Diodes Incorporated AH1803-WG-7

Overview

AH1803-WG-7 from Diodes Incorporated is a micropower, ultra-sensitive Hall effect switch IC with dual Hall plates and CMOS output driver, designed for battery-powered portable electronics. It operates from 2.4–5.5 V, consumes only 8–27 µA average supply current at 3 V, features ±3 mT magnetic operate points (Bop), and delivers 0.1 V low-side output saturation voltage at 1 mA load - enabling reliable detection in cellular phone flip covers and PDA lid sensors.

For engineers reviewing the AH1803-WG-7 datasheet, AH1803-WG-7 pinout, AH1803-WG-7 application, or AH1803-WG-7 equivalent, key selection criteria include ultra-low power consumption (≤27 µA avg), bipolar magnetic sensitivity (±2–4 mT), chopper-stabilized offset cancellation, -40°C to +85°C operation, and SC59 (SOT23) package compatibility with handheld device PCB space constraints.

Technical Context

The AH1803 employs chopper-stabilized architecture to cancel Hall plate offset drift, achieving <1 mT hysteresis (Bhy) and minimal temperature-dependent switch-point variation. Its dual Hall plates enable true bipolar operation - either north or south pole activates the output when oriented toward the branded side of the package.

Internal logic includes a sampled latch with 75–150 µs wake-up time and 75–150 ms sampling period, ensuring stable output state after initial power-on. The CMOS push-pull output drives low (≤0.1 V) when active and high-impedance when inactive, eliminating external pull-up requirements in most implementations.

Key Specifications

Pinout & Package

Package: SC59 (commonly known as SOT23 in Asia), 3-pin, low-profile surface-mount package with 2.8 mm × 1.6 mm footprint and 0.95 mm height - optimized for space-constrained mobile PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AH1806-WG-7 and HAL1505D, the AH1803-WG-7 offers the lowest power envelope (≤27 µA) and true bipolar operation in the smallest footprint (SC59), making it optimal for modern compact, battery-sensitive designs where magnet orientation cannot be controlled during assembly.

Availability

AH1803-WG-7 is available at Aetrix Electronics and suitable for cellular phone flip cover detection, PDA lid sensing, cordless phone cradle presence verification, and wireless headset charging case lid monitoring requiring stable component supply and long-term lifecycle support.

Supply support for AH1803-WG-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, low-power, and green-compliant components for consumer, computing, and industrial markets.

The AH1803 belongs to Diodes' micropower Hall effect switch product line, engineered specifically for ultra-low-current magnetic sensing in battery-operated portable electronics - prioritizing sensitivity, stability, and small-form-factor integration.

FAQ

What is the magnetic polarity requirement for AH1803-WG-7 operation?

The AH1803-WG-7 responds to both north and south magnetic poles applied to the branded side of the package. Its bipolar design allows activation at ±2–4 mT, eliminating the need to control magnet orientation during assembly - a key advantage over unipolar Hall switches in high-volume consumer device manufacturing.

Does AH1803-WG-7 require an external capacitor?

Yes - a 10 nF to 100 nF ceramic decoupling capacitor between Vdd and GND is recommended per the datasheet to stabilize the supply and improve RF noise immunity. This capacitor mitigates transient disturbances from nearby RF circuits (e.g., cellular transceivers) that could otherwise cause false output toggling.

Is AH1803-WG-7 pin-compatible with AH1806-WG-7?

Yes - AH1803-WG-7 and AH1806-WG-7 share identical SC59 package dimensions, pin assignments (Vdd, GND, Output), and electrical interface. They differ only in magnetic thresholds (AH1806 has higher Bop/Brp) and hysteresis, allowing direct substitution where sensitivity requirements permit.

Why is AH1803-WG-7 marked "NRND" (Not Recommended for New Design)?

Diodes Incorporated classifies AH1803-WG-7 as NRND due to newer-generation alternatives (e.g., AH1807 series) offering enhanced ESD robustness and tighter magnetic tolerances. However, AH1803 remains fully manufactured, stocked, and supported - ideal for cost-sensitive, high-volume legacy designs where its 24 µW power and ±3 mT sensitivity meet functional requirements.