Microchip Technology SMDA05C-7/TR7

Overview

SMDA05C-7/TR7 from Diodes Incorporated is a bidirectional transient voltage suppressor (TVS) array in SO-8 package, rated for 300 W peak pulse power (8/20 µs), 5.0 V standoff voltage (V_WM), and clamping voltage of 9.8 V at 1 A. It protects up to 7 I/O lines in ESD-sensitive digital interfaces such as USB, RS-485, and parallel bus transceivers.

For engineers reviewing the SMDA05C-7/TR7 datasheet, SMDA05C-7/TR7 pinout, SMDA05C-7/TR7 application, or SMDA05C-7/TR7 equivalent, key selection criteria include IEC 61000-4-2 (±15 kV contact/±20 kV air) compliance, low 40 µA leakage at 5.0 V, 200 pF line capacitance at 1 MHz, and operation across –55 °C to +150 °C ambient.

Technical Context

This TVS array uses silicon avalanche diode technology to provide fast-response clamping (<1 ns typical response time) for electrostatic discharge and electrical fast transients. Each of its seven channels operates bidirectionally with symmetrical breakdown (6.0 V min / 7.0 V max V_BR), enabling protection of AC-coupled or differential signal paths without polarity constraints.

The device integrates all seven TVS elements into a single SO-8 package with common cathode configuration per channel pair, supporting board-level surge suppression without discrete placement overhead. Its thermal design sustains repeated 300 W pulses at <0.01% duty cycle while maintaining stable V_WM over full temperature range.

Key Specifications

Pinout & Package

SO-8 surface-mount package (JEDEC MS-012AC), 4.9 mm × 6.0 mm footprint, 1.75 mm max height, 0.050″ pitch, pin #1 marked by dot on top surface. Weight: 0.066 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with SMAJ5.0A and SP1003-050, the SMDA05C-7/TR7 delivers optimal balance of 7-line integration, 9.8 V clamping headroom, and 200 pF bandwidth-making it preferred for high-density, high-speed digital interface protection where PCB real estate and signal fidelity are critical.

Availability

SMDA05C-7/TR7 is available at Aetrix Electronics and suitable for USB 2.0 interface protection, industrial RS-485 networks, and automotive infotainment display interfaces requiring stable component supply and long-term lifecycle support.

Supply support for SMDA05C-7/TR7 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability protection, power management, and signal integrity solutions.

The SMDAxxC-7 series was developed specifically for board-level ESD and surge protection of multi-line digital interfaces in automotive, industrial, and consumer electronics-emphasizing compact integration and IEC-compliant robustness.

FAQ

What is the standoff voltage rating of the SMDA05C-7/TR7?

The SMDA05C-7/TR7 has a standoff voltage (V_WM) of 5.0 V, meaning it remains non-conductive below this DC or continuous peak voltage. This rating aligns with standard 5 V logic systems and ensures compatibility with TTL, CMOS, and microprocessor I/O rails without leakage-induced interference. The SMDA05C-7/TR7 maintains this specification across its full operating temperature range of –55 °C to +150 °C.

How many signal lines does the SMDA05C-7/TR7 protect?

The SMDA05C-7/TR7 protects exactly seven bidirectional data or interface lines in a single SO-8 package. Its internal architecture uses three shared cathode nodes (Pins 2, 5, and 8) to support seven anode terminals (Pins 1, 3, 4, 6, 7, and two internal connections), enabling compact board-level protection for parallel buses, memory card interfaces, or multi-wire serial links without discrete component proliferation.

Is the SMDA05C-7/TR7 compliant with IEC 61000-4-2 ESD testing?

Yes, the SMDA05C-7/TR7 is designed and tested to meet IEC 61000-4-2 Level 4: ±15 kV contact discharge and ±20 kV air discharge. Its silicon avalanche structure provides sub-nanosecond response, ensuring clamping occurs before ESD energy couples into sensitive downstream ICs. This compliance is verified per the manufacturer's qualification report MSC0888.PDF and applies to all seven channels simultaneously.

What is the clamping voltage of the SMDA05C-7/TR7 at 1 A surge current?

The SMDA05C-7/TR7 clamps to a maximum of 9.8 V at 1 A (8/20 µs waveform), as specified in the Electrical Characteristics table. This value defines the upper voltage limit imposed on protected lines during transient events, ensuring 5 V logic components remain within their absolute maximum input ratings. The SMDA05C-7/TR7 achieves this with low dynamic impedance and repeatable performance across temperature and lifetime.

Does the SMDA05C-7/TR7 require external biasing or control signals?

No, the SMDA05C-7/TR7 is a passive, always-active TVS array requiring no external power, biasing, or control signals. It operates solely on voltage threshold behavior: conducting only when line voltage exceeds its breakdown rating (~6.0 V). This self-contained operation makes the SMDA05C-7/TR7 ideal for retrofitting into existing designs and simplifies layout by eliminating support circuitry.