Analog Devices Inc./Maxim Integrated MAX379EWG+

Overview

MAX379EWG+ from Maxim Integrated is a 4-channel differential (2-of-8) fault-protected analog multiplexer with ±60V continuous input tolerance under ±15V supplies, <2mW power dissipation, break-before-make switching, and TTL/CMOS-compatible digital inputs. It serves as a high-reliability signal routing device in industrial data acquisition front ends where sensor overvoltage and power-loss scenarios are common.

For engineers reviewing the MAX379EWG+ datasheet, MAX379EWG+ pinout, MAX379EWG+ application, or MAX379EWG+ equivalent, this page delivers verified specifications, validated package mapping, confirmed fault-protection behavior, and real-world design context for high-voltage analog signal switching in safety-critical systems.

Technical Context

The MAX379EWG+ implements a series N-channel/P-channel/N-channel MOSFET structure that actively blocks fault currents to nanoamp levels when power is off or overvoltage occurs. Its differential architecture supports simultaneous routing of two independent analog signals (e.g., IN1A/IN1B → OUTA/OUTB), with guaranteed break-before-make timing (25–200ns) preventing input-to-input shorts.

It operates from ±4.5V to ±18V supplies, maintains logic thresholds of 0.8V/2.4V across temperature, and delivers ≤3.5kΩ typical ON-resistance at ±15V. Fault protection extends to ±75V analog input with supplies off - exceeding first-generation devices limited to ±35V - while preserving latchup-proof CMOS construction.

Key Specifications

Pinout & Package

MAX379EWG+ is housed in a 24-pin Wide SO (Small Outline) package with 0.300-inch body width, JEDEC MS-013 compliant, lead-free and RoHS-compliant per Maxim's standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG509FBRZ and TMUX1309PWR, the MAX379EWG+ uniquely delivers dual-rail operation, ±75V no-supply fault tolerance, and guaranteed break-before-make - making it the sole option for ruggedized, maintenance-friendly analog signal routing in harsh environments.

Availability

MAX379EWG+ is available at Aetrix Electronics and suitable for industrial data acquisition, avionics test equipment, and process control systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.

Supply support for MAX379EWG+ 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, automotive, and communications markets.

The MAX379EWG+ belongs to Maxim's fault-protected analog multiplexer product line, engineered specifically for signal integrity and reliability in high-voltage industrial sensing and test instrumentation where sensor survivability and system uptime are mission-critical.

FAQ

What is the maximum continuous input voltage the MAX379EWG+ can withstand with its power supplies turned off?

The MAX379EWG+ sustains ±75V continuous analog input voltage with V+ and V− supplies disconnected. This capability is enabled by its series N-channel/P-channel/N-channel MOSFET structure, which turns off all conduction paths under zero-bias conditions, limiting input leakage to ≤100nA. This specification is explicitly guaranteed in the Absolute Maximum Ratings table and validated in Figure 5 of the datasheet.

Does the MAX379EWG+ support demultiplexer operation, and how is fault protection maintained in that mode?

Yes, the MAX379EWG+ functions as a demultiplexer when the OUTA/OUTB pins serve as inputs and the INxA/INxB pins become outputs. Fault protection remains fully active: overvoltage applied to OUTA/OUTB with supplies on or off triggers the same series-FET blocking action, limiting current to nanoamp levels. This bidirectional protection is documented in the "Operation as a Demultiplexer" section and distinguishes it from earlier-generation devices.

What is the guaranteed break-before-make delay for the MAX379EWG+, and why is it critical in multi-channel systems?

The MAX379EWG+ guarantees a break-before-make delay of 25–200ns (measured at +25°C). This ensures that one differential channel is fully disconnected before the next is connected - preventing momentary shorts between high-impedance sensor sources. In data acquisition systems scanning multiple thermocouples or strain gauges, this eliminates crosstalk-induced measurement errors and protects against back-driving damage.

Can the MAX379EWG+ operate from asymmetric power supplies, such as +15V and −5V, and what impact does this have on analog performance?

Yes, the MAX379EWG+ supports asymmetric supplies (e.g., +15V/V− = −5V). Output swing becomes limited to approximately V+ − 1.5V and V− + 3V - so with +15V/−5V, usable range is ~+13.5V to −2V. RDS(ON) and leakage remain within spec, but settling time increases slightly. This flexibility is confirmed in the "Operation with Supply Voltage Other than ±15V" section and enables retrofit into legacy systems with non-standard rails.

How does the MAX379EWG+ achieve TTL/CMOS compatibility without external pull-up resistors?

The MAX379EWG+ integrates internal logic threshold circuitry with guaranteed 0.8V (low) and 2.4V (high) switching points across −40°C to +85°C. Its digital inputs draw <1µA leakage current at all logic levels and include ESD protection (30V zener to V+), eliminating dependency on external biasing. This is verified in the Electrical Characteristics table under VAL/VAH and IIN(OFF) parameters.