Diodes Incorporated 3.0SMCJ9.0AQ-13

Overview

3.0SMCJ9.0AQ-13 from Diodes Incorporated is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in automotive power rails and industrial DC inputs. It features a 9.0V reverse standoff voltage (VRWM), 15.4V maximum clamping voltage (VC) at 194.8A peak pulse current (IPP), and IEC-61000-4-2 ESD immunity of 30kV (air/contact). Its glass-passivated die ensures stable clamping under repetitive surge stress.

For engineers reviewing the 3.0SMCJ9.0AQ-13 datasheet, 3.0SMCJ9.0AQ-13 pinout, 3.0SMCJ9.0AQ-13 application, or 3.0SMCJ9.0AQ-13 equivalent, key selection criteria include clamping ratio (VC/VRWM = 1.71), junction temperature range (–55°C to +150°C), unidirectional polarity marking (cathode band), and SMC package thermal performance with 8.00 mm² copper land area.

Technical Context

This TVS diode operates as a voltage-clamped crowbar device during transients, entering avalanche breakdown when reverse voltage exceeds its 10.0–11.05V breakdown range (VBR @ IT = 1.0mA). Its 3000W peak pulse power rating is validated per 10×1000μs waveform (Fig. 2), with derating above +25°C ambient per Fig. 1.

It supports automotive-grade reliability via AEC-Q101 qualification, IATF 16949 manufacturing, and robust ESD/HBM/CDM/MSL1 ratings. The unidirectional configuration requires correct cathode-band orientation in series with protected line, enabling fast response (<1ns) to EFT and lightning-induced surges without forward conduction in normal operation.

Key Specifications

Pinout & Package

Package: SMC (DO-214AB), surface-mount, molded plastic body with matte tin-plated leads (RoHS-compliant), weight ≈ 0.21g. Cathode band denotes unidirectional polarity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TVS diode applications.

Compared with SMBJ9.0A-13-F and 1.5SMCJ9.0A, the 3.0SMCJ9.0AQ-13 delivers double the pulse power capacity and 2× higher peak current handling in the same SMC footprint-critical for automotive load dump compliance where sustained 3000W dissipation must occur without thermal runaway.

Availability

3.0SMCJ9.0AQ-13 is available at Aetrix Electronics and suitable for automotive ECU power protection, industrial PLC input stages, USB-C VBUS hardening, and telecom –48V interface circuits requiring stable component supply across extended product lifecycles.

Supply support for 3.0SMCJ9.0AQ-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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with design centers in Asia, Europe, and the U.S., and manufacturing in IATF 16949-certified facilities.

This part belongs to the 3.0SMCJ(C)A series of high-power TVS diodes engineered specifically for AEC-Q101-compliant automotive and harsh-environment industrial surge protection, emphasizing clamping consistency, thermal robustness, and long-term reliability.

FAQ

What does the 'Q' suffix in 3.0SMCJ9.0AQ-13 signify?

The 'Q' suffix indicates AEC-Q101 qualification, meaning this device has undergone rigorous stress testing-including high-temperature operating life, temperature cycling, and ESD-to meet automotive reliability standards. It is manufactured in IATF 16949-certified facilities and supports PPAP documentation for Tier 1 suppliers.

Can 3.0SMCJ9.0AQ-13 be used in bidirectional configurations?

No-it is a unidirectional TVS diode, identified by the cathode band marking. Bidirectional variants in the same family (e.g., 3.0SMCJ9.0CA-13) lack the cathode band and provide symmetrical clamping for AC or floating lines. Using this part in reverse-biased AC applications would cause permanent forward conduction and failure.

What PCB layout practices maximize its 3000W surge capability?

To achieve rated 3000W performance, mount the device on 8.00 mm² (minimum) copper land areas per terminal, using ≥2 oz copper thickness. Avoid thermal vias directly under the body; instead, use perimeter thermal reliefs and connect lands to internal ground/power planes via multiple 0.3mm vias spaced ≥1mm apart to minimize inductance and distribute heat.

How does its clamping voltage compare to competing 9V TVS diodes?

At 194.8A IPP, its 15.4V clamping voltage yields a clamping ratio (VC/VRWM) of 1.71-tighter than typical industry values of 1.8–2.0. This 0.09–0.29V advantage over alternatives like SMBJ9.0A (VC = 15.5V @ 83.3A) directly improves margin for 16V-rated downstream components in 12V systems.