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

onsemi KSC2333YTU

Name: KSC2333YTU
Brand: onsemi
SKU: KSC2333YTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSC2333YTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: KSC2333YTU.pdf

Description:: TRANS NPN 400V 2A TO-220-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSC2333YTU from ON Semiconductor is an NPN epitaxial silicon power transistor in TO-220 package, rated for 400 V V_CEO, 2 A DC collector current, and 15 W power dissipation at T_C = 25°C. It delivers low 1 V V_CE(sat) at I_C = 0.5 A / I_B = 0.1 A and supports high-speed switching in inductive load applications such as flyback converters and motor drivers.

For engineers reviewing the KSC2333YTU datasheet, pinout, applications, or equivalent options, key selection criteria include reverse-biased SOA validation under clamped inductive switching, h_FE classification (R/O/Y), V_CEX(sus) at 125°C, and thermal derating above 25°C case temperature.

Technical Context

The KSC2333YTU is optimized for high-voltage, medium-current switching with specified reverse-biased safe operating area (SOA) under clamped inductive conditions. Its design supports fast turn-on (1 µs), storage (2.5 µs), and fall (1 µs) times at V_CC = 150 V and R_L = 300 Ω, enabling reliable operation in hard-switched topologies.

It features dual sustaining voltage ratings: 400 V V_CEO(sus) at 25°C and 450 V V_CEX(sus)1 at 125°C with active base clamping (I_B1 = –I_B2 = 0.1 A), confirming robustness in thermally stressed inductive switching circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	400 V - Maximum continuous collector-emitter voltage before breakdown under open-base condition
I_C (DC)	2 A - Sustained collector current capability without pulse limitation
P_C @ T_C = 25°C	15 W - Thermal power limit at heatsink interface; derates linearly to zero at 150°C junction
V_CE(sat)	1 V @ I_C = 0.5 A, I_B = 0.1 A - Low saturation voltage reduces conduction loss in switching applications
h_FE (Min/Max)	20–80 - DC current gain range across R/O/Y classifications; enables predictable base drive sizing
t_ON/t_STG/t_F	1/2.5/1 µs - Verified switching timing under pulsed 150 V, 0.5 A, 300 Ω load conditions
V_CEX(sus)1	450 V @ T_C = 125°C, clamped - Sustaining voltage with active base clamping confirms ruggedness in hot, inductive turn-off

Pinout & Package

Package: TO-220 (JEDEC variation AB), 3-lead through-hole, isolated tab, intended for heatsink mounting. Pin 1 = Base, Pin 2 = Collector (tab-connected), Pin 3 = Emitter.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input terminal	Receives base current to saturate or cut off the transistor; requires external current-limiting resistor
2 (Collector)	High-voltage power output node	Electrically connected to metal tab; must be insulated from heatsink unless circuit ground reference permits
3 (Emitter)	Current return path	Serves as common reference for base drive and load return; low-inductance layout critical for switching stability

Key Features

Feature	Design Value
Reverse-biased SOA with inductive load	Validated clamped V_CEX(sus) up to 450 V at 125°C ensures reliability during inductive turn-off stress
Low V_CE(sat)	1 V at I_C/I_B = 5 enables <1 W conduction loss at 0.5 A, reducing thermal burden
Fast switching speed	1 µs t_ON and t_F support >500 kHz operation in non-resonant converters
h_FE classification	R/O/Y bins (20–80) allow precise base drive design per production lot without margin overdesign

Applications

Switch-Mode Power Supply (SMPS)	DC Motor Drive
Use Scenario: Used as main switch in 20–100 W flyback or forward converter primary side. IC Role / Device Role / Timing Role: High-voltage NPN switching transistor controlling energy transfer via transformer primary winding. Use Value: 400 V V_CEO and 450 V clamped V_CEX(sus) accommodate reflected output voltage spikes and leakage inductance ringing.	Use Scenario: Drives brushed DC motors up to 36 V supply in industrial actuators and HVAC dampers. IC Role / Device Role / Timing Role: Medium-power NPN switch in half-bridge or single-ended driver stage. Use Value: 2 A DC rating and 15 W dissipation support continuous 24 V/1.5 A motor loads with minimal heatsinking.
Inductive Load Switching	High-Voltage Relay Replacement
Use Scenario: Controls solenoids, contactors, and electromagnetic valves in PLC output modules. IC Role / Device Role / Timing Role: Inductive load switch with integrated reverse SOA protection against back-EMF. Use Value: Specified reverse-biased SOA allows direct connection to 400 V inductive loads without external snubbers in many cases.	Use Scenario: Replaces electromechanical relays in telecom line card power sequencing and battery backup systems. IC Role / Device Role / Timing Role: Solid-state high-voltage switch replacing relay contacts in 48 V–300 V DC control paths. Use Value: 400 V blocking capability and 1 µs switching enable fast, bounce-free, maintenance-free switching with no contact wear.

Switch-Mode Power Supply (SMPS)

DC Motor Drive

Use Scenario: Used as main switch in 20–100 W flyback or forward converter primary side.

IC Role / Device Role / Timing Role: High-voltage NPN switching transistor controlling energy transfer via transformer primary winding.

Use Value: 400 V V_CEO and 450 V clamped V_CEX(sus) accommodate reflected output voltage spikes and leakage inductance ringing.

Use Scenario: Drives brushed DC motors up to 36 V supply in industrial actuators and HVAC dampers.

IC Role / Device Role / Timing Role: Medium-power NPN switch in half-bridge or single-ended driver stage.

Use Value: 2 A DC rating and 15 W dissipation support continuous 24 V/1.5 A motor loads with minimal heatsinking.

Inductive Load Switching

High-Voltage Relay Replacement

Use Scenario: Controls solenoids, contactors, and electromagnetic valves in PLC output modules.

IC Role / Device Role / Timing Role: Inductive load switch with integrated reverse SOA protection against back-EMF.

Use Value: Specified reverse-biased SOA allows direct connection to 400 V inductive loads without external snubbers in many cases.

Use Scenario: Replaces electromechanical relays in telecom line card power sequencing and battery backup systems.

IC Role / Device Role / Timing Role: Solid-state high-voltage switch replacing relay contacts in 48 V–300 V DC control paths.

Use Value: 400 V blocking capability and 1 µs switching enable fast, bounce-free, maintenance-free switching with no contact wear.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
FJP5027	V_CEO = 400 V, I_C = 2 A, P_C = 25 W, TO-220, h_FE min 20 @ I_C = 0.5 A	Higher power dissipation allows higher ambient or lower heatsink performance; otherwise functionally aligned	Select FJP5027 when thermal headroom is constrained and 25 W rating enables reduced heatsink size
MJ11015	V_CEO = 120 V, I_C = 30 A, P_C = 200 W, TO-3, h_FE min 30 @ I_C = 10 A	Lower voltage rating but much higher current and power; incompatible for 400 V applications	Only consider MJ11015 in low-voltage, high-current designs where KSC2333YTU's voltage capability is excessive

Compared with FJP5027 and MJ11015, the KSC2333YTU offers optimal balance of 400 V blocking, 2 A current, and TO-220 thermal profile for cost-sensitive, medium-power inductive switching-neither over-specified nor under-rated for typical 24–48 V industrial control loads.

Availability

KSC2333YTU is available at Aetrix Electronics and suitable for switch-mode power supplies, DC motor drives, and industrial relay-replacement applications requiring stable component supply and long-term manufacturability.

Supply support for KSC2333YTU 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 (formerly Fairchild Semiconductor) is a global supplier of energy-efficient semiconductor components, specializing in power management, analog, sensor, and discrete devices for automotive, industrial, and consumer markets.

The KSC2333YTU belongs to ON Semiconductor's high-voltage bipolar transistor product line, designed specifically for rugged, high-speed switching in inductive-load environments such as SMPS, motor controls, and solid-state relays.

FAQ

What is the maximum junction temperature rating for the KSC2333YTU?

The KSC2333YTU has a maximum junction temperature (T_J) rating of 150°C. This value defines the upper thermal limit for reliable semiconductor operation. Exceeding 150°C risks permanent degradation of the die structure and parametric shift. The device's thermal resistance (R_θJC) and case temperature (T_C) must be monitored in system-level thermal design to ensure KSC2333YTU remains within this limit under worst-case load and ambient conditions.

Does the KSC2333YTU support base-emitter reverse voltage operation?

Yes, the KSC2333YTU specifies V_EBO = 5 V maximum emitter-base reverse voltage, verified at I_C = 0. The device is not designed for sustained reverse-biased base-emitter operation beyond this rating. In applications with potential negative base drive transients (e.g., inductive turn-off), external clamping diodes are recommended to protect the KSC2333YTU base-emitter junction from exceeding 5 V reverse bias.

How does the hFE classification (R/O/Y) affect KSC2333YTU design-in?

The KSC2333YTU is binned into R (h_FE = 20–40), O (30–60), or Y (40–80) groups. This classification directly determines required base drive current: for I_C = 0.5 A, R-bin needs ≥12.5 mA I_B, while Y-bin needs only ≥6.25 mA. Designers must select base resistors based on the purchased bin or specify bin tolerance in procurement to ensure consistent saturation across production lots of KSC2333YTU.

Can the KSC2333YTU replace the original Fairchild KSC2333 without changes?

Yes-the KSC2333YTU is the ON Semiconductor–branded successor to the Fairchild KSC2333, maintaining identical electrical specifications, TO-220 mechanical dimensions, pinout (1-Base, 2-Collector, 3-Emitter), and thermal characteristics. No PCB or schematic modifications are required when migrating from legacy KSC2333 to KSC2333YTU, as confirmed by ON Semiconductor's integration documentation and datasheet revision continuity.

What is the safe operating area (SOA) limitation for KSC2333YTU in inductive switching?

The KSC2333YTU specifies reverse-biased SOA under clamped inductive conditions: V_CEX(sus)1 = 450 V at T_C = 125°C with I_B1 = –I_B2 = 0.1 A and L = 180 µH. This validated SOA defines the maximum voltage-current boundary during turn-off with active base clamping. Operation outside this curve-especially at high V_CE and simultaneous I_C-risks second breakdown and irreversible failure of the KSC2333YTU.

KSC2333YTU 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):: 2 A

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

Vce Saturation (Max) @ Ib, Ic:: 1V @ 100mA, 500mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 100mA, 5V

Power - Max:: 15 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

KSC2333YTU FAQ

1.How can I place an order for KSC2333YTU through Aetrix?

Please submit a Request for Quotation (RFQ) for KSC2333YTU 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 KSC2333YTU reliable?

The price and inventory of KSC2333YTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC2333YTU is usually 5 days.

3.What payment methods are accepted for KSC2333YTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC2333YTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSC2333YTU?

KSC2333YTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSC2333YTU 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 KSC2333YTU?

For technical support, including KSC2333YTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC2333YTU requirements.

6.How does Aetrix verify that KSC2333YTU is sourced from the original manufacturer or authorized distributors?

All KSC2333YTU 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 KSC2333YTU meets industry standards.

7.What is the process for return or replacement of KSC2333YTU?

All KSC2333YTU units undergo pre-shipment inspection (PSI). If there is an issue with KSC2333YTU, 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 KSC2333YTU part is unused and in its original packaging.

Return procedure for KSC2333YTU:

1.Submit a request within 90 days.

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

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