Asymmetrical TVS Diode for Extended Common-Mode RS-485

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Chinese manufacturing processes have undergone years of iteration, resulting in mature and reliable technologies. Many international corporations opt forproduction outsourcing in China.  As an electronic components manufacturer in China, our products can fully replace those of major international brands in 99% of applications without the need for testing verification. Our products boast high consistency in quality, reasonable pricing, ample inventory, flexible supply, short lead times, and professional after-sales service. 

Description
The SM712 transient voltage suppressor (TVS)diode is designed for asymmetrical (12V to -7V)protection in multi-point data transmission standardRS-485 applications. The SM712 may be used toprotect devices from transient voltages resultingfrom electrostatic discharge (ESD), electrical fasttransients (EFT), and lightning.The SM712 features 400 Watts (tp=8/20μs) ofpower handling capability to accommodate thehigher transient voltage levels which may beexpected in extended common mode applications.This provides higher equipment reliability andeliminates the “guess work” required when usingzener diodes that are not rated to handle suchtransient conditions.The integrated design aids in reducing voltageover-shoot associated with trace inductance. Thelow clamping voltage of the SM712 minimizes thestress on the protected transceiver. The SOT-23package allows flexibility in the design of “crowed”circuit boards. 

Features
● 400 watts peak pulse power (tp=8/20μs)
● Transient protection for asymmetrical datalines to
      IEC 61000-4-2 (ESD) ±15kV(air), ±8kV(contact)
      IEC 61000-4-4 (EFT) 40A (5/50ns)
      IEC 61000-4-5 (Lightning) 12A (8/20μs)
● Protects two +12V to -7V lines
● Low capacitance
● Low leakage current
● Low clamping voltage
● Solid-state silicon avalanche technology
● RoHS compliant 

Applications
● Protection of RS-485 transceivers withextended common-mode range
● Security systems
● Automatic Teller Machines
● HFC systems
● Networks