onsemi KSC2310OBU

Overview

KSC2310OBU from Fairchild Semiconductor is an NPN epitaxial silicon transistor designed for high-voltage power amplifier applications, featuring VCBO = 200 V, VCEO = 150 V, IC = 50 mA, fT = 100 MHz, and TO-92L package. It operates reliably in audio output stages and switching regulators where moderate current gain and high breakdown voltage are required.

For engineers reviewing the KSC2310OBU datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain classification (O: hFE = 70–140), collector-emitter saturation voltage (VCE(sat) = 0.5 V at IC = 10 mA/IB = 1 mA), and safe operating area under pulsed conditions.

Technical Context

This NPN bipolar junction transistor uses epitaxial base construction to support stable high-voltage operation up to 200 V collector-base and 150 V collector-emitter. Its 100 MHz fT enables use in RF driver and broadband amplifier stages up to VHF frequencies.

The device exhibits low output capacitance (Cob = 3.5–5 pF at VCB = 10 V), enabling fast switching transitions, and maintains hFE linearity across IC = 0.1–100 mA with VCE = 5 V, supporting consistent gain in linear amplification circuits.

Key Specifications

Pinout & Package

Package: TO-92L - leaded plastic package with 2.54 mm lead pitch, 4.90 mm body length, and 3.90 mm width, optimized for through-hole mounting and manual rework.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN high-voltage amplifier applications.

Compared with MPSA42 and KSC1845FTA, the KSC2310OBU offers optimal balance of 150 V VCEO, 100 MHz fT, and O-class hFE binning for cost-sensitive audio and mid-frequency switching designs where pin compatibility and thermal performance in TO-92L are critical.

Availability

KSC2310OBU is available at Aetrix Electronics and suitable for audio power amplifier stages, offline switching regulators, DC motor drivers, and logic level shifters requiring stable component supply and long-term industrial availability.

Supply support for KSC2310OBU 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete devices before its acquisition by ON Semiconductor in 2016.

The KSC2310OBU belongs to Fairchild's legacy high-voltage NPN transistor family, engineered for robustness in consumer audio, industrial control, and AC/DC power conversion applications.

FAQ

What is the hFE classification for KSC2310OBU?

The "O" suffix in KSC2310OBU denotes the hFE bin: 70–140 at VCE = 5 V and IC = 10 mA. This classification ensures predictable DC current gain for bias-critical amplifier and switching circuits, distinguishing it from R-class (40–80) and Y-class (120–240) variants of the same die. The KSC2310OBU maintains this gain range across temperature from −55°C to +125°C.

What is the maximum continuous collector current for KSC2310OBU?

The KSC2310OBU has a rated continuous collector current (IC) of 50 mA at Ta = 25°C. Derating is required above 25°C per the power dissipation curve: PC drops linearly from 800 mW at 25°C to 0 W at 150°C junction temperature. At 70°C ambient, maximum IC is ~35 mA with proper PCB copper area for heat spreading.

Is KSC2310OBU compatible with standard TO-92 footprints?

No - KSC2310OBU uses the TO-92L package, which shares pin count and lead material with TO-92 but features longer leads (8.00 mm vs 4.5 mm) and tighter dimensional tolerances. Its 4.90 mm body length and 2.54 mm lead pitch match JEDEC TO-92L standards, not generic TO-92. Using KSC2310OBU in a standard TO-92 footprint may cause solder joint stress or misalignment.

What is the typical Cob value for KSC2310OBU and how does it affect circuit design?

The KSC2310OBU has a specified Cob of 3.5–5 pF at VCB = 10 V and f = 1 MHz. This low output capacitance limits Miller feedback in common-emitter amplifiers, enabling stable gain up to 30 MHz. In switching applications, it reduces turn-off delay and gate drive losses when used with resistive base drive, making the KSC2310OBU suitable for 100 kHz–1 MHz PWM stages.

Can KSC2310OBU be used in avalanche mode?

No - the KSC2310OBU is not rated or characterized for avalanche operation. Its absolute maximum ratings define safe linear and switching operation only within the SOA curve shown in Figure 5 of the datasheet. Exceeding BVCEO = 150 V in reverse-biased collector-emitter configuration risks irreversible junction damage. For avalanche-tolerant designs, discrete avalanche-rated transistors such as the FMMT417 should be selected instead of the KSC2310OBU.