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

onsemi KSA928AOTA

Name: KSA928AOTA
Brand: onsemi
SKU: KSA928AOTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSA928AOTA

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 Long Body, Formed Leads

Datasheet:: KSA928AOTA.pdf

Description:: TRANS PNP 30V 2A TO-92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSA928AOTA from onsemi is a PNP epitaxial silicon transistor designed for audio power amplifier stages, with −30 V V_CEO, −2 A I_C, 1000 mW P_D, 120 MHz f_T, and TO-92 3 LF package. It serves as a complement to KSC2328A in push-pull output configurations for portable audio systems.

For engineers reviewing the KSA928AOTA datasheet, pinout, applications, or equivalent options, key selection factors include its PNP polarity, −30 V breakdown rating, DC current gain range (100–320), saturation voltage under high-current drive (≤−2.0 V at I_C = −1.5 A), and thermal resistance of 125 °C/W in standard FR-4 layout.

Technical Context

This device operates as a medium-power general-purpose PNP bipolar junction transistor optimized for linear amplification and switching in low-voltage audio output stages. Its h_FE classification spans two bins (O: 100–200; Y: 160–320), supporting consistent biasing across production lots.

The KSA928AOTA features a maximum junction temperature of 150 °C and derates at 8.0 mW/°C above 25 °C ambient. Its Cob of 48 pF at V_CB = −10 V enables stable high-frequency response in Class-A or AB amplifier topologies without excessive Miller effect.

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	−2 A: Continuous collector current handling capacity for sustained audio output drive
P_D	1000 mW: Power dissipation limit at 25 °C ambient, defining heatsink requirements
f_T	120 MHz: Current gain bandwidth product enabling stable operation up to mid-audio frequencies
h_FE	100–320: DC current gain range ensuring predictable base drive sizing across variants
V_CE(sat)	≤−2.0 V at I_C = −1.5 A: Low saturation voltage minimizes power loss in switching applications
C_ob	48 pF at V_CB = −10 V: Output capacitance affecting high-frequency stability and slew rate

Pinout & Package

Package: TO-92 3 LF (Case 135AM), Pb-free, lead-formed, 8.0 mm × 4.9 mm footprint. Designed for through-hole mounting with standard FR-4 PCB land pattern per onsemi specification.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current exit terminal; connects to ground or negative rail in common-emitter amplifier
2	Collector	Current entry terminal; ties to load (e.g., speaker transformer or output coupling cap)
3	Base	Control terminal; accepts bias current to regulate collector-emitter conduction

Key Features

Feature	Design Value
Complementary pairing	Matched performance with KSC2328A NPN for push-pull audio output stage symmetry
High f_T	120 MHz bandwidth supports clean reproduction of harmonics up to 20 kHz with margin
Low V_CE(sat)	≤−2.0 V at −1.5 A ensures <2 W conduction loss in 3 W output applications
Wide h_FE range	100–320 allows flexible base resistor selection across manufacturing batches
Pb-free TO-92	RoHS-compliant lead-formed package compatible with automated through-hole assembly

Applications

Portable Audio Amplifiers	DC Motor Drivers
Use Scenario: Compact battery-powered speaker systems requiring efficient 3 W output into 4 Ω or 8 Ω loads. IC Role / Device Role / Timing Role: PNP output transistor in Class-AB push-pull pair delivering amplified audio signal to speaker terminals. Use Value: −30 V V_CEO and −2 A I_C enable robust operation under transient peaks without clipping or second breakdown.	Use Scenario: Bidirectional 12 V brushed DC motor control in robotics or actuator modules. IC Role / Device Role / Timing Role: High-side PNP switch in H-bridge half-bridge configuration controlling motor direction and braking. Use Value: Low V_CE(sat) (≤−2.0 V) reduces heat generation during PWM-driven conduction, extending thermal margin.
LED Constant-Current Drivers	Power Supply Pass Transistors
Use Scenario: Adjustable constant-current source for high-brightness LED arrays in signage or lighting. IC Role / Device Role / Timing Role: Linear current regulator using emitter-follower configuration with sense-resistor feedback. Use Value: Stable h_FE (100–320) and 150 °C T_J support precise current setting over temperature without gain drift.	Use Scenario: Series pass element in adjustable linear voltage regulators for analog subsystems. IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output by dissipating excess input-output differential. Use Value: 1000 mW P_D and 125 °C/W R_θJA define maximum allowable dropout voltage at rated load current.

Portable Audio Amplifiers

DC Motor Drivers

Use Scenario: Compact battery-powered speaker systems requiring efficient 3 W output into 4 Ω or 8 Ω loads.

IC Role / Device Role / Timing Role: PNP output transistor in Class-AB push-pull pair delivering amplified audio signal to speaker terminals.

Use Value: −30 V V_CEO and −2 A I_C enable robust operation under transient peaks without clipping or second breakdown.

Use Scenario: Bidirectional 12 V brushed DC motor control in robotics or actuator modules.

IC Role / Device Role / Timing Role: High-side PNP switch in H-bridge half-bridge configuration controlling motor direction and braking.

Use Value: Low V_CE(sat) (≤−2.0 V) reduces heat generation during PWM-driven conduction, extending thermal margin.

LED Constant-Current Drivers

Power Supply Pass Transistors

Use Scenario: Adjustable constant-current source for high-brightness LED arrays in signage or lighting.

IC Role / Device Role / Timing Role: Linear current regulator using emitter-follower configuration with sense-resistor feedback.

Use Value: Stable h_FE (100–320) and 150 °C T_J support precise current setting over temperature without gain drift.

Use Scenario: Series pass element in adjustable linear voltage regulators for analog subsystems.

IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output by dissipating excess input-output differential.

Use Value: 1000 mW P_D and 125 °C/W R_θJA define maximum allowable dropout voltage at rated load current.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD2955G	TO-220 package, higher P_D (115 W), lower f_T (3 MHz), same −60 V V_CEO	Suited for higher-power discrete amplifiers; not drop-in due to package and pinout mismatch	Select when >3 W output or heatsink-mounting required; verify PCB layout change
KSA733Y	TO-92 package, lower P_D (250 mW), lower I_C (−150 mA), same polarity and pinout	Targeted at preamplifier or driver stages-not suitable for 3 W output loads	Use only in low-current signal paths; insufficient for KSA928AOTA's output-stage role

Compared with MJD2955G and KSA733Y, the KSA928AOTA uniquely balances TO-92 form factor, 3 W capability, and 120 MHz f_T, making it optimal for space-constrained yet performance-demanding audio output stages where thermal management and bandwidth coexist.

Availability

KSA928AOTA is available at Aetrix Electronics and suitable for portable audio amplifiers, DC motor drivers, LED constant-current drivers, and linear regulator pass elements requiring stable component supply and RoHS-compliant through-hole transistors.

Supply support for KSA928AOTA 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 focused on energy-efficient electronics, serving automotive, industrial, cloud, and IoT markets with discrete, analog, and logic solutions.

The KSA928AOTA belongs to onsemi's general-purpose bipolar transistor product line, engineered for cost-sensitive, medium-power linear and switching applications in consumer and industrial equipment.

FAQ

What is the maximum continuous collector current rating for KSA928AOTA?

The KSA928AOTA has a maximum continuous collector current (I_C) rating of −2 A at T_A = 25 °C. This rating assumes proper PCB thermal design per onsemi's specified FR-4 land pattern. Derating applies above 25 °C ambient at 8.0 mW/°C, and operation beyond this limit risks thermal runaway or second breakdown. The KSA928AOTA must be used within this boundary to ensure reliability in audio output or switching applications.

Is KSA928AOTA pin-compatible with KSC2328A?

No, the KSA928AOTA is not pin-compatible with KSC2328A. While they are complementary PNP/NPN devices intended for push-pull use, the KSA928AOTA uses TO-92 3 LF (Emitter–Collector–Base pinout), whereas KSC2328A uses TO-92 3 LF with Collector–Emitter–Base pinout. Physical layout must account for reversed pin assignments; direct substitution without board revision will cause circuit failure. The KSA928AOTA requires correct orientation matching its 1–2–3 pin mapping.

What does the "OTA" suffix indicate in KSA928AOTA?

"OTA" in KSA928AOTA denotes onsemi's Pb-free, lead-formed TO-92 packaging variant compliant with RoHS Directive 2011/65/EU. It specifies tape-and-reel (fan-fold) shipping of 2000 units per reel, with lead finish meeting JEDEC J-STD-020 moisture sensitivity level 1. The KSA928AOTA differs from non-Pb-free versions like KSA928A in solderability profile and environmental compliance-no functional or electrical differences exist between OTA and non-OTA variants.

Can KSA928AOTA be used in switching applications?

Yes, the KSA928AOTA supports switching applications such as H-bridge motor control or LED dimming, provided operating conditions remain within absolute maximum ratings. Its V_CE(sat) ≤ −2.0 V at I_C = −1.5 A and f_T = 120 MHz allow fast turn-on/turn-off with minimal conduction loss. However, switching speed is limited by minority-carrier storage time; for high-frequency (>100 kHz) PWM, consider Schottky-clamped or RF-optimized alternatives. The KSA928AOTA remains viable for ≤20 kHz switching in motor and lighting control.

What is the typical DC current gain (h_FE) of KSA928AOTA at I_C = −500 mA?

The typical DC current gain (h_FE) of KSA928AOTA at V_CE = −2 V and I_C = −500 mA is not specified as a single value but falls within the bin-dependent range: 100–200 for "O" grade or 160–320 for "Y" grade. onsemi does not publish a typical h_FE number-only min/max bounds per classification. Designers must size base drive for worst-case h_FE (100) to guarantee saturation. The KSA928AOTA's h_FE remains stable across temperature, supporting consistent bias in audio and power circuits.

KSA928AOTA Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Long Body, Formed Leads

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 2 A

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

Vce Saturation (Max) @ Ib, Ic:: 2V @ 30mA, 1.5A

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 500mA, 2V

Power - Max:: 1 W

Frequency - Transition:: 120MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

KSA928AOTA FAQ

1.How can I place an order for KSA928AOTA through Aetrix?

Please submit a Request for Quotation (RFQ) for KSA928AOTA 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 KSA928AOTA reliable?

The price and inventory of KSA928AOTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSA928AOTA is usually 5 days.

3.What payment methods are accepted for KSA928AOTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSA928AOTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSA928AOTA?

KSA928AOTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSA928AOTA 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 KSA928AOTA?

For technical support, including KSA928AOTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSA928AOTA requirements.

6.How does Aetrix verify that KSA928AOTA is sourced from the original manufacturer or authorized distributors?

All KSA928AOTA 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 KSA928AOTA meets industry standards.

7.What is the process for return or replacement of KSA928AOTA?

All KSA928AOTA units undergo pre-shipment inspection (PSI). If there is an issue with KSA928AOTA, 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 KSA928AOTA part is unused and in its original packaging.

Return procedure for KSA928AOTA:

1.Submit a request within 90 days.

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

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