STPM33TR - Dual 24-Bit Energy Metering AFE | STMicroelectronics
MPN： STPM33TR ✓ 啟用中STPM33TR 概覽
An energy-metering AFE combines analog signal conditioning, sigma-delta conversion, and measurement processing close to the power-line input. Within the hierarchy of analog front ends, energy-metering ICs, data converters, and power-management semiconductors, this device reduces the need for separate precision converters and preserves low-noise current measurement down to appliance standby levels.
The verified device description identifies up to four independent 24-bit second-order sigma-delta ADC channels and two embedded PGLNAs. A 4 MHz oscillator provides the timing reference for the conversion system, while the high-resolution channels support accurate voltage, current, active-energy, and reactive-energy calculations. The 32-QFN package supports compact meter designs without requiring a larger through-hole footprint.
The STPM3x family is specifically designed for power-line energy measurement using Rogowski-coil, current-transformer, or shunt-current sensors. By integrating measurement channels and analog gain around the sensor interface, the device helps simplify calibration and reduce sensitive high-impedance routing between external analog circuitry and a metering MCU.
Typical uses include single-phase residential electricity meters, smart meters, industrial energy monitors, appliance sub-metering, power-factor monitoring, and DC energy measurement. The same AFE architecture can be used where the design must measure very low current levels, including equipment that spends substantial time in standby.
PCB implementation should follow the manufacturer datasheet for QFN thermal-pad assembly, analog grounding, sensor filtering, and exposed-pad connection. Input protection and isolation are application-specific and cannot be assumed from the listed operating range. Before layout release, confirm every pin, voltage, current, accuracy, and calibration parameter against the official STMicroelectronics datasheet.
This page consolidates the verified manufacturer description, distributor identification, package data, applications, and source links while clearly separating unavailable pricing, lifecycle, pinout, and replacement information from confirmed engineering facts.
直接替換替代品，適用於 STPM33TR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： STPM33TR （相同外形與佔位） — 差異在於 ADC Architecture, ADC Resolution, Package, Product Type.
此產品無可直接替換的替代品。
申請替代品STPM33TR 最大額定值與電氣特性
| Product Type | Energy metering analog front end |
| Number of Single-Phase Meter Channels | 2 channels |
| ADC Architecture | Second-order sigma-delta |
| Independent ADC Count | Up to 4 |
| ADC Resolution | 24 bit |
| Oscillator Frequency | 4 MHz |
| Embedded PGLNA Count | 2 |
| Supported Current Sensors | Rogowski coil, current transformer, or shunt current sensor |
| Measurement Type | DC and AC energy measurement |
| Supply Voltage Range | 2.95 V to 3.65 V |
| 封裝 | 32-QFN, 5 x 5 mm |
| 安裝類型 | Surface mount |
STPM33TR 32-qfn, 5 x 5 mm 腳位配置指南
STPM33TR（32-qfn, 5 x 5 mm 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： STPM33TR.
請參閱 資料表 以查看完整腳位配置。
典型應用
STPM33TR 適用於 6 應用s: Residential Smart Electricity Meters, Standby-Current Energy Monitoring, Industrial Single-Phase Submeters, Appliance Power-Monitoring Modules, DC Fast-Charger Energy Meters, Power-Factor Monitoring Systems.
Residential Smart Electricity Meters
The STPM33TR fits a compact single-phase smart meter because it provides up to four independent 24-bit second-order sigma-delta ADC channels and two embedded PGLNAs for voltage-and-current acquisition. Its 32-QFN 5 x 5 mm package saves board area beside the metering controller and communications hardware. The device supports current-transformer, shunt, or Rogowski-coil signal chains. Final class-accuracy compliance still depends on the selected sensors, calibration, reference design, and applicable regional test procedure.
推薦
Standby-Current Energy Monitoring
The STPM33TR is suitable for measuring the very low currents typical of household appliances in standby. Its 24-bit sigma-delta conversion architecture and embedded PGLNAs provide the resolution and signal conditioning needed to preserve measurement information in a wide dynamic range. Use the device for DC or AC load characterization when the selected shunt or transformer can resolve the minimum target current. Sensor error, offset calibration, and PCB leakage can become dominant below the ADC’s intrinsic resolution.
推薦
Industrial Single-Phase Submeters
The STPM33TR supports industrial energy submeters that must measure one or two single-phase loads with compact analog acquisition. Up to four 24-bit second-order sigma-delta channels can support coordinated voltage and current measurements, while two embedded PGLNAs reduce the external gain-stage burden for compatible current sensors. The 5 x 5 mm QFN is useful where panel space is constrained. Installation protection, galvanic isolation, and safety capacitors remain separate design requirements determined by the end application.
推薦
Appliance Power-Monitoring Modules
The STPM33TR can form the measurement core of an appliance power-monitoring module that records active energy, load events, and operating profiles. Its two single-phase metering channels and embedded PGLNAs suit compact systems using shunt or supported transformer sensors. At appliance scale, a 32-QFN 5 x 5 mm package helps preserve enclosure volume for the power stage and communications. Software must apply the appropriate voltage, current, offset, gain, and energy calibration constants before reporting measurements.
推薦
DC Fast-Charger Energy Meters
The verified capability for DC energy measurement makes the STPM33TR relevant to metering in DC power systems, provided its voltage and current inputs remain within the complete application limits. A shunt can provide a proportional voltage across the ADC front end, while the sigma-delta channels support accurate digital acquisition. The device is not a replacement for overvoltage, overcurrent, short-circuit, or isolation protection. Those functions and their safety margins must be designed separately for fast-charging hardware.
推薦
Power-Factor Monitoring Systems
The STPM33TR can support power-factor monitoring by acquiring voltage and current waveforms with synchronized metering channels. Its up-to-four 24-bit second-order sigma-delta architecture provides the numeric resolution needed for digital real- and reactive-power algorithms, while two PGLNAs help amplify compatible current-sensor outputs. Designers should preserve the datasheet-recommended analog and digital layout because mains-derived nodes can introduce noise, ground shifts, and timing errors. A successful design also requires local isolation or protection appropriate to the installation class.
推薦
推薦產品摘要
工程參考資料，適用於 STPM33TR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Package | 32-QFN, 5 x 5 mm |
| Brand | STMicroelectronics |
| Single-Phase Meter Channels | 2 |
| Independent ADCs | Up to 4 |
| ADC Resolution | 24 bit |
| ADC Architecture | Second-order sigma-delta |
| Oscillator Frequency | 4 MHz |
| Embedded PGLNA Count | 2 |
| Supply Voltage Range | 2.95 V to 3.65 V |
| Supported Sensor Types | Rogowski coil, current transformer, and shunt current sensor |
主要差異化特點
- Metering-focused integration (對比Discrete ADC and op-amp signal chain)
- Dual single-phase meter positioning (對比General-purpose energy-monitoring MCU without dedicated AFE)
- Sensor-interface flexibility (對比Shunt-only measurement front end)
- Compact metering footprint (對比Discrete multi-chip analog front end)
設計說明
Follow the STMicroelectronics QFN land pattern and exposed-pad connection exactly, including the number and geometry of thermal vias specified by the family datasheet. Preserve the pin-1 orientation and keep analog sensor inputs away from switching nodes, high-current conductors, crystal circuitry, and digital clock traces. Because the verified data does not enumerate the STPM33TR pinout, verify every net against the official package drawing rather than inferring assignments from another STPM3x member.
Treat the reference, analog supply, current-sensor inputs, voltage channels, and digital interface as distinct layout domains. Use the shortest practical sensor traces, keep the analog return path continuous, and place decoupling and filtering components at the relevant device pins. Grounding and filtering cannot compensate for a poorly selected shunt, transformer, Rogowski-coil return, or protection network, so validate those interfaces against the datasheet application information before layout.
Do not assume that a 24-bit converter automatically delivers 24-bit billing accuracy. Offset, gain, linearity, phase error, clock accuracy, sensor tolerance, PCB leakage, and calibration determine system performance. Develop offset and gain calibration procedures for each production unit, and test the complete meter across current, voltage, waveform, temperature, and power-factor conditions required by the target application.
Operate the verified 2.95 V to 3.65 V supply range with enough tolerance margin for regulator variation and transient noise. Place local supply-decoupling components at the package pins using the values and layout rules in the official datasheet. Do not infer the exposed pad’s electrical connection or allowable thermal-current relationship from generic QFN practice; both must be confirmed for STPM33TR before release.
合規資訊
No explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations were included in the verified data. AEC-Q100 is not applied because this is an energy-metering AFE rather than an automotive-qualified device in the supplied evidence.
