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

onsemi KSA1150OTA

Name: KSA1150OTA
Brand: onsemi
SKU: KSA1150OTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSA1150OTA

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 Short Body

Datasheet:: KSA1150OTA.pdf

Description:: TRANS PNP 20V 0.5A TO-92S

Quantity:: RFQ Add To RFQ list

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Inventory:2,460

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Product details

Overview

KSA1150OTA from ON Semiconductor (formerly Fairchild) is a PNP epitaxial silicon transistor designed for low-frequency power amplification and switching applications, with −20 V V_CEO, −500 mA I_C, 300 mW P_C, TO-92S package, and h_FE range of 40–400 at I_C = −100 mA.

For engineers reviewing the KSA1150OTA datasheet, pinout, applications, or equivalent options, key selection criteria include its complementary pairing with KSC2710, low saturation voltage (V_CE(sat) ≤ −0.4 V), high DC current gain, and suitability for audio amplifier stages and relay drivers in industrial control systems.

Technical Context

This PNP bipolar junction transistor operates in linear and saturated modes, supporting DC and low-frequency signal amplification up to several hundred kHz. Its design emphasizes stable h_FE across collector current (−1 mA to −500 mA) and low V_BE(sat) (−1.3 V max) under forced β = 10 conditions.

The device features tight breakdown voltage tolerances (BVCBO = −40 V, BVCEO = −20 V), nanoscale leakage (ICBO ≤ −100 nA), and thermal robustness (T_J = 150 °C), enabling reliable operation in ambient temperatures up to 125 °C when derated per PC vs. TA curves.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−20 V - Maximum safe collector-emitter voltage before avalanche in open-base configuration
I_C (DC)	−500 mA - Continuous collector current rating defining linear/saturation operating envelope
P_C	300 mW - Thermal power limit at T_A = 25 °C; requires heatsinking above ~65 °C ambient
h_FE	40–400 - DC current gain range at V_CE = −1 V, I_C = −100 mA; supports bias stability across variants
V_CE(sat)	−0.3 to −0.4 V - Low saturation voltage at I_C = −500 mA / I_B = −50 mA, minimizing conduction loss
V_BE(sat)	−1.0 to −1.3 V - Base-emitter drive requirement under hard saturation, informing driver stage design
T_J	150 °C - Maximum junction temperature; sets PCB copper area and thermal relief requirements

Pinout & Package

Package: TO-92S - 3-lead plastic through-hole package with 1.27 mm lead pitch, 4.00 mm height, and standardized EIAJ outline. Lead finish: matte tin.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current source terminal	Connected to higher potential rail in PNP switch/amplifier; defines current direction and bias polarity
2 (Collector)	Current sink terminal	Typically tied to load or next stage input; voltage swing limited by V_CEO and thermal dissipation
3 (Base)	Control input	Receives forward-biased current to enable conduction; requires series resistor to limit I_B per h_FE and V_BE(sat)

Key Features

Feature	Design Value
Complementary pair with KSC2710	Enables balanced push-pull output stages without discrete matching; simplifies dual-rail amplifier design
Low V_CE(sat) (≤ −0.4 V)	Reduces power loss and self-heating in switching applications, improving efficiency in relay and lamp drivers
High h_FE range (40–400)	Supports wide variation in base drive capability across production lots and temperature, easing bias network design
TO-92S package compatibility	Ensures drop-in replacement for legacy designs using standard TO-92 footprint while offering improved thermal profile
−100 nA ICBO leakage	Minimizes standby current in battery-powered circuits and improves signal integrity in high-impedance amplifier nodes

Applications

Audio Power Amplifier Stage	Relay Driver Circuit
Use Scenario: Final output stage in Class-A/B low-power audio amplifiers driving 8 Ω speakers up to 300 mW. IC Role / Device Role / Timing Role: PNP output transistor delivering current-sink capability in complementary emitter-follower configuration. Use Value: Low V_CE(sat) and high h_FE reduce crossover distortion and improve thermal stability at I_C = −300 mA.	Use Scenario: Driving 12 V/400 mA electromagnetic relays in PLC I/O modules and industrial control panels. IC Role / Device Role / Timing Role: High-current PNP switch turning on relay coil via emitter-grounded configuration. Use Value: −500 mA I_C rating and −0.4 V V_CE(sat) ensure full coil activation with <100 mW dissipation at 12 V supply.
DC Motor Speed Control	Linear Voltage Regulator Pass Element
Use Scenario: PWM-controlled H-bridge half-bridge leg for bidirectional 6–12 V DC motor control in robotics and actuation systems. IC Role / Device Role / Timing Role: Saturated PNP switch handling reverse current during freewheeling phase. Use Value: Fast turn-off (limited by stored charge) and low saturation loss maintain efficiency at 1–5 kHz PWM frequencies.	Use Scenario: Series pass element in adjustable linear regulators supplying 3.3–5 V at up to 300 mA for microcontroller subsystems. IC Role / Device Role / Timing Role: PNP pass transistor operating in active region to regulate output voltage via feedback loop. Use Value: Stable h_FE over temperature and low V_BE(sat) support precise dropout voltage control below 1.5 V.

Audio Power Amplifier Stage

Relay Driver Circuit

Use Scenario: Final output stage in Class-A/B low-power audio amplifiers driving 8 Ω speakers up to 300 mW.

IC Role / Device Role / Timing Role: PNP output transistor delivering current-sink capability in complementary emitter-follower configuration.

Use Value: Low V_CE(sat) and high h_FE reduce crossover distortion and improve thermal stability at I_C = −300 mA.

Use Scenario: Driving 12 V/400 mA electromagnetic relays in PLC I/O modules and industrial control panels.

IC Role / Device Role / Timing Role: High-current PNP switch turning on relay coil via emitter-grounded configuration.

Use Value: −500 mA I_C rating and −0.4 V V_CE(sat) ensure full coil activation with <100 mW dissipation at 12 V supply.

DC Motor Speed Control

Linear Voltage Regulator Pass Element

Use Scenario: PWM-controlled H-bridge half-bridge leg for bidirectional 6–12 V DC motor control in robotics and actuation systems.

IC Role / Device Role / Timing Role: Saturated PNP switch handling reverse current during freewheeling phase.

Use Value: Fast turn-off (limited by stored charge) and low saturation loss maintain efficiency at 1–5 kHz PWM frequencies.

Use Scenario: Series pass element in adjustable linear regulators supplying 3.3–5 V at up to 300 mA for microcontroller subsystems.

IC Role / Device Role / Timing Role: PNP pass transistor operating in active region to regulate output voltage via feedback loop.

Use Value: Stable h_FE over temperature and low V_BE(sat) support precise dropout voltage control below 1.5 V.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP low-frequency power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPSA92	Higher V_CEO (−300 V), lower I_C (−500 mA), same TO-92 package but different h_FE binning (25–250)	Better suited for high-voltage switching (e.g., flyback snubbers); less optimal for high-gain linear amplification	Select when V_CEO > −20 V is required and gain consistency at low I_C is secondary
KSA992	Same manufacturer family, −30 V V_CEO, −700 mA I_C, 625 mW P_C, TO-92 package	Higher power handling enables use in 500–600 mW amplifier stages; requires updated thermal layout	Choose for upgraded current/power margin while retaining pinout and bias topology

Compared with MPSA92 and KSA992, the KSA1150OTA offers tighter V_CEO/I_C balance for mid-range low-frequency amplification, optimized h_FE spread for predictable biasing, and proven thermal performance in TO-92S at 300 mW dissipation.

Availability

KSA1150OTA is available at Aetrix Electronics and suitable for audio amplifier stages, relay drivers, DC motor control circuits, and linear regulator pass elements requiring stable component supply and long-term industrial availability.

Supply support for KSA1150OTA 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) is a global supplier of energy-efficient semiconductor components for automotive, industrial, cloud computing, and IoT applications.

The KSA1150OTA belongs to Fairchild's legacy general-purpose bipolar transistor product line, engineered specifically for cost-sensitive, low-frequency analog and power-switching functions in consumer and industrial electronics.

FAQ

What is the maximum continuous collector current for the KSA1150OTA?

The KSA1150OTA supports a maximum continuous collector current (I_C) of −500 mA at T_A = 25 °C. Derating is required above this ambient temperature per the datasheet's power dissipation curve; at 70 °C ambient, the usable I_C drops to approximately −350 mA to maintain P_C ≤ 300 mW and T_J ≤ 150 °C. This rating applies under DC conditions with proper PCB copper area for heat spreading.

Is the KSA1150OTA pin-compatible with the KSC2710 NPN transistor?

Yes - the KSA1150OTA (PNP) and KSC2710 (NPN) share identical TO-92S package dimensions and pinout order (Emitter–Collector–Base), enabling direct complementary placement in push-pull or Class-B amplifier outputs. Their matched V_CEO/V_CBO, I_C, and h_FE ranges simplify symmetric circuit design without external balancing components.

What is the typical hFE value of the KSA1150OTA at I_C = −10 mA?

While the KSA1150OTA datasheet specifies h_FE min/max only at I_C = −100 mA (40–400), typical h_FE at I_C = −10 mA and V_CE = −1 V is approximately 120–220, based on Figure 2 (DC Current Gain vs. Collector Current). This range supports stable small-signal amplification in pre-driver and voltage amplifier stages where gain predictability is critical.

Does the KSA1150OTA have built-in ESD protection?

No - the KSA1150OTA is a standard bipolar junction transistor without integrated ESD protection diodes. System-level ESD safeguards (e.g., series resistors, TVS diodes on base/emitter lines) must be implemented externally per IEC 61000-4-2 Level 3 (8 kV contact) requirements, especially in handling and board assembly environments.

Can the KSA1150OTA be used in switching power supplies?

The KSA1150OTA is not recommended for switching power supplies operating above 100 kHz due to its relatively slow minority-carrier storage time and lack of specified f_T or switching speed parameters. It is qualified for low-frequency (<500 kHz) applications such as relay control and audio amplification, where saturation behavior and DC gain dominate over transition frequency.

KSA1150OTA Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Short Body

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 20 V

Vce Saturation (Max) @ Ib, Ic:: 400mV @ 50mA, 500mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 70 @ 100mA, 1V

Power - Max:: 300 mW

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92S

KSA1150OTA FAQ

1.How can I place an order for KSA1150OTA through Aetrix?

Please submit a Request for Quotation (RFQ) for KSA1150OTA 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 KSA1150OTA reliable?

The price and inventory of KSA1150OTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSA1150OTA is usually 5 days.

3.What payment methods are accepted for KSA1150OTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSA1150OTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSA1150OTA?

KSA1150OTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSA1150OTA 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 KSA1150OTA?

For technical support, including KSA1150OTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSA1150OTA requirements.

6.How does Aetrix verify that KSA1150OTA is sourced from the original manufacturer or authorized distributors?

All KSA1150OTA 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 KSA1150OTA meets industry standards.

7.What is the process for return or replacement of KSA1150OTA?

All KSA1150OTA units undergo pre-shipment inspection (PSI). If there is an issue with KSA1150OTA, 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 KSA1150OTA part is unused and in its original packaging.

Return procedure for KSA1150OTA:

1.Submit a request within 90 days.

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

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