onsemi 2SC4217E

Overview

2SC4217E from SANYO Semiconductor is an NPN triple diffused planar silicon transistor designed for chroma output and audio output stages in color TV systems. It features VCEO ≥ 300 V, IC = 200 mA (DC), fT = 70 MHz, Cob = 3.5 pF at VCB = 50 V, and TO-126ML micaless package for simplified thermal mounting.

For engineers reviewing the 2SC4217E datasheet, pinout, applications, or equivalent options, key selection criteria include high-voltage switching capability (300 V), low-output capacitance for RF/audio fidelity, DC current gain classification (Rank E: hFE = 100–200), and thermal performance under Tc = 25°C (PC = 10 W).

Technical Context

This transistor employs a triple-diffused planar structure optimized for stable high-voltage amplification in analog video and audio signal paths. Its design supports linear operation with VCE(sat) = 0.6 V at IC = 20 mA / IB = 2 mA and VBE(sat) = 1.0 V under identical conditions.

The device exhibits frequency response suitable for chroma demodulation and mid-power audio output, confirmed by fT = 70 MHz at VCE = 10 V / IC = 10 mA and Cob = 3.5 pF at VCB = 50 V / f = 1 MHz - parameters directly tied to signal integrity in color TV IF and sound output stages.

Key Specifications

Pinout & Package

Package: TO-126ML (micaless, surface-mount compatible with screw or clamp heatsinking). Dimensions per SANYO spec 7516-002: 15.5 × 11.0 × 3.3 mm (L × W × H), with integral metal tab for thermal conduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN high-voltage audio/chroma transistor applications.

Compared with 2SC4217E, the 2SC3854 trades voltage robustness for higher fT, while the 2SC4027 sacrifices power capability and thermal performance for small-outline packaging - neither matches the 2SC4217E's balanced combination of 300 V, 10 W Tc-rated dissipation, and micaless TO-126ML mounting.

Availability

2SC4217E is available at Aetrix Electronics and suitable for color TV repair, legacy AV equipment maintenance, analog video signal chain redesign, and industrial CRT display refurbishment requiring stable component supply and long-lifecycle support.

Supply support for 2SC4217E 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 Semiconductor Co., Ltd. was a Japanese semiconductor manufacturer specializing in analog, power, and consumer electronics ICs and discrete devices before its acquisition by ON Semiconductor in 2013.

The 2SC4217E belongs to SANYO's high-voltage NPN transistor product line engineered specifically for color television chroma and audio output stages, emphasizing reliability under sustained thermal stress and immunity to flyback transients.

FAQ

What is the maximum collector-emitter voltage rating for the 2SC4217E?

The 2SC4217E has a guaranteed minimum collector-to-emitter voltage rating of VCEO ≥ 300 V at Ta = 25°C. This rating is validated under standard test conditions and supports operation in high-voltage color TV chroma output circuits where flyback-induced transients occur. Exceeding this voltage risks junction breakdown, so proper snubbing and layout practices remain essential when using the 2SC4217E in actual designs.

Does the 2SC4217E require a mica insulator when mounted to a heatsink?

No, the 2SC4217E uses a micaless TO-126ML package, meaning its metal tab is electrically isolated internally and can be directly bolted to a grounded heatsink without thermal washers or insulators. This design reduces thermal resistance and simplifies mechanical assembly in mass-produced color TV chassis. Always verify heatsink surface flatness and torque specifications to ensure optimal thermal contact for the 2SC4217E.

What hFE range does the 'E' suffix indicate for the 2SC4217E?

The 'E' suffix in 2SC4217E denotes Rank E, specifying a DC current gain (hFE) range of 100–200 measured at VCE = 10 V and IC = 10 mA. This tighter binning enables predictable biasing in critical analog stages like chroma demodulators, where gain consistency affects color saturation accuracy. The 2SC4217E's Rank E classification is documented in the official SANYO datasheet No. 2968A and applies to every unit marked 2SC4217E.

Can the 2SC4217E be used in place of the 2SC4217 without modification?

Yes - the 2SC4217E is a ranked variant of the base 2SC4217, sharing identical package (TO-126ML), pinout, absolute maximum ratings, and electrical characteristics except for guaranteed hFE range (E = 100–200 vs. unspecified or broader bins in non-suffixed versions). No PCB or schematic changes are needed when substituting 2SC4217E for 2SC4217 in applications where controlled gain is beneficial, such as precision chroma amplifiers.

What is the typical gain-bandwidth product (fT) of the 2SC4217E?

The 2SC4217E has a typical gain-bandwidth product (fT) of 70 MHz, measured at VCE = 10 V and IC = 10 mA. This value ensures sufficient bandwidth for color subcarrier amplification (3.58 MHz NTSC / 4.43 MHz PAL) with margin for harmonics and transient response. The fT is consistent across Rank E units and supports stable operation in tuned IF and video driver stages where phase linearity and group delay matter.