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Home > Products > Sensors, Transducers > Magnetic Sensors > Switches (Solid State)

Diodes Incorporated AH1806-P-A

Name: AH1806-P-A
Brand: Diodes Incorporated
SKU: AH1806-P-A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AH1806-P-A

Manufacturer:: Diodes Incorporated

Category:: Switches (Solid State)

Package:: 3-SIP

Datasheet:: AH1806-P-A.pdf

Description:: MAGNETIC SWITCH OMNIPOLAR 3SIP

Quantity:: RFQ Add To RFQ list

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Inventory:4,132

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Product details

Overview

AH1806-P-A from Diodes Incorporated is a high-sensitivity, micropower omnipolar Hall-effect switch IC designed for magnetic tamper detection in smart meters and position sensing in battery-powered consumer and industrial equipment. It operates from 2.5V to 5.5V, consumes only 24µW at 3V, features open-drain output, and switches on with either North or South pole magnetic fields exceeding ±15–45 Gauss B_op.

For engineers reviewing the AH1806-P-A datasheet, AH1806-P-A pinout, AH1806-P-A application, or AH1806-P-A equivalent, this device is selected for ultra-low-power contactless switching where magnetic polarity independence, thermal stability, and RF noise immunity are critical in portable, home appliance, and industrial embedded systems.

Technical Context

The AH1806 employs dual Hall plates and chopper-stabilized architecture to cancel offset drift and deliver stable switching thresholds across -40°C to +85°C. Its sleep/awake duty cycle (0.1% typical) enables average supply current as low as 8–16µA at 3V, supporting multi-year battery life in sealed devices.

It uses internal latch logic with hysteresis (5–10 Gauss) to prevent chatter near B_op/B_rp thresholds and integrates power-switching logic that guarantees valid output after two operating cycles (~150ms) following power-up within 2.5–5.5V range.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.5V to 5.5V - supports single-cell Li-ion, 3.3V/5V rails, and brown-out tolerant operation in battery-backed systems.
Typical Power Consumption	24µW at 3V - enables >10-year battery life in smart meter tamper detection with 1Hz sampling.
Omnipolar Switch Threshold	B_op = ±15–45 Gauss - activates with either magnetic pole orientation, simplifying mechanical design of magnetic actuator placement.
Output Type	Open-drain - allows flexible pull-up to any voltage ≤5.5V and wired-OR interfacing with microcontrollers or logic inputs.
Operating Temperature	-40°C to +85°C - qualified for outdoor smart meters, industrial enclosures, and home appliance control panels.
Hysteresis	5–10 Gauss - prevents false toggling due to magnetic field noise or slow-field transitions near threshold.
ESD Rating	HBM >6kV - ensures robustness during PCB handling and end-equipment assembly without additional protection circuitry.

Pinout & Package

Package: SIP-3 (Ammo Pack), 3-pin single-inline package with gull-wing leads; compact footprint (4.1mm × 3.0mm × 1.5mm), lead-free, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1 VDD	Power supply input	Accepts 2.5–5.5V; internal regulator powers analog front-end and digital logic; decoupling capacitor (10–100nF) required at pin.
2 GND	Ground reference	Common return path for Hall sensor, amplifier, and output driver; must be low-impedance connection to system ground plane.
3 OUTPUT	Open-drain output	Sinks up to 2.5mA when active (low); requires external pull-up resistor (10–100kΩ) to define logic-high level and interface voltage.

Key Features

Feature	Design Value
Omnipolar magnetic detection	Eliminates need for magnet polarity alignment during assembly-reduces manufacturing cost and improves field-replaceability in smart meters.
Chopper-stabilized architecture	Reduces temperature-induced B_op drift to <±0.5G/°C, enabling stable switching over full industrial temperature range without calibration.
Micropower sleep mode	IDD(sleep) ≤28µA across -40°C to +85°C - extends battery life in wireless sensors and portable displays where wake intervals are infrequent.
RF noise immunity	Validated against common ISM-band interference (e.g., 2.4GHz Wi-Fi/Bluetooth); no external filtering needed in noisy industrial environments.
Small SIP-3 package	Enables direct mounting on narrow PCB edges or inside tight enclosures (e.g., meter housings, PDA lids) without rework or adapter boards.

Applications

Smart Meter Tamper Detection

Portable Display Lid Switch

Use Scenario: Detect unauthorized opening of utility meter housing using embedded magnet and fixed Hall sensor.

IC Role / Device Role / Timing Role: Contactless switch providing tamper event signal to secure microcontroller via open-drain interrupt line.

Use Value: Omnipolar operation tolerates magnet misalignment during field installation; 24µW consumption enables decade-long CR2032 battery life.

Use Scenario: Auto-suspend/resume function in tablets and 2-in-1 laptops when lid closes or opens.

IC Role / Device Role / Timing Role: Low-latency magnetic presence detector triggering system sleep/wake state transition within 125µs.

Use Value: Chopper stabilization ensures reliable switching despite thermal cycling during daily use; SIP-3 fits edge-mount constraints.

Industrial Equipment Cover Interlock

Liquid Level Sensing in Appliance Tanks

Use Scenario: Safety interlock on service panels of HVAC units or PLC cabinets to disable power when cover is removed.

IC Role / Device Role / Timing Role: Fail-safe proximity monitor interfaced with safety-rated controller via isolated GPIO input.

Use Value: -40°C to +85°C rating ensures operation in unconditioned mechanical rooms; 6kV HBM ESD withstands factory handling.

Use Scenario: Non-invasive liquid level monitoring in washing machine or dishwasher detergent tanks using float-mounted magnet.

IC Role / Device Role / Timing Role: Position threshold detector generating discrete "low/medium/full" states based on magnet height.

Use Value: 10-Gauss hysteresis prevents oscillation during fluid slosh; 5.5V max output voltage allows direct interface with 5V MCU ADC reference.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ALLEGRO A3212ELHLT-T	Higher B_op (±35–70G), 5.5V max supply, but 45µW typical power at 3V - 88% higher quiescent consumption.	Targeted at automotive-grade applications; AEC-Q100 qualified but over-specified for consumer metering.	Select if AEC-Q100 compliance or wider B_op tolerance is required; avoid if battery life is primary constraint.
MELEXIS US1881EUA-ABA-000-RE	Lower sensitivity (B_op ±50–90G), 3.6V max supply, 12µA sleep current - but lacks chopper stabilization and has ±3G/°C B_op drift.	Designed for cost-sensitive consumer electronics; not recommended for temperature-variable industrial enclosures.	Choose only for room-temperature, short-lifecycle products where absolute lowest cost outweighs long-term reliability.

Compared with A3212ELHLT-T and US1881EUA-ABA-000-RE, the AH1806-P-A uniquely balances ultra-low power (24µW), tight thermal drift (<±0.5G/°C), and true omnipolar flexibility - making it optimal for battery-powered smart infrastructure where longevity and field robustness are non-negotiable.

Availability

AH1806-P-A is available at Aetrix Electronics and suitable for smart meter tamper detection, portable display lid switching, and industrial equipment interlocks requiring stable component supply across extended production lifecycles.

Supply support for AH1806-P-A 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 industrial, computing, and consumer markets.

The AH1806 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ultra-low-power, polarity-agnostic magnetic switching in battery-constrained and thermally demanding environments.

FAQ

What is the minimum magnetic field strength required to activate the AH1806-P-A?

The operate point (B_op) ranges from ±15 to ±45 Gauss depending on temperature and supply voltage, with typical value ±30 Gauss at 25°C and 3V. Activation occurs when perpendicular magnetic flux density exceeds this threshold - verified per DS36104 Rev. 8-2 magnetic characterization tables.

Can the AH1806-P-A drive an LED directly?

No. The open-drain output sinks only up to 2.5mA and requires an external pull-up resistor. Driving an LED would demand series current limiting and voltage translation; instead, it interfaces cleanly with MCU GPIOs or logic-level translators per the recommended 10–100kΩ pull-up configuration.

Is the SIP-3 (Ammo Pack) package compatible with standard SMT reflow profiles?

Yes. The AH1806-P-A in SIP-3 (Ammo Pack) is qualified for lead-free reflow per J-STD-020, with peak temperature ≤260°C and time above liquidus ≤60 seconds. Its gull-wing leads and 1.5mm profile ensure coplanarity and solder joint reliability on standard FR-4 PCBs.

Does the AH1806-P-A require an external capacitor?

Yes. A 10–100nF ceramic decoupling capacitor between VDD and GND is mandatory per datasheet Note 4 to stabilize power and enhance RF noise immunity. Omission causes erratic switching and increased susceptibility to EMI in real-world deployments.

AH1806-P-A Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 3-SIP

Packaging:: Cut Tape (CT)

Product Status:: Active

Function:: Omnipolar Switch

Technology:: Hall Effect

Polarization:: North Pole, South Pole

Sensing Range:: ±4.5mT Trip, ±4mT Release

Test Condition:: 25°C

Voltage - Supply:: 2.5V ~ 5.5V

Current - Supply (Max):: 16µA

Current - Output (Max):: 2.5mA

Output Type:: Open Drain

Features:: -

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 3-SIP

AH1806-P-A FAQ

1.How can I place an order for AH1806-P-A through Aetrix?

Please submit a Request for Quotation (RFQ) for AH1806-P-A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AH1806-P-A reliable?

The price and inventory of AH1806-P-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH1806-P-A is usually 5 days.

3.What payment methods are accepted for AH1806-P-A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1806-P-A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH1806-P-A?

AH1806-P-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AH1806-P-A order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AH1806-P-A?

For technical support, including AH1806-P-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1806-P-A requirements.

6.How does Aetrix verify that AH1806-P-A is sourced from the original manufacturer or authorized distributors?

All AH1806-P-A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AH1806-P-A meets industry standards.

7.What is the process for return or replacement of AH1806-P-A?

All AH1806-P-A units undergo pre-shipment inspection (PSI). If there is an issue with AH1806-P-A, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AH1806-P-A part is unused and in its original packaging.

Return procedure for AH1806-P-A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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