This application note discusses the purpose of the International Electrotechnical Commission lEC 61000-4 (previously known as lEC-801) standard which established a common reference for evaluating the performance of industrial-process measurement and control instrumentation when exposed to electric or electromagnetic interference.ĮC606 Protecting the Universal Serial Bus from Over Voltage and Overcurrent Threats A similar clamp to V- is activated if a negative pulse, one VBE less than V-, is applied to an IN input.ĪN9734 IEC Electromagnetic Compatibility Standards for Industrial Process Measurement and Control Equipment From an IN input, a clamp to V+ is activated if a transient pulse causes the input to be increased to a voltage level greater than one VBE above V+. The SCR structures are designed for fast triggering at a threshold of one +VBE diode threshold above V+ (Pin 8) or a –VBE diode threshold below V- (Pin 4). Overvoltage protection is from the IN (Pins 1-3 and Pins 5-7) to V+ or V.
There are a total of 6 available inputs that can be used to protect up to 6 external signal or bus lines. The SP723 has 2 protection SCR/Diode device structures per input. The SP723 is an array of SCR/Diode bipolar structures for ESD and overvoltage protection of sensitive input circuits. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation.
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