Analog Devices Inc./Maxim Integrated MAX4621CSE

Overview

MAX4621CSE from Maxim Integrated is a precision dual SPST analog switch with 5Ω max on-resistance, 0.5Ω max channel-to-channel R_ON match, and rail-to-rail analog signal handling (±18V bipolar or +36V single supply). It features <250ns turn-on time, <200ns turn-off time, and <5nA off-leakage at +85°C - ideal for reed relay replacement in test equipment and audio-signal routing.

For engineers reviewing the MAX4621CSE datasheet, MAX4621CSE pinout, MAX4621CSE application, or MAX4621CSE equivalent, key selection criteria include guaranteed break-before-make timing (not applicable), SPST NO topology, SOIC-16 narrow-body package, and compatibility with DG401-level control logic while delivering lower R_ON, flatter resistance vs. signal voltage, and improved leakage performance.

Technical Context

The MAX4621CSE implements two independent normally-open analog switches using monolithic CMOS process technology. Each switch supports bidirectional signal flow with guaranteed R_ON ≤5Ω and ∆R_ON ≤0.5Ω across channels, maintaining flatness of ≤0.5Ω over full analog range (±15V dual or 0–12V single supply).

It accepts TTL/CMOS-compatible logic inputs (V_INH = 2.4V min, V_INL = 0.8V max) referenced to VL pin, operates from ±4.5V to ±18V bipolar or +4.5V to +36V single supply, and guarantees <5nA COM_ off-leakage at +85°C with 475pC typical charge injection.

Key Specifications

Pinout & Package

MAX4621CSE is housed in a 16-pin narrow SOIC (SO/DIP) package with 1.27mm pitch, JEDEC MS-012AC compliant, 10.2mm × 5.3mm body size, and moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG401BRZ and TS5A23157DGSR, MAX4621CSE uniquely delivers guaranteed 0.5Ω R_ON matching, <5nA leakage at +85°C, and rail-to-rail ±18V operation - making it the only option among the three qualified for precision dual-channel instrumentation and high-voltage test equipment.

Availability

MAX4621CSE is available at Aetrix Electronics and suitable for reed relay replacement, automatic test equipment, and audio-signal routing requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAX4621CSE 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.

The MAX4621 series belongs to Maxim's precision analog switch product line, designed specifically for high-fidelity signal routing in test instrumentation, military radios, and avionics where low distortion, tight parameter matching, and wide supply tolerance are mandatory.

FAQ

What is the maximum supply voltage range supported by the MAX4621CSE?

The MAX4621CSE supports bipolar supplies from ±4.5V to ±18V and single supplies from +4.5V to +36V. Absolute maximum ratings allow V+ to GND up to +44V and V− to GND down to −44V, but functional operation is guaranteed only within the specified ranges. Exceeding ±18V or +36V risks permanent damage per the absolute maximum ratings table in the datasheet.

Does the MAX4621CSE require external pull-up resistors on its logic inputs?

No, the MAX4621CSE does not require external pull-up resistors on IN1 or IN2. Its logic inputs are TTL/CMOS-compatible with V_INH ≥ 2.4V and V_INL ≤ 0.8V, and input current is guaranteed ≤ ±0.5µA across temperature. Direct connection to FPGA GPIO or microcontroller outputs is fully supported without additional biasing components.

Is the MAX4621CSE pin-compatible with the DG401, and what improvements does it offer?

Yes, the MAX4621CSE is explicitly documented as a pin-compatible replacement for the DG401. It improves on the DG401 with 5Ω max on-resistance (vs. 45Ω), 0.5Ω max R_ON match (vs. unspecified), <250ns turn-on time (vs. 400ns), and <5nA off-leakage at +85°C (vs. 100nA). These enhancements directly enable higher accuracy, faster settling, and better thermal stability in deployed MAX4621CSE systems.

Can the MAX4621CSE operate with V− grounded in a single-supply configuration?

Yes, the MAX4621CSE can operate with V− connected to GND for single-supply use. In this mode, the analog signal range extends from GND to V+, supporting 0–12V or 0–24V applications. The device maintains all key specs including 5Ω max R_ON, <5nA leakage at +85°C, and rail-to-rail switching - confirmed in the "Electrical Characteristics-Single Supply" section of the datasheet.

What is the guaranteed on-resistance flatness specification for the MAX4621CSE?

The MAX4621CSE guarantees on-resistance flatness of ≤0.5Ω maximum over the full analog signal range (V_COM from V− to V+), defined as the difference between maximum and minimum R_ON measured across the signal swing. This flatness spec ensures consistent gain/attenuation in precision applications like programmable-gain amplifiers and calibrated sensor interfaces where signal-dependent resistance variation must be minimized.