Analog Devices Inc./Maxim Integrated MAX323EPA+

Overview

MAX323EPA+ from Analog Devices is a precision dual normally open (NO) single-pole single-throw (SPST) analog switch IC, designed for single-supply operation from +2.7V to +16V. It delivers 60Ω max on-resistance, <2Ω channel-to-channel R_ON matching, and 150ns max turn-on time at +5V supply, enabling high-fidelity signal routing in battery-powered instrumentation and precision data acquisition systems.

For engineers reviewing the MAX323EPA+ datasheet, MAX323EPA+ pinout, MAX323EPA+ application, or MAX323EPA+ equivalent, key selection criteria include guaranteed R_ON flatness (<6Ω), 5pC max charge injection, -40°C to +85°C industrial temperature range, and 8-pin plastic DIP package compatibility with legacy through-hole layouts.

Technical Context

The MAX323EPA+ implements CMOS transmission-gate architecture with rail-to-rail analog signal handling (0V to V+), supporting bidirectional signal flow across both NO1/COM1 and NO2/COM2 paths. Its logic inputs are TTL-compatible at +5V supply and require rail-to-rail drive at other voltages to minimize power consumption.

It features break-before-make switching only in the MAX325 variant-MAX323EPA+ does not implement this function. All channels exhibit guaranteed 100pA max off-leakage at +25°C and <2.5nA at +85°C, with ESD robustness exceeding 2000V per Method 3015.7.

Key Specifications

Pinout & Package

MAX323EPA+ uses an 8-pin plastic DIP (dual in-line package) with 0.300-inch width, RoHS-compliant lead finish, and through-hole mounting. Pin 1 is NO1 (normally open terminal of Switch 1), Pin 2 is COM1 (common terminal of Switch 1), Pin 3 is IN2 (logic input for Switch 2), Pin 4 is GND, Pin 5 is NO2 (normally open terminal of Switch 2), Pin 6 is COM2 (common terminal of Switch 2), Pin 7 is IN1 (logic input for Switch 1), and Pin 8 is V+ (positive supply).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX323CPA, MAX323EPA+ adds industrial temperature qualification without altering pinout or functionality; versus ADG1419BRZ, it trades lower R_ON for significantly reduced charge injection and proven DIP layout compatibility.

Availability

MAX323EPA+ is available at Aetrix Electronics and suitable for battery-operated instrumentation, industrial sensor conditioning, and test equipment multiplexing requiring stable component supply across extended temperature ranges.

Supply support for MAX323EPA+ 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 measurement, industrial automation, and communications markets.

The MAX323 series belongs to Analog Devices' precision single-supply analog switch product line, engineered specifically for low-leakage, low-distortion signal routing in resource-constrained and thermally demanding applications.

FAQ

What is the maximum supply voltage rating for MAX323EPA+?

The absolute maximum supply voltage for MAX323EPA+ is +17V referenced to GND. Continuous operation is specified from +2.7V to +16V. Exceeding +17V may cause permanent damage. The device's internal clamping diodes activate above V+ or below GND, but forward current must be limited to ≤30mA to avoid degradation. MAX323EPA+ operates reliably across its full rated range without external regulation when driven within these limits.

Does MAX323EPA+ support bidirectional analog signal flow?

Yes, MAX323EPA+ supports fully bidirectional analog signal routing on both switch channels. The NO1/COM1 and NO2/COM2 paths are symmetric - either pin can serve as input or output depending on system architecture. This enables flexible implementation in multiplexer, demultiplexer, and signal-gating topologies without polarity constraints. Bidirectionality is maintained across the full 0V to V+ analog signal range, with R_ON flatness guaranteed to <6Ω.

Is MAX323EPA+ pin-compatible with MAX323CPA?

Yes, MAX323EPA+ is pin-compatible and functionally identical to MAX323CPA, differing only in temperature rating: MAX323EPA+ operates from -40°C to +85°C, while MAX323CPA is rated for 0°C to +70°C. Both share identical 8-pin plastic DIP packaging, pinout, electrical specifications, and logic behavior. No PCB redesign or layout change is required when upgrading from MAX323CPA to MAX323EPA+ for extended-temperature deployment.

What logic levels are compatible with MAX323EPA+ inputs?

MAX323EPA+ logic inputs (IN1, IN2) are TTL-compatible when powered from +5V: VINL ≤ 0.8V (LOW), VINH ≥ 2.4V (HIGH). At other supply voltages, rail-to-rail drive (0V for LOW, V+ for HIGH) is required to guarantee full performance and minimize supply current. Driving inputs outside this range risks increased power consumption or undefined switching behavior. The device does not include internal level shifters - input thresholds scale with V+.

Can MAX323EPA+ be used in sample-and-hold circuits?

Yes, MAX323EPA+ is well-suited for sample-and-hold (S/H) circuits due to its guaranteed ≤5pC charge injection, <2.5nA leakage at +85°C, and low R_ON flatness (<6Ω). These parameters minimize hold-mode droop and sampling-time glitches. When paired with a low-leakage hold capacitor and buffered op-amp, MAX323EPA+ enables accurate S/H operation up to ~1MHz. Its single-supply operation simplifies integration in portable or isolated S/H designs without dual-rail generation.