Microchip Technology SMDA15C-7/TR13

Overview

SMDA15C-7/TR13 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), 15 V standoff voltage (V_WM), and clamping voltage of 24 V at 1 A. It protects up to 7 I/O lines in ESD-sensitive digital interfaces including TTL, CMOS, and microprocessor I/O transceivers.

For engineers reviewing the SMDA15C-7/TR13 datasheet, SMDA15C-7/TR13 pinout, SMDA15C-7/TR13 application, or SMDA15C-7/TR13 equivalent, key selection criteria include standoff voltage matching circuit operating voltage, clamping performance under 1–5 A surge current, IEC 61000-4-2/4-4 compliance, and SO-8 board-level integration with 7-line bidirectional protection.

Technical Context

This TVS array implements a monolithic silicon avalanche diode structure per channel, configured as seven independent bidirectional clamping cells in a single SO-8 package. Each line provides symmetrical breakdown at ±16.7 V (min), with guaranteed clamping ≤24 V at 1 A and ≤30 V at 5 A per IEC 61000-4-2 waveform testing.

Designed for board-level ESD and EFT suppression, it operates across –55 °C to +150 °C and exhibits low leakage (<1 µA at 15 V), 70 pF typical capacitance at 0 V (1 MHz), and +11 mV/°C temperature coefficient of V_BR, enabling stable protection in thermally varying environments.

Key Specifications

Pinout & Package

SO-8 surface-mount package (JEDEC MS-012AC), 5.0 mm × 4.0 mm footprint, 1.27 mm pitch, 1.75 mm max height. Pin #1 identified by dot marking on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMDA12C-7/TR13, SMDA15C-7/TR13 offers higher standoff margin for 15 V systems and improved surge headroom; compared with SMAJ15A, it delivers integrated 7-line protection with matched timing and lower parasitic inductance, reducing design effort and board space by >60%.

Availability

SMDA15C-7/TR13 is available at Aetrix Electronics and suitable for industrial HMI panels, automotive body control modules, and networked security cameras requiring stable component supply, long-term lifecycle support, and IEC-compliant transient protection.

Supply support for SMDA15C-7/TR13 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 protection, power management, and signal integrity solutions for industrial, computing, and automotive markets.

The SMDAxxC-7 TVS array product line is engineered for board-level ESD/EFT suppression in multi-line digital interfaces, emphasizing low capacitance, precise clamping, and SO-8 integration to simplify front-end protection design.

FAQ

What is the maximum clamping voltage of SMDA15C-7/TR13 at 5 A surge current?

The SMDA15C-7/TR13 has a maximum clamping voltage of 30 V at 5 A (8/20 µs waveform), as specified in the MSC0888.PDF datasheet. This value ensures downstream ICs-such as microcontroller I/O ports or transceivers-remain within safe voltage limits during high-energy transients. The clamping performance is validated per IEC 61000-4-2 and IEC 61000-4-4 standards. SMDA15C-7/TR13 maintains this rating across its full operating temperature range.

Is SMDA15C-7/TR13 compatible with 3.3 V or 5 V logic interfaces?

SMDA15C-7/TR13 is not recommended for direct protection of 3.3 V or 5 V logic interfaces due to its 15 V standoff voltage (V_WM), which exceeds typical logic rail voltages and risks insufficient clamping margin. It is optimized for 12–15 V systems such as industrial I/O, LIN bus, or analog sensor inputs. For 3.3 V/5 V lines, SMDA03C-7/TR13 or SMDA05C-7/TR13 are appropriate alternatives. SMDA15C-7/TR13 must be applied only where working voltage ≥15 V.

Does SMDA15C-7/TR13 require external series impedance for optimal ESD protection?

No, SMDA15C-7/TR13 is designed for direct placement at I/O connectors or IC pins without mandatory series impedance. Its low dynamic impedance and fast response (<1 ns) enable effective clamping without added resistors or ferrites. However, in high-speed interfaces (e.g., USB 2.0), layout best practices-including short traces to ground and minimized loop area-are essential. SMDA15C-7/TR13 performance is validated per IEC 61000-4-2 with standard PCB mounting.

What is the thermal derating behavior of SMDA15C-7/TR13 above 25 °C?

SMDA15C-7/TR13 exhibits a temperature coefficient of +11 mV/°C for breakdown voltage (V_BR), meaning V_BR increases linearly with junction temperature. Peak pulse power remains rated at 300 W up to +150 °C, but repetitive surge capability decreases above 85 °C ambient due to thermal accumulation. Derating curves are provided in Figure 1 of MSC0888.PDF. SMDA15C-7/TR13 must be mounted on thermally robust pads with adequate copper pour for sustained surge duty.

How is pin 1 identified on the SMDA15C-7/TR13 SO-8 package?

Pin 1 of the SMDA15C-7/TR13 is identified by a small dot marking on the top surface of the SO-8 package, located near the lead edge. This marking aligns with JEDEC MS-012AC mechanical specifications and matches the pin 1 indicator shown in the "MOUNTING PAD SO-8" diagram in MSC0888.PDF. Correct orientation is critical for proper channel-to-line assignment; misalignment may result in unprotected signal paths. SMDA15C-7/TR13 pinout follows standard SO-8 numbering (counterclockwise from pin 1).