74H1G66STR

Overview

The STMicroelectronics 74H1G66STR is a single bilateral analog switch fabricated in silicon gate C2MOS technology. It features a wide operating supply voltage range from 2V to 12V and operates across an extended temperature range of -55°C to 125°C. The device provides high-speed performance with a typical propagation delay of 4ns at 4.5V and low power dissipation, drawing a maximum quiescent current of 1μA at 25°C. It includes protection circuits against static discharge for ESD immunity. The component is housed in a SOT-23-5L surface-mount package.

Feature Summary

• Single-pole single-throw (SPST) configuration with two independent input/output terminals controlled by a digital enable input.
• Bilateral signal path allowing signals to pass in either direction between the I/O and O/I ports when enabled.
• High noise immunity with input thresholds defined as 28% of VCC minimum.
• Integrated protection circuits on all inputs and outputs to withstand static discharge and transient excess voltages.

Applications

• Signal routing in mixed-signal systems requiring low distortion.
• Data acquisition systems utilizing the switch for channel selection.
• Audio signal processing applications benefiting from low sine wave distortion characteristics.

Procurement Notes

Verify the specific ordering code suffix to confirm the tape and reel packaging format. Confirm that the required operating temperature range aligns with the specified -55°C to 125°C limits. Ensure the design accounts for the absolute maximum ratings, particularly regarding power dissipation derating above 65°C. Check for any RoHS compliance status updates relative to the manufacturing date.

Selection Notes

Select this component when a wide supply voltage range up to 12V is required for analog switching. Consider the typical on-resistance values which vary significantly based on the supply voltage and load current. Evaluate the capacitive characteristics, such as the 10pF switch terminal capacitance, for high-frequency signal integrity requirements. Compare the propagation delay specifications against system timing constraints.

Part Context

The 74H1G66 belongs to the standard 74H series of CMOS logic devices manufactured by STMicroelectronics. This series is characterized by high-speed operation combined with true CMOS low power consumption. The device utilizes silicon gate C2MOS technology to achieve its performance metrics while maintaining compatibility with standard CMOS output levels for control logic.

Replacement Considerations

Direct replacements must match the SPST bilateral switch topology and the SOT-23-5L package. Verify that alternative components support the 12V maximum supply voltage and the -55°C to 125°C temperature range. Check if the substitute offers comparable on-resistance and propagation delay specifications for the target application voltage.