Diodes Incorporated 3.0SMCJ7.5CA-13

Overview

3.0SMCJ7.5CA-13 from Diodes Incorporated is a bi-directional 3000W surface-mount transient voltage suppressor (TVS) designed for robust overvoltage protection in DC power rails and signal lines. It features a 7.5V reverse standoff voltage (VRWM), 12.9V max clamping voltage (VC) at 232.6A peak pulse current, and meets IEC-61000-4-2 ESD immunity (30kV air/30kV contact). It is used in industrial power supplies and automotive body control modules to safeguard sensitive ICs against lightning-induced surges and EFT events.

For engineers reviewing the 3.0SMCJ7.5CA-13 datasheet, 3.0SMCJ7.5CA-13 pinout, 3.0SMCJ7.5CA-13 application, or 3.0SMCJ7.5CA-13 equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, peak pulse current handling under 10/1000μs waveform, bi-directional symmetry for AC-coupled or floating lines, and SMC package thermal performance on 8mm² copper land.

Technical Context

This TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds its breakdown threshold (8.33–9.21V), it avalanches into low-impedance conduction, diverting surge current away from downstream circuitry. Its bi-directional configuration enables symmetrical clamping on both polarities without polarity dependency.

It is characterized using the standardized 10×1000μs double-exponential surge waveform per REA, with thermal derating applied above +25°C ambient per Fig. 1. The glass-passivated junction ensures stable breakdown characteristics and low leakage (<100µA at VRWM), critical for low-power standby circuits.

Key Specifications

Pinout & Package

Package: SMC (DO-214AB), surface-mount, molded plastic body with UL 94V-0 flammability rating; weight ≈0.21g; moisture sensitivity level 1 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ7.5CA-13, this part delivers 5× higher surge energy handling and superior thermal stability; versus 1.5SMCJ7.5CA, it offers tighter clamping (12.9V vs 13.3V) and higher surge current margin (232.6A vs 225A), making it optimal for high-reliability industrial power entry points.

Availability

3.0SMCJ7.5CA-13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, USB-C interface protection, and RS-485 communication systems requiring stable component supply across extended product lifecycles.

Supply support for 3.0SMCJ7.5CA-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 industrial, automotive, and computing markets.

This device belongs to the 3.0SMCJ series of high-power TVS diodes engineered specifically for robust transient suppression in harsh environments-designed to meet IEC-61000-4-2/4-5 and AEC-Q101 requirements where failure modes must be mitigated at system level.

FAQ

What is the difference between 'CA' and 'A' suffixes in the 3.0SMCJ series?

The 'CA' suffix denotes bi-directional configuration, meaning the device provides symmetrical clamping for both positive and negative transients without polarity marking. In contrast, 'A' indicates uni-directional operation with a cathode band for polarity-sensitive placement. For floating or AC-coupled lines, CA is mandatory; for DC rails with known polarity, A may offer marginally lower leakage.

Can 3.0SMCJ7.5CA-13 be used in place of a 12V-rated TVS for 12V automotive systems?

No-it is rated for 7.5V VRWM and clamps at 12.9V, making it unsuitable for 12V nominal systems where normal operating voltage may exceed VRWM and cause excessive leakage or thermal runaway. For 12V systems, use 3.0SMCJ12CA-13 (VRWM = 12V, VC = 19.9V) to maintain ≥2V margin above nominal rail.

How does the SMC package affect thermal performance compared to SMA or SMB?

The SMC package offers ~2.5× larger copper pad area than SMB, enabling higher power dissipation: at +25°C, it sustains full 3000W; at +85°C, it retains ~70% derated power. Its 0.21g mass and 8mm² recommended land provide superior heat spreading versus smaller packages, critical for repeated surge events.

Is this part qualified for automotive applications under AEC-Q101?

The standard 3.0SMCJ7.5CA-13 is not AEC-Q101 qualified; however, Diodes offers automotive-grade variants with 'Q' suffix (e.g., 3.0SMCJ7.5CAQ-13) that undergo additional stress testing, PPAP documentation, and IATF 16949 manufacturing controls. These are required for safety-critical vehicle subsystems.