Analog Devices Inc./Maxim Integrated MAX394CAP+

Overview

The MAX394CAP+ from Analog Devices is a precision quad SPDT analog switch optimized for low-voltage, rail-to-rail signal routing in portable and test equipment. It operates from ±2.7V to ±8V bipolar or +2.7V to +15V single supply, delivers <35Ω max on-resistance with <2Ω channel matching, and features 10pC max charge injection and <75ns turn-off time. It is used in audio signal routing, heads-up displays, and portable instrumentation where low leakage and flat R_ON are critical.

For engineers reviewing the MAX394CAP+ datasheet, MAX394CAP+ pinout, MAX394CAP+ application, or MAX394CAP+ equivalent, key selection criteria include guaranteed on-resistance flatness (Δ4Ω max), break-before-make timing (10ns typ), TTL/CMOS logic compatibility across supply ranges, and SSOP-20 packaging suitable for space-constrained PCB layouts.

Technical Context

The MAX394CAP+ integrates four independent CMOS SPDT switches fabricated using low-voltage silicon-gate process technology. Each switch supports rail-to-rail analog signal handling between V− and V+, with logic inputs compatible over +0.8V to +2.4V (≤+8V supplies) or +0.8V to +4V (>+8V supplies).

It guarantees break-before-make switching (10ns typical), sub-2.5nA off-channel leakage at +85°C, and electrostatic discharge robustness >2000V per Method 3015.7. Charge injection is tightly controlled at ≤10pC, enabling precision sampling in data acquisition systems without significant settling error.

Key Specifications

Pinout & Package

The MAX394CAP+ is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, optimized for compact PCB layouts while maintaining thermal and electrical performance comparable to wider SO packages.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX394CAP+, MAX333ACPP+ trades lower cost and wider temperature range for higher on-resistance and larger package, while ADG1414BRUZ offers superior conduction performance at the expense of guaranteed break-before-make behavior-making MAX394CAP+ uniquely balanced for portable, precision, and safety-aware analog routing.

Availability

MAX394CAP+ is available at Aetrix Electronics and suitable for test equipment, communications systems, heads-up displays, and portable instruments requiring stable component supply and long-term production continuity.

Supply support for MAX394CAP+ 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.

The MAX394CAP+ belongs to Analog Devices' precision analog switch product line, engineered for low-distortion, low-leakage signal routing in battery-powered and metrology-grade applications where parameter consistency across temperature and supply variations is mandatory.

FAQ

What supply voltage ranges does the MAX394CAP+ support?

The MAX394CAP+ supports bipolar supplies from ±2.7V to ±8V and single supplies from +2.7V to +15V. Its analog signal range extends rail-to-rail between V− and V+, and logic inputs remain compatible across these ranges-guaranteed +0.8V to +2.4V for supplies ≤+8V and typically +0.8V to +4V for higher supplies. This flexibility allows direct integration into diverse power architectures without level-shifting circuitry.

Does the MAX394CAP+ guarantee break-before-make switching, and what is its typical timing?

Yes, the MAX394CAP+ guarantees break-before-make (B-B-M) switching with a typical delay of 10ns. This ensures that the normally open (NO) and normally closed (NC) paths are never simultaneously conductive, preventing signal shorts during state transitions. The specification is verified across temperature and supply conditions, making it reliable for fault-tolerant routing in test and avionics systems where signal integrity during switching is critical.

What is the maximum on-resistance of the MAX394CAP+, and how does it vary with signal voltage?

The MAX394CAP+ has a maximum on-resistance of 35Ω under ±4.5V supply conditions with ±3.5V analog signals. Its on-resistance remains exceptionally flat-varying by no more than Δ4Ω across the full analog signal range-due to proprietary process and layout design. This flatness is guaranteed and tested, ensuring predictable gain and minimal harmonic distortion in precision amplifier and filter applications.

How does the MAX394CAP+ handle electrostatic discharge (ESD), and is external protection needed?

The MAX394CAP+ is rated for >2000V HBM ESD per Method 3015.7, achieved through integrated protection structures in its silicon-gate process. External ESD protection is not required for standard handling and board-level operation. However, in systems exposed to repeated high-energy transients (e.g., connector hot-plug), supplemental TVS diodes may still be advised-but the device itself withstands typical manufacturing and field ESD events without damage or parameter shift.

Is the MAX394CAP+ pin-compatible with other Maxim analog switches, and which ones?

Yes, the MAX394CAP+ is pin-compatible with the MAX333 and MAX333A in the same 20-pin SSOP, SO, or DIP footprints. This allows direct substitution in existing designs without PCB modification. Key shared characteristics include identical pin functions (INx, NOx, COMx, NCx, V+, V−, GND), matching logic thresholds, and compatible switching architecture-enabling seamless migration to the MAX394CAP+ for improved on-resistance, lower charge injection, and enhanced temperature stability.