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

onsemi KSD471ACYTA

Name: KSD471ACYTA
Brand: onsemi
SKU: KSD471ACYTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSD471ACYTA

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: KSD471ACYTA.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSD471ACYTA 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 features a center-collector TO-92–3 package (Case 135AN), complementary pairing with KSB1151, and is used in low-power audio output stages and driver circuits.

For engineers reviewing the KSD471ACYTA datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain (h_FE = 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), f_T = 130 MHz, and thermal limits (T_J = 150 °C).

Technical Context

This discrete NPN bipolar junction transistor operates in linear and switching modes, optimized for audio-frequency signal amplification up to ~130 MHz bandwidth. Its design emphasizes stable DC current gain across I_C = 10 mA–1 A and low saturation voltage under high-current drive conditions.

The device uses epitaxial base construction for improved f_T and reduced Cob (16 pF at V_CB = 6 V), enabling reliable performance in Class-A/AB amplifier stages and medium-speed switching applications where thermal management within TO-92 constraints is critical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	30 V - Maximum safe collector-emitter voltage before breakdown; defines usable supply rail headroom in amplifier designs.
I_C	1 A - Continuous collector current rating; supports audio output stages driving 4–8 Ω loads at ~1 W.
P_C	800 mW - Max power dissipation at T_A = 25 °C; requires heatsinking or derating above ambient.
h_FE	120–240 - DC current gain at V_CE = 1 V, I_C = 100 mA; ensures predictable bias stability in fixed-bias or emitter-degenerated topologies.
f_T	130 MHz - Current-gain bandwidth product; enables faithful amplification of harmonics up to mid-VHF range in wideband audio drivers.
C_ob	16 pF - Output capacitance at V_CB = 6 V; impacts high-frequency roll-off and stability in multi-stage amplifiers.

Pinout & Package

Package: TO-92–3 (Case 135AN), Pb-free, center-collector configuration (Pin 1: Emitter, Pin 2: Base, Pin 3: Collector).

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit path for majority carriers	Connected to ground or emitter resistor; sets bias point and AC signal reference in common-emitter configurations.
2 (Base)	Control electrode for minority carrier injection	Receives drive current (I_B ≈ I_C/h_FE); requires current-limiting resistor to prevent overdrive.
3 (Collector)	Current entry path and output terminal	Connected to V_CC via load resistor or transformer; delivers amplified current to speaker or next stage.

Key Features

Feature	Design Value
Complementary pairing	Matched as NPN counterpart to KSB1151 PNP transistor, enabling push-pull audio output stages without gain mismatch.
Center-collector leadform	Pin 3 = Collector (1–Emitter, 2–Base, 3–Collector) simplifies PCB layout symmetry in dual-transistor amplifier modules.
High f_T / low C_ob balance	130 MHz f_T with only 16 pF Cob supports clean transient response and minimal phase shift in 20 Hz–20 kHz audio bands.
Robust thermal rating	150 °C maximum junction temperature allows operation in enclosed enclosures with moderate airflow or passive heatsinking.

Applications

Audio Power Amplifier Stage	Low-Voltage DC Motor Driver
Use Scenario: Final output stage in portable AM/FM radio receivers delivering ~0.5–1 W into 8 Ω speakers. IC Role / Device Role / Timing Role: NPN power switch/amplifier operating in Class-A or Class-AB mode with fixed bias network. Use Value: Delivers full audio bandwidth with <0.5 V saturation drop at 1 A, minimizing heat generation and preserving battery life.	Use Scenario: H-bridge half-bridge leg in 5–12 V brushed DC motor control for toys, small actuators, or fan speed regulation. IC Role / Device Role / Timing Role: Medium-current switching transistor driven by microcontroller GPIO or dedicated gate driver. Use Value: Supports 1 A continuous motor stall current with fast turn-on (driven by 100 mA base current) and low V_CE(sat) to reduce conduction loss.
Complementary Push-Pull Pair	Signal Generator Output Buffer
Use Scenario: Paired with KSB1151 in symmetrical push-pull topology for zero-crossing distortion reduction in line-level audio buffers. IC Role / Device Role / Timing Role: NPN half of complementary emitter-follower pair providing low-impedance, unity-gain output drive. Use Value: Matches KSB1151's h_FE and V_BE(sat) characteristics to minimize crossover distortion below 100 mW output.	Use Scenario: Output stage of function generator ICs (e.g., ICL8038-based designs) driving 50 Ω coaxial cables or oscilloscope inputs. IC Role / Device Role / Timing Role: Wideband buffer amplifier operating linearly up to 10 MHz with minimal harmonic distortion. Use Value: 130 MHz f_T and 16 pF Cob ensure flat gain response and fast edge fidelity for square/triangle waveforms.

Audio Power Amplifier Stage

Low-Voltage DC Motor Driver

Use Scenario: Final output stage in portable AM/FM radio receivers delivering ~0.5–1 W into 8 Ω speakers.

IC Role / Device Role / Timing Role: NPN power switch/amplifier operating in Class-A or Class-AB mode with fixed bias network.

Use Value: Delivers full audio bandwidth with <0.5 V saturation drop at 1 A, minimizing heat generation and preserving battery life.

Use Scenario: H-bridge half-bridge leg in 5–12 V brushed DC motor control for toys, small actuators, or fan speed regulation.

IC Role / Device Role / Timing Role: Medium-current switching transistor driven by microcontroller GPIO or dedicated gate driver.

Use Value: Supports 1 A continuous motor stall current with fast turn-on (driven by 100 mA base current) and low V_CE(sat) to reduce conduction loss.

Complementary Push-Pull Pair

Signal Generator Output Buffer

Use Scenario: Paired with KSB1151 in symmetrical push-pull topology for zero-crossing distortion reduction in line-level audio buffers.

IC Role / Device Role / Timing Role: NPN half of complementary emitter-follower pair providing low-impedance, unity-gain output drive.

Use Value: Matches KSB1151's h_FE and V_BE(sat) characteristics to minimize crossover distortion below 100 mW output.

Use Scenario: Output stage of function generator ICs (e.g., ICL8038-based designs) driving 50 Ω coaxial cables or oscilloscope inputs.

IC Role / Device Role / Timing Role: Wideband buffer amplifier operating linearly up to 10 MHz with minimal harmonic distortion.

Use Value: 130 MHz f_T and 16 pF Cob ensure flat gain response and fast edge fidelity for square/triangle waveforms.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
KSC1845FTA	Higher V_CEO = 50 V, lower h_FE = 70–140, same TO-92–3 package	Better suited for higher-supply designs (>30 V) but less gain margin in low-voltage bias networks	Select when operating above 30 V or requiring higher breakdown safety margin
MPSA13	Lower I_C = 500 mA, higher h_FE = 100–400, same pinout	Optimized for low-current, high-gain preamp stages-not rated for 1 A continuous output	Select for voltage amplification or low-power driver roles where 1 A capability is unnecessary

Compared with KSD471ACYTA, KSC1845FTA offers greater voltage headroom but reduced DC gain consistency, while MPSA13 provides superior h_FE at half the current rating-making KSD471ACYTA the optimal choice for 1 A, 30 V audio output stages requiring balanced gain, speed, and thermal robustness in TO-92.

Availability

KSD471ACYTA is available at Aetrix Electronics and suitable for audio amplifier modules, DC motor control circuits, and complementary transistor pair designs requiring stable component supply and Pb-free compliance.

Supply support for KSD471ACYTA 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 supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The KSD471ACYTA belongs to onsemi's general-purpose bipolar transistor product line, engineered for cost-sensitive, medium-power linear and switching applications in audio, power management, and interface circuits.

FAQ

What is the pin configuration of KSD471ACYTA?

KSD471ACYTA uses a center-collector TO-92–3 package (Case 135AN) with Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. This configuration is explicitly marked in the datasheet's "Suffix '−C' means Center Collector" note and confirmed in the mechanical outline diagram. The KSD471ACYTA pinout supports direct integration into complementary amplifier layouts with KSB1151.

Is KSD471ACYTA suitable for switching applications?

Yes, KSD471ACYTA is suitable for medium-speed switching applications such as DC motor control and relay drivers. Its V_CE(sat) ≤ 0.5 V at I_C = 1 A and I_B = 0.1 A, combined with f_T = 130 MHz, enables efficient on/off operation up to ~100 kHz. However, it is not optimized for high-frequency SMPS due to TO-92 thermal limitations and lack of specified switching time parameters.

What is the maximum junction temperature for KSD471ACYTA?

The maximum junction temperature (T_J) for KSD471ACYTA is 150 °C, as specified in the Absolute Maximum Ratings table. This rating applies under steady-state conditions with proper PCB copper area or heatsinking. Derating is required above 25 °C ambient per the datasheet's thermal resistance curve, and operation beyond 150 °C risks permanent parametric shift or failure.

Does KSD471ACYTA have Pb-free packaging?

Yes, KSD471ACYTA is manufactured in a Pb-free TO-92–3 package (Case 135AN), as confirmed in the Ordering Information table: "KSD471ACYTA TO−92−3 (Pb−Free)". It complies with RoHS Directive 2011/65/EU and meets JEDEC J-STD-609A Class 1 marking requirements for lead-free terminations.

How does KSD471ACYTA compare to KSD471AYTA?

KSD471ACYTA and KSD471AYTA share identical electrical specifications but differ in packaging: KSD471ACYTA uses standard TO-92–3 (Case 135AN), while KSD471AYTA uses TO-92–3LF (Case 135AR) with lead-formed leads. Both are Pb-free, but KSD471ACYTA has straight leads suitable for through-hole wave soldering, whereas KSD471AYTA's formed leads target automated insertion or specific board clearance needs.

KSD471ACYTA 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

KSD471ACYTA FAQ

1.How can I place an order for KSD471ACYTA through Aetrix?

Please submit a Request for Quotation (RFQ) for KSD471ACYTA 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 KSD471ACYTA reliable?

The price and inventory of KSD471ACYTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSD471ACYTA is usually 5 days.

3.What payment methods are accepted for KSD471ACYTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSD471ACYTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSD471ACYTA?

KSD471ACYTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSD471ACYTA 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 KSD471ACYTA?

For technical support, including KSD471ACYTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSD471ACYTA requirements.

6.How does Aetrix verify that KSD471ACYTA is sourced from the original manufacturer or authorized distributors?

All KSD471ACYTA 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 KSD471ACYTA meets industry standards.

7.What is the process for return or replacement of KSD471ACYTA?

All KSD471ACYTA units undergo pre-shipment inspection (PSI). If there is an issue with KSD471ACYTA, 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 KSD471ACYTA part is unused and in its original packaging.

Return procedure for KSD471ACYTA:

1.Submit a request within 90 days.

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

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