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

onsemi KSC2334Y

Name: KSC2334Y
Brand: onsemi
SKU: KSC2334Y
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSC2334Y

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: KSC2334Y.pdf

Description:: TRANS NPN 100V 7A TO-220-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSC2334Y from ON Semiconductor is an NPN epitaxial silicon power transistor in TO-220 package, rated for 100 V V_CEO, 7 A DC collector current, and 40 W collector dissipation at T_C = 25°C. It delivers high-speed switching (t_ON/t_F = 0.5/1.5 µs) with low saturation voltages (V_CE(sat) = 0.6 V @ I_C = 5 A, I_B = 0.5 A), optimized for industrial motor control and SMPS primary-side switching.

For engineers reviewing the KSC2334Y datasheet, pinout, applications, or equivalent options, key selection criteria include its 100 V blocking capability, 15 A pulsed collector current, h_FE classification Y (120–240 at I_C = 3 A), safe operating area robustness, and TO-220 mechanical compatibility with heatsink mounting.

Technical Context

The KSC2334Y operates as a high-voltage, medium-current NPN bipolar junction transistor designed for hard-switched industrial power stages. Its sustaining voltage ratings (V_CEO(sus) = 100 V under inductive load conditions) and clamped switching performance confirm suitability for relay drivers and flyback converter switches where voltage transients exceed standard V_CEO.

Thermal design is constrained by case-limited dissipation (40 W @ T_C = 25°C) and rapid derating above 25°C - power drops to ~1.5 W at ambient temperature - requiring direct heatsink attachment. The device's h_FE classification Y ensures consistent DC gain across production lots for predictable base drive sizing.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	100 V - supports 80 V DC bus designs with 20% margin against transients
I_C (DC)	7 A - enables continuous 100 W output stage operation with adequate thermal margin
P_C @ T_C=25°C	40 W - requires TO-220 heatsink with ≤0.625°C/W thermal resistance for full rating
h_FE (I_C=3 A)	120–240 - allows stable base current design between 12.5 mA and 25 mA for 3 A load
t_F	1.5 µs - limits switching losses in 100 kHz–200 kHz SMPS topologies
V_CE(sat)	0.6 V @ I_C=5 A, I_B=0.5 A - contributes ≤3 W conduction loss at full load
T_J max	150°C - sets maximum allowable junction-to-case temperature rise at 125°C

Pinout & Package

Package: TO-220 (JEDEC variation AB, 3-lead, through-hole, heatsink-tabbed). Pin 1 = Base, Pin 2 = Collector (electrically connected to tab), Pin 3 = Emitter.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input	Receives base current to saturate or cut off transistor; requires current-limiting resistor in series
2 (Collector)	High-side power node	Electrically tied to metal tab; must be isolated from heatsink unless circuit ground reference permits
3 (Emitter)	Low-side return path	Serves as common emitter node; connects to ground or low-side switch node in totem-pole configurations

Key Features

Feature	Design Value
High V_CEO(sus) rating	100 V under inductive switching - enables reliable operation in unclamped inductive loads up to 1 mH
Classified h_FE (Y)	120–240 at I_C = 3 A - reduces base drive design uncertainty across manufacturing lots
Fast switching speed	t_ON/t_F = 0.5/1.5 µs - minimizes transition losses in hard-switched converters operating below 200 kHz
TO-220 mechanical standard	JEDEC TO-220AB footprint - supports drop-in replacement in legacy industrial PCBs with standardized heatsink holes
High pulse current capability	I_CP = 15 A (300 µs, 10% duty) - accommodates short-term surge currents in motor startup or fault limiting

Applications

Industrial Motor Drivers	SMPS Primary Switches
Use Scenario: Driving 24–48 V DC brushed motors in factory automation actuators with PWM control at 1–20 kHz. IC Role / Device Role / Timing Role: High-side NPN switch controlling motor current flow; base-driven with optocoupler-isolated signal. Use Value: 100 V V_CEO withstands back-EMF spikes during commutation; 7 A DC rating supports 50 W continuous motor output.	Use Scenario: Primary-side switch in offline 30–60 W flyback converters for industrial sensors and PLC I/O modules. IC Role / Device Role / Timing Role: Hard-switched BJT replacing MOSFET in cost-sensitive, lower-frequency (<100 kHz) AC/DC supplies. Use Value: Low V_CE(sat) (0.6 V) and fast t_F (1.5 µs) reduce total switching + conduction loss to <1.2 W at 5 A peak.
Relay & Solenoid Drivers	DC-DC Converter Switches
Use Scenario: Driving 12–24 V, 2–5 A electromagnetic relays and pneumatic solenoids in building control panels. IC Role / Device Role / Timing Role: Saturated switch providing low-impedance path between supply rail and coil return. Use Value: 40 W P_C and 15 A pulse rating absorb inductive kickback energy without snubber; TO-220 tab simplifies heatsinking.	Use Scenario: Step-down chopper switch in 12 V–5 V, 3 A non-isolated buck converters for embedded controller power rails. IC Role / Device Role / Timing Role: Medium-power BJT switch operating in continuous conduction mode with fixed-frequency PWM. Use Value: h_FE Y-class consistency ensures repeatable base drive design; 0.6 V V_CE(sat) limits dropout to <0.3 V at 3 A.

Industrial Motor Drivers

SMPS Primary Switches

Use Scenario: Driving 24–48 V DC brushed motors in factory automation actuators with PWM control at 1–20 kHz.

IC Role / Device Role / Timing Role: High-side NPN switch controlling motor current flow; base-driven with optocoupler-isolated signal.

Use Value: 100 V V_CEO withstands back-EMF spikes during commutation; 7 A DC rating supports 50 W continuous motor output.

Use Scenario: Primary-side switch in offline 30–60 W flyback converters for industrial sensors and PLC I/O modules.

IC Role / Device Role / Timing Role: Hard-switched BJT replacing MOSFET in cost-sensitive, lower-frequency (<100 kHz) AC/DC supplies.

Use Value: Low V_CE(sat) (0.6 V) and fast t_F (1.5 µs) reduce total switching + conduction loss to <1.2 W at 5 A peak.

Relay & Solenoid Drivers

DC-DC Converter Switches

Use Scenario: Driving 12–24 V, 2–5 A electromagnetic relays and pneumatic solenoids in building control panels.

IC Role / Device Role / Timing Role: Saturated switch providing low-impedance path between supply rail and coil return.

Use Value: 40 W P_C and 15 A pulse rating absorb inductive kickback energy without snubber; TO-220 tab simplifies heatsinking.

Use Scenario: Step-down chopper switch in 12 V–5 V, 3 A non-isolated buck converters for embedded controller power rails.

IC Role / Device Role / Timing Role: Medium-power BJT switch operating in continuous conduction mode with fixed-frequency PWM.

Use Value: h_FE Y-class consistency ensures repeatable base drive design; 0.6 V V_CE(sat) limits dropout to <0.3 V at 3 A.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD122G	V_CEO = 100 V, I_C = 8 A, h_FE = 30–120 (unclassified), TO-220 package	Lower h_FE range increases base drive sensitivity; higher I_C but same SOA envelope	Prefer when base drive current budget is flexible and gain spread is acceptable
BU508A	V_CEO = 1500 V, I_C = 8 A, slower t_F = 1.2 µs (typ), TO-220 package	Designed for horizontal deflection in CRT TVs; over-specified voltage, less optimized for fast industrial switching	Select only if 1500 V blocking is required; otherwise KSC2334Y offers better speed and SOA for 100 V apps

Compared with MJD122G and BU508A, the KSC2334Y provides tighter h_FE control (Y-class), faster fall time, and verified 100 V sustaining capability under inductive load - making it preferable for precision industrial switching where gain predictability and transient immunity are critical.

Availability

KSC2334Y is available at Aetrix Electronics and suitable for industrial motor drivers, SMPS primary-side switching, and relay/solenoid control requiring stable component supply and long-term manufacturability.

Supply support for KSC2334Y 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 manufacturer specializing in power management, analog, sensor, and discrete solutions for automotive, industrial, and cloud power applications.

The KSC2334Y belongs to ON Semiconductor's legacy high-voltage bipolar transistor product line, engineered for ruggedized industrial switching where reliability under repetitive inductive stress and thermal cycling is essential.

FAQ

What is the pin configuration of the KSC2334Y?

The KSC2334Y uses a standard TO-220 package with three leads: Pin 1 is Base, Pin 2 is Collector (connected to the metal tab), and Pin 3 is Emitter. This configuration is confirmed in the official ON Semiconductor datasheet Rev. A1 and aligns with JEDEC TO-220AB mechanical standard. Proper heatsink isolation is required since the collector tab is electrically active.

Does the KSC2334Y support inductive load switching?

Yes, the KSC2334Y is explicitly characterized for inductive switching: V_CEO(sus) = 100 V is tested with I_C = 5 A, I_B1 = 0.5 A, L = 1 mH, confirming robustness in relay, solenoid, and motor drive applications. Its safe operating area curve (Figure 4) validates operation under clamped inductive turn-off conditions.

What is the hFE classification for KSC2334Y and why does it matter?

The KSC2334Y carries the "Y" h_FE classification, meaning its DC current gain falls within 120–240 at V_CE = 5 V and I_C = 3 A. This tight binning reduces base drive design variability across production lots, enabling more precise and repeatable biasing in volume-manufactured industrial controls compared to unclassified transistors like MJD122G.

Can KSC2334Y replace KSA1010 in complementary circuits?

No - KSC2334Y is an NPN transistor, while KSA1010 is its complementary PNP counterpart. They are intended for use together in push-pull or totem-pole configurations. Substituting one for the other would invert logic polarity and violate bias requirements; the KSC2334Y datasheet explicitly states it is "complement to KSA1010", not a replacement.

What thermal derating applies to KSC2334Y at elevated case temperatures?

The KSC2334Y collector dissipation derates linearly from 40 W at T_C = 25°C to zero at T_C = 175°C, per Figure 6 in the datasheet. At T_C = 100°C, usable power drops to approximately 20 W. This requires careful heatsink selection and thermal interface design - especially since ambient-rated dissipation is only 1.5 W at T_A = 25°C.

KSC2334Y Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 7 A

Voltage - Collector Emitter Breakdown (Max):: 100 V

Vce Saturation (Max) @ Ib, Ic:: 600mV @ 500mA, 5A

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 120 @ 3A, 5V

Power - Max:: 1.5 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

KSC2334Y FAQ

1.How can I place an order for KSC2334Y through Aetrix?

Please submit a Request for Quotation (RFQ) for KSC2334Y 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 KSC2334Y reliable?

The price and inventory of KSC2334Y are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC2334Y is usually 5 days.

3.What payment methods are accepted for KSC2334Y?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC2334Y transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSC2334Y?

KSC2334Y orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSC2334Y 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 KSC2334Y?

For technical support, including KSC2334Y datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC2334Y requirements.

6.How does Aetrix verify that KSC2334Y is sourced from the original manufacturer or authorized distributors?

All KSC2334Y 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 KSC2334Y meets industry standards.

7.What is the process for return or replacement of KSC2334Y?

All KSC2334Y units undergo pre-shipment inspection (PSI). If there is an issue with KSC2334Y, 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 KSC2334Y part is unused and in its original packaging.

Return procedure for KSC2334Y:

1.Submit a request within 90 days.

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

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