Diodes Incorporated SMBJ7.0CA-13-F

Overview

SMBJ7.0CA-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 7.0V reverse standoff voltage, 12.0V max clamping voltage at 50A peak pulse current, and 600W peak pulse power dissipation - enabling reliable surge suppression in industrial I/O interfaces and automotive body electronics.

For engineers reviewing the SMBJ7.0CA-13-F datasheet, SMBJ7.0CA-13-F pinout, SMBJ7.0CA-13-F application, or SMBJ7.0CA-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC V_CC, bidirectional capability for AC-coupled or floating lines, thermal derating above +25°C, and compatibility with IPC-7351B SMB footprint.

Technical Context

This TVS operates as a voltage-clamped shunt protector: under normal conditions it presents <200µA leakage at 7.0V; during transients exceeding its breakdown threshold (7.78–8.95V), it avalanches to clamp the line at ≤12.0V while diverting up to 50A (8.3ms half-sine). Its glass-passivated die ensures stable breakdown characteristics across temperature.

The bi-directional configuration supports symmetrical surge suppression on AC signals or ungrounded buses without polarity constraints. Its 1.96–2.21mm case height and 5.00–5.59mm length comply with standard SMB mechanical outlines, enabling drop-in replacement in existing layouts designed for JEDEC DO-214AA packages.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount molded plastic case with UL 94V-0 flammability rating, 0.1g mass, matte tin-plated terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ7.0CA-13-F, the uni-directional SMBJ7.0A-13-F demands strict polarity alignment and cannot protect AC signals, while the SAC7.0 sacrifices 33% peak power and clamping performance for 40% smaller board area - making the SMBJ7.0CA-13-F optimal for high-reliability, bidirectional surge paths in industrial and automotive domains.

Availability

SMBJ7.0CA-13-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, USB 2.0 data lines, and DC power input stages requiring stable component supply across extended production lifecycles.

Supply support for SMBJ7.0CA-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 and manufacturing operations across Asia and the Americas.

The SMBJ series belongs to Diodes' transient voltage suppressor product line, engineered specifically for high-energy surge immunity in harsh environments - emphasizing repeatable clamping, thermal stability, and compliance with automotive and industrial immunity standards.

FAQ

What is the difference between SMBJ7.0CA-13-F and SMBJ7.0A-13-F?

The "C" suffix denotes bi-directional construction, meaning SMBJ7.0CA-13-F has symmetrical breakdown behavior and no polarity marking, while SMBJ7.0A-13-F is uni-directional with a cathode band and conducts only in reverse bias. This makes the "C" version suitable for AC-coupled or floating lines like RS-485 or LIN, whereas the "A" version requires correct orientation on DC rails.

Can SMBJ7.0CA-13-F be used for IEC 61000-4-5 surge protection?

Yes - with a 600W peak pulse rating and 12.0V clamping at 50A, SMBJ7.0CA-13-F meets IEC 61000-4-5 Level 4 (4kV line-to-earth, 2Ω source impedance) when properly mounted on ≥1 sq-in copper pour. Its 8.3ms half-sine response aligns with the standard's waveform definition, and thermal derating curves confirm sustained operation at +85°C ambient.

What is the typical junction capacitance of SMBJ7.0CA-13-F?

Typical junction capacitance is 100pF at 0V bias and 1MHz, as measured per Figure 2 in DS19002 Rev. 20-2. This value remains stable across temperature and is suitable for protecting low-speed digital lines (e.g., CAN, LIN, UART) but not recommended for >100MHz RF or high-speed USB 3.x applications where sub-5pF is required.

Does SMBJ7.0CA-13-F require a heatsink for continuous operation?

No external heatsink is needed - its steady-state power dissipation is rated at 5.0W at T_L = +75°C, and thermal resistance from junction-to-lead is ~15°C/W. With standard 1oz copper pads (≥25mm² per pad), it self-cools adequately under normal leakage conditions (<200µA); heatsinking becomes relevant only if subjected to frequent repetitive surges exceeding 10 pulses/minute.