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MAX12931BASA+

ADIMAX12931BASA+

Analog Devices Inc./Maxim Integrated
General Purpose Digital Isolator 3750Vrms 2 Channel 25Mbps 50kV/µs (Typ) CMTI 8-SOIC (0.154", 3.90mm Width)
NRND3,773 in stock
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Overview

The MAX12931BASA+ is a two-channel, 3.75kVrms digital galvanic isolator utilizing proprietary capacitive coupling technology to bridge different ground potentials safely. It supports data rates up to 25Mbps with one channel in each direction (1/1 configuration), providing high-speed communication while maintaining 50kV/us typical common-mode transient immunity. The device operates from a wide 1.71V to 5.5V supply range, making it ideal for interfacing low-voltage microcontrollers with higher-voltage industrial systems.

Why Choose This Part

This isolator features remarkably low power consumption, drawing only 0.8mA per channel at 12.5MHz when powered at 3.3V. Its wide supply voltage range down to 1.71V eliminates the need for level shifters when working with modern low-power MCUs. Additionally, the high CMTI of 50kV/us ensures robust data integrity in environments with significant electrical noise or fast-switching power electronics.

Applications

Isolated RS-485/RS-422 Communication
Protects transceivers and logic-side controllers from ground loops and surges in long-distance industrial bus networks.
Industrial Automation
Used in PLC I/O modules to isolate field-side sensors and actuators from sensitive processing electronics.
Battery Management Systems
Provides high-voltage isolation between battery cell monitoring ICs and the primary system controller in energy storage systems.
Isolated SPI/UART Interfacing
Facilitates high-speed data exchange between subsystems operating at different voltage rails or ground references.

Key Specifications

Type General Purpose
Data Rate 25Mbps
Technology Capacitive Coupling
Channel Type Unidirectional
Mounting Type Surface Mount
Isolated Power No
Package / Case 8-SOIC (0.154", 3.90mm Width)
Voltage - Supply 1.71V ~ 5.5V
Number of Channels 2
Voltage - Isolation 3750Vrms
Operating Temperature -40degC ~ 125degC
Inputs - Side 1/Side 2 1/1
Rise / Fall Time (Typ) 1.6ns, 1.4ns (Max)
Supplier Device Package 8-SOIC
Pulse Width Distortion (Max) 4ns
Propagation Delay tpLH / tpHL (Max) 32.5ns, 33.6ns
Common Mode Transient Immunity (Min) 50kV/us (Typ)

Getting Started

To evaluate this device, use the MAX12931WEVKIT# evaluation kit, which provides a pre-assembled PCB for testing timing parameters and CMTI performance. Ensure that bypass capacitors of 0.1uF are placed as close as possible to the VDDA and VDDB pins on both sides of the isolation barrier. When designing the PCB layout, maintain the required creepage and clearance distances under the 8-SOIC package to satisfy safety certifications.

MAX12931 Family

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

Part Number Data Rate Voltage - Isolation Pulse Width Distortion (Max) Propagation Delay tpLH / tpHL (Max) Common Mode Transient Immunity (Min) Stock
MAX12931BASA+ (this part) 25M 3750V 4ns 32.5ns, 33.6ns 50kV 3,773
MAX12931FASA+ 150M 3000V 2ns 9.2ns, 9.4ns 50kV 2,360