An ESC (or 4)

Name: OpenESC
Brand: OpenDrone
SKU: OPENESC-3030

6 mosfets per motor, 2 for each phase. Driven by a gate driver, controlled by a microcontroller. Duplicate that 4 times et voila, 'An ESC'.

Model· pick your build

Coming soonSKU OPENESC-3030

Teardown

AT32F421 motor MCU×4
NSG2065Q gate driver×4
SP40N01 power MOSFET (both sides)×24
INA186A3 current sense×1
0.2 mΩ sense shunt×2
TLV767 3.3 V LDO×1
LMR54406 buck×1
JST-SH FC connector×1
Motor solder pads×1
Battery pads×1
Signal pads×1
Bulk ceramic capacitor array×48

Inspect interactively ↗

Published so you can study it. Produced so you don't have to.

Study

GitHub repo ↗

Schematic · PCB · BOM · 3D STEP · design notes

CERN-OHL-S v2 ↗

Changelog

Commit history ↗

Every revision, public on GitHub

In the box

1×OpenESC
2×8-pin JST cable
1×XT battery pigtail
4×M3 grommets
1×Low-ESR Electrolytic Capacitor

Provenance

DesignedLeuven, Belgium · schematic, PCB, BOM, firmware partnerships
AssembledShenzhen, China · first runs, while we bring up an EU line
NextEU assembly · in planning

Every spec, one table

Continuous: 60 A / channel
Firmware: AM32, bootloader pre-loaded
ESC protocol: DShot, bidirectional DShot telemetry
Telemetry: Over the motor signal lines; analog current on the FC harness
Input: 3–6S LiPo
BEC: None; the FC harness carries VBAT
MCU: 4× AT32F421G8U7, one per motor, 120 MHz
Gate driver: 4× NSG2065Q
MOSFETs: 24× SP40N01GHNK, 6 per motor, 40 V / 1.2 mΩ
Current sense: INA186A3 + 2× 0.2 mΩ shunt · 10 mV/A, 330 A full-scale
TVS protection: 3× SMBJ24A on the battery rail
Power rails: LMR54406DBVR buck + TLV76733 LDO
FC connector: JST-SH 8-pin (SM08B-SRSS-TB), Betaflight pinout
Mounting: 30.5 × 30.5 mm, Ø4.0 mm holes (M3)
PCB: 6-layer, 1.7 mm, 2 oz outer copper, ENIG
License: CERN-OHL-S-2.0

You asked. We changed it.

Open hardware means the feedback loop is public too. These are design changes that started as an issue or a PR from someone who isn't us, receipts linked.

Vishal01Mehra ↗ The FC connector and pinout didn’t follow the Betaflight connector standard. He sent the fix as a PR, not just a complaint.
Merged. The board switched to the JST-SH connector with the corrected Betaflight-standard pinout; that’s the connector on every OpenESC since.