Analog Devices Inc./Maxim Integrated MAX4621CSE+

Overview

The MAX4621CSE+ from Maxim Integrated is a precision dual SPST analog switch with 5Ω max on-resistance, guaranteed 0.5Ω 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 <500pA off-leakage at +25°C - optimized for low-distortion signal routing in test equipment and communication systems.

For engineers reviewing the MAX4621CSE+ datasheet, MAX4621CSE+ pinout, MAX4621CSE+ application, or MAX4621CSE+ equivalent, key selection criteria include guaranteed break-before-make timing (not applicable), dual-supply compatibility, CMOS/TTL logic interface, and verified replacement capability for DG401 in reed-relay-replacement designs.

Technical Context

The MAX4621CSE+ implements two independent normally-open (NO) analog switches in a monolithic CMOS process. Each switch supports bidirectional signal flow with flat on-resistance (<0.5Ω variation over full ±15V signal range) and operates across ±4.5V to ±18V bipolar supplies or +4.5V to +36V single supply while maintaining TTL/CMOS-compatible logic inputs (V_INL ≤ 0.8V, V_INH ≥ 2.4V).

Its internal protection diodes clamp signals exceeding V+ or V−, and charge injection is limited to 475pC (typ) - critical for data-acquisition sample-hold integrity. Off-isolation exceeds –62dB at 1MHz, and crosstalk remains below –60dB between channels.

Key Specifications

Pinout & Package

MAX4621CSE+ is housed in a 16-pin narrow SOIC (SO/DIP) package with exposed pad not present; thermal resistance θ_JA = 115°C/W.

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+ uniquely delivers guaranteed 0.5Ω R_ON matching, rail-to-rail ±18V operation, and proven DG401 drop-in compatibility - making it the sole option for high-accuracy, wide-supply industrial multiplexing.

Availability

MAX4621CSE+ is available at Aetrix Electronics and suitable for reed-relay replacement, automated test equipment, and precision data-acquisition systems requiring stable component supply across extended temperature and voltage ranges.

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) designs high-performance analog and mixed-signal ICs for industrial, communications, and computing applications.

The MAX4621CSE+ belongs to Maxim's precision analog switch product line, engineered specifically for low-distortion, high-reliability signal routing in mission-critical test and measurement systems.

FAQ

What is the maximum supply voltage rating for MAX4621CSE+ in single-supply operation?

The MAX4621CSE+ supports a single positive supply from +4.5V to +36V. Absolute maximum rating is +44V referenced to GND. Operation above +36V violates specifications and risks permanent damage. For reliable long-term use, maintain V+ ≤ +36V with proper decoupling and thermal management per the datasheet layout guidelines. The MAX4621CSE+ must never be operated beyond this limit even momentarily.

Does MAX4621CSE+ require a separate logic supply (VL) when using TTL-level control signals?

Yes, the MAX4621CSE+ requires VL to be connected - typically to +5V - to establish correct logic thresholds (V_INL ≤ 0.8V, V_INH ≥ 2.4V). Even with TTL inputs, VL decouples logic interface from analog rails, ensuring noise immunity and preventing false triggering. Leaving VL unconnected invalidates logic operation and may cause erratic switching behavior in the MAX4621CSE+.

Can MAX4621CSE+ be used in bipolar supply configurations with asymmetric voltages (e.g., V+ = +12V, V− = −5V)?

Yes, the MAX4621CSE+ supports asymmetric bipolar supplies as long as |V+ − V−| ≤ +44V and each rail stays within its absolute maximum rating (V+ to GND ≤ +44V, V− to GND ≥ −44V). However, analog signal range remains constrained to V− to V+, so asymmetry reduces usable swing. For example, with V+ = +12V and V− = −5V, the MAX4621CSE+ passes signals only from −5V to +12V - not rail-to-rail relative to system ground.

Is MAX4621CSE+ pin-compatible with the DG401 across all package types?

Yes - the MAX4621CSE+ in 16-pin narrow SOIC is a direct pin-compatible replacement for the DG401 in the same package. Both share identical pin functions, spacing, and thermal footprint. This compatibility extends to the through-hole 16-pin PDIP variant (MAX4621CPE vs. DG401CP). No PCB modification is needed when upgrading from DG401 to MAX4621CSE+ in matching packages.

What is the guaranteed maximum on-resistance flatness for MAX4621CSE+ over its full analog signal range?

The MAX4621CSE+ guarantees on-resistance flatness of ∆R_ON ≤ 0.5Ω max over the full specified analog signal range (V− to V+). This means the difference between highest and lowest R_ON measured at any point across the signal swing - e.g., from −15V to +15V - will not exceed 0.5Ω. This specification holds across temperature (0°C to +70°C) and ensures consistent gain/attenuation in precision instrumentation using the MAX4621CSE+.