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

onsemi KSD569OTU

Name: KSD569OTU
Brand: onsemi
SKU: KSD569OTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSD569OTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: KSD569OTU.pdf

Description:: TRANS NPN 80V 7A TO-220-3

Quantity:: RFQ Add To RFQ list

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Inventory:8,826

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Product details

Overview

KSD569OTU from ON Semiconductor (formerly Fairchild) is an NPN epitaxial silicon power transistor designed for low-frequency power amplification and industrial low-speed switching. It features V_CEO = 80 V, I_C = 7 A (DC), P_C = 40 W at T_C = 25°C, V_CE(sat) = 0.5 V at I_C = 5 A / I_B = 0.5 A, and h_FE range of 100–200 (Y-class), commonly used in relay drivers and linear power supply pass elements.

For engineers reviewing the KSD569OTU datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-220 package thermal performance, DC current gain consistency at 5 A, saturation voltage under specified base drive, and safe operating area limitations for industrial switching duty cycles ≤10%.

Technical Context

The KSD569OTU operates as a medium-power NPN bipolar junction transistor with fixed three-terminal topology (Base–Collector–Emitter). Its design targets linear amplification and non-high-frequency switching, evidenced by h_FE characterization at V_CE = 1 V and pulse test conditions limited to PW ≤ 350 µs / duty cycle ≤ 2%.

Thermal derating is defined explicitly: collector dissipation drops from 40 W at T_C = 25°C to zero at T_C = 175°C, while ambient-rated dissipation is only 1.5 W - confirming mandatory heatsink use in all functional applications. Junction temperature is rated to 150°C, aligning with industrial-grade reliability requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - maximum continuous collector-emitter voltage before breakdown; defines upper rail limit in linear regulator or switch designs
I_C (DC)	7 A - steady-state collector current handling; determines minimum heatsink sizing for continuous conduction
P_C @ T_C=25°C	40 W - case-referenced power dissipation; requires mechanical mounting to thermally conductive surface
V_CE(sat)	0.5 V @ I_C=5 A, I_B=0.5 A - low saturation voltage reduces conduction loss in switching applications
h_FE (Y-class)	100–200 @ V_CE=1 V, I_C=5 A - high DC gain enables lower base drive current in amplifier or driver stages
T_J max	150°C - maximum allowable junction temperature; constrains thermal design margin under worst-case ambient + ΔT

Pinout & Package

Package: TO-220 (3-lead, straight lead form, insulated tab). Mounting requires electrically isolated heatsink interface due to collector-connected tab.

Pin/Terminal	Circuit Role	Design Meaning
1 (Left)	Base	Control terminal; requires ≥0.5 A DC base current to saturate at I_C = 5 A
2 (Center)	Collector	Main current path output; internally connected to metal tab - electrically active and thermally critical
3 (Right)	Emitter	Current return path; common reference for base drive and load connection

Key Features

Feature	Design Value
High h_FE Y-class binning	Guaranteed 100–200 DC current gain supports stable biasing without excessive base drive circuitry
Low V_CE(sat)	0.5 V saturation voltage minimizes power loss and self-heating during on-state operation
TO-220 power package	Standardized mechanical footprint with proven thermal interface capability for industrial PCB mounting
Complementary pairing	Designed as NPN counterpart to KSB707/KSB708 PNP transistors for push-pull amplifier stages

Applications

Linear Power Supply Regulator	Industrial Relay Driver
Use Scenario: Used as series pass transistor in adjustable linear voltage regulators delivering up to 5 A output current. IC Role / Device Role / Timing Role: NPN power transistor operating in active region to regulate output voltage via feedback-controlled base bias. Use Value: High h_FE and low V_CE(sat) reduce base drive burden and improve efficiency at full load.	Use Scenario: Drives 24 VDC industrial relays requiring ≥500 mA coil current in PLC output modules. IC Role / Device Role / Timing Role: Low-speed switching element turning relay coils on/off under microcontroller GPIO control. Use Value: 80 V V_CEO provides margin against inductive kickback; TO-220 package ensures reliable thermal management during repeated actuation.
Audio Power Amplifier Stage	Motor Speed Controller (DC)
Use Scenario: Output stage in Class AB audio amplifiers delivering 10–20 W into 4–8 Ω loads. IC Role / Device Role / Timing Role: Linear amplification device biased in active region to reproduce analog input waveform. Use Value: Stable h_FE across 3–5 A collector current range ensures consistent gain and low distortion.	Use Scenario: PWM-controlled current source for brushed DC motors in conveyor systems (≤1 HP). IC Role / Device Role / Timing Role: Switching element conducting motor current during PWM on-time; operated below 1 kHz. Use Value: 40 W case power rating supports intermittent 7 A motor surge currents without thermal runaway.

Linear Power Supply Regulator

Industrial Relay Driver

Use Scenario: Used as series pass transistor in adjustable linear voltage regulators delivering up to 5 A output current.

IC Role / Device Role / Timing Role: NPN power transistor operating in active region to regulate output voltage via feedback-controlled base bias.

Use Value: High h_FE and low V_CE(sat) reduce base drive burden and improve efficiency at full load.

Use Scenario: Drives 24 VDC industrial relays requiring ≥500 mA coil current in PLC output modules.

IC Role / Device Role / Timing Role: Low-speed switching element turning relay coils on/off under microcontroller GPIO control.

Use Value: 80 V V_CEO provides margin against inductive kickback; TO-220 package ensures reliable thermal management during repeated actuation.

Audio Power Amplifier Stage

Motor Speed Controller (DC)

Use Scenario: Output stage in Class AB audio amplifiers delivering 10–20 W into 4–8 Ω loads.

IC Role / Device Role / Timing Role: Linear amplification device biased in active region to reproduce analog input waveform.

Use Value: Stable h_FE across 3–5 A collector current range ensures consistent gain and low distortion.

Use Scenario: PWM-controlled current source for brushed DC motors in conveyor systems (≤1 HP).

IC Role / Device Role / Timing Role: Switching element conducting motor current during PWM on-time; operated below 1 kHz.

Use Value: 40 W case power rating supports intermittent 7 A motor surge currents without thermal runaway.

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 (min/max), TO-220F package with insulated tab	Higher voltage rating but lower guaranteed h_FE; better suited for higher-voltage flyback protection	Select when V_CEO margin >100 V is required and base drive can accommodate wider h_FE spread
BD249C	V_CEO = 80 V, I_C = 10 A, h_FE = 40–250, TO-126 package (lower power, no tab)	Higher current rating but smaller package; limited to ≤1.5 W at T_A, unsuitable for heatsink mounting	Choose only for low-duty-cycle, low-power signal-level amplification where TO-220 mechanical robustness is unnecessary

Compared with MJD127G and BD249C, the KSD569OTU offers optimal balance of 80 V rating, 7 A DC current, high Y-class h_FE, and TO-220 thermal capability - making it preferred for industrial linear and switching roles demanding predictable gain and heatsink-compatible packaging.

Availability

KSD569OTU is available at Aetrix Electronics and suitable for linear power supplies, industrial relay drivers, audio amplifier output stages, and DC motor controllers requiring stable component supply and long-lifecycle support.

Supply support for KSD569OTU 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 power management, analog, and sensor technologies.

The KSD569OTU belongs to Fairchild's legacy discrete power transistor family, engineered specifically for industrial linear amplification and low-speed switching where gain stability, saturation performance, and thermal reliability are prioritized over RF or high-frequency switching capability.

FAQ

What is the maximum continuous collector current rating for KSD569OTU?

The KSD569OTU has a maximum DC collector current rating of 7 A, specified at T_C = 25°C with adequate heatsinking. This rating assumes proper thermal management - exceeding 7 A continuously will cause junction overheating even with nominal case temperature, as power dissipation scales quadratically with current under saturation conditions.

Is KSD569OTU pin-compatible with KSD568OTU?

Yes, KSD569OTU and KSD568OTU share identical TO-220 package, pinout (Base–Collector–Emitter), and mechanical dimensions. The primary difference is V_CEO: 80 V for KSD569OTU versus 60 V for KSD568OTU. Substitution is permissible only if the application's maximum collector-emitter voltage remains below 60 V when using KSD568OTU.

Does KSD569OTU require a heatsink in normal operation?

Yes, KSD569OTU requires a heatsink for any application drawing >500 mA continuously. Its 40 W power dissipation rating applies only at T_C = 25°C - real-world PCB mounting raises case temperature significantly. Without forced-air or substantial heatsink thermal resistance ≤2.5°C/W, junction temperature will exceed 150°C under typical 3–5 A loads.

What hFE classification does KSD569OTU carry, and how is it marked?

KSD569OTU is manufactured in Y-class h_FE binning (100–200), indicated by a yellow color code band on the package body per Fairchild's standard marking system. This classification is verified per datasheet test condition: V_CE = 1 V, I_C = 5 A, and guarantees minimum gain of 100 for predictable bias design.

Can KSD569OTU be used in high-frequency switching applications like SMPS?

No, KSD569OTU is not suitable for high-frequency switching such as in switch-mode power supplies. Its datasheet specifies pulse testing only up to 350 µs with ≤2% duty cycle, and no transition frequency (f_T) or switching time parameters are provided. It is explicitly characterized for low-frequency power amplification and industrial low-speed switching - typically <1 kHz.

KSD569OTU 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):: 80 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

KSD569OTU FAQ

1.How can I place an order for KSD569OTU through Aetrix?

Please submit a Request for Quotation (RFQ) for KSD569OTU 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 KSD569OTU reliable?

The price and inventory of KSD569OTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSD569OTU is usually 5 days.

3.What payment methods are accepted for KSD569OTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSD569OTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSD569OTU?

KSD569OTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSD569OTU 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 KSD569OTU?

For technical support, including KSD569OTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSD569OTU requirements.

6.How does Aetrix verify that KSD569OTU is sourced from the original manufacturer or authorized distributors?

All KSD569OTU 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 KSD569OTU meets industry standards.

7.What is the process for return or replacement of KSD569OTU?

All KSD569OTU units undergo pre-shipment inspection (PSI). If there is an issue with KSD569OTU, 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 KSD569OTU part is unused and in its original packaging.

Return procedure for KSD569OTU:

1.Submit a request within 90 days.

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

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