# INA303A3QPWRQ1

**Texas Instruments** · Current Sense Amplifiers · TSSOP-14

INA303A3QPWRQ1 from Texas Instruments, in a TSSOP-14. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VS | power_in | Analog power supply with a recommended operating range of 2.7 V to 5.5 V (5 V nominal), and an absolute maximum of 6 V. |
| 2 | OUT | output | Analog output that carries the output voltage; absolute limits are GND - 0.3 V to (VS) + 0.3 V. |
| 3 | LIMIT1 | input | Analog threshold limit input for ALERT1, set with external resistors as described in the Setting Alert Thresholds section; absolute limits are GND - 0.3 V to (VS) + 0.3 V. |
| 4 | REF | input | Analog reference voltage input that must be between 0 V and VS; absolute limits are GND - 0.3 V to (VS) + 0.3 V. |
| 5 | GND | power_in | Analog ground reference for the device. |
| 6 | LATCH1 | input | Digital input selecting transparent or latch mode for ALERT1; absolute limits are GND - 0.3 V to (VS) + 0.3 V. |
| 7 | LATCH2 | input | Digital input selecting transparent or latch mode for ALERT2; absolute limits are GND - 0.3 V to (VS) + 0.3 V. |
| 8 | NC | unconnected | No internal connection. |
| 9 | LIMIT2 | input | Analog threshold limit input for ALERT2, set as described in the Setting Alert Thresholds section; absolute limits are GND - 0.3 V to (VS) + 0.3 V. |
| 10 | DELAY | input | Analog delay timing input that sets the delayed alert response for comparator 2 (2 µs to 10 s per the datasheet); absolute limits are GND - 0.3 V to (VS) + 0.3 V. |
| 11 | ALERT2 | output | Open-drain, active-low alert output that is an underlimit alert for the INA303-Q1 (window comparator); absolute maximum is GND - 0.3 V to 6 V. |
| 12 | ALERT1 | output | Open-drain, active-low overlimit alert output; absolute maximum is GND - 0.3 V to 6 V. |
| 13 | IN- | input | Connect to the load side of the current-sensing resistor; recommended common-mode range is -0.1 V to 36 V and the absolute common-mode limit is GND - 0.3 V to 40 V. |
| 14 | IN+ | input | Connect to the supply side of the current-sensing resistor; recommended common-mode range is -0.1 V to 36 V and the absolute common-mode limit is GND - 0.3 V to 40 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-14 |
| Category | Amplifiers/Comparators |
| Pins | 14 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Differential input voltage range (A3 versions) | VIN | -25 |  | 25 | mV | VIN = VIN+ – VIN–, VREF = VS / 2, A3 versions | 5 |
| Common-mode rejection ratio (A3 versions) | CMRR | 110 | 120 |  | dB | VIN+ = 0 V to 36 V, TA = –40°C to +125°C, A3 versions | 5 |
| Offset voltage, RTI (A3 versions) | VOS | -30 | 5 | 30 | µV | A3 versions | 5 |
| Power-supply rejection ratio | PSRR | -5 | 0.3 | 5 | µV/V | VS = 2.7 V to 5.5 V, VIN+ = 12 V, TA = –40°C to +125°C | 5 |
| Input offset current | IOS | -0.01 |  | 0.01 | µA | VSENSE = 0 mV | 5 |
| Gain error (A3 versions) |  | -0.15 | 0.1 | 0.15 | % | VOUT = 0.5 V to VS – 0.5 V, A3 versions | 5 |
| Gain error drift |  |  | 3 | 10 | ppm/°C | TA= –40°C to +125°C | 5 |
| Nonlinearity error |  | -0.01 |  | 0.01 | % | VOUT = 0.5 V to VS – 0.5 V | 5 |
| Input bias current | IB |  |  | 115 | µA |  | 5 |
| Offset voltage drift, RTI | dVOS/dT |  | 0.02 | 0.25 | µV/°C | TA= –40°C to +125°C | 5 |
| Offset voltage, both comparators (A3 versions) | VOS |  | 0.5 | 4 | mV | A3 versions | 6 |
| Internal programmable delay error |  |  |  | 4 | % | TA = –40°C to +125°C | 6 |
| Delay threshold voltage | VTH | 1.21 | 1.22 | 1.23 | V | TA = –40°C to +125°C | 6 |
| Delay charging current | ID | 4.85 | 5 | 5.15 | µA | TA = –40°C to +125°C, VDELAY = 0.6 V | 6 |
| Limit threshold output current, comparator 1 | ILIMIT1 | 79.2 | 80 | 80.8 | µA | TA = 25°C, VLIMIT1 < VS – 0.6 V | 6 |
| Limit threshold output current, comparator 1 | ILIMIT1 | 78.4 |  | 81.6 | µA | TA = –40°C to +125°C, VLIMIT1 < VS – 0.6 V | 6 |
| Limit threshold output current, comparator 2 | ILIMIT2 | 79.7 | 80 | 80.4 | µA | TA = 25°C, VLIMIT2 < VS – 0.6 V | 6 |
| Limit threshold output current, comparator 2 | ILIMIT2 | 79.2 |  | 80.8 | µA | TA = –40°C to +125°C, VLIMIT2 < VS – 0.6 V | 6 |
| LATCH1, LATCH2 high-level input voltage | VIH | 1.4 |  | 6 | V | TA = –40°C to +125°C | 6 |
| LATCH1, LATCH2 low-level input voltage | VIL | 0 |  | 0.4 | V | TA = –40°C to +125°C | 6 |
| Alert low-level output voltage | VOL |  | 70 | 400 | mV | IOL = 3 mA, TA = –40°C to +125°C | 6 |
| Total alert propagation delay, comparator 1 | tp |  | 0.6 | 1 | µs | Comparator 1, input overdrive = 1 mV | 6 |
| Total alert propagation delay, comparator 2 | tp |  | 1.25 | 2 | µs | Comparator 2, input overdrive = 1 mV, delay = 100 kΩ to VS | 6 |
| Slew-rate-limited tp, comparator 1 | tp |  | 1 | 1.5 | µs | Comparator 1, VOUT step = 0.5 V to 4.5 V, VLIMIT = 4 V | 6 |
| Slew-rate-limited tp, comparator 2 (INA303-Q1) | tp |  | 1.5 | 2.5 | µs | Comparator 2 (INA303-Q1), VOUT step = 4.5 V to 0.5 V, VLIMIT = 1 V, delay = 100 kΩ to VS | 6 |
| ALERT1, ALERT2 pin leakage input current |  |  | 0.1 | 1 | µA | VOH = 3.3 V | 6 |
| LATCH1, LATCH2 digital leakage input current |  |  |  | 1 | µA | 0 V ≤ VLATCH1, VLATCH2 ≤ VS | 6 |
| Quiescent current | IQ |  | 850 | 950 | µA | TA = 25°C | 6 |
| Quiescent current | IQ |  |  | 1150 | µA | TA = –40°C to +125°C | 6 |
| Maximum capacitive load |  |  |  | 500 | pF | No sustained oscillation | 5 |
| Delay discharge resistance | RD |  | 70 |  | Ω |  | 6 |
| Comparator hysteresis (comparator 1, comparator 2) | HYS |  | 100 |  | mV | comparator 1, comparator 2 | 6 |
| Gain (A3 versions) | G |  | 100 |  | V/V | A3 versions | 5 |
| Bandwidth (A3 versions) | BW |  | 400 |  | kHz | COUT = 500 pF | 5 |
| Slew rate | SR |  | 4 |  | V/µs |  | 5 |
| Voltage noise density (RTI) |  |  | 30 |  | nV/√Hz |  | 5 |
| Supply voltage | VS |  |  | 6 | V |  | 4 |
| Differential input voltage (IN+, IN–) | VIN | -40 |  | 40 | V | Differential (VIN+) – (VIN–) | 4 |
| Common-mode input voltage (IN+, IN–) |  |  |  | 40 | V | Common-mode; minimum printed as GND – 0.3 V | 4 |
| Digital output ALERT1, ALERT2 |  |  |  | 6 | V | Minimum printed as GND – 0.3 V | 4 |
| Junction temperature | TJ |  |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| Common-mode input voltage | VCM | -0.1 | 12 | 36 | V |  | 4 |
| Operating supply voltage | VS | 2.7 | 5 | 5.5 | V |  | 4 |
| Operating free-air temperature | TA | -40 |  | 125 | °C |  | 4 |
| Junction-to-ambient thermal resistance | RθJA |  | 110.2 |  | °C/W | PW (TSSOP), 14 pins | 4 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 35.1 |  | °C/W | PW (TSSOP), 14 pins | 4 |
| Junction-to-board thermal resistance | RθJB |  | 53.2 |  | °C/W | PW (TSSOP), 14 pins | 4 |
| Junction-to-top characterization parameter | ψJT |  | 2.3 |  | °C/W | PW (TSSOP), 14 pins | 4 |
| Junction-to-board characterization parameter | ψJB |  | 52.4 |  | °C/W | PW (TSSOP), 14 pins | 4 |

## CAD (KiCad official)

- Symbol: `INA303A3QPWRQ1`
- Footprint: `Package_SO:TSSOP-14_4.4x5mm_P0.65mm`
- 3D model: TSSOP-14 (KiCad packages3D, STEP)
- 3D model files: `ina303a3qpwrq1-etched.step` / `ina303a3qpwrq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ina303a3qpwrq1.step` / `ina303a3qpwrq1.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/ina302-q1) (40 pp, sha256 `9d26f5e6ff86755e`, retrieved 2026-10-11, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ina303a3qpwrq1-datasheet.pdf)