Product Overview
SourcingProChina is a sourcing agent based in China, specializing in helping overseas drone brands, resellers, and system integrators identify and work with qualified manufacturers of FC-ESC stacks and All-In-One (AIO) boards. Rather than manufacturing in-house, we act as your on-the-ground procurement team: shortlisting factories that produce compliant stacked or AIO flight-controller/ESC systems, coordinating specification confirmation, arranging samples, and managing quality inspection before shipment.
The stacks and AIO boards we source combine flight controller MCUs (STM32F405, F722, or H743) with matched ESCs (40A to 90A continuous) and ICM42688P gyroscopes — configurations commonly requested by buyers building 2- to 17-inch drone platforms. If your team lacks the time or local relationships to vet suppliers directly, we manage that process on your behalf, reducing sourcing risk and MOQ friction.
FAQ
Q1: What is the difference between a stack and an AIO?
A stack consists of separate FC and ESC boards that mount together using standoffs, offering more flexibility to swap components. An AIO (All-In-One) integrates both onto a single PCB, saving space and weight but reducing repairability — SourcingProChina can help you decide which format fits your target frame size and use case based on supplier availability.
Q2: What firmware do these stacks use?
FCs typically ship with BetaFlight (default), with INAV support available on request. ESCs use BLHeli_S, Bluejay, or AM32 firmware depending on the model. As your sourcing agent, we confirm firmware version and flashing status with the factory before shipment to avoid post-arrival surprises.
Q3: What is the mounting pattern for these stacks?
Stacks generally follow the standard 30.5×30.5mm pattern; the F702 AIO uses 25.5mm/26.5mm M2 mounting for compact builds. We verify this against your frame specification during the sourcing process.
Q4: Are these stacks compatible with DJI O3 Air Unit?
Select models include 6-Pin DJI Air Unit plugs, and certain AIO boards support Vista/O3 connections. Compatibility varies by supplier and batch — SourcingProChina confirms this directly with the factory for your specific order before production.
Q5: What is the maximum input voltage?
Most stacks support 3-8S (up to 33.6V); the F702 AIO supports 4-6S for cinewhoop applications. Voltage tolerance is confirmed against factory test reports as part of our QC coordination.
Q6: Can I use these stacks for fixed-wing drones?
The FCs can be configured for fixed-wing use with appropriate firmware (INAV/ArduPilot), though ESC design is generally optimized for multi-rotor applications. Buyers with fixed-wing requirements should flag this during inquiry so we can shortlist suppliers with relevant firmware support.
Q7: How does SourcingProChina's sourcing process work for FC-ESC stacks?
As a sourcing agent based in China, we take your specification (MCU type, ESC current rating, mounting pattern, frame size), shortlist verified factories, arrange samples, and coordinate quality inspection before bulk shipment — reducing your direct supplier risk. Submit an inquiry to start a specification review.
Q8: Do you offer factory audits before bulk orders?
Yes. SourcingProChina can arrange factory audits prior to placing bulk orders on FC-ESC stacks or AIO boards — a service particularly recommended for first-time buyers or larger order volumes.
