SMBJ7.0CA is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB/DO-214AA package, part of Slkor's SMBJ series, with a reverse stand-off voltage V_RWM of 7.0V. Built on a glass-passivated die, it offers 600W peak pulse power, fast response and excellent clamping capability, with UL94V-0 flammability-rated molding. It is intended for ESD, EFT and surge transient over-voltage protection at I/O ports, power supply lines and high-speed data lines.

Slkor Transient Protection Diode P6SMB22A product photo

1. Key Product Parameters

Unless otherwise noted, ambient temperature T_A=25℃. Series-wide absolute maximum ratings apply across the SMBJ family; SMBJ7.0CA-specific electrical parameters are listed separately.

1.1 Series-wide absolute maximum ratings

• Peak pulse power dissipation P_PK: 600W (non-repetitive pulse, T_A=25℃ baseline; derate by pulse width and ambient temperature);
• Peak forward surge current I_FSM: 100A (8.3ms single half-sine wave; maximum duty cycle 4 pulses per minute);
• Instantaneous forward voltage V_F: 3.5V for V_BR<100V devices at I_PP=35A; 5.0V for V_BR>100V devices;
• Operating and storage temperature range T_J/T_STG: -55℃ to +150℃.

1.2 SMBJ7.0CA electrical parameters

• Reverse stand-off voltage V_RWM: 7.0V (bidirectional);
• Breakdown voltage V_BR: min 7.78V, max 8.95V at test current I_T=10mA;
• Maximum clamping voltage V_C: 12.0V at peak pulse current I_PP=50.0A;
• Reverse leakage current I_R: max 200μA at V_RWM=7.0V;
• Response time: fast (inherent TVS nanosecond-scale turn-on).

1.3 Package and mechanical data

• Package: SMB/DO-214AA molded plastic SMD;
• Flammability rating: UL94V-0;
• Weight: approx. 0.093 g;
• Terminals: solder-plated, solderable per MIL-STD-750, Method 2026;
• Marking: KM (bidirectional version);
• Body dimensions (mm): overall length 5.00–5.59, body width 4.06–4.70, body height 3.30–3.94, thickness 1.91–2.21;
• Polarity: bidirectional device has no polarity markings (unidirectional units use cathode band or notch).

2. Core Product Features

1. Glass-passivated die construction for low reverse leakage and high long-term reliability.
2. Bidirectional protection (CA suffix) with no polarity concern, suitable for AC or polarity-uncertain lines.
3. 600W peak pulse power under 8/20μs-equivalent surge waveform.
4. Excellent clamping performance: V_C as low as 12.0V at 50A I_PP, limiting transient over-voltage to a safe level.
5. Fast response time for nanosecond-scale transient suppression.
6. Surface-mount SMB package with UL94V-0 flame-retardant molding, compatible with standard SMT assembly.
7. Broad voltage family: the series spans V_RWM from 5.0V to 170V, with an "A" suffix low-leakage variant for consistent system-level selection.

3. Main Application Fields

1. ESD and ESD protection at electronic equipment I/O ports.
2. Surge transient suppression at power supply input and secondary-side rails.
3. Portable electronics, computer and peripheral interface protection.
4. Automotive electronics and industrial control circuits requiring surge immunity.
5. Communication, data and signal line transient over-voltage protection.

4. Engineering Design Recommendations

1. Stand-off voltage selection: V_RWM (7.0V) must be equal to or greater than the DC or continuous peak operating voltage of the protected line, ensuring the device remains non-conductive under normal operation.
2. Clamping voltage check: Verify that the downstream IC's maximum withstand voltage exceeds the TVS clamping voltage (12.0V) at the expected surge current; otherwise select a lower V_RWM grade or add secondary protection.
3. PCB layout: Place the TVS as close as possible to the protected connector or port, with short, direct signal traces and a minimum ground-loop area to minimize lead parasitic inductance.
4. Power derating: When ambient temperature exceeds 25℃ or pulse width deviates from the standard 8/20μs waveform, derate P_PK per Fig.1 (peak pulse power vs. pulse width) and Fig.2 (temperature derating curve).
5. Surge duty cycle: I_FSM is specified for a single half-sine wave at a maximum of 4 pulses per minute; repetitive surges must be evaluated for average power dissipation and thermal margin.
6. Soldering process: Verify terminal solderability per MIL-STD-750 Method 2026; keep reflow profile within the SMB plastic body's thermal limits to avoid damage.
7. Bidirectional usage note: Although the CA bidirectional version tolerates polarity reversal, its forward-voltage characteristic in the reverse breakdown direction differs from unidirectional units; select accordingly for AC or bidirectional pulse scenarios.

5. Product Summary

SMBJ7.0CA is a 7.0V bidirectional, 600W-class SMB surface-mount TVS diode featuring a glass-passivated die, fast response, low clamping voltage (12.0V at 50A) and a UL94V-0 flame-retardant package. It is targeted at transient surge and ESD protection on low-voltage power rails and I/O interfaces. Design work should focus on matching V_RWM to the line operating voltage, coordinating clamping voltage with downstream device withstand ratings, and derating power under elevated temperature and wider pulse widths to ensure reliable protection across surge stress conditions.

About Slkor：

Slkor has research and development offices in Busan, South Korea, Beijing, China, and Suzhou, China. Most of the wafer manufacturing and packaging and testing are carried out within China. The company employs and collaborates with individuals and organizations worldwide, with a laboratory for product performance and reliability testing and a central warehouse located at its headquarters in Shenzhen. Slkor has filed for over a hundred invention patents, offers more than 2,000 product models, and serves over ten thousand customers globally. Its products are exported to countries and regions including Europe, the Americas, Southeast Asia, and the Middle East, making it one of the rapidly growing semiconductor companies in recent years. With well-established management systems and streamlined workflows, Slkor has rapidly enhanced the brand awareness and reputation of its "SLKOR" brand through its outstanding quality and standardized services. Its product range includes three major series: diodes, transistors, and power devices, with recent introductions of new products such as Hall elements and analog devices, expanding its presence in sensors, Risc-v microcontrollers, and other product categories.