TS3121AICT

Overview

The TS3121AICT is a single rail-to-rail open-drain comparator from STMicroelectronics, designed for industrial and automotive applications. It operates within a supply voltage range of 1.7 V to 5.5 V and supports an extended temperature range from -40 °C to +125 °C. The device features AEC-Q100 qualification, low power consumption with a typical supply current of 70 μA, and a guaranteed start-up time of 15 μs. It offers high ESD tolerance of 4 kV HBM and includes safety capable documentation for functional safety system design.

Feature Summary

• Rail-to-rail input capability allows accurate signal comparison across the full supply voltage range.
• Open-drain output stage withstands voltages higher than VCC, enabling level shifting applications.
• Embedded fail-safe architecture ensures stable operation even when inputs are biased while VCC is at 0 V.
• Guaranteed start-up time ensures known output conditions upon power activation.

Applications

• Industrial control systems
• Automotive electronics
• Power tools
• Overcurrent protection circuits
• Controllers and sensors

Procurement Notes

Verify the specific ordering suffix ICT corresponds to the SC-70-5 package and cut tape delivery format required for your assembly process. Confirm that the A-grade version specifications, such as the maximum input offset voltage of 2 mV at 25 °C, align with your circuit's precision requirements. Ensure compatibility with the 1.7 V to 5.5 V supply voltage range and check if the guaranteed start-up time meets your system's power sequencing constraints.

Selection Notes

Select this component when space-constrained designs require a single-channel comparator with rail-to-rail inputs and open-drain outputs. It is suitable for applications needing robust performance in harsh environments due to its wide temperature range and high ESD tolerance. Consider the TS3121AICT over other variants if AEC-Q100 qualification and specific offset voltage grades are necessary for your industrial or automotive project.

Part Context

The TS3121AICT belongs to the TS3121 family of single comparators manufactured by STMicroelectronics. This series is engineered to provide high-speed response times combined with low power consumption. The family includes variants with different features, such as the TS3121P which incorporates a Power-on Reset circuit, whereas the TS3121A focuses on guaranteed start-up times and precise offset characteristics.

Replacement Considerations

For lower supply current requirements, consider the TS880. For higher speed performance, the TS3011 is available. If a push-pull output configuration is needed instead of open-drain, the TS3021 serves as a compatible alternative within the product portfolio.

FAQ

Does the TS3121AICT include a Power-on Reset (PoR) circuit?

No, the TS3121AICT does not include a Power-on Reset circuit. This feature is specific to the TS3121P version. The TS3121A provides a guaranteed start-up time instead.

What is the maximum input offset voltage for the TS3121A?

The maximum input offset voltage for the TS3121A is 2 mV at 25 °C. At minimum operating temperatures, it can reach up to 15 mV.

Can the output pin handle voltages higher than the supply voltage?

Yes, the open-drain output stage includes a dedicated ESD clamp that allows the output pin to withstand voltages higher than VCC, making it suitable for level shifting applications.