Analog Devices Inc./Maxim Integrated MAX4854HETE

Overview

MAX4854HETE from Maxim Integrated is a quad SPST analog switch with overvoltage protection, 7Ω on-resistance, 27.5pF on-capacitance, and 150MHz -3dB bandwidth, operating from +2V to +5.5V. It protects USB 2.0 full-speed (12Mbps) D+/D− signal paths by entering high-impedance mode when input exceeds V_CC, making it ideal for portable data-switching applications.

For engineers reviewing the MAX4854HETE datasheet, MAX4854HETE pinout, MAX4854HETE application, or MAX4854HETE equivalent, this device supports high-bandwidth bidirectional signal routing with sub-1ns skew, rail-to-rail logic compatibility, and robust overvoltage fault handling in space-constrained USB interfaces.

Technical Context

The MAX4854HETE implements four independent CMOS SPST switches with active overvoltage protection: when any NO/COM terminal voltage exceeds V_CC by >0.5V, the affected switch automatically transitions to high-impedance state. Its low R_ON flatness (<4Ω across 0–V_CC) and minimal charge injection (8pC) preserve signal integrity for high-speed digital waveforms.

Control logic is polarity-selectable via part variant: MAX4854HETE uses active-high switching (IN_=high → ON), while MAX4854HL variants invert logic. All inputs tolerate up to +5.5V regardless of V_CC, enabling mixed-voltage system interfacing without level shifters.

Key Specifications

Pinout & Package

MAX4854HETE is housed in a 16-pin thin QFN package (3mm × 3mm × 0.8mm) with exposed thermal paddle connected to PCB ground. Pin 1 is marked by a dot; pin numbering follows JEDEC MO-220 standard counterclockwise from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TS3USB30E and ADG732BRUZ, MAX4854HETE uniquely integrates overvoltage protection, quad-channel matching, and 2–5.5V operation in a 3×3mm footprint-enabling compact, robust USB switching without supplemental protection circuitry.

Availability

MAX4854HETE is available at Aetrix Electronics and suitable for USB 2.0 interface design, portable electronics signal routing, and industrial data acquisition systems requiring stable component supply across extended temperature ranges.

Supply support for MAX4854HETE 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 industrial, communications, and consumer applications.

The MAX4854H series belongs to Maxim's high-bandwidth analog switch product line, engineered specifically for fault-tolerant USB 2.0 and high-speed data routing in space-constrained portable devices.

FAQ

What is the maximum analog signal voltage the MAX4854HETE can handle without triggering overvoltage protection?

The MAX4854HETE enters high-impedance mode when any NO or COM terminal voltage exceeds V_CC by more than 0.5V. For example, with V_CC = 3.3V, signals up to 3.8V are passed normally; above that, the switch disconnects. This threshold is guaranteed across -40°C to +85°C and applies independently to each channel. The MAX4854HETE does not clamp or limit voltage-it isolates-so external protection remains necessary for sustained overvoltage conditions.

Does the MAX4854HETE support bidirectional signal flow, and how does that affect USB D+/D− routing?

Yes, the MAX4854HETE supports fully bidirectional analog signal flow: COM and NO pins are functionally interchangeable, allowing either pin to serve as input or output. For USB D+/D− routing, this means the same MAX4854HETE device can handle host-to-peripheral or peripheral-to-host traffic without redesign. The matched R_ON and sub-1ns skew ensure symmetric rise/fall times and differential timing integrity in both directions-critical for maintaining USB 2.0 eye diagram compliance.

How does the logic polarity of the MAX4854HETE differ from the MAX4854HL variant, and why does it matter for firmware design?

The MAX4854HETE uses active-high logic: IN_=high connects COM to NO; IN_=low opens the switch. In contrast, the MAX4854HL variant uses active-low logic. This difference matters because firmware must assert opposite logic states to achieve identical switching behavior. Using the wrong variant without adjusting control code results in inverted functionality-e.g., USB lines remain disconnected when intended to route. Always verify the top-mark (ACD for MAX4854HETE, ACX for MAX4854HLETE) before firmware integration.

Can the MAX4854HETE be used with a 1.8V supply, and what are the implications for on-resistance and bandwidth?

No-the MAX4854HETE minimum supply voltage is +2.0V per absolute maximum ratings and electrical specifications. At 1.8V, the internal CMOS switches fail to turn on fully, resulting in undefined R_ON, degraded bandwidth, and potential logic threshold violation. Operation below 2.0V risks incomplete switching, increased THD, and unreliable overvoltage detection. For 1.8V-system designs, use logic-level translators to drive the MAX4854HETE's IN pins while powering it from ≥2.0V.

What is the role of the exposed paddle (EP) on the MAX4854HETE, and how should it be connected on the PCB?

The exposed paddle (EP) on the MAX4854HETE serves dual thermal and electrical functions: it conducts heat from the die to the PCB ground plane and provides a low-inductance ground return path for analog and digital currents. It must be soldered directly to a solid copper ground plane using ≥4 thermal vias (0.3mm diameter, spaced ≤1mm apart). Leaving EP floating or connecting it only through traces degrades thermal performance, increases ground bounce, and may cause EMI issues in high-speed USB applications.