Analog Devices Inc./Maxim Integrated MAX4594ELT+T

Overview

MAX4594ELT+T from Maxim Integrated is a normally open (NO), single-pole/single-throw (SPST) CMOS analog switch operating from a single +2.0V to +5.5V supply. It delivers 10Ω max on-resistance, 1.5Ω max on-resistance flatness over the full analog signal range, <40ns switching times, and 0.5nA max off-leakage - optimized for low-voltage audio routing in portable battery-powered systems.

For engineers reviewing the MAX4594ELT+T datasheet, MAX4594ELT+T pinout, MAX4594ELT+T application, or MAX4594ELT+T equivalent, key selection criteria include its 6-pin µDFN package, bidirectional signal path, guaranteed 5pC max charge injection, -80dB off-isolation at 1MHz, and compatibility with TTL/CMOS logic levels across its full supply range.

Technical Context

The MAX4594ELT+T implements a low-voltage, single-supply SPST analog switch architecture using CMOS transmission-gate topology. Its control logic accepts TTL/CMOS-compatible inputs (VIH = 2.0V min at +3V supply; 2.4V min at +5V), enabling direct interfacing with microcontrollers and baseband processors without level-shifting.

It supports rail-to-rail analog signal handling (0V to V+) with minimal R_ON variation - 1.5Ω flatness at +5V and stable bandwidth (300MHz -3dB at +25°C). The device features internal ESD protection and is specified for operation from -40°C to +85°C with guaranteed leakage and timing performance across temperature.

Key Specifications

Pinout & Package

MAX4594ELT+T is housed in a 6-pin µDFN package (1.5mm × 1.0mm × 0.8mm, exposed pad), optimized for space-constrained portable designs. The exposed pad must be soldered to ground for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4594EXK+T, the MAX4594ELT+T offers superior thermal performance via its exposed-pad µDFN and tighter charge injection spec; versus TMUX1574DSGR, it supports wider supply range (+2.0V to +5.5V) and higher off-isolation, making it more robust in mixed-voltage telecom and industrial interfaces.

Availability

MAX4594ELT+T is available at Aetrix Electronics and suitable for cellular phone audio routing, portable medical sensor multiplexing, and DSL modem line interface protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAX4594ELT+T 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 consumer applications.

The MAX4594–MAX4597 family was designed specifically for low-voltage, single-supply analog signal routing in space- and power-constrained portable electronics - emphasizing rail-to-rail operation, ultra-low leakage, and minimal distortion.

FAQ

What is the maximum supply voltage rating for MAX4594ELT+T?

The MAX4594ELT+T has an absolute maximum supply voltage (V+) of +6V, but its recommended operating range is +2.0V to +5.5V. Exceeding +5.5V risks violating the device's specified electrical characteristics and may accelerate wear-out mechanisms. Always observe the +6V absolute limit during transient conditions such as power sequencing or ESD events. The MAX4594ELT+T is not rated for continuous operation above +5.5V.

Does MAX4594ELT+T support bidirectional analog signal flow?

Yes, the MAX4594ELT+T supports fully bidirectional analog signal routing between its NO and COM pins. This is inherent to its CMOS transmission-gate architecture - neither terminal is designated as input or output. Signal direction is determined solely by external circuit topology, enabling flexible use in audio paths, sensor interfaces, and bus isolation where signal polarity or source/sink roles vary dynamically. The MAX4594ELT+T maintains identical R_ON and leakage specs regardless of signal direction.

What is the function of Pin 1 (NC) on MAX4594ELT+T?

Pin 1 on the MAX4594ELT+T is labeled "N.C." (No Connection) and is not internally bonded to the die. It serves as a mechanical placeholder in the 6-pin µDFN footprint and must remain unconnected in the PCB layout. While some designs tie NC pins to ground for mechanical stability, Maxim's datasheet does not recommend or specify grounding Pin 1 - doing so provides no electrical benefit and may risk unintended coupling in high-frequency layouts. The MAX4594ELT+T's functionality is fully defined by Pins 2–6.

How does charge injection affect system performance with MAX4594ELT+T?

Charge injection in the MAX4594ELT+T - specified at 5pC max - causes a transient voltage glitch (∆V = Q/C_L) at the COM node when the switch turns off. In sample-and-hold or ADC front-end applications, this can introduce offset error or settling delay. For a 100pF load capacitance, 5pC yields 50mV glitch - mitigated by minimizing C_L, adding hold capacitors, or synchronizing switching outside critical sampling windows. The MAX4594ELT+T's guaranteed low value enables reliable use in 12-bit+ precision systems when properly laid out.

Is MAX4594ELT+T pin-compatible with other variants in the MAX4594–MAX4597 family?

No, MAX4594ELT+T is not pin-compatible with MAX4595ELT+T, MAX4596ELT+T, or MAX4597ELT+T. Although all share the same 6-pin µDFN package, their pin functions differ: MAX4594/MAX4596 are NO switches (IN controls COM–NO), while MAX4595/MAX4597 are NC (IN controls COM–NC). Swapping them without redesigning the control logic will invert switch behavior - e.g., a normally open path becomes normally closed. The MAX4594ELT+T's specific pin mapping (Pin 6 = NO, Pin 1 = NC) is unique to its NO function and must be verified against the truth table in the datasheet.