Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

onsemi KSD568OTU

Name: KSD568OTU
Brand: onsemi
SKU: KSD568OTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: KSD568OTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: KSD568OTU.pdf

Description:: TRANS NPN 60V 7A TO-220-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,360

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

KSD568OTU from ON Semiconductor (formerly Fairchild) is an NPN epitaxial silicon power transistor in TO-220 package, rated for 60 V V_CEO, 7 A DC collector current, and 40 W collector dissipation at T_C = 25°C, used in low-frequency power amplification and industrial switching circuits.

For engineers reviewing the KSD568OTU datasheet, pinout, applications, or equivalent options, key selection factors include its 0.5 V V_CE(sat) at I_C = 5 A / I_B = 0.5 A, h_FE range of 40–200 (R/O/Y classification), 15 A pulse current capability, and TO-220 thermal performance with case temperature derating.

Technical Context

The KSD568OTU operates as a medium-power, low-speed bipolar junction transistor optimized for linear amplification and hard-switching in industrial control systems. Its design emphasizes robust safe operating area (SOA) under pulsed conditions (PW ≤ 300 µs, duty cycle ≤ 10%) and stable DC gain (h_FE1 = 40–200 at V_CE = 1 V, I_C = 3 A).

It features complementary pairing with KSB707/KSB708 PNP devices, enabling push-pull amplifier stages. Junction temperature is rated to 150°C, and base-emitter saturation voltage is specified at 1.5 V under I_C = 5 A / I_B = 0.5 A, supporting predictable drive requirements in discrete power stage designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - Maximum continuous collector-emitter voltage before breakdown; defines upper rail limit in amplifier or switch applications.
I_C (DC)	7 A - Sustained collector current capability; determines steady-state power handling in Class-A/B amplifiers or relay drivers.
P_C (T_C=25°C)	40 W - Thermal power limit at case temperature 25°C; requires heatsink sizing per derating curve above 25°C.
V_CE(sat)	0.5 V @ I_C=5 A, I_B=0.5 A - Low saturation voltage minimizes conduction loss in switching mode operation.
h_FE (I_C=3 A)	40–200 - Wide DC current gain range across R/O/Y classifications; enables bias stability tuning in discrete amplifier designs.
T_J	150°C - Maximum junction temperature; sets thermal design margin for reliability under sustained load.

Pinout & Package

Package: TO-220 (3-lead, straight lead, insulated tab). Standard mounting via screw hole in tab; collector internally connected to tab.

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input terminal	Receives base current to enable conduction; requires driver capable of 3.5 A peak base current per spec.
2 (Collector)	High-current output node	Internally bonded to metal tab; must be electrically isolated from heatsink unless common-collector configuration is intended.
3 (Emitter)	Reference/return path	Serves as current return; low-impedance connection critical for minimizing V_BE error and thermal runaway risk.

Key Features

Feature	Design Value
Low V_CE(sat)	0.5 V ensures <1 W conduction loss at 5 A, improving efficiency in linear and switching regulators.
High I_CP	15 A pulse rating supports short-duration overload tolerance in motor start-up or solenoid drive circuits.
TO-220 thermal interface	40 W dissipation at T_C = 25°C enables use with standard extruded heatsinks in industrial enclosures.
Complementary pairing	Designed as NPN counterpart to KSB707/KSB708 PNP transistors for balanced push-pull audio and power amplifier outputs.

Applications

Audio Power Amplifier	Industrial Relay Driver
Use Scenario: Discrete Class-AB output stage in 20–50 W audio amplifiers for public address or instrumentation systems. IC Role / Device Role / Timing Role: NPN power output transistor delivering current gain and voltage swing to loudspeaker load. Use Value: 60 V V_CEO and 7 A I_C support ±25 V rails driving 4–8 Ω loads; low V_CE(sat) reduces crossover distortion and heat generation.	Use Scenario: Driving 24 VDC industrial relays or contactors requiring >5 A inductive load switching. IC Role / Device Role / Timing Role: High-current saturated switch controlling coil energization/de-energization. Use Value: 15 A pulse rating accommodates relay inrush current; TO-220 package allows direct heatsinking to DIN-rail mounted chassis.
Motor Start Circuit	DC Power Supply Regulator
Use Scenario: Soft-start or current-limited motor starter for small AC induction motors (≤1/2 HP) in HVAC or pump controls. IC Role / Device Role / Timing Role: Series pass element limiting inrush current during initial turn-on. Use Value: 40 W power dissipation and SOA curve allow controlled 100–500 ms current ramp without thermal runaway.	Use Scenario: Pass transistor in linear regulated DC power supplies delivering up to 5 A at 12–24 V output. IC Role / Device Role / Timing Role: Adjustable series regulator element dissipating excess input-output differential voltage. Use Value: h_FE ≥ 40 ensures stable feedback loop operation with minimal base drive; 150°C T_J rating supports ambient temperatures up to 70°C.

Audio Power Amplifier

Industrial Relay Driver

Use Scenario: Discrete Class-AB output stage in 20–50 W audio amplifiers for public address or instrumentation systems.

IC Role / Device Role / Timing Role: NPN power output transistor delivering current gain and voltage swing to loudspeaker load.

Use Value: 60 V V_CEO and 7 A I_C support ±25 V rails driving 4–8 Ω loads; low V_CE(sat) reduces crossover distortion and heat generation.

Use Scenario: Driving 24 VDC industrial relays or contactors requiring >5 A inductive load switching.

IC Role / Device Role / Timing Role: High-current saturated switch controlling coil energization/de-energization.

Use Value: 15 A pulse rating accommodates relay inrush current; TO-220 package allows direct heatsinking to DIN-rail mounted chassis.

Motor Start Circuit

DC Power Supply Regulator

Use Scenario: Soft-start or current-limited motor starter for small AC induction motors (≤1/2 HP) in HVAC or pump controls.

IC Role / Device Role / Timing Role: Series pass element limiting inrush current during initial turn-on.

Use Value: 40 W power dissipation and SOA curve allow controlled 100–500 ms current ramp without thermal runaway.

Use Scenario: Pass transistor in linear regulated DC power supplies delivering up to 5 A at 12–24 V output.

IC Role / Device Role / Timing Role: Adjustable series regulator element dissipating excess input-output differential voltage.

Use Value: h_FE ≥ 40 ensures stable feedback loop operation with minimal base drive; 150°C T_J rating supports ambient temperatures up to 70°C.

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 (T_A), TO-220F package with insulated tab	Higher voltage rating but lower power dissipation at ambient; better suited for higher-voltage, lower-thermal-margin designs	Select when V_CEO > 80 V is required and case-mounted heatsinking is not mandatory
TIP31C	V_CEO = 100 V, I_C = 3 A, P_C = 40 W (T_C), same TO-220 footprint but lower current rating	Limited to ≤3 A DC operation; unsuitable for 5–7 A continuous loads without parallel staging	Choose only for cost-sensitive, lower-current replacements where gain and SOA are less critical

Compared with MJD127G and TIP31C, the KSD568OTU offers superior DC current capacity (7 A vs. 3–8 A) and optimized SOA for industrial switching, while maintaining compatibility with standard TO-220 heatsink mounts and proven pairing with KSB707/708 in amplifier designs.

Availability

KSD568OTU is available at Aetrix Electronics and suitable for audio power amplifiers, industrial relay drivers, motor start circuits, and linear DC power supply regulators requiring stable component supply and long-term industrial availability.

Supply support for KSD568OTU 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 semiconductor supplier focused on energy-efficient electronics, with leadership in power management, analog, and discrete devices.

The KSD568OTU belongs to Fairchild's legacy low-frequency power transistor family, designed specifically for robust industrial amplification and switching where reliability, thermal stability, and complementary PNP pairing are essential.

FAQ

What is the maximum continuous collector current rating for KSD568OTU?

The KSD568OTU has a maximum DC collector current (I_C) rating of 7 A at T_C = 25°C. This rating assumes proper heatsinking and derating per the published power dissipation curve. At elevated case temperatures, allowable current decreases linearly-e.g., ~4.5 A at T_C = 75°C. The KSD568OTU also supports 15 A pulsed current (I_CP) under strict pulse-width and duty-cycle limits.

Is KSD568OTU pin-compatible with KSD569OTU?

No, KSD568OTU and KSD569OTU are not pin-compatible replacements. While both share identical TO-220 packaging and pinout (Base–Collector–Emitter), they differ in V_CEO rating: KSD568OTU is rated for 60 V, whereas KSD569OTU is rated for 80 V. Substituting one for the other requires verification of voltage stress margins in the target circuit; the KSD568OTU must not be used where V_CEO > 60 V is expected.

What is the typical h_FE range for KSD568OTU at I_C = 5 A?

At I_C = 5 A and V_CE = 1 V, the KSD568OTU exhibits h_FE2 ranging from 20 to 200, depending on the device's R/O/Y classification bin. The "R" grade offers 40–80, "O" offers 60–120, and "Y" offers 100–200. Designers should consult the specific reel label or datasheet marking to confirm the h_FE bin for a given KSD568OTU unit.

Does KSD568OTU require a heatsink in all applications?

Yes, the KSD568OTU requires a heatsink whenever power dissipation exceeds ~1.5 W at ambient temperature (P_C = 1.5 W at T_A = 25°C). Its 40 W rating applies only at T_C = 25°C-achievable only with substantial heatsinking. In practice, even moderate 3–5 A loads at 5–10 V drop demand a minimum 2°C/W heatsink to maintain safe junction temperature below 150°C.

What complementary PNP transistor pairs with KSD568OTU?

The KSD568OTU is explicitly designed as the NPN complement to the KSB707 and KSB708 PNP transistors. These devices share matched V_CEO, h_FE, and SOA characteristics, enabling symmetrical push-pull output stages in audio amplifiers and H-bridge drivers. The KSB707 matches KSD568OTU's 60 V rating, while KSB708 matches KSD569OTU's 80 V rating.

KSD568OTU 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):: 7 A

Voltage - Collector Emitter Breakdown (Max):: 60 V

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

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 60 @ 3A, 1V

Power - Max:: 1.5 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

KSD568OTU FAQ

1.How can I place an order for KSD568OTU through Aetrix?

Please submit a Request for Quotation (RFQ) for KSD568OTU 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 KSD568OTU reliable?

The price and inventory of KSD568OTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSD568OTU is usually 5 days.

3.What payment methods are accepted for KSD568OTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSD568OTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSD568OTU?

KSD568OTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSD568OTU 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 KSD568OTU?

For technical support, including KSD568OTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSD568OTU requirements.

6.How does Aetrix verify that KSD568OTU is sourced from the original manufacturer or authorized distributors?

All KSD568OTU 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 KSD568OTU meets industry standards.

7.What is the process for return or replacement of KSD568OTU?

All KSD568OTU units undergo pre-shipment inspection (PSI). If there is an issue with KSD568OTU, 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 KSD568OTU part is unused and in its original packaging.

Return procedure for KSD568OTU:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…