Analog Devices Inc./Maxim Integrated MAX4509ESE+T

Overview

MAX4509ESE+T from Maxim Integrated is a dual 4-to-1 fault-protected analog multiplexer in a 16-pin narrow SOIC package, operating with ±4.5V to ±20V dual supplies or +9V to +36V single supply. It delivers rail-to-rail signal handling, ±25V overvoltage protection with supplies on, 400Ω max on-resistance, and 20ns fault-response time-enabling robust signal routing in avionics and industrial control systems where input faults up to ±40V may occur with power off.

For engineers reviewing the MAX4509ESE+T datasheet, MAX4509ESE+T pinout, MAX4509ESE+T application, or MAX4509ESE+T equivalent, key selection criteria include its dual 4-channel architecture, fault-clamped COM outputs during overvoltage events, TTL/CMOS-compatible logic inputs at +12V or ±15V, break-before-make timing, and guaranteed leakage performance across -40°C to +85°C.

Technical Context

The MAX4509ESE+T implements a parallel N-channel/P-channel FET switch architecture per channel-unlike traditional triple-FET fault-protected muxes-enabling true rail-to-rail analog conduction and low on-resistance (≤400Ω). Its dual independent 4-to-1 paths share common address (A0, A1) and enable (EN) inputs but feature separate COMA/COMB outputs and NOxA/NOxB inputs.

Fault protection operates via dedicated comparators monitoring each NOx pin against V+ and V−; exceeding rails by >150mV triggers immediate high-impedance isolation of the NOx pin and clamps the corresponding COM output to V+ (positive fault) or V− (negative fault) via internal booster FETs capable of ±10mA sourcing/sinking.

Key Specifications

Pinout & Package

MAX4509ESE+T uses a 16-pin narrow SOIC (S16-8) package, 3.9mm × 9.9mm body, 1.27mm pitch, lead-free (RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG509FBRZ and TMUX6219RTER, the MAX4509ESE+T uniquely combines dual 4-to-1 routing, ±40V off-state fault tolerance, rail-to-rail conduction, and integrated output clamping-making it optimal for avionics and industrial redundancy where board space, supply flexibility, and fault resilience are co-constrained.

Availability

MAX4509ESE+T is available at Aetrix Electronics and suitable for avionics signal routing, industrial redundant I/O, and high-voltage test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX4509ESE+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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX4509ESE+T belongs to Maxim's fault-protected analog switch family, engineered specifically for mission-critical signal routing where input overvoltage, power loss, and system reliability cannot be compromised.

FAQ

What is the maximum allowable voltage on NOx pins of the MAX4509ESE+T when supplies are powered off?

The MAX4509ESE+T guarantees ±40V fault protection on all NOx pins with V+ = V− = 0V. This means NOx inputs can safely withstand voltages from -40V to +40V relative to GND without damage or unintended conduction-even when the device is unpowered. The COMA and COMB pins are not fault-protected and must remain within V− to V+.

Does the MAX4509ESE+T support rail-to-rail analog signal switching with ±15V supplies?

Yes, the MAX4509ESE+T supports true rail-to-rail signal handling: analog signals from V− (-15V) to V+ (+15V) pass through the switch with minimal distortion or attenuation. This capability stems from its parallel N/P-FET architecture-unlike conventional fault-protected muxes that limit input range to ~3V below the rails.

How does the MAX4509ESE+T behave during a positive overvoltage fault on NO1A?

When NO1A exceeds V+ by >150mV, the internal positive fault comparator triggers: NO1A goes high-impedance, and COMA is actively clamped to V+ via an internal booster FET. The clamp provides ±10mA sourcing/sinking capability and exhibits ~1kΩ effective resistance-limiting fault current while protecting downstream circuitry.

Can the MAX4509ESE+T operate with asymmetric dual supplies, such as +12V and -5V?

Yes, the MAX4509ESE+T supports asymmetric dual supplies as long as the absolute difference |V+ − V−| does not exceed 44V (the absolute maximum rating). For example, V+ = +12V and V− = -5V yields a 17V span-well within spec-and maintains full fault protection, rail-to-rail conduction, and timing performance.

What is the guaranteed on-resistance match between channels for the MAX4509ESE+T?

The MAX4509ESE+T guarantees ΔRON ≤ 15Ω maximum between any two channels (ΔRON = RON(MAX) − RON(MIN)), measured under identical conditions (V+ = +15V, V− = -15V, VCOM = ±10V). This tight matching minimizes gain error in precision multiplexed instrumentation and ensures consistent channel performance across temperature (-40°C to +85°C).