TSM109AIDT

Overview

The TSM109AIDT is a dual analog comparator and voltage reference IC manufactured by STMicroelectronics. It integrates two comparators with PNP input stages and a fixed 2.5V shunt voltage reference in an 8-pin SOIC package. The device operates on a single supply from 2V to 36V or dual supplies of ±1V to ±18V, consuming 1.1mA independent of voltage. Key electrical parameters include a typical input bias current of 25nA, input offset voltage of ±1mV, and a response time of 1.3µs. The integrated reference offers 0.4% precision with a sink capability up to 100mA.

Feature Summary

• Integrates two high-speed comparators with low input bias current and wide common-mode range including ground.
• Includes a stable 2.5V shunt voltage reference with high sink current capability for external regulation.
• Features PNP input stage architecture ensuring constant bias current independent of output state.

Applications

• Power supply management systems requiring voltage monitoring and control.
• Data acquisition systems utilizing the internal reference for signal conditioning.
• Over-voltage and under-voltage protection circuits.

Procurement Notes

Verify component authenticity through authorized distributors as this part may be subject to discontinuation notices. Confirm that the specific ordering suffix DT corresponds to the Tape & Reel packaging variant required for automated assembly processes. Ensure compliance with RoHS directives and check for any Product Change Notifications (PCN) affecting package markings or materials before finalizing procurement orders.

Selection Notes

Select this component when space savings are critical due to its monolithic integration of dual comparators and a voltage reference. It is suitable for applications requiring a wide input common-mode range that includes ground potential. Consider the 1.1mA supply current consumption and the specific 2.5V reference precision requirements against alternative discrete solutions.

Part Context

This device belongs to the TSM109 family of analog mixed-signal ICs designed for cost-effective system integration. It serves as a compact alternative to using separate comparator and reference components. The SO-8 package variant provides a surface-mount solution compatible with standard PCB manufacturing processes for industrial and commercial electronics.

Replacement Considerations

Check for official EOL notifications and substitute part numbers provided by STMicroelectronics. Verify pinout compatibility and electrical parameter alignment if considering cross-brand alternatives.

FAQ

What is the input configuration of the comparators?

The comparators utilize a PNP input stage, which results in an input bias current that flows out of the IC and remains essentially constant regardless of the output state.

Can the input common-mode voltage go negative?

The input common-mode voltage range includes ground (0V), but it should not go negative by more than 0.3V relative to the negative power supply.