INA237 - 85V, 16-Bit I2C Power Monitor | Texas Instruments
MPN: INA237 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.82 | $1,820.00 |
Drop-in alternatives for INA237 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
INA238AIDGSR
✅ Drop-In📋 Reference alternative (not in catalog)
INA228AIDGSR
✅ Drop-In📋 Reference alternative (not in catalog)
INA239AIDGSR
✅ Drop-In📋 Reference alternative (not in catalog)
INA226AIDGSR
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →INA219AIDR
✅ Drop-In✓ In Stock
$0.4136 / Unit
View Datasheet →INA237 Maximum Ratings & Electrical Characteristics
| Common-Mode Voltage Range | -0.3 V to 85 V |
| Full-Scale Differential Input | ±163.84 mV or ±40.96 mV |
| ADC Resolution | 16-bit delta-sigma |
| Offset Voltage | ±50 µV (maximum) |
| Offset Drift | ±0.02 µV/°C (maximum) |
| Gain Error | ±0.3% |
| Supply Voltage | 2.7 V to 5.5 V |
| Quiescent Current | 310 µA (typical) |
| Interface | I2C with 16 programmable addresses |
| Alert Pin | Yes (overcurrent/overvoltage) |
| Package | 10-pin VSSOP (DGS) |
| Operating Temperature | -40°C to +125°C |
| Automotive Grade | INA237-Q1 AEC-Q100 qualified |
| RoHS Status | Compliant |
| Mounting Type | Surface Mount |
INA237 Pin Configuration
| Pin 1 | VS — Power supply input (2.7V to 5.5V) |
| Pin 2 | GND — Ground |
| Pin 3 | SDA — I2C data line |
| Pin 4 | SCL — I2C clock line |
| Pin 5 | ALERT — Alert output (open-drain) |
| Pin 6 | A0 — Address pin 0 |
| Pin 7 | A1 — Address pin 1 |
| Pin 8 | IN- — Negative shunt input |
| Pin 9 | IN+ — Positive shunt input |
| Pin 10 | NC — No connect |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
INA237 is suitable for 6 applications: Server and Telecom Power Monitoring, Battery Management Systems, Industrial Automation, Test and Measurement Equipment, Data Center Power Management, Automotive Battery Monitoring.
Server and Telecom Power Monitoring
The INA237's 85-V common-mode range and 16-bit ADC make it ideal for monitoring 48-V telecom and server power rails. It accurately measures current, voltage, and power, enabling real-time energy management and fault detection. Its I2C interface allows easy integration with baseboard management controllers (BMCs) for telemetry and alerting. The low offset voltage (±50 µV) ensures precise measurements even at low shunt voltages, critical for detecting small load changes in high-availability systems.
Recommended
Battery Management Systems
In battery management systems (BMS), the INA237 monitors charge/discharge currents and cell voltages with high accuracy. Its wide common-mode range supports stack voltages up to 85 V, and the 16-bit ADC provides fine resolution for coulomb counting. The alert pin can trigger on overcurrent conditions, protecting the battery pack. The low quiescent current (310 µA) is beneficial for extending battery life in portable applications.
Recommended
Industrial Automation
The INA237 is well-suited for industrial automation, where it monitors motor drives, PLC power supplies, and robotic systems. Its 85-V common-mode range accommodates 24-V and 48-V industrial buses, and the I2C interface simplifies data collection in distributed control systems. The device's accuracy (±0.3% gain error) ensures reliable power measurement for predictive maintenance and energy optimization. The -40°C to +125°C operating range makes it robust for factory floor environments.
Recommended
Test and Measurement Equipment
The INA237's high precision and wide dynamic range make it ideal for test and measurement instruments, such as programmable power supplies and electronic loads. It can measure currents from milliamps to amps with 16-bit resolution, enabling accurate characterization of devices under test. The programmable conversion time and averaging filter allow engineers to trade off speed and noise, adapting to different measurement scenarios. Its small VSSOP package saves board space in compact instruments.
Recommended
Data Center Power Management
In data centers, the INA237 monitors power consumption of servers, switches, and storage systems to optimize energy efficiency. Its 85-V common-mode range supports high-voltage distribution, and the 16-bit ADC provides accurate power telemetry for capacity planning and cost allocation. The I2C interface with 16 addresses allows multiple INA237s to monitor many rails on a single bus. The alert pin can signal thermal or overcurrent events, enabling proactive management.
Recommended
Automotive Battery Monitoring
The INA237-Q1 variant is AEC-Q100 qualified for automotive applications, making it suitable for monitoring 12-V and 48-V battery systems in electric and hybrid vehicles. It measures current, voltage, and power with high accuracy, supporting state-of-charge estimation and fault detection. The wide common-mode range and robust temperature rating (-40°C to +125°C) ensure reliable operation under harsh automotive conditions. The I2C interface allows integration with vehicle ECUs.
Recommended
Recommended Products Summary
Engineering reference data for INA237 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA238AIDGSR | INA228AIDGSR | INA239AIDGSR | INA226AIDGSR | INA219AIDR |
|---|---|---|---|---|---|---|
| Package | 10-pin VSSOP (DGS) | 10-pin VSSOP (DGS) | 10-pin VSSOP (DGS) | 10-pin VSSOP (DGS) | 10-pin VSSOP (DGS) | 10-pin VSSOP (DGS) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| ADC Resolution | 16-bit | 16-bit | 20-bit | 16-bit | 16-bit | 12-bit |
| Common-Mode Voltage | 85 V | 85 V | 85 V | 85 V | 36 V | 26 V |
| Interface | I2C | I2C | I2C | SPI | I2C | I2C |
| Offset Voltage | ±50 µV | ±25 µV | ±25 µV | ±50 µV | ±10 µV | ±50 µV |
| Gain Error | ±0.3% | ±0.1% | ±0.1% | ±0.3% | ±0.1% | ±0.5% |
| Quiescent Current | 310 µA | 310 µA | 310 µA | 310 µA | 330 µA | 1 mA |
Key Differentiators
- Wide common-mode voltage range of 85 V (vs INA226AIDGSR)
- 16-bit ADC with low offset voltage (vs INA219AIDR)
- I2C interface with 16 addresses (vs INA239AIDGSR)
Design Notes
Use Kelvin connections to the shunt resistor to minimize parasitic resistance and ensure accurate voltage sensing. Place the shunt close to the INA237 input pins and route the sense traces as a differential pair with equal length. Avoid routing high-current paths near the sense lines to prevent noise coupling.
Decouple the VS pin with a 0.1 µF ceramic capacitor placed as close as possible to the pin, and optionally a 1 µF capacitor for lower-frequency noise. The INA237 operates from 2.7 V to 5.5 V, so ensure the supply is stable and within this range. For noisy environments, add a ferrite bead in series with VS.
Route I2C lines (SDA, SCL) with appropriate pull-up resistors (typically 4.7 kΩ to 10 kΩ) to the supply voltage. Keep the traces short and shielded from high-voltage or high-current traces to avoid interference. If using multiple INA237s, assign unique addresses via A0 and A1 pins to avoid bus conflicts.
Compliance Information
INA237-Q1 variant is AEC-Q100 qualified. RoHS compliant per TI product page.
