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

onsemi KSA708CYTA

Name: KSA708CYTA
Brand: onsemi
SKU: KSA708CYTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSA708CYTA

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: KSA708CYTA.pdf

Description:: TRANS PNP 60V 0.7A TO-92-3

Quantity:: RFQ Add To RFQ list

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Inventory:9,015

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Product details

Overview

KSA708CYTA from onsemi is a PNP epitaxial silicon transistor designed for low-frequency amplification and medium-speed switching applications, with −80 V collector–base voltage, −700 mA collector current rating, and 800 mW power dissipation in TO-92 3 LF package. It serves as a complement to the KSC1008 NPN device in push–pull amplifier stages and relay driver circuits.

For engineers reviewing the KSA708CYTA datasheet, pinout, applications, or equivalent options, key selection considerations include its PNP polarity, TO-92 leadform (Emitter–Base–Collector), DC current gain range of 120–240 at −50 mA, saturation voltage under −500 mA load, and −60 V V_CEO rating for reliable operation in industrial control interfaces.

Technical Context

This discrete PNP bipolar junction transistor operates in linear amplification and saturated switching modes. Its f_T of 50 MHz supports medium-speed digital signal routing, while Cob of 13 pF at −10 V V_CB enables stable performance in audio preamplifier input stages and low-noise sensor interface buffers.

The device uses a center-collector configuration (suffix "C") with pinout E–B–C (pin 1–2–3), matching TO-92 3 LF mechanical outline CASE 135AR. Absolute maximum ratings are defined at T_A = 25 °C, with junction temperature limit of 150 °C and storage range from −55 to +150 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CBO	−80 V: Maximum reverse bias between collector and base before breakdown; defines safe operating voltage in high-side switch configurations.
I_C	−700 mA: Continuous collector current capability; supports relay coil driving and LED array switching without forced cooling.
P_C	800 mW: Power dissipation limit at 25 °C ambient; requires thermal derating above 25 °C per datasheet curve.
h_FE	120–240: DC current gain at V_CE = −2 V, I_C = −50 mA; ensures predictable base drive sizing in linear amplifier designs.
V_CE(sat)	≤ −0.7 V at I_C = −500 mA, I_B = −50 mA: Low saturation voltage minimizes conduction loss in switching applications.
f_T	50 MHz: Current gain–bandwidth product; suitable for audio-band amplifiers and sub-MHz digital logic interfacing.

Pinout & Package

Package: TO-92 3 LF (Pb-free), CASE 135AR, dimensions 4.83 mm × 4.76 mm, leadformed, center-collector variant (suffix "C").

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current source terminal for PNP device	Connected to higher potential rail in common-emitter switching; polarity must be observed to avoid reverse-bias damage.
2 (Base)	Control electrode for minority-carrier injection	Requires negative base current relative to emitter to turn on; typical drive is −50 mA for full saturation at −500 mA load.
3 (Collector)	Current sink terminal	Center-collector configuration (KSA708C) places collector centrally for thermal and layout symmetry in complementary pair layouts.

Key Features

Feature	Design Value
Complementary pairing	Explicitly designed as PNP counterpart to KSC1008 NPN, enabling matched push–pull output stages with consistent gain and thermal tracking.
Medium-speed switching	f_T = 50 MHz and V_CE(sat) ≤ −0.7 V support clean edge transitions in 100 kHz–500 kHz switching nodes like PWM motor drivers.
Low leakage	I_CBO ≤ −0.1 µA at V_CB = −60 V ensures minimal standby current in battery-powered sensor front-ends.
Pb-free packaging	TO-92 3 LF (CASE 135AR) meets RoHS Directive 2011/65/EU; compatible with lead-free reflow profiles up to 260 °C peak.

Applications

Audio Preamp Stage	Relay Driver Circuit
Use Scenario: Low-noise voltage amplification of microphone or line-level signals in consumer audio equipment. IC Role / Device Role / Timing Role: PNP BJT configured in common-emitter topology to provide inverted gain with low input capacitance (Cob = 13 pF). Use Value: h_FE range of 120–240 ensures stable bias point across temperature; V_CEO = −60 V accommodates ±24 V supply rails.	Use Scenario: Driving electromagnetic relays in PLC I/O modules requiring robust current sinking capability. IC Role / Device Role / Timing Role: Saturated PNP switch controlling relay coil current up to −500 mA with minimal V_CE(sat). Use Value: V_CE(sat) ≤ −0.7 V reduces power loss in coil path; I_C = −700 mA headroom prevents thermal runaway during surge events.
Industrial Sensor Interface	Complementary Amplifier Pair
Use Scenario: Level-shifting and buffering analog outputs from pressure or temperature transducers in harsh environments. IC Role / Device Role / Timing Role: Emitter-follower buffer providing high input impedance and low output impedance for signal conditioning. Use Value: V_EBO = −8 V allows safe connection to −5 V reference rails; T_J = 150 °C rating supports operation near heat-generating components.	Use Scenario: Push–pull output stage in Class-B audio amplifiers or DC motor H-bridge predrivers. IC Role / Device Role / Timing Role: PNP half of matched KSA708C/KSC1008 pair delivering symmetrical sourcing/sinking capability. Use Value: Complementarity ensures balanced crossover distortion; identical TO-92 footprint simplifies PCB layout and thermal management.

Audio Preamp Stage

Relay Driver Circuit

Use Scenario: Low-noise voltage amplification of microphone or line-level signals in consumer audio equipment.

IC Role / Device Role / Timing Role: PNP BJT configured in common-emitter topology to provide inverted gain with low input capacitance (Cob = 13 pF).

Use Value: h_FE range of 120–240 ensures stable bias point across temperature; V_CEO = −60 V accommodates ±24 V supply rails.

Use Scenario: Driving electromagnetic relays in PLC I/O modules requiring robust current sinking capability.

IC Role / Device Role / Timing Role: Saturated PNP switch controlling relay coil current up to −500 mA with minimal V_CE(sat).

Use Value: V_CE(sat) ≤ −0.7 V reduces power loss in coil path; I_C = −700 mA headroom prevents thermal runaway during surge events.

Industrial Sensor Interface

Complementary Amplifier Pair

Use Scenario: Level-shifting and buffering analog outputs from pressure or temperature transducers in harsh environments.

IC Role / Device Role / Timing Role: Emitter-follower buffer providing high input impedance and low output impedance for signal conditioning.

Use Value: V_EBO = −8 V allows safe connection to −5 V reference rails; T_J = 150 °C rating supports operation near heat-generating components.

Use Scenario: Push–pull output stage in Class-B audio amplifiers or DC motor H-bridge predrivers.

IC Role / Device Role / Timing Role: PNP half of matched KSA708C/KSC1008 pair delivering symmetrical sourcing/sinking capability.

Use Value: Complementarity ensures balanced crossover distortion; identical TO-92 footprint simplifies PCB layout and thermal management.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP bipolar transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
KSA992FBU	Higher V_CBO (−120 V), lower h_FE (60–120), same TO-92 package	Better suited for higher-voltage industrial switching where −80 V margin is insufficient	Select when system requires >−100 V blocking capability and can tolerate reduced current gain.
MPSA92	Same V_CBO (−300 V), higher V_CEO (−300 V), h_FE 25–200, TO-92	Superior voltage ruggedness for flyback snubbers and HV bias supplies	Choose for applications demanding extreme V_CEO margin, accepting wider h_FE spread and higher V_CE(sat).

Compared with KSA992FBU and MPSA92, the KSA708CYTA offers tighter h_FE tolerance (120–240) and optimized V_CE(sat) for medium-current switching, making it preferable in cost-sensitive audio and relay control where −60 V V_CEO suffices.

Availability

KSA708CYTA is available at Aetrix Electronics and suitable for audio preamplifiers, relay driver circuits, and industrial sensor interfaces requiring stable component supply and RoHS-compliant packaging.

Supply support for KSA708CYTA 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 innovation for automotive, industrial, cloud, and IoT applications.

The KSA708CYTA belongs to onsemi's general-purpose bipolar transistor product line, engineered for reliability in low-frequency analog amplification and medium-speed discrete switching across industrial and consumer systems.

FAQ

What is the pinout configuration of the KSA708CYTA?

The KSA708CYTA uses a TO-92 3 LF package with center-collector pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. This configuration is confirmed in the official onsemi datasheet (Publication Order Number KSA708/D, Rev. 4) and matches CASE 135AR mechanical outline. The "C" suffix explicitly denotes center-collector orientation, critical for complementary pair layout with KSC1008.

Is the KSA708CYTA still in active production?

No - the KSA708CYTA is officially discontinued per onsemi's January 2026 revision 4 datasheet, which states "DISCONTINUED" in the Ordering Information table and notes "This device is not available." However, Aetrix Electronics maintains legacy inventory and provides lifecycle coordination support for existing designs dependent on the KSA708CYTA.

What is the maximum collector current rating for the KSA708CYTA?

The KSA708CYTA has an absolute maximum collector current rating of −700 mA at T_A = 25 °C, as specified in the Absolute Maximum Ratings table. Derating is required above 25 °C ambient per the datasheet's thermal curve; continuous operation at −700 mA requires adequate PCB copper area or heatsinking to maintain junction temperature ≤150 °C.

How does the KSA708CYTA compare to the KSA708YTA?

The KSA708CYTA and KSA708YTA share identical electrical specifications and TO-92 3 LF packaging, but differ in internal construction: the "C" suffix indicates center-collector leadframe (pin 3), whereas "Y" denotes standard leadform (pin 2 = collector). This physical difference affects PCB layout compatibility - KSA708CYTA cannot substitute for KSA708YTA without board revision due to reversed collector/base pin positions.

What is the typical DC current gain (h_FE) of the KSA708CYTA?

The KSA708CYTA exhibits a DC current gain (h_FE) ranging from 120 to 240 when measured at V_CE = −2 V and I_C = −50 mA, per the Electrical Characteristics table. This gain window enables predictable base resistor calculation for linear amplifiers and ensures sufficient drive margin for saturated switching at −500 mA collector current.

KSA708CYTA 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:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 700 mA

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

Vce Saturation (Max) @ Ib, Ic:: 700mV @ 50mA, 500mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 120 @ 500mA, 2V

Power - Max:: 800 mW

Frequency - Transition:: 50MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

KSA708CYTA FAQ

1.How can I place an order for KSA708CYTA through Aetrix?

Please submit a Request for Quotation (RFQ) for KSA708CYTA 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 KSA708CYTA reliable?

The price and inventory of KSA708CYTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSA708CYTA is usually 5 days.

3.What payment methods are accepted for KSA708CYTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSA708CYTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSA708CYTA?

KSA708CYTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSA708CYTA 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 KSA708CYTA?

For technical support, including KSA708CYTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSA708CYTA requirements.

6.How does Aetrix verify that KSA708CYTA is sourced from the original manufacturer or authorized distributors?

All KSA708CYTA 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 KSA708CYTA meets industry standards.

7.What is the process for return or replacement of KSA708CYTA?

All KSA708CYTA units undergo pre-shipment inspection (PSI). If there is an issue with KSA708CYTA, 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 KSA708CYTA part is unused and in its original packaging.

Return procedure for KSA708CYTA:

1.Submit a request within 90 days.

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

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