# SOYO NEMA 17 Stepper 42×38 mm 1.68 A

> SOYO SY42STH38-1684A NEMA 17 hybrid bipolar stepper: 1.8° step (200 steps/rev), 1.68 A per coil at 2.8 V, 1.65 Ω / 3.2 mH per phase, 36 N·cm (3.7 kg·cm) holding torque, 42.3 mm square × 38 mm body, 5 mm D-shaft, 285 g, four 30 cm bare leads.

- Manufacturer: SOYO
- Part number: SY42STH38-1684A
- Category: Motors
- Canonical page: https://www.xirkit.io/products/soyo-nema-17-stepper-42-38-mm-1-68-a-3991
- Pinout: https://www.xirkit.io/products/soyo-nema-17-stepper-42-38-mm-1-68-a-3991/pinout
- Structured JSON: https://www.xirkit.io/products/soyo-nema-17-stepper-42-38-mm-1-68-a-3991/data.json
- Source: Xirkit structured parts catalog — every value traced to a cited document; unknowns are explicit.

## Key specifications

| Property | Value |
| --- | --- |
| Motor type | stepper |
| Rated voltage | 2.8 V |
| Holding torque | 0.36 N·m |
| Rated current | 1.68 A |
| Step angle | 1.8° |
| Shaft diameter | 5 mm |
| Dimensions | 42.3 × 42.3 × 62 mm |
| Operating temperature | -20 to 50 °C |
| Certifications | RoHS 3 |

## Pinout (4 pins, 0 with electrical limits)

| Pin | Position | Kind | Chip pad | Functions | VIH | VIL | VOH | VOL | IOH | IOL | 5 V tolerant |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| BLK | — | phase a plus | — | blk | — | — | — | — | — | — | — |
| GRN | — | phase a minus | — | grn | — | — | — | — | — | — | — |
| RED | — | phase b plus | — | red | — | — | — | — | — | — | — |
| BLU | — | phase b minus | — | blu | — | — | — | — | — | — | — |

## Where to buy

| Supplier | Price | Stock | Checked | URL |
| --- | --- | --- | --- | --- |
| www.pololu.com | 35.12 USD | in_stock | 2026-09-28 | https://www.pololu.com/product/2267 |

## FAQ

**How much does the SOYO NEMA 17 Stepper 42×38 mm 1.68 A cost?**

From $35.12 at www.pololu.com. Prices are observed unit prices before tax and shipping.

**What are the SOYO NEMA 17 Stepper 42×38 mm 1.68 A dimensions?**

42.3 × 42.3 × 62 mm. A STEP model is available for enclosure fit checks.

**Where does this SOYO NEMA 17 Stepper 42×38 mm 1.68 A 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

- [SOYO NEMA 17 Stepper 42×38 mm 1.68 A datasheet](https://www.pololu.com/file/0J714/SY42STH38-1684A.pdf)
- [www.pololu.com listing](https://www.pololu.com/product/2267)