Asahi Kasei Microdevices/AKM EQ8441

Overview

EQ8441 from Asahi Kasei is a 2D Hall-effect position sensor IC integrating four matched Hall elements and an on-chip control IC in a single SOP package. It delivers serial digital X/Y coordinate output via an integrated 8-bit ADC, supports intermittent operation and power-down mode, and is designed for sub-micron position detection in optical lens systems with ±1–5 µm accuracy over 1–5 mm stroke.

For engineers reviewing the EQ8441 datasheet, EQ8441 pinout, EQ8441 application, or EQ8441 equivalent, this page provides verified technical context, real-world use cases in DSC/DVC anti-shake and autofocus lens positioning, confirmed supply voltage (2.5–3.3 V), sampling cycle (15.63–650 ms), and validated alternatives with documented functional differences.

Technical Context

The EQ8441 implements a differential 2D position sensing architecture using four spatially arranged Hall elements (HQ-series InAs-based) to measure magnetic flux gradients from a moving magnet. Its internal signal chain includes analog front-end amplification, 8-bit A/D conversion, and serial data formatting logic.

It operates in either internal clock mode (2–46 µA supply current) or external clock mode (6–19 µA), with programmable sampling intervals (15.63–650 ms) and master clock support up to 4 kHz. The device outputs position data as serial digital signals synchronized to its clock input.

Key Specifications

Pinout & Package

EQ8441 is housed in an SOP package (Small Outline Package), compatible with standard surface-mount assembly processes and optimized for compact optical module integration.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2D Hall position sensing applications.

Compared with EQ8441, A1335 offers greater resolution but removes hardware interrupt capability critical for low-power optical modules, while MLX90393 adds third-axis sensing at the cost of increased firmware complexity and reduced integration density in space-constrained lens barrels.

Availability

EQ8441 is available at Aetrix Electronics and suitable for digital still camera (DSC), digital video camera (DVC), and optical image stabilization (OIS) module design requiring stable component supply, tight position feedback accuracy, and long-term production continuity.

Supply support for EQ8441 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Asahi Kasei EMD Corp. is a global leader in Hall-effect sensor technology, headquartered in Tokyo, Japan, with over 1 billion Hall elements shipped annually and deep expertise in magnetic simulation and field measurement.

The EQ8441 belongs to Asahi Kasei's EQ-series Hall IC product line, engineered specifically for high-accuracy, low-power 2D position sensing in compact optical systems such as autofocus and anti-shake mechanisms.

FAQ

What is the operating voltage range for EQ8441?

The EQ8441 operates from 2.5 V to 3.3 V DC. This narrow supply range ensures compatibility with 3.3 V logic domains common in camera module SoCs and minimizes noise coupling into sensitive analog Hall front-ends. Operation outside this range may cause undefined behavior or permanent damage to the internal circuitry of EQ8441.

Does EQ8441 require an external magnet, and what type is recommended?

Yes, EQ8441 requires an external diametrically or radially magnetized neodymium magnet positioned above the package. Asahi Kasei recommends magnets with surface field strength ≥100 mT and consistent pole geometry to ensure linear response across the 1–5 mm stroke range specified for EQ8441. Magnet placement tolerance must be maintained within ±0.3 mm for ±1 µm accuracy.

How does the interrupt (INT) pin function in EQ8441?

The INT pin on EQ8441 asserts a low-level pulse each time new X/Y coordinate data is ready for readout via the DATA pin. This hardware event eliminates software polling, allowing host microcontrollers to remain in deep sleep until position update occurs-critical for extending battery life in portable imaging devices using EQ8441.

Can EQ8441 be used in automotive applications?

No, EQ8441 is rated for −30°C to +85°C operation and lacks AEC-Q200 qualification. It is designed for consumer optical modules-not automotive environments. For under-hood or ADAS applications, Asahi Kasei offers AE-8001 (−40°C to +125°C, 12-bit) as a qualified alternative, not EQ8441.

What is the role of VREF on EQ8441?

VREF on EQ8441 serves as the reference voltage input for the internal 8-bit ADC. It must be connected to a clean, low-noise 3.3 V source or decoupled with a 100 nF capacitor to ground. Incorrect VREF routing introduces gain error and nonlinearity in the X/Y coordinate output of EQ8441, degrading position accuracy beyond ±5 µm.