Analog Devices Inc./Maxim Integrated MAX4594ELT+

Overview

MAX4594ELT+ 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, featuring 10Ω max on-resistance, 35ns max turn-on time, and 0.5nA max off-leakage current. It enables low-distortion audio/video signal routing in space-constrained portable systems.

For engineers reviewing the MAX4594ELT+ datasheet, MAX4594ELT+ pinout, MAX4594ELT+ application, or MAX4594ELT+ equivalent, key selection criteria include its SC70-5 and µDFN-6 package options, bidirectional signal handling, guaranteed 5pC max charge injection, and -80dB off-isolation at 1MHz - critical for precision analog switching in battery-powered designs.

Technical Context

The MAX4594ELT+ implements a low-voltage, single-supply SPST switch architecture with CMOS transmission-gate topology, supporting rail-to-rail analog signal swing (GND to V+) and TTL/CMOS-compatible digital control. Its design ensures minimal R_ON flatness (1.5Ω max) over the full signal range at +5V, enabling consistent gain and linearity in audio paths.

It delivers 300MHz -3dB bandwidth at +25°C and 0.05% THD with 5Vp-p signals into 600Ω loads, confirming suitability for high-fidelity audio routing. The device guarantees 5pC max charge injection and maintains sub-1nA leakage across -40°C to +85°C, supporting stable DC-coupled switching in sensor and instrumentation front-ends.

Key Specifications

Pinout & Package

MAX4594ELT+ is packaged in a 6-pin µDFN (1.5mm × 1.0mm × 0.8mm) with exposed pad (EP) connected to GND for thermal and EMI performance. Pin 1 is marked by index area; pinout is identical to MAX4594EXK-T but in µDFN format.

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+ offers superior thermal dissipation and smaller footprint via µDFN; versus TMUX1574DSGR, it delivers tighter R_ON flatness, lower leakage, and higher off-isolation - critical for precision audio and instrumentation.

Availability

MAX4594ELT+ is available at Aetrix Electronics and suitable for cellular phones, battery-operated equipment, and audio/video signal routing requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAX4594ELT+ 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, and consumer applications.

The MAX4594–MAX4597 family was engineered for low-voltage, single-supply analog switching in space- and power-constrained portable electronics - emphasizing low R_ON, low leakage, and high bandwidth in ultra-small packages.

FAQ

What is the maximum supply voltage rating for MAX4594ELT+?

The MAX4594ELT+ has an absolute maximum supply voltage (V+) of +6V. However, its specified operational range is +2.0V to +5.5V. Exceeding +6V may cause permanent damage. For reliable operation, maintain V+ within the 2.0V–5.5V window and ensure proper power sequencing - apply V+ before analog or logic signals to avoid latch-up or overstress conditions. The MAX4594ELT+ datasheet specifies all electrical characteristics within this safe operating range.

Is MAX4594ELT+ bidirectional, and how does that affect signal routing?

Yes, the MAX4594ELT+ is fully bidirectional: its NO, NC, and COM pins are electrically interchangeable, allowing analog signals to pass equally well in either direction. This eliminates polarity constraints during PCB layout and simplifies system-level signal path design - for example, the same MAX4594ELT+ can route a microphone output to an ADC or an amplifier output to a speaker, depending on control logic. Bidirectionality is inherent to its CMOS transmission-gate structure and requires no external configuration.

What is the significance of 5pC max charge injection in MAX4594ELT+?

The 5pC maximum charge injection specification of the MAX4594ELT+ quantifies the transient voltage glitch induced on capacitive nodes (e.g., ADC sample-and-hold capacitors or audio coupling caps) when the switch turns off. At 5pC, and assuming a 100pF load, the resulting glitch is limited to 50mV - small enough to avoid saturation or measurable distortion in most precision applications. This parameter directly impacts settling time and DC accuracy, making it essential for data acquisition and high-fidelity audio switching where pop/click artifacts must be minimized.

Does MAX4594ELT+ support rail-to-rail analog signal operation?

Yes, the MAX4594ELT+ supports true rail-to-rail analog signal operation: its analog terminals (COM, NO, NC) handle voltages from GND to V+ without degradation in R_ON or increased distortion. This is confirmed by typical operating characteristics showing <2Ω R_ON variation across the full 0V to V+ range at +5V supply. Rail-to-rail capability enables direct interfacing with op-amps, ADCs, and DACs operating at the same supply rails - eliminating level-shifting circuitry and reducing BOM count in portable designs.

How does the µDFN-6 package of MAX4594ELT+ differ from the SC70-5 variant?

The MAX4594ELT+ uses a 6-pin µDFN (1.5mm × 1.0mm × 0.8mm) with an exposed thermal pad (EP), whereas the MAX4594EXK-T uses a 5-pin SC70 (1.6mm × 1.6mm) without an exposed pad. The µDFN offers 30% smaller footprint, better thermal resistance (via EP-to-GND connection), and lower parasitic inductance - advantageous for high-frequency and thermally sensitive applications. Electrically, both share identical specifications; the pinout differs slightly (NC pin added in µDFN), but functionality remains consistent across variants.