Analog Devices Inc./Maxim Integrated MAX22345SAAP+

Overview

MAX22345SAAP+ from Maxim Integrated is a reinforced 4-channel digital galvanic isolator with 200Mbps maximum data rate, 3.75kVRMS withstand voltage (60s), and 50kV/μs CMTI. It features active-low output enable on Side A, pin-selectable output default states (high/low), and independent 1.71V–5.5V dual supplies-enabling use in isolated SPI bus port control, industrial fieldbus interfaces, and battery management systems.

For engineers reviewing the MAX22345SAAP+ datasheet, MAX22345SAAP+ pinout, MAX22345SAAP+ application, or MAX22345SAAP+ equivalent, this page delivers verified electrical specs, isolation safety ratings, timing behavior across supply voltages, and real-world design context for high-speed, low-power, reinforced isolation in harsh environments.

Technical Context

The MAX22345SAAP+ implements Maxim's proprietary silicon-based reinforced isolation barrier, supporting bidirectional signal transfer across two independently powered domains (Side A: VDDA/GNDA; Side B: VDDB/GNDB). Its architecture includes integrated input pullup/pulldown networks (±1.5–10µA), programmable output defaults via DEFA/DEFB pins, and ENA (active-low) / ENB (active-high) enable logic-optimized for shared SPI bus MISO isolation where chip select directly controls output enable.

It operates across -40°C to +125°C ambient, with propagation delays as low as 4.1ns (tPLH, 4.5–5.5V), pulse width distortion ≤2.0ns, and channel-to-channel skew ≤2.0ns-ensuring deterministic timing in high-speed digital interfaces like isolated RS-485 transceivers and CAN nodes requiring tight synchronization.

Key Specifications

Pinout & Package

Package: 20-pin SSOP (5.5mm creepage/clearance), RoHS-compliant, surface-mount. Thermal resistance θJA = 84°C/W (4-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si8642ED-IS and ADUM4402BRIZ, the MAX22345SAAP+ uniquely combines 200Mbps speed, 1.8V operation, active-low ENA, and pin-selectable defaults-making it the only option among the three that natively supports direct, inverter-free integration into 1.8V SPI master-slave architectures with robust default-state control.

Availability

MAX22345SAAP+ is available at Aetrix Electronics and suitable for isolated SPI interfaces, industrial fieldbus nodes, and battery management systems requiring stable component supply, long-term lifecycle assurance, and compliance with reinforced isolation standards.

Supply support for MAX22345SAAP+ 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

Maxim Integrated (now part of Analog Devices) designs high-performance analog and mixed-signal ICs for industrial, automotive, communications, and healthcare applications.

The MAX22344–MAX22346 family was engineered specifically for high-speed, low-power, reinforced digital isolation in space-constrained, thermally sensitive, and safety-critical systems-emphasizing 200Mbps capability, 1.8V operability, and configurable enable/default logic.

FAQ

What is the maximum data rate supported by the MAX22345SAAP+?

The MAX22345SAAP+ supports a maximum data rate of 200Mbps under 2.25V–5.5V supply conditions. At lower supplies (1.71V–2.25V), the guaranteed maximum drops to 150Mbps. This rating is validated across the full -40°C to +125°C operating temperature range and applies to all four channels simultaneously with CL = 15pF loads.

Does the MAX22345SAAP+ support 1.8V operation on both sides?

Yes, the MAX22345SAAP+ supports independent 1.71V to 5.5V supplies on both Side A (VDDA/GNDA) and Side B (VDDB/GNDB). It is fully specified down to 1.8V, including propagation delay (7.1–20.3ns), power consumption (0.66mW/channel @ 1Mbps), and logic thresholds-enabling direct interfacing with 1.8V FPGAs and microcontrollers without level translation.

What is the function of the DEFA and DEFB pins on the MAX22345SAAP+?

The DEFA and DEFB pins on the MAX22345SAAP+ set the default output state (high or low) when the corresponding input is unpowered or open-circuited. Tying DEFA/DEFB to VDD_ selects high default; tying to GNDA/GNDB selects low default. This eliminates external pull resistors and prevents undefined states during power-up, brownout, or signal loss-critical for fail-safe industrial control.

How does the active-low ENA pin benefit SPI isolation in the MAX22345SAAP+?

The active-low ENA pin on the MAX22345SAAP+ allows direct connection to a microcontroller's chip select (CS) signal in SPI systems. When CS goes low to select a peripheral, ENA enables the MISO output-eliminating the need for an external inverter. This simplifies layout, reduces component count, and ensures precise timing alignment between CS assertion and data availability on MISO.

What safety certifications apply to the MAX22345SAAP+?

The MAX22345SAAP+ is certified for reinforced isolation per VDE 0884-11, UL 1577 (3750VRMS, 60s), and CSA Bulletin 5A. It achieves VIOWM = 784VRMS continuous working voltage and withstands ±10kV surge (1.2/50μs) between GNDA and GNDB. These ratings are production-tested and documented in the device's insulation characteristics table (Table 1).