The MAX9940 is a signal-line overvoltage protector intended for low-voltage digital communication ports. It guards sensitive circuits against high-voltage faults and ESD events while maintaining signa
Specifications
Manufacturer:
Analog Devices Inc./Maxim Integrated
Product Number:
MAX9940AXK+T
Description:
IC OVERVOLTAGE PROTECTOR SC70-5
Highlight:
MAX9940 signal-line overvoltage protector
,low-voltage digital communication protector
,ESD protection integrated circuit
Introduction
MAX9940AXK+T 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 maintaining signal integrity. Optimized for 1‑Wire® and other low-voltage serial buses, this device offers fast overvoltage detection, ultra-low quiescent current, and high ESD immunity.
Product Specifications
| Supply Voltage Range | 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 |
| Operating Temperature | −40°C to +125°C |
| Package | 5-pin SC70 |
Key Features
- 28V overvoltage protection 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
The MAX9940 integrates an internal low on-resistance series switch and is available in a compact 5-pin SC70 package, making it ideal for space-constrained applications and automotive systems operating from −40°C to +125°C.
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