ISL43231IR-T

Analog Switches, Multiplexers, Demultiplexers Overview

The ISL43231IR-T is a triple single-pole double-throw (SPDT) analog switch manufactured by Renesas Electronics. It operates from a single +2V to +12V supply or dual ±2V to ±6V supplies. The device features an on-resistance of 50Ω maximum at ±4.5V and 155Ω maximum at +3V. Switching times include a turn-on time of 38ns and turn-off time of 19ns at +5V. It offers low charge injection of 1pC maximum, off-leakage current of 2.5nA maximum, and high off-isolation of 92dB. The component is housed in a 20-lead QFN package with an operating temperature range of -40°C to +85°C.

Analog Switches, Multiplexers, Demultiplexers Feature Summary

• Configured as a triple SPDT switch suitable for 2-to-1 multiplexer applications
• Features latch bar pin to lock the last switch address and inhibit pins to open all signal paths simultaneously
• Provides guaranteed break-before-make switching action to prevent signal shorting
• Supports rail-to-rail analog signals with TTL and CMOS logic compatibility

Analog Switches, Multiplexers, Demultiplexers Applications

• Battery powered, handheld, and portable equipment
• Communications systems including radios, telecom infrastructure, and ADSL/VDSL modems
• Test equipment such as medical ultrasound, MRI, CT scanners, and ATE
• Audio and video signal routing
• Sample and hold circuits and operational amplifier gain switching networks

Analog Switches, Multiplexers, Demultiplexers Procurement Notes

Verify the specific ordering suffix against the manufacturer's documentation to confirm tape and reel packaging requirements. Ensure the procurement specifications match the required temperature range and RoHS compliance status. Cross-reference the part marking with the official datasheet to validate authenticity and manufacturing origin before finalizing orders.

Analog Switches, Multiplexers, Demultiplexers Selection Notes

Select this component when a triple SPDT configuration is required for signal routing or multiplexing. Consider the on-resistance variations across different supply voltages, particularly for 3.3V and 5V single-supply designs. Evaluate the dynamic characteristics such as charge injection and switching speeds to ensure they meet the system's bandwidth and precision requirements.

Analog Switches, Multiplexers, Demultiplexers Part Context

The ISL43231 belongs to the Intersil family of low-voltage analog switches, now produced under Renesas Electronics. It is designed for precision applications requiring bidirectional signal switching with minimal distortion. The device integrates digital control inputs for address selection and state latching, making it a compact solution for complex signal management in space-constrained electronic designs.

Analog Switches, Multiplexers, Demultiplexers Replacement Considerations

Consult official substitution guides for verified alternative part numbers. Do not assume functional equivalence based solely on package type or pin count. Verify that any replacement matches the electrical specifications, particularly on-resistance and leakage currents, to maintain system performance integrity.

Analog Switches, Multiplexers, Demultiplexers FAQ

How does the ISL43231 handle power supply sequencing?

Proper power supply sequencing is required to protect the device. V+ and V- must be applied before any input signals to prevent forward biasing internal ESD protection diodes. Input signal voltages must remain between V+ and V- during operation.

What is the function of the latch bar pin?

The latch bar pin locks in the last switch address. When connected to GND, it captures the current state of the address inputs, allowing the switch configuration to be maintained without continuous addressing signals.

Is the ISL43231 compatible with both TTL and CMOS logic?

Yes, the device features digital inputs with 0.8V to 2.4V logic thresholds, ensuring compatibility with both TTL and CMOS logic families when using single +3.3V or +5V supplies or dual ±5V supplies.