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MAX14931AASE+

ADIMAX14931AASE+

Analog Devices Inc./Maxim Integrated
General Purpose Digital Isolator 2750Vrms 4 Channel 1Mbps 25kV/µs (Typ) CMTI 16-SOIC (0.295", 7.50mm Width)
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Overview

The MAX14931AASE+ is a four-channel digital isolator designed to provide 2750Vrms of galvanic isolation between circuits while consuming minimal power. This variant features a 3-forward and 1-reverse channel configuration, supporting data rates up to 1Mbps with a default-high output state. It utilizes capacitive coupling technology to ensure robust signal integrity and high common-mode transient immunity (CMTI) of 25kV/us.

Why Choose This Part

This isolator offers a wide supply voltage range from 1.71V to 5.5V, allowing for seamless level shifting between different logic levels. Its low power consumption of approximately 2.6mA per channel at 3.3V makes it suitable for power-sensitive designs, while the narrow 16-SOIC package saves valuable PCB real estate compared to wide-body alternatives.

Applications

Industrial Fieldbus Isolation
Ideal for isolating RS-485, RS-232, or CAN bus interfaces in harsh industrial environments to prevent ground loops.
Isolated SPI Communication
Provides the necessary 3/1 channel split to handle SPI signals (SCLK, MOSI, CS in one direction and MISO in the other) across an isolation barrier.
Battery Management Systems
Safely bridges high-voltage battery monitoring circuits and low-voltage microcontrollers in energy storage systems.
Medical Equipment
Used in patient monitoring or diagnostic tools where 2750Vrms isolation is required for safety and signal protection.

Key Specifications

Type General Purpose
Data Rate 1Mbps
Technology Capacitive Coupling
Channel Type Unidirectional
Mounting Type Surface Mount
Isolated Power No
Package / Case 16-SOIC (0.295", 7.50mm Width)
Voltage - Supply 1.71V ~ 5.5V
Number of Channels 4
Voltage - Isolation 2750Vrms
Operating Temperature -40degC ~ 125degC
Inputs - Side 1/Side 2 3/1
Rise / Fall Time (Typ) 2ns, 2ns
Supplier Device Package 16-SOIC
Pulse Width Distortion (Max) 4.5ns
Propagation Delay tpLH / tpHL (Max) 54.1ns, 55.3ns
Common Mode Transient Immunity (Min) 25kV/us (Typ)

Getting Started

To evaluate this device, use the MAX14931WEVKIT evaluation kit which provides a pre-populated board for testing timing and isolation characteristics. Ensure that bypass capacitors (0.1uF) are placed as close as possible to the VDD pins on both sides of the isolation barrier to maintain signal integrity. For high-speed designs exceeding 1Mbps, consider the B or C speed grades within the same family.

MAX14931 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Data Rate Package Pulse Width Distortion (Max) Propagation Delay tpLH / tpHL (Max) Stock
MAX14931AASE+ (this part) 1M SOIC-16 4.5ns 54.1ns, 55.3ns 269
MAX14931EASE+ 25M SOIC-16 2.6ns 27.5ns, 28.8ns 10,630
MAX14931FASE+T 150M SOIC-16 1ns 7.5ns, 7.4ns 18,003
MAX14931FASE+ 150M SOIC-16 1ns 7.5ns, 7.4ns 5,062

Also Consider

ADuM141E ADIAnalog Devices Inc. - Uses iCoupler transformer technology which may offer different EMI characteristics and supports higher data rates.