Diodes Incorporated SMBJ9.0CA-13-F

Overview

SMBJ9.0CA-13-F from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in SMB package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 9.0 V reverse standoff voltage (VRWM), 10.0–11.5 V breakdown voltage (VBR), 15.4 V max clamping voltage (VC) at 39.0 A peak pulse current (IPP), and 600 W peak pulse power dissipation - validated for IEC 61000-4-2 ESD and IEC 61000-4-4 EFT compliance in industrial power supplies.

For engineers reviewing the SMBJ9.0CA-13-F datasheet, SMBJ9.0CA-13-F pinout, SMBJ9.0CA-13-F application, or SMBJ9.0CA-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, unidirectional vs. bi-directional polarity requirements for AC-coupled or bidirectional data lines, thermal derating above +25°C, and compatibility with 8.3 ms half-sine surge waveforms per IEC 61000-4-5.

Technical Context

This bi-directional TVS operates symmetrically across both polarities, enabling protection of AC signals, differential buses (e.g., RS-485, CAN), and floating power domains without polarity constraints. Its glass-passivated junction ensures stable leakage (<5.0 µA at VRWM) and repeatable clamping performance under repetitive transients.

The device uses a single-junction avalanche structure optimized for fast response (<1.0 ns typical), low dynamic impedance, and minimal capacitance (≈100 pF at 1 MHz, zero bias). It is rated for continuous operation from –55°C to +150°C junction temperature and supports lead-free reflow soldering per JEDEC J-STD-020 Level 1 moisture sensitivity.

Key Specifications

Pinout & Package

Two-terminal SMB package: Cathode band omitted (bi-directional); terminals are non-polarized anode/cathode pair. Molded plastic case meets UL 94V-0 flammability rating; matte tin-plated leads ensure solderability per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ9.0A-13-F and SMAJ9.0CA, SMBJ9.0CA-13-F delivers superior bidirectional surge resilience and higher clamping margin control - critical for noise-immune communication interfaces and safety-critical power monitoring circuits where polarity uncertainty or AC coupling exists.

Availability

SMBJ9.0CA-13-F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, RS-485 field networks, and AC-DC adapter secondary-side protection requiring stable component supply and full RoHS/halogen-free compliance.

Supply support for SMBJ9.0CA-13-F 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The SMBJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability board-level surge protection in industrial automation, automotive electronics, and power conversion systems where robustness against repetitive transients is mandatory.

FAQ

What is the difference between SMBJ9.0CA-13-F and SMBJ9.0A-13-F?

SMBJ9.0CA-13-F is bi-directional (no polarity marking), while SMBJ9.0A-13-F is uni-directional (cathode-banded). The "C" suffix indicates symmetrical clamping for AC or floating circuits. Bi-directional leakage is doubled per datasheet Note 10, but clamping performance and package are identical.

Can SMBJ9.0CA-13-F be used for IEC 61000-4-5 surge protection?

Yes - its 600 W peak pulse rating and 15.4 V clamping voltage at 39.0 A support direct implementation against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges on 24 V lines. Layout must include low-inductance grounding and adequate PCB copper pour for thermal dissipation.

What is the maximum operating temperature for continuous use?

The junction temperature range is –55°C to +150°C. At ambient temperatures above +25°C, peak pulse power must be linearly derated at 4.8 W/°C per datasheet Figure 1. Steady-state power dissipation is limited to 5.0 W at TL = +75°C.

Is SMBJ9.0CA-13-F compatible with lead-free reflow processes?

Yes - it features matte tin-plated leads qualified for Pb-free reflow per JEDEC J-STD-020, with moisture sensitivity level 1 (unlimited floor life at ≤30°C/60% RH). Peak reflow temperature must not exceed 260°C for ≤10 seconds.