ISL43741IR-T

Analog Switches, Multiplexers, Demultiplexers Overview

The ISL43741IR-T is a precision, bidirectional analog switch configured as a differential 4-to-1 multiplexer/demultiplexer. It operates from single +2V to +12V or dual ±2V to ±6V supplies. The device features an inhibit and latch bar pin for state control. ON resistance is 39Ω at ±5V supply and 125Ω at +3.3V supply. Off-leakage current is 0.1nA at +25°C and 2.5nA at +85°C. Digital inputs have 0.8V to 2.4V logic thresholds for TTL/CMOS compatibility. Switching times at +5V are tON of 38ns and tOFF of 19ns. The component is housed in a 20-lead 4x4 QFN package.

Analog Switches, Multiplexers, Demultiplexers Feature Summary

• Bidirectional analog switching with differential 4-to-1 multiplexing capability
• Simultaneous signal path opening via inhibit pins and address locking via latch bar pin
• Rail-to-rail analog signal handling across specified supply ranges
• Guaranteed break-before-make switching action to prevent signal shorting

Analog Switches, Multiplexers, Demultiplexers Applications

• Medical Ultrasound imaging systems
• Magnetic Resonance Image (MRI) scanners
• CT and PET Scanners
• ADSL and VDSL Modems
• Operational Amplifier Gain Switching Networks

Analog Switches, Multiplexers, Demultiplexers Procurement Notes

Verify the specific ordering suffix against the manufacturer's datasheet to confirm packaging configuration. The 'T' suffix indicates tape and reel delivery format. Confirm RoHS compliance status and moisture sensitivity level classification prior to assembly. Ensure the procurement documentation matches the exact part number including all alphanumeric designators.

Analog Switches, Multiplexers, Demultiplexers Selection Notes

Select this component for applications requiring differential signal routing within low-voltage environments. Verify that the required on-resistance and leakage specifications align with the target supply voltage. Ensure digital control signals meet the specified TTL/CMOS logic thresholds for reliable operation. Consider thermal dissipation requirements based on the QFN package characteristics.

Analog Switches, Multiplexers, Demultiplexers Part Context

This device belongs to the Intersil ISL43681 and ISL43741 family of low-voltage analog switches. The ISL43741 specifically provides a differential 4-to-1 multiplexer configuration, whereas the companion ISL43681 offers a single 8-to-1 multiplexer. Both share identical electrical characteristics and package options.

Analog Switches, Multiplexers, Demultiplexers Replacement Considerations

ISL43681IR-T

Analog Switches, Multiplexers, Demultiplexers FAQ

How does the ISL43741 handle power supply sequencing?

Proper sequencing requires applying V+ and V- before any input signals to prevent forward biasing internal ESD protection diodes. Input signal voltages must remain between V+ and V-.

What is the function of the LE pin?

The LE (Latch Enable) pin allows the device to lock in the last switch address when connected to GND. Connecting it to +V enables normal operation.

Is the device compatible with 12V logic levels?

At 12V supply, the VIH level is approximately 3.3V. While below the CMOS guaranteed high output minimum of 4V, noise margin is reduced. Using a logic family with VOH greater than 4V is recommended for best results.