INA333 Instrumentation Amplifier

@@ -0,0 +1,54 @@+# INA333++**Texas Instruments** · Instrumentation Amplifier · MSOP-8++The INA333 is a micropower, zero-drift instrumentation amplifier. A single external resistor sets gain from 1 to 1000, and the zero-drift topology gives low offset and drift for precision measurement of bridge sensors, thermocouples, and biopotential signals like ECG.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | RG | passive | Gain-setting pin. Place an external gain resistor RG between pins 1 and 8 to set gain G = 1 + (100 kΩ / RG). Leave open for unity gain (G = 1). |+| 2 | VIN- | input | Negative (inverting) analog input. Input voltage range is (V-) + 0.1 V to (V+) - 0.1 V; input bias current is ±70 pA typ (±200 pA max). |+| 3 | VIN+ | input | Positive (non-inverting) analog input. Input voltage range is (V-) + 0.1 V to (V+) - 0.1 V; input bias current is ±70 pA typ (±200 pA max). |+| 4 | V- | power_in | Negative power supply. Single-supply range +1.8 V to +5.5 V (with V- = GND) or dual-supply ±0.9 V to ±2.75 V. Absolute maximum supply span (V+) - (V-) = 7 V. |+| 5 | REF | input | Reference input. Sets the output zero (offset) voltage. Must be driven from a low-impedance source or connected to ground; internal RIN ≈ 300 kΩ, so a driving impedance error will degrade CMRR and gain accuracy. |+| 6 | VOUT | output | Amplifier output. Rail-to-rail output swings to within 50 mV of the supply rails with RL = 10 kΩ; short-circuit current is limited to -40/+5 mA. |+| 7 | V+ | power_in | Positive power supply. Single-supply range +1.8 V to +5.5 V or dual-supply ±0.9 V to ±2.75 V. Quiescent current is 50 µA typ (75 µA max). |+| 8 | RG | passive | Gain-setting pin (paired with pin 1). Place an external gain resistor RG between pins 1 and 8 to set gain G = 1 + (100 kΩ / RG). Leave open for unity gain. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Instrumentation amplifier (3-op-amp, zero-drift) |+| Gain | 1 to 1000 (single external resistor) |+| Input offset voltage | 25 uV typ, 75 uV max |+| Offset drift | 0.1 uV/C typ |+| Supply voltage | 1.8 V to 5.5 V |+| Supply current | 50 uA typ |+| CMRR | 100 dB min (G >= 10) |+| Operating temperature | -40 C to 85 C |++## Ordering variants++- `INA333IDGKR`+- `INA333IDGKT`+- `INA333IDRGR`+- `INA333IDRGT`++## CAD (KiCad official)++- Symbol: `ina333.kicad_sym`+- Footprint: `ina333.kicad_mod`+- 3D model: MSOP-8 body from KiCad `Package_SO/MSOP-8_3x3mm_P0.65mm`.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/ina333.pdf) (35 pp, sha256 `446404e162fbb07e`, 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/ina333-datasheet.pdf)

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