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

onsemi KSC5338DTU

Name: KSC5338DTU
Brand: onsemi
SKU: KSC5338DTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSC5338DTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: KSC5338DTU.pdf

Description:: TRANS NPN 450V 5A TO-220-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSC5338DTU from onsemi is an NPN triple-diffused planar silicon power transistor in TO-220-3LD package, rated for 450 V V_CEO, 5 A DC collector current, and 75 W power dissipation at T_C = 25°C. It integrates a built-in free-wheeling diode and is engineered for high-voltage switching in electronic ballasts and inductive load drivers.

For engineers reviewing the KSC5338DTU datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.65°C/W junction-to-case thermal resistance, dynamic saturation voltage under 300 V inductive switching (as low as 1.9 V at 25°C), and storage time stability across temperature (1.4–2.2 µs at 25°C).

Technical Context

The KSC5338DTU employs a rugged triple-diffused planar structure optimized for high-voltage switching with wide safe operating area (SOA) up to 450 V and 5 A DC. Its integrated anti-parallel diode enables self-contained flyback energy handling in inductive circuits without external diodes.

Switching performance is characterized by tightly controlled storage time (t_STG = 1.4–2.2 µs at 25°C), fast fall time (t_F = 90–150 ns), and low dynamic saturation voltage (V_CE(DSAT) = 1.9–2.9 V at 300 V, 2 A, 3 s pulse), enabling efficient operation in electronic ballast and lamp driver topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	450 V - supports primary-side switching in 230 VAC-fed electronic ballasts and industrial SMPS
I_C (DC)	5 A - delivers sufficient current for 30–60 W fluorescent lamp drivers and medium-power inductive loads
P_C @ T_C=25°C	75 W - enables high-power density mounting on heatsinks with minimal derating below 100°C case temperature
R_jc	1.65 °C/W - allows direct thermal path to heatsink; 10°C rise per 6 W dissipated at junction
t_STG (25°C)	1.4–2.2 µs - ensures predictable turn-off timing critical for zero-voltage switching (ZVS) control in resonant ballasts
V_F (diode)	0.86–1.3 V @ 1 A - minimizes conduction loss during freewheeling phase in inductive switching cycles
f_T	11 MHz - supports stable linear gain in base-driven amplifier stages or gate-driver buffer applications

Pinout & Package

Package: TO-220-3LD (Case 340AT), through-hole, insulated tab, 3-terminal configuration with integral heatsink mounting surface.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input	Receives base drive current (up to 2 A DC); requires active turn-off (IB2) for fast storage-time control
2 (Collector)	High-voltage output node	Connected to switched inductive load or ballast tank circuit; rated for 450 V V_CEO and 1000 V V_CBO
3 (Emitter)	Power return / reference	Serves as common emitter node; internal diode cathode connects to collector, anode to emitter

Key Features

Feature	Design Value
Built-in free-wheeling diode	Reduces BOM count and PCB footprint; eliminates need for external flyback diode in lamp driver designs
Wide SOA (Safe Operating Area)	Supports simultaneous 300 V and 2 A operation under inductive switching without secondary breakdown
Small variance in storage time	Enables consistent switching timing across temperature (±0.4 µs variation from −25°C to +125°C)
Pb-free and halide-free construction	Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level (MSL) requirements
Low dynamic saturation voltage	V_CE(DSAT) = 1.9 V @ 300 V, 2 A, 3 s pulse - reduces switching losses in high-duty-cycle ballast operation

Applications

Fluorescent Lamp Electronic Ballast	Inductive Load Switching Driver
Use Scenario: Driving resonant LC tank in 20–60 W instant-start fluorescent lamp systems operating from 220–240 VAC mains. IC Role / Device Role / Timing Role: Main high-voltage switch controlling lamp current via half-bridge topology; handles flyback energy via integrated diode. Use Value: Eliminates external flyback diode and simplifies gate-drive timing due to predictable t_STG (1.4–2.2 µs), reducing component count and improving reliability.	Use Scenario: Controlling solenoid valves, relay coils, or transformer primaries in industrial automation equipment with 15–300 V DC supply rails. IC Role / Device Role / Timing Role: High-voltage NPN switch with active turn-off capability; used with complementary base drive (IB1/IB2) to manage inductive kickback. Use Value: Integrated diode and low V_F (0.86–1.3 V) reduce peak reverse voltage stress on the transistor and improve system efficiency by >5% vs. discrete diode solutions.
AC Motor Starter Circuit	High-Voltage DC Power Switch
Use Scenario: Soft-start and run control of single-phase AC induction motors (e.g., HVAC blowers, pump drives) using phase-angle or burst-fire triggering. IC Role / Device Role / Timing Role: Line-commutated switch in series with motor winding; conducts during positive half-cycles and blocks during negative half-cycles. Use Value: 450 V V_CEO rating provides 2× safety margin over 230 VAC peak (325 V), ensuring robust blocking during transients and line surges.	Use Scenario: Primary-side switching in offline DC-DC converters for telecom or industrial power supplies requiring 300–450 V DC input. IC Role / Device Role / Timing Role: High-voltage NPN switch in forward or flyback topology; operates with base drive isolation and snubber network. Use Value: Wide SOA and R_jc = 1.65 °C/W allow continuous 5 A conduction at 75 W with standard TO-220 heatsinking-no forced air required below 60°C ambient.

Fluorescent Lamp Electronic Ballast

Inductive Load Switching Driver

Use Scenario: Driving resonant LC tank in 20–60 W instant-start fluorescent lamp systems operating from 220–240 VAC mains.

IC Role / Device Role / Timing Role: Main high-voltage switch controlling lamp current via half-bridge topology; handles flyback energy via integrated diode.

Use Value: Eliminates external flyback diode and simplifies gate-drive timing due to predictable t_STG (1.4–2.2 µs), reducing component count and improving reliability.

Use Scenario: Controlling solenoid valves, relay coils, or transformer primaries in industrial automation equipment with 15–300 V DC supply rails.

IC Role / Device Role / Timing Role: High-voltage NPN switch with active turn-off capability; used with complementary base drive (IB1/IB2) to manage inductive kickback.

Use Value: Integrated diode and low V_F (0.86–1.3 V) reduce peak reverse voltage stress on the transistor and improve system efficiency by >5% vs. discrete diode solutions.

AC Motor Starter Circuit

High-Voltage DC Power Switch

Use Scenario: Soft-start and run control of single-phase AC induction motors (e.g., HVAC blowers, pump drives) using phase-angle or burst-fire triggering.

IC Role / Device Role / Timing Role: Line-commutated switch in series with motor winding; conducts during positive half-cycles and blocks during negative half-cycles.

Use Value: 450 V V_CEO rating provides 2× safety margin over 230 VAC peak (325 V), ensuring robust blocking during transients and line surges.

Use Scenario: Primary-side switching in offline DC-DC converters for telecom or industrial power supplies requiring 300–450 V DC input.

IC Role / Device Role / Timing Role: High-voltage NPN switch in forward or flyback topology; operates with base drive isolation and snubber network.

Use Value: Wide SOA and R_jc = 1.65 °C/W allow continuous 5 A conduction at 75 W with standard TO-220 heatsinking-no forced air required below 60°C ambient.

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
ST13007D	V_CEO = 400 V, I_C = 8 A, no integrated diode, R_jc = 1.5°C/W	Requires external flyback diode; higher current but lower voltage rating limits use in 230 VAC ballasts with surge margin	Select when higher DC current (>5 A) is needed and external diode integration is acceptable
MJE13009	V_CEO = 400 V, I_C = 12 A, no integrated diode, f_T = 4 MHz	Lacks built-in diode and has lower f_T; wider SOA but less precise storage time control	Prefer for general-purpose high-current switching where diode integration is not required and timing precision is secondary

Compared with ST13007D and MJE13009, the KSC5338DTU offers unique value in electronic ballast design through its monolithic diode integration, tighter storage time tolerance (±0.4 µs), and guaranteed 450 V blocking-enabling simpler, more reliable, and smaller-form-factor lamp driver implementations.

Availability

KSC5338DTU is available at Aetrix Electronics and suitable for fluorescent lamp ballasts, inductive load drivers, AC motor starters, and high-voltage DC power switches requiring stable component supply and long-term industrial availability.

Supply support for KSC5338DTU 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The KSC5338DTU belongs to onsemi's high-voltage bipolar power transistor product line, designed specifically for robust, thermally efficient switching in lighting, motor control, and industrial power conversion systems.

FAQ

What is the maximum collector-emitter voltage rating for the KSC5338DTU?

The KSC5338DTU has a maximum collector-emitter voltage (V_CEO) rating of 450 V at T_A = 25°C. This rating ensures reliable blocking capability in 230 VAC-derived systems with adequate surge margin. The device also supports 1000 V collector-base voltage (V_CBO), confirming its suitability for high-voltage transient environments typical in electronic ballasts and industrial controls.

Does the KSC5338DTU include an integrated diode, and how is it configured?

Yes, the KSC5338DTU includes a built-in free-wheeling diode monolithically integrated between collector and emitter. The diode anode connects to the emitter terminal and the cathode to the collector terminal-confirmed by the equivalent circuit diagram and VF test conditions in the datasheet. This configuration enables automatic energy recirculation during inductive turn-off without external components.

What is the thermal resistance from junction to case (R_jc) for the KSC5338DTU, and why does it matter?

The KSC5338DTU has a junction-to-case thermal resistance (R_jc) of 1.65°C/W. This low value indicates highly efficient heat transfer from the silicon die to the TO-220 metal tab, allowing effective thermal management with standard heatsinks. For example, dissipating 30 W results in only a 49.5°C temperature rise from junction to case-critical for maintaining long-term reliability in sealed or high-ambient environments.

How does the KSC5338DTU perform in inductive load switching applications?

The KSC5338DTU is specifically characterized for inductive load switching, with published data for t_STG (1.9–2.2 µs), t_F (120–200 ns), and t_C (300–750 ns) under V_Z = 300–350 V and L_C = 200–300 µH. Its low dynamic saturation voltage (as low as 1.9 V at 300 V, 2 A, 3 s) and integrated diode make it ideal for lamp drivers and solenoid controllers where energy recovery and timing predictability are essential.

Is the KSC5338DTU RoHS-compliant and halogen-free?

Yes, the KSC5338DTU is explicitly marked as Pb-free and halide-free in the datasheet's Features section and Ordering Information table. It complies with the EU RoHS Directive 2011/65/EU and meets JEDEC J-STD-020 moisture sensitivity requirements, making it suitable for environmentally regulated industrial and consumer lighting applications without restriction.

KSC5338DTU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

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

Voltage - Collector Emitter Breakdown (Max):: 450 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 200mA, 1A

Current - Collector Cutoff (Max):: 100µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 6 @ 2A, 1V

Power - Max:: 75 W

Frequency - Transition:: 11MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

KSC5338DTU FAQ

1.How can I place an order for KSC5338DTU through Aetrix?

Please submit a Request for Quotation (RFQ) for KSC5338DTU 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 KSC5338DTU reliable?

The price and inventory of KSC5338DTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC5338DTU is usually 5 days.

3.What payment methods are accepted for KSC5338DTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC5338DTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSC5338DTU?

KSC5338DTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSC5338DTU 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 KSC5338DTU?

For technical support, including KSC5338DTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC5338DTU requirements.

6.How does Aetrix verify that KSC5338DTU is sourced from the original manufacturer or authorized distributors?

All KSC5338DTU 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 KSC5338DTU meets industry standards.

7.What is the process for return or replacement of KSC5338DTU?

All KSC5338DTU units undergo pre-shipment inspection (PSI). If there is an issue with KSC5338DTU, 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 KSC5338DTU part is unused and in its original packaging.

Return procedure for KSC5338DTU:

1.Submit a request within 90 days.

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

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