65A 8S Mini 4-in-1 ESC
The UESC-65-8S-4I-A is a compact 65A 8S 4-in-1 ESC designed for FPV and UAV teams working with 20 × 20 mm mounting patterns. It combines four motor-control channels, a 2–8S LiPo input range and an eight-layer, 2oz copper PCB in a 34 × 42 mm board outline. Multiple throttle protocols support integration with compatible flight controllers. UltroNiu supports product sourcing and separate OEM PCB/PCBA projects.
65A motor control in a 20 mm mounting footprint
The UESC-65-8S-4I-A is built for quad-motor platforms where stack compatibility and available installation space are important selection criteria. Its 20 × 20 mm mounting pattern fits a compact stack format, while the 34 × 42 mm board outline and power terminals must also be considered during installation.
Compact mounting without overlooking power-system requirements
Four motor outputs share a single PCB assembly. The eight-layer, 2oz copper construction creates routing space for power paths and control circuits within the board envelope.
20 mm installation
Defined 20 × 20 mm mounting holes for compact flight-controller stack planning.
65A / 70A current class
Specified continuous and peak current ratings for preliminary motor-drive selection.
8-layer, 2oz PCB
Multilayer copper routing for the switching stage and four-channel power distribution.
UESC-65-8S-4I-A specifications
| Parameter | Specification |
|---|---|
| Model | UESC-65-8S-4I-A |
| Product configuration | 4-in-1 ESC / four motor channels |
| Input voltage | 2–8S LiPo |
| Continuous current rating | 65A |
| Peak current rating | 70A |
| Mounting-hole spacing | 20 × 20 mm |
| PCB outline | 34 × 42 mm |
| Product net weight | 11 g |
| PCB construction | 8 layers / 2oz copper |
| Main controller | AT32F421, up to 128MHz |
| Gate driver | FD6288Q |
| Power MOSFET rating | 40V-class devices |
| Control protocols | PWM, OneShot125, OneShot42, MultiShot, DShot150/300/600 |
| Firmware reference | 32.9-series ESC firmware |
| Package dimensions | 64 × 64 × 35 mm |
| Packaged weight | 52 g |
Current ratings are product specifications; installation-specific operating limits depend on the motor load, cooling and electrical conditions.
20 × 20 mm mounting: check the complete stack envelope
Mounting pattern and board outline serve different purposes
The 20 × 20 mm mounting pattern identifies hole-center spacing. The physical board extends to approximately 34 × 42 mm, so frame plates, standoffs, wiring exits and neighboring flight-controller components must be checked against the full assembly outline.
For compact builds, confirm screw hardware, board orientation, connector access, power-lead bend radius and clearance above heat-generating components.
8-layer, 2oz PCB architecture for a compact power stage
The PCB construction combines eight copper layers with a specified 2oz copper weight. In a compact ESC, copper geometry, via transitions, high-current terminations and component layout must be evaluated as one electrical and thermal system.
Current paths
Heavy-current routing connects the battery input to the MOSFET switching stages and motor outputs.
Switching components
40V-class MOSFETs and an FD6288Q gate-driver configuration form the motor power stage.
Power conditioning
Onboard regulation and filtering components support the controller and power-stage drive circuitry.
Thermal performance is a system-level consideration
Conductor loss, MOSFET switching and conduction loss, solder joints, thermal paths and airflow all influence board temperature. The 2oz copper construction is a hardware specification, not a substitute for thermal validation in the intended aircraft.
Flight-controller communication and motor response
AT32F421 control platform
The ESC uses an AT32F421 microcontroller and a 32.9-series firmware configuration. It supports conventional and digital throttle signals for integration with compatible flight controllers.
The listed interfaces include PWM, OneShot125, OneShot42, MultiShot and DShot150/300/600. Damped Light braking provides an active motor-deceleration control mode.
Confirm the FC interface before assembly
Review the actual connector pinout, current-sense output, motor numbering and firmware configuration against your flight-controller wiring harness before applying power.
| Interface group | Supported protocols |
|---|---|
| Standard throttle | PWM |
| OneShot | OneShot125 / OneShot42 |
| Fast analog | MultiShot |
| Digital commands | DShot150 / 300 / 600 |
| Motor deceleration | Damped Light active braking |
Where the 65A Mini ESC fits in UAV development
Compact FPV quadcopters
For builds designed around a 20 mm mounting pattern that need four motor outputs and 2–8S battery compatibility.
Integrated UAV stacks
For hardware teams matching ESC, flight controller and power wiring within a defined stack envelope.
OEM reference designs
For procurement and engineering teams evaluating a 65A-class ESC before choosing a standard configuration or custom hardware route.
Compare mounting, motor load and thermal constraints rather than selecting by the printed current rating alone. For a larger mounting pattern, see the 55A 8S 4-in-1 ESC.
Manufacturing considerations behind multilayer ESC PCBs
Dense power electronics require coordinated PCB stack-up, imaging, conductor formation, solder-mask definition and electrical inspection. UltroNiu provides multilayer PCB fabrication for UAV electronics and customer-specific motor-control boards.
Assembly and inspection for ESC electronics programs
Power-stage PCBA and component control
Custom ESC projects may combine PCB fabrication, component sourcing, SMT assembly, process inspection and defined electrical or functional test requirements under one manufacturing scope.
For volume programs, approved BOM revisions, PCB data, solder-joint inspection and acceptance criteria should be controlled against the customer-approved hardware configuration.
Standard ESC sourcing or a custom PCB/PCBA project
Product procurement
Discuss quantity, delivery schedule, packaging and the intended 65A 8S configuration for standard product sourcing.
Interface adaptations
Review FC wiring, connector orientation, harness requirements and mechanical fit as part of a defined OEM change request.
Custom hardware build
Supply approved Gerber files, BOM, drawings and acceptance requirements for a separate ESC PCB/PCBA manufacturing program.
65A 8S Mini ESC FAQs
What is the mounting pattern of the 65A 8S Mini 4-in-1 ESC?
The mounting-hole spacing is 20 × 20 mm. The PCB outline is 34 × 42 mm, so check the complete board envelope and wiring clearance when selecting the flight-controller stack.
What battery input and current ratings does this ESC support?
The specified input is 2–8S LiPo, with a 65A continuous current rating and a 70A peak current rating. Actual integration limits depend on motor loading, power connections and cooling conditions.
How does the eight-layer, 2oz copper PCB affect ESC integration?
The multilayer construction provides routing space for four motor power stages and control circuits within a compact board. Copper geometry and airflow still need to be considered in thermal and current-path assessment.
Which throttle protocols are supported?
The ESC supports PWM, OneShot125, OneShot42, MultiShot and DShot150/300/600, subject to compatible flight-controller configuration and wiring.
Which controller is used on this ESC?
The listed controller is AT32F421, with a 32.9-series ESC firmware reference and an FD6288Q gate-driver architecture.
Does a 20 mm mounting pattern guarantee compatibility with any 20 mm flight controller?
No. Confirm the physical board outline, connector pinout, standoff height, fastener clearance and cable routing for the complete assembly.
Can UltroNiu support OEM sourcing and custom ESC PCB/PCBA manufacturing?
Yes. UltroNiu can discuss product sourcing and separately scoped custom PCB fabrication, component sourcing, assembly and project-specific verification requirements.
Discuss your 65A Mini ESC integration or procurement
Share your battery configuration, motors, flight-controller model or connector pinout, mounting constraints, required quantity and target schedule. For custom hardware, include Gerber, BOM and drawings where available.
Request an Engineering ReviewEmail Product RequirementsDiscuss via WhatsAppRelated Products
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70A 8S 4-in-1 ESC
70A 8S 4-in-1 ESC for UAVs with 2–8S LiPo input, 75A peak rating, STM32G071 control, 8-layer 3oz PCB and DShot600. OEM sourcing and PCBA support.
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