Analog Devices Inc./Maxim Integrated MAX322CPA

Overview

MAX322CPA from Maxim Integrated is a precision dual-supply SPST analog switch featuring one normally open (NO) and one normally closed (NC) channel, designed for ±3V to ±8V operation. It delivers 35Ω max on-resistance, <5pC charge injection, guaranteed break-before-make timing (2–5ns), and 100pA max leakage - enabling high-fidelity signal routing in ±5V DAC/ADC interfaces and battery-powered test equipment.

For engineers reviewing the MAX322CPA datasheet, MAX322CPA pinout, MAX322CPA application, or MAX322CPA equivalent, key selection criteria include bipolar supply compatibility, sub-5pC charge injection for sample-and-hold integrity, break-before-make assurance for glitch-free channel switching, and 0°C to +70°C plastic DIP packaging for legacy industrial designs.

Technical Context

The MAX322CPA implements complementary MOSFET switch pairs with matched threshold design to achieve <2Ω R_ON matching and <4Ω R_ON flatness across ±3V to ±8V supplies. Its logic interface accepts V_INH = V₊ − 1.5V and V_INL = V₊ − 2.5V thresholds, supporting direct connection to ±5V CMOS logic without level shifting.

Break-before-make timing is internally guaranteed at 2–5ns (T_A = +25°C), preventing momentary shorting between NO and NC paths during state transitions. All analog pins (COM, NO, NC) support bidirectional signal flow over the full V₋ to V₊ range, with ESD protection exceeding 2000V per Method 3015.7.

Key Specifications

Pinout & Package

MAX322CPA uses an 8-pin plastic DIP package (0.300" width) with industry-standard pin spacing and through-hole mounting. The package operates from 0°C to +70°C and supports wave or reflow soldering per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX322CPA, MAX322CSA offers identical performance in a smaller SOIC footprint ideal for new designs, while ADG1422BRZ trades guaranteed break-before-make and bipolar simplicity for lower R_ON in single-supply systems - making MAX322CPA the optimal choice for legacy ±5V test and control hardware requiring proven reliability and through-hole serviceability.

Availability

MAX322CPA is available at Aetrix Electronics and suitable for battery-operated test equipment, ±5V data acquisition modules, and military radio front-ends requiring stable component supply, long-term obsolescence management, and through-hole manufacturing compatibility.

Supply support for MAX322CPA 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX320/MAX321/MAX322 family was engineered for precision bipolar analog switching in measurement, instrumentation, and military-grade systems - emphasizing low distortion, guaranteed timing behavior, and robust supply flexibility.

FAQ

What is the maximum supply voltage range supported by the MAX322CPA?

The MAX322CPA operates from ±3V to ±8V dual supplies, with absolute maximum ratings specifying V+ up to (V− − 0.3V) and +17V, and analog pins rated from (V− − 0.3V) to (V+ + 0.3V). For reliable operation, maintain total supply span ≤17V and follow recommended power sequencing: apply V+ first, then V−, before logic or analog signals. This prevents latch-up and ensures specified R_ON and leakage performance in the MAX322CPA.

Does the MAX322CPA provide guaranteed break-before-make timing, and how is it verified?

Yes, the MAX322CPA guarantees break-before-make timing of 2–5ns at T_A = +25°C, as documented in its Electrical Characteristics table. This specification is ensured by internal circuit design and tested during production. Unlike the MAX320 (NO-only) or MAX321 (NC-only), only the MAX322CPA variant includes this feature - critical for preventing momentary shorts when toggling between NO1 and NC1 or NO2 and NC2 paths in the MAX322CPA.

Can the MAX322CPA be used with single-supply systems?

No, the MAX322CPA requires true dual supplies (V+ and V−) and is not specified for single-supply operation. Its logic thresholds (V_INH = V₊ − 1.5V, V_INL = V₊ − 2.5V) and analog signal range (V− to V+) depend on both rails. For single-supply alternatives, Maxim recommends the MAX323/MAX324/MAX325 family - which share functional equivalence but differ in supply architecture, making them incompatible drop-in replacements for the MAX322CPA.

What is the typical on-resistance flatness of the MAX322CPA, and why does it matter?

The MAX322CPA specifies on-resistance flatness of ≤4Ω max over its full analog signal range (V− to V+), meaning R_ON varies by no more than 4Ω as the switched signal voltage changes. This tight flatness ensures consistent gain, minimal THD, and predictable settling behavior - especially vital in precision applications like ±5V DAC output buffering or sensor signal conditioning where nonlinearity directly impacts measurement accuracy in the MAX322CPA.

How does the MAX322CPA handle ESD events, and what protection level is guaranteed?

The MAX322CPA provides ≥2000V human-body-model (HBM) ESD protection per Method 3015.7 on all pins, verified during production testing. This level exceeds standard industrial requirements and enables safe handling during manual assembly or field maintenance. The protection is intrinsic to the device structure - no external components are needed - and remains effective across its full 0°C to +70°C operating range, contributing to long-term reliability in test equipment and military radio applications using the MAX322CPA.