onsemi 2SC4636LS

Overview

2SC4636LS from SANYO is an NPN triple diffused planar silicon transistor designed for high-voltage amplifier and switching applications, featuring VCEO = 1800 V, IC = 10 mA, Cob = 1.4 pF (typ), fT = 6 MHz, and full-isolation TO-220FI(LS) packaging. It operates in high-reliability industrial HV power supplies and CRT flyback drivers.

For engineers reviewing the 2SC4636LS datasheet, pinout, applications, or equivalent options, key selection criteria include breakdown voltage margin, output capacitance impact on switching speed, thermal resistance (Rthj-c = 12.5°C/W), and isolation integrity in grounded-emitter HV topologies.

Technical Context

This device uses SANYO's HVP (High-Voltage Process) to achieve robust 1800 V collector-emitter blocking capability while maintaining low output capacitance (Cob = 1.4 pF at VCB = 100 V). Its planar triple-diffused structure ensures stable hFE (10–60) across IC = 100 µA and supports linear amplification up to 6 MHz fT.

The TO-220FI(LS) package provides full electrical isolation between collector (case) and internal die, enabling direct mounting to heatsinks without insulating washers. Thermal performance is rated at Rthj-c = 12.5°C/W with no heatsink, supporting continuous 2 W dissipation at Tc = 25°C.

Key Specifications

Pinout & Package

2SC4636LS is housed in a full-isolation TO-220FI(LS) package with metal tab electrically isolated from the collector. The case serves as the collector terminal, enabling safe heatsink mounting without insulation hardware.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2SC4636 and BU508A, the 2SC4636LS uniquely combines certified 1800 V blocking, sub-2 pF Cob, and full isolation-making it irreplaceable in space-constrained, grounded-heatsink HV amplifier designs where leakage, timing fidelity, and safety certification matter.

Availability

2SC4636LS is available at Aetrix Electronics and suitable for industrial HV power supplies, CRT flyback drivers, laser diode pulse drivers, and capacitor charging circuits requiring stable component supply and long-lifecycle support.

Supply support for 2SC4636LS 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

SANYO Electric Co., Ltd. was a Japanese semiconductor manufacturer specializing in high-reliability discrete devices, particularly for consumer, industrial, and display applications before its acquisition by ON Semiconductor in 2011.

The 2SC4636LS belongs to SANYO's high-voltage transistor product line, engineered specifically for CRT deflection, HV power conversion, and precision pulse switching where isolation, voltage margin, and low parasitic capacitance are critical.

FAQ

What is the maximum collector-emitter voltage rating for the 2SC4636LS?

The 2SC4636LS has a guaranteed minimum collector-to-emitter breakdown voltage V(BR)CEO of 1800 V at IC = 100 µA with RBE = ∞. This rating is validated per SANYO's absolute maximum ratings table and supports reliable operation in circuits with DC bus voltages up to 1500 V with appropriate safety margin. The 2SC4636LS must not be operated beyond this limit even momentarily.

Does the 2SC4636LS require an insulating pad when mounted to a heatsink?

No, the 2SC4636LS uses a TO-220FI(LS) package with full electrical isolation between the collector (metal tab) and the internal die. This allows direct mounting to a grounded heatsink without thermal interface pads or mica insulators. The 2SC4636LS maintains isolation integrity up to its rated voltage, eliminating risk of shorting through the heatsink.

What is the typical output capacitance (Cob) of the 2SC4636LS and how does it affect switching performance?

The 2SC4636LS has a typical output capacitance Cob of 1.4 pF measured at VCB = 100 V and f = 1 MHz. This low value reduces Miller feedback during switching transitions, enabling faster turn-off and lower switching losses in high-voltage pulse applications. In flyback or capacitor-charging circuits, this directly improves pulse edge sharpness and timing accuracy compared to higher-Cob alternatives.

Can the 2SC4636LS be used in linear amplifier configurations?

Yes, the 2SC4636LS supports linear operation with DC current gain hFE ranging from 10 to 60 at VCE = 5 V and IC = 100 µA. Its 6 MHz fT and low Cob make it suitable for high-voltage, low-current signal amplification stages-such as CRT grid drivers or HV sensor interfaces-provided junction temperature remains within 150°C and derating rules for PC = 2 W are observed.

What is the thermal resistance from junction to case (Rthj-c) for the 2SC4636LS?

The 2SC4636LS has a specified thermal resistance Rthj-c of 12.5°C/W from junction to case under standard test conditions (Tc = 25°C, no heatsink). This value enables calculation of maximum allowable power dissipation based on case temperature, and confirms that the 2SC4636LS can safely dissipate its full 2 W rating when the case is maintained at or below 25°C-critical for sealed or convection-cooled HV module designs.