Analog Devices Inc./Maxim Integrated MAX309CPE+G26

Overview

MAX309CPE+G26 from Maxim Integrated is a precision differential 2-of-4 CMOS analog multiplexer designed for bidirectional signal routing in high-fidelity analog systems. It delivers <100Ω on-resistance (max), <5Ω channel-to-channel matching, <10pC charge injection, and supports ±5V to ±20V bipolar or +5V to +30V single-supply operation - enabling use in military radios, guidance systems, and battery-operated test equipment.

For engineers reviewing the MAX309CPE+G26 datasheet, MAX309CPE+G26 pinout, MAX309CPE+G26 application, or MAX309CPE+G26 equivalent, key selection criteria include guaranteed on-resistance flatness (≤7Ω over ±10V range), NO-off leakage <5nA at +85°C, COM-off leakage <20nA at +85°C, rail-to-rail signal handling, and plug-in compatibility with DG409/DG509A.

Technical Context

The MAX309CPE+G26 implements a CMOS decode logic architecture that selects one of two differential pairs (COMA/COMB) from four input pairs (NO1A–NO4A and NO1B–NO4B) using three address inputs (A1, A0, EN). Its silicon-gate process ensures low charge injection (<10pC) and ESD protection >2000V.

It operates across dual supplies (±5V to ±20V) or single supply (+5V to +30V), maintains TTL/CMOS logic compatibility, and guarantees break-before-make switching with tOPEN ≤450ns (typ) to prevent signal shorting during channel transitions.

Key Specifications

Pinout & Package

MAX309CPE+G26 is housed in a 16-pin plastic DIP package (0°C to +70°C operating range), with through-hole mounting and industry-standard footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX309CPE+G26, MAX309EPE offers identical electrical behavior with extended temperature support, while DG409DN provides legacy compatibility at the expense of precision metrics - making MAX309CPE+G26 optimal for new designs demanding low leakage, flat RON, and robust ESD immunity.

Availability

MAX309CPE+G26 is available at Aetrix Electronics and suitable for military radios, guidance systems, and automatic test equipment requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for MAX309CPE+G26 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 MAX308/MAX309 product line was engineered for precision analog signal routing in mission-critical systems - emphasizing low leakage, matched on-resistance, and robust operation across wide supply and temperature ranges.

FAQ

What is the maximum analog signal range supported by the MAX309CPE+G26?

The MAX309CPE+G26 supports an analog signal range of ±10V when operated with ±15V supplies, and scales linearly with supply voltage - e.g., ±5V supplies support ±5V signals. This rail-to-rail capability ensures full dynamic range utilization without clipping in precision analog paths. The device maintains guaranteed on-resistance flatness (≤7Ω) across this entire range, which is essential for maintaining linearity in instrumentation and control applications. MAX309CPE+G26 achieves this using Maxim's 44V silicon-gate CMOS process.

Does the MAX309CPE+G26 require external pull-up resistors on its address pins?

No, the MAX309CPE+G26 does not require external pull-up resistors on A0, A1, or EN pins because it features CMOS-compatible digital inputs with defined logic thresholds (VAL ≤ 0.8V for low, VAH ≥ 2.4V for high) and low input current (<±1.0µA). Internal input structure eliminates need for external biasing, simplifying PCB layout and reducing component count. MAX309CPE+G26 maintains this behavior across its full operating temperature range (0°C to +70°C).

Can the MAX309CPE+G26 operate with unbalanced supplies such as +24V and −5V?

Yes, the MAX309CPE+G26 supports unbalanced supplies including +24V and −5V, provided the total voltage difference (V+ − V−) does not exceed +44V and each supply remains within absolute maximum ratings (V+ ≤ 44V referenced to V−, GND ≤ 25V referenced to V−). This flexibility enables integration into hybrid power architectures common in avionics and industrial control. MAX309CPE+G26 retains specified leakage, on-resistance, and switching performance under such conditions per its datasheet test conditions.

What is the significance of the '+G26' suffix in MAX309CPE+G26?

'+G26' is a Maxim-specific tape-and-reel packaging and traceability code indicating the device is supplied in a 26-inch diameter reel with standard orientation and moisture sensitivity level (MSL) 1 handling. It does not affect electrical specifications or temperature grade - MAX309CPE+G26 retains the same 0°C to +70°C operating range and performance as MAX309CPE. The '+G26' designation ensures consistent automated assembly compatibility and lot traceability for high-volume manufacturing. MAX309CPE+G26 is fully interchangeable with MAX309CPE in both schematic and layout.

How does the MAX309CPE+G26 achieve break-before-make switching?

The MAX309CPE+G26 implements internal timing control that guarantees a minimum break-before-make interval (tOPEN) of 115ns (typ) to 450ns (max) during address changes - preventing momentary shorting between differential output pairs (COMA/COMB) and input pairs (NOxA/NOxB). This is achieved via dedicated decode logic and driver staging, independent of external timing. The feature is production-tested and guaranteed across temperature and supply variations. MAX309CPE+G26 relies on this intrinsic behavior rather than external delay circuitry to ensure signal integrity in safety-critical routing applications.