Analog Devices Inc./Maxim Integrated MAX303CSE

Overview

MAX303CSE from Maxim Integrated is a precision dual SPDT analog switch with two normally open (NO) and two normally closed (NC) poles, designed for high-accuracy signal routing in bipolar or single-supply systems. It delivers <35Ω max on-resistance, <2Ω channel-to-channel match, <15pC charge injection, <6nA off-leakage at +85°C, and sub-100ns turn-off time - enabling use in sample-and-hold circuits and military-grade test equipment.

For engineers reviewing the MAX303CSE datasheet, MAX303CSE pinout, MAX303CSE application, or MAX303CSE equivalent, key selection criteria include rail-to-rail analog signal handling (±15V), guaranteed on-resistance flatness (Δ5Ω max), CMOS/TTL logic compatibility, and 16-pin narrow SO package suitability for space-constrained industrial control and communication system PCBs.

Technical Context

The MAX303CSE implements a monolithic silicon-gate CMOS architecture optimized for precision analog switching, featuring matched transistor pairs to ensure ≤2Ω on-resistance tracking between its two independent SPDT channels. Its break-before-make timing (10–20ns) prevents signal shorting during state transitions, critical for multiplexed sensor interfaces.

It supports dual supply operation (±4.5V to ±20V) or single supply (+10V to +30V), with dedicated VL pin enabling stable +5V logic interface regardless of analog supply rails. Internal clamping diodes protect NO/NC/COM terminals against overvoltage up to V−−2V and V++2V.

Key Specifications

Pinout & Package

MAX303CSE is housed in a 16-pin narrow SOIC (S16-2) package, 7.5mm × 4.4mm body, 1.27mm pitch, JEDEC MS-012 compliant, with exposed pad not present. Pin 1 marked by notch or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1434BRUZ and TS5A3157DCKR, the MAX303CSE uniquely guarantees both channel-to-channel R_ON matching (<2Ω) and on-resistance flatness (Δ5Ω max) across its full ±15V analog range - making it irreplaceable in precision sample-and-hold and military-grade signal routing where gain/offset stability is non-negotiable.

Availability

MAX303CSE is available at Aetrix Electronics and suitable for sample-and-hold circuits, test equipment, military radios, and heads-up displays requiring stable component supply across industrial temperature grades and long-lifecycle programs.

Supply support for MAX303CSE 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 demanding industrial, automotive, and communications applications.

The MAX301/MAX303/MAX305 family was engineered specifically for high-accuracy, high-speed analog signal routing in environments requiring guaranteed matching, low charge injection, and rail-to-rail operation - targeting military, aerospace, and automated test systems.

FAQ

What is the maximum allowable supply voltage for MAX303CSE?

The MAX303CSE has an absolute maximum V+ to V− rating of 44V. It operates safely within ±4.5V to ±20V bipolar supplies or +10V to +30V single supply. Exceeding these limits risks permanent damage due to internal junction breakdown, even if average power dissipation remains within limits. Always observe proper power sequencing: V+ first, then VL, then V− and logic inputs.

Does MAX303CSE support rail-to-rail analog signal switching?

Yes, the MAX303CSE supports true rail-to-rail analog signal handling from V− to V+, including ±15V operation. This is enabled by its improved silicon-gate process and internal clamping structure. Signals beyond V−−2V or V++2V are clamped by on-chip diodes, limiting forward current to 30mA continuous - preserving integrity in wide-dynamic-range applications like military radio IF stages.

What is the function of the VL pin on MAX303CSE?

The VL pin on MAX303CSE provides a dedicated +5V logic supply reference, decoupling digital input thresholds from analog supply rails. This ensures consistent TTL/CMOS-compatible logic levels (V_INH ≥ 2.4V, V_INL ≤ 0.8V) regardless of whether the device runs on ±15V or +24V single supply - critical for reliable control in mixed-supply systems without external level shifters.

Can MAX303CSE replace MAX303CPE in the same PCB layout?

No - MAX303CSE (16-pin narrow SOIC, S16-2) and MAX303CPE (16-pin plastic DIP, P16-1) have incompatible footprints. The narrow SOIC measures 7.5mm × 4.4mm with 1.27mm pitch; the DIP is 19.1mm × 6.6mm with 2.54mm pitch. Direct replacement requires board redesign. Thermal and electrical performance are equivalent, but mechanical fit is not interchangeable.

What does "guaranteed on-resistance flatness" mean for MAX303CSE?

Guaranteed on-resistance flatness (Δ5Ω max over full analog signal range) means the MAX303CSE's R_ON varies by no more than 5Ω as the switched signal swings from V− to V+. This ensures consistent gain and minimal harmonic distortion in audio, video, and precision measurement paths - unlike typical analog switches where R_ON can vary >20Ω across the same range, introducing nonlinearity.