Diodes Incorporated 3.0SMCJ7.0A-13

Overview

3.0SMCJ7.0A-13 from Diodes Incorporated is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 7.0V reverse standoff voltage (VRWM), 7.78–8.60V breakdown voltage (VBR) at 10mA, 12.0V maximum clamping voltage (VC) at 250A peak pulse current, and IEC-61000-4-2 ESD immunity of 30kV (air/contact). It is used in automotive infotainment power inputs to clamp load-dump transients.

For engineers reviewing the 3.0SMCJ7.0A-13 datasheet, 3.0SMCJ7.0A-13 pinout, 3.0SMCJ7.0A-13 application, or 3.0SMCJ7.0A-13 equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, peak pulse current capability under ISO 7637-2 Pulse 5a, thermal derating above +25°C ambient, and SMC package solderability per MIL-STD-202 Method 208.

Technical Context

This TVS operates as a silicon avalanche diode with glass-passivated die construction, enabling fast response (<1.0 ns) to transient events and stable clamping performance across -55°C to +150°C junction temperature. Its unidirectional configuration uses a cathode band for polarity identification and requires series fuse coordination in high-energy surge environments.

The device complies with JEDEC reliability standards and supports automotive-grade change control via Q-suffix variants. It is rated for 3000W peak pulse power (10×1000μs waveform), 300A non-repetitive forward surge current (8.3ms half-sine), and exhibits ≤200μA reverse leakage at VRWM - critical for low-quiescent-power battery-backed systems.

Key Specifications

Pinout & Package

Package: SMC (DO-214AB), molded plastic, UL 94V-0 rated, 0.21g weight. Terminals are matte tin-plated leads, solderable per MIL-STD-202 Method 208. Unidirectional variant features cathode band marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ7.0A-13 and 1.5SMC7.0A, the 3.0SMCJ7.0A-13 delivers double the surge energy handling of the SMBJ and twice the peak power of the 1.5SMC, making it the sole option qualified for full ISO 7637-2 compliance in 12V automotive systems.

Availability

3.0SMCJ7.0A-13 is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and telecom infrastructure requiring stable component supply with guaranteed long-term availability and AEC-Q-aligned manufacturing traceability.

Supply support for 3.0SMCJ7.0A-13 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 for automotive, industrial, and consumer markets.

This part belongs to the 3.0SMCJ series of high-power TVS diodes engineered specifically for robust transient suppression in harsh automotive and industrial environments where sustained 3000W surge immunity is mandatory.

FAQ

What is the maximum clamping voltage of the 3.0SMCJ7.0A-13 at its rated peak pulse current?

The maximum clamping voltage (VC) is 12.0V at 250A peak pulse current (IPP), measured using the standardized 10×1000μs waveform per REA definition. This value is guaranteed across the full operating temperature range and forms the basis for downstream IC overvoltage margining.

Is the 3.0SMCJ7.0A-13 suitable for bidirectional signal line protection?

No - the "A" suffix denotes unidirectional operation with a cathode band marking. For bidirectional protection (e.g., RS-485, CAN bus), the "CA" variant (e.g., 3.0SMCJ7.0CA-13) must be used, which has symmetrical breakdown in both polarities and no polarity indicator.

Does this TVS require external thermal relief or heatsinking in standard SMC land patterns?

No - the device is rated for 3000W peak power with standard 8.00mm² copper land areas per Diodes' test condition (Note 6). Thermal derating follows Fig. 1: at +85°C ambient, peak power drops to ~75% (2250W), still sufficient for most automotive transients without added copper.

How does the 3.0SMCJ7.0A-13 differ from the older SMCJ7.0A series?

The "3.0" prefix indicates updated process and qualification - including enhanced ESD robustness (30kV vs. earlier 20kV), tighter VBR tolerance (±6% vs. ±10%), and JEDEC High Reliability certification aligned with AEC-Q101. The SMC package dimensions and electrical markings remain identical for drop-in replacement.