onsemi KSC2335Y

Overview

KSC2335Y from Fairchild Semiconductor is an NPN epitaxial silicon power transistor designed for high-voltage, high-speed switching in industrial applications. It features a 400 V V_CEO, 7 A DC collector current, 40 W collector dissipation at T_C=25°C, 1.2 V V_BE(sat) at I_C=3 A/I_B=0.6 A, and TO-220 package with pinout Base–Collector–Emitter.

For engineers reviewing the KSC2335Y datasheet, pinout, applications, or equivalent options, key selection criteria include sustaining voltage under inductive switching (V_CEX(sus)1 = 450 V), fast switching performance (t_ON = 1 µs, t_F = 1 µs), and h_FE classification Y (40–80 at I_C = 1 A).

Technical Context

The KSC2335Y operates as a rugged, high-voltage NPN switch optimized for inductive load control. Its design supports clamped inductive turn-off with V_CEX(sus)1 = 450 V at I_C = 3 A, I_B1 = –I_B2 = 0.6 A, V_BE(off) = –5 V, and L = 180 µH.

It delivers low saturation losses (V_CE(sat) = 1 V, V_BE(sat) = 1.2 V at I_C = 3 A/I_B = 0.6 A) and fast transient response (t_STG = 2.5 µs), enabling efficient operation in hard-switched industrial SMPS and motor drive snubber circuits.

Key Specifications

Pinout & Package

Package: TO-220 (3-lead, straight lead, insulated tab). Dimensions per Fairchild Rev. A1: 15.90 mm × 10.08 mm × 18.95 mm max, mounting hole ø3.60 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STN1210 and MJE13009, the KSC2335Y offers balanced 400 V/7 A capability with tight Y-class h_FE (40–80) and proven clamped inductive ruggedness - making it optimal for mid-power industrial SMPS where predictable drive and snubberless operation are prioritized.

Availability

KSC2335Y is available at Aetrix Electronics and suitable for industrial motor drives, induction heating inverters, and switch-mode power supplies requiring stable component supply and long-term manufacturability.

Supply support for KSC2335Y 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 discrete and analog ICs, acquired by ON Semiconductor in 2016. Its legacy power transistors remain widely deployed in industrial systems.

The KSC2335Y belongs to Fairchild's high-voltage NPN switching transistor family, engineered for rugged, snubberless operation in 20–100 kHz industrial power conversion and inductive load control.

FAQ

What is the guaranteed h_FE range for KSC2335Y?

The KSC2335Y is Y-class binned with h_FE = 40–80 measured at V_CE = 5 V and I_C = 1 A. This tight gain range ensures consistent base drive requirements across production units, simplifying gate/base driver design for industrial switching applications using the KSC2335Y.

Does KSC2335Y support clamped inductive switching?

Yes, the KSC2335Y is specifically characterized for clamped inductive turn-off, with V_CEX(sus)1 = 450 V at I_C = 3 A, I_B1 = –I_B2 = 0.6 A, V_BE(off) = –5 V, and L = 180 µH. This specification confirms its suitability for snubberless flyback and resonant converter topologies relying on active clamping, a core capability of the KSC2335Y.

What is the maximum continuous collector current for KSC2335Y?

The KSC2335Y has a rated DC collector current (I_C) of 7 A at T_A = 25°C. Derating applies above 25°C ambient; the device achieves 40 W collector dissipation only when case temperature (T_C) is held at 25°C - confirming its use with heatsinking in sustained high-current applications such as motor drive outputs and SMPS primaries.

Is KSC2335Y pin-compatible with other TO-220 NPN transistors?

The KSC2335Y uses standard TO-220 pinout: Pin 1 = Base, Pin 2 = Collector, Pin 3 = Emitter. While physically compatible with other 3-lead TO-220 packages, electrical compatibility depends on voltage/current/SOA specifications - e.g., MJE13009 shares the same pinout but differs in h_FE range and peak current, requiring validation before substitution in existing KSC2335Y designs.

What is the typical V_CE(sat) of KSC2335Y under rated conditions?

The KSC2335Y exhibits V_CE(sat) = 1 V maximum at I_C = 3 A and I_B = 0.6 A. This low saturation voltage reduces conduction loss and improves thermal efficiency in hard-switched applications - a verified parameter from Fairchild's June 2001 datasheet that defines real-world performance of the KSC2335Y in production systems.