STPM33TR

Overview

The STPM33TR is a single-phase energy metering IC from STMicroelectronics, designed for high-accuracy power measurement in utility applications. It integrates two programmable gain amplifiers and four independent 24-bit second-order sigma-delta ADCs with a 4 MHz oversampling frequency. The device supports input voltages from -300 mV to 4.2 V and operates on a 3.3 V supply (2.95 V to 3.65 V) with a typical current consumption of 4.6 mA. It achieves an active power accuracy of less than 0.1% error over a 5000:1 dynamic range and less than 0.5% over a 10000:1 range. The IC features a hardwired DSP, digital filtering, and serial communication interfaces including UART and SPI.

Feature Summary

• Provides instantaneous voltage and current waveforms along with calculated RMS values, active, reactive, and apparent power and energies.
• Includes a hardwired DSP and digital filtering stage for fast single-point system calibration across the entire current dynamic range.
• Supports tamper monitoring and detection functions for under/overvoltage (sag/swell) and overcurrent conditions.
• Features programmable LED and interrupt outputs alongside serial communication interfaces with CRC verification.

Applications

• Single-phase smart meters
• Energy metering solutions
• Power line systems using Rogowski coils, current transformers, or shunt sensors

Procurement Notes

Verify the specific suffix 'TR' indicates the reel packaging format when sourcing. Confirm the operating temperature range requirements against the datasheet specifications, as industrial variants may differ. Ensure compatibility with the required serial interface configuration (UART or SPI) during the design phase. Check moisture sensitivity levels and storage conditions prior to assembly to prevent package damage.

Selection Notes

Select this component for applications requiring Class 0.2 accuracy compliance with EN 50470-x and IEC 62053-2x standards. It is suitable for designs utilizing shunt, CT, or Rogowski coil sensing methods. Consider the 32-QFN package constraints for PCB layout. Evaluate the need for dual-mode apparent energy calculation and specific dynamic range requirements before finalizing the bill of materials.

Part Context

The STPM33TR belongs to the STPM3x family of ASSPs designed for high-accuracy power and energy measurement. This family shares common analog and digital architecture features, including programmable gain amplifiers and sigma-delta ADCs. The STPM33 variant specifically targets single-phase metering applications, distinguishing itself within the broader portfolio through its specific channel configuration and calibration capabilities.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult official STMicroelectronics resources for cross-reference information or equivalent series components such as other members of the STPM3x family if pin-out compatibility is required.