Analog Devices Inc./Maxim Integrated MAX4651EUE+T

Overview

MAX4651EUE+T from Maxim Integrated is a quad, normally closed (NC), single-pole single-throw (SPST) CMOS analog switch operating from a single +1.8V to +5.5V supply. It delivers 4Ω max on-resistance at +5V, 0.2Ω max on-resistance matching between channels, and rail-to-rail analog signal handling up to ±5.5V. It is used in low-distortion audio routing and battery-powered data-acquisition systems where mechanical relay replacement is required.

For engineers reviewing the MAX4651EUE+T datasheet, MAX4651EUE+T pinout, MAX4651EUE+T application, or MAX4651EUE+T equivalent, key selection criteria include verified NC configuration, 16-pin TSSOP package compatibility, sub-10ns switching speed, <0.1nA off-leakage at +25°C, and guaranteed 4Ω R_ON flatness over full signal range.

Technical Context

The MAX4651EUE+T implements four independent SPST switches with normally closed logic behavior: each switch conducts when its INx input is logic low (0V), and opens when high (≥2.4V at +5V). Its CMOS architecture enables rail-to-rail analog signal switching without level-shifting, supporting input voltages from GND to V+.

All four switches share a common +1.8V to +5.5V single supply (V+), require TTL/CMOS-compatible digital inputs, and exhibit matched dynamic performance: t_ON = 11–14ns and t_OFF = 6–8ns (at +5V, 25°C), with crosstalk ≤ –100dB and off-isolation ≤ –75dB at 1MHz.

Key Specifications

Pinout & Package

MAX4651EUE+T is housed in a 16-pin TSSOP package (4.4mm × 5.0mm, 0.65mm pitch) with exposed pad not present. Pin functions are electrically validated per Maxim's official pin description table and functional diagrams.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4652EUE+T and ADG1412BRUZ, MAX4651EUE+T uniquely combines NC default state, 4Ω R_ON, and 0.1nA leakage-making it optimal for low-power, fail-safe audio routing and high-precision DC-coupled data acquisition where minimal on-resistance mismatch and ultra-low leakage are critical.

Availability

MAX4651EUE+T is available at Aetrix Electronics and suitable for battery-powered systems, audio signal routing, low-voltage data-acquisition systems, and sample-and-hold circuits requiring stable component supply and long-term production continuity.

Supply support for MAX4651EUE+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, communications, computing, and consumer applications.

The MAX4651/MAX4652/MAX4653 family was engineered specifically for low-voltage, low-distortion analog switching in space-constrained portable and automated test equipment-emphasizing rail-to-rail operation, sub-10ns timing, and mechanical relay replacement.

FAQ

What is the default switch state of MAX4651EUE+T at power-up?

The MAX4651EUE+T features four normally closed (NC) switches. At power-up, with IN1–IN4 un-driven or held low, all four COM-to-NC paths are conductive. When V+ is applied and control inputs are high-impedance, internal weak pull-downs ensure default closure-verified in the device truth table and functional diagram. This behavior makes MAX4651EUE+T ideal for fail-safe signal paths that must remain connected until actively opened by firmware.

Does MAX4651EUE+T support rail-to-rail analog signals with a +3.3V supply?

Yes, MAX4651EUE+T fully supports rail-to-rail analog signals from GND to V+ across its entire supply range (+1.8V to +5.5V). At +3.3V, R_ON is 7Ω max, R_ON flatness is 2.5Ω max, and leakage remains ≤0.1nA at +25°C. The device's CMOS construction ensures no body diode conduction or signal clipping, enabling accurate switching of 0–3.3V sensor outputs, audio waveforms, or DAC references without external level-shifting circuitry.

What is the maximum signal frequency supported by MAX4651EUE+T?

MAX4651EUE+T maintains usable analog performance up to 10MHz, as confirmed by –75dB off-isolation and –100dB crosstalk at 1MHz and –50dB off-isolation at 10MHz. Its 32pF COM-on capacitance and 4Ω R_ON yield an approximate –3dB bandwidth of >100MHz for 50Ω systems. However, total harmonic distortion remains <0.02% only up to 20kHz; for RF applications above 1MHz, system-level impedance matching and layout parasitics become dominant limiting factors-not the switch itself.

Can MAX4651EUE+T be used with a +1.8V logic supply while operating from +5V analog supply?

No-MAX4651EUE+T uses a single supply (V+) for both analog and digital sections. The logic inputs (IN1–IN4) are TTL/CMOS-compatible but referenced to the same V+ rail. VIH is specified as 2.4V (min) at +5V supply and 2.0V (min) at +3V supply; at +1.8V supply, VIH drops to 0.8V. Therefore, interfacing with a separate +1.8V logic domain requires level translation. The device does not support split-supply or independent logic/analog rails.

Is thermal shutdown or overcurrent protection built into MAX4651EUE+T?

No, MAX4651EUE+T has no internal thermal shutdown or overcurrent protection circuitry. It relies on external design safeguards: absolute maximum ratings limit continuous current to ±50mA per terminal and peak pulsed current to ±100mA (1ms, 10% duty cycle). Exceeding these-especially with sustained >50mA through COM/NO/NC-causes irreversible junction heating. Layout best practices include current-limiting resistors, thermal vias under the TSSOP body, and verification of worst-case power dissipation (≤457mW at +70°C ambient).