Analog Devices Inc./Maxim Integrated MAX4621CSE+T

Overview

The MAX4621CSE+T 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 (±15V dual or +12V single supply). It features <250ns turn-on time, <200ns turn-off time, and <500pA off-leakage at +25°C - ideal for reed relay replacement in test equipment and audio-signal routing.

For engineers reviewing the MAX4621CSE+T datasheet, MAX4621CSE+T pinout, MAX4621CSE+T application, or MAX4621CSE+T equivalent, key selection criteria include guaranteed break-before-make timing (not applicable), bipolar/single-supply flexibility, low charge injection (45pC), and SOIC-16 package compatibility with legacy DG401 designs.

Technical Context

The MAX4621CSE+T implements two independent normally-open (NO) analog switches in a monolithic CMOS process. Each switch supports bidirectional signal flow across the full supply range (V− to V+), with on-resistance flatness ≤5Ω over ±10V analog swing and guaranteed matching ≤0.5Ω between channels.

It accepts TTL/CMOS-compatible logic inputs (0.8V/2.4V thresholds) referenced to VL (typically +5V), operates from ±4.5V to ±18V dual supplies or +4.5V to +36V single supply, and integrates internal ESD protection diodes clamping NO/COM/NC terminals to V+ and V−.

Key Specifications

Pinout & Package

MAX4621CSE+T is housed in a 16-pin narrow SOIC (SO/DIP) package with 1.27mm pitch, JEDEC MS-012AC compliant, and rated for 0°C to +70°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG401BRZ and TS5A23157DCUR, the MAX4621CSE+T uniquely delivers guaranteed 0.5Ω R_ON matching, ±15V rail-to-rail operation, and <250ns switching in a single SOIC-16 package - making it the only option qualified for high-accuracy, wide-supply test and military radio signal routing.

Availability

MAX4621CSE+T is available at Aetrix Electronics and suitable for reed relay replacement, test equipment design, and audio-signal routing requiring stable component supply across industrial temperature ranges and long production lifecycles.

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

The MAX4621CSE+T belongs to Maxim's precision analog switch product line, engineered for low-distortion, high-reliability signal routing in automatic test equipment and mission-critical communication systems.

FAQ

What is the maximum analog signal voltage range supported by the MAX4621CSE+T?

The MAX4621CSE+T supports rail-to-rail analog signals from V− to V+, with absolute maximum ratings of ±44V across V+ and V−. In standard operation, it handles ±15V dual supplies or +12V single supply while maintaining 5Ω max on-resistance and <500pA leakage at +25°C. This makes MAX4621CSE+T suitable for industrial sensor interfaces and avionics signal conditioning where full-swing integrity is essential.

Does the MAX4621CSE+T require a separate logic supply voltage?

Yes, the MAX4621CSE+T requires VL (pin 13) as a dedicated logic supply reference, typically +5V, to establish TTL/CMOS-compatible input thresholds (0.8V low, 2.4V high). This decouples logic switching margins from analog supply rails, ensuring reliable control even when V+ and V− vary widely. The MAX4621CSE+T will not function correctly without a valid VL connection, as confirmed in the Pin Description and Electrical Characteristics tables.

Is the MAX4621CSE+T pin-compatible with the DG401 series?

Yes, the MAX4621CSE+T is explicitly specified as a pin-compatible replacement for the DG401 in the datasheet's Features section and Pin Configurations. Both use identical SOIC-16 and PDIP-16 footprints with matching V+, V−, GND, IN, COM, and NO pin assignments. However, MAX4621CSE+T improves on DG401 with lower on-resistance (5Ω vs. 45Ω), tighter R_ON matching (0.5Ω vs. unspecified), and enhanced leakage performance.

What is the guaranteed on-resistance match between the two channels of the MAX4621CSE+T?

The MAX4621CSE+T guarantees an on-resistance match of ≤0.5Ω maximum between its two SPST switches across the full operating temperature range (0°C to +70°C). This is measured as ∆R_ON = R_{ON_MAX} − R_{ON_MIN} and is critical for differential signal integrity and gain-matched multiplexing. The datasheet confirms this spec under "ELECTRICAL CHARACTERISTICS-Dual Supplies" with test conditions at T_MIN to T_MAX.

Can the MAX4621CSE+T operate from a single +5V supply?

No, the MAX4621CSE+T cannot operate from a single +5V supply. Its minimum single-supply voltage is +4.5V, but functional analog switching requires sufficient headroom: the datasheet specifies that analog signals must stay within V− to V+, and with V− = GND, V+ must be ≥±4.5V to ensure 5Ω R_ON and <250ns t_ON. At +5V, R_ON rises significantly (see Figure MAX4621/2/3-03), degrading precision. For +5V systems, consider the TS5A23157 instead - but MAX4621CSE+T is not rated for that condition.