MAX4521EPE+

Analog Switches, Multiplexers, Demultiplexers Overview

The MAX4521EPE+ is a quad, low-voltage, single-pole/single-throw (SPST) analog switch manufactured by Analog Devices Inc./Maxim Integrated. It features four normally closed switches housed in a 16-pin Plastic DIP package with an operating temperature range of -40°C to +85°C. The device supports dual supplies from ±2V to ±6V or a single supply between +2V and +12V. Key electrical parameters include a maximum on-resistance of 100Ω, on-resistance flatness of 12Ω max, and channel-to-channel matching of 1Ω max. Off-leakage current is specified at 1nA at +25°C and 10nA at +85°C. Switching times are 80ns for turn-on and 30ns for turn-off under standard conditions.

Analog Switches, Multiplexers, Demultiplexers Feature Summary

• Four internally matched SPST analog switches capable of handling rail-to-rail analog signals within the supply voltage limits.
• TTL and CMOS logic-compatible digital inputs ensure reliable interfacing with standard logic families when powered by ±5V or +5V single supplies.
• Low power consumption combined with robust electrostatic discharge protection exceeding 2000V per Method 3015.7.

Analog Switches, Multiplexers, Demultiplexers Applications

• Battery-operated equipment requiring low power and wide voltage operation
• Data acquisition systems utilizing multiplexed signal paths
• Test and measurement instrumentation
• Avionics signal routing
• Audio signal routing networks

Analog Switches, Multiplexers, Demultiplexers Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the presence of the '+' suffix indicating RoHS compliance and lead-free construction. Ensure the ordering code matches the specific E-grade temperature rating (-40°C to +85°C) required for the application environment. Cross-reference the 16-PDIP package dimensions against PCB footprint specifications prior to procurement.

Analog Switches, Multiplexers, Demultiplexers Selection Notes

Select the MAX4521 variant specifically for applications requiring normally closed switch configurations upon power-up or logic low states. Verify that the system's analog signal range remains strictly within the positive and negative supply rails to prevent forward conduction of internal ESD protection diodes. Consider the 100Ω maximum on-resistance impact on signal attenuation in high-impedance circuits compared to lower resistance alternatives.

Analog Switches, Multiplexers, Demultiplexers Part Context

This component belongs to the MAX452x family of quad low-voltage analog switches, which also includes the MAX4522 (normally open) and MAX4523 (mixed NC/NO). The 'E' designation indicates the extended industrial temperature grade, while the 'P' suffix denotes the plastic DIP package style. This series is designed for general-purpose signal switching in portable and industrial electronics.

Analog Switches, Multiplexers, Demultiplexers Replacement Considerations

Publicly confirmed substitute part numbers include MAX4521CPE, MAX4521ESE, MAX4521EEE, MAX4521EUE, and MAX4521EGE. These variants share identical electrical characteristics but differ in operating temperature ranges or physical package types such as SO, QSOP, TSSOP, and QFN.

Analog Switches, Multiplexers, Demultiplexers FAQ

How does the MAX4521 handle analog signals that exceed the supply voltage rails?

Internal reverse-biased ESD protection diodes connect each analog-signal pin to both V+ and V-. If an analog signal exceeds these rails, one of these diodes conducts, clamping the voltage. Designers must limit the forward-diode current to the maximum rating to avoid damage.

What is the behavior of the logic-level thresholds when the supply voltage changes?

The logic-level thresholds are CMOS/TTL compatible at +5V. As the positive supply voltage (V+) increases toward +12V, the threshold level rises slightly to approximately 3.1V. This remains compatible with CMOS outputs but may exceed the minimum high-level output of some TTL devices.

Does the MAX4521 support break-before-make switching?

No, the MAX4521 consists entirely of normally closed switches and does not feature break-before-make timing. This functionality is only available in the MAX4523 variant, which contains two normally closed and two normally open switches.