55A 8S 4-in-1 ESC
UESC-55-8S-4I-A is a 55A 8S 4-in-1 ESC for FPV brands, UAV manufacturers and integration teams. It brings four motor channels, a six-layer 3oz copper PCB and multiple throttle-control interfaces into a 30.5mm mounting format. For OEM procurement, the product has a defined mounting pattern, power-stage layout and controller interface. PCB/PCBA manufacturing support is available for separate custom hardware projects.
A 55A ESC built around high-current PCB and four-channel integration
The UESC-55-8S-4I-A combines four motor-control outputs with a 30.5 × 30.5 mm mounting pattern. Its hardware design uses a six-layer, 3oz copper PCB, an FD6288Q gate-driver arrangement and multiple throttle-control protocols.
Heavy-copper multilayer construction supports the power-routing and heat-spreading design of the ESC.
High-current switching devices combined with input filtering and carefully planned component placement.
Integrated gate-drive circuitry for the motor power stage, with onboard LDO power regulation.
Specified resin-via and solder-mask process features for a compact multilayer power board.
Analog and digital throttle-signal options for integration with compatible flight controllers.
Active-braking functionality for more responsive motor deceleration under supported settings.
UESC-55-8S-4I-A technical specifications
| Parameter | Specification |
|---|---|
| Model | UESC-55-8S-4I-A |
| Product type | 4-in-1 ESC / four motor channels |
| Input | 2–8S LiPo |
| Rated continuous current | 55A |
| Peak current | 60A |
| Board dimensions | 38.5 × 41 mm |
| Mounting-hole spacing | 30.5 × 30.5 mm |
| Board weight | 12.5 g |
| PCB stack-up | 6 layers, 3oz copper |
| Power-stage design | 40V-class MOSFETs, FD6288Q driver |
| PCB processes | Resin-filled vias, black solder mask, metallized pad edges |
| Control protocols | PWM, Oneshot125, Oneshot42, Multishot, DShot150/300/600 |
| Braking | Damped Light active braking |
| Supply mode | Standard reference build or OEM/ODM customization |
This configuration is available as a reference for repeat production. PCB design, selected components, connector arrangement, assembly requirements and test scope can be adapted to your OEM project.
Power-stage components and gate-drive architecture
Switching devices, gate drive and regulation
40V-class MOSFETs form the switching power stage, while the FD6288Q driver circuit manages gate-drive signals. High-quality capacitors support supply filtering, and industrial-grade LDO regulation supports onboard control circuitry.
The power stage is implemented on a six-layer, 3oz copper PCB. Its high-current pads, copper distribution and power connections are considered together with assembly access and heat removal.
Motor-control protocols and Damped Light braking
Signal interfaces for compatible flight controllers and existing platform architectures.
An additional throttle-input mode for suitable controller configurations.
Digital throttle command options for supported FC/ESC integration.
Damped Light active braking
Active braking is intended to improve deceleration response when the flight controller reduces the commanded throttle. This is a motor-control feature, not a claim about flight time or measured efficiency for every aircraft.
During integration, verify control configuration, motor direction and behavior under the selected operating conditions.
Mounting, motor outputs and flight-controller interface
Integration checklist
Mechanical: 30.5 × 30.5 mm hole pattern, board outline and stack clearance.
Electrical: battery polarity, cable sizing, FC connector, signal ordering and current sensing.
System: flight controller mapping, motor direction, cooling and test procedure.
FC connector assignments and wiring can be specified to match your controller and harness during OEM engineering review.
Six-layer, 3oz PCB fabrication for high-current ESC assemblies
From CAM and stack-up review through imaging, copper processing, solder mask and bare-board inspection, fabrication is controlled against the approved ESC PCB data. Process photos below document available manufacturing operations; they are not a test report for this model.
Manufacturing controls aligned to the design
CAM review, copper and laminate selection, routing geometry, solder-mask opening, pad finish and panelization are coordinated with the specific board requirements.
Inspection planning is tied to production data rather than being treated as a separate marketing checklist.
Component procurement, SMT assembly and ESC build integration
PCB fabrication and assembly under one project scope
ULTRONIU supports BOM sourcing, PCBA process planning, component placement, soldering inspection and assembly review for custom drone electronics.
For OEM programs, approved component substitutions, PCB revisions and test requirements should be tied to a controlled product configuration before release to production.
Quality controls from bare PCB to completed ESC assembly
The quality plan can include fabrication inspection, electrical testing of bare boards, assembly inspection and defined powered functional checks. For volume ESC orders, motor-control and load-test acceptance criteria should be agreed for the approved hardware configuration.
55A ESC procurement and OEM supply options
Repeat supply
Use the 55A 8S configuration as the procurement starting point, with quantity, packaging and delivery arrangements confirmed for the order.
Build-to-print
Manufacture to approved Gerber, BOM, drawings and test requirements, with engineering review before production.
Customized ESC hardware
Evaluate FC connection, board outline, components and PCB/PCBA construction according to the platform requirements.
For volume programs
Align prototype feedback, assembly revisions, test methods, material availability and production release before increasing order volumes.
Questions from FPV and UAV OEM buyers
Can I order the standard 55A ESC without changing the design?
Yes. Share the required quantity, delivery requirements and intended configuration so the supply arrangement can be reviewed.
Can the PCB layout or FC connector be customized?
Yes. Customization can include board layout, mounting features, component selection, FC interface and harness requirements, subject to engineering review.
What should I send to start an engineering review?
Send your battery and motor requirements, FC model or pinout, installation space, expected order quantity and available Gerber/BOM information.
Can you support PCB fabrication and PCBA assembly as one project?
Yes. PCB manufacturing, component sourcing, assembly and agreed inspection or test scope can be included in the project.
Do you provide testing for custom ESC hardware?
Test items and acceptance criteria can be defined for the approved configuration, including power-on, motor-control and project-specific verification requirements.
Request a 55A ESC quotation
Share the required quantity, battery configuration, FC interface and target delivery schedule. For customization, include Gerber files, BOM and reference drawings where available.
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