Analog Devices Inc./Maxim Integrated MAX306CWI+

Overview

The MAX306CWI+ from Maxim Integrated is a precision 1-of-16 single-ended CMOS analog multiplexer with ≤100Ω on-resistance, <5Ω channel-to-channel matching, and <10pC charge injection. It operates from +5V to +30V single supply or ±4.5V to ±20V dual supplies, supports rail-to-rail signal handling up to ±15V, and is used in test equipment, military radios, and sample-and-hold circuits where low leakage (<2.5nA at +85°C) and fast switching (<250ns transition time) are critical.

For engineers reviewing the MAX306CWI+ datasheet, MAX306CWI+ pinout, MAX306CWI+ application, or MAX306CWI+ equivalent, this page delivers verified specifications, package mapping to 28-pin wide SO, functional pin roles, real-world application context, and two validated alternative parts for design continuity and sourcing flexibility.

Technical Context

The MAX306CWI+ implements a monolithic CMOS switch architecture with integrated address decoder (A0–A3) and enable control (EN), supporting 16:1 analog signal routing to a common bidirectional COM terminal. Its silicon-gate process ensures guaranteed flat on-resistance (≤7Ω variation over ±10V signal range) and ESD protection >2000V.

All 16 NOx inputs and COM are fully bidirectional and rated for analog signals from V− to V+, with absolute maximum ratings of −0.3V to +44V on V+ and (V− −2V) to (V+ +2V) on NO/COM pins. Logic inputs are TTL/CMOS-compatible (VAL ≤ 0.8V, VAH ≥ 2.4V), and power consumption remains below 1.25mW at +25°C.

Key Specifications

Pinout & Package

MAX306CWI+ is housed in a 28-pin wide SO (Small Outline) package, RoHS-compliant, with 300 mil body width and standard gull-wing leads. Pin pitch is 0.050", and thermal resistance θ_JA is 12.50°C/W (derating 12.50mW/°C above +70°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX306CWI+, MAX306CPI+ offers identical electrical performance in a through-hole package but limits thermal headroom in compact layouts, while ADG406BRZ trades guaranteed precision specs for broader availability and lower unit cost-making it suitable only where datasheet-guaranteed matching and charge injection are not design-critical.

Availability

MAX306CWI+ is available at Aetrix Electronics and suitable for test equipment, military radio subsystems, and battery-operated medical monitors requiring stable component supply across extended product lifecycles.

Supply support for MAX306CWI+ 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, automotive, and communications markets.

The MAX306 series belongs to Maxim's precision analog switch product line, engineered specifically for applications demanding low on-resistance matching, ultra-low charge injection, and robust operation across military-grade temperature ranges.

FAQ

What is the maximum analog signal voltage range supported by the MAX306CWI+?

The MAX306CWI+ supports an analog signal range of ±15V when operated from ±15V dual supplies, or 0V to +12V with a +12V single supply. Absolute maximum ratings allow NO and COM pins to swing from (V− −2V) to (V+ +2V), but guaranteed performance is specified within the ±15V or 0–12V ranges depending on supply configuration. Exceeding these ranges risks increased leakage or distortion.

Does the MAX306CWI+ require external pull-up resistors on its address or enable pins?

No, the MAX306CWI+ does not require external pull-up resistors on A0–A3 or EN pins. Its CMOS inputs have low leakage (<±1.0µA) and are TTL/CMOS-compatible with defined logic thresholds (VAL ≤ 0.8V, VAH ≥ 2.4V). Driving these pins directly from microcontroller GPIOs or FPGA outputs is sufficient; adding pull-ups may cause unintended switching or increase power consumption unnecessarily.

Can the MAX306CWI+ be used with unbalanced supplies such as +24V and −5V?

Yes, the MAX306CWI+ supports unbalanced supplies like +24V and −5V, provided the difference between V+ and V− does not exceed +44V and each supply remains within its absolute maximum rating (V+ ≤ +44V, V− ≥ −0.3V). The analog signal range adjusts accordingly-for example, with +24V/−5V, the usable range is approximately −5V to +24V, though guaranteed specs apply only within the documented ±4.5V to ±20V or +5V to +30V ranges.

How does the MAX306CWI+ compare to the industry-standard DG406 in terms of pin compatibility?

The MAX306CWI+ is a direct plug-in upgrade for the DG406, sharing identical pinout, supply voltage ranges, logic thresholds, and switching characteristics. No PCB changes are required when replacing DG406 with MAX306CWI+, and all timing parameters-including tTRANS (<250ns), tON(EN) (<200ns), and charge injection (<10pC)-meet or exceed DG406 specifications while adding improved ESD protection (>2000V) and tighter on-resistance matching (<5Ω).

What is the thermal derating behavior of the MAX306CWI+ in its wide SO package?

The MAX306CWI+ in 28-pin wide SO has a thermal resistance θ_JA of 12.50°C/W and a maximum continuous power dissipation of 1000mW at +70°C ambient. Above +70°C, power dissipation must be linearly derated at 12.50mW/°C-e.g., at +90°C ambient, max allowable power drops to 750mW. This derating ensures junction temperature stays within safe limits (T_J ≤ +150°C) under sustained load conditions.