TS3121AIYLT

Overview

The TS3121AIYLT is a single rail-to-rail analog comparator from STMicroelectronics, featuring an open-drain output and embedded Power-on Reset (PoR) circuitry. 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 A-grade version guarantees a low input offset voltage of 2 mV maximum at 25 °C. Typical power consumption is 70 μA, with a propagation delay of 60 ns. The device is AEC-Q100 qualified for automotive applications and offers high ESD tolerance of 4 kV HBM.

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 Power-on Reset ensures a known high-impedance output state during power-up sequences.
• Guaranteed start-up time prevents false triggering during supply ramp-up cycles.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'YL' corresponds to the SC70-5 package configuration required for your PCB layout. Confirm that the A-grade offset voltage specifications meet your system accuracy requirements. Ensure the design accommodates the open-drain output by selecting appropriate pull-up resistor values. Validate that the component meets AEC-Q100 qualification standards if deployed in automotive environments.

Selection Notes

Select this comparator when space-constrained designs require a single-channel solution with integrated reset functionality. The A-grade variant is suitable for precision threshold detection where minimal offset voltage drift is critical. Consider the TS3121P variant if explicit power-on reset timing is mandatory, or the standard TS3121/TS3121A if guaranteed start-up time suffices. Evaluate the trade-off between the 60 ns propagation delay and the 70 μA quiescent current for your power budget.

Part Context

This component belongs to the TS3121 family of high-speed, low-power comparators designed for industrial and automotive markets. The family includes variants with different reset features and grades, all sharing the same core architecture and small footprint. The TS3121AIYLT specifically denotes the A-grade performance level packaged in SC70-5, providing enhanced DC accuracy compared to standard industrial versions.

Replacement Considerations

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

FAQ

How does the Power-on Reset feature function?

The embedded Power-on Reset circuit keeps the output in a high-impedance state until the supply voltage crosses 1.5 V and the internal transistors are correctly biased, ensuring a known output condition after a maximum delay of 15 µs.

What is the maximum input offset voltage for the A-grade version?

The TS3121A guarantees a maximum input offset voltage of 2 mV at 25 °C.

Can the output voltage exceed the supply voltage?

Yes, the dedicated ESD clamp in the open-drain output stage allows voltage levels higher than VCC to be applied to the output pin, facilitating level shifting applications.