Analog Devices Inc./Maxim Integrated MAX337CWI+

Overview

MAX337CWI+ from Maxim Integrated is a dual 8-channel CMOS analog multiplexer designed to route one of eight differential input pairs (NO1A–NO8A/NO1B–NO8B) to two common bidirectional outputs (COMA/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 automated test equipment and data acquisition systems.

For engineers reviewing the MAX337CWI+ datasheet, MAX337CWI+ pinout, MAX337CWI+ application, or MAX337CWI+ equivalent, key selection criteria include its rail-to-rail bidirectional signal handling, TTL/CMOS-compatible control inputs across full temperature range, guaranteed low charge injection for minimal settling error, and ESD protection >2000V per Method 3015.7.

Technical Context

The MAX337CWI+ implements a dual independent 8:1 analog mux 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 symmetrical conduction in both directions.

All digital inputs (A0–A2, EN) are TTL/CMOS-compatible (0.8V to 2.4V thresholds) over the full 0°C to +70°C operating range and ±4.5V to ±18V supply window. The device supports unbalanced supplies (e.g., +24V/–5V), with absolute maximum V+–V– differential limited to 44V.

Key Specifications

Pinout & Package

MAX337CWI+ uses a 28-pin Wide SO (W28+6) package with 300-mil body width, RoHS-compliant lead-free finish, and standard SOIC thermal and mechanical footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX337CAI+, the MAX337CWI+ offers superior thermal dissipation and easier rework due to wider SO pitch, while ADG507AKRZ trades leakage and charge injection performance for broader vendor availability-making MAX337CWI+ optimal for metrology-grade designs requiring verified low-error switching.

Availability

MAX337CWI+ is available at Aetrix Electronics and suitable for precision data acquisition, automated test equipment, and medical instrumentation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MAX337CWI+ 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, medical, and communications markets.

The MAX336/MAX337 family was engineered for low-leakage, low-charge-injection analog signal routing in precision measurement systems-prioritizing parameter guarantees (e.g., 3.5pC charge injection, <20pA leakage) over generic switching speed.

FAQ

What supply configurations does the MAX337CWI+ support?

The MAX337CWI+ supports three supply modes: dual ±4.5V to ±20V, single +4.5V to +30V (with V− tied to GND), and unbalanced supplies like +24V/−5V. The absolute maximum V+–V− differential is 44V. All configurations maintain TTL/CMOS-compatible logic thresholds and full rail-to-rail analog signal range from V− to V+.

How does the MAX337CWI+ handle bidirectional signal flow?

The MAX337CWI+ conducts equally well in both directions-its CMOS switch architecture ensures identical on-resistance, leakage, and capacitance whether signal flows from NOx to COMA/COMB or vice versa. This enables flexible use as a multiplexer, demultiplexer, or analog bus switch without performance penalty.

Is the MAX337CWI+ pin-compatible with the industry-standard DG507?

Yes-the MAX337CWI+ is explicitly designed as a pin-compatible upgrade for the DG507. It uses the same 28-pin Wide SO footprint and identical pin functions (e.g., V+, V−, COMA, COMB, NO1A–NO8A, NO1B–NO8B, A0–A2, EN, GND), allowing direct replacement without PCB modification.

What is the guaranteed charge injection specification for the MAX337CWI+?

The MAX337CWI+ guarantees 3.5pC typical charge injection (tested at TA = +25°C, CL = 100pF, RS = 0Ω), with a maximum of 10pC. This low value minimizes voltage glitches on sampling capacitors-critical for precision data acquisition where settling error must be <0.001% of full scale.

Does the MAX337CWI+ require external ESD protection in typical applications?

No-MAX337CWI+ incorporates >2000V ESD protection per Method 3015.7 on all pins, validated during production testing. This eliminates the need for external TVS diodes in most industrial and benchtop applications, though system-level ESD compliance (e.g., IEC 61000-4-2) still requires board-level design attention.