Analog Devices Inc./Maxim Integrated MAX4634ETB-T

Overview

MAX4634ETB-T from Maxim Integrated is a fast, low-voltage, 4-channel CMOS analog multiplexer with 4Ω (max) on-resistance, 18ns turn-on time, and 11ns turn-off time. It operates from +1.8V to +5.5V single supply, handles V+ to GND analog signals, and delivers 0.1nA (max) off-leakage at +25°C - ideal for precision signal routing in battery-powered instrumentation.

For engineers reviewing the MAX4634ETB-T datasheet, MAX4634ETB-T pinout, MAX4634ETB-T application, or MAX4634ETB-T equivalent, this page provides verified electrical parameters, truth-table–driven switching behavior, TDFN-EP package thermal and layout details, and real-world crosstalk/off-isolation performance at 1MHz.

Technical Context

The MAX4634ETB-T implements a 4:1 analog multiplexer using CMOS switch architecture with break-before-make timing (8ns typical), enabling channel isolation during address transitions. Its logic inputs (A0, A1, EN) support TTL/CMOS thresholds across supply voltages - +0.4V/+2.0V at +3V, +0.8V/+2.4V at +5V - ensuring robust digital control without level-shifting.

All four NOx switches connect to a common COM terminal, with guaranteed R_ON matching ≤0.3Ω and flatness ≤1Ω over full signal range (GND to V+). Internal protection diodes clamp analog inputs to V+ and GND, allowing safe operation even when analog signals exceed supply rails - provided current is limited to ±100mA peak.

Key Specifications

Pinout & Package

The MAX4634ETB-T is housed in a 10-pin TDFN-EP package (3mm × 3mm) with exposed pad (EP) internally connected to GND. The EP must be soldered to a large PCB ground plane for optimal thermal dissipation and EMI suppression.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4634ETB-T, ADG714BRUZ offers simpler logic but lacks integrated enable and thermal performance, while TMUX1574RSVR extends voltage range downward at the expense of pin compatibility and cost - making MAX4634ETB-T optimal for compact, industrial-grade 1.8V–5.5V multiplexing with proven reliability.

Availability

MAX4634ETB-T is available at Aetrix Electronics and suitable for battery-operated equipment, portable audio systems, medical sensor interfaces, and industrial PLC analog input cards requiring stable component supply and long-term manufacturability.

Supply support for MAX4634ETB-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) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.

The MAX4634 belongs to Maxim's high-speed analog switch family, engineered specifically for low-R_ON, low-leakage, and rail-to-rail signal routing in space-constrained, low-power systems.

FAQ

What is the maximum allowable analog signal voltage range for the MAX4634ETB-T?

The MAX4634ETB-T supports analog signals from GND to V+, meaning its full usable range tracks the positive supply rail. With V+ = +5.5V, signals from 0V to +5.5V are fully supported. Internal protection diodes clamp inputs to V+ and GND, allowing safe operation up to ±0.3V beyond those limits - but sustained overvoltage requires external current limiting per Absolute Maximum Ratings.

Does the MAX4634ETB-T require external pull-up or pull-down resistors on its logic inputs?

No, the MAX4634ETB-T does not require external pull-up or pull-down resistors on A0, A1, or EN. Its digital inputs have defined TTL/CMOS-compatible thresholds (+0.4V/+2.0V at +3V; +0.8V/+2.4V at +5V) and draw less than 1µA leakage. However, floating inputs must be avoided - EN should be tied to V+ if always enabled, or driven actively to prevent unintended channel activation.

How does the exposed pad (EP) on the MAX4634ETB-T package function electrically and thermally?

The exposed pad (EP) on the MAX4634ETB-T is internally connected to GND and must be soldered to a large PCB ground plane. Electrically, it serves as an additional GND connection to reduce impedance and improve noise immunity. Thermally, it lowers junction-to-board thermal resistance from 24.4°C/W (typical for TDFN) to <10°C/W with proper copper area - critical for maintaining R_ON stability and long-term reliability under continuous 50mA load.

Can the MAX4634ETB-T be used in bidirectional signal paths?

Yes, the MAX4634ETB-T supports bidirectional analog signal flow. Its CMOS switch architecture has no intrinsic directionality - COM and NOx terminals are interchangeable in terms of voltage range, R_ON, and leakage. Signal direction is determined solely by external circuitry; the device passes AC and DC equally well in either direction, provided voltage stays within GND to V+.

What is the guaranteed R_ON matching specification for the MAX4634ETB-T, and why does it matter in practice?

The MAX4634ETB-T guarantees R_ON matching of ≤0.3Ω (max) between any two channels. This means the difference between highest and lowest on-resistance across the four switches never exceeds 0.3Ω - critical for ratiometric measurements (e.g., bridge sensor readouts) where mismatch introduces gain error. At +5V, typical R_ON is 2.5Ω, so 0.3Ω represents just 12% variation, enabling sub-0.5% channel-to-channel gain consistency without calibration.