Analog Devices Inc./Maxim Integrated MAX397CAI

Overview

The MAX397CAI from Maxim Integrated is a dual 8-channel CMOS analog multiplexer designed for precision signal routing in low-voltage systems. It delivers ≤100Ω on-resistance (max), ≤6Ω channel-to-channel R_ON matching, and <5pC charge injection - enabling high-fidelity switching in data acquisition and audio applications operating from +2.7V to +16V or ±2.7V to ±8V supplies.

For engineers reviewing the MAX397CAI datasheet, MAX397CAI pinout, MAX397CAI application, or MAX397CAI equivalent, this device supports dual independent 8-channel switching with TTL/CMOS-compatible control, low leakage (<1nA input off-leakage at +85°C), and guaranteed break-before-make timing - critical for avoiding signal shorting in multichannel sampling systems.

Technical Context

The MAX397CAI implements a fully differential dual-mux architecture: one COMA/NO1A–NO8A path and one COMB/NO1B–NO8B path, each independently addressable via shared A0–A2 and EN inputs. Its silicon-gate CMOS process ensures flat on-resistance over ±3.5V signal range (≤10Ω variation) and ESD robustness >2000V per Method 3015.7.

It operates across three supply configurations: single-ended (+2.7V to +16V, V− = GND), symmetric dual (±2.7V to ±8V), or asymmetric dual (e.g., +10V/−5V). Logic inputs accept 0.8V/2.4V thresholds regardless of supply mode, and transition time remains <250ns across −40°C to +85°C for the E-grade variant - though MAX397CAI is rated 0°C to +70°C.

Key Specifications

Pinout & Package

MAX397CAI is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.635mm pitch, 11.5mm × 5.3mm body, and exposed thermal pad (not electrically connected). Pin 1 is marked by a beveled corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog multiplexer applications.

Compared with MAX397CAI, MAX397CWI offers identical performance in a wider SO package ideal for thermal management, while ADG708BRUZ trades dual-channel capability for lower on-resistance and smaller size - making it viable only in single-bank, narrow-supply designs.

Availability

MAX397CAI is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, and audio signal routing requiring stable component supply across commercial temperature range (0°C to +70°C) and long-term production continuity.

Supply support for MAX397CAI 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 precision analog and mixed-signal ICs for demanding industrial, medical, and communications applications - emphasizing low noise, rail-to-rail operation, and robust reliability.

The MAX396/MAX397 product line targets high-accuracy analog signal routing where low charge injection, matched on-resistance, and wide supply flexibility are mandatory - especially in data acquisition and sensor interface systems.

FAQ

What is the maximum analog signal range supported by the MAX397CAI?

The MAX397CAI supports an analog signal range from V− to V+, meaning ±3.5V with ±5V supplies or 0V to +3.5V with +5V/V−=GND supplies. This range is guaranteed with ≤10Ω R_ON flatness and remains valid across the full 0°C to +70°C operating temperature range specified for the MAX397CAI grade.

Does the MAX397CAI require external pull-up resistors on its address lines A0–A2?

No, the MAX397CAI does not require external pull-ups on A0–A2. Its logic inputs have guaranteed 0.8V low and 2.4V high thresholds with input current <0.1µA across temperature, allowing direct connection to microcontroller GPIOs or FPGA outputs without additional components - a feature confirmed in the Electrical Characteristics table for MAX397CAI.

Can the MAX397CAI operate with unbalanced dual supplies, such as +12V and −5V?

Yes, the MAX397CAI supports unbalanced dual supplies like +12V/−5V, provided the total voltage difference (V+ − V−) does not exceed 17V and each rail stays within absolute maximum ratings (V+ ≤ +17V, V− ≥ −17V). The device maintains specified R_ON, leakage, and switching performance under such conditions, as validated in the Applications Information section.

Is the MAX397CAI pin-compatible with the MAX307 in the same SSOP package?

Yes, the MAX397CAI is pin-compatible with the MAX307 in the 28-pin SSOP package: identical pin count, function mapping (V+, V−, GND, EN, A0–A2, COMA/COMB, NO1A–NO8A/NO1B–NO8B), and mechanical footprint. This allows drop-in replacement without PCB modification - explicitly stated in the Benefits and Features section of the MAX397CAI datasheet.

What is the thermal resistance (θ_JA) of the MAX397CAI in its SSOP package?

The MAX397CAI in 28-pin SSOP has a junction-to-ambient thermal resistance (θ_JA) of 9.52°C/W, derived from its 762mW continuous power dissipation rating at +70°C ambient and 9.52mW/°C derating factor above that temperature. This value assumes standard JEDEC 2-layer board conditions and is documented in the Absolute Maximum Ratings table for the SSOP variant.