Analog Devices Inc./Maxim Integrated MAX4518EPD

Overview

MAX4518EPD from Maxim Integrated is a precision 4-channel CMOS analog multiplexer with <100Ω on-resistance, <4Ω channel-to-channel matching, <5pC charge injection, rail-to-rail signal handling, and operation from +2.7V to +15V single supply or ±2.7V to ±8V dual supplies. It serves as a low-leakage, low-distortion signal routing switch in battery-powered data-acquisition and test equipment.

For engineers reviewing the MAX4518EPD datasheet, MAX4518EPD pinout, MAX4518EPD application, or MAX4518EPD equivalent, key selection criteria include guaranteed on-resistance flatness (<10Ω), NO-off leakage <2nA at +85°C, enable-controlled switching with break-before-make timing, TTL/CMOS-compatible logic inputs, and QSOP-16 package compatibility for space-constrained PCB layouts.

Technical Context

The MAX4518EPD implements a monolithic CMOS analog switch architecture with silicon-gate process optimization for minimal charge injection and ESD robustness (>2000V). Its 4:1 multiplexer topology uses two address bits (A0, A1) and an active-high enable (EN) to select one of four normally-open analog paths (NO1–NO4) to a common terminal (COM).

It supports both unipolar and bipolar analog signal ranges - up to ±4.5V with dual supplies or full rail-to-rail (0V to V+) with single supply - while maintaining sub-250ns transition time and guaranteed on-resistance flatness across the entire signal range. Logic inputs are compatible with TTL and CMOS voltage thresholds (VAL ≤ 0.8V, VAH ≥ 2.4V).

Key Specifications

Pinout & Package

MAX4518EPD is housed in a 16-pin QSOP (Quarter-Size Outline Package) with 0.15mm lead pitch and 5.0mm × 3.9mm body size. Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise convention from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1418BRUZ and TS5A23157DGSR, MAX4518EPD uniquely balances wide supply flexibility (±2.7V to ±8V / +2.7V to +15V), guaranteed flat on-resistance (<10Ω), and low charge injection (<5pC), making it optimal for precision, temperature-stable, and mixed-signal embedded systems where signal integrity and design margin are critical.

Availability

MAX4518EPD is available at Aetrix Electronics and suitable for automatic test equipment, battery-operated medical monitors, and precision sample-and-hold circuits requiring stable component supply across extended temperature and voltage operating conditions.

Supply support for MAX4518EPD 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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.

The MAX4518EPD belongs to Maxim's precision analog multiplexer product line, designed specifically for low-leakage, low-distortion signal routing in data-acquisition, test instrumentation, and military-grade embedded systems.

FAQ

What is the maximum analog signal range supported by the MAX4518EPD?

The MAX4518EPD supports rail-to-rail analog signals from V− to V+. With dual supplies (e.g., ±5V), this yields ±4.5V range; with single +5V supply, it supports 0V to +4.5V. The absolute maximum analog voltage is limited by V+ and V− ratings (−0.3V to V+ + 0.3V), and operation outside specified ranges risks latch-up or damage. The MAX4518EPD datasheet guarantees performance across these ranges with flat on-resistance and low leakage.

Does the MAX4518EPD require external pull-up resistors on its logic inputs?

No, the MAX4518EPD does not require external pull-up resistors. Its CMOS logic inputs (A0, A1, EN) have high impedance and are fully compatible with TTL/CMOS voltage thresholds (VAL ≤ 0.8V, VAH ≥ 2.4V). Internal input structures ensure reliable switching without external biasing, provided driving sources meet logic-level specifications. This simplifies interface design in microcontroller-based systems using the MAX4518EPD.

Can the MAX4518EPD operate with unbalanced supplies such as +10V and −5V?

Yes, the MAX4518EPD supports unbalanced supplies - for example, +10V and −5V - as long as the difference between V+ and V− does not exceed 17V and each supply remains within its absolute maximum rating (V+ ≤ +17V, V− ≥ −17V). The device maintains specified on-resistance, leakage, and switching performance under such conditions. This flexibility makes the MAX4518EPD suitable for legacy or custom power architectures where symmetric rails are unavailable.

What is the thermal operating range of the MAX4518EPD?

The MAX4518EPD is rated for operation from −40°C to +85°C, as indicated by the "E" grade suffix in its part number. This extended temperature range qualifies it for industrial, automotive under-hood (non-engine bay), and military communications applications. Performance parameters including on-resistance matching, leakage current, and switching speed are fully specified and guaranteed across this range, unlike commercial-grade variants (e.g., MAX4518CPD, 0°C to +70°C).

How does the enable (EN) pin function in the MAX4518EPD?

The EN pin on the MAX4518EPD is an active-high digital control that globally enables or disables all four analog switches. When EN = low, all channels are open (high-impedance off-state), regardless of A0/A1 state - preventing signal coupling or back-driving. When EN = high, channel selection proceeds normally via A0/A1. This feature allows synchronized switching across multiple MAX4518EPD devices and supports power-saving modes in battery-operated systems using the MAX4518EPD.