Diodes Incorporated AH1802-FY4G-7

Overview

AH1802-FY4G-7 from Diodes Incorporated is a micropower, ultra-sensitive omnipolar Hall-effect sensor switch in X2-DFN2015-3 package, operating from 2.5V to 5.5V with 24µW typical power at 3V, 28G typical operate point (Bop), and -40°C to +85°C temperature range-designed for contactless open/close detection in flip phones and smart covers.

For engineers reviewing the AH1802-FY4G-7 datasheet, AH1802-FY4G-7 pinout, AH1802-FY4G-7 application, or AH1802-FY4G-7 equivalent, this device delivers verified magnetic sensitivity, chopper-stabilized thermal stability, open-drain switching behavior, low sleep current (5–18µA), and ESD robustness (>6kV) critical for portable electronics design validation.

Technical Context

The AH1802 employs dual Hall plates with chopper-stabilized architecture to cancel offset drift and suppress stress-induced errors, enabling stable switching across temperature and supply voltage variations. Its internal latch and sleep/awake logic cycle every 75–150ms, with 75–150µs awake time per sampling window.

Magnetic actuation is omnidirectional: output pulls low when B > |Bop| (±20–40G) and releases when B < |Brp| (±10–20G), delivering 5–8G hysteresis. The single open-drain output supports external pull-up up to 5.5V and sinks ≥1mA at 0.3V max VOL.

Key Specifications

Pinout & Package

Package: X2-DFN2015-3 (1.5mm × 2.0mm × 0.4mm, 3-pin, no lead, RoHS/Green compliant). Pin 1 = VDD, Pin 2 = OUTPUT, Pin 3 = GND. All pins are on one side; no NC pins. Compatible with standard reflow profiles and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar omnipolar Hall-effect switch applications.

Compared with AL3320E-7 and TMAG5170AHQDBVR, the AH1802-FY4G-7 offers optimal balance of sensitivity (28G), micropower operation (8–23µA avg), and simplicity (single open-drain output) for cost-sensitive, space-constrained consumer cover-detection use cases.

Availability

AH1802-FY4G-7 is available at Aetrix Electronics and suitable for flip phone hinge detection, smart cover sensing, ultrabook lid switching, and digital camera power toggle applications requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for AH1802-FY4G-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, energy-efficient components for consumer, computing, and industrial markets.

The AH1802 belongs to Diodes' Hall-effect sensor switch product line, engineered specifically for ultra-low-power, contactless position sensing in portable electronics where size, battery life, and magnetic robustness are critical.

FAQ

What is the magnetic polarity requirement for AH1802-FY4G-7 actuation?

The AH1802-FY4G-7 is omnipolar: it activates with either a north or south magnetic pole presented perpendicular to the marked surface. Minimum field strength is 20–40 Gauss depending on temperature and supply voltage; release occurs at 10–20 Gauss with 5–8 Gauss hysteresis. No magnet orientation alignment is needed during mechanical integration.

Can AH1802-FY4G-7 drive an LED directly?

No. The AH1802-FY4G-7 has an open-drain output rated for ≤1mA sink current at 0.3V max VOL. Driving even a low-current LED (typically 2–5mA) would exceed its capability and cause improper saturation. It must interface through a transistor or dedicated LED driver IC, or use an external pull-up to a higher voltage with current-limiting resistor for indicator use.

Is AH1802-FY4G-7 pin-compatible with other AH18xx variants?

No. AH1802-FY4G-7 uses X2-DFN2015-3 (3-pin), while AH1802-WG-7 uses SC59 (3-pin but different footprint), and AH1802-SNG-7 uses U-DFN2020-6 (6-pin, with NC pins). Though functional equivalence exists across the AH1802 family, package dimensions, pin assignments, and solder pad layouts differ - requiring PCB redesign for substitution.

Does AH1802-FY4G-7 require external capacitors?

Yes. A 100nF ceramic decoupling capacitor is required between VDD and GND, placed within 2mm of the device pins. This stabilizes internal regulation during magnetic sampling cycles and suppresses supply transients induced by nearby RF sources or switching regulators - omission risks erratic output behavior or increased current consumption.