Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Gain | 50 V/V fixed (A2) |
| Common Mode | −0.2 V to +40 V |
| Supply | 1.7 V to 5.5 V |
| Input Bias | 0.5 nA typical; 3 nA under stated condition |
| Offset / CMRR | ±50 µV max; 120 dB minimum CMRR |
| Bandwidth | 37 kHz for A2 |
| Power / Control | 48 µA typical quiescent current; ENABLE in DDF package |
| Exact Package / Packing | SOT-23-THIN (DDF), 8 pins; 3000-piece large tape and reel |
Product Overview
INA186A2IDDFR is a low-power zero-drift current-sense amplifier intended for wide dynamic range, including low-current measurement where input bias would otherwise become a significant error. The A2 option provides 50 V/V fixed gain across a −0.2 V to 40 V common-mode range.
Its 0.5 nA typical input bias permits larger shunt resistors in microamp-range measurements without the tens-of-microamp bias error associated with many high-side monitors. The zero-drift architecture also holds offset to ±50 µV maximum, but bandwidth is intentionally modest at 37 kHz for A2.
The 8-pin DDF order code exposes both REF for bidirectional measurement and ENABLE for power management. Those pins are part of the exact-package selection value and are not available in every INA186 package implementation.
For related devices, see HKEQGOO’s Current Sense Amplifiers category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | INA186A2IDDFR |
| Gain | 50 V/V fixed (A2) |
| Common Mode | −0.2 V to +40 V |
| Supply | 1.7 V to 5.5 V |
| Input Bias | 0.5 nA typical; 3 nA under stated condition |
| Offset / CMRR | ±50 µV max; 120 dB minimum CMRR |
| Bandwidth | 37 kHz for A2 |
| Power / Control | 48 µA typical quiescent current; ENABLE in DDF package |
| Exact Package / Packing | SOT-23-THIN (DDF), 8 pins; 3000-piece large tape and reel |
| Manufacturer Status | Active / Production |
| Part Marking | 1ZMW |
Functional Highlights
Low input bias extends useful current range downward
When load current is very small, input bias current through source/shunt resistance can dominate the measurement. Sub-nanoamp typical bias makes INA186 better suited to high-value shunts and low-current monitoring.
Enable and 48 µA typical current support duty-cycled monitoring
The DDF package can be disabled when measurement is not required. Wake/settling behavior should still be included in firmware timing if readings are taken shortly after enabling.
Design Considerations
- Use the DDF ENABLE pin logic levels from the datasheet rather than assuming generic CMOS thresholds.
- For bidirectional sensing, drive REF from a stable low-impedance node and check output swing around it.
- Accept the 37 kHz A2 bandwidth as part of the zero-drift/low-power tradeoff.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists INA186A2IDDFR as Active / Production; SOT-23-THIN (DDF), 8 pins; 3000-piece large tape and reel; Level-1-260C-UNLIM; −40°C to +125°C; marking 1ZMW.
Related Engineering Resources
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