INA237Q-Q1 - 85V 16-bit I2C Power Monitor AEC-Q100 | TI
MPN: INA237Q-Q1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.04 | $2.04 |
| 10 | $1.87 | $18.70 |
| 100 | $1.63 | $163.00 |
| 500 | $1.42 | $710.00 |
| 1,000 | $1.21 | $1,210.00 |
Drop-in alternatives for INA237Q-Q1 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
INA237
β Drop-Inβ In Stock
$0.98 / Unit
View Datasheet βINA238-Q1
β Drop-Inπ Reference alternative (not in catalog)
INA239-Q1
β Drop-Inπ Reference alternative (not in catalog)
INA228-Q1
β Drop-Inπ Reference alternative (not in catalog)
INA226AIDGSR-Q1
β‘ Same Packageβ In Stock
$1.55 / Unit
View Datasheet βINA237Q-Q1 Maximum Ratings & Electrical Characteristics
| Function | Current/Voltage/Power/Charge 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 |
| Interface | I2C |
| Automotive Qualification | AEC-Q100 |
| Measured Parameters | Current, bus voltage, power, charge |
| Input Type | Resistive shunt sense element |
| Package | 10-VSSOP (DGS) |
| Mounting Type | Surface Mount |
| Brand | Texas Instruments |
| Operating Temperature | [DATA_NEEDED: operating temperature range] |
| Supply Voltage | [DATA_NEEDED: supply voltage range] |
| Quiescent Current | [DATA_NEEDED: quiescent current] |
| Addressable I2C Bus Count | [DATA_NEEDED: addressable I2C bus count] |
| RoHS Status | Compliant |
INA237Q-Q1 Pin Configuration
| Pin 1 | VIN+ β Shunt positive input |
| Pin 2 | VIN- β Shunt negative input |
| Pin 3 | GND β Ground reference |
| Pin 4 | VVS β Power supply input |
| Pin 5 | SDA β I2C data |
| Pin 6 | SCL β I2C clock |
| Pin 7 | A0 β Address select |
| Pin 8 | A1 β Address select |
| Pin 9 | VBUS β Bus voltage measurement input |
| Pin 10 | NC/GPIO β [DATA_NEEDED: pin 10 function - verify in datasheet] |
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
INA237Q-Q1 is suitable for 6 applications: Automotive 48-V Battery Monitoring, Onboard Charger and DC-DC Rail Telemetry, Solar and Energy Harvesting Charge Monitoring, Industrial 24-V Power Rail Supervision, Network and Server Power Budgeting, IoT and Smart Device Power Profiling.
Automotive 48-V Battery Monitoring
The INA237Q-Q1 fits 48-V mild-hybrid battery supervision because its -0.3 V to +85 V common-mode range directly tolerates transients above the nominal 48-V rail, and AEC-Q100 Grade qualification meets automotive quality requirements. Placed on the high side with an external shunt, it converts shunt voltage to calibrated current readings over I2C, letting the vehicle MCU track charge and discharge currents without analog offset drift. The 16-bit ADC gives sufficient resolution to detect milliamp-level leakage at idle while capturing hundred-amp peaks with appropriate shunt sizing.
Recommended
Onboard Charger and DC-DC Rail Telemetry
In OBC and auxiliary DC-DC converter power stages, the INA237Q-Q1 provides current and power telemetry on high-voltage-side rails up to 85 V common-mode, eliminating isolated analog sensing stages at moderate voltages. Its delta-sigma digitization is immune to the switching ripple typical around converters, and the digital I2C output integrates cleanly with system MCUs such as the TMS320F28003x family. Designers should place a low-pass RC filter on the shunt inputs and average multiple conversions to reduce reflection of switching-frequency noise.
Recommended
Solar and Energy Harvesting Charge Monitoring
For solar charge controllers, the INA237Q-Q1 monitors panel and battery currents with one device per rail thanks to the wide 85-V common-mode tolerance that covers typical 24-V and 48-V panel strings. The on-chip charge accumulation register supports coulomb counting for state-of-charge estimation without continuous host polling. Its I2C bus allows a single host controller to poll several monitors at different addresses across panel, battery, and load branches, simplifying telemetry aggregation in renewable energy systems.
Recommended
Industrial 24-V Power Rail Supervision
Industrial PLCs and motor-control cabinets use 24-V distribution rails whose current draw indicates load health and fault conditions. The INA237Q-Q1 measures these rails with high-side placement, reporting current, bus voltage, and computed power over I2C to the supervisory controller. The wide common-mode range covers surge events above the 24-V nominal rail, and its 16-bit resolution distinguishes incremental load changes for predictive-maintenance analytics. Because it is AEC-Q100 qualified, it exceeds the typical industrial reliability bar, providing margin in harsh factory-floor temperature environments.
Recommended
Network and Server Power Budgeting
Data-center line cards and telecom equipment operating from -48-V or 54-V distributed power benefit from the INA237Q-Q1's 85-V common-mode headroom for high-side power telemetry. Real-time current and power readings over I2C let the baseboard controller enforce power budgets, throttle loads, and detect failing fans or shorted cards. The digital interface avoids analog-to-digital conversion errors at the host, and configurable conversion times let designers trade update rate against noise for sub-watt power-budget accuracy across server racks.
Recommended
IoT and Smart Device Power Profiling
Battery-powered IoT gateways and smart meters use the INA237Q-Q1 to profile system current consumption in production test and in the field. With the +/-40.96 mV full-scale range and a larger shunt, the 16-bit ADC resolves sleep-mode microamp currents while still capturing transmit bursts. The I2C interface connects directly to low-power MCUs like the MSPM0L1305-Q1, and configurable averaging enables energy-usage dashboards. Its low complexity - no external amplifier or ADC required - shortens design cycles for connected device platforms requiring calibrated power telemetry.
Recommended
Recommended Products Summary
Engineering reference data for INA237Q-Q1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA237 | INA238-Q1 | INA239-Q1 | INA228-Q1 |
|---|---|---|---|---|---|
| Package | 10-VSSOP (DGS) | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| ADC Resolution | 16-bit | 16-bit | 16-bit | 16-bit | 20-bit |
| Common-Mode Voltage | -0.3 V to 85 V | -0.3 V to 85 V | -0.3 V to 85 V | -0.3 V to 85 V | -0.3 V to 85 V |
| AEC-Q100 Qualified | Yes | No | Yes | Yes | Yes |
| ALERT Function | No | No | Yes | Yes | Yes |
| Temperature Sensor | No | No | No | Yes | Yes |
| Interface | I2C | I2C | I2C | I2C | I2C |
| Price (1 pc, as of 2026-08-29) | ~$2.04 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- 85-V common-mode tolerance (vs INA226AIDGSR-Q1)
- AEC-Q100 automotive qualification (vs INA237)
- Lower cost than alert-equipped family members (vs INA238-Q1)
Design Notes
Use a Kelvin-connected shunt resistor: route the VIN+ and VIN- sense traces directly to the shunt pads, not to shared power traces. Any milliohm of trace resistance adds gain error. Keep the sense loop short and symmetric to reject common-mode transients in automotive 48-V environments. Per TI datasheet application section, place a differential RC filter (e.g., 10 ohm and 0.1 uF) at the shunt inputs for switching-noise immunity.
Size the shunt so maximum load current produces a differential voltage within the selected full-scale range: +/-163.84 mV for highest dynamic range or +/-40.96 mV to reduce shunt power loss. For a 100-A peak on a 48-V rail, a 1 mohm shunt gives 100 mV swing but dissipates 10 W at peak - consider a 0.5 mohm shunt with the +/-163.84 mV range. Shunt tolerance directly scales current accuracy; use 1% or 0.5% shunts for calibrated systems.
Do not exceed 85 V on VBUS or the shunt common-mode; automotive load-dump transients can exceed this - add series impedance or TVS protection on VBUS. Also note that firmware written for the commercial INA237 is generally portable, but if migrating between INA237/238/239/228 family members, register map differences (alert and temperature registers) must be reconciled before production.
Compliance Information
AEC-Q100 qualified per TI product page. RoHS compliance per standard TI automotive product offering; REACH and halogen-free status not stated in provided data.
