SEQURE Blueson A1 8S 70A AM32 4-in-1 ESC

The SEQURE Blueson A1 70A is a heavy-duty 4-in-1 ESC engineered for demanding high-voltage FPV builds, including X-Class rigs, cinelifters, macro quads, and heavy payload long-range platforms. Built around a 32-bit ARM MCU running open-source AM32 firmware, it delivers precise throttle response, ultra-fast commutation at up to 128 kHz PWM frequencies, and robust hardware protection for setups running on up to 8S LiPo power.

Key features

• AM32 open-source firmware: Features 128 kHz high-frequency PWM switching, advanced bidirectional DShot support, and sinusoidal startup for exceptionally smooth motor control.

• High-voltage power delivery: Rated for continuous 70 A per motor across a wide 2–8S LiPo voltage input, with high-transient MOSFETs handling high-torque motor loads without desyncs.

• Standard 30.5x30.5 mm mounting: Fits standard full-size drone frames and stacks easily with modern flight controllers via standard 8-pin wiring harnesses.

• Onboard telemetry & current sensor: Provides accurate real-time current draw monitoring and ESC telemetry data direct to your flight controller for OSD alerts and log analysis.

• Thermal and voltage protection: Engineered with optimised copper PCB layers and heat dissipation features to maintain thermal stability under high continuous current draw.

Specifications

• Continuous current: 70 A x 4

• Peak current (10s): 80 A x 4

• Input voltage: 2–8S LiPo

• Firmware: AM32 (Custom / Sequre target)

• Protocol support: DShot150, DShot300, DShot600, Bidirectional DShot, PWM, Oneshot, Multishot

• Mounting pattern: 30.5x30.5 mm (M3 holes)

• Dimensions: 44 x 43 mm

• Weight: 15.5 g

This ESC is suited for 7-inch to 10-inch long-range builds and heavy-lift cinelifters running large stator motors on 6S or 8S packs where standard 50 A boards risk thermal throttling. Ensure adequate airflow across the MOSFETs during sustained high-throttle climbs.