The MAX9940 is a signal-line overvoltage protector designed for low-voltage digital communication ports

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Product Description

MAX9940 Signal-Line Overvoltage Protector

The MAX9940 is a signal-line overvoltage protector designed for low-voltage digital communication ports. It protects sensitive circuits against high-voltage faults and ESD events while preserving signal integrity for 1‑Wire® and other low-voltage serial buses.

Key Specifications

Operating Voltage	2.2V to 5.5V
Overvoltage Protection	Up to 28V on external signal line
ESD Protection	±4kV IEC 61000‑4‑2 contact
Fault Response Time	Typically 60ns
Quiescent Current	Typically 13µA
Operating Temperature	−40°C to +125°C
Package	5-pin SC70

Key Features

Overvoltage protection up to 28V on external signal line
±4kV IEC 61000‑4‑2 contact ESD protection
Fast fault response: typically 60ns
Internal low-resistance series switch
Isolates low-voltage MCUs and ICs from fault voltages
Ultra-low quiescent current: typically 13µA
Single supply operation: 2.2V to 5.5V
Automotive temperature range: −40°C to +125°C

Applications

1‑Wire® and I2C communication bus protection
Low-voltage microcontroller I/O port protection
Portable electronics and battery-powered devices
Industrial control and automation systems
Automotive sensor and infotainment interfaces
Medical handheld and portable equipment
Notebook computers and consumer electronics

Designed for space-constrained and automotive environments, the MAX9940 provides robust protection while maintaining excellent signal integrity for critical communication interfaces.