# A5947GETTR-T

**Allegro MicroSystems, LLC** · Pre-ordered Products · QFN-28-EP(5x5)

A5947GETTR-T from Allegro MicroSystems, LLC, in a QFN-28-EP(5x5). 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 | OUTA | output | Motor terminal A, with absolute maximum output voltage of VBB + 1 V. |
| 2 | n/c | unconnected | No connect. |
| 3 | LSS | passive | Low side source connection. |
| 4 | n/c | unconnected | No connect. |
| 5 | OUTB | output | Motor terminal B, with absolute maximum output voltage of VBB + 1 V. |
| 6 | OUTC | output | Motor terminal C, with absolute maximum output voltage of VBB + 1 V. |
| 7 | n/c | unconnected | No connect. |
| 8 | n/c | unconnected | No connect. |
| 9 | n/c | unconnected | No connect. |
| 10 | n/c | unconnected | No connect. |
| 11 | n/c | unconnected | No connect. |
| 12 | VREF | power_out | Reference voltage output of 3.3 V typical (3.15 to 3.45 V) for loads of 0 to 20 mA. |
| 13 | n/c | unconnected | No connect. |
| 14 | TEST | output | Open-drain logic output that is low when the motor is off and high at the end of open loop startup. |
| 15 | nFAULT | output | Active-low logic output that signals VBB undervoltage, VBB overvoltage, thermal shutdown, VCP undervoltage, rotor lock and output VDS (OCP) faults. |
| 16 | n/c | unconnected | No connect. |
| 17 | SPD | input | Speed demand input (PWM duty or analog voltage), which also serves as the I2C clock line SCL; absolute maximum -0.3 to 6 V. |
| 18 | FG | bidirectional | Open-drain speed output that also serves as the I2C data line SDA; absolute maximum -0.3 to 6 V. |
| 19 | GND | power_in | Ground. |
| 20 | n/c | unconnected | No connect. |
| 21 | n/c | unconnected | No connect. |
| 22 | n/c | unconnected | No connect. |
| 23 | CP1 | passive | Charge pump capacitor connection (0.1 µF X7R in the typical application). |
| 24 | CP2 | passive | Charge pump capacitor connection. |
| 25 | VCP | passive | Charge pump capacitor/output node, rated VBB - 0.3 to VBB + 8 V. |
| 26 | VBB | power_in | Input supply, operating 4 to 40 V with absolute maximum of -0.7 to 40 V. |
| 27 | n/c | unconnected | No connect. |
| 28 | n/c | unconnected | No connect. |
| 29 | PAD | passive | Exposed pad for enhanced thermal dissipation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Allegro MicroSystems, LLC |
| Package | QFN-28-EP(5x5) |
| Category | Solders / Accessories / Batteries |
| Pins | 29 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper |  | 28-contact QFN (package ET), on 2-sided PCB 1-in.2 copper 40 °C/W | 2 |

## CAD (KiCad official)

- Symbol: `A5947GETTR-T`
- Footprint: `Package_DFN_QFN:QFN-28-1EP_5x5mm_P0.5mm_EP3.35x3.35mm`
- 3D model: QFN-28-EP(5x5) (KiCad packages3D, STEP)
- 3D model files: `a5947gettr-t-etched.step` / `a5947gettr-t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `a5947gettr-t.step` / `a5947gettr-t.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Allegro MicroSystems, LLC datasheet](docs/a5947gettr-t-datasheet.pdf) (22 pp, sha256 `b87bfe434c54d3c2`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/a5947gettr-t-datasheet.pdf)