Analog Devices Inc./Maxim Integrated MAX309ESE+T

Overview

MAX309ESE+T from Maxim Integrated is a precision differential 2-of-4 CMOS analog multiplexer with on-resistance <100Ω, on-resistance matching <5Ω between channels, and guaranteed flatness of ≤7Ω over ±10V signal range. It operates from ±5V to ±20V bipolar supplies or +5V to +30V single supply, features <10pC charge injection, and supports rail-to-rail analog signal handling in military-grade (-40°C to +85°C) temperature range.

For engineers reviewing the MAX309ESE+T datasheet, MAX309ESE+T pinout, MAX309ESE+T application, or MAX309ESE+T equivalent, key selection criteria include differential channel architecture, low leakage (<5nA NO-off at +85°C), fast transition time (<250ns), ESD protection >2000V, and plug-in compatibility with DG409/DG509A in narrow SO-16 package.

Technical Context

The MAX309ESE+T implements a CMOS decode logic architecture with dual 4-channel differential switching paths (COMA/NO1A–NO4A and COMB/NO1B–NO4B), enabling independent selection of two differential pairs via A1/A0 address inputs and shared EN control. Its silicon-gate process ensures matched on-resistance across channels and minimal variation with signal voltage and temperature.

It supports both unbalanced and balanced supply configurations (e.g., +24V/–5V), maintains TTL/CMOS input compatibility across full supply range, and delivers rail-to-rail analog signal handling without degradation in on-resistance flatness or charge injection performance - critical for precision sample-and-hold and guidance system front-ends.

Key Specifications

Pinout & Package

Narrow SO-16 package (5.0mm × 4.4mm, 1.27mm pitch), RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX309ESE+T, MAX309EPE offers identical electrical performance in a through-hole package but sacrifices board-area efficiency and thermal performance; ADG409BRUZ provides broader supply voltage headroom but lacks the guaranteed channel matching and high-temperature leakage performance needed for precision defense electronics.

Availability

MAX309ESE+T is available at Aetrix Electronics and suitable for military radios, guidance and control systems, and automatic test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX309ESE+T 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 demanding industrial, automotive, and defense applications.

The MAX308/MAX309 product line was designed specifically for precision analog signal routing in harsh-environment systems where channel matching, low leakage, and robust ESD tolerance are non-negotiable - targeting military comms, avionics, and automated test infrastructure.

FAQ

What is the maximum analog signal range supported by the MAX309ESE+T?

The MAX309ESE+T supports an analog signal range of ±10V when operated with ±15V supplies, and scales linearly with supply voltage - e.g., ±5V supplies yield ±5V range. This rail-to-rail capability is guaranteed across the full –40°C to +85°C operating temperature range, with on-resistance flatness maintained at ≤7Ω. The device does not support signals exceeding V+ or falling below V–, and internal clamping diodes limit absolute input voltage to (V– – 2V) to (V+ + 2V).

Does the MAX309ESE+T require external pull-up resistors on its address inputs?

No, the MAX309ESE+T does not require external pull-up resistors on A0, A1, or EN inputs. Its CMOS inputs exhibit low input current (<±1.0µA at +25°C) and are fully TTL/CMOS-logic compatible, accepting VAH ≥ +2.4V and VAL ≤ +0.8V over the full supply range. Internal input structure eliminates need for external biasing, simplifying interface design with microcontrollers and FPGAs.

Can the MAX309ESE+T operate with unbalanced supplies like +24V and –5V?

Yes, the MAX309ESE+T supports unbalanced supplies such as +24V and –5V, provided the total voltage difference (V+ – V–) does not exceed +44V and each supply remains within its absolute maximum rating (V+ ≤ +44V referenced to V–, GND ≤ +25V referenced to V–). This flexibility enables integration into legacy military power architectures without additional regulation, while maintaining specified on-resistance and leakage performance.

How does the MAX309ESE+T differ from the MAX308ESE+T in pinout and functionality?

The MAX309ESE+T is a differential 2-of-4 multiplexer with dual COM/NO banks (COMA/COMB and NO1A–NO4A/NO1B–NO4B), whereas the MAX308ESE+T is a single-ended 1-of-8 device with one COM and eight NO pins. Their SO-16 pinouts are incompatible: MAX309ESE+T uses pins 2–7 for NO1A–NO4A/NO1B–NO4B and pins 8–9 for COMA/COMB, while MAX308ESE+T dedicates pins 4–12 to NO1–NO8 and pin 8 to COM. They share EN, A0/A1, V+/V–, and GND placements but are not pin-compatible replacements.

Is the MAX309ESE+T qualified for use in aerospace applications per MIL-PRF-38535?

The MAX309ESE+T is not QML-V or MIL-PRF-38535 qualified; it is rated for –40°C to +85°C operation and meets MIL-STD-883 Class B screening for enhanced reliability, but lacks full QML flow certification. For aerospace applications requiring radiation tolerance or extended qualification, the MAX309MJE (CERDIP, –55°C to +125°C) variant is available - however, MAX309ESE+T is widely deployed in non-flight-critical avionics subsystems including HUDs and ground-support test equipment where commercial-extended temp grade suffices.