Microchip Technology SMDA05C-7E3/TR7

Overview

SMDA05C-7E3/TR7 from Diodes Incorporated is a bidirectional transient voltage suppressor (TVS) array in SO-8 package, designed for board-level ESD and EFT protection of up to 7 I/O lines. It features a 5.0 V standoff voltage (V_WM), 6.0 V minimum breakdown voltage (V_BR), and clamps to 9.8 V at 1 A, with 300 W peak pulse power (8/20 µs), targeting TTL/CMOS I/O transceivers and microprocessor interfaces.

For engineers reviewing the SMDA05C-7E3/TR7 datasheet, SMDA05C-7E3/TR7 pinout, SMDA05C-7E3/TR7 application, or SMDA05C-7E3/TR7 equivalent, key selection criteria include standoff voltage matching circuit operating voltage, clamping performance under 1–5 A surge, SO-8 footprint compatibility, IEC 61000-4-2/4-4 compliance, and low line capacitance for high-speed data lines.

Technical Context

This TVS array operates as a parallel-connected, clamping-type protector across each protected line and ground. Each of its seven channels uses a symmetrical dual-diode configuration to provide bidirectional surge suppression without polarity dependence.

It responds to fast-rising transients (e.g., ±8 kV contact ESD per IEC 61000-4-2) by avalanche breakdown below 10 ns, limiting voltage to ≤11 V at 5 A while maintaining <40 µA leakage at 5.0 V. Thermal design supports continuous operation from –55 °C to +150 °C.

Key Specifications

Pinout & Package

SO-8 surface-mount package (JEDEC MS-012AC), molded plastic body with gull-wing leads; pin #1 identified by dot marking; 0.150" (3.81 mm) body width; 1.27 mm pitch; 0.206" (5.23 mm) length.

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-7E3/TR7 delivers optimal balance of low clamping (9.8 V), shared-cathode SO-8 integration, and proven IEC 61000-4-2/4-4 performance-making it ideal for space-constrained, multi-line 5 V interface protection where ground inductance and layout simplicity are critical.

Availability

SMDA05C-7E3/TR7 is available at Aetrix Electronics and suitable for industrial HMI interfaces, automotive body control modules, and medical diagnostic port protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for SMDA05C-7E3/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/EFT hardening of multi-line digital interfaces in automotive, industrial, and medical equipment-emphasizing low clamping, thermal robustness, and standardized SO-8 assembly.

FAQ

What is the standoff voltage rating of the SMDA05C-7E3/TR7?

The SMDA05C-7E3/TR7 has a standoff voltage (V_WM) of 5.0 V, meaning it remains non-conductive under continuous 5.0 V DC or RMS conditions. This rating aligns with standard 5 V logic systems and ensures the device does not interfere with normal signal operation while providing reliable surge response above that threshold. The SMDA05C-7E3/TR7 is specified to begin breakdown at a minimum of 6.0 V.

How many I/O lines can the SMDA05C-7E3/TR7 protect simultaneously?

The SMDA05C-7E3/TR7 protects exactly seven bidirectional data or interface lines using its internal seven-channel architecture. Each channel consists of a symmetrical dual-diode pair, and all cathodes are internally tied to a common ground node (pins 2, 4, 6, and 8). This configuration enables compact, coordinated protection of multi-signal interfaces like parallel buses or multi-wire serial links without external grounding complexity.

Is the SMDA05C-7E3/TR7 compliant with IEC 61000-4-2 and IEC 61000-4-4 standards?

Yes, the SMDA05C-7E3/TR7 is explicitly rated for compliance with IEC 61000-4-2 (ESD immunity) and IEC 61000-4-4 (electrical fast transients). Its 300 W peak pulse power rating (8/20 µs) and sub-10 ns response time enable it to suppress ±8 kV contact discharges and repetitive EFT bursts without degradation. These capabilities are validated in the official MSC0888.PDF datasheet and confirmed across production lots.

What is the clamping voltage of the SMDA05C-7E3/TR7 at 5 A surge current?

The clamping voltage of the SMDA05C-7E3/TR7 is 11 V maximum at 5 A (8/20 µs pulse), as specified in the Electrical Characteristics table. This value defines the upper voltage limit imposed on protected circuits during high-current transients. At lower currents-such as 1 A-the SMDA05C-7E3/TR7 clamps to 9.8 V max, offering tighter protection margins for sensitive 5 V logic families.

Does the SMDA05C-7E3/TR7 require external components for basic ESD protection?

No, the SMDA05C-7E3/TR7 operates as a standalone TVS array and requires no external resistors, capacitors, or biasing networks for fundamental ESD/EFT suppression. It is designed for direct placement between protected I/O lines and ground. However, optimal PCB layout-short traces, low-inductance ground pour, and proximity to connectors-is essential to preserve its 9.8 V clamping performance at 1 A. The SMDA05C-7E3/TR7 integrates all necessary protection elements internally.