MAX4643EUA+

Analog Switches, Multiplexers, Demultiplexers Overview

The MAX4643EUA+ is a monolithic dual single-pole/single-throw (SPST) CMOS analog switch from Analog Devices/Maxim Integrated. It operates on a single supply ranging from +1.8V to +5.5V and features one normally open (NO) channel and one normally closed (NC) channel. The device provides a maximum on-resistance of 4Ω at +5V and 8Ω at +3V, with guaranteed on-resistance flatness of 1Ω at +5V and match between channels of 0.6Ω. Switching times are fast, with typical turn-on and turn-off times under 20ns. Quiescent power consumption is less than 0.01µW, and leakage currents remain below 0.35nA across the full temperature range.

Analog Switches, Multiplexers, Demultiplexers Feature Summary

• Single-supply operation from +1.8V to +5.5V with rail-to-rail analog signal handling
• Low on-resistance with guaranteed flatness and channel matching for signal integrity
• Ultra-low quiescent power consumption suitable for battery-operated equipment
• Fast switching speeds with low charge injection and excellent AC characteristics

Analog Switches, Multiplexers, Demultiplexers Applications

• Battery-operated equipment
• Audio and video signal routing
• Low-voltage data-acquisition systems
• Sample-and-hold circuits
• Communications circuits

Analog Switches, Multiplexers, Demultiplexers Procurement Notes

Verify the component authenticity by checking the marking code against official Maxim Integrated documentation. Confirm the package type matches the specified 8-pin µMAX configuration. Ensure the operating environment stays within the -40°C to +85°C temperature range. Cross-reference the datasheet revision to ensure compatibility with design requirements. Validate that the supply voltage does not exceed the absolute maximum ratings.

Analog Switches, Multiplexers, Demultiplexers Selection Notes

Select the MAX4643EUA+ when a mixed NO/NC dual switch configuration is required in a compact footprint. Consider this part for applications demanding low power consumption and high-speed switching under single-supply conditions. Verify that the 4Ω on-resistance meets the signal path requirements at the intended supply voltage. Ensure the logic input levels are compatible with the system's digital control signals.

Analog Switches, Multiplexers, Demultiplexers Part Context

The MAX4643EUA+ belongs to the MAX4641/MAX4642/MAX4643 family of high-speed, low-voltage CMOS analog switches. While the MAX4641 offers two normally open channels and the MAX4642 provides two normally closed channels, the MAX4643 combines one of each. All variants share similar electrical characteristics regarding speed, power, and resistance but differ in their default switch states.

Analog Switches, Multiplexers, Demultiplexers Replacement Considerations

The MAX4641EUA+ serves as a functional substitute if two normally open switches are acceptable. The MAX4642EUA+ is an alternative if two normally closed switches are required. These parts share the same package and pinout but differ in internal switch configuration. Verify that the specific NO/NC combination of the MAX4643 is not critical for the replacement application.

Analog Switches, Multiplexers, Demultiplexers FAQ

What is the difference between the MAX4641, MAX4642, and MAX4643?

The MAX4641 contains two normally open (NO) switches, the MAX4642 contains two normally closed (NC) switches, and the MAX4643 contains one NO switch and one NC switch.

How does the on-resistance vary with supply voltage?

The on-resistance is guaranteed to be a maximum of 4Ω at a +5V supply and 8Ω at a +3V supply. Typical values are lower, around 2.5Ω at +5V and 6Ω at +3V.

Is the MAX4643EUA+ compatible with TTL logic levels?

TTL/CMOS compatibility is only valid for operation using a +5V supply. At lower supply voltages, the logic thresholds shift relative to the supply rail.