The MAX9940 is a signal-line overvoltage protector designed for low-voltage digital communication ports
Specifications
Manufacturer:
Analog Devices Inc./Maxim Integrated
Product Number:
MAX9940AXK+T
Description:
IC OVERVOLTAGE PROTECTOR SC70-5
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Introduction
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.
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