85A 4-in-1 BLHeli_32 ESC for FPV Drone

Name: 85A 4-in-1 BLHeli_32 ESC for FPV Drone
SKU: 38682
Price: 49.99 USD
Availability: InStock

High-performance 4-in-1 electronic speed controller utilizing the AT32F421K8U7 ARM Cortex-M4 MCU.

Designed by ChatRobotic FPV Drones in China

85A 4-in-1 BLHeli_32 ESC for FPV Drone 1

85A 4-in-1 BLHeli_32 ESC for FPV Drone 2

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High-performance 4-in-1 electronic speed controller utilizing the AT32F421K8U7 ARM Cortex-M4 MCU.

85A 4-in-1 ESC (AT32F421K8U7) Technical Brief Overview High-performance 4-in-1 electronic speed controller utilizing the AT32F421K8U7 ARM Cortex-M4 MCU, designed for 5-8S FPV drones requiring ultra-f…

85A 4-in-1 ESC (AT32F421K8U7) Technical Brief

Overview

High-performance 4-in-1 electronic speed controller utilizing the AT32F421K8U7 ARM Cortex-M4 MCU, designed for 5-8S FPV drones requiring ultra-fast response and robust power delivery.

1. Core Specifications

Parameter	Specification
MCU	AT32F421K8U7 (120MHz Cortex-M4)
Continuous Current	85A/channel (4-in-1 total 340A)
Instantaneous Current	110A/channel (10sec)
Input Voltage	3S-8S (12.6-33.2V)
PWM Frequency	8-48kHz (programmable)
Protocols	DShot150/300/600/Multishot/Oneshot/PWM
Dimensions	54×45×8mm
Board Weight	16g

2. Key Features

Power Stage

MOSFETs: 12× TPHR8504PL (0.7mΩ Rds(on))
Capacitance:
30× 22μF 35V ceramic capacitors
1× 1000μF 50V electrolytic capacitor
Power Supply: Quad-isolated LDO design
Current Sensing: High-precision (±1% error)

Control System

MCU Performance:
120MHz clock speed
Single-cycle 32-bit multiplier
Hardware FPU
Update Rate: 32kHz signal processing
Response Latency: <5μs

Protections

Overcurrent (Hardware + Software)
Overtemperature (Throttle derating @85°C)
Voltage spike protection (40V transient)
Motor short-circuit detection

3. Firmware Details

Feature	Implementation
Base Firmware	AM32_AORC_K_A_F421_2.16.hex
Startup Time	<0.5s (Power-on to Ready)
Motor Compatibility	700KV - 3000KV
Telemetry	Bi-Directional DShot (RPM/Voltage)
Tuning	ESC-Configurator / Betaflight Passthrough

4. Accessories Package

1× 1000μF 50V electrolytic capacitor
4× M3×8mm shock-absorbing balls
1× XT60 male 12AWG silicone cable (15cm)
1× SH1.0-8pin reverse silicone cable (10cm)

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II. Shipping and Delivery

ChatRobotic will arrange shipping based on the order priority and inventory situation after receiving the full payment from the customer. The estimated shipping date will be informed to the customer in the order confirmation notice. However, due to force majeure or other unforeseeable and unavoidable reasons, the shipping time may be delayed, and the company will promptly notify the customer and provide a reasonable explanation.
The company will select appropriate logistics partners for product delivery, and the delivery scope covers most regions around the world. The delivery cost will be calculated based on factors such as the customer's shipping address, the weight, and volume of the order, and will be clearly shown in the order confirmation notice. Customers can choose different delivery service levels when placing an order, such as standard delivery or expedited delivery. The corresponding delivery costs and delivery times will vary accordingly.
After the product is shipped, ChatRobotic will provide logistics tracking information to the customer so that the customer can check the transportation status of the product at any time. When receiving the product, the customer should carefully check whether the packaging of the product is intact. In case of any damage or abnormality, the customer should promptly contact the logistics company and notify ChatRobotic.