Analog Devices Inc./Maxim Integrated MAX309CSE+

Overview

The MAX309CSE+ from Maxim Integrated is a precision differential 2-of-4 CMOS analog multiplexer, designed for bidirectional signal routing in high-fidelity data acquisition and test 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 rail-to-rail analog signal handling in military radios and automatic test equipment.

For engineers reviewing the MAX309CSE+ datasheet, MAX309CSE+ pinout, MAX309CSE+ application, or MAX309CSE+ equivalent, key selection criteria include guaranteed on-resistance flatness (≤7Ω), NO-off leakage <5nA at +85°C, COM-off leakage <20nA at +85°C, and compatibility with TTL/CMOS logic inputs across extended temperature ranges.

Technical Context

The MAX309CSE+ implements a CMOS decode logic architecture with dual 4-channel differential switching paths (COMA/COMB outputs, NO1A–NO4A and NO1B–NO4B inputs), controlled by A0/A1 address lines and an active-low EN enable input. Its silicon-gate process ensures low charge injection (<10pC) and ESD protection >2000V, critical for sample-and-hold integrity and system reliability.

It operates over 0°C to +70°C (C-grade), supports unbalanced supplies (e.g., +24V/−5V), and maintains stable on-resistance across ±10V analog signal ranges - with R_ON flatness ≤7Ω and matching ≤5Ω between channels under specified bias conditions.

Key Specifications

Pinout & Package

MAX309CSE+ is housed in a 16-pin narrow SOIC (Small Outline Integrated Circuit) package, 3.9mm wide, with standard JEDEC MS-012AC footprint and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX309ESE+, the MAX309CSE+ trades extended temperature capability for lower cost and same-pinout compatibility in commercial-grade systems; versus ADG409BRZ, it delivers tighter on-resistance matching, lower charge injection, and guaranteed flatness - making it preferable for high-fidelity signal routing where measurement integrity is critical.

Availability

MAX309CSE+ is available at Aetrix Electronics and suitable for military radios, automatic test equipment, heads-up displays, and sample-and-hold circuits requiring stable component supply, long-term sourcing continuity, and traceable manufacturing origin.

Supply support for MAX309CSE+ 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 demanding industrial, communications, and defense applications.

The MAX308/MAX309 product line delivers high-performance CMOS analog multiplexers optimized for low-leakage, low-charge-injection, and rail-to-rail operation in test, measurement, and ruggedized electronic systems.

FAQ

What is the maximum analog signal range supported by the MAX309CSE+?

The MAX309CSE+ supports an analog signal range of ±10V when operated with ±15V supplies, and scales proportionally with supply voltage - e.g., ±5V to ±20V bipolar or +5V to +30V single supply. The device maintains rail-to-rail operation, allowing signals from V− to V+ without clipping, which is confirmed in the Typical Operating Characteristics graphs and Absolute Maximum Ratings table of the official datasheet for MAX309CSE+.

Does the MAX309CSE+ require external pull-up resistors on its address or enable pins?

No, the MAX309CSE+ does not require external pull-up resistors on A0, A1, or EN pins. Its CMOS inputs exhibit low input current (±1.0µA max at TA = TMIN to TMAX), and logic thresholds are defined as VAH ≥ 2.4V and VAL ≤ 0.8V - compatible with standard TTL/CMOS drivers. This behavior is verified in the Electrical Characteristics table under "Input Current with Input Voltage High/Low" for MAX309CSE+.

Is the MAX309CSE+ pin-compatible with the DG409 analog multiplexer?

Yes, the MAX309CSE+ is a plug-in upgrade for the industry-standard DG409 and DG509A, as explicitly stated in the Features section of the MAX309CSE+ datasheet. Pin assignments, functional behavior, and electrical interface specifications match - enabling direct replacement without PCB modification in existing designs using those legacy parts.

What is the thermal performance of the MAX309CSE+ in narrow SOIC package?

The MAX309CSE+ in 16-pin narrow SOIC has a power dissipation derating factor of 8.70mW/°C above +70°C, with a maximum continuous power dissipation of 696mW at TA = +70°C. This thermal specification is documented in the Absolute Maximum Ratings table and applies specifically to the MAX309CSE+ package variant per the Ordering Information section.

Can the MAX309CSE+ operate with unbalanced supplies such as +24V and −5V?

Yes, the MAX309CSE+ supports unbalanced supplies including +24V and −5V, as confirmed in the Applications Information section of its datasheet. The device requires only that the difference between V+ and V− does not exceed +44V and that both rails remain within their absolute maximum ratings - enabling flexible power architecture design in mixed-voltage systems.