Diodes Incorporated AH8503-FDC-7

Overview

AH8503-FDC-7 from Diodes Incorporated is a high-accuracy, micropower linear Hall-effect sensor with 8-bit output resolution, ratiometric analog voltage output proportional to perpendicular magnetic flux density, ±400G sensing range, and trim accuracy of ±3% at +25°C. It operates from 1.6V to 3.6V and delivers 2.25mV/G sensitivity at 1.8V for precision position detection in battery-powered consumer and industrial systems.

For engineers reviewing the AH8503-FDC-7 datasheet, AH8503-FDC-7 pinout, AH8503-FDC-7 application, or AH8503-FDC-7 equivalent, key selection criteria include micropower mode current (13µA), turbo mode sampling rate (6.25kHz), CNTRL-pin–driven external sampling up to 7.14kHz, input-referred noise (0.36G at 1.8V), and U-DFN2020-6 (Type C) package compatibility with space-constrained PCB layouts.

Technical Context

The AH8503 integrates a chopper-stabilized Hall plate, 8-bit ADC/DAC, oscillator-based timing control, and mode-select logic driven by the CNTRL pin. Its architecture enables three distinct operating modes-micropower (24Hz), turbo (6.25kHz continuous), and externally clocked (24Hz–7.14kHz)-with dynamic current scaling between 13µA and 1.16mA.

Output voltage is ratiometric to VDD and centered at VDD/2 under zero-field conditions, with offset voltage controlled to ±1% of VDD. The device maintains output voltage during sleep states and achieves ±3% sensitivity accuracy across temperature via factory trimming and chopper stabilization, minimizing thermal drift and mechanical stress effects.

Key Specifications

Pinout & Package

Package: U-DFN2020-6 (Type C), 2.0mm × 2.0mm × 0.55mm, exposed pad (no internal connection).

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-000-RE, the AH8503-FDC-7 uniquely balances ultra-low quiescent current (13µA), wide 1.6–3.6V supply range, and configurable sampling-all in a 2mm × 2mm package-making it optimal for space- and energy-constrained consumer and industrial analog-sensing nodes.

Availability

AH8503-FDC-7 is available at Aetrix Electronics and suitable for battery-powered consumer electronics, industrial position monitoring, and home appliance sensing applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AH8503-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 solutions for power management, signal integrity, and sensing applications.

The AH8503 belongs to Diodes' high-accuracy linear Hall-effect sensor product line, designed specifically for low-power, high-fidelity magnetic position and proximity detection in cost-sensitive, space-constrained systems.

FAQ

What is the minimum pulse width required on the CNTRL pin to initiate a conversion cycle?

The minimum pulse width on the CNTRL pin to start one sample/conversion cycle is 20µs typical across the full operating temperature range (−40°C to +85°C). Diodes recommends using a minimum pulse width of 40µs to ensure reliable triggering under all conditions, including voltage and process variation. This timing applies exclusively to external-drive mode and does not affect micropower or turbo mode operation.

Does the AH8503-FDC-7 require an external decoupling capacitor, and if so, what value is recommended?

Yes, a 100nF ceramic capacitor is required between VDD and GND, placed as close as possible to the VDD pin. This capacitor stabilizes the internal reference and improves noise immunity during sampling, especially critical in turbo and external-drive modes where rapid current transients occur. Omitting it may cause output instability or increased noise, particularly in electrically noisy environments such as motor-driven appliances.

How does the output voltage behave during sleep periods in external-drive mode?

In external-drive mode, the AH8503 maintains its last valid output voltage during sleep periods-no output collapse or reset occurs. The device holds the DAC output steady while consuming only 8.93µA typical at 1.8V, enabling seamless wake-up without reinitialization delay. This behavior ensures continuous analog monitoring in systems where output continuity is required between samples, such as closed-loop position controllers.

Is the exposed pad of the U-DFN2020-6 (Type C) package electrically connected internally?

No, the center exposed pad has no internal electrical connection. It is mechanically part of the package for thermal and mechanical stability only. The pad may be left unconnected or tied to the PCB ground plane to improve thermal dissipation and mounting reliability-neither choice affects electrical performance. Diodes explicitly states this in the datasheet pin description and recommends grounding it for best thermal management in high-duty-cycle applications.