# Pololu #4863 20.4:1 25D Gearmotor MP 12V

> Pololu #4863 is a 12 V medium-power (MP) brushed DC 25D metal gearmotor with 20.4:1 spur reduction: 380 rpm and 0.10 A no-load, 3.2 kg·cm / 1.8 A stall (extrapolated), 43 % peak efficiency, Ø25 mm × 65 mm, 4 mm D-shaft 12.5 mm long, two M3 face holes, 98 g, and a 48 CPR Hall quadrature encoder on the motor shaft (979.62 counts per output revolution).

- Manufacturer: Pololu
- Part number: 4863
- Category: Motors
- Canonical page: https://www.xirkit.io/products/pololu-4863-20-4-1-25d-gearmotor-mp-12v-3d78
- Pinout: https://www.xirkit.io/products/pololu-4863-20-4-1-25d-gearmotor-mp-12v-3d78/pinout
- Structured JSON: https://www.xirkit.io/products/pololu-4863-20-4-1-25d-gearmotor-mp-12v-3d78/data.json
- Source: Xirkit structured parts catalog — every value traced to a cited document; unknowns are explicit.

## Key specifications

| Property | Value |
| --- | --- |
| Motor type | gearmotor |
| Rated voltage | 12 V |
| Stall torque | 0.314 N·m |
| No-load speed | 380 rpm |
| Gear ratio | 20.4:1 |
| Shaft diameter | 4 mm |
| Encoder | Hall quadrature encoder; 48 CPR at the motor shaft, 979.62 CPR at the output shaft |
| Dimensions | 25 × 25 × 77.5 mm |

## Pinout (6 pins, 0 with electrical limits)

| Pin | Position | Kind | Chip pad | Functions | VIH | VIL | VOH | VOL | IOH | IOL | 5 V tolerant |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Red | 1x6 female 2.54 mm header | motor plus | — | red | — | — | — | — | — | — | — |
| Black | 1x6 female 2.54 mm header | motor minus | — | black | — | — | — | — | — | — | — |
| Green | 1x6 female 2.54 mm header | ground | — | ground | — | — | — | — | — | — | — |
| Blue | 1x6 female 2.54 mm header | supply | — | blue | — | — | — | — | — | — | — |
| Yellow | 1x6 female 2.54 mm header | signal | — | yellow | — | — | — | — | — | — | — |
| White | 1x6 female 2.54 mm header | signal | — | white | — | — | — | — | — | — | — |

## Where to buy

| Supplier | Price | Stock | Checked | URL |
| --- | --- | --- | --- | --- |
| www.pololu.com | 53.95 USD | in_stock | 2026-10-02 | https://www.pololu.com/product/4863 |

## FAQ

**How much does the Pololu #4863 20.4:1 25D Gearmotor MP 12V cost?**

From $53.95 at www.pololu.com. Prices are observed unit prices before tax and shipping.

**What are the Pololu #4863 20.4:1 25D Gearmotor MP 12V dimensions?**

25 × 25 × 77.5 mm. A STEP model is available for enclosure fit checks.

**Where does this Pololu #4863 20.4:1 25D Gearmotor MP 12V data come from?**

Every value in this record is traced to a source — 2 documents including the board and chip datasheets — with the page and table cited per value. Unknowns are left explicit, never guessed.

## Sources

- [Pololu #4863 20.4:1 25D Gearmotor MP 12V datasheet](https://www.pololu.com/file/0J1829/pololu-25d-metal-gearmotors-rev-2-0.pdf)
- [www.pololu.com listing](https://www.pololu.com/product/4863)

## Part graph

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