Analog Devices Inc./Maxim Integrated MAX323CSA+T

Overview

MAX323CSA+T from Analog Devices is a precision dual SPST analog switch with two normally open (NO) channels, designed for single-supply operation from +2.7V to +16V. It delivers 60Ω max on-resistance, <2Ω channel-to-channel R_ON matching, and 5pC max charge injection - enabling high-fidelity signal routing in battery-powered test equipment and audio/video systems.

For engineers reviewing the MAX323CSA+T datasheet, MAX323CSA+T pinout, MAX323CSA+T application, or MAX323CSA+T equivalent, key selection criteria include guaranteed break-before-make timing (not applicable), TTL/CMOS logic compatibility at 5V, low leakage (<0.1nA at +25°C), fast switching (t_ON < 150ns), and SO-8 package suitability for space-constrained industrial PCBs.

Technical Context

The MAX323CSA+T implements CMOS transmission-gate architecture optimized for bidirectional analog signal switching across the full supply rail (GND to V+). Its logic inputs accept rail-to-rail voltage levels, and internal protection diodes clamp overvoltage transients up to ±8V relative to V+ when used with external blocking diodes.

It operates without dual-supply biasing and maintains stable R_ON flatness (<6Ω) and low temperature drift - critical for precision sample-and-hold circuits and DAC/ADC interface multiplexing where gain error and THD must remain predictable across voltage and temperature.

Key Specifications

Pinout & Package

MAX323CSA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with standard 1.27mm pitch and 5.0mm × 4.0mm body dimensions - compatible with automated SMT assembly and IPC-7351B land patterns.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX323ESA+, the MAX323CSA+T offers identical performance at lower cost for commercial-temperature applications, while ADG1419BRMZ trades precision matching and low charge injection for lower conduction loss - making it unsuitable as a drop-in replacement in metrology-grade designs.

Availability

MAX323CSA+T is available at Aetrix Electronics and suitable for battery-operated test equipment, audio signal routing, and +3V/+5V data acquisition systems requiring stable component supply and long-term sourcing continuity.

Supply support for MAX323CSA+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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets since 1965.

The MAX323CSA+T belongs to the MAX32x family of single-supply precision analog switches, engineered specifically for low-leakage, low-distortion signal routing in portable and high-accuracy measurement systems.

FAQ

What is the maximum supply voltage rating for MAX323CSA+T?

The absolute maximum supply voltage (V+) for MAX323CSA+T is +17V. Operation beyond this limit risks permanent damage. The recommended operating range is +2.7V to +16V, with optimal R_ON and leakage performance observed between +4.5V and +5.5V. Always observe proper power-supply sequencing - apply V+ before analog or logic signals - to avoid latch-up or ESD-induced failure in the MAX323CSA+T.

Does MAX323CSA+T support bidirectional analog signal flow?

Yes, MAX323CSA+T supports fully bidirectional analog signal routing on all NO and COM pins. Each channel functions identically regardless of signal direction - enabling flexible use as either input or output in signal chains. This is confirmed by the device's transmission-gate topology and specification of symmetric on-resistance (R_ON) and capacitance (C_COM(ON) = 22pF) across the analog path. Bidirectionality is preserved across the full 0V to V+ analog range in the MAX323CSA+T.

Is MAX323CSA+T pin-compatible with MAX324CSA+ or MAX325CSA+?

No, MAX323CSA+T is not pin-compatible with MAX324CSA+ or MAX325CSA+. While all three share the same SO-8 package and pin count, their pin functions differ: MAX323CSA+T uses Pins 1 and 5 as NO1 and NO2, whereas MAX324CSA+ uses those pins as NC1 and NC2, and MAX325CSA+ splits them as one NO and one NC. Substituting without schematic and layout revision will cause functional failure. Always verify pin mapping using the truth tables in the MAX323CSA+T datasheet before cross-referencing.

What is the guaranteed charge injection specification for MAX323CSA+T?

The guaranteed maximum charge injection for MAX323CSA+T is 5pC, measured under specified test conditions (C_L = 1.0nF, V_GEN = 0V, R_GEN = 0Ω). This parameter is critical for sample-and-hold and switched-capacitor applications, where injected charge causes output voltage glitches. The 5pC spec is tested and guaranteed across temperature and supply voltage, ensuring predictable settling behavior in precision timing circuits using the MAX323CSA+T.

Can MAX323CSA+T operate reliably from a +3.3V supply?

Yes, MAX323CSA+T is fully specified for +3.3V operation. At V+ = 3.3V, typical R_ON rises to ~120Ω (max 275Ω), t_ON increases to ≤400ns, and leakage remains within spec (<5nA over temperature). Logic inputs require rail-to-rail drive (0V/3.3V) for guaranteed switching - TTL compatibility is not maintained below +5V. System-level validation of signal integrity and settling time is recommended when using MAX323CSA+T at 3.3V in high-precision applications.