Analog Devices Inc./Maxim Integrated MAX12935BAWE+

Overview

MAX12935BAWE+ from Analog Devices is a dual-channel, bidirectional digital galvanic isolator in a 16-pin wide-body SOIC package, rated for 5kVRMS isolation (60s), 200Mbps data rate, and operating across -40°C to +125°C ambient. It isolates TX/RX lines in isolated transceivers using opposite-direction channel configuration, with independent 1.71V–5.5V supplies per side for level translation.

For engineers reviewing the MAX12935BAWE+ datasheet, MAX12935BAWE+ pinout, MAX12935BAWE+ application, or MAX12935BAWE+ equivalent, key selection criteria include channel directionality (A→B & B→A), default-low output state, CMTI ≥50kV/µs, 200Mbps capability at 1.8V–5.5V supply, and UL/cUL safety certification for industrial and medical isolation.

Technical Context

The MAX12935BAWE+ implements two unidirectional isolation channels operating in opposite directions - OUT1 driven by IN2 (Side A input → Side B output) and OUT2 driven by IN1 (Side B input → Side A output) - enabling full-duplex UART/RS-485 isolation. Its proprietary capacitive isolation barrier supports 5kVRMS withstand, 848VRMS continuous working voltage (VIOWM), and ±10kV surge immunity (1.2/50µs).

It features independent undervoltage lockout (UVLO) on both VDDA and VDDB (threshold 1.5–1.66V, hysteresis 45mV), push-pull outputs eliminating external pull-ups, and refresh circuitry ensuring stable output during indefinite DC input states. Propagation delay is 4.1–20.3ns (typical 5.4–10.9ns), with channel-to-channel skew ≤2ns for opposite-direction operation.

Key Specifications

Pinout & Package

Package: 16-pin wide-body SOIC (W16MS-11), creepage/clearance ≥8mm, CTI >600 (Group I), RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital isolator applications.

Compared with SI8622ED-B-IS and ISO6721FDWR, the MAX12935BAWE+ delivers higher speed (200Mbps vs. 50–200Mbps), guaranteed default-low behavior without external components, and tighter propagation delay skew (≤2ns), making it optimal for timing-critical full-duplex isolation where output state predictability is essential.

Availability

MAX12935BAWE+ is available at Aetrix Electronics and suitable for industrial fieldbus nodes, isolated RS-485 transceivers, and battery management systems requiring stable component supply, long-term lifecycle support, and certified safety isolation.

Supply support for MAX12935BAWE+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The MAX12935BAWE+ belongs to the MAX1293x family of high-speed digital isolators designed specifically for robust galvanic isolation in harsh electromagnetic environments - emphasizing low power, precise timing, and safety compliance for industrial and medical systems.

FAQ

What is the maximum data rate supported by the MAX12935BAWE+?

The MAX12935BAWE+ supports a maximum data rate of 200Mbps under conditions of 2.25V–5.5V supply voltage. At 1.71V–1.89V supply, the maximum data rate is 150Mbps. This performance is enabled by its proprietary capacitive isolation architecture and optimized driver/receiver design, making the MAX12935BAWE+ suitable for high-speed isolated serial interfaces such as RS-485 and SPI.

Does the MAX12935BAWE+ require external pull-up or pull-down resistors on its outputs?

No, the MAX12935BAWE+ does not require external pull-up or pull-down resistors. Its outputs use push-pull drivers capable of directly driving TTL and CMOS logic inputs. The device features a default-low output state, meaning outputs assume a logic-low level when inputs are unpowered or open-circuited - a built-in fail-safe behavior that eliminates reliance on external biasing components for the MAX12935BAWE+.

How does the MAX12935BAWE+ handle undervoltage conditions on its power supplies?

The MAX12935BAWE+ monitors both VDDA and VDDB independently for undervoltage lockout (UVLO). When either supply drops below 1.5–1.66V (with 45mV hysteresis), all outputs immediately transition to their default-low state regardless of input conditions. This behavior is documented in Table 3 of the datasheet and ensures predictable, safe operation during brown-out or asymmetric power sequencing - a critical feature for reliability in the MAX12935BAWE+.

Can the MAX12935BAWE+ be used for level translation between different logic families?

Yes, the MAX12935BAWE+ supports level translation between logic families via independent VDDA (1.71V–5.5V) and VDDB (1.71V–5.5V) supplies. For example, it can translate 1.8V microcontroller signals to 5V transceiver logic while maintaining galvanic isolation. Input thresholds scale with supply voltage (e.g., VIH = 0.7 × VDD_), and outputs swing rail-to-rail - enabling interoperability across LVCMOS, LVTTL, and CMOS domains without additional level-shifting circuitry in the MAX12935BAWE+.

What safety certifications does the MAX12935BAWE+ hold?

The MAX12935BAWE+ is certified to UL 1577 (5000VRMS, 1s test) and CSA Bulletin 5A (cUL), with file number E351759. It meets IEC 60747-5-5 requirements for reinforced insulation, including 5kVRMS withstand voltage (60s), 848VRMS maximum working voltage (VIOWM), and 10kV surge rating (1.2/50µs). These certifications validate its suitability for safety-critical applications including industrial control and medical devices - core attributes of the MAX12935BAWE+.