📌 What is a SM712 Diode?

The SM712 TVS diode array is an asymmetrical ±12V to −7V ESD protection device specifically engineered for differential data transmission.

It clamps transient voltages during ESD, EFT and surge events, ensuring reliable communication in harsh electrical environments. With ultra-low clamping voltage and <1ns response time, the SM712 offers robust protection for RS-485, RS-422, RS-232, CAN and other multipoint data networks.


📌 SM712 Features

  • 400W Peak Pulse Power (8/20μs) per line
  • Protects two +12V / −7V communication lines
  • Ultra-fast transient response: <1ns
  • Ultra-low leakage and clamping characteristics
  • IEC61000-4-2 ESD protection up to ±25kV (air)
  • IEC61000-4-4 EFT protection up to 40A
  • Moisture Sensitivity Level: 1
  • Weight: 8mg approx.


📌 SM712 Applications

  • Protection of RS-485 & RS-422 transceivers
  • ATM terminals & banking electronics
  • Security & access control systems
  • HFC communication equipment
  • Industrial networks
  • Smart controllers and PLCs
  • IoT gateways
  • Building automation systems

🔁 SM712 Equivalent & Replacement

The SM712 is fully compatible with equivalents including:

It can be drop-in replaced in PCB designs where the SM712 pinout is standardized.

🔗 Related Products

  • SM05 – Low-voltage digital signal ESD protection
  • SMF05C – 5-channel ESD array for USB & HDMI
  • SMBJ12CA – Power surge protection for DC rails
  • CAN BUS TVS series – ESD protection specially for CAN & automotive data networks

For samples (free), pricing, bulk orders, stable supply & engineering support, contact Semiware.👉https://en.semiware.com/
We support:
✔ Flexible MOQs
✔ Short lead times
✔ Long-term supply security
✔ Technical application assistance

🔎 FAQs

  • Q: Is the SM712 suitable for RS-485?
    A: Yes — it is specifically designed to protect the differential bus lines of RS-485/RS-422 networks.
  • Q: Can SM712 replace SM05?
    A: Only in RS-485-type data bus applications. SM05 is for lower-voltage signal protection.
  • Q: Does SM712 affect signal integrity?
    A: No — it has low capacitance and ultra-low leakage, ensuring minimal impact.
  • Q: What’s the main difference between SM712 and SMBJ diodes?
    A: SMBJ devices protect power lines; SM712 protects differential data lines.
  • Q: Does Semiware support engineering samples?
    A: Yes — we provide free samples for evaluation and prototyping.