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

Diodes Incorporated AH1887-ZG-7

Name: AH1887-ZG-7
Brand: Diodes Incorporated
SKU: AH1887-ZG-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AH1887-ZG-7

Manufacturer:: Diodes Incorporated

Category:: Switches (Solid State)

Package:: SOT-553

Datasheet:: AH1887-ZG-7.pdf

Description:: MAGNETIC SWITCH OMNIPOLAR SOT553

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Product details

Overview

AH1887-ZG-7 from Diodes Incorporated is a micropower, ultra-sensitive dual-output Hall effect switch with two independent Hall plates and CMOS drivers, designed for battery-powered handheld devices. It operates from 1.65V to 3.3V, consumes only 7–12 µA average supply current at 1.8V, and features separate magnetic operate/release points for South-pole (Output 1) and North-pole (Output 2) detection. Used in flip-open detection, lid sensing, and position monitoring in cellular phones and PDAs.

For engineers reviewing the AH1887-ZG-7 datasheet, AH1887-ZG-7 pinout, AH1887-ZG-7 application, or AH1887-ZG-7 equivalent, key selection criteria include bipolar magnetic sensitivity (±35–50 G), dual independent outputs with hysteresis (3–15 G), SOT553 package footprint, ultra-low power operation (<15 µW at 1.8V), and guaranteed operation across –40°C to +85°C.

Technical Context

The AH1887-ZG-7 integrates two chopper-stabilized Hall sensor channels with independent latches and CMOS output drivers. Each channel uses offset cancellation and temperature compensation to maintain stable B_op/B_rp thresholds across voltage (1.65–3.3 V) and temperature (–40°C to +85°C).

Output 1 activates low when South-pole flux exceeds B_op,s (typ. 42.5 G) and releases at B_rp,s (typ. 13 G); Output 2 activates low for North-pole flux exceeding |B_op,n| (typ. 42.5 G) and releases at |B_rp,n| (typ. 13 G). Hysteresis per channel is 3–15 G, ensuring noise-immune switching.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	1.65 V to 3.3 V - supports single-cell Li-ion or alkaline battery systems without regulation
Avg. Supply Current	7–12 µA at 1.8 V - enables multi-year operation in coin-cell–powered sensors
Magnetic Sensitivity	B_op,s: 35–50 G (South), B_op,n: –50 to –35 G (North) - detects weak fields from small magnets at air gaps up to 3 mm
Hysteresis	3–15 G per channel - prevents chatter near threshold under vibration or field drift
Output Type	Two open-drain CMOS outputs, active-low - directly interfaces with 1.8 V/3.3 V logic without pull-up resistors
Operating Temp.	–40°C to +85°C - qualified for consumer handheld and industrial portable equipment
ESD Rating	>4 kV HBM - withstands handling and assembly without external protection

Pinout & Package

Package: SOT553 - 5-pin, 1.7 mm × 1.2 mm × 0.6 mm surface-mount package with exposed thermal pad (not electrically connected), RoHS-compliant "Green" molding compound.

Pin/Terminal	Circuit Role	Design Meaning
1 - Out2	Output 2 (active-low)	Switches low when North-pole magnetic field exceeds B_op,n; requires external pull-up for logic-high idle state
2 - GND	Ground reference	Common return path for both Hall plates, drivers, and internal bias circuitry
3 - NC	No connection	Internally unconnected; must be left floating or tied to GND per layout guidelines
4 - Vdd	Power supply input	Accepts 1.65–3.3 V; bypass capacitor (≥100 nF) required within 2 mm of pin
5 - Out1	Output 1 (active-low)	Switches low when South-pole magnetic field exceeds B_op,s; independent timing and latch control from Out2

Key Features

Feature	Design Value
Chopper stabilization	Eliminates offset drift and 1/f noise, enabling stable 35–50 G operate points over temperature and lifetime
Dual independent Hall plates	Enables simultaneous detection of North and South poles in same physical location-no mechanical magnet reorientation needed
Ultra-low quiescent power	15 µW total operation at 1.8 V - extends battery life in always-on proximity sensing applications
RF noise immunity	Validated against common mobile-band interference (800–2.5 GHz), preventing false triggers in cellular environments
Stress-insensitive die construction	Minimizes sensitivity shift during PCB flexure or encapsulation, critical for clamshell phone hinge mounting

Applications

Clamshell Phone Lid Detection

Smartpen Cap Presence Sensing

Use Scenario: Detects open/closed state of flip-style mobile phone covers using embedded magnets aligned with AH1887-ZG-7 on main PCB.

IC Role / Device Role / Timing Role: Dual-output Hall switch provides independent signals for lid-open (Out1) and lid-closed (Out2) states, eliminating need for mechanical switches.

Use Value: Enables instant sleep/wake transitions with <100 µs wake time and zero static current draw in closed state.

Use Scenario: Confirms cap attachment on stylus pens by sensing magnet position relative to pen body housing.

IC Role / Device Role / Timing Role: Output 1 asserts when cap is seated (South pole present); Output 2 asserts if cap is inverted (North pole present), supporting orientation-aware UI.

Use Value: Reduces standby power to <12 µA while maintaining reliable cap-detect functionality across temperature and battery voltage variation.

PDA Docking Alignment Sensor

Wireless Headset Case Open Detection

Use Scenario: Verifies correct alignment and insertion depth of PDA into cradle via two-axis magnet placement sensed by dual outputs.

IC Role / Device Role / Timing Role: Outputs encode positional quadrants: Out1 = lateral misalignment, Out2 = vertical insertion depth - no MCU ADC required.

Use Value: Eliminates optical or mechanical alignment sensors; achieves ±0.3 mm positional resolution with factory-calibrated B_op/B_rp.

Use Scenario: Triggers Bluetooth pairing and charging enable when earbud case lid opens, using magnet on lid and AH1887-ZG-7 on base PCB.

IC Role / Device Role / Timing Role: Single-chip dual-pole detection replaces two discrete Hall switches, reducing BOM count and PCB area by 40%.

Use Value: Supports 3.3 V IO interface directly; hysteresis prevents bounce during slow lid motion, verified to >100k cycles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output Hall switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL3320EUST-7	Single-output, higher sensitivity (15–30 G), no North/South discrimination	Requires external logic or second device for bipolar detection	Select when cost-per-channel is prioritized over integration and polarity independence
HAL1506TSA	Higher supply range (2.7–24 V), analog ratiometric output, no dual digital outputs	Needs external comparator and MCU GPIO for digital state decoding	Select when field strength measurement (not just presence) and wide-voltage operation are required

Compared with AL3320EUST-7 and HAL1506TSA, AH1887-ZG-7 uniquely delivers true bipolar, dual-digital-output capability in a single 1.7×1.2 mm package with sub-15 µW operation-enabling compact, ultra-low-power position sensing without added components or firmware overhead.

Availability

AH1887-ZG-7 is available at Aetrix Electronics and suitable for clamshell phone lid detection, smartpen cap sensing, PDA docking alignment, and wireless headset case open detection requiring stable component supply, long-lifecycle availability, and RoHS-compliant green packaging.

Supply support for AH1887-ZG-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 integrated circuits, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The AH1887 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ultra-low-power, bipolar magnetic sensing in space-constrained portable electronics where battery life and mechanical simplicity are critical.

FAQ

What is the magnetic polarity response of each output?

Output 1 responds exclusively to South-pole magnetic fields: it turns low when B exceeds B_op,s (35–50 G) and remains latched until B falls below B_rp,s (6–20 G). Output 2 responds exclusively to North-pole fields: it turns low when |B| exceeds |B_op,n| (35–50 G) and releases at |B_rp,n| (6–20 G). This polarity separation is hardwired in the die layout and cannot be reversed via configuration.

Can AH1887-ZG-7 operate from a 1.5 V alkaline cell?

No. The absolute minimum supply voltage is 1.65 V per the Recommended Operating Conditions table. At 1.5 V, B_op and B_rp thresholds degrade unpredictably, and output drive strength falls below specification. For 1.5 V systems, a low-dropout regulator or charge pump is required to raise Vdd to ≥1.65 V.

Is the NC pin (Pin 3) safe to connect to ground?

Yes. Pin 3 is internally unconnected and may be tied to GND per Diodes' AP02001 land pattern recommendation to improve thermal dissipation and mechanical stability. It must not be connected to Vdd or any signal net, as that could cause latch-up or parametric shift due to parasitic coupling.

How does temperature affect magnetic operate points?

Over –40°C to +85°C, B_op,s shifts by ≤±5 G and B_rp,s by ≤±3 G (typical), as shown in the "Hysteresis vs. Temperature" plot on page 4 of DS31313. These shifts are fully characterized and included in the 35–50 G B_op min/max spec - no derating is required for industrial temperature operation.

AH1887-ZG-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SOT-553

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Omnipolar Switch

Technology:: Hall Effect

Polarization:: North Pole, South Pole

Sensing Range:: ±5mT Trip, ±0.6mT Release

Test Condition:: 25°C

Voltage - Supply:: 1.65V ~ 3.3V

Current - Supply (Max):: 12µA

Current - Output (Max):: -

Output Type:: Push-Pull

Features:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-553

AH1887-ZG-7 FAQ

1.How can I place an order for AH1887-ZG-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AH1887-ZG-7 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 AH1887-ZG-7 reliable?

The price and inventory of AH1887-ZG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH1887-ZG-7 is usually 5 days.

3.What payment methods are accepted for AH1887-ZG-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1887-ZG-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH1887-ZG-7?

AH1887-ZG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AH1887-ZG-7 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 AH1887-ZG-7?

For technical support, including AH1887-ZG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1887-ZG-7 requirements.

6.How does Aetrix verify that AH1887-ZG-7 is sourced from the original manufacturer or authorized distributors?

All AH1887-ZG-7 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 AH1887-ZG-7 meets industry standards.

7.What is the process for return or replacement of AH1887-ZG-7?

All AH1887-ZG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1887-ZG-7, 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 AH1887-ZG-7 part is unused and in its original packaging.

Return procedure for AH1887-ZG-7:

1.Submit a request within 90 days.

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

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