INA253

@@ -0,0 +1,65 @@+# INA253++**Texas Instruments** · Current-sense amplifier · TSSOP-20++Current-sense amplifier that integrates its own precision 2 mOhm shunt on-chip, so a designer drops in one part instead of matching an external resistor to the amplifier and fighting layout parasitics. The inputs handle a common-mode range from -4 to 80 V for high-side use, it carries up to 15 A continuous, and a REF pin sets the zero-current output for bidirectional current. The matched shunt gives a tight, temperature-stable gain error. A complete, board-friendly current measurement in one package.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | IS- | passive | Load-side terminal of the integrated 2-mΩ shunt resistor. Connect to load. Pins 1, 2, and 3 are internally tied together as one side of the shunt. |+| 2 | IS- | passive | Load-side terminal of the integrated 2-mΩ shunt resistor. Connect to load. |+| 3 | IS- | passive | Load-side terminal of the integrated 2-mΩ shunt resistor. Connect to load. |+| 4 | SH- | output | Kelvin sense output from the load-side of the internal shunt resistor. Connect to IN- directly if no filtering is needed. |+| 5 | IN- | input | Amplifier differential input from the load side of the shunt resistor. Common-mode range -4 V to +80 V. |+| 6 | GND | power_in | Device ground reference. |+| 7 | DNC1 | unconnected | Do Not Connect. Leave floating; do not tie to any potential. |+| 8 | NC | unconnected | No connect. |+| 9 | VS | power_in | Power supply input, 2.7 V to 5.5 V. Draws up to 2.4 mA quiescent current. |+| 10 | REF2 | input | Reference voltage 2 input, 0 V to VS. Sets the output reference along with REF1 for bidirectional current sensing. |+| 11 | REF1 | input | Reference voltage 1 input, 0 V to VS. Sets the output reference along with REF2 for bidirectional current sensing. |+| 12 | NC | unconnected | No connect. |+| 13 | OUT | output | Analog output voltage proportional to sensed current times the gain (100/200/400 mV/A depending on A1/A2/A3 variant). |+| 14 | DNC2 | unconnected | Do Not Connect. Leave floating; do not tie to any potential. |+| 15 | NC | passive | Reserved; connect this pin to GND. |+| 16 | IN+ | input | Amplifier differential input from the supply side of the shunt resistor. Common-mode range -4 V to +80 V. |+| 17 | SH+ | output | Kelvin sense output from the supply-side of the internal shunt resistor. Connect to IN+ directly if no filtering is needed. |+| 18 | IS+ | passive | Supply-side terminal of the integrated 2-mΩ shunt resistor. Connect to supply. Pins 18, 19, and 20 are internally tied together as one side of the shunt. |+| 19 | IS+ | passive | Supply-side terminal of the integrated 2-mΩ shunt resistor. Connect to supply. |+| 20 | IS+ | passive | Supply-side terminal of the integrated 2-mΩ shunt resistor. Connect to supply. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Current-sense amplifier with integrated shunt |+| Shunt | 2 mOhm integrated |+| Common-mode range | -4 V to 80 V |+| Continuous current | 15 A |+| Direction | Bidirectional (via REF) |+| Gain | Fixed (part option) |+| Supply | 2.7-5.5 V |+| Package | TSSOP-20 |++## Ordering variants++- `INA253A2PW (gain 2 V/A)`+- `INA253A3PW (gain 4 V/A)`+- `INA253A4PW (gain 8 V/A)`++## CAD (KiCad official)++- Symbol: `Amplifier_Current:INA253 (KiCad official)`+- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`+- 3D model: TSSOP-20 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/ina253.pdf) (36 pp, sha256 `f316d2de54cc0924`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/ina253-datasheet.pdf)

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