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

onsemi KSD471AYTA

Name: KSD471AYTA
Brand: onsemi
SKU: KSD471AYTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSD471AYTA

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: KSD471AYTA.pdf

Description:: TRANS NPN 30V 1A TO-92-3

Quantity:: RFQ Add To RFQ list

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Inventory:3,969

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Product details

Overview

KSD471AYTA from onsemi is an NPN epitaxial silicon transistor designed for audio frequency power amplification, with a 1 A collector current rating, 800 mW collector power dissipation, and 30 V collector-emitter breakdown voltage (V_CEO). It operates in TO-92-3LF (Pb-free) package and serves as a complementary device to KSB1151 in push-pull amplifier stages.

For engineers reviewing the KSD471AYTA datasheet, pinout, applications, or equivalent options, key selection considerations include its DC current gain range (120–240 at I_C = 100 mA), saturation voltages (V_CE(sat) ≤ 0.5 V, V_BE(sat) ≤ 1.2 V at I_C = 1 A), and 130 MHz f_T bandwidth capability.

Technical Context

This discrete NPN bipolar junction transistor is optimized for linear audio amplification and switching applications where moderate current drive and thermal stability up to 150 °C junction temperature are required. Its 40 V V_CBO, 5 V V_EBO, and low output capacitance (16 pF at 6 V) support reliable operation in Class-A/AB amplifier output stages and driver circuits.

The device uses epitaxial base construction to achieve consistent h_FE performance and controlled saturation characteristics. Pin configuration follows standard TO-92 orientation: Emitter (Pin 1), Base (Pin 2), Collector (Pin 3), with center-collector variant suffixes explicitly excluded for KSD471AYTA per ordering information.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	30 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration
I_C	1 A - Continuous collector current handling capacity under specified thermal conditions
P_C	800 mW - Maximum power dissipation at T_A = 25 °C without derating
h_FE	120–240 - DC current gain at V_CE = 1 V, I_C = 100 mA, defining small-signal amplification linearity
f_T	130 MHz - Transition frequency indicating usable bandwidth for RF-coupled audio or broadband pre-driver use
C_ob	16 pF - Output capacitance at V_CB = 6 V, influencing high-frequency stage stability and Miller effect

Pinout & Package

Package: TO-92-3LF (Pb-free), case outline 135AR, lead-formed, dimensions 4.83 mm × 4.76 mm.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current exit terminal; connected to ground or low-impedance return path in common-emitter amplifier
2	Base	Control input; requires current-limited drive to bias transistor into active or saturation region
3	Collector	Current entry terminal; connects to load or supply rail in low-side switch or amplifier output stage

Key Features

Feature	Design Value
Audio frequency power amplification	Optimized h_FE consistency and low V_CE(sat) enable efficient Class-A/AB output stages up to ~20 kHz
Complementary pairing	Matched electrical profile with KSB1151 (PNP) supports symmetrical push-pull amplifier design
Thermal robustness	150 °C maximum junction temperature allows operation in enclosed audio enclosures without forced cooling
Pb-free packaging	TO-92-3LF (case 135AR) meets RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 3 marking

Applications

Audio Power Amplifier	DC Motor Driver
Use Scenario: Low-cost stereo amplifier output stage delivering up to 1 W into 8 Ω loads. IC Role / Device Role / Timing Role: NPN power transistor operating in Class-AB linear mode with emitter-follower biasing. Use Value: Delivers low-distortion audio output with V_CE(sat) ≤ 0.5 V minimizing heat generation at full drive.	Use Scenario: Unidirectional 12 V DC motor control in consumer appliances. IC Role / Device Role / Timing Role: Low-side switch controlling motor current via base-driven saturation. Use Value: Handles 1 A continuous motor stall current with 800 mW dissipation managed by PCB copper area.
Signal Generator Output Stage	LED Constant-Current Driver
Use Scenario: Buffered sine/square wave output stage in benchtop function generators. IC Role / Device Role / Timing Role: Voltage-controlled current source shaping output impedance and drive capability. Use Value: 130 MHz f_T ensures flat amplitude response up to 100 kHz with minimal phase shift.	Use Scenario: High-brightness LED string driver in indicator panels. IC Role / Device Role / Timing Role: Linear current regulator using emitter resistor feedback and base bias control. Use Value: Stable h_FE (120–240) enables predictable current setting across unit-to-unit variation.

Audio Power Amplifier

DC Motor Driver

Use Scenario: Low-cost stereo amplifier output stage delivering up to 1 W into 8 Ω loads.

IC Role / Device Role / Timing Role: NPN power transistor operating in Class-AB linear mode with emitter-follower biasing.

Use Value: Delivers low-distortion audio output with V_CE(sat) ≤ 0.5 V minimizing heat generation at full drive.

Use Scenario: Unidirectional 12 V DC motor control in consumer appliances.

IC Role / Device Role / Timing Role: Low-side switch controlling motor current via base-driven saturation.

Use Value: Handles 1 A continuous motor stall current with 800 mW dissipation managed by PCB copper area.

Signal Generator Output Stage

LED Constant-Current Driver

Use Scenario: Buffered sine/square wave output stage in benchtop function generators.

IC Role / Device Role / Timing Role: Voltage-controlled current source shaping output impedance and drive capability.

Use Value: 130 MHz f_T ensures flat amplitude response up to 100 kHz with minimal phase shift.

Use Scenario: High-brightness LED string driver in indicator panels.

IC Role / Device Role / Timing Role: Linear current regulator using emitter resistor feedback and base bias control.

Use Value: Stable h_FE (120–240) enables predictable current setting across unit-to-unit variation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD47T1G	TO-220 package, higher P_C = 1.5 W, same V_CEO = 30 V, h_FE = 100–300	Requires heatsink for >500 mW; suited for higher-power audio or industrial drivers	Select when board space allows TO-220 and thermal budget exceeds 800 mW
BC547C	TO-92, lower I_C = 100 mA, P_C = 500 mW, h_FE = 420–800	Limited to pre-amplifier or signal switching; not suitable for 1 A load switching	Select only for low-current signal-level amplification where gain uniformity matters more than power

Compared with MJD47T1G and BC547C, the KSD471AYTA uniquely balances 1 A current capability, TO-92 form factor, and audio-optimized gain-bandwidth trade-off-making it appropriate for compact, thermally constrained power amplification where TO-220 is impractical and BC547C lacks current headroom.

Availability

KSD471AYTA is available at Aetrix Electronics and suitable for audio power amplifiers, DC motor drivers, signal generator output stages, and LED constant-current drivers requiring stable component supply and Pb-free compliance.

Supply support for KSD471AYTA 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

onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The KSD471AYTA belongs to onsemi's legacy discrete transistor product line, engineered specifically for cost-sensitive, medium-power linear and switching applications in audio and general-purpose electronics.

FAQ

What is the pin configuration of the KSD471AYTA?

The KSD471AYTA uses a standard TO-92-3LF package with pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. This configuration is confirmed in the official onsemi datasheet (Ordering Information, page 3) and mechanical drawings (Case 135AR). The "YTA" suffix denotes Pb-free TO-92-3LF packaging, not center-collector orientation.

Is the KSD471AYTA still in active production?

No-the KSD471AYTA is marked as discontinued per the onsemi datasheet revision history (Rev 4, January 2026). However, Aetrix Electronics maintains legacy inventory and offers lifecycle support including last-time buy planning and cross-reference assistance for the KSD471AYTA to ensure continuity for existing designs.

What is the maximum junction temperature for the KSD471AYTA?

The KSD471AYTA has a maximum junction temperature (T_J) of 150 °C, as specified in the Absolute Maximum Ratings table. This value defines the upper thermal limit for reliable operation; sustained operation above this temperature risks permanent degradation of the epitaxial structure and h_FE drift.

How does the KSD471AYTA compare to the KSD471ACYTA?

The KSD471AYTA and KSD471ACYTA share identical electrical specifications but differ in packaging: KSD471AYTA uses TO-92-3LF (Case 135AR, lead-formed), while KSD471ACYTA uses standard TO-92-3 (Case 135AN). Both are Pb-free, but KSD471AYTA's lead-formed geometry simplifies automated insertion and improves mechanical stability on PCBs.

Can the KSD471AYTA be used as a direct replacement for the KSB1151?

No-the KSD471AYTA is an NPN transistor and KSB1151 is a complementary PNP device; they are intended for paired use (e.g., push-pull output stages), not substitution. Replacing KSB1151 with KSD471AYTA would invert circuit polarity and cause functional failure. Their matching h_FE, V_CEO, and I_C ratings enable symmetric design-not interchangeability.

KSD471AYTA Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Packaging:: Cut Tape (CT)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 1 A

Voltage - Collector Emitter Breakdown (Max):: 30 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 100mA, 1A

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 120 @ 100mA, 1V

Power - Max:: 800 mW

Frequency - Transition:: 130MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

KSD471AYTA FAQ

1.How can I place an order for KSD471AYTA through Aetrix?

Please submit a Request for Quotation (RFQ) for KSD471AYTA 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 KSD471AYTA reliable?

The price and inventory of KSD471AYTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSD471AYTA is usually 5 days.

3.What payment methods are accepted for KSD471AYTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSD471AYTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSD471AYTA?

KSD471AYTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSD471AYTA 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 KSD471AYTA?

For technical support, including KSD471AYTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSD471AYTA requirements.

6.How does Aetrix verify that KSD471AYTA is sourced from the original manufacturer or authorized distributors?

All KSD471AYTA 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 KSD471AYTA meets industry standards.

7.What is the process for return or replacement of KSD471AYTA?

All KSD471AYTA units undergo pre-shipment inspection (PSI). If there is an issue with KSD471AYTA, 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 KSD471AYTA part is unused and in its original packaging.

Return procedure for KSD471AYTA:

1.Submit a request within 90 days.

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

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