STMicroelectronics TEA6425D

Overview

TEA6425D from STMicroelectronics is a 6×8 video cellular matrix switch IC with I²C bus control, designed for CVBS/SVHS signal routing in multi-source AV systems. It supports 6 video inputs and 8 outputs, 15MHz bandwidth, programmable clamp per input, 0.5/6.5dB gain per output, and high-impedance (3-state) outputs enabling parallel connection of up to four devices.

For engineers reviewing the TEA6425D datasheet, TEA6425D pinout, TEA6425D application, or TEA6425D equivalent, key selection criteria include I²C sub-addressing capability (4 addresses), dual Y/C adder integration, -60dB crosstalk at 5MHz, and support for bottom-sync or average-value clamping on each input.

Technical Context

The TEA6425D implements a fully configurable 6×8 analog video switching matrix with two internal selectable Y/C adders for SVHS composite generation. All routing, gain, clamp mode, and output enable states are controlled via standard-mode or fast-mode I²C (up to 400kHz), using a 7-bit slave address plus 2-bit sub-address for multi-device daisy-chaining.

Each input features programmable DC clamp (sync-bottom or average-level), while each output offers independent 0.5dB or 6.5dB gain selection and tri-state capability. The device operates from a single 8V supply (7.2–8.8V), delivers 60mA typical supply current, and maintains ≤60dB crosstalk at 5MHz across all channel combinations.

Key Specifications

Pinout & Package

TEA6425D is housed in a 20-pin plastic micropackage (SO20L), surface-mount compatible with standard reflow profiles. Thermal resistance R_th(j-a) is 80°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar video matrix switching applications.

Compared with MAX4389E and AD8175, the TEA6425D uniquely integrates I²C-configurable clamping, dual Y/C adders, and 4-device addressability - making it purpose-built for cost-sensitive, multi-source CVBS/SVHS consumer electronics rather than generic high-speed or HD video routing.

Availability

TEA6425D is available at Aetrix Electronics and suitable for multi-SCART AV receivers, PIP-enabled TVs, and SVHS-output set-top boxes requiring stable component supply through extended production lifecycles.

Supply support for TEA6425D 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and consumer analog/mixed-signal ICs.

The TEA6425D belongs to ST's legacy video interface product line, engineered specifically for analog video signal management in cost-sensitive consumer AV equipment with emphasis on integration, configurability, and I²C-based system control.

FAQ

What is the maximum number of TEA6425D devices that can be connected on a single I²C bus?

Up to four TEA6425D devices can share one I²C bus using the SUB pin (Pin 7) to select distinct sub-addresses - grounded, 1/3 VCC, 2/3 VCC, or open-circuit correspond to addresses 0x90, 0x96, 0x94, and 0x92 respectively. Each device responds only to its assigned address, enabling coordinated control without bus contention.

Does the TEA6425D require external passive components for basic operation?

Yes - the TEA6425D requires external 220nF AC-coupling capacitors on all six inputs and eight outputs, plus 4.7kΩ pull-up resistors on SDA/SCL lines. A 22µF bulk capacitor on VCC and 10µH/4.7kΩ RC filter on VCCP are also recommended per the typical application circuit to suppress switching noise and ensure stable output bias.

Can the TEA6425D route chroma (C) and luma (Y) signals independently to different outputs?

Yes - the 6×8 matrix allows any input (including dedicated Y or C channels) to be routed to any output. Two internal Y/C adders further allow selected Y and C inputs to be summed and delivered to designated outputs as composite SVHS signals, while other outputs remain available for independent Y or C distribution.

What is the function of the VCCP pin (Pin 20), and why is it separate from VCC (Pin 9)?

VCCP (Pin 20) supplies power exclusively to the output buffer stage, while VCC (Pin 9) powers the logic core and input clamp circuitry. This separation improves PSRR on outputs, reduces crosstalk from digital switching noise, and allows independent filtering - critical for maintaining clean analog video signals when driving multiple 75Ω coaxial loads simultaneously.