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

onsemi KSD568YTU

Name: KSD568YTU
Brand: onsemi
SKU: KSD568YTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSD568YTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: KSD568YTU.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSD568YTU 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 applications.

For engineers reviewing the KSD568YTU datasheet, pinout, applications, or equivalent options, key selection factors include V_CEO rating, h_FE classification (R-grade: 40–80), V_CE(sat) @ 5 A/0.5 A, thermal derating curve, and TO-220 mechanical mounting compatibility.

Technical Context

This device operates as a medium-power bipolar junction transistor optimized for linear amplification and slow-switching duty cycles (≤10% duty, ≤300 µs pulse width). Its design emphasizes robust safe operating area (SOA) under forward-biased conditions and stable DC current gain across 3–5 A collector current range.

It features complementary pairing with KSB707/KSB708 PNP transistors, supports base-driven operation with 3.5 A max base current, and requires heatsinking due to limited 1.5 W ambient-rated power dissipation - confirming its role in thermally managed industrial power stages.

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 designs.
I_C (DC)	7 A - Sustained collector current capability; determines output stage current handling without forced cooling.
P_C (T_C=25°C)	40 W - Maximum power dissipation with case held at 25°C; sets heatsink requirement baseline.
h_FE (R grade)	40–80 - DC current gain at V_CE = 1 V, I_C = 3 A; enables predictable base drive sizing for linear operation.
V_CE(sat)	0.5 V @ I_C = 5 A, I_B = 0.5 A - Low saturation voltage minimizes conduction loss in switching mode.
T_J max	150 °C - Maximum junction temperature; constrains thermal design margin and reliability lifetime.

Pinout & Package

Package: TO-220 (3-lead, straight lead, insulated tab). Mounting hole centered; tab electrically connected to collector. Standard 2.54 mm lead pitch, 15.9 mm body length.

Pin/Terminal	Circuit Role	Design Meaning
1 (Left)	Base	Current-controlled input terminal; requires 0.5 A base drive for full 5 A collector conduction.
2 (Center)	Collector	Main high-current output node; internally bonded to metal tab for thermal and electrical connection.
3 (Right)	Emitter	Reference terminal for bias network; carries full load current and anchors emitter degeneration resistors.

Key Features

Feature	Design Value
Complementary PNP pairing	Validated match with KSB707/KSB708 for push-pull amplifier stages and H-bridge drivers.
Forward-biased SOA	Defined safe operating area up to 50 V/10 A (300 µs pulse), enabling reliable overload tolerance.
Low V_BE(sat)	1.5 V @ I_C = 5 A, I_B = 0.5 A - reduces base drive power and improves efficiency in saturated switching.
TO-220 mechanical standardization	Compatible with industry-standard heatsinks and mounting hardware per JEDEC TO-220AB outline.

Applications

Audio Power Amplifier	Industrial Motor Driver
Use Scenario: 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 amplified current to speaker load with low crossover distortion. Use Value: 60 V V_CEO and 7 A I_C support ±25 V rails and 8 Ω loads; R-grade h_FE ensures consistent bias stability.	Use Scenario: Low-speed on/off control of solenoids, relays, or small DC motors in PLC I/O modules. IC Role / Device Role / Timing Role: Single-ended switch driving inductive loads with flyback protection and thermal margin. Use Value: 40 W P_C at T_C = 25°C and 150 °C T_J max allow sustained operation under intermittent duty cycles.
DC Power Supply Regulator	Welding Control Circuit
Use Scenario: Series pass element in linear regulated DC supplies delivering up to 5 A output current. IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output by dissipating excess input-output differential. Use Value: Low V_CE(sat) (0.5 V) and high h_FE reduce base drive burden and improve regulation accuracy.	Use Scenario: Gate/base driver interface stage controlling main IGBT or SCR in resistance welding timers. IC Role / Device Role / Timing Role: Current-amplifying buffer isolating logic-level timing signals from high-current gate drive paths. Use Value: 3.5 A I_B max and TO-220 thermal mass support repetitive 100 ms pulses with minimal thermal drift.

Audio Power Amplifier

Industrial Motor Driver

Use Scenario: 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 amplified current to speaker load with low crossover distortion.

Use Value: 60 V V_CEO and 7 A I_C support ±25 V rails and 8 Ω loads; R-grade h_FE ensures consistent bias stability.

Use Scenario: Low-speed on/off control of solenoids, relays, or small DC motors in PLC I/O modules.

IC Role / Device Role / Timing Role: Single-ended switch driving inductive loads with flyback protection and thermal margin.

Use Value: 40 W P_C at T_C = 25°C and 150 °C T_J max allow sustained operation under intermittent duty cycles.

DC Power Supply Regulator

Welding Control Circuit

Use Scenario: Series pass element in linear regulated DC supplies delivering up to 5 A output current.

IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output by dissipating excess input-output differential.

Use Value: Low V_CE(sat) (0.5 V) and high h_FE reduce base drive burden and improve regulation accuracy.

Use Scenario: Gate/base driver interface stage controlling main IGBT or SCR in resistance welding timers.

IC Role / Device Role / Timing Role: Current-amplifying buffer isolating logic-level timing signals from high-current gate drive paths.

Use Value: 3.5 A I_B max and TO-220 thermal mass support repetitive 100 ms pulses with minimal thermal drift.

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, h_FE = 30–120 (no R/O/Y grading), TO-263 package	Higher voltage rating and surface-mount form factor; lacks standardized h_FE binning	Preferred where board space is constrained and 100 V standoff is required; requires revalidation of base drive and thermal layout.
BD139	V_CEO = 80 V, I_C = 1.5 A, P_C = 12.5 W, TO-126 package	Lower power rating and smaller package; suitable only for sub-2 A loads	Acceptable for cost-sensitive, low-power replacements where thermal and current margins are relaxed.

Compared with KSD568YTU, MJD127G offers higher voltage headroom and SMT compatibility but no h_FE grading, while BD139 provides legacy availability at lower performance - neither is pin-compatible, requiring PCB redesign and thermal reassessment.

Availability

KSD568YTU is available at Aetrix Electronics and suitable for audio amplifiers, industrial motor drivers, linear power supplies, and welding control circuits requiring stable component supply and long-lifecycle support.

Supply support for KSD568YTU 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 KSD568YTU belongs to Fairchild's legacy low-frequency power transistor family, designed specifically for industrial amplification and switching where ruggedness, SOA integrity, and thermal stability outweigh high-speed requirements.

FAQ

What is the maximum collector-emitter voltage rating for KSD568YTU?

The KSD568YTU has a maximum collector-emitter voltage (V_CEO) rating of 60 V at T_C = 25°C. This rating defines the highest DC voltage that can be safely applied between collector and emitter with the base open. Exceeding this value risks avalanche breakdown and permanent device failure. The KSD568YTU datasheet confirms this parameter under Absolute Maximum Ratings, and it is strictly lower than the KSD569 variant's 80 V rating.

Does KSD568YTU have a specified h_FE range, and how is it binned?

Yes, KSD568YTU is binned into h_FE classifications: R-grade (40–80), O-grade (60–120), and Y-grade (100–200), measured at V_CE = 1 V and I_C = 3 A. The "YTU" suffix indicates R-grade h_FE, confirmed in Fairchild's KSD568/569 datasheet Rev. A. This binning allows precise base resistor selection in linear amplifier designs where gain consistency matters.

What is the collector dissipation limit of KSD568YTU at room temperature?

KSD568YTU has two collector dissipation ratings: 40 W when the case temperature (T_C) is maintained at 25°C using a heatsink, and only 1.5 W when operating at ambient temperature (T_A = 25°C) without heatsinking. This large difference underscores the necessity of mechanical thermal management - the device cannot sustain 7 A continuously without active heatsinking, as verified in the Absolute Maximum Ratings table.

Is KSD568YTU pin-compatible with KSB707 or KSB708?

No, KSD568YTU is not pin-compatible with KSB707 or KSB708. While they are complementary NPN/PNP pairs intended for matched operation in push-pull stages, their pinouts differ: KSD568YTU uses Base–Collector–Emitter (1–2–3), whereas KSB707/708 use Emitter–Collector–Base (1–2–3) in TO-220. Interchanging them without PCB revision will cause circuit malfunction or damage.

What package type does KSD568YTU use, and is the tab electrically isolated?

KSD568YTU uses the TO-220AB package with three leads in Base–Collector–Emitter order. The metal tab is electrically connected to the collector terminal - it is not insulated. Designers must ensure proper isolation (e.g., mica washer + shoulder washer) when mounting to grounded heatsinks to prevent short circuits. Mechanical dimensions match JEDEC standard TO-220 outlines, including 2.54 mm lead pitch and 15.9 mm body length.

KSD568YTU 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:: 100 @ 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

KSD568YTU FAQ

1.How can I place an order for KSD568YTU through Aetrix?

Please submit a Request for Quotation (RFQ) for KSD568YTU 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 KSD568YTU reliable?

The price and inventory of KSD568YTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSD568YTU is usually 5 days.

3.What payment methods are accepted for KSD568YTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSD568YTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSD568YTU?

KSD568YTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSD568YTU 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 KSD568YTU?

For technical support, including KSD568YTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSD568YTU requirements.

6.How does Aetrix verify that KSD568YTU is sourced from the original manufacturer or authorized distributors?

All KSD568YTU 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 KSD568YTU meets industry standards.

7.What is the process for return or replacement of KSD568YTU?

All KSD568YTU units undergo pre-shipment inspection (PSI). If there is an issue with KSD568YTU, 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 KSD568YTU part is unused and in its original packaging.

Return procedure for KSD568YTU:

1.Submit a request within 90 days.

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

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