INA237 - 85V 16-Bit I2C Power Monitor | Texas Instruments
MPN: INA237 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.95 | $1.95 |
| 10 | $1.72 | $17.20 |
| 100 | $1.42 | $142.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $0.98 | $980.00 |
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:
INA238
✅ Drop-In📋 Reference alternative (not in catalog)
INA239
✅ Drop-In📋 Reference alternative (not in catalog)
INA228
✅ Drop-In📋 Reference alternative (not in catalog)
INA237-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
INA223
⚡ Same Package✓ In Stock
$1.82 / Unit
View Datasheet →INA237 Maximum Ratings & Electrical Characteristics
| Function | Current/Voltage/Power monitor |
| ADC Resolution | 16-bit delta-sigma |
| Common-Mode Voltage Range | -0.3 V to 85 V |
| Full-Scale Differential Input | ±163.84 mV or ±40.96 mV |
| Offset Voltage | ±50 uV (maximum) |
| Offset Drift | ±0.02 uV/degC (maximum) |
| Gain Error | ±0.3% |
| Supply Voltage | 2.7 V to 5.5 V |
| Quiescent Current | 310 uA (typical) |
| Interface | I2C, 16 programmable addresses |
| Alert Pin | Yes (overcurrent/overvoltage) |
| Sensing Topology | High-side and low-side |
| Operating Temperature | -40degC to +125degC |
| Package | 10-pin VSSOP (DGS) |
| Mounting Type | Surface Mount |
| Automotive Grade Option | INA237-Q1 (AEC-Q100 qualified) |
INA237 Pin Configuration
| Pin 1 | A0 — I2C address select |
| Pin 2 | A1 — I2C address select |
| Pin 3 | SCL — I2C clock |
| Pin 4 | SDA — I2C data |
| Pin 5 | GND — Ground |
| Pin 6 | ALERT — Alert output (open-drain) |
| Pin 7 | VBUS — Bus voltage sense input |
| Pin 8 | VS — Power supply, 2.7 V to 5.5 V |
| Pin 9 | IN- — Shunt negative sense input |
| Pin 10 | IN+ — Shunt positive sense input |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. 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 Data Center Power Monitoring, Telecom -48V Systems, Battery Management Systems, Industrial Automation and Motor Drives, Test and Measurement Equipment, Automotive 48V Systems.
Server and Data Center Power Monitoring
The INA237 fits server PSU and rack power telemetry because its 85 V common-mode ceiling covers 48 V server bus rails with margin, while its ±50 uV offset supports shunt values chosen for sub-1% full-load accuracy. Placed in the high-side path with an I2C link to the baseboard controller, it streams bus voltage, current, and computed power for thermal and efficiency management. Averaging filters trade update rate for noise, typically delivering stable readings within milliseconds.
Recommended
Telecom -48V Systems
In telecom rectifiers and distribution boards, the INA237's common-mode range extending down to -0.3 V and up to 85 V directly covers -48 V battery plants. The device senses current in the high-side feed with a milliohm shunt; its 16-bit ADC resolves milliamp-level leakage while the alert pin flags overcurrent conditions without CPU polling. The 310 uA quiescent current keeps standby draw negligible in always-on infrastructure.
Recommended
Battery Management Systems
For battery packs and BMS slave boards, the INA237 provides coulomb-free current telemetry via its 16-bit delta-sigma ADC across a shunt, with ±0.3% gain error supporting accurate state-of-charge estimates when combined with host integration. The 85 V common-mode range suits 48 V and higher-voltage strings, and the I2C interface with 16 addresses lets one controller monitor several series sections. Conversion-time programming balances sampling rate against noise for reliable charge accounting.
Recommended
Industrial Automation and Motor Drives
In PLC I/O and drive control panels, the INA237 monitors 24 V and 48 V actuator rails in high-side configuration, detecting stalled-motor overloads through the programmable alert threshold. Its -40degC to +125degC rating and ±0.02 uV/degC offset drift maintain accuracy on factory floors with wide thermal swings. Digital I2C output eliminates precision analog routing across backplanes, improving noise immunity versus analog current-sense amplifiers.
Recommended
Test and Measurement Equipment
Bench power supplies, USB power analyzers, and probe accessories benefit from the INA237's 16-bit resolution and programmable gain across ±163.84 mV and ±40.96 mV ranges, letting one design cover both high-current and low-current measurement profiles. Adafruit and SparkFun offer INA237 breakout boards (e.g., Adafruit 6340) for rapid prototyping with Qwiic. Fast conversion modes capture load transients while averaging modes give low-noise steady-state readings.
Recommended
Automotive 48V Systems
For 48 V mild-hybrid zonal loads and onboard chargers, the AEC-Q100 qualified INA237-Q1 variant delivers the same 85 V, 16-bit monitoring in harsh under-hood and chassis environments. The alert pin supports fast overcurrent flagging to the vehicle MCU, and the I2C interface integrates with existing body-controller buses. Wide -40degC to +125degC operation and low offset drift preserve accuracy across automotive temperature extremes.
Recommended
Recommended Products Summary
Engineering reference data for INA237 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA238 | INA239 | INA228 | INA237-Q1 |
|---|---|---|---|---|---|
| Package | VSSOP-10 (DGS) | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| ADC Resolution | 16-bit | 16-bit | 16-bit | 20-bit | 16-bit |
| Common-Mode Voltage | -0.3 V to 85 V | -0.3 V to 85 V | [DATA_NEEDED] | -0.3 V to 85 V | -0.3 V to 85 V |
| Offset Voltage (max) | ±50 uV | lower than INA237 (better spec) | [DATA_NEEDED] | ±10 uV | ±50 uV |
| Energy/Charge Accumulation | No | No | [DATA_NEEDED] | Yes | No |
| Automotive Grade | No | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | Yes (AEC-Q100) |
| Interface | I2C | I2C (same register map) | I2C | I2C | I2C |
Key Differentiators
- Lowest cost 85 V monitor with 16-bit performance (vs INA228)
- Better accuracy option exists as pin-drop upgrade (vs INA238)
- Automotive qualification path (vs INA237-Q1)
Design Notes
Use Kelvin connections directly at the shunt resistor terminals for the IN+ and IN- traces. Any parasitic resistance in series with the sense lines adds directly to the measured shunt voltage and degrades the ±50 uV offset advantage. Keep the sense traces symmetric and route them away from switching nodes.
Place a 0.1 uF ceramic decoupling capacitor close to the VS pin (2.7 V to 5.5 V). The device draws only 310 uA typical, but I2C pull-ups and the alert output require a stable supply. The measured common-mode rail (up to 85 V) is independent of VS, so a 3.3 V logic supply can monitor high-voltage buses directly.
Do not exceed the ±163.84 mV full-scale differential input at the highest gain setting, or measurements will clip. Select the shunt so maximum load current produces a differential voltage within range while preserving resolution - for example, a 2 mOhm shunt gives 164 mV at 82 A, right at full scale. Also configure I2C pull-up values (typically 2.2k to 10k) for the bus speed used.
Compliance Information
RoHS compliant and lead-free per TI product page. AEC-Q100 applies only to the INA237-Q1 variant. REACH and halogen-free status [DATA_NEEDED: from TI quality page].
