MAX9940：Signal-Line Overvoltage Protector for Low-Voltage Devices

Protects Low-Voltage Devices Using Sensitive Communication Protocols

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.

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

MAX9940: Block Diagram/Typical Application Circuit

Applications/Uses

Industrial Equipment
Notebook Computers
Portable Devices

DataSheet

title	Download file
MAX9940 Data Sheet	MAX9940.pdf

Parametrics

Part Number	Functions	Signal Path Leakage (±nA)	Analog Signal Range (V)	V_SUPPLY (V)	V_SUPPLY (Dual) (±V)	R_ON (Ω)	Fault Protect. (±V)	Package/Pins	Budgetary Price
Part Number	Functions	max	Analog Signal Range (V)	V_SUPPLY (V)	Dual	max	Fault Protect. (±V)	Package/Pins	See Notes
MAX9940	1-Line	5000	0 to +5.5	2.2 to 5.5	1.1 to 2.25	77.5	28	SC-70/5	$0.53 @1k