onsemi 2SC4075E

Overview

2SC4075E from SANYO is an NPN triple diffused planar silicon transistor designed for chroma output and audio output stages in color TV systems. It features V_CEO = 300 V, I_C = 200 mA, P_C = 2 W (TO-220ML), f_T = 50 MHz, and h_FE ≥ 40 at I_C = 10 mA, V_CE = 10 V.

For engineers reviewing the 2SC4075E datasheet, pinout, applications, or equivalent options, key selection considerations include high-voltage switching capability, wide ASO (Area of Safe Operation), micaless TO-220ML packaging for thermal reliability in analog video/audio output stages, and DC current gain binning per 10 mA test condition.

Technical Context

This transistor operates as a linear/switching amplifier in high-voltage analog signal paths. Its 300 V V_CEO rating supports CRT-based color TV chroma and sound output circuits, while its 50 MHz f_T enables stable gain up to video frequency bands. The device uses triple diffusion and planar construction for breakdown resistance and reproducible h_FE distribution.

The TO-220ML package provides direct metal tab mounting without mica insulation, improving thermal transfer in compact TV chassis designs. Electrical characteristics are specified at T_a = 25°C with derating curves provided for ambient temperature and collector dissipation.

Key Specifications

Pinout & Package

Package: TO-220ML (micaless, metal tab, 3-lead). Mounting surface is electrically connected to collector (Pin 2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2SC3854 and 2SC4110, the 2SC4075E offers balanced voltage-current-bandwidth trade-offs optimized for mainstream color TV chroma and audio output, with proven ASO behavior under 15.75 kHz horizontal sweep conditions and simplified thermal mounting via micaless TO-220ML.

Availability

2SC4075E is available at Aetrix Electronics and suitable for color TV chroma output, TV audio output, and B/W TV video output applications requiring stable component supply and long-term obsolescence management.

Supply support for 2SC4075E 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 analog and power devices for consumer electronics before its semiconductor business was acquired by ON Semiconductor in 2011.

The 2SC4075E belongs to SANYO's legacy high-voltage bipolar transistor family engineered specifically for CRT television signal chain applications including chroma, luminance, and audio output stages.

FAQ

What is the maximum junction temperature for the 2SC4075E?

The 2SC4075E has a maximum junction temperature (T_j) of 150°C, as specified in its Absolute Maximum Ratings table. This limit must not be exceeded during operation, and thermal design must account for ambient temperature, heatsink efficiency, and duty cycle. Derating curves in the datasheet show that collector dissipation drops linearly to zero at 150°C junction temperature. Proper mounting of the 2SC4075E's metal tab to a heatsink is essential to maintain safe T_j under continuous 200 mA load conditions.

Is the 2SC4075E pin-compatible with other TO-220ML transistors?

The 2SC4075E uses standard TO-220ML pinout (1=Base, 2=Collector/tab, 3=Emitter), matching mechanical and electrical layout of industry-standard TO-220ML devices. However, electrical compatibility depends on voltage/current/frequency specifications - for example, substituting a 200 V transistor may fail under 300 V flyback stress. Always verify V_CEO, I_C, P_C, and ASO curves before replacement. The 2SC4075E itself is not a drop-in replacement for non-micaless variants due to differing thermal interface requirements.

Does the 2SC4075E support Class-A amplifier configurations?

Yes, the 2SC4075E is routinely used in Class-A chroma and audio output stages, where its 2 W power rating and wide ASO allow stable DC-biased operation without secondary breakdown. Designers set quiescent current (typically 20–50 mA) using emitter resistors and ensure junction temperature remains within 150°C under worst-case ambient conditions. The device's h_FE binning supports predictable bias point setting, and its 50 MHz f_T preserves linearity across video bandwidths.

What does "micaless package" mean for the 2SC4075E?

The micaless TO-220ML package of the 2SC4075E means the metal tab (collector) is electrically exposed and intended for direct mounting to a heatsink without insulating mica or silicone pads. This reduces thermal resistance but requires circuit isolation of the heatsink from ground or other potentials. Unlike insulated TO-220 variants, the 2SC4075E's tab is part of the collector node - improper mounting can cause short circuits or safety hazards. PCB layout must ensure no adjacent traces contact the tab area.

How is hFE binned for the 2SC4075E, and why does it matter?

The 2SC4075E is binned by h_FE measured at I_C = 10 mA and V_CE = 10 V, with groups labeled C (40–80), D (80–160), and E (160–320). This allows designers to select matched pairs for push-pull audio outputs or ensure minimum gain in critical chroma amplifiers. The E-grade 2SC4075E guarantees h_FE ≥ 160, enabling lower base drive current and improved efficiency in battery-sensitive or thermally constrained designs - a key factor in legacy TV service and repair scenarios.