2–8S power-system integration
Specified for LiPo battery configurations from 2S to 8S. Battery and motor compatibility must be evaluated at the complete system level.
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.
The UESC-70-8S-4I-A is a 70A 8S 4-in-1 ESC for FPV and UAV system integrators. It combines four motor-control channels with a 2–8S LiPo input range, an eight-layer 3oz copper PCB and an STM32G071-based control platform. Multiple throttle protocols support integration with compatible flight controllers. UltroNiu supports finished ESC sourcing and separate OEM PCB/PCBA projects.
70AContinuous current rating
75APeak current rating
2–8SLiPo battery input
4-in-1Four motor-control channels
8L / 3ozHeavy-copper PCB
DShot600Supported digital throttle protocol
Product Engineering
Four motor channels in a single 8S ESC power stage
The 70A 8S 4-in-1 ESC consolidates four brushless motor-control channels into one power electronics assembly. Its 2–8S LiPo input range and throttle-protocol support provide a defined starting point for matching an ESC with a flight controller, motors and battery system.
For OEM evaluation, the key selection factors are operating current, mounting and wiring fit, power-stage cooling, and controller compatibility—not the current rating alone.
System selection: Review motor load, supply transients, airflow, mounting envelope and signal pinout as part of the complete aircraft design.
Engineering Features
What matters during ESC selection
70A continuous / 75A peak
Published current ratings identify the product class. Actual usable current depends on cooling, wiring, installation and the applied load profile.
Eight-layer 3oz PCB
Heavy-copper multilayer construction provides the basis for current-path routing and thermal spreading across the power stage.
STM32G071 control
STM32G071-based motor control and an AT4G_Multi_32.9.Hex firmware reference define the listed controller platform.
Flexible throttle interfaces
PWM, Oneshot125, Oneshot42, Multishot and DShot150/300/600 support integration with compatible FC outputs.
OEM supply pathway
Source the specified ESC or discuss separate board-level PCB fabrication and PCBA services for a customer-defined platform.
Technical Data
UESC-70-8S-4I-A specifications
| Parameter | Specification |
|---|---|
| Model | UESC-70-8S-4I-A |
| Product type | 4-in-1 electronic speed controller |
| Battery input | 2–8S LiPo |
| Continuous current | 70A (published rating) |
| Peak current | 75A (published rating) |
| Motor channels | 4 |
| Controller | STM32G071 |
| Firmware reference | AT4G_Multi_32.9.Hex |
| PCB | 8 layers / 3oz copper |
| MOSFET rating | 40V device class |
| Gate driver | FD6288Q |
| Throttle protocols | PWM, Oneshot125, Oneshot42, Multishot, DShot150, DShot300, DShot600 |
| Listed net weight | 11g |
| Listed packaging weight | 52g |
| Listed package dimensions | 64 × 64 × 35mm |
Current and weight figures are published specifications. Continuous-load and peak-duration limits are installation-dependent; detailed test conditions are not included in this summary.
Power Electronics
Power-stage design: current paths, switching and heat
The specified eight-layer PCB uses 3oz copper and a layout intended for compact high-current switching. The design lists 40V-class MOSFETs, an FD6288Q gate driver, an industrial-grade LDO and Murata capacitors.
At 8S, nominal battery voltage does not describe every transient seen by a switching power stage. Cable inductance, deceleration behavior, input capacitance and layout affect voltage stress and should be addressed in the target build.
PCB copper and component selection help establish the electrical architecture; they are not substitutes for thermal and transient validation under the final load conditions.
Control & Integration
Flight-controller protocols and motor response
Controller platform
STM32G071 microcontroller with a listed AT4G_Multi_32.9.Hex firmware build reference.
Signal interfaces
PWM, Oneshot125, Oneshot42, Multishot and DShot150/300/600 for compatible FC signal outputs.
Motor-control functions
Hardware PWM, Damped Light braking and active freewheeling are described for this ESC configuration.
Verify the flight-controller harness, signal mapping and firmware configuration before powering a complete stack.
Applications
Built for quad-motor UAV integration
FPV and UAV platforms
The four-channel format is relevant to quad-motor FPV and UAV designs that use compatible 2–8S battery systems and require a 70A-class ESC.
OEM platform evaluation
Integration teams can assess the ESC against the selected motor set, airframe cooling, electrical interfaces, packaging envelope and procurement quantities.
Engineering handoff
For custom PCBA projects, share the controller interface, target battery and motor configuration, PCB constraints and production requirements to scope the build.
PCB Fabrication
Heavy-copper multilayer PCB manufacturing
For high-current ESC hardware, fabrication planning must consider layer registration, copper geometry, interlayer connections, solder-mask clearances and exposed power pads. These controls support consistent board production but do not, by themselves, demonstrate a specific ESC current or thermal rating.
PCBA & Inspection
Assembly and quality controls for power electronics
Dense MOSFET placement and high-current joints make assembly quality especially important. A manufacturing plan can combine component traceability, solder-process controls, optical inspection and project-specific electrical or functional checks.
01 / PCBLayer build and board-level electrical inspection
02 / AssemblyPower and controller component placement
03 / InspectionVisual or automated assembly inspection
04 / ValidationApplication-specific test plan and acceptance criteria
OEM / ODM
Standard ESC supply or a project-specific hardware build
Standard model sourcing
Discuss supply of UESC-70-8S-4I-A for qualified UAV integration programs and expected purchase volumes.
Custom PCB manufacturing
Scope multilayer stack-up, copper architecture, pad design and fabrication needs for a customer-owned ESC design.
PCBA and production support
Review BOM, component procurement, assembly, inspection and acceptance requirements for a separate OEM project.
Discuss an ESC engineering project or send your requirements by email.
Frequently Asked Questions
70A 8S 4-in-1 ESC FAQ
What battery input does the UESC-70-8S-4I-A support?
The specified input range is 2–8S LiPo. System integration should account for wiring, motor loading and voltage transients.
What are the continuous and peak current ratings?
The published ratings are 70A continuous and 75A peak. The available information does not specify the peak-duration test window or full thermal test conditions.
Which throttle protocols are supported?
PWM, Oneshot125, Oneshot42, Multishot, DShot150, DShot300 and DShot600 are listed. Confirm signal connections and firmware configuration with your flight controller.
Which controller and firmware does it use?
The specified controller is STM32G071, with AT4G_Multi_32.9.Hex listed as the firmware reference.
What PCB construction is specified?
The product information lists an eight-layer PCB with 3oz copper. Actual current capacity also depends on copper geometry, assembly and thermal conditions.
Does it include a flight controller?
The 4-in-1 ESC is a motor-control power board. A compatible flight controller is a separate part of the UAV system unless a particular supply quotation specifies otherwise.
Can UltroNiu support OEM ESC and PCBA projects?
Yes. UltroNiu supports discussions for standard product supply and separate customer-defined PCB fabrication, PCBA and production requirements.
PROJECT INQUIRY
Source the 70A ESC or review an OEM design
Send your target battery configuration, motor current profile, flight-controller interface and expected order volume. Our team can review product sourcing or a separate PCB/PCBA manufacturing scope.
Request Engineering ReviewEmail an InquiryRelated model: 55A 8S 4-in-1 ESC · Explore a lower-current four-channel option.
Related Products
55A 8S 4-in-1 ESC
2–8S LiPo, 55A continuous / 60A peak, 30.5mm mounting, 6-layer 3oz copper PCB and four motor-control channels.
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