Analog Devices Inc./Maxim Integrated MAX4656ETA

Overview

MAX4656ETA from Maxim Integrated is a normally open (NO), single-pole/single-throw (SPST), high-current CMOS analog switch optimized for rail-to-rail signal routing in industrial and telecom power-switching applications. It delivers ≤10Ω on-resistance at ±15V supplies, supports 300mA continuous/400mA peak switching current, and operates across ±4.5V to ±20V dual supplies or +9V to +40V single supply - enabling robust replacement of electromechanical relays in xDSL modems and PBX systems.

For engineers reviewing the MAX4656ETA datasheet, MAX4656ETA pinout, MAX4656ETA application, or MAX4656ETA equivalent, this page provides verified technical context, real-world design meaning for key specs (e.g., R_ON flatness, off-isolation, charge injection), package-specific thermal derating, and two validated alternative parts with documented functional trade-offs.

Technical Context

The MAX4656ETA implements a parallel N-channel/P-channel MOSFET switch architecture with proprietary body-drive sensing, eliminating the ~600mV voltage-drop limitation of conventional analog switches and enabling full rail-to-rail conduction without increased leakage or supply current. Its TTL/CMOS-compatible digital control input (VIH = 2.4V, VIL = 0.8V) directly interfaces with microcontrollers and logic families without level-shifting.

Dual-supply operation allows asymmetric configurations (e.g., V+ = +24V, V− = −5V) within a 40V total range, while its 1nA max off-leakage at +25°C and 25pF off-capacitance support high-impedance signal integrity in audio routing and test equipment front-ends.

Key Specifications

Pinout & Package

MAX4656ETA uses an 8-pin TDFN-EP (3mm × 3mm, 0.8mm height) package with exposed paddle (EP) for enhanced thermal dissipation. The EP must be soldered to a PCB thermal pad connected to V+ to achieve rated 1951mW power dissipation at +70°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4656ETA, MAX4656EUA trades thermal headroom for identical signal performance in smaller footprints, while ADG1419BRMZ offers lower on-resistance at the cost of reduced current capability and added supply complexity - making MAX4656ETA optimal for high-reliability, high-current industrial switching.

Availability

MAX4656ETA is available at Aetrix Electronics and suitable for relay replacement, test equipment signal routing, and communication system redundancy requiring stable component supply across industrial temperature ranges (−40°C to +85°C).

Supply support for MAX4656ETA 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 and mixed-signal ICs for industrial, communications, and computing applications, with emphasis on high-reliability, low-power, and high-performance solutions.

The MAX4655–MAX4658 family was engineered specifically for high-current analog switching in relay-replacement and telecom infrastructure roles, prioritizing robust rail-to-rail operation, low leakage, and thermal resilience in compact packages.

FAQ

What is the maximum continuous current rating for MAX4656ETA?

The MAX4656ETA supports ±300mA continuous current through its COM and NO terminals under specified thermal conditions (TA ≤ +70°C, EP connected to V+). This rating is validated per Absolute Maximum Ratings and Electrical Characteristics tables, and applies across the full −40°C to +85°C operating temperature range. Exceeding this current risks exceeding the 1951mW package power dissipation limit and triggering thermal shutdown.

Does MAX4656ETA require a separate logic-level supply (VL)?

No, MAX4656ETA does not require a VL supply. Its digital control input (IN pin) is fully TTL/CMOS compatible with VIH = 2.4V and VIL = 0.8V referenced to GND, operating directly from standard 3.3V or 5V logic rails. This eliminates the need for auxiliary voltage regulation and simplifies integration into microcontroller-based systems - a key differentiator from many competing analog switches.

What is the on-resistance flatness specification for MAX4656ETA, and why does it matter?

MAX4656ETA guarantees ≤1Ω maximum on-resistance flatness (R_FLAT(ON)) over its full analog signal range (V− to V+) at ±15V supplies. This tight flatness ensures minimal gain variation across the signal swing - critical in audio routing and precision instrumentation where distortion and amplitude error must stay below 0.01%. It is measured as the difference between max and min R_ON values at multiple V_COM points.

Can MAX4656ETA operate with asymmetric dual supplies, such as +24V and −5V?

Yes, MAX4656ETA supports asymmetric dual-supply operation as long as the total V+ to V− differential remains ≤40V and each supply stays within its absolute maximum rating (V+ to GND ≤ +44V, V− to GND ≥ −44V). For example, +24V/V− = −5V yields a 29V differential and is fully supported - enabling custom biasing for specialized sensor interfaces or legacy system integration.

How should the exposed paddle (EP) on MAX4656ETA be connected for optimal thermal performance?

The exposed paddle (EP) on MAX4656ETA must be soldered to a PCB thermal pad electrically connected to V+. This connection provides the primary thermal path for heat dissipation, enabling the full 1951mW power dissipation rating at +70°C ambient. Leaving EP floating or connecting it to GND degrades thermal resistance by >50% and risks exceeding junction temperature limits under 300mA load conditions.