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

onsemi KSD2058YTSTU

Name: KSD2058YTSTU
Brand: onsemi
SKU: KSD2058YTSTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSD2058YTSTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3 Full Pack

Datasheet:: KSD2058YTSTU.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSD2058YTSTU from ON Semiconductor (formerly Fairchild) is an NPN epitaxial silicon power transistor in TO-220F package, rated for 60 V V_CEO, 3 A I_C, and 25 W P_C at T_C = 25°C, with h_FE 100–200 (Y-class), used in low-frequency power amplifier and switching applications such as relay drivers and motor control stages.

For engineers reviewing the KSD2058YTSTU datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CE(sat) ≤ 1.5 V at I_C = 2 A / I_B = 0.2 A, safe operating area compliance up to 100 mS pulse width, and thermal derating behavior under finite heat sink conditions.

Technical Context

This device operates as a medium-power, low-frequency bipolar junction transistor optimized for linear amplification and saturated switching. Its design emphasizes robust DC current gain (h_FE = 100–200 at V_CE = 5 V, I_C = 0.5 A) and low saturation voltage (V_CE(sat) = 1.5 V max), supported by a maximum junction temperature of 150°C and storage range from –55°C to +150°C.

The KSD2058YTSTU features a TO-220F package with insulated tab, enabling direct mounting to heatsinks without electrical isolation hardware. Its f_T of 0.4 MHz confirms suitability for audio and industrial control frequencies-not RF or high-speed digital switching.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - Maximum collector-emitter voltage before breakdown under open-base condition; defines safe DC rail limit in amplifier or switch designs.
I_C	3 A - Continuous collector current rating; usable up to 3 A with adequate heatsinking per derating curve.
P_C (T_C = 25°C)	25 W - Maximum power dissipation at case temperature 25°C; requires thermal interface and heatsink for sustained operation.
h_FE (Y-class)	100–200 - Confirmed DC current gain range at V_CE = 5 V, I_C = 0.5 A; enables predictable base drive sizing in linear or saturated operation.
V_CE(sat)	1.5 V max at I_C = 2 A, I_B = 0.2 A - Low saturation voltage reduces conduction loss in switching applications like solenoid or lamp drivers.
t_ON/t_F	0.65 µs each - Verified turn-on and fall times under defined resistive load (R_L = 15 Ω, V_CC = 30 V); supports ~1.5 MHz square-wave operation in non-critical timing circuits.

Pinout & Package

Package: TO-220F (insulated flange), 3-lead, vertical mounting with metal tab electrically isolated from collector. Dimensions comply with JEDEC TO-220 standard; flange thickness 1.47 mm max, lead pitch 2.54 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 (Left)	Base	Current-controlled input terminal; requires ≥0.2 A base drive for full saturation at 2 A collector load.
2 (Center)	Collector	Main current path output; connected to heatsink via insulated tab; electrically isolated from mounting surface.
3 (Right)	Emitter	Reference node for base-emitter bias and collector current return; typically grounded or tied to low-side switch node.

Key Features

Feature	Design Value
Y-class h_FE binning	Guaranteed 100–200 h_FE at test conditions-enables consistent gain matching across production units in multi-stage amplifiers.
TO-220F insulated package	Electrically isolated metal tab allows direct heatsink mounting without mica washers or insulating pads-reducing thermal resistance and assembly cost.
Low V_CE(sat)	≤1.5 V at I_C = 2 A ensures <3 W conduction loss in saturated switching-critical for thermally constrained relay or fan driver PCBs.
SOA compliance	Validated safe operating area up to 100 ms pulse width at 60 V/3 A-supports inductive load switching with snubber-free design in many industrial controls.

Applications

Audio Power Amplifier Stage	DC Motor Driver (Low-Speed)
Use Scenario: Single-ended Class-A or Class-AB output stage in 10–20 W audio amplifiers driving 4–8 Ω speakers. IC Role / Device Role / Timing Role: NPN power transistor delivering linear current amplification with minimal crossover distortion due to stable h_FE and low V_BE(on). Use Value: Delivers clean mid-band output with <1.5 V saturation headroom and thermal stability up to 150°C junction temperature.	Use Scenario: H-bridge half-bridge leg or single-direction driver for brushed DC motors in HVAC actuators or conveyor systems (≤30 V, ≤2 A). IC Role / Device Role / Timing Role: Saturated switch controlling motor current flow; driven by microcontroller GPIO or dedicated gate driver. Use Value: Enables efficient on/off control with 0.65 µs switching transitions and SOA-rated pulse handling for stall-current surges.
Relay/Solenoid Driver	Linear Voltage Regulator Pass Element
Use Scenario: High-current coil driver for industrial 24 VDC relays or pneumatic solenoids requiring ≥2 A peak hold current. IC Role / Device Role / Timing Role: Low-side switch sinking relay coil current; base driven via current-limiting resistor from logic-level signal. Use Value: Provides reliable turn-on with 100–200 h_FE margin and 60 V V_CEO headroom against inductive kickback.	Use Scenario: Series pass element in adjustable linear regulators supplying 5–12 V at up to 2.5 A for analog sensor subsystems. IC Role / Device Role / Timing Role: Continuously biased BJT regulating output voltage via emitter-follower configuration with external feedback network. Use Value: Maintains regulation under load transients thanks to 25 W T_C-based dissipation capability and 150°C TJ max.

Audio Power Amplifier Stage

DC Motor Driver (Low-Speed)

Use Scenario: Single-ended Class-A or Class-AB output stage in 10–20 W audio amplifiers driving 4–8 Ω speakers.

IC Role / Device Role / Timing Role: NPN power transistor delivering linear current amplification with minimal crossover distortion due to stable h_FE and low V_BE(on).

Use Value: Delivers clean mid-band output with <1.5 V saturation headroom and thermal stability up to 150°C junction temperature.

Use Scenario: H-bridge half-bridge leg or single-direction driver for brushed DC motors in HVAC actuators or conveyor systems (≤30 V, ≤2 A).

IC Role / Device Role / Timing Role: Saturated switch controlling motor current flow; driven by microcontroller GPIO or dedicated gate driver.

Use Value: Enables efficient on/off control with 0.65 µs switching transitions and SOA-rated pulse handling for stall-current surges.

Relay/Solenoid Driver

Linear Voltage Regulator Pass Element

Use Scenario: High-current coil driver for industrial 24 VDC relays or pneumatic solenoids requiring ≥2 A peak hold current.

IC Role / Device Role / Timing Role: Low-side switch sinking relay coil current; base driven via current-limiting resistor from logic-level signal.

Use Value: Provides reliable turn-on with 100–200 h_FE margin and 60 V V_CEO headroom against inductive kickback.

Use Scenario: Series pass element in adjustable linear regulators supplying 5–12 V at up to 2.5 A for analog sensor subsystems.

IC Role / Device Role / Timing Role: Continuously biased BJT regulating output voltage via emitter-follower configuration with external feedback network.

Use Value: Maintains regulation under load transients thanks to 25 W T_C-based dissipation capability and 150°C TJ max.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD2058G	Same die, TO-263 (D²PAK) package; higher R_θJC (1.5°C/W vs. 0.9°C/W), no insulated tab.	Requires PCB copper pour or external insulator for heatsink mounting; less suitable for chassis-mounted metal heatsinks.	Select when surface-mount assembly is required and thermal interface can be managed via large copper area.
BD241C	Lower h_FE (25–250, wide spread), higher V_CE(sat) (1.8 V typ), same TO-220 package but non-insulated tab.	Needs higher base drive; requires isolation hardware for heatsink mounting; less predictable gain in linear stages.	Select only if cost sensitivity outweighs gain consistency and thermal integration needs.

Compared with MJD2058G and BD241C, the KSD2058YTSTU offers superior thermal integration via its insulated TO-220F package and tighter h_FE binning-making it preferred for production audio amplifiers and industrial relay modules where reliability and thermal predictability are critical.

Availability

KSD2058YTSTU is available at Aetrix Electronics and suitable for audio power amplifiers, DC motor drivers, relay/solenoid interfaces, and linear regulator pass elements requiring stable component supply and long-term industrial availability.

Supply support for KSD2058YTSTU 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 (acquired Fairchild Semiconductor in 2016) designs and manufactures high-performance analog, discrete, and power management semiconductors for automotive, industrial, and cloud power applications.

The KSD2058YTSTU belongs to Fairchild's legacy low-frequency power transistor family, engineered specifically for robust linear amplification and industrial switching where thermal resilience and gain consistency outweigh high-speed performance.

FAQ

What is the guaranteed h_FE range for KSD2058YTSTU?

The KSD2058YTSTU is Y-class binned with a guaranteed DC current gain (h_FE) of 100–200 when measured at V_CE = 5 V and I_C = 0.5 A. This tight binning ensures predictable base drive requirements and consistent performance across production lots of the KSD2058YTSTU in amplifier and switching circuits.

Is KSD2058YTSTU compatible with TO-220 heatsinks?

Yes-the KSD2058YTSTU uses a TO-220F package with an electrically insulated metal tab, allowing direct mechanical and thermal attachment to standard TO-220 heatsinks without additional insulating hardware. This feature simplifies thermal design and improves reliability compared to non-insulated variants like standard TO-220.

What is the maximum continuous collector current for KSD2058YTSTU?

The KSD2058YTSTU is rated for a continuous collector current (I_C) of 3 A at case temperature T_C = 25°C. Operation at higher currents requires active heatsinking and adherence to the published power derating curve, which reduces allowable dissipation linearly above 25°C case temperature.

Does KSD2058YTSTU support pulse operation beyond its DC ratings?

Yes-the KSD2058YTSTU's Safe Operating Area (SOA) chart confirms pulsed operation up to 100 ms at 60 V and 3 A. Pulse width, voltage, and current must remain within the SOA boundary; for example, 10 ms pulses at 40 V/2.5 A are permissible without secondary breakdown risk in the KSD2058YTSTU.

What is the typical V_CE(sat) of KSD2058YTSTU under switching conditions?

The KSD2058YTSTU exhibits a maximum V_CE(sat) of 1.5 V when operated at I_C = 2 A and I_B = 0.2 A. Typical values are lower (~1.2 V), enabling efficient saturated switching in relay drivers and low-speed motor controllers where conduction loss must be minimized in the KSD2058YTSTU.

KSD2058YTSTU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-3 Full Pack

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 3 A

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

Vce Saturation (Max) @ Ib, Ic:: 1.5V @ 200mA, 2A

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 500mA, 5V

Power - Max:: 1.5 W

Frequency - Transition:: 400kHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220F-3

KSD2058YTSTU FAQ

1.How can I place an order for KSD2058YTSTU through Aetrix?

Please submit a Request for Quotation (RFQ) for KSD2058YTSTU 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 KSD2058YTSTU reliable?

The price and inventory of KSD2058YTSTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSD2058YTSTU is usually 5 days.

3.What payment methods are accepted for KSD2058YTSTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSD2058YTSTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSD2058YTSTU?

KSD2058YTSTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSD2058YTSTU 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 KSD2058YTSTU?

For technical support, including KSD2058YTSTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSD2058YTSTU requirements.

6.How does Aetrix verify that KSD2058YTSTU is sourced from the original manufacturer or authorized distributors?

All KSD2058YTSTU 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 KSD2058YTSTU meets industry standards.

7.What is the process for return or replacement of KSD2058YTSTU?

All KSD2058YTSTU units undergo pre-shipment inspection (PSI). If there is an issue with KSD2058YTSTU, 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 KSD2058YTSTU part is unused and in its original packaging.

Return procedure for KSD2058YTSTU:

1.Submit a request within 90 days.

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

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