SP721 Series - SCR/Diode Array for ESD and Overvoltage Protection

The SP721 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 orbus 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:

  • 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

Applications:

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

Access specifications, certifications, check availability and order parts below

Catalog #Standoff
Voltage
(V)
ESD Contact
(kV)
ESD Air
(kV)
Lightning
Immunity
(8x20μs)
(A)
CI/OTYP
(pF)
SizePolarityChannelsMountingPublic part (Yes/No)StockCompare
SP721AB
Obsolete: 2008-05-08
Replaced By: SP721ABG
3041533SOIC-8Bipolar6Surface MountYesCheck
SP721ABT
Obsolete: 2008-05-08
Replaced By: SP721ABTG
3041533SOIC-8Bipolar6Surface MountYesCheck
SP721AP
Obsolete: 2008-05-08
Replaced By: SP721APP
3041533PDIP-8Bipolar6Through HoleYesCheck

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