Analog Devices Inc./Maxim Integrated MAX20337AEFT+

Overview

MAX20337AEFT+ from Maxim Integrated is an ultra-small, low-on-resistance (0.19Ω typ), single-pole/double-throw (SPDT) analog switch with Beyond-the-Rails™ capability, enabling distortion-free signal switching from −5.5V to +5.5V independent of VCCEN supply voltage (1.6V to 5.5V). It features break-before-make timing (23.7ms typ), ±30kV HBM ESD protection on analog pins, and operates in a 1.25mm × 1.75mm FC2QFN-6 package for portable audio/video routing in space-constrained designs.

For engineers reviewing the MAX20337AEFT+ datasheet, MAX20337AEFT+ pinout, MAX20337AEFT+ application, or MAX20337AEFT+ equivalent, this page delivers verified electrical parameters, thermal resistance (θJA = 171.6°C/W), CB control logic behavior, THD+N (−114dB typ), and real-world use cases in USB-C SBU switching and microphone path selection-without extrapolation or generic claims.

Technical Context

The MAX20337AEFT+ implements a CMOS-based SPDT architecture with dedicated digital control input (CB) that selects COM-to-NC (CB low) or COM-to-NO (CB high), while maintaining high-impedance state when VCCEN is unpowered. Its internal charge-pump-free design enables true Beyond-the-Rails operation without external negative supplies.

It delivers 220MHz −3dB bandwidth, 19pF NO_ off-capacitance, and 27pF COM_ on-capacitance-key for preserving signal integrity in high-fidelity audio paths. Thermal shutdown activates at +150°C with +25°C hysteresis, ensuring robustness under sustained load conditions in mobile end equipment.

Key Specifications

Pinout & Package

MAX20337AEFT+ uses a 6-pin FC2QFN package (1.25mm × 1.75mm, 0.4mm pitch) with exposed thermal pad. Pin 1 is GND, Pin 2 is VCCEN, Pin 3 is CB, Pin 4 is COM, Pin 5 is NC, and Pin 6 is NO. The package supports reflow soldering per JEDEC J-STD-020 and provides θJA = 171.6°C/W on a four-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX20337ENT+, MAX20337AEFT+ offers superior thermal dissipation in FC2QFN packaging but larger footprint; versus TMUX1574RSVR, it delivers 2.6× lower RON, 9dB better THD+N, and full Beyond-the-Rails operation-making it essential for premium audio routing where signal fidelity and voltage headroom are non-negotiable.

Availability

MAX20337AEFT+ is available at Aetrix Electronics and suitable for portable audio/video equipment, USB-C interface modules, and smartphone microphone path management requiring stable component supply, RoHS-compliant sourcing, and long-term production continuity.

Supply support for MAX20337AEFT+ 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 demanding applications in industrial, automotive, and consumer electronics.

The MAX20337AEFT+ belongs to Maxim's ultra-low-RON analog switch product line, engineered specifically for high-fidelity, space-constrained portable audio and video signal routing with robust ESD tolerance and rail-to-rail signal handling.

FAQ

What is the maximum analog signal voltage range supported by the MAX20337AEFT+?

The MAX20337AEFT+ supports an analog signal range of −5.5V to +5.5V on COM, NO, and NC terminals, independent of the VCCEN supply voltage. This Beyond-the-Rails™ capability allows distortion-free passage of AC-coupled or DC-biased audio/video signals even when VCCEN is as low as 1.6V-enabling flexible system-level voltage domain partitioning without external level shifters or negative supplies.

Does the MAX20337AEFT+ require external ESD protection components?

No, the MAX20337AEFT+ integrates robust on-die ESD protection: ±30kV HBM on COM/NO/NC pins, ±7kV IEC 61000-4-2 air-gap, and ±8kV contact discharge. These ratings exceed typical IEC 61000-4-2 Level 4 requirements for handheld devices, eliminating the need for external TVS diodes in most portable audio/video applications when layout guidelines (e.g., short traces, proper grounding) are followed.

How does the CB pin control switching behavior in the MAX20337AEFT+?

In the MAX20337AEFT+, the CB pin is a CMOS-compatible digital control input: driving CB low connects COM to NC, while driving CB high connects COM to NO. The switch remains in high-impedance state when VCCEN is unpowered, regardless of CB state. Input thresholds are VIH ≥ 1.4V and VIL ≤ 0.4V, allowing direct interfacing with 1.8V or 3.3V GPIOs without level translation.

What is the thermal performance of the MAX20337AEFT+ in its FC2QFN package?

The MAX20337AEFT+ in FC2QFN-6 exhibits a junction-to-ambient thermal resistance (θJA) of 171.6°C/W on a standard four-layer PCB. Its junction-to-case (θJC) is 58.7°C/W, indicating effective heat transfer to the PCB copper. Continuous power dissipation is rated at 466.2mW at TA = +70°C, derating by 5.83mW/°C above that temperature-sufficient for typical audio switching loads with <100mA current.

Can the MAX20337AEFT+ be used in bidirectional signal paths?

Yes, the MAX20337AEFT+ is fully bidirectional: COM, NO, and NC terminals may serve as either input or output depending on system topology. Signal flow direction is determined by external circuitry-not device architecture-enabling flexible use in microphone input selection, headphone output routing, or SBU line switching in USB-C implementations without polarity constraints.