Analog Devices Inc./Maxim Integrated MAX4661EAE+

Overview

MAX4661EAE+ from Maxim Integrated is a quad SPST analog switch with four normally closed (NC) channels, designed for rail-to-rail signal routing in precision analog systems. It delivers 2.5Ω max on-resistance, 0.5Ω max R_ON match between channels, and 5nA max off-leakage at +85°C, operating from +4.5V to +36V single supply or ±4.5V to ±20V dual supply. It is used in ADC front-ends, test equipment multiplexing, and audio-signal path selection.

For engineers reviewing the MAX4661EAE+ datasheet, MAX4661EAE+ pinout, MAX4661EAE+ application, or MAX4661EAE+ equivalent, key selection criteria include guaranteed NC configuration, -40°C to +85°C temperature rating, 16-pin SSOP package, low charge injection (20pC typ), and TTL/CMOS-compatible logic inputs with separate VL pin.

Technical Context

The MAX4661EAE+ implements CMOS transmission-gate architecture with independent channel control, enabling simultaneous or staggered switching of four NC paths. Its on-resistance flatness (0.7Ω max over ±10V signal range) and matched R_ON ensure minimal gain error and crosstalk in multi-channel data acquisition.

It features a dedicated logic supply pin (VL) decoupled from analog rails, ensuring consistent 0.8V/2.4V logic thresholds across full analog supply range (+4.5V to +36V or ±4.5V to ±20V). Internal ESD protection exceeds 2kV per Method 3015.7 without external components.

Key Specifications

Pinout & Package

MAX4661EAE+ is housed in a 16-pin shrink small-outline package (SSOP) with 0.65mm lead pitch, optimized for high-density PCB layouts and thermal performance up to +85°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad SPST analog switch applications.

Compared with ADG1411BRUZ and TS5A3157DCUR, MAX4661EAE+ uniquely combines NC default state, wide ±20V dual-supply capability, and a dedicated VL pin-making it the only option among the three qualified for industrial ATE and fail-safe sensor interface designs requiring uninterrupted signal continuity.

Availability

MAX4661EAE+ is available at Aetrix Electronics and suitable for automated test equipment, industrial sensor interfaces, and precision ADC front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX4661EAE+ 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 computing markets.

The MAX4661EAE+ belongs to Maxim's precision analog switch product line, engineered for low-distortion, high-reliability signal routing in mission-critical test and measurement systems where mechanical relay limitations must be overcome.

FAQ

What is the default switch state of MAX4661EAE+ at power-up?

The MAX4661EAE+ features four normally closed (NC) switches, meaning all COM-to-NC paths are conductive when IN pins are un-driven or held at logic low (≤0.8V). This fail-safe behavior ensures signal continuity during system initialization or controller reset-critical in safety-critical sensor interfaces and ATE signal paths where open-circuit faults must be avoided. The NC state is inherent to the device topology and requires no external biasing.

Can MAX4661EAE+ operate with a single 5V supply?

Yes, MAX4661EAE+ supports single-supply operation from +4.5V to +36V. With V+ = +5V and V− tied to GND, it delivers rail-to-rail analog switching from 0V to +5V. Logic inputs remain compatible via the VL pin, which can be tied to +3.3V or +5V independently. However, on-resistance increases slightly at lower supplies (4Ω max at +5V vs. 2.5Ω at +12V), and off-isolation degrades above 10MHz-verify performance in your specific signal chain.

How does the VL pin function in MAX4661EAE+?

The VL pin on MAX4661EAE+ establishes independent logic threshold voltages (0.8V low, 2.4V high) regardless of analog supply levels. This allows a 3.3V microcontroller to reliably control switches operating with ±15V analog rails-eliminating level shifters. VL must be connected within (GND − 0.3V) to (V+ + 0.3V); floating VL invalidates logic compatibility and may cause erratic switching. It draws <0.5µA, minimizing power impact.

What is the maximum continuous current per switch in MAX4661EAE+?

MAX4661EAE+ supports ±200mA continuous current through each COM, NC, or NO terminal-verified across its full operating temperature range (−40°C to +85°C). This rating assumes proper PCB copper pour and thermal relief. For pulsed operation (1ms, 10% duty cycle), peak current rises to ±300mA. Exceeding these limits risks metallization failure; derate linearly above +70°C ambient using the SSOP package's 7.1mW/°C thermal resistance.

Is MAX4661EAE+ pin-compatible with other devices in the MAX466x family?

Yes, MAX4661EAE+, MAX4662EAE+, and MAX4663EAE+ share identical 16-pin SSOP pinouts and footprint. However, their switch configurations differ: MAX4661EAE+ is quad NC, MAX4662EAE+ is quad NO, and MAX4663EAE+ is dual NC/dual NO with break-before-make. Swapping requires logic inversion for MAX4661EAE+ ↔ MAX4662EAE+, and firmware validation for MAX4663EAE+ due to timing differences. Electrical specs (R_ON, leakage, speed) are otherwise matched.