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

onsemi KSD560RTSTU

Name: KSD560RTSTU
Brand: onsemi
SKU: KSD560RTSTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSD560RTSTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: KSD560RTSTU.pdf

Description:: TRANS NPN DARL 100V 5A TO-220-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSD560RTSTU from ON Semiconductor is an NPN epitaxial silicon Darlington transistor designed for low-speed switching and low-frequency power amplification in industrial applications. It features a 100 V V_CEO, 5 A DC collector current, 30 W collector dissipation at T_C = 25°C, and h_FE ranging from 2000 to 15000 depending on classification. It is commonly used in relay drivers and motor control circuits.

For engineers reviewing the KSD560RTSTU datasheet, pinout, applications, or equivalent options, key selection considerations include its TO-220 package thermal performance, Darlington saturation voltage (V_CE(sat) ≤ 1.5 V at I_C = 3 A), base drive requirements (I_B = 3 mA), and safe operating area limitations under pulsed conditions.

Technical Context

The KSD560RTSTU implements a monolithic Darlington pair structure with integrated emitter-base resistor network to enhance turn-off speed and reduce storage time. Its low h_FE variation across temperature and high DC current gain enable stable biasing in linear amplifier stages without active compensation.

It operates in Class-A or Class-AB configurations for audio and signal amplification, and supports pulse-width-controlled switching with t_ON = 1 µs and t_STG = 3.5 µs under specified test conditions (V_CC = 50 V, R_L = 16.7 Ω). The device is not rated for high-frequency RF or digital logic switching.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	100 V - Maximum continuous collector-emitter voltage before breakdown; defines upper rail limit in switching applications.
I_C (DC)	5 A - Sustained collector current capability; determines maximum load drive without derating at T_C = 25°C.
P_C (T_C = 25°C)	30 W - Thermal power dissipation limit at case temperature; requires heatsink for >1.5 W ambient operation.
h_FE (I_C = 3 A)	2000–15000 - High DC current gain enables low-base-drive-current operation; reduces driver stage complexity.
V_CE(sat)	≤1.5 V @ I_C = 3 A, I_B = 3 mA - Low saturation voltage minimizes conduction loss in switching mode.
t_ON/t_STG	1 µs / 3.5 µs - Turn-on and storage times define usable switching frequency ceiling (~100 kHz max).

Pinout & Package

Supplied in a through-hole TO-220 package with insulated tab, the KSD560RTSTU has three terminals: Base, Collector, and Emitter. The package provides mechanical robustness and thermal path to heatsink via the metal tab (Collector-connected).

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control input	Receives low-current drive signal; requires ≥3 mA for full saturation at I_C = 3 A.
2 (Collector)	High-current output node	Connected to internal heatsink tab; must be electrically isolated if mounting to shared chassis.
3 (Emitter)	Current return path	Common reference for load; polarity defines NPN Darlington configuration (emitter grounded in most designs).

Key Features

Feature	Design Value
Darlington architecture	Monolithic NPN pair delivers h_FE > 2000, reducing base drive burden versus single transistors.
TO-220 thermal design	30 W P_C rating at T_C = 25°C enables use in medium-power industrial loads without forced cooling.
Low V_CE(sat)	1.5 V max at rated I_C limits conduction loss to <1.5 W per device at 3 A, improving efficiency in linear/switching modes.
Complementary pairing	Designed as NPN complement to KSB601 PNP Darlington, enabling push-pull amplifier and H-bridge topologies.

Applications

Relay Driver Circuit	DC Motor Speed Control
Use Scenario: Driving 24 V/500 mA electromagnetic relays in PLC I/O modules. IC Role / Device Role / Timing Role: NPN Darlington switch providing galvanic isolation between microcontroller GPIO and relay coil. Use Value: High h_FE allows direct drive from 3.3 V MCU outputs with series resistor; V_CE(sat) < 1.5 V ensures full coil energization.	Use Scenario: PWM-controlled 12 V brushed DC motor in industrial automation actuators. IC Role / Device Role / Timing Role: Low-frequency power switch modulating motor current at ≤100 Hz. Use Value: 5 A I_C rating supports peak stall currents; TO-220 package accommodates heatsinking for intermittent duty cycles.
Linear Audio Amplifier Stage	Power Supply Pass Transistor
Use Scenario: Output stage in 5 W Class-AB audio amplifier for instrumentation feedback loops. IC Role / Device Role / Timing Role: Voltage-controlled current source delivering linear output into 8 Ω load. Use Value: Stable h_FE over temperature ensures predictable bias point; V_CEO = 100 V supports ±40 V rails.	Use Scenario: Series pass element in adjustable 0–30 V/3 A bench power supply. IC Role / Device Role / Timing Role: Regulated current sink controlled by error amplifier feedback loop. Use Value: 30 W P_C enables safe operation at 3 A × 5 V drop = 15 W dissipation with modest heatsink.

Relay Driver Circuit

DC Motor Speed Control

Use Scenario: Driving 24 V/500 mA electromagnetic relays in PLC I/O modules.

IC Role / Device Role / Timing Role: NPN Darlington switch providing galvanic isolation between microcontroller GPIO and relay coil.

Use Value: High h_FE allows direct drive from 3.3 V MCU outputs with series resistor; V_CE(sat) < 1.5 V ensures full coil energization.

Use Scenario: PWM-controlled 12 V brushed DC motor in industrial automation actuators.

IC Role / Device Role / Timing Role: Low-frequency power switch modulating motor current at ≤100 Hz.

Use Value: 5 A I_C rating supports peak stall currents; TO-220 package accommodates heatsinking for intermittent duty cycles.

Linear Audio Amplifier Stage

Power Supply Pass Transistor

Use Scenario: Output stage in 5 W Class-AB audio amplifier for instrumentation feedback loops.

IC Role / Device Role / Timing Role: Voltage-controlled current source delivering linear output into 8 Ω load.

Use Value: Stable h_FE over temperature ensures predictable bias point; V_CEO = 100 V supports ±40 V rails.

Use Scenario: Series pass element in adjustable 0–30 V/3 A bench power supply.

IC Role / Device Role / Timing Role: Regulated current sink controlled by error amplifier feedback loop.

Use Value: 30 W P_C enables safe operation at 3 A × 5 V drop = 15 W dissipation with modest heatsink.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BD679A	Lower V_CEO (80 V), higher V_CE(sat) (2.0 V), TO-126 package	Not suitable for 100 V bus applications; limited thermal capacity (1.25 W at T_A)	Select BD679A only for low-voltage, low-power relay drivers where PCB space is constrained.
MJD127	Higher I_C (8 A), same V_CEO (100 V), TO-220 package, no built-in base resistor	Requires external base resistor network for Darlington behavior; higher gain variability	Choose MJD127 when higher peak current or custom biasing is needed, but verify layout for added components.

Compared with BD679A and MJD127, the KSD560RTSTU offers superior thermal handling in TO-220, guaranteed h_FE classification, and optimized saturation characteristics for industrial switching-making it preferred for fixed-gain, medium-power applications requiring minimal external components.

Availability

KSD560RTSTU is available at Aetrix Electronics and suitable for relay driver circuits, DC motor control, linear audio amplifiers, and adjustable power supply designs requiring stable component supply and long-term industrial availability.

Supply support for KSD560RTSTU 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 energy-efficient power management, analog, sensor, and logic devices for automotive, industrial, and consumer markets.

The KSD560RTSTU belongs to ON Semiconductor's legacy Fairchild discrete transistor portfolio, engineered specifically for ruggedized industrial switching and linear amplification where reliability, thermal stability, and consistent gain are critical.

FAQ

What is the maximum continuous collector current for KSD560RTSTU?

The KSD560RTSTU supports a maximum DC collector current of 5 A at case temperature T_C = 25°C. Derating is required above this temperature per the power derating curve in the datasheet; at T_C = 100°C, the usable I_C drops to approximately 2.5 A. This rating assumes proper heatsinking and adherence to SOA limits during transient conditions.

Does KSD560RTSTU have a built-in base resistor?

No, the KSD560RTSTU does not integrate a base resistor. It is a standard two-terminal Darlington transistor (Base, Collector, Emitter) requiring external base current limiting. Unlike some modern Darlington arrays, its base terminal must be driven with a current-limited source-typically 3 mA minimum for full saturation at I_C = 3 A.

What is the pin configuration of KSD560RTSTU in TO-220 package?

The KSD560RTSTU uses standard TO-220 pinout: Pin 1 is Base, Pin 2 is Collector (connected to the metal tab), and Pin 3 is Emitter. When mounted with heatsink, electrical isolation between Collector and chassis is mandatory unless the system design intentionally references the tab to circuit ground or high-side potential.

Can KSD560RTSTU replace KSD560 in existing designs?

Yes, KSD560RTSTU is a direct replacement for KSD560. The "RTSTU" suffix reflects ON Semiconductor's post-Fairchild nomenclature update (replacing underscores with dashes); no electrical or mechanical changes were made. All specifications-including V_CEO, h_FE, and TO-220 footprint-remain identical to the original KSD560.

Is KSD560RTSTU suitable for high-frequency switching applications?

No, KSD560RTSTU is not intended for high-frequency switching. Its 3.5 µs storage time and 1.2 µs fall time limit practical operation to ≤100 kHz. It is optimized for low-speed industrial switching (e.g., relay control, lamp dimming) and linear amplification-not SMPS, RF, or digital logic interfaces.

KSD560RTSTU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN - Darlington

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

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

Vce Saturation (Max) @ Ib, Ic:: 1.5V @ 3mA, 3A

Current - Collector Cutoff (Max):: 1µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 2000 @ 3A, 2V

Power - Max:: 1.5 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

KSD560RTSTU FAQ

1.How can I place an order for KSD560RTSTU through Aetrix?

Please submit a Request for Quotation (RFQ) for KSD560RTSTU 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 KSD560RTSTU reliable?

The price and inventory of KSD560RTSTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSD560RTSTU is usually 5 days.

3.What payment methods are accepted for KSD560RTSTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSD560RTSTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSD560RTSTU?

KSD560RTSTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSD560RTSTU 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 KSD560RTSTU?

For technical support, including KSD560RTSTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSD560RTSTU requirements.

6.How does Aetrix verify that KSD560RTSTU is sourced from the original manufacturer or authorized distributors?

All KSD560RTSTU 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 KSD560RTSTU meets industry standards.

7.What is the process for return or replacement of KSD560RTSTU?

All KSD560RTSTU units undergo pre-shipment inspection (PSI). If there is an issue with KSD560RTSTU, 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 KSD560RTSTU part is unused and in its original packaging.

Return procedure for KSD560RTSTU:

1.Submit a request within 90 days.

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

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