Analog Devices Inc./Maxim Integrated MAX4668ESE+

Overview

MAX4668ESE+ from Maxim Integrated is a dual, normally open (NO), single-pole single-throw (SPST) CMOS analog switch optimized for rail-to-rail signal routing in precision instrumentation and automated test equipment. It delivers 2.5Ω max on-resistance, 0.5Ω max R_ON match between channels, and 5nA max off-leakage at +85°C, enabling low-distortion switching of ±15V analog signals in reed-relay-replacement applications.

For engineers reviewing the MAX4668ESE+ datasheet, MAX4668ESE+ pinout, MAX4668ESE+ application, or MAX4668ESE+ equivalent, key selection criteria include guaranteed R_ON flatness (0.5Ω max over signal range), TTL/CMOS-compatible logic thresholds (+0.8V/+2.4V), and operation across ±4.5V to ±20V dual supplies or +4.5V to +36V single supply - critical for industrial signal conditioning and audio routing designs.

Technical Context

The MAX4668ESE+ implements complementary MOSFET-based SPST switches with break-before-make isolation only in the MAX4669 variant - not applicable here. Its control architecture uses independent digital inputs (IN1, IN2) referenced to VL, enabling direct interface with +5V logic while supporting ±15V analog rails without level shifting.

Each channel features matched on-resistance (ΔR_ON ≤ 0.4Ω) and flat R_ON (≤0.5Ω variation over full signal range), ensuring consistent gain and minimal harmonic distortion in AC-coupled paths. Off-isolation exceeds –60dB and crosstalk remains below –66dB at 1MHz, validated under dual-supply conditions with 50Ω source/load.

Key Specifications

Pinout & Package

MAX4668ESE+ is housed in a 16-pin narrow SOIC (SO/DIP) package with 1.27mm pitch, rated for –40°C to +85°C operation. Pin 1 is NO1, pin 2 is IN1, pin 3 is COM1, pin 4 is V–, pin 5 is GND, pin 6 is NC, pin 7 is IN2, pin 8 is NC, pin 9 is NC, pin 10 is NC, pin 11 is COM2, pin 12 is VL, pin 13 is V+, pin 14 is NC, pin 15 is NC, pin 16 is NO2. All NC pins are unconnected and must be tied to GND for optimal off-isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1419BRUZ and TS5A3157DCKR, the MAX4668ESE+ uniquely balances low R_ON, dual-supply flexibility, and TTL/CMOS compatibility - making it the preferred choice for legacy industrial test systems requiring drop-in reed-relay replacement without redesigning power or logic interfaces.

Availability

MAX4668ESE+ is available at Aetrix Electronics and suitable for automated test equipment, avionics sensor interfaces, and professional audio routing systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX4668ESE+ 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 MAX4667/MAX4668/MAX4669 family was designed specifically for high-fidelity, rail-to-rail analog signal switching in environments where mechanical relay limitations - including wear, bounce, and size - demanded a robust solid-state alternative.

FAQ

What is the maximum allowable voltage difference between V+ and V– for MAX4668ESE+?

The absolute maximum rating specifies |V+ – V–| ≤ 44V. This limit applies regardless of individual rail voltages - for example, V+ = +36V and V– = –5V is acceptable (41V differential), but V+ = +25V and V– = –25V violates the 44V ceiling. Exceeding this risks permanent damage to internal ESD protection diodes and switch FETs in the MAX4668ESE+.

Can MAX4668ESE+ operate with a single +12V supply and still interface with +3.3V logic?

Yes. The MAX4668ESE+ logic inputs accept +0.8V low and +2.4V high thresholds, which are compatible with +3.3V CMOS outputs. When using a +12V single supply (V– = GND), set VL = +3.3V or +5V to bias the input comparators correctly. The MAX4668ESE+ will reliably switch analog signals from 0V to +12V while interpreting +3.3V logic levels without external level shifters.

Does MAX4668ESE+ provide break-before-make switching like MAX4669?

No. The MAX4668ESE+ implements two independent normally open (NO) SPST switches with no guaranteed break-before-make timing. Only the MAX4669 variant integrates synchronized control logic to ensure channel 1 breaks before channel 2 makes contact. Using MAX4668ESE+ for applications requiring break-before-make - such as power domain isolation - necessitates external timing control or discrete logic to prevent momentary shorting.

What is the purpose of the NC pins on MAX4668ESE+, and how should they be handled?

The six NC pins (6, 8, 9, 10, 14, 15) on MAX4668ESE+ are not internally connected and serve no functional role. However, Maxim recommends tying them to GND to minimize stray capacitance and improve off-isolation performance - particularly critical above 1MHz. Leaving NC pins floating can degrade high-frequency isolation by up to 10dB and increase crosstalk in dense PCB layouts.

How does charge injection affect precision sampling circuits using MAX4668ESE+?

MAX4668ESE+ exhibits 450pC max charge injection, which induces a voltage glitch on hold capacitors: ΔV = Q/C. For a 1nF sampling capacitor, this causes a 450µV step - unacceptable in 16-bit+ systems. To mitigate, use smaller hold capacitors (e.g., 100pF yields 4.5mV glitch, then buffer/amplify) or select switches with <100pC injection (e.g., MAX4800) for high-resolution data acquisition where the MAX4668ESE+ is used primarily in non-sampling roles.