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

onsemi KSC2682OS

Name: KSC2682OS
Brand: onsemi
SKU: KSC2682OS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSC2682OS

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-225AA, TO-126-3

Datasheet:: KSC2682OS.pdf

Description:: TRANS NPN 180V 0.1A TO-126-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSC2682OS from ON Semiconductor (formerly Fairchild) is an NPN epitaxial silicon transistor designed for audio frequency power amplification, with V_CEO = 180 V, I_C = 100 mA, P_C = 8 W at T_C = 25°C, f_T = 200 MHz, and h_FE = 100–200 (Class O), used in linear amplifier stages of consumer audio equipment.

For engineers reviewing the KSC2682OS datasheet, pinout, applications, or equivalent options, key selection criteria include safe operating area (SOA) compliance at 100 mA/180 V, low V_CE(sat) ≤ 0.5 V at I_C = 50 mA/I_B = 5 mA, noise figure of 4 dB at 1 kHz, TO-126 thermal performance, and complementary pairing with KSA1142 for push-pull output stages.

Technical Context

The KSC2682OS operates as a medium-voltage, medium-current linear amplifier transistor with DC current gain h_FE specified across two test points: 90–190 at I_C = 1 mA and 100–200 at I_C = 10 mA. Its 200 MHz f_T supports stable audio bandwidth extension beyond 20 kHz while maintaining low distortion under Class A/B biasing.

Thermal design relies on its TO-126 package's 8 W collector dissipation at case temperature T_C = 25°C, derated linearly above 25°C per Figure 8, and its SOA curve (Figure 6) defines second breakdown limits up to 10 ms pulse width-critical for transient handling in speaker driver circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	180 V - Supports rail voltages up to ±90 V in complementary push-pull amplifier configurations without breakdown.
I_C	100 mA - Rated continuous collector current enabling 1–2 W audio output into 4–8 Ω loads with appropriate heat sinking.
f_T	200 MHz - Ensures flat small-signal gain response across full audio band (20 Hz–20 kHz) with margin for stability compensation.
V_CE(sat)	≤ 0.5 V @ I_C=50 mA, I_B=5 mA - Minimizes conduction loss and thermal stress in linear output stage operation.
h_FE (Class O)	100–200 - Tight DC gain distribution simplifies bias network design and improves matching in dual-transistor amplifier topologies.
NF	4 dB @ 1 kHz, R_S=10 kΩ - Low noise performance suitable for pre-driver and voltage amplification stages preceding power output devices.
C_ob	3.2–5.0 pF @ V_CB=10 V - Limits high-frequency feedback and aids stability in multi-stage amplifier designs.

Pinout & Package

Package: TO-126 - Three-lead, through-hole, thermally enhanced plastic package with metal tab electrically connected to collector; requires mechanical mounting to heatsink for rated 8 W dissipation.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Connected to ground or emitter resistor; polarity defines NPN operation and bias direction.
2 (Collector)	Current source terminal	Electrically tied to metal tab; must be isolated from heatsink unless heatsink is grounded or collector-referenced.
3 (Base)	Control input terminal	Receives drive current to modulate collector-emitter conduction; requires current-limiting resistor in series with driver stage.

Key Features

Feature	Design Value
Complementary pair with KSA1142	Enables matched push-pull output stages with symmetrical V_CEO, I_C, and h_FE ranges for reduced crossover distortion.
Low V_CE(sat) (0.12–0.5 V)	Reduces quiescent power loss and improves thermal efficiency in Class AB amplifier biasing schemes.
High f_T (200 MHz)	Supports wideband audio fidelity and stable frequency response when combined with standard compensation networks.
SOA-rated for 10 ms pulses	Withstands short-term overload transients common in loudspeaker protection and clipping scenarios.
TO-126 thermal capability (8 W @ T_C=25°C)	Permits compact heatsinking in space-constrained audio chassis while maintaining reliability under sustained load.

Applications

Audio Power Amplifier Output Stage	DC Motor Driver (Low-Power)
Use Scenario: Final push-pull output pair in 1–3 W stereo amplifier modules for portable speakers and instrument preamps. IC Role / Device Role / Timing Role: Linear NPN power transistor delivering amplified audio signal to 4–8 Ω speaker load with minimal harmonic distortion. Use Value: V_CEO = 180 V and SOA compliance enable safe operation with ±60 V rails; h_FE consistency ensures matched gain with complementary KSA1142.	Use Scenario: H-bridge half-bridge switch in battery-powered toy motors or small actuator drivers (≤12 V, ≤100 mA). IC Role / Device Role / Timing Role: Medium-voltage switching transistor controlling motor direction and speed via PWM base drive. Use Value: Low V_CE(sat) reduces I²R losses during conduction; TO-126 tab allows direct heatsink attachment for intermittent duty-cycle operation.
Signal Generator Buffer Stage	Test Equipment Bias Reference
Use Scenario: Unity-gain buffer between oscillator core and output attenuator in benchtop function generators (20 Hz–200 kHz). IC Role / Device Role / Timing Role: High-fidelity voltage follower providing low-output-impedance drive without loading sensitive LC tank or crystal oscillator circuits. Use Value: 200 MHz f_T and 4 dB NF ensure minimal phase shift and added noise across full audio spectrum.	Use Scenario: Stable current source element in precision op-amp bias networks and reference voltage generators for calibration-grade instruments. IC Role / Device Role / Timing Role: Active current mirror component establishing accurate, temperature-stable bias currents for analog front-ends. Use Value: Tight h_FE tolerance (100–200) and low I_CBO (≤1 µA) minimize drift and mismatch in matched transistor pairs.

Audio Power Amplifier Output Stage

DC Motor Driver (Low-Power)

Use Scenario: Final push-pull output pair in 1–3 W stereo amplifier modules for portable speakers and instrument preamps.

IC Role / Device Role / Timing Role: Linear NPN power transistor delivering amplified audio signal to 4–8 Ω speaker load with minimal harmonic distortion.

Use Value: V_CEO = 180 V and SOA compliance enable safe operation with ±60 V rails; h_FE consistency ensures matched gain with complementary KSA1142.

Use Scenario: H-bridge half-bridge switch in battery-powered toy motors or small actuator drivers (≤12 V, ≤100 mA).

IC Role / Device Role / Timing Role: Medium-voltage switching transistor controlling motor direction and speed via PWM base drive.

Use Value: Low V_CE(sat) reduces I²R losses during conduction; TO-126 tab allows direct heatsink attachment for intermittent duty-cycle operation.

Signal Generator Buffer Stage

Test Equipment Bias Reference

Use Scenario: Unity-gain buffer between oscillator core and output attenuator in benchtop function generators (20 Hz–200 kHz).

IC Role / Device Role / Timing Role: High-fidelity voltage follower providing low-output-impedance drive without loading sensitive LC tank or crystal oscillator circuits.

Use Value: 200 MHz f_T and 4 dB NF ensure minimal phase shift and added noise across full audio spectrum.

Use Scenario: Stable current source element in precision op-amp bias networks and reference voltage generators for calibration-grade instruments.

IC Role / Device Role / Timing Role: Active current mirror component establishing accurate, temperature-stable bias currents for analog front-ends.

Use Value: Tight h_FE tolerance (100–200) and low I_CBO (≤1 µA) minimize drift and mismatch in matched transistor pairs.

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
MJD2955G	Higher P_C (15 W), lower f_T (100 kHz), TO-220 package, complementary to MJE2955G	Better thermal headroom but limited high-frequency linearity; suited for higher-power, lower-bandwidth amplifiers	Select when >5 W output or PCB-mount heatsinking is required; not drop-in due to TO-220 footprint and pinout.
KSC2383Y	Same TO-126 package, V_CEO = 160 V, h_FE = 160–320 (Class Y), f_T = 100 MHz	Higher gain but lower voltage rating and bandwidth; less suitable for ±80 V rail designs	Acceptable for cost-sensitive, lower-voltage audio stages where tighter h_FE spread is not critical.

Compared with KSC2682OS, MJD2955G offers greater power handling but sacrifices audio bandwidth, while KSC2383Y retains TO-126 compatibility but trades voltage margin and f_T for higher h_FE-making KSC2682OS optimal for balanced 1–3 W audio output with SOA integrity and wideband fidelity.

Availability

KSC2682OS is available at Aetrix Electronics and suitable for audio power amplifiers, low-power motor control circuits, signal generator buffer stages, and precision bias reference designs requiring stable component supply and long-lifecycle support.

Supply support for KSC2682OS 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 semiconductor supplier focused on energy-efficient electronics, automotive systems, and industrial power management solutions.

The KSC2682OS belongs to Fairchild's legacy discrete bipolar transistor family, engineered specifically for high-fidelity, medium-power linear amplification in consumer and professional audio equipment.

FAQ

What is the maximum collector-emitter voltage rating for KSC2682OS?

The KSC2682OS has a maximum collector-emitter voltage (V_CEO) rating of 180 V at T_C = 25°C. This rating applies under DC or pulse conditions with proper heatsinking and within the device's safe operating area (SOA) limits. Exceeding this voltage risks avalanche breakdown and permanent damage to the KSC2682OS junction.

Is KSC2682OS pin-compatible with KSA1142?

No, KSC2682OS is not pin-compatible with KSA1142. While they are complementary NPN/PNP pairs intended for push-pull amplifier use, KSC2682OS (NPN) and KSA1142 (PNP) have opposite pinouts: KSC2682OS is E-C-B (pin 1–2–3), whereas KSA1142 is E-B-C. Layouts must account for reversed base/collector connections when using both in the same circuit.

What is the typical noise figure of KSC2682OS and under what conditions is it measured?

The KSC2682OS has a typical noise figure (NF) of 4 dB, measured at V_CE = 10 V, I_C = 1 mA, R_S = 10 kΩ, and f = 1 kHz. This low-noise performance makes the KSC2682OS suitable for voltage amplification and pre-driver stages where signal integrity and minimal added noise are critical.

Can KSC2682OS be used in switching applications?

Yes, the KSC2682OS can be used in low-frequency switching applications such as DC motor control or relay driving, provided switching speeds remain below ~100 kHz. Its 200 MHz f_T and low V_CE(sat) support efficient on/off operation, but it is optimized for linear amplification-not high-speed digital switching-so gate/base drive design must prioritize saturation and thermal management for the KSC2682OS.

What is the thermal resistance (R_θJC) of KSC2682OS in its TO-126 package?

The KSC2682OS does not specify R_θJC explicitly in its datasheet, but its rated collector dissipation of 8 W at T_C = 25°C implies an effective R_θJC ≈ 15.6°C/W (calculated as (T_J − T_C) / P_C = (150 − 25) / 8). Actual thermal performance depends on heatsink interface quality and mounting pressure, and users should verify junction temperature under operating conditions for the KSC2682OS.

KSC2682OS Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-225AA, TO-126-3

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 180 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 5mA, 50mA

Current - Collector Cutoff (Max):: 1µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 10mA, 5V

Power - Max:: 1.2 W

Frequency - Transition:: 200MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-126-3

KSC2682OS FAQ

1.How can I place an order for KSC2682OS through Aetrix?

Please submit a Request for Quotation (RFQ) for KSC2682OS 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 KSC2682OS reliable?

The price and inventory of KSC2682OS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSC2682OS is usually 5 days.

3.What payment methods are accepted for KSC2682OS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSC2682OS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSC2682OS?

KSC2682OS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSC2682OS 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 KSC2682OS?

For technical support, including KSC2682OS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSC2682OS requirements.

6.How does Aetrix verify that KSC2682OS is sourced from the original manufacturer or authorized distributors?

All KSC2682OS 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 KSC2682OS meets industry standards.

7.What is the process for return or replacement of KSC2682OS?

All KSC2682OS units undergo pre-shipment inspection (PSI). If there is an issue with KSC2682OS, 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 KSC2682OS part is unused and in its original packaging.

Return procedure for KSC2682OS:

1.Submit a request within 90 days.

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

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