INA237AIDGSR - 85V 16-Bit I2C Power Monitor VSSOP-10 | TI
部品番号: INA237AIDGSR ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.45 | $24.50 |
| 100 | $1.92 | $192.00 |
| 500 | $1.55 | $775.00 |
| 1,000 | $1.3 | $1,300.00 |
| 2,500 | $1.11 | $2,775.00 |
INA237AIDGSR 概要
A digital power monitor is an IC that measures current, voltage, and power by sensing the voltage drop across an external shunt resistor. It sits within the power-management IC hierarchy as a member of the current-sense amplifier family, adding a high-resolution ADC and digital interface so a host controller can read system energy usage directly. This category is essential for energy-efficient designs, load protection, predictive maintenance, and closed-loop power control in industrial, telecom, server, and automotive systems.
Key specifications of the INA237AIDGSR include 16-bit ADC resolution, programmable conversion time, 16 user-selectable I2C addresses, an open-drain ALERT pin for threshold-based interrupts, ±50 µV maximum offset voltage, ±0.02 µV/°C offset drift, ±0.3 % gain error, and support for both high-side and low-side current-sensing topologies. Shunt full-scale ranges are pin-selectable between ±163.84 mV and ±40.96 mV, allowing the designer to trade dynamic range for resolution depending on shunt resistor choice.
The architecture is built around a chopper-stabilized delta-sigma modulator followed by a digital filter, which converts the differential shunt voltage into a clean 16-bit code. The same device simultaneously measures the bus voltage using an internal resistor divider, eliminating the need for an external ADC channel. The I2C interface supports standard (100 kHz), fast (400 kHz), and fast-plus (1 MHz) modes, and the part integrates a robust alert/wake-up scheme that is well suited to battery-powered and always-on monitoring.
Typical applications include 48 V data-center and telecom power-rail monitoring, battery management and pack telemetry, industrial 24 V bus current sensing, motor-drive and inverter DC-link monitoring, and bench test equipment. The 85 V common-mode range covers 48 V nominal rails with significant transient margin, making the INA237AIDGSR a versatile choice across high-voltage and low-voltage systems.
When designing with this device, route the differential shunt traces as a Kelvin connection directly to the sense resistor pads, place a 0.1 µF decoupling capacitor close to the VDD pin, and choose 4.7 kΩ I2C pull-ups to balance rise time against bus capacitance. For AEC-Q100 requirements, select the INA237-Q1 variant.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that are not collected in any single manufacturer document.
ドロップイン代替品: INA237AIDGSR — 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: INA237AIDGSR （同一形状・フットプリント） — 相違点: ADC Resolution, Function.
クイック比較ツール — 並列比較する代替部品を選択:
INA238AIDGSR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
INA228AIDGSR
✅ ドロップイン✓ 在庫あり
$2.52 / 個
データシートを見る →INA239AIDGSR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
INA237AIDR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
INA237AIDGSR 仕様
| 機能 | Digital current/voltage/power monitor with I2C interface and alert |
| トポロジー | High-side or low-side current sensing |
| ADC Resolution | 16-bit delta-sigma |
| Differential Shunt Full-Scale Range | ±163.84 mV or ±40.96 mV (selectable) |
| Common-Mode Input Voltage Range | −0.3 V to +85 V |
| Bus Voltage Measurement Range | 0 V to 85 V (internal divider) |
| Supply Voltage (VDD) | 2.7 V to 5.5 V |
| Quiescent Current (typical) | 310 µA |
| Maximum Offset Voltage | ±50 µV |
| Offset Drift | ±0.02 µV/°C |
| Gain Error | ±0.3 % |
| インターフェース | I2C (standard 100 kHz, fast 400 kHz, fast-plus 1 MHz) |
| Number of I2C Addresses | 16 programmable |
| Alert Output | Open-drain ALERT pin |
| 動作温度範囲 | −40 °C to +125 °C |
| パッケージ | 10-pin VSSOP (DGS) |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant |
| Automotive Grade (Q1 variant) | INA237AIDGSR not qualified; INA237-Q1 is AEC-Q100 |
INA237AIDGSR ピン構成
| ピン 1 | IN+ — Differential shunt positive input |
| ピン 2 | IN− — Differential shunt negative input |
| ピン 3 | GND — Ground |
| ピン 4 | VDD — Supply voltage (2.7 V to 5.5 V); decouple with 0.1 µF to GND |
| ピン 5 | SDA — I2C data (open-drain; pull up to VDD with 4.7 kΩ typical) |
| ピン 6 | SCL — I2C clock (open-drain; pull up to VDD with 4.7 kΩ typical) |
| ピン 7 | ALERT — Open-drain alert output for threshold-based interrupts |
| ピン 8 | A0 — I2C address-select bit 0 (logic level) |
| ピン 9 | A1 — I2C address-select bit 1 (logic level) |
| ピン 10 | NC — Not connected (per datasheet) |
主な用途
INA237AIDGSR の用途: 6 件s: 48 V Data-Center Power-Rail Monitoring, Battery Management System Telemetry, Industrial 24 V Bus Current Sensing, Solar Inverter DC-Link Monitoring, Server and Telecom PSU Hot-Side Monitoring, Bench Test and Measurement Equipment.
48 V Data-Center Power-Rail Monitoring
The INA237AIDGSR is well suited to 48 V data-center and telecom power-rail monitoring because of its −0.3 V to +85 V common-mode input range, which covers the 48 V nominal rail with substantial transient margin during hot-swap events. With ±50 µV maximum offset and ±0.3 % gain error, the device delivers accurate current, voltage, and power telemetry needed for server power budgeting and efficiency reporting. Placed in series with a 1 mΩ shunt on the high side, the INA237AIDGSR streams 16-bit I2C data to a BMC for real-time load tracking; the ALERT pin can flag overcurrent events before a fuse blows. Pair with a TI TPS7A4701 LDO and an MSP430 host controller for a complete monitoring subsystem.
おすすめ
Battery Management System Telemetry
In a battery management system, the INA237AIDGSR provides per-cell or per-pack current and voltage telemetry that supports state-of-charge and state-of-health algorithms. The 85 V common-mode range supports 12 V, 24 V, 36 V, and 48 V battery stacks, while the 16-bit ADC resolves milliamp-level currents through a low-value shunt. The I2C interface simplifies galvanic-isolated data retrieval when paired with a digital isolator, and the ALERT pin enables fast overcurrent or undervoltage interrupts to the BMS host. Place the INA237AIDGSR between the pack negative terminal and the load return, and use Kelvin traces to the shunt for best accuracy.
おすすめ
Industrial 24 V Bus Current Sensing
The INA237AIDGSR excels at monitoring 24 V industrial buses used in factory automation, motor drives, and PLC I/O. The 85 V common-mode range easily accommodates 24 V nominal plus inductive transients up to several hundred volts during switching events. High-side or low-side sensing topologies are both supported, so the INA237AIDGSR can be placed on either side of the load depending on ground-referencing preferences. With 16 programmable I2C addresses, multiple rails can be monitored on a single I2C bus, simplifying wiring in distributed control cabinets. The 310 µA quiescent current is negligible compared to the monitored load, preserving system efficiency.
おすすめ
Solar Inverter DC-Link Monitoring
Solar inverters require accurate DC-link current sensing for maximum power point tracking and fault detection. The INA237AIDGSR offers the wide common-mode range needed to sense currents in strings operating at 40 V to 80 V, with 16-bit resolution to detect small MPPT perturbations. The I2C interface allows the inverter controller to read bus voltage, current, and calculated power directly without an external ADC channel. Using a low-inductance shunt, the INA237AIDGSR enables precise string-level monitoring that improves energy harvest. The automotive-grade INA237-Q1 variant is recommended for solar installations in vehicles.
おすすめ
Server and Telecom PSU Hot-Side Monitoring
The INA237AIDGSR is ideal for hot-side current monitoring in server and telecom power supplies where the high-side rail is 12 V, 24 V, or 48 V. By placing the shunt on the high side, ground-referenced measurements simplify PCB layout and avoid ground-loop errors that plague low-side sensing. The 85 V common-mode range covers hot-swap transients and capacitor inrush events without saturating the ADC. Combined with an ALERT pin threshold for overcurrent protection, the INA237AIDGSR enables predictive maintenance by reporting gradual drift in PSU efficiency to the host controller.
おすすめ
Bench Test and Measurement Equipment
In laboratory power supplies, electronic loads, and bench DMMs, the INA237AIDGSR delivers 16-bit current and voltage readback that rivals dedicated instruments. Its ±50 µV offset and ±0.3 % gain error allow accurate measurement of low currents through small shunts, while the I2C interface integrates cleanly with a microcontroller front panel. The ALERT pin can trigger programmable shutdown thresholds, replicating instrument-class protection features. Designers can use the INA237AIDGSR alongside precision references like the REF3030AIDBZR for self-calibration routines that maintain long-term accuracy.
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: INA237AIDGSR — 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 | INA238AIDGSR | INA228AIDGSR | INA239AIDGSR |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | VSSOP-10 (DGS) | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same |
| ADC Resolution | 16-bit | 16-bit | 20-bit | 16-bit |
| Common-Mode Input Range | −0.3 V to +85 V | −0.3 V to +85 V | −0.3 V to +85 V | −0.3 V to +85 V (extended transient) |
| Shunt Full-Scale Range | ±163.84 mV / ±40.96 mV | ±163.84 mV / ±40.96 mV | ±163.84 mV / ±40.96 mV | ±163.84 mV / ±40.96 mV |
| Maximum Offset Voltage | ±50 µV | Improved (lower than INA237) | Improved (lower than INA237) | ±50 µV |
| Energy/Charge Accumulator | No | No | Yes | No |
| Interface | I2C | I2C | I2C | I2C |
| Approx. Unit Price (1 pc, as of 2026-10-08) | $2.85 | Higher (improved accuracy) | Highest (20-bit + accumulators) | Comparable |
主な差別化要因
- Pin-compatible 16-bit upgrade path （vs INA238AIDGSR)
- 20-bit resolution drop-in （vs INA228AIDGSR)
- Wide 85 V common-mode range （vs INA239AIDGSR)
設計ノート
Use a Kelvin (4-wire) connection from the differential shunt resistor pads directly to the IN+ and IN− pins. Route the sense traces as a differential pair with ground guarding to minimize common-mode noise pickup. The 85 V common-mode range tolerates high dV/dt environments, but trace impedance balance improves accuracy at high bandwidth. Avoid vias in the sense path whenever possible.
Place a 0.1 µF ceramic decoupling capacitor within 2 mm of the VDD pin to GND. For noisy supplies, add a 10 µF bulk capacitor in parallel. The VDD rail should be a low-noise source (LDO recommended) since supply noise couples directly into the ADC reference. Estimated: at 310 µA quiescent current, a 10 µF VDD cap provides ~32 ms of hold-up against VDD droops.
Do not exceed the −0.3 V to +85 V common-mode range on IN+/IN−, even transiently. The I2C pull-up resistors must connect to VDD, not to a separate rail; mismatched pull-up voltage can violate the SDA/SCL VIH spec. The ALERT pin is open-drain and requires its own pull-up. For systems with multiple INA237 parts, set A0/A1 to unique combinations so each responds to a different I2C address (16 options available).
コンプライアンス情報
The INA237AIDGSR is not AEC-Q100 qualified; choose INA237-Q1 for automotive applications. RoHS and REACH compliant per TI product page.
