Analog Devices Inc./Maxim Integrated MAX306CPI

Overview

MAX306CPI 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 targets high-accuracy sample-and-hold and test equipment signal routing.

For engineers reviewing the MAX306CPI datasheet, MAX306CPI pinout, MAX306CPI application, or MAX306CPI equivalent, key selection criteria include guaranteed on-resistance flatness (≤7Ω), low leakage (<2.5nA at +85°C), ESD protection (>2000V), TTL/CMOS logic compatibility, and plug-in upgrade path from DG406/DG506A.

Technical Context

The MAX306CPI implements a monolithic CMOS decoder-driven 16-channel switch matrix with address inputs A0–A3 and active-high enable (EN). Its silicon-gate architecture delivers flat on-resistance over full analog signal range (±15V) and minimal charge injection-critical for low-error sampling in precision instrumentation.

It features bidirectional analog signal paths (NO1–NO16, COM), dual-supply tolerance (V+, V−), ground-referenced logic interface (GND, EN, A0–A3), and no internal connection on pins 2, 3, and 13. All digital inputs maintain TTL/CMOS thresholds (VAL ≤ 0.8V, VAH ≥ 2.4V) independent of supply voltage.

Key Specifications

Pinout & Package

MAX306CPI is housed in a 28-pin plastic DIP (PDIP) package with 0.6-inch width, through-hole mounting, and industry-standard footprint compatible with socket-based prototyping and production fixtures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG406BRZ and DG406DJ, MAX306CPI delivers superior channel matching (<5Ω vs. unspecified or >15Ω), lower leakage (<2.5nA vs. 25nA), and guaranteed flatness-making it optimal for precision multiplexing where signal fidelity across all 16 channels is mandatory.

Availability

MAX306CPI is available at Aetrix Electronics and suitable for sample-and-hold circuits, automated test equipment, heads-up displays, and military radio systems requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature.

Supply support for MAX306CPI 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 high-reliability semiconductor solutions for industrial, medical, and aerospace applications.

The MAX306CPI belongs to Maxim's high-performance analog multiplexer product line, engineered specifically for applications demanding low distortion, minimal charge injection, and guaranteed matching across extended temperature ranges.

FAQ

What is the maximum analog signal voltage range supported by the MAX306CPI?

The MAX306CPI supports an analog signal range of ±15V when operated from ±15V dual supplies. With single-supply operation (+12V), the usable range is 0V to +12V. The device maintains <100Ω on-resistance and <7Ω flatness across these ranges, enabling direct interfacing with industrial sensors and bipolar op-amp stages without external level-shifting circuitry. This specification is guaranteed per the datasheet's Electrical Characteristics table under dual- and single-supply conditions.

Does the MAX306CPI require external pull-up resistors on its address or enable pins?

No, the MAX306CPI does not require external pull-up resistors on A0–A3 or EN. Its CMOS inputs exhibit low leakage (<1µA) and defined TTL/CMOS thresholds (VAL ≤ 0.8V, VAH ≥ 2.4V), allowing direct connection to microcontroller GPIOs or FPGA outputs. Internal input structure ensures reliable logic-level recognition without external biasing-confirmed by the "Input Current" specifications in the datasheet's Electrical Characteristics section.

Can the MAX306CPI be used with unbalanced supplies such as +24V and −5V?

Yes, the MAX306CPI supports unbalanced supplies including +24V and −5V, as explicitly stated in the Applications Information section. The absolute difference between V+ and V− must not exceed +44V, and the analog signal range adjusts accordingly (e.g., −5V to +24V). This flexibility allows integration into legacy power architectures without redesign, and all key specs-including on-resistance, leakage, and switching speed-remain valid under such configurations per the datasheet's operating conditions.

What is the thermal performance of the MAX306CPI in its PDIP package at +70°C ambient?

In its 28-pin PDIP package, the MAX306CPI has a power dissipation limit of 727mW at +70°C ambient, derating at 9.09mW/°C above that temperature. At full rated load, junction temperature rise is calculated using θ_JA ≈ 137°C/W. Measured supply currents (I+ = 30µA typ, I− = ±1µA) confirm ultra-low static power-critical for thermally isolated or convection-cooled deployments. These values are specified in the Absolute Maximum Ratings and Electrical Characteristics tables.

How does the MAX306CPI compare to the MAX306EPI in terms of temperature range and parameter guarantees?

The MAX306CPI is rated for 0°C to +70°C operation, while the MAX306EPI extends to −40°C to +85°C. Key parameters-including on-resistance (≤125Ω max), RON matching (≤8Ω), and leakage (≤2.5nA NO-off)-are guaranteed across the full extended range for the EPI variant. The CPI version guarantees identical specs only within 0°C to +70°C. Both share identical pinout, package, and functional behavior, making the EPI a direct upgrade for wider environmental deployment without layout changes.