Analog Devices Inc./Maxim Integrated MAX4502EUK-T

Overview

MAX4502EUK-T from Maxim Integrated is a normally closed (NC), single-pole/single-throw (SPST), low-voltage CMOS analog switch operating from +2V to +12V single supply, delivering 250Ω on-resistance at +5V, 1nA off-leakage at +25°C, and rail-to-rail analog signal handling - used in battery-powered audio routing and low-voltage data-acquisition front-ends.

For engineers reviewing the MAX4502EUK-T datasheet, MAX4502EUK-T pinout, MAX4502EUK-T application, or MAX4502EUK-T equivalent, this page provides verified package mapping (SOT23-5), confirmed NC switching behavior, guaranteed leakage specs across temperature, switching timing (tON = 75ns, tOFF = 50ns), and real-world design context for portable and precision analog signal path selection.

Technical Context

The MAX4502EUK-T implements a CMOS transmission-gate architecture with dual ESD diodes per analog terminal (to V+ and GND), enabling rail-to-rail operation while defining leakage paths strictly between signal pins and supply rails - not between COM/NO/NC terminals. Its logic interface uses fixed 0.8V/2.4V thresholds for TTL/CMOS compatibility at +5V.

Unlike bidirectional digital switches, the MAX4502EUK-T supports symmetrical analog conduction: COM, NO, and NC are functionally interchangeable signal terminals; the NC state is defined by internal gate biasing, not external topology. Switching speed and charge injection (10pC) are characterized under 1kΩ load and 35pF capacitance per standard test circuits.

Key Specifications

Pinout & Package

SOT23-5 package: 5-pin surface-mount, moisture-sensitive level 1, footprint compatible with industry-standard SOT-23 land pattern (JEDEC TO-236AB). Thermal resistance θJA = 140°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4502EXK-T, the MAX4502EUK-T offers lower thermal resistance and proven reliability in SOT23-5 production builds; versus ADG801BRMZ, it delivers tighter leakage control at elevated temperatures but higher RON - making it optimal for battery-powered instrumentation where leakage-induced drift must be minimized.

Availability

MAX4502EUK-T is available at Aetrix Electronics and suitable for battery-operated equipment, audio/video signal routing, and low-voltage data-acquisition systems requiring stable component supply across industrial temperature ranges (-40°C to +85°C).

Supply support for MAX4502EUK-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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.

The MAX4501/MAX4502 family was engineered specifically for low-voltage, low-leakage analog signal routing in portable and high-impedance measurement systems - emphasizing rail-to-rail operation, nanoscale leakage control, and robust single-supply logic interfacing.

FAQ

What is the default state of the MAX4502EUK-T switch?

The MAX4502EUK-T is a normally closed (NC) SPST analog switch: when the IN pin is held LOW (≤0.8V), the COM and NC terminals are conductive; applying HIGH logic (>2.4V) to IN opens the path. This default-closed behavior ensures fail-safe signal continuity during power-up or controller reset - a key requirement in audio routing and sensor monitoring where open-circuit faults must be avoided. The MAX4502EUK-T achieves this via internal gate biasing, not external pull resistors.

Can the MAX4502EUK-T operate from a 3.3V supply?

Yes, the MAX4502EUK-T operates across +2V to +12V single supply, including 3.3V. At +3.3V, on-resistance rises to ~600Ω (typical), off-leakage remains ≤1nA at +25°C, and logic thresholds scale proportionally (~0.5V/1.6V). It maintains rail-to-rail analog swing from 0V to 3.3V, making it suitable for mixed-voltage systems interfacing with 3.3V MCUs. However, tON/tOFF increase slightly versus +5V operation - verify timing margins in 3.3V data-acquisition designs using the MAX4502EUK-T.

How does the MAX4502EUK-T handle analog signals exceeding the supply rails?

Each analog terminal (COM, NC) has ESD diodes connected to V+ and GND. If an analog signal exceeds V+ or drops below GND, the corresponding diode conducts, clamping the voltage and limiting current to ±10mA continuous. This protects the MAX4502EUK-T but requires external series resistance to prevent damage - e.g., a 1kΩ resistor limits fault current to <1mA for a 1V overvoltage. The MAX4502EUK-T is not designed for sustained operation outside its supply rails; such conditions induce increased leakage and potential parametric shift.

Is the MAX4502EUK-T pin-compatible with the MAX4501EUK-T?

No - although both use SOT23-5 packaging and share identical pinouts (V+, NC/NO, IN, GND, COM), the MAX4502EUK-T and MAX4501EUK-T have opposite switching logic: MAX4502EUK-T is NC (closed at IN = LOW), while MAX4501EUK-T is NO (open at IN = LOW). Swapping them without inverting the control signal causes functional failure. Their electrical specs (RON, leakage, timing) are otherwise matched, but the MAX4502EUK-T cannot serve as a drop-in replacement for the MAX4501EUK-T without firmware or schematic modification.

What is the maximum frequency for reliable signal switching with the MAX4502EUK-T?

The MAX4502EUK-T maintains <0.1dB flatness up to ~2MHz in 50Ω systems, with -60dB off-isolation at 10MHz decreasing ~20dB/decade. For audio applications (<20kHz), it delivers <0.01% THD; for RF or high-speed digital signals, parasitic capacitance (3pF off-capacitance) causes roll-off and crosstalk. Use the MAX4502EUK-T in baseband analog routing - not RF switching. For >10MHz isolation, add external filtering or select a dedicated RF switch; the MAX4502EUK-T's design intent is precision low-frequency signal path control.