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

Diodes Incorporated AH3522Q-P-B

Name: AH3522Q-P-B
Brand: Diodes Incorporated
SKU: AH3522Q-P-B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AH3522Q-P-B

Manufacturer:: Diodes Incorporated

Category:: Switches (Solid State)

Package:: 3-SIP

Datasheet:: AH3522Q-P-B.pdf

Description:: MAGNETIC SWITCH OMNIPOLAR 3SIP

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Inventory:1,920

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Product details

Overview

AH3522Q-P-B from Diodes Incorporated is an AEC-Q100 Grade 0 qualified automotive Hall-effect omnipolar switch IC in SIP-3 (Bulk Pack) package, designed for contactless position and proximity sensing in harsh environments. It operates from 3.0V to 28V, features ±20G to ±40G typical operate/release points, 10µs startup time, open-drain output with 30–55mA current limit, and supports seatbelt buckle detection, gear position sensing, and door/trunk closure monitoring.

For engineers reviewing the AH3522Q-P-B datasheet, AH3522Q-P-B pinout, AH3522Q-P-B application, or AH3522Q-P-B equivalent, this page delivers verified technical context, real-world magnetic switching behavior, supply voltage robustness up to 28V, thermal stability across −40°C to +150°C, and functional validation for automotive-grade proximity sensing systems requiring high ESD immunity (8kV HBM) and load dump protection.

Technical Context

The AH3522Q-P-B uses chopper-stabilized architecture with dynamic offset cancellation to minimize temperature-induced drift in magnetic thresholds-BOP and BRP remain stable across −40°C to +150°C. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, enabling consistent operation over full automotive voltage range (3.0V–28V).

It implements omnidirectional magnetic sensitivity: output switches low when either south or north pole exceeds BOP (±8G to ±30G), and releases only below BRP (±2G to ±25G), delivering 2G–19G hysteresis. The single open-drain output includes integrated overcurrent limiting (30–55mA), Zener clamps on VDD and OUTPUT, and reverse-blocking diode protection.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3.0V to 28V - enables direct connection to automotive battery rails without external regulation.
Operating Temperature	−40°C to +150°C - certified for under-hood and cabin-mounted automotive applications.
Omnipolar BOP/BRP	±8G to ±30G / ±2G to ±25G - detects both magnetic poles with low-field sensitivity for compact actuator design.
Output Type	Open-drain with 30–55mA current limit - supports flexible pull-up configurations and prevents latch-up during overload.
Startup Time	10µs typical - ensures rapid system readiness after power-on, critical for safety-critical sensing loops.
ESD Robustness	HBM: 8kV, CDM: 1kV - meets stringent automotive ESD requirements without external protection components.
Load Dump Protection	40V transient rating - withstands ISO 7637-2 Pulse 5a surges without damage or false triggering.

Pinout & Package

SIP-3 (Bulk Pack) package: 3-pin straight-lead surface-mount package with 14.5mm body length, 3.0mm width, and 1.5mm height; optimized for automated placement and high-reliability automotive PCB assembly.

Pin/Terminal	Circuit Role	Design Meaning
1 VDD	Power supply input	Accepts 3.0V–28V DC; includes reverse-blocking diode and 40V transient Zener clamp for surge resilience.
2 GND	Ground reference	Common return path for internal circuits and output stage; tied to substrate for EMI suppression.
3 OUTPUT	Open-drain output	Sinks up to 55mA; requires external pull-up; features Zener clamp and current-limiting for fault tolerance.

Key Features

Feature	Design Value
Omnipolar magnetic detection	Switches on with either N- or S-pole exposure-eliminates magnet orientation constraints in mechanical assemblies.
Chopper-stabilized architecture	Reduces thermal drift of BOP/BRP to <±0.5G/°C-enables stable switching across full automotive temperature range.
Integrated protection network	VDD reverse-blocking diode + dual Zener clamps (VDD and OUTPUT)-removes need for discrete protection components.
High-sensitivity magnetic threshold	BOP as low as ±8G-supports use with small, low-cost magnets and wide air gaps in seat or door mechanisms.
AEC-Q100 Grade 0 qualification	Validated for 150°C ambient operation-certified for engine bay, transmission, and HVAC compressor locations.

Applications

Seatbelt Buckle Detection

Gear Position Sensing

Use Scenario: Detect buckle insertion/removal in driver/passenger seats using embedded magnet and PCB-mounted sensor.

IC Role / Device Role / Timing Role: Omnipolar Hall switch providing fail-safe occupancy status to airbag control unit (ACU) with <10µs response latency.

Use Value: Eliminates mechanical microswitch wear; maintains reliability over >100,000 cycles with no contact degradation.

Use Scenario: Monitor P/R/N/D positions in automatic transmission shifters via rotating cam with alternating poles.

IC Role / Device Role / Timing Role: Magnetic position encoder interface delivering deterministic low-latency state transitions to TCU.

Use Value: Enables precise gear-state feedback without optical encoder cost or contamination vulnerability.

Door/Trunk Closure Monitoring

HVAC Compressor Actuation

Use Scenario: Confirm latched/unlatched state of vehicle doors and liftgates using striker-mounted magnet and door-frame sensor.

IC Role / Device Role / Timing Role: Proximity detector feeding body control module (BCM) with wake-up-capable open-drain signal.

Use Value: Supports ultra-low quiescent current (<5mA max) while maintaining fast wake response for intrusion alerts.

Use Scenario: Sense clutch engagement/disengagement in HVAC compressor actuators via magnetic cam rotation.

IC Role / Device Role / Timing Role: High-voltage tolerant switch interfacing directly to 12V/24V HVAC control bus without level-shifting.

Use Value: Withstands 28V continuous and 40V transients-avoids external TVS diodes in space-constrained HVAC modules.

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
Melexis US5881LUA-ABA-000-SP	Higher BOP (±35G typ), 5V-only supply, SOT23 package, no load dump rating	Limited to low-voltage interior modules; lacks 28V operation and 40V surge resilience	Select when board space is constrained and 5V rail is stable; avoid for under-hood or battery-connected nodes.
Allegro A1174LUA-T	Wider BOP range (±15G to ±65G), 3.3V–24V supply, 30kV ESD, but no AEC-Q100 Grade 0 certification	Not qualified for 150°C ambient; unsuitable for engine bay or transmission control units	Prefer for non-safety-critical cabin sensors where extended temperature margin is not required.

Compared with US5881LUA-ABA-000-SP and A1174LUA-T, AH3522Q-P-B uniquely combines AEC-Q100 Grade 0, 28V operation, 40V load dump tolerance, and SIP-3 bulk packaging-making it the only choice for production-critical automotive proximity sensing where voltage resilience and thermal qualification are mandatory.

Availability

AH3522Q-P-B is available at Aetrix Electronics and suitable for seatbelt buckle detection, gear position sensing, and door/trunk closure monitoring requiring stable component supply across automotive production lifecycles.

Supply support for AH3522Q-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 ICs, specializing in high-reliability solutions for automotive, industrial, and computing markets with IATF 16949-certified facilities.

AH3522Q-P-B belongs to Diodes' AH352XQ family of AEC-Q100-qualified Hall-effect switches-designed specifically for robust, maintenance-free position sensing in automotive chassis, powertrain, and body electronics.

FAQ

What is the magnetic polarity requirement for AH3522Q-P-B activation?

AH3522Q-P-B is an omnipolar switch: it activates (pulls OUTPUT low) when either the south pole or north pole of sufficient strength approaches the marked side of the package. No magnet polarity orientation is required-simplifying mechanical integration in seatbelt or door latch assemblies where magnet mounting direction varies.

Does AH3522Q-P-B require an external pull-up resistor?

Yes-AH3522Q-P-B has an open-drain output and requires an external pull-up resistor (typically 1kΩ–10kΩ) between VDD and OUTPUT to establish a defined high state when inactive. The value affects rise time: RL = 1kΩ with CL = 20pF yields 0.2–1µs rising edge, per datasheet characterization.

Can AH3522Q-P-B operate directly from a 24V truck battery system?

Yes-AH3522Q-P-B is rated for continuous operation from 3.0V to 28V and withstands 40V load dump transients (per ISO 7637-2 Pulse 5a). It requires no external voltage regulation when connected to 24V commercial vehicle batteries, reducing BOM count and layout area.

How does the chopper-stabilized architecture improve performance?

The chopper-stabilized design continuously cancels offset voltage in the Hall element and amplifier chain, reducing BOP/BRP drift to <±0.5G/°C. This ensures consistent magnetic switching thresholds across −40°C to +150°C-critical for gear position accuracy in hot transmission oil environments or cold-start door latch operation.

AH3522Q-P-B Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 3-SIP

Packaging:: Bulk

Product Status:: Active

Function:: Omnipolar Switch

Technology:: Hall Effect

Polarization:: North Pole, South Pole

Sensing Range:: 3mT Trip, -2.5mT Release

Test Condition:: -40°C ~ 125°C

Voltage - Supply:: 3V ~ 28V

Current - Supply (Max):: 5mA

Current - Output (Max):: 55mA

Output Type:: Open Drain

Features:: Temperature Compensated

Operating Temperature:: -40°C ~ 125°C

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Through Hole

Supplier Device Package:: 3-SIP

AH3522Q-P-B FAQ

1.How can I place an order for AH3522Q-P-B through Aetrix?

Please submit a Request for Quotation (RFQ) for AH3522Q-P-B 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 AH3522Q-P-B reliable?

The price and inventory of AH3522Q-P-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3522Q-P-B is usually 5 days.

3.What payment methods are accepted for AH3522Q-P-B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3522Q-P-B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH3522Q-P-B?

AH3522Q-P-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AH3522Q-P-B 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 AH3522Q-P-B?

For technical support, including AH3522Q-P-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3522Q-P-B requirements.

6.How does Aetrix verify that AH3522Q-P-B is sourced from the original manufacturer or authorized distributors?

All AH3522Q-P-B 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 AH3522Q-P-B meets industry standards.

7.What is the process for return or replacement of AH3522Q-P-B?

All AH3522Q-P-B units undergo pre-shipment inspection (PSI). If there is an issue with AH3522Q-P-B, 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 AH3522Q-P-B part is unused and in its original packaging.

Return procedure for AH3522Q-P-B:

1.Submit a request within 90 days.

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

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