Analog Devices Inc./Maxim Integrated MAX337CAI+

Overview

MAX337CAI+ from Maxim Integrated is a dual 8-channel CMOS analog multiplexer designed to route one of eight differential inputs (NO1A–NO8A and NO1B–NO8B) to respective common outputs (COMA and COMB) using a 3-bit binary address. It operates from ±4.5V to ±20V dual supplies or +4.5V to +30V single supply, features 400Ω max on-resistance, <20pA NO-off leakage at +25°C, and 3.5pC typical charge injection - enabling precision signal routing in test equipment and data acquisition systems.

For engineers reviewing the MAX337CAI+ datasheet, MAX337CAI+ pinout, MAX337CAI+ application, or MAX337CAI+ equivalent, key selection considerations include bidirectional rail-to-rail signal handling, TTL/CMOS-compatible control inputs, guaranteed low charge injection for minimal settling error, ESD protection >2000V, and compatibility with industry-standard DG506/DG507 replacements in SSOP-28 packaging.

Technical Context

The MAX337CAI+ implements a dual independent 8:1 analog multiplexer architecture with separate A- and B-side channels, each controlled by shared A0–A2 address lines and individual EN enable inputs. Its BiCMOS process enables low leakage (<50pA on-channel, <20pA off-channel at +25°C) and high-voltage tolerance (±20V dual / +30V single supply).

All digital inputs are TTL/CMOS-compatible across full temperature range (0°C to +70°C) and supply ranges (±4.5V to ±18V), supporting robust logic interfacing. The device supports break-before-make switching with ≤50ns interval and <500ns transition time, ensuring minimal signal crosstalk and transient coupling during channel changes.

Key Specifications

Pinout & Package

MAX337CAI+ is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, RoHS-compliant and lead-free (+ suffix). The package is thermally and mechanically optimized for surface-mount assembly in space-constrained precision analog layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX337CWI+, the MAX337CAI+ offers identical functionality in a smaller SSOP package ideal for space-constrained designs, while ADG507AKRZ trades leakage performance and ESD protection for broader availability - making MAX337CAI+ optimal for high-fidelity test and measurement applications demanding guaranteed low-error switching.

Availability

MAX337CAI+ is available at Aetrix Electronics and suitable for precision data acquisition, automated test equipment, and industrial process monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MAX337CAI+ 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX336/MAX337 family was engineered for low-leakage, low-charge-injection analog signal routing in precision instrumentation - targeting applications where signal integrity, thermal stability, and long-term reliability are critical.

FAQ

What is the maximum operating temperature range for the MAX337CAI+?

The MAX337CAI+ is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade temperature range is validated across all electrical parameters in the datasheet, including leakage current, on-resistance, and switching times. The device uses a BiCMOS process to maintain stability within this range, and derating is not required up to +70°C. For extended temperature operation, consider the MAX337EAI+ (−40°C to +85°C) variant.

Does the MAX337CAI+ support single-supply operation, and how is it configured?

Yes, the MAX337CAI+ supports single-supply operation from +4.5V to +30V. To configure it, connect V− (pin 27) to GND (pin 12), apply the positive supply to V+ (pin 1), and ensure all analog signals remain within 0V to V+ - e.g., 0V to +12V for a +12V supply. Control inputs (A0–A2, EN) remain TTL/CMOS-compatible. This configuration preserves rail-to-rail signal handling and all specified leakage and resistance performance.

Is the MAX337CAI+ pin-compatible with the DG507, and what does that mean for PCB design?

Yes, the MAX337CAI+ is explicitly documented as a plug-in upgrade for the DG507, with identical pinout and function mapping in the 28-pin SSOP package. That means no PCB layout changes are needed when replacing DG507 - all signals (V+, V−, COMA, COMB, NOxA/NOxB, A0–A2, EN, GND) align directly. Electrical improvements (lower leakage, lower charge injection, higher ESD rating) are realized immediately without hardware modification.

What is the significance of "Rail-to-Rail®" in the MAX337CAI+ datasheet?

"Rail-to-Rail®" indicates the MAX337CAI+ can pass analog signals from V− to V+ without clipping - i.e., full supply swing capability. For example, with ±15V supplies, signals from −15V to +15V pass unattenuated; with +12V/V− = GND, signals from 0V to +12V are supported. This eliminates external level-shifting circuitry in many applications and is enabled by Maxim's proprietary BiCMOS process, not generic rail-to-rail op-amp architecture.

How does the MAX337CAI+ handle differential signal routing, and what are the key layout considerations?

The MAX337CAI+ routes differential pairs via its dual independent 8:1 structure: NO1A–NO8A feed COMA, and NO1B–NO8B feed COMB. For optimal common-mode rejection, route A- and B-side traces as matched-length differential pairs, keep COMA/COMB outputs physically separated, and avoid sharing return paths. The device's <86dB crosstalk and >82dB off-isolation are measured under these conditions - layout adherence ensures those specs are achieved in-system.