Microchip Technology SMDA05-6E3/TR7

Overview

SMDA05-6E3/TR7 from Microsemi (now Microchip Technology) is a unidirectional 6-channel 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 9.8 V clamping voltage at 1 A. It protects I/O transceivers, microprocessors, and SRAM/DRAM interfaces against ESD per IEC 61000-4-2 and EFT per IEC 61000-4-4.

For engineers reviewing the SMDA05-6E3/TR7 datasheet, SMDA05-6E3/TR7 pinout, SMDA05-6E3/TR7 application, or SMDA05-6E3/TR7 equivalent, key selection criteria include V_WM ≥ circuit operating voltage, sub-10 V clamping at 1 A, ≤550 pF line capacitance at 1 MHz, -55°C to +150°C operating range, and SO-8 board-level mounting compatibility.

Technical Context

This TVS array employs silicon avalanche diode technology with six independent unidirectional protection channels sharing dual GND terminals. Each channel exhibits sharp breakdown at minimum 6.0 V (V_BR @ 1 mA) and clamps transient energy within 9.8 V (V_C @ 1 A) and 11 V (V_C @ 5 A), enabling robust protection of 5 V logic interfaces without signal distortion.

Designed for board-level surge suppression, it operates across -55°C to +150°C and supports <0.01% pulse repetition rate. Its 550 pF line-to-ground capacitance at 0 V and 1 MHz ensures minimal impact on high-speed digital signals such as those in UART, SPI, or parallel I/O buses.

Key Specifications

Pinout & Package

Molded SO-8 surface-mount package (JEDEC MS-012AC), 0.150–0.158 inch body width, 1.27 mm pitch, 0.050 inch lead thickness, marked with "SDA6" and date code; Pin #1 identified by dot on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ5.0A, SMDA05-6E3/TR7 saves 75% board area and ensures matched channel response; versus PGB1010603, it offers tighter 9.8 V clamping critical for 5 V microcontroller I/O protection, albeit with higher 550 pF capacitance acceptable for ≤5 Mbps interfaces.

Availability

SMDA05-6E3/TR7 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for SMDA05-6E3/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

Microsemi Corporation (acquired by Microchip Technology in 2018) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.

The SMDAxx-6 TVS array product line was engineered specifically for board-level ESD and EFT protection of 3.3 V to 24 V digital interfaces, emphasizing low clamping voltage, multi-line integration, and extended temperature resilience.

FAQ

What is the standoff voltage rating of the SMDA05-6E3/TR7?

The SMDA05-6E3/TR7 has a standoff voltage (V_WM) of 5.0 V, meaning it remains non-conductive up to this DC or continuous peak AC voltage. This rating aligns with standard 5 V logic families and ensures no interference during normal operation while providing headroom for transient suppression. The SMDA05-6E3/TR7 is designed to activate only when voltage exceeds its minimum breakdown threshold of 6.0 V.

Does the SMDA05-6E3/TR7 support bidirectional signal lines?

No, the SMDA05-6E3/TR7 is strictly unidirectional-it protects signals referenced to ground with anode-to-line configuration. For bidirectional lines like USB D+ or CAN H/L, a different device such as the SMBJ5.0CA or dedicated bidirectional arrays must be used. The SMDA05-6E3/TR7's internal structure connects each anode to a separate I/O pin and cathodes to dual GND pins, precluding reverse-path conduction.

What is the clamping voltage of the SMDA05-6E3/TR7 at 5 A surge current?

The SMDA05-6E3/TR7 clamps to a maximum of 11 V at 5 A (8/20 µs waveform), as specified in the MSC0332A.PDF datasheet. This value ensures protected ICs experience limited overvoltage stress even under high-current transients. The SMDA05-6E3/TR7 maintains this performance across its full operating temperature range, with typical variation less than ±5% from -40°C to +85°C.

Is the SMDA05-6E3/TR7 RoHS compliant and halogen-free?

Yes, the SMDA05-6E3/TR7 conforms to RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. Its SO-8 molding compound contains no brominated flame retardants or chlorine-based additives. The SMDA05-6E3/TR7 carries Microchip's standard environmental compliance certification, documented in their PPAP and material declarations available upon request.

How many independent protection channels does the SMDA05-6E3/TR7 provide?

The SMDA05-6E3/TR7 integrates six independent unidirectional TVS channels in a single SO-8 package, with Pins 1–3 and 6–8 serving as anodes for individual I/O lines, and Pins 4 and 5 as separate GND returns. This architecture allows simultaneous protection of six discrete signals-such as parallel bus lines or multiple sensor inputs-without crosstalk or shared impedance effects. The SMDA05-6E3/TR7 achieves full channel independence through internal die segmentation and dedicated bond wire paths.