Diodes Incorporated AH8501-FDC-7

Overview

AH8501-FDC-7 from Diodes Incorporated is a high-accuracy, micropower linear Hall effect sensor with 8-bit output resolution, ratiometric voltage output proportional to perpendicular magnetic flux density, ±400G sensing range, and trim-specified sensitivity of 2.25mV/G at 1.8V (±3% accuracy at +25°C). It operates from 1.6V–3.6V and supports three power modes-sleep (8.9µA), auto-run (6.25kHz), and external-drive (up to 7.14kHz)-enabling precise position detection in battery-powered consumer and industrial equipment.

For engineers reviewing the AH8501-FDC-7 datasheet, AH8501-FDC-7 pinout, AH8501-FDC-7 application, or AH8501-FDC-7 equivalent, key selection criteria include its micropower sleep current, ENABLE-controlled sampling flexibility, 0.36G rms input-referred noise at 1.8V, 3.125G/LSB magnetic resolution, and U-DFN2020-6 footprint for space-constrained PCBs.

Technical Context

The AH8501 integrates a chopper-stabilized Hall element, 8-bit ADC/DAC, and programmable ENABLE-driven timing control. Its output maintains VDD/2 null voltage at zero gauss and exhibits symmetrical positive/negative linearity (≥99.7%) across the full ±400G range. The device uses internal trimming to achieve ±3% sensitivity accuracy at +25°C and <±6% over −40°C to +85°C.

Operating modes are determined solely by the ENABLE pin state: continuous low (sleep), continuous high (auto-run at 6.25kHz), or externally pulsed (external drive up to 7.14kHz). Each conversion cycle requires ≥140µs awake time and ≥20µs minimum ENABLE pulse width, with output updated within 10µs after acquisition completion.

Key Specifications

Pinout & Package

Package: U-DFN2020-6 (2.0mm × 2.0mm × 0.55mm, 0.5mm pitch), thermally enhanced with exposed center pad (unconnected or tied to GND).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear Hall effect sensor applications.

Compared with A1302LLHLT-T and MLX90242ESE-GAA-100-SP, the AH8501-FDC-7 uniquely balances micropower analog operation (8.9µA sleep), wide supply range (1.6–3.6V), and factory-trimmed accuracy-making it optimal for compact, battery-powered systems requiring direct voltage interfacing without digital protocol overhead.

Availability

AH8501-FDC-7 is available at Aetrix Electronics and suitable for battery-powered consumer electronics, home appliance position sensing, and industrial proximity monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AH8501-FDC-7 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and sensing applications.

The AH8501 belongs to Diodes' linear Hall effect sensor product line, designed specifically for high-accuracy, ultra-low-power position and proximity detection in space- and energy-constrained systems.

FAQ

What is the minimum ENABLE pulse width required to initiate a conversion cycle?

The AH8501-FDC-7 requires a minimum ENABLE pulse width of 20µs to trigger one sample/conversion cycle, with a recommended minimum of 40µs to ensure robust timing margin across voltage and temperature. This pulse initiates a 140µs awake period during which magnetic sampling and ADC conversion occur before output update.

How does the ratiometric output benefit system design?

The ratiometric output (VOUT ∝ VDD) means the output voltage scales directly with supply voltage, eliminating errors caused by VDD tolerance or droop. This allows accurate position measurement without precision voltage references or supply monitoring, simplifying analog front-end design in battery-powered systems where supply varies over discharge cycles.

Can the NC pins (2 and 6) be connected to ground?

Yes, pins 2 and 6 are designated "No Connection" with no internal bond wire or silicon connection. They may be left floating or tied to GND on the PCB for mechanical reinforcement or thermal dissipation-neither choice affects electrical performance or reliability.

What is the impact of the 8-bit resolution on magnetic measurement precision?

With 8-bit resolution and ±400G full-scale range, the AH8501-FDC-7 provides 3.125G/LSB granularity at 1.8V. This enables detection of small magnetic field changes-e.g., 1mm magnet displacement in typical configurations-while maintaining low noise floor (0.36G rms) for stable DC readings without excessive oversampling.