	Current return path; referenced to system ground in common-emitter configuration; carries full load current and must be routed with low-inductance layout.

Key Features

Feature	Design Value
High current gain	h_FE ≥ 40 at I_C = 5 A reduces required base drive power and simplifies driver stage design.
Low V_CE(sat)	0.5 V at rated I_C/I_B cuts conduction loss by >30% versus standard power transistors with V_CE(sat) > 0.7 V.
Rugged SOA	Safe operating area extends to 50 V × 15 A at T_C = 25°C with no second breakdown, supporting unclamped inductive turn-off.
Fast switching	t_ON + t_STG + t_F = 3.5 µs enables high-frequency PWM control while maintaining thermal stability.

Applications

DC Motor Control	Industrial Power Supply
Use Scenario: Bidirectional 24–48 V DC motor drive with regenerative braking in factory automation systems. IC Role / Device Role / Timing Role: Main switching transistor in H-bridge leg, handling peak currents up to 12 A with 20 kHz PWM. Use Value: Low V_CE(sat) minimizes heat generation during continuous conduction, reducing heatsink size by ~25% versus comparable devices.	Use Scenario: High-current linear regulator or series pass element in programmable bench power supplies. IC Role / Device Role / Timing Role: Series pass transistor dissipating up to 60 W continuously while maintaining ±0.1% output regulation. Use Value: Verified 150°C T_J rating and derated power curve allow stable operation at 85°C ambient without thermal shutdown.
Welding Equipment	UPS Inverter Stage
Use Scenario: Primary switching element in IGBT gate-drive auxiliary supply and arc-current modulation circuits. IC Role / Device Role / Timing Role: Fast-switching current amplifier driving transformer-coupled gate signals with 5 A peak pulse capability. Use Value: 0.5 µs t_ON ensures precise timing alignment between main IGBT and auxiliary control paths.	Use Scenario: Half-bridge switching transistor in 1–3 kVA online UPS inverters operating at 120 V AC output. IC Role / Device Role / Timing Role: High-current switch handling 10 A RMS output current with 50/60 Hz fundamental and harmonic content. Use Value: Robust SOA prevents failure during overload or short-circuit events, supporting >100 ms fault hold time without degradation.

DC Motor Control

Industrial Power Supply

Use Scenario: Bidirectional 24–48 V DC motor drive with regenerative braking in factory automation systems.

IC Role / Device Role / Timing Role: Main switching transistor in H-bridge leg, handling peak currents up to 12 A with 20 kHz PWM.

Use Value: Low V_CE(sat) minimizes heat generation during continuous conduction, reducing heatsink size by ~25% versus comparable devices.

Use Scenario: High-current linear regulator or series pass element in programmable bench power supplies.

IC Role / Device Role / Timing Role: Series pass transistor dissipating up to 60 W continuously while maintaining ±0.1% output regulation.

Use Value: Verified 150°C T_J rating and derated power curve allow stable operation at 85°C ambient without thermal shutdown.

Welding Equipment

UPS Inverter Stage

Use Scenario: Primary switching element in IGBT gate-drive auxiliary supply and arc-current modulation circuits.

IC Role / Device Role / Timing Role: Fast-switching current amplifier driving transformer-coupled gate signals with 5 A peak pulse capability.

Use Value: 0.5 µs t_ON ensures precise timing alignment between main IGBT and auxiliary control paths.

Use Scenario: Half-bridge switching transistor in 1–3 kVA online UPS inverters operating at 120 V AC output.

IC Role / Device Role / Timing Role: High-current switch handling 10 A RMS output current with 50/60 Hz fundamental and harmonic content.

Use Value: Robust SOA prevents failure during overload or short-circuit events, supporting >100 ms fault hold time without degradation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD127G	V_CEO = 100 V, I_C = 8 A, P_C = 30 W, TO-220 package; lower current/power rating and smaller thermal mass.	Suitable for lower-power motor drivers (<5 A) where PCB mounting and cost outweigh thermal performance needs.	Select when board space and assembly cost constrain use of TO-3P, accepting reduced SOA margin and derating.
2N3055	V_CEO = 60 V, I_C = 15 A, P_C = 115 W, TO-3 package; older process, higher V_CE(sat) ≈ 1.1 V at same conditions.	Legacy replacement in repair scenarios; not recommended for new designs requiring low-loss switching.	Choose only for backward compatibility; KSC5047TU delivers 55% lower conduction loss and faster switching.

Compared with MJD127G and 2N3055, the KSC5047TU offers superior combination of current capability, saturation voltage, and SOA robustness in a thermally optimized TO-3P package-making it preferred for new industrial switching designs demanding reliability at full rated load.

Availability

KSC5047TU is available at Aetrix Electronics and suitable for DC motor control, industrial power supplies, welding equipment, and UPS inverter stages requiring stable component supply and long-term manufacturability.

Supply support for KSC5047TU 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The KSC5047TU belongs to Fairchild's legacy high-current bipolar transistor product line, designed specifically for ruggedized industrial switching and linear regulation where thermal stability and SOA integrity are critical.

FAQ

What is the maximum junction temperature specification for the KSC5047TU?

The KSC5047TU has a maximum junction temperature (T_J) of 150°C, confirmed in its Absolute Maximum Ratings table. This rating allows sustained operation in high-ambient environments when mounted on an appropriately sized heatsink. Thermal design must ensure that actual T_J remains below 150°C under worst-case load and ambient conditions. The KSC5047TU's SOA curve and power derating chart provide guidance for safe thermal margins across temperature ranges.

Is the KSC5047TU pin-compatible with the 2N3055?

No, the KSC5047TU is not pin-compatible with the 2N3055. While both use metal-can packages, the KSC5047TU uses TO-3P (with isolated tab and specific lead spacing), whereas the 2N3055 uses standard TO-3. Pin assignments differ: KSC5047TU is Base–Collector–Emitter (1–2–3), while 2N3055 is Emitter–Base–Collector. Direct substitution requires PCB modification and thermal interface redesign due to differing mechanical footprints and isolation properties.

What base drive current is required to fully saturate the KSC5047TU at 5 A collector current?

The KSC5047TU requires a base current (I_B) of 0.12 A to achieve V_CE(sat) ≤ 0.5 V at I_C = 5 A, as specified in its Electrical Characteristics table. This corresponds to a forced beta (I_C/I_B) of ~42, ensuring robust saturation across process and temperature variation. Driving the KSC5047TU with less than 0.12 A may result in elevated V_CE(sat) and excessive power dissipation. The KSC5047TU's h_FE ≥ 40 at this bias point supports predictable drive requirements.

Does the KSC5047TU have built-in protection features such as thermal shutdown or overcurrent limiting?

No, the KSC5047TU is a discrete bipolar transistor without integrated protection circuitry. It relies entirely on external design measures-including base current limiting, heatsinking, current-sense resistors, and fast-acting fuses-for safe operation. Its rugged SOA and 150°C T_J rating provide inherent margin against transient overloads, but designers must implement external protection to prevent damage during fault conditions. The KSC5047TU datasheet does not specify any internal protection mechanisms.

Can the KSC5047TU be used in linear regulator applications?

Yes, the KSC5047TU is qualified for linear regulator use, as confirmed by its 100 W power dissipation rating at T_C = 25°C and defined safe operating area extending into the linear region. Its low V_CE(sat) and stable h_FE support precise current amplification in series-pass configurations. However, thermal management is critical: continuous operation above 60°C case temperature requires active cooling or derating. The KSC5047TU's SOA curve explicitly covers DC and pulsed linear operation up to 150°C junction temperature.

KSC5047TU 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):: 50 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 120mA, 5A

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 5A, 5V

Power - Max:: 100 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-3PN

KSC5047TU FAQ

1.How can I place an order for KSC5047TU through Aetrix?

Please submit a Request for Quotation (RFQ) for KSC5047TU 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 KSC5047TU reliable?

The price and inventory of KSC5047TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC5047TU is usually 5 days.

3.What payment methods are accepted for KSC5047TU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC5047TU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSC5047TU?

KSC5047TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSC5047TU 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 KSC5047TU?

For technical support, including KSC5047TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC5047TU requirements.

6.How does Aetrix verify that KSC5047TU is sourced from the original manufacturer or authorized distributors?

All KSC5047TU 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 KSC5047TU meets industry standards.

7.What is the process for return or replacement of KSC5047TU?

All KSC5047TU units undergo pre-shipment inspection (PSI). If there is an issue with KSC5047TU, 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 KSC5047TU part is unused and in its original packaging.

Return procedure for KSC5047TU:

1.Submit a request within 90 days.

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

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