# TMCS1108A3BQDRQ1

**Texas Instruments** · Current Sensors · SOIC-8

TMCS1108A3BQDRQ1 from Texas Instruments, in a SOIC-8. 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 | IN+ | input | Current-input positive terminal; the input current flows through the internal 1.8 mΩ lead frame between IN+ and IN-, and input voltages must stay within -100 V to 100 V peak relative to GND (absolute maximum ±120 V). |
| 2 | IN+ | input | Second current-input positive terminal, connected to pin 1 for the same current path; input voltages must stay within -100 V to 100 V peak relative to GND (absolute maximum ±120 V). |
| 3 | IN- | input | Current-input negative terminal; the current entering IN+ and leaving through IN- sets positive polarity, and input voltages must stay within -100 V to 100 V peak relative to GND (absolute maximum ±120 V). |
| 4 | IN- | input | Second current-input negative terminal, connected to pin 3 for the same current path; input voltages must stay within -100 V to 100 V peak relative to GND (absolute maximum ±120 V). |
| 5 | GND | power_in | Analog ground and reference for the low-voltage side; the input voltages VIN+ and VIN- are specified relative to this pin, and the absolute maximum rating for the VS and VOUT pins is referenced to it. |
| 6 | NC | unconnected | No internal connection; the pin can tolerate capacitive or resistive connections to GND or VS, and tying it to GND is recommended where acceptable, with input impedance of 1 MΩ when GND < VNC < VS. |
| 7 | VOUT | output | Analog output voltage proportional to the input current; the linear swing is limited to about 0.02-0.1 V below VS and 5-10 mV above GND at 10 kΩ load, the short-circuit current is 90 mA, and the maximum capacitive load without sustained oscillation is 1 nF. |
| 8 | VS | power_in | Analog supply for the low-voltage side, with a recommended operating range of 3 V to 5.5 V (absolute maximum 6 V relative to GND), and a 0.1 µF low-ESR decoupling capacitor should be placed as close as possible between VS and GND. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Magnetic Sensors |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `TMCS1108A3BQDRQ1`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `tmcs1108a3bqdrq1-etched.step` / `tmcs1108a3bqdrq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tmcs1108a3bqdrq1.step` / `tmcs1108a3bqdrq1.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/ds/symlink/tmcs1108-q1.pdf) (42 pp, sha256 `f7171fc700f01799`, 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/tmcs1108a3bqdrq1-datasheet.pdf)