Diodes Incorporated SMBJ170CA-13-F

Summary of the SMBJ170CA-13-F Series TVS Diodes by Diodes Incorporated

The SMBJ170CA-13-F series from Diodes Incorporated is part of the broader SMBJ5.0(C)A – SMBJ200A family, delivering high-performance transient voltage suppression (TVS) for electronics systems in demanding environments. Designed in a compact, surface-mount SMB package, the SMBJ170CA-13-F offers designers robust protection against overvoltage transients such as those induced by lightning and ESD events. The diode is specifically rated for standoff voltages up to 170VWM and boasts a maximum clamp voltage of 275V, making it suitable for higher voltage rails and sensitive circuitry that require reliable safeguarding.

Attesting to its suitability for modern assemblies, the SMBJ170CA-13-F supports a peak pulse power dissipation of 600W and an impulse current capability of 2.2A (Ipp) in its compact form factor. Both unidirectional and bidirectional versions are available, facilitating flexible design choices for systems where bidirectional transient threats exist. Its glass-passivated die construction ensures enhanced reliability and stable performance under repeated stress, aligning with critical requirements in industrial control, telecommunications, and automotive electronics.

Primary Electrical Parameters of the SMBJ170CA-13-F

Engineers selecting a TVS diode like the SMBJ170CA-13-F must consider its electrical parameters in relation to expected circuit stress. The device delivers up to 600W of peak pulse power (using an 8/20µs waveform), with a standoff voltage of 170V (VWM) and a clamping voltage of 275V for rapid suppression of transient events. Its reverse breakdown voltage is tightly controlled through the die process, typically measured using a 10–15ms current pulse to guarantee reliable activation. The measured impulse current (Ipp) of 2.2A allows the SMBJ170CA-13-F to absorb significant energy surges without failure.

Available in both unidirectional and bidirectional variants (the “CA” suffix denotes bidirectional operation), the SMBJ170CA-13-F can protect circuits with differing voltage swing profiles. Its robust clamping capability ensures sensitive components downstream are safeguarded from voltage spikes above the maximum allowed value.

Physical Dimensions and Material Details of the SMBJ170CA-13-F

The SMBJ170CA-13-F is encapsulated in a molded plastic SMB (DO-214AA) package, which adheres to industry standards for surface-mount components. With an approximate weight of 0.1 grams, it supports high-density layouts and automated pick-and-place manufacturing. The case material is UL 94V-0 rated for flammability, minimizing fire hazards in case of prolonged electrical stress.

Terminals are finished with lead-free matte tin plating and are compatible with high-reliability soldering methods as defined in MIL-STD-202, Method 208 e3, supporting robust assembly integrity. The device is rated Moisture Sensitivity Level 1 per J-STD-020, allowing for straightforward storage and handling on modern production lines. As a “Green” component, the SMBJ170CA-13-F complies with RoHS requirements, is halogen- and antimony-free, and fulfills industry environmental protocols.

Thermal Performance and Power Capacity of the SMBJ170CA-13-F

Proper thermal management is critical to the performance and longevity of TVS diodes in real-world applications. The SMBJ170CA-13-F’s peak pulse rating assumes the terminals are kept at ambient temperature, supporting rapid energy dissipation during transient events. The device’s power derating curves enable engineers to assess allowable pulse energy across various temperatures, ensuring reliable deployment in applications up to the maximum junction temperature.

Standard engineering guidelines recommend careful pad layout to optimize thermal performance and minimize the risk of localized overheating. Reference package outline dimensions and recommended pad pattern are provided for accurate PCB design. It’s important to note the effect of repetitive pulse exposure on device lifetime; the SMBJ170CA-13-F maintains stability with a duty cycle of up to four pulses per minute, further supporting its use in systems with frequent transients.

Use Cases and Design Notes for the SMBJ170CA-13-F

The SMBJ170CA-13-F is engineered for use in circuit nodes exposed to transients typically found in power distribution, industrial panels, and communication interface protection. Its electrical ratings position it well for safeguarding AC/DC lines, relay contacts, and high-speed data links. When specifying the device, engineers should match the standoff voltage (170VWM) to the working voltage of the system and ensure the maximum clamping voltage remains within the tolerance of protected downstream semiconductors.

In automotive and industrial automation, the bidirectional nature of the SMBJ170CA-13-F (when specified as “CA”) is especially beneficial for AC circuits and differential signal lines. Application notes recommend placement as close as possible to the entry point of vulnerable traces to maximize response time. Its compatibility with automated reflow soldering and robust mechanical design further streamline integration into high-volume assemblies.

Alternative or Substitute Products for the SMBJ170CA-13-F

When evaluating alternatives to the SMBJ170CA-13-F, consider similar TVS diodes within the SMBJ5.0(C)A – SMBJ200A series offering different standoff voltages or clamping characteristics to match application requirements. Engineers might also review products from other manufacturers that meet the same mechanical/SMB package and support operation in the 170VWM–275VC range with at least 600W peak pulse capabilities. However, strict attention should be paid to package compatibility, marking format, and device orientation features (e.g., bidirectional capability and polarity indicators), as introduced in the SMBJ170CA-13-F documentation.

Conclusion

The SMBJ170CA-13-F series TVS diode from Diodes Incorporated offers a compelling solution for engineers in need of robust transient protection in high-voltage, surface-mount applications. With its strong electrical performance profile, lead-free construction, and well-documented mechanical standards, it fits seamlessly into contemporary electronics systems requiring reliable overvoltage suppression. Thorough consideration of its electrical, thermal, and mechanical specifications will ensure optimal device selection and system resilience in real-world engineering deployments.