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Signal-Line Overvoltage Protector for Low-Voltage Devices

Protects Low-Voltage Devices Using Sensitive Communication Protocols

Product Details

Key Features

Applications/Uses

Parametric specs for Signal-Line Protectors
Functions 1-Line
Signal Path Leakage (±nA) (max) 5000
Analog Signal Range (V) 0 to +5.5
VSUPPLY (V) 2.2 to 5.5
VSUPPLY (Dual) (±V) (Dual) 1.1 to 2.25
RON (Ω) (max) 77.5
Fault Protect. (±V) 28
Package/Pins SC70/5
Budgetary
Price (See Notes)
$0.56 @1k
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Simplified Block Diagram

Technical Docs

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Parameters

Parametric specs for Signal-Line Protectors
Functions 1-Line
Signal Path Leakage (±nA) (max) 5000
Analog Signal Range (V) 0 to +5.5
VSUPPLY (V) 2.2 to 5.5
VSUPPLY (Dual) (±V) (Dual) 1.1 to 2.25
RON (Ω) (max) 77.5
Fault Protect. (±V) 28
Package/Pins SC70/5
Budgetary
Price (See Notes)
$0.56 @1k

Key Features

  • 28V Protection on EXT
  • Extended ESD Protection
    • ±4kV IEC 61000-4 Contact on EXT
  • +2.2V to +5.5V Supply Voltage Range
  • 13µA Quiescent Supply Current
  • 60ns Fault Reaction Time
  • Small, 5-Pin SC70
  • -40°C to +125°C Temperature Range

Applications/Uses

  • Industrial Equipment
  • Notebook Computers
  • Portable Devices

Description

The MAX9940 signal-line overvoltage protector for low-voltage digital communication ports provides protection against high-voltage faults and ESD strikes. The MAX9940 is especially useful for sensitive communication protocols such as Maxim 1-Wire® that cannot afford standard means of fault protection, such as large series resistors or large line capacitances.

The MAX9940 operates from a single supply voltage of +2.2V to +5.5V and consumes only 13µA of quiescent supply current. The EXT port is protected up to 28V. The device features a reaction time of 60ns for fast action during fault conditions and operates over the -40°C to +125°C automotive temperature range.

Simplified Block Diagram

MAX9940: Block Diagram/Typical Application Circuit MAX9940: Block Diagram/Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .