Electronic Speed Controller (ESC)
ElectronicsmediumConverts flight controller signals into three-phase AC power for brushless motors. Modern ESCs use BLHeli_32 or AM32 firmware. Often built as a 4-in-1 board to save weight.
What this part does
4 functions- Turns flight-controller signals into three-phase power for motors.
- Throttles each motor independently, hundreds of times per second.
- Protects the battery from short-circuits and stalls.
- Reports current draw back to the flight controller.
How to make it
4 steps- 1PCB fabThick 2oz+ copper traces
- 2SMTMOSFETs + gate driver
- 3Power solderHigh-current pads
- 4HV testUp to 6S / 25.2V
Each step happens at a real manufacturer — scroll down to see who can do it and where.
Manufacturing Processes
Materials
Key Requirements
- •High-current PCB traces (copper weight ≥2oz)
- •Power MOSFET soldering capability
- •Thermal management design
- •High-voltage testing (up to 6S / 25.2V)
Bill of Materials
- 1.Gate driver IC
- 2.Power MOSFETs (6 per motor × 4)
- 3.Current sensor
- 4.Input capacitors
- 5.Signal connector to FC
Matched Manufacturers
9 of 9 · sorted by scoreInferred from Wayback enrichment of company website
- +Offers pcb fabrication
- −Material FR4 PCB Substrate not listed (may still be capable)
- +Quantity 200 within range (0–∞)
Inferred from Wayback enrichment of company website
- +Offers pcb fabrication
- −Material FR4 PCB Substrate not listed (may still be capable)
- +Quantity 200 within range (0–∞)
Inferred from Wayback enrichment of company website
- +Offers pcb fabrication
- −Material FR4 PCB Substrate not listed (may still be capable)
- +Quantity 200 within range (0–∞)
Inferred from Wayback enrichment of company website
- +Offers pcb fabrication
- −Material FR4 PCB Substrate not listed (may still be capable)
- +Quantity 200 within range (0–∞)
Inferred from Wayback enrichment of company website
- +Offers pcb fabrication
- −Material FR4 PCB Substrate not listed (may still be capable)
- +Quantity 200 within range (0–∞)
Inferred from Wayback enrichment of company website
- +Offers pcb fabrication
- −Material FR4 PCB Substrate not listed (may still be capable)
- +Quantity 200 within range (0–∞)
Inferred from Wayback enrichment of company website
- +Offers smt assembly
- −Material FR4 PCB Substrate not listed (may still be capable)
- +Quantity 200 within range (0–∞)
Inferred from Wayback enrichment of company website
- +Offers smt assembly
- −Material FR4 PCB Substrate not listed (may still be capable)
- +Quantity 200 within range (0–∞)
Inferred from Wayback enrichment of company website
- +Offers smt assembly
- −Material FR4 PCB Substrate not listed (may still be capable)
- +Quantity 200 within range (0–∞)
Supply Chain Decision Guide
Compare sourcing strategies, understand risks, and see the path to production.
A 4-in-1 ESC uses the same SMT process as the FC. If you're assembling FCs locally, adding ESCs is incremental — bundle them at HFA and share setup costs.
Sourcing Options
Design 4-in-1 ESC based on open-source BLHeli_32/AM32 target. Heavy-copper PCBs from EU fab, SMT assembly at HFA alongside FC production.
- Bundle with FC at same partner — shared setup, lower total cost
- Custom current rating and MOSFET selection for your motors
- EU compliance built-in
- Fast design revision cycle — 2 weeks to next version
- Heavy-copper (≥2oz) PCBs cost more than standard
- Power MOSFET thermal design is critical — requires expertise
- 24 MOSFETs per board — complex assembly
- Requires high-current testing equipment (100A+)
Source from EU-based drone electronics distributors or white-label from brands with EU warehouses. T-Motor and Hobbywing have EU distribution.
- Proven thermal design — already tested at high current
- No heavy-copper PCB design needed
- Fast availability from EU warehouse (1-2 weeks)
- CE/RoHS pre-certified
- Limited to existing current ratings and form factors
- Higher cost (€20-35) — paying distributor margin
- No firmware customization
- Dependent on brand's EU stock levels
Partner with EU power electronics companies (e.g., Infineon ecosystem partners, German ESC designers) for co-developed high-current ESC optimized for your motor specs.
- Access to advanced MOSFET/GaN technology
- Optimized for your specific motor (3115 900KV)
- Shared thermal testing infrastructure
- Potential for automotive-grade reliability
- Long co-development timeline (4-6 months)
- Higher NRE — €10-20K for custom design
- Power electronics partners may have high MOQ
- Complex partnership structure
Source from established Chinese ESC OEMs — Aikon, Foxeer, T-Motor China direct.
- Cheapest option (€8-18)
- Proven thermal design at high current
- Tested with common motor combinations
- No IP — design belongs to OEM
- 6-8 week lead time + customs
- Quality variance — MOSFET substitutions without notice
- No firmware control
- Full China dependency
Supply Chain Risks
100A 4-in-1 ESCs dissipate significant heat. Poor thermal design causes desyncs or fires.
≥2oz copper PCBs are specialty items. Not all EU fabs offer them quickly.
Path to Production — 12 weeks total
Design 4-in-1 ESC with BLHeli_32 or AM32 target. Heavy-copper 2oz+ layout.
Build 5 prototypes. Thermal test at full current (100A). Validate MOSFET temp.
Test with target motors (3115 900KV). Validate startup, throttle response, sync.
200-unit batch at HFA. Full functional test + 10-second burn-in.
Open Source Resources
Regulatory & Compliance
- ▸CE marking required (LVD + EMC)
- ▸RoHS 3 compliance
- ▸High-voltage safety testing (25.2V max)
Deep Intelligence
Design best practices, technology evolution forecasts, materials supply chain analysis, and prototyping partners.
