Analog Devices Inc./Maxim Integrated MAX325EPA+

Overview

MAX325EPA+ from Analog Devices is a precision dual SPST analog switch with one normally open (NO) and one normally closed (NC) channel, designed for single-supply operation from +2.7V to +16V. It delivers 60Ω max on-resistance, <5pC charge injection, guaranteed break-before-make switching, and operates across -40°C to +85°C in an 8-pin plastic DIP package-ideal for battery-powered audio/video routing and precision sample-and-hold circuits.

For engineers reviewing the MAX325EPA+ datasheet, MAX325EPA+ pinout, MAX325EPA+ application, or MAX325EPA+ equivalent, key selection criteria include its guaranteed break-before-make timing (2ns), R_ON flatness (<6Ω), low leakage (<2.5nA at +85°C), TTL/CMOS logic compatibility, and ESD robustness (>2000V per Method 3015.7).

Technical Context

The MAX325EPA+ integrates two independent CMOS SPST switches sharing a common V+ supply and GND reference, with separate IN1/IN2 logic controls driving COM1–NO1/NC1 and COM2–NO2/NC2 paths. Its internal architecture ensures strict break-before-make operation exclusively for the MAX325 variant, preventing signal shorting during state transitions.

It supports rail-to-rail analog signal switching (0V to V+) with minimal R_ON variation over voltage and temperature, and features bidirectional current capability up to 30mA continuous per terminal. Charge injection is tightly controlled (<5pC) to minimize sampling error in precision data acquisition systems.

Key Specifications

Pinout & Package

MAX325EPA+ uses an 8-pin plastic DIP (Dual In-line Package) with 0.300-inch body width, RoHS-compliant lead finish, and through-hole mounting. Pin 1 is NO1 (MAX325) or NC1 (MAX324), pin 4 is GND, pin 5 is NC2 (MAX325), pin 8 is V+, and pins 2/6 are COM1/COM2 analog commons.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX325ESA+ and ADG1419BRUZ, the MAX325EPA+ uniquely combines guaranteed break-before-make timing, DIP package serviceability, and ultra-low leakage (<2.5nA) across extended temperature-making it the preferred choice for ruggedized, maintenance-sensitive, and safety-aware analog routing.

Availability

MAX325EPA+ is available at Aetrix Electronics and suitable for battery-operated systems, sample-and-hold circuits, heads-up displays, and military radio designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX325EPA+ 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 industrial, automotive, communications, and aerospace markets since 1965.

The MAX323/MAX324/MAX325 series was engineered specifically for precision, low-power, single-supply analog switching in portable and harsh-environment applications-emphasizing leakage control, charge injection minimization, and guaranteed timing behavior.

FAQ

What is the guaranteed break-before-make timing specification for MAX325EPA+?

The MAX325EPA+ guarantees a minimum break-before-make delay of 2ns under RL = 300Ω and CL = 35pF conditions, as specified in the datasheet's Electrical Characteristics table. This timing ensures no overlap conduction between the NO and NC paths during switching transitions-critical for preventing signal shorts in safety-critical routing. The feature is exclusive to the MAX325 variant and is not present in MAX323 or MAX324.

Does MAX325EPA+ support rail-to-rail analog signal switching?

Yes, the MAX325EPA+ supports analog signal switching from 0V to V+ across its entire specified supply range (+2.7V to +16V). Its bidirectional architecture allows NO, NC, and COM terminals to function as either inputs or outputs, and R_ON flatness remains under 6Ω over the full signal range-ensuring minimal distortion and gain error in precision applications like DAC output buffering and sensor signal conditioning.

What is the maximum allowable supply voltage for MAX325EPA+?

The absolute maximum supply voltage for MAX325EPA+ is +17V, as defined in the Absolute Maximum Ratings table. Operation beyond this limit risks permanent device damage. For reliable long-term performance, the recommended operating range remains +2.7V to +16V. Exceeding +17V-even momentarily-can trigger internal diode clamping and degrade ESD robustness or leakage performance.

How does MAX325EPA+ compare to MAX323EPA+ in terms of switch configuration?

The MAX325EPA+ integrates one normally open (NO) and one normally closed (NC) SPST switch, whereas the MAX323EPA+ contains two NO switches and the MAX324EPA+ contains two NC switches. This hybrid configuration enables unique functionality-such as fail-safe default routing-where one path is active when power is lost or logic is deasserted. Only MAX325EPA+ provides guaranteed break-before-make timing.

Is MAX325EPA+ compatible with TTL and CMOS logic levels?

The MAX325EPA+ is TTL-compatible when operated from a +5V supply, with VINL ≤ 0.8V and VINH ≥ 2.4V. At other supply voltages (e.g., +3.3V or +12V), rail-to-rail logic drive is required: IN1 and IN2 must be driven fully to GND and V+ to ensure correct switching and minimize power consumption. Driving logic inputs outside this range may result in undefined states or increased supply current.