# goBILDA Yellow Jacket 99.5:1 Gearmotor

> goBILDA 5203-2402-0100 Yellow Jacket is a 12 V RS-555 brushed DC planetary gearmotor with 99.5:1 steel gearing, 60 rpm no-load output speed, 133.2 kg cm stall torque, 8 mm REX output shaft, and a 3.3 to 5 V magnetic quadrature encoder rated at 2786.2 PPR at the output shaft.

- Manufacturer: goBILDA
- Part number: 5203-2402-0100
- Category: Motors
- Canonical page: https://www.xirkit.io/products/gobilda-yellow-jacket-99-5-1-gearmotor-0bb3
- Pinout: https://www.xirkit.io/products/gobilda-yellow-jacket-99-5-1-gearmotor-0bb3/pinout
- Structured JSON: https://www.xirkit.io/products/gobilda-yellow-jacket-99-5-1-gearmotor-0bb3/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 | 13.062 N·m |
| No-load speed | 60 rpm |
| Gear ratio | 99.5:1 |
| Shaft diameter | 8 mm |
| Encoder | relative magnetic Hall-effect quadrature encoder, 2786.2 PPR at output shaft |
| Dimensions | 37.5 × 37.5 × 148.6 mm |

## Pinout (2 pins, 0 with electrical limits)

| Pin | Position | Kind | Chip pad | Functions | VIH | VIL | VOH | VOL | IOH | IOL | 5 V tolerant |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| MOTOR | 3.5 mm FH-MC bullet connectors | motor plus | — | motor | — | — | — | — | — | — | — |
| ENC | 4-position JST XH [FH-MC] | signal | — | enc | — | — | — | — | — | — | — |

## Where to buy

| Supplier | Price | Stock | Checked | URL |
| --- | --- | --- | --- | --- |
| www.gobilda.com | 54.99 USD | in_stock | 2026-09-29 | https://www.gobilda.com/5203-series-yellow-jacket-planetary-gear-motor-99-5-1-ratio-24mm-length-8mm-rex-shaft-60-rpm-3-3-5v-encoder/ |

## FAQ

**How much does the goBILDA Yellow Jacket 99.5:1 Gearmotor cost?**

From $54.99 at www.gobilda.com. Prices are observed unit prices before tax and shipping.

**What are the goBILDA Yellow Jacket 99.5:1 Gearmotor dimensions?**

37.5 × 37.5 × 148.6 mm. A STEP model is available for enclosure fit checks.

**Where does this goBILDA Yellow Jacket 99.5:1 Gearmotor 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

- [goBILDA Yellow Jacket 99.5:1 Gearmotor datasheet](https://www.gobilda.com/content/spec_sheets/5203-2402-0100_spec_sheet.pdf)
- [www.gobilda.com listing](https://www.gobilda.com/5203-series-yellow-jacket-planetary-gear-motor-99-5-1-ratio-24mm-length-8mm-rex-shaft-60-rpm-3-3-5v-encoder/)

## Part graph

### Alternatives (by use case)

- [Pololu #4755 100:1 37D Gearmotor](https://www.xirkit.io/products/pololu-4755-100-1-37d-gearmotor-e3ef) — Both serve mobile robot drive trains — check the trade-offs; $60.95 vs $54.99