Analog Devices Inc./Maxim Integrated MAX4628EUT+

Overview

MAX4628EUT+ from Maxim Integrated is a low-on-resistance, single-pole/single-throw (SPST), normally open analog switch with dual digital control inputs (IN and IN̅), operating from +1.8V to +5.5V single supply. It delivers 0.5Ω max on-resistance at +5V, 30ns max turn-off time, and integrated overcurrent protection-enabling robust signal routing in battery-powered audio/video systems and low-voltage data acquisition.

For engineers reviewing the MAX4628EUT+ datasheet, MAX4628EUT+ pinout, MAX4628EUT+ application, or MAX4628EUT+ equivalent, key selection criteria include its SOT23-6 package, dual-control logic interface, ±400mA continuous current rating, and guaranteed R_ON flatness of 0.1Ω at +5V-critical for precision analog switching where channel matching and distortion matter.

Technical Context

The MAX4628EUT+ implements a CMOS transmission-gate architecture with internal current-limit and thermal-shutdown circuitry. Its dual-control inputs enable complementary logic drive (IN high + IN̅ low = ON), supporting both active-high and active-low configurations without external inverters.

It features rail-to-rail analog signal handling (0V to V+), bidirectional signal flow, and TTL-compatible logic thresholds at +5V supply. Overcurrent response integrates fault duration: momentary shorts (<1ms) are tolerated, while sustained overload triggers 5ms cycling between ON and OFF states.

Key Specifications

Pinout & Package

SOT23-6 package: 1.6mm × 2.9mm footprint, 0.95mm height, gull-wing leads, RoHS-compliant, rated for -40°C to +85°C ambient operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4626EUK-T and ADG821BRMZ-REEL, the MAX4628EUT+ uniquely combines dual-control logic, on-chip overcurrent protection, and SOT23-6 compactness-making it optimal for space-constrained, safety-critical portable systems where control robustness and fault tolerance cannot be delegated to external circuitry.

Availability

MAX4628EUT+ is available at Aetrix Electronics and suitable for battery-operated equipment, audio/video signal routing, and low-voltage data-acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.

Supply support for MAX4628EUT+ 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) designs precision analog, mixed-signal, and power-management ICs for industrial, communications, computing, and consumer applications.

The MAX4626/MAX4627/MAX4628 family targets low-voltage, high-fidelity analog signal routing-optimized for portable, power-sensitive systems where on-resistance, speed, and fault resilience must coexist in minimal footprint.

FAQ

What is the maximum continuous current rating for the MAX4628EUT+?

The MAX4628EUT+ supports ±400mA continuous current between NO and COM terminals. This rating applies across the full operating temperature range (-40°C to +85°C) and is validated under worst-case voltage drop conditions. Exceeding this current may trigger the internal overcurrent protection, causing the switch to cycle ON/OFF. For reliable operation, keep steady-state load current below 400mA and ensure adequate PCB copper area for thermal dissipation near pins 1 (COM) and 2 (NO).

Does the MAX4628EUT+ require external components for overcurrent protection?

No, the MAX4628EUT+ includes fully integrated overcurrent protection with automatic thermal recovery. When current exceeds ~2.4A, the device enters a 5ms cycling mode-turning OFF for 5ms then attempting to re-enable. This eliminates the need for external current-sense resistors, comparators, or shutdown controllers. The protection responds to both short-circuit faults and sustained overload, making the MAX4628EUT+ self-protecting in end equipment like modems and portable test gear.

Can the MAX4628EUT+ operate with a 3.3V supply and still interface with 5V logic inputs?

Yes, the MAX4628EUT+ supports rail-to-rail logic inputs: IN and IN̅ accept voltages from 0V up to +5.5V regardless of V+ supply level. With V+ = 3.3V, driving IN to 5V or 0V is fully valid and does not damage the device. This allows direct connection to 5V-tolerant microcontrollers or FPGAs without level shifters-simplifying design in mixed-voltage systems such as industrial gateways where 3.3V analog sections interface with legacy 5V control buses.

What is the significance of R_ON flatness being specified as 0.1Ω max at +5V?

R_ON flatness of 0.1Ω max means the variation in on-resistance across the entire analog signal range (0V to V+) is ≤0.1Ω at +5V supply. This tight flatness ensures minimal harmonic distortion and consistent gain-critical in audio paths and precision measurement front-ends. For example, in a 0–3V sensor output switched by the MAX4628EUT+, the resistance change contributes <0.003% nonlinearity, directly enabling <12-bit accuracy without calibration. It reflects process-matched transistor design, not just typical performance.

Is the MAX4628EUT+ pin-compatible with any other Maxim analog switches?

The MAX4628EUT+ is not pin-compatible with MAX4626EUK-T or MAX4627EUK-T due to its unique SOT23-6 pinout and dual-control inputs (IN and IN̅). While MAX4626/MAX4627 use SOT23-5 with only one control pin, MAX4628EUT+ adds pin 5 (IN̅) and relocates GND to pin 3. Board redesign is required to substitute MAX4628EUT+. However, its functional behavior (NO configuration, same R_ON, t_OFF, and protection) aligns closely-making it a logical upgrade where dual-control logic or enhanced fault tolerance is needed.