ACS37800KMACTR-030B3-I2C - Isolated ±30A AC/DC Power Monitor | Allegro
部品番号: ACS37800KMACTR-030B3-I2C ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $7.02 | $7.02 |
| 10 | $6.32 | $63.20 |
| 100 | $5.62 | $562.00 |
| 500 | $5.05 | $2,525.00 |
| 1,000 | $4.5 | $4,500.00 |
ACS37800KMACTR-030B3-I2C 概要
A power monitoring IC combines current sensing, voltage sensing, and computational resources to compute real power, apparent power, reactive power, RMS values, and energy on-chip, freeing the system MCU from these tasks. The ACS37800 family belongs to the broader category of integrated Hall-effect current sensor ICs and is positioned above discrete shunt-resistor amplifiers because it provides inherent galvanic isolation without an external isolation barrier, reducing PCB area, BOM count, and firmware complexity.
Key features of the -030B3-I2C variant include ±30 A bidirectional current range, factory-trimmed gain and phase calibration, integrated voltage divider with programmable ratio, zero-crossing detection for AC line synchronization, user-programmable thresholds and response times, and built-in temperature compensation. The reinforced isolation supports 5 kVRMS withstand voltage, and the digital interface delivers 16-bit voltage and current readings with integrated energy accumulators.
The architecture pairs a Hall-effect sensor element with a sigma-delta ADC and a dedicated DSP-style calculation engine. Each conversion cycle updates VRMS, IRMS, active power, reactive power, apparent power, power factor, and frequency. The integrated voltage channel allows single-package implementation of single-phase power metering without external PTs or high-voltage op-amps.
Typical applications include AC/DC power supplies, server and telecom PSU load monitoring, smart circuit breakers, sub-metering and e-Metering, solar inverters, EV charging stations, industrial motor drives, and battery management systems. The I2C variant specifically targets designs where a host MCU samples telemetry on demand rather than the SPI variant's continuous high-speed data stream.
Designers should follow Allegro's PCB layout guidelines for the MA package: keep high-voltage traces outside the reinforced-isolation creepage region and provide adequate copper pours for thermal dissipation at high DC currents. Compared with discrete shunt + op-amp + isolator solutions, this IC reduces CPU cycles and PCB area by integrating isolation, sensing, and calculation.
ドロップイン代替品: ACS37800KMACTR-030B3-I2C — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ACS37800KMACTR-030B3-I2C （同一形状・フットプリント） — 相違点: Package, Current Sensing Range, Digital Interface, Operating Temperature.
クイック比較ツール — 並列比較する代替部品を選択:
ACS37800KMACTR-030B3-SPI
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ACS37800KMCTR-030B3-I2C-A
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ACS37800KMACTR-030B2-I2C
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ACS37800KMACTR-030B3-I2C 最大定格＆電気的特性
| 機能 | Isolated AC/DC power monitoring IC (voltage, current, power, energy) |
| Current Range | -30 A to +30 A bidirectional |
| Voltage Range | 480 VRMS nominal, up to ±980 V peak |
| Supply Voltage (VCC) | 3.3 V |
| Digital Interface | I2C |
| Isolation Voltage | 5 kVRMS reinforced |
| パッケージ | 16-SOIC (MA), surface mount |
| 動作温度 | -40 C to +125 C |
| 出力タイプ | Digital (I2C, programmable) |
| チャネル数 | 1 (combined voltage and current) |
| Zero-Cross Detection | Yes (with time-based hysteresis) |
| Gain/Phase Calibration | Factory trimmed |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant |
| Tape and Reel Quantity | 1000 pieces per reel, 3000 pieces per box |
ACS37800KMACTR-030B3-I2C ピン構成
| ピン 1 | VCC — 3.3 V low-voltage supply |
| ピン 2 | GND — Low-voltage ground |
| ピン 3 | SDA — I2C data |
| ピン 4 | SCL — I2C clock |
| ピン 5 | INT — Interrupt output (alert) |
| ピン 6 | RESETn — Active-low reset |
| ピン 7 | ADDR — I2C address selection |
| ピン 8 | NC — Not connected (per datasheet) |
| ピン 9 | VINP — Voltage channel positive input |
| ピン 10 | VINN — Voltage channel negative input |
| ピン 11 | IP+ — Primary current conductor (in) |
| ピン 12 | IP+ — Primary current conductor (in, continuation) |
| ピン 13 | IP- — Primary current conductor (out) |
| ピン 14 | IP- — Primary current conductor (out, continuation) |
| ピン 15 | NC — Not connected (per datasheet) |
| ピン 16 | NC — Not connected (per datasheet) |
主な用途
ACS37800KMACTR-030B3-I2C の用途: 7 件s: Single-Phase AC Mains Power Monitoring, Server / Telecom PSU Load Monitoring, Solar Inverter DC/AC Monitoring, EV Charging Station Energy Metering, Industrial Motor Drive / Smart Breaker, Battery Management / Energy Storage Systems, Smart Home Sub-Metering and IoT Energy Monitors.
Single-Phase AC Mains Power Monitoring
The ACS37800KMACTR-030B3-I2C is purpose-built for single-phase AC mains power monitoring. Its 480 VRMS nominal voltage range with ±980 V peak capability covers 120/230/240 VAC systems, and its reinforced 5 kVRMS isolation eliminates the need for an external optocoupler or digital isolator. The integrated voltage divider and on-chip VRMS, IRMS, real/reactive/apparent power, and power-factor calculations allow a smart plug, smart circuit breaker, or PDU to compute billing-grade telemetry without burdening the host MCU.
おすすめ
Server / Telecom PSU Load Monitoring
In server and telecom PSUs, the ACS37800KMACTR-030B3-I2C monitors the AC input and the high-current DC output with bidirectional ±30 A capability. Its factory-trimmed gain and phase calibration support accurate efficiency calculations across load steps, and its I2C interface allows BMC or MCU polling at low bus rates. The reinforced isolation removes the need for separate current-transformer + AFE stages, reducing both BOM count and PCB area in 1U/2U form factors.
おすすめ
Solar Inverter DC/AC Monitoring
The ACS37800KMACTR-030B3-I2C enables per-string or per-phase monitoring in single-phase solar inverters and microinverters. Its ±30 A bidirectional current range handles string currents up to 30 A, and its voltage channel supports DC bus voltages up to ±980 V peak. On-chip zero-cross detection with time-based hysteresis synchronizes power-factor calculations to the AC line, and the reinforced isolation lets the inverter's low-voltage control section safely read high-side telemetry over I2C.
おすすめ
EV Charging Station Energy Metering
For AC Level 1/Level 2 EV charging stations, the ACS37800KMACTR-030B3-I2C provides billing-grade isolation and energy accumulation directly inside the charging cable assembly or wallbox. Its bidirectional current sensing supports regen/vehicle-to-grid modes in emerging V2G pilots, and its integrated energy counters allow the charge controller to meter kWh without a separate metering IC. The I2C variant is preferred where the host MCU sits on the same low-voltage side as the J1772 / IEC 61851 control pilot logic.
おすすめ
Industrial Motor Drive / Smart Breaker
In industrial motor drives and smart circuit breakers, the ACS37800KMACTR-030B3-I2C provides isolated current and voltage sensing that survives the high dv/dt of inverter switching. Its -40 C to +125 C operating range suits cabinet and outdoor enclosures, and the reinforced isolation simplifies creepage/clearance at the breaker bus bar. Integrated fault thresholds allow fast overcurrent detection without polling the host MCU, enabling sub-millisecond trip response.
おすすめ
Battery Management / Energy Storage Systems
In battery management and residential energy storage systems, the ACS37800KMACTR-030B3-I2C measures charge/discharge current on the DC bus with bidirectional ±30 A capability and computes state-of-charge-relevant energy directly. Reinforced isolation allows safe telemetry from the high-voltage battery stack to the BMS host MCU on the low-voltage side. Its 3.3 V supply and I2C interface integrate cleanly with typical BMS architectures based on PIC32MZ or STM32-class MCUs.
おすすめ
Smart Home Sub-Metering and IoT Energy Monitors
Wi-Fi/Bluetooth smart-plug and sub-meter designs benefit from the ACS37800KMACTR-030B3-I2C's integrated isolation and on-chip power calculations, which eliminate a separate metering MCU. With 480 VRMS rating and ±30 A current range it can be deployed at branch-circuit level in residential panels. Its low I2C bus rate requirement is well-matched to ESP32-class IoT MCUs that publish telemetry over Wi-Fi or Thread to a home energy dashboard.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ACS37800KMACTR-030B3-I2C — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ACS37800KMACTR-030B3-SPI | ACS37800KMCTR-030B3-I2C-A | ACS37800KMACTR-030B2-I2C |
|---|---|---|---|---|
| Brand | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems |
| Package | 16-SOIC (MA) | 16-SOIC (MA) - same | 16-SOIC (MC) - pin-compatible | 16-SOIC (MA) - same |
| Voltage Range | 480 VRMS / ±980 V peak | 480 VRMS / ±980 V peak | 480 VRMS / ±980 V peak | 480 VRMS / ±980 V peak |
| Digital Interface | I2C | SPI | I2C | I2C |
| Isolation Voltage | 5 kVRMS reinforced | 5 kVRMS reinforced | 5 kVRMS reinforced | 5 kVRMS reinforced |
| Automotive Grade | No | No | Yes (AEC-Q100 -A suffix) | No |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
主な差別化要因
- Single-package isolated power monitor （vs INA226 (TI))
- I2C variant with full SPI-family pinout compatibility （vs ACS37800KMACTR-030B3-SPI)
- Automotive-grade drop-in option （vs ACS37800KMCTR-030B3-I2C-A)
設計ノート
Estimated: Follow Allegro's MA package PCB layout guidelines strictly. Maintain minimum 8 mm creepage and clearance between the IP+/IP- primary conductor pads and any low-voltage trace on the secondary side to preserve the 5 kVRMS reinforced isolation rating. Place the VCC decoupling capacitor (0.1 uF per the datasheet performance characteristics) as close to pin 1 as possible, and add a bulk 1 uF to handle I2C bus glitches.
At continuous ±30 A DC, the ACS37800KMACTR-030B3-I2C dissipates measurable power in its internal conductor resistance. Use wide PCB copper pours on IP+/IP- (estimated: at least 200 sq mm each side on outer layers) to keep the leadframe temperature rise below 30 C. For continuous 30 A operation in enclosed enclosures, derate to 20-25 A or provide forced airflow per the datasheet thermal curves.
Do not route I2C traces near the primary conductor or under the IC body; high dv/dt on the AC mains can couple into SDA/SCL and corrupt I2C transactions even with reinforced isolation between power domains. Place a small RC filter on INT and RESETn if used in electrically noisy environments, and verify the address-select (ADDR) pin is tied to VCC or GND, not left floating, to avoid I2C address drift.
コンプライアンス情報
RoHS compliant per distributor listing. Not AEC-Q100 qualified - select ACS37800KMCTR-030B3-I2C-A suffix variant for automotive. Halogen-free status not explicitly confirmed in the provided web data.
