Diodes Incorporated AH1808-P-B

Overview

AH1808-P-B from Diodes Incorporated is a high-sensitivity, micropower omnipolar Hall-effect switch IC in SIP-3 (Bulk Pack) package. It operates from 2.5V to 5.5V, consumes only 5–10 µA in sleep mode at 3V, and switches its open-drain output on with either North or South magnetic pole. Used for magnetic-tamper detection in smart meters and contactless position sensing in battery-powered appliances.

For engineers reviewing the AH1808-P-B datasheet, AH1808-P-B pinout, AH1808-P-B application, or AH1808-P-B equivalent, key selection criteria include operate/release flux density (±20–60 Gauss), chopper-stabilized temperature stability, 6 kV HBM ESD rating, -40°C to +85°C operation, and SIP-3 mechanical compatibility with through-hole mounting.

Technical Context

The AH1808 employs dual Hall plates and chopper stabilization to cancel offset drift and achieve ±10 Gauss hysteresis over -40°C to +85°C. Its sleep/awake duty cycle (0.1% typical) enables ultra-low average current (8–16 µA at 3V), critical for multi-year battery life.

Magnetic switching is polarity-agnostic: B_op = ±20–60 Gauss and B_rp = ±10–50 Gauss define turn-on/turn-off thresholds. The single open-drain output sinks up to 2.5 mA and requires external pull-up (10–100 kΩ); V_{OUT_ON} is ≤0.3 V at 1 mA load.

Key Specifications

Pinout & Package

SIP-3 (Bulk Pack) is a 3-pin straight-lead through-hole package (14.5 mm length, 3.0 mm width, 1.5 mm height) with 2.54 mm pin pitch. Pin 1 = VDD, Pin 2 = GND, Pin 3 = OUTPUT - no NC pins; all terminals electrically active.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A3212LLHLT-T and US1881EUA-ABA-000-REEL, AH1808-P-B offers optimal balance of SIP-3 mechanical compatibility, 6 kV ESD robustness, and production-ready bulk-pack logistics - ideal for high-volume appliance and meter OEMs requiring drop-in replacement and supply chain continuity.

Availability

AH1808-P-B is available at Aetrix Electronics and suitable for smart meter tamper detection, portable display lid switches, coffee machine liquid level sensing, and industrial equipment cover interlocks requiring stable component supply across multi-year production cycles.

Supply support for AH1808-P-B 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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and Malaysia.

The AH1808 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ultra-low-power, contactless position and proximity detection in battery-operated and energy-conscious industrial systems.

FAQ

What is the maximum magnetic flux density the AH1808-P-B can withstand without damage?

The AH1808-P-B has no absolute maximum magnetic rating - its magnetic characteristics are specified up to ±60 Gauss for reliable switching, but exposure to fields beyond this range does not cause permanent damage. The device remains functional under strong static fields, though output behavior may saturate outside the guaranteed B_op/B_rp window.

Can AH1808-P-B drive an LED directly without a transistor?

No. The AH1808-P-B's open-drain output sinks only 2.5 mA maximum at V_OUT ≤ 0.3 V. Standard LEDs require 5–20 mA for visible brightness; direct drive would result in dim or non-functional illumination. A small-signal NPN transistor or MOSFET is required for LED loads.

Is the SIP-3 (Bulk Pack) variant compatible with wave soldering processes?

Yes. The SIP-3 (Bulk Pack) package is rated for standard wave soldering profiles per J-STD-020. Peak temperature must not exceed 260°C for ≤10 seconds, and thermal shock must stay within Diodes' qualified limits. Lead coplanarity and solder wettability are validated for automated through-hole assembly.

Does AH1808-P-B require an external capacitor on VDD?

Yes. A 10–100 nF ceramic decoupling capacitor is mandatory between VDD and GND, placed as close as possible to the SIP-3 pins. This stabilizes the internal regulator, suppresses supply noise, and improves RF immunity - omission causes erratic switching or increased sleep current.