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Product Detailed Parameters
- Description：RAIL-TO-RAIL, OPEN-DRAIN COMPARA
- Series：*
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：-
- Number of Elements：-
- Output Type：-
- Voltage - Supply, Single/Dual (±)：-
- Voltage - Input Offset (Max)：-
- Current - Input Bias (Max)：-
- Current - Output (Typ)：-
- Current - Quiescent (Max)：-
- CMRR, PSRR (Typ)：-
- Propagation Delay (Max)：-
- Hysteresis：-
- Operating Temperature：-
- Package / Case：-
- Mounting Type：-
- Supplier Device Package：-
- Grade：-
- Qualification：-
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Overview
The TS3121AILT is a single rail-to-rail open-drain comparator from STMicroelectronics, featuring an embedded guaranteed start-up time. 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 offers low power consumption with a typical operating current of 70 μA and a maximum input offset voltage of 2 mV at 25 °C for the A-grade version. Propagation delay is specified at 60 ns. It includes high ESD tolerance of 4 kV HBM and is qualified under AEC-Q100 standards.
Feature Summary
- Rail-to-rail input capability allows full signal swing across the supply range.
- Open-drain output stage withstands voltages higher than VCC for level shifting.
- Embedded guaranteed start-up time ensures stable output upon power activation.
- High robustness with 4 kV HBM ESD tolerance and AEC-Q100 qualification.
Applications
- Industrial control systems
- Automotive electronics
- Power tools
- Overcurrent protection circuits
- Controllers and sensors
Procurement Notes
Verify the specific ordering suffix 'LT' corresponds to the SOT23-5 package configuration as indicated in the datasheet pinout section. Confirm that the A-grade designation matches the required 2 mV maximum input offset voltage specification for your application accuracy needs. Ensure compatibility with the SC70-5 or SOT23-5 footprint during PCB layout planning.
Selection Notes
Select this component when space-constrained designs require a single-channel comparator with rail-to-rail inputs. It is suitable for applications demanding low power consumption alongside fast response times. Consider the guaranteed start-up feature if sequential power switching is present. Verify that the open-drain output architecture aligns with the pull-up requirements of the downstream circuitry.
Part Context
This part belongs to the TS3121 family of analog comparators designed for industrial and automotive environments. The series includes variants with different features such as Power-on Reset (TS3121P) or fail-safe inputs. The TS3121AILT specifically represents the A-grade version with optimized offset voltage characteristics, packaged in a compact form factor to reduce PCB area.
Replacement Considerations
For lower supply current, consider the TS880. For higher speed performance, evaluate the TS3011. If a push-pull output is required instead of open-drain, the TS3021 is a compatible alternative within the same product family.
