SP721ABTG - SP721 Lead-Free/Green Series

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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. 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. 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.

The SP721ABTG is an array of SCR/Diode bipolar structures for ESD and over-voltage protection to sensitive input circuits. The SP721 has 2 protection SCR/Diode device structures per input. There are a total of 6 available inputs that can be used to protect up to 6 external signal or bus lines. Over-voltage protection is from the IN (Pins 1 - 3 and Pins 5 - 7) to V+ or 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). 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+. A similar clamp to V- is activated if a negative pulse, one VBE less than V-, is applied to an IN input.

Features & Benefits:

  • ESD Interface Capability for HBM Standards: MIL STD 3015.7 - 15kV; IEC 61000-4-2, Direct Discharge; Single Input - 4kV (Level 2); Two Inputs in Parallel - 8kV (Level 4); IEC 61000-4-2, Air Discharge - 15kV (Level 4)
  • High Peak Current Capability: IEC 61000-4-5 (8/20μs) - ±3A; Single Pulse, 100μs Pulse Width - ±2A; Single Pulse, 4μs Pulse Width - ±5A
  • Designed to Provide Over-Voltage Protection: Single-Ended Voltage Range to - +30V; Differential Voltage Range to - ±15V
  • Fast Switching - 2ns Rise Time
  • Low Input Leakages - 1nA at 25°C Typical
  • Low Input Capacitance - 3pF Typical
  • An Array of 6 SCR/Diode Pairs
  • Operating Temperature Range - -40°C to 105°C


  • Microprocessor/Logic Input Protection
  • Data Bus Protection
  • Analog Device Input Protection
  • Voltage Clamp

URicon QVGQ2_E133083

pdficon ESD and Transient Protection Using the SP720 Application Note

This application note discusses ESD and transient protection using the SP720. For a given level of voltage or power there is a defined degree of protection compatible to that need. For the SP720 the protection circuits are designed to clamp over-voltage within a range of peak current that will substantially improve the survival input expectancy of average monolithic silicon circuits used for small signal and digital processing applications.

pdficon AN9734 IEC Electromagnetic Compatibility Standards for Industrial Process Measurement and Control Equipment

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.

pdficon ESD System Level Guide

Designers of today’s electronic devices have demanded more functionality with greater flexibility and higher levels of user interaction...

pdficon SP721 Series Datasheet

The SP721 is an array of SCR/Diode bipolar structures for ESD and over-voltage protection to sensitive input circuits...

pdficon Circuit Protection Technology Application Matrix

Littelfuse is the world leader in the design and manufacturing of fuses for the automotive industrial handheld computer and telecom markets...

pdficon SP720 SP721 and SP723 Turn-On and Turn-Off Characteristics Application Note

The purpose of this application note is to focus on customer concerns related to the fast switching characteristics of the SP720 SP721 and SP723 family of protection ICs during an ESD discharge. The SCR cell structures of this family were first introduced for ESD protection of sensitive ICs that were subject to substantially more severe conditions than normal Human Body Model stress.

pdficon Circuit Protection Products Selection Guide

Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
SP721ABTG 6 CH DIODE ARRAY SOIC8(TAPE&REEL) RoHS No 03/21/2011 PbFree No 03/01/2006 CoC_RoHS10_SP721ABTG REACH_SVHC Declaration_SP721ABTG.pdf No
Does not Contain IPC_SP721ABTG_EC
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