Analog Devices Inc./Maxim Integrated MAX325CUA+T

Overview

MAX325CUA+T 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 100pA max off-leakage - enabling high-fidelity signal routing in battery-powered audio/video systems and precision data acquisition.

For engineers reviewing the MAX325CUA+T datasheet, MAX325CUA+T pinout, MAX325CUA+T application, or MAX325CUA+T equivalent, key selection criteria include verified break-before-make timing (2ns min), R_ON matching (<2Ω at +25°C), low-temperature leakage stability (<2.5nA at +85°C), and µMAX-8 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX325CUA+T implements complementary MOSFET pairs per switch with integrated level-shifting logic to ensure TTL/CMOS compatibility across its full +2.7V to +16V supply range. Its internal architecture guarantees break-before-make operation exclusively for the MAX325 variant - preventing momentary shorting during channel transitions in critical signal-path applications.

Each switch supports bidirectional analog signals from GND to V+, with R_ON flatness ≤6Ω over the full voltage range and temperature-stable leakage (<5nA over -40°C to +85°C). Charge injection is tightly controlled at ≤5pC, minimizing transient errors in sample-and-hold and DAC/ADC interface circuits.

Key Specifications

Pinout & Package

MAX325CUA+T is housed in an 8-pin µMAX package (pin pitch 0.65mm, body size 3.05mm × 3.05mm × 0.8mm), RoHS-compliant and optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX325CSA+, the MAX325CUA+T saves >70% board area while maintaining identical performance; versus ADG1419BRMZ, it trades lower R_ON for intrinsic break-before-make safety - critical in unattended or safety-critical multiplexing.

Availability

MAX325CUA+T is available at Aetrix Electronics and suitable for battery-operated instrumentation, medical sensor interfaces, and industrial DAC/ADC signal routing requiring stable component supply across extended product lifecycles.

Supply support for MAX325CUA+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, and communications markets since 1965.

The MAX323/MAX324/MAX325 family was engineered specifically for single-supply, low-leakage, low-charge-injection analog switching in portable and high-reliability systems - emphasizing parametric consistency across temperature and supply voltage.

FAQ

What is the guaranteed break-before-make timing specification for MAX325CUA+T?

The MAX325CUA+T guarantees a minimum break-before-make delay of 2ns under specified conditions (R_L = 300Ω, C_L = 35pF). This parameter is unique to the MAX325 variant and ensures no overlap between NC and NO connections during logic transitions - a critical feature for avoiding signal shorting in multiplexed sensor or audio paths. The timing is tested and guaranteed across the full operating temperature range.

Does MAX325CUA+T support rail-to-rail analog signal switching?

Yes, the MAX325CUA+T supports analog signals from GND to V+ across its full supply range (+2.7V to +16V). Its CMOS switch architecture allows bidirectional operation on all terminals (NO, NC, COM), and R_ON flatness remains ≤6Ω over the entire signal range - confirmed by characterization at V_COM = 1V, 2V, and 3V with V+ = 5V. This enables accurate switching of full-scale sensor outputs or DAC waveforms without clipping or distortion.

What is the maximum allowable supply voltage for MAX325CUA+T, and what happens if exceeded?

The absolute maximum supply voltage for MAX325CUA+T is +17V referenced to GND. Exceeding this rating risks permanent damage due to gate oxide breakdown or junction overvoltage. The device operates reliably up to +16V, and all electrical specifications (e.g., R_ON, leakage, switching speed) are characterized within the +2.7V to +16V range. Sustained operation above +16V voids parametric guarantees and may degrade long-term reliability even if immediate failure does not occur.

How does MAX325CUA+T perform at elevated temperatures, particularly regarding leakage current?

At +85°C, the MAX325CUA+T guarantees COM off-leakage ≤5nA and NO/NC off-leakage ≤5nA - validated per datasheet testing methodology. This is critical for high-impedance applications like thermocouple amplifiers or pH probes, where leakage-induced offset errors must remain below 1μV. The device's leakage remains stable up to +85°C, with no degradation beyond the specified limits, ensuring consistent performance in industrial enclosures or automotive under-hood environments.

Is MAX325CUA+T pin-compatible with other variants in the MAX323/MAX324/MAX325 family?

Yes, the MAX325CUA+T shares identical pinout and package (8-pin µMAX) with MAX323CUA+ and MAX324CUA+. All three variants use the same V+, GND, IN1, IN2, COM1, COM2, NO1/NC1, and NO2/NC2 pin assignments. However, their switch configurations differ: MAX323 has two NO switches, MAX324 has two NC switches, and MAX325 has one NO and one NC - so functional replacement requires verifying logic polarity and signal path requirements in the target application.