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

Diodes Incorporated AH3722-SA-7

Name: AH3722-SA-7
Brand: Diodes Incorporated
SKU: AH3722-SA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AH3722-SA-7

Manufacturer:: Diodes Incorporated

Category:: Switches (Solid State)

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: AH3722-SA-7.pdf

Description:: HALL LATCH SWITCH SSOT23 T&R 3K

Quantity:: RFQ Add To RFQ list

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Inventory:3,180

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Product details

Overview

AH3722-SA-7 from Diodes Incorporated is a high-voltage, bipolar Hall-effect latch IC designed for brushless DC motor commutation and RPM sensing in automotive and industrial systems. It operates from 3.0V to 28V, features open-drain output with 30–55mA current limiting, BOP/BRP of 10–40G / –40 to –10G (typ), and functions reliably from –40°C to +125°C.

For engineers reviewing the AH3722-SA-7 datasheet, AH3722-SA-7 pinout, AH3722-SA-7 application, or AH3722-SA-7 equivalent, key selection criteria include magnetic sensitivity hysteresis (20–80G), chopper-stabilized temperature stability, reverse supply protection (–18V), ESD robustness (8kV HBM), and SOT23 (Type S) package compatibility with space-constrained PCB layouts.

Technical Context

The AH3722-SA-7 implements a chopper-stabilized architecture with dynamic offset cancellation and internal bandgap regulation, delivering minimal switch-point drift across temperature and supply voltage. Its bipolar latch behavior-turning on with South pole and off with North pole-enables precise angular position detection in rotating systems.

It integrates reverse-blocking diode and zener clamp on VDD, plus output overcurrent limit and zener clamp, ensuring robust operation under electrical stress. The single open-drain output requires external pull-up and supports fast switching (tD = 4µs, tF = 0.1–1µs) with startup time of 10µs after VDD reaches 3V.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3.0V to 28V - enables direct connection to 12V/24V automotive and industrial rails without external regulators.
Operating Temperature	–40°C to +125°C - qualified for under-hood automotive and industrial ambient environments.
BOP / BRP (typ)	25G / –25G - provides reliable latching at low-field conditions typical in BLDC rotor position sensing.
Hysteresis BHY (typ)	50G - prevents chatter near magnetic thresholds during slow or noisy field transitions.
Output Type	Open-drain with 30–55mA current limit - allows flexible pull-up voltage selection and inherent short-circuit protection.
V_{OUT_ON} (I_OUT = 20mA)	0.2–0.4V - ensures low power dissipation and clean logic-low signaling into standard CMOS inputs.
ESD HBM	8kV - exceeds AEC-Q100 Class 2 requirements for handling and assembly robustness.

Pinout & Package

Package: SOT23 (Type S), 3-pin surface-mount, lead-free and RoHS-compliant per EU Directive 2015/863/EU.

Pin/Terminal	Circuit Role	Design Meaning
1	VDD	Power supply input with integrated reverse-blocking diode and zener clamp (–18V rating).
2	GND	Ground reference for internal regulator and output stage; must be low-impedance for stable chopper operation.
3	OUTPUT	Open-drain output with overcurrent limit (30–55mA) and zener clamp; requires external pull-up resistor (RL).

Key Features

Feature	Design Value
Bipolar Latch Operation	South pole activates output (low), North pole releases it - enables deterministic direction-sensitive position sensing.
Chopper Stabilization	500kHz chopping frequency eliminates offset drift, reducing BOP/BRP variation to ±10% over temperature.
High-Voltage Robustness	32V transient VDD rating and –18V reverse supply tolerance - withstands load-dump and battery-reverse events.
RF Noise Immunity	Integrated low-pass filtering and dynamic offset cancellation suppress common-mode EMI up to 1GHz.
Low-Power Startup	10µs startup time at ≥3V - supports fast-response speed measurement in pulsed or intermittent operation.

Applications

Brushless DC Motor Commutation

RPM Measurement

Use Scenario: Detecting rotor magnet polarity to sequence stator winding energization in 3-phase BLDC motors.

IC Role / Device Role / Timing Role: Bipolar latch providing synchronized edge-triggered signals for microcontroller-based commutation logic.

Use Value: Enables precise 60° electrical phase alignment with <5µs timing jitter, supporting motor efficiency >92% at 10k RPM.

Use Scenario: Counting magnetic pole transitions on rotating shafts in HVAC blowers or pump impellers.

IC Role / Device Role / Timing Role: Digital pulse generator converting mechanical rotation into TTL-compatible frequency output.

Use Value: Delivers stable 1–20kHz square-wave output with <1% duty cycle error across –40°C to +125°C ambient.

Flow Meter Sensing

Angular Position Indexing

Use Scenario: Monitoring turbine blade passage in liquid/gas flow meters using embedded magnets.

IC Role / Device Role / Timing Role: Magnetic threshold detector generating pulses proportional to volumetric flow rate.

Use Value: Supports flow resolution down to 0.05L/min with hysteresis preventing false counts from vibration-induced field noise.

Use Scenario: Detecting indexed notches or magnets on rotary encoders in industrial actuators or robotic joints.

IC Role / Device Role / Timing Role: Contactless position latch providing absolute angular state (on/off) per mechanical index.

Use Value: Eliminates mechanical wear and contact bounce, enabling >10M-cycle reliability in precision motion control.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL3722QSA-7	Automotive-grade (AEC-Q100 Grade 0), identical magnetic specs but qualified to +150°C junction temp.	Required for under-hood engine control modules where ambient exceeds +125°C.	Select when full automotive qualification and extended temperature margin are mandatory.
US5781LUA-AAA-000	Lower sensitivity (BOP = 35–70G), no chopper stabilization, 2.7–24V supply range.	Suitable for cost-sensitive consumer appliances but lacks thermal stability for industrial RPM accuracy.	Choose only for non-critical, room-temperature applications where BOP tolerance >±20G is acceptable.

Compared with AH3722-SA-7, AL3722QSA-7 adds AEC-Q100 qualification and higher junction temperature margin without altering magnetic performance, while US5781LUA-AAA-000 trades chopper stability and wide-voltage operation for lower unit cost in less demanding environments.

Availability

AH3722-SA-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, RPM measurement, and flow meter sensing requiring stable component supply across automotive, industrial automation, and appliance production programs.

Supply support for AH3722-SA-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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and sensing applications.

The AH372X series belongs to Diodes' high-voltage Hall-effect sensor product line, engineered specifically for robust position and speed sensing in harsh automotive and industrial environments.

FAQ

What is the magnetic polarity response of AH3722-SA-7?

The AH3722-SA-7 is a bipolar latch: it turns ON (output pulled low) when exposed to a sufficient South pole magnetic field perpendicular to the package marking side, and remains latched until a sufficient North pole field causes it to turn OFF. This behavior is confirmed in the datasheet's magnetic characteristics table for AH3722, with BOP = 10–40G (South) and BRP = –40 to –10G (North).

Can AH3722-SA-7 operate directly from a 24V truck battery system?

Yes - AH3722-SA-7 supports 3.0V to 28V supply voltage and includes integrated reverse-blocking diode and zener clamp on VDD, allowing direct connection to 24V systems. Its absolute maximum VDD rating is 32V (transient), and reverse supply tolerance is –18V, making it suitable for automotive load-dump and battery-reverse scenarios without external protection circuitry.

What external components are required for basic operation?

AH3722-SA-7 requires only two external components: a 10nF–100nF ceramic bypass capacitor (CIN) between VDD and GND for power stabilization and noise immunity, and a pull-up resistor (RL) on the open-drain OUTPUT pin. Typical RL values range from 1kΩ to 10kΩ depending on rise-time and bus voltage; no additional biasing or signal conditioning is needed.

Is AH3722-SA-7 pin-compatible with other AH372X variants?

Yes - all AH372X variants (AH3722, AH3724, AH3725, AH3727) share identical pinout (VDD-GND-OUTPUT) and SOT23 (Type S) package dimensions. They differ only in magnetic sensitivity (BOP/BRP), so AH3722-SA-7 can be substituted for AH3724-SA-7 or AH3725-SA-7 in the same footprint if the application's field strength matches the selected variant's threshold range.

AH3722-SA-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Latch, Bipolar Switch

Technology:: Hall Effect

Polarization:: North Pole, South Pole

Sensing Range:: 4mT Trip, -4mT 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:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23 (Type S)

AH3722-SA-7 FAQ

1.How can I place an order for AH3722-SA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AH3722-SA-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 AH3722-SA-7 reliable?

The price and inventory of AH3722-SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3722-SA-7 is usually 5 days.

3.What payment methods are accepted for AH3722-SA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3722-SA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH3722-SA-7?

AH3722-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AH3722-SA-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 AH3722-SA-7?

For technical support, including AH3722-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3722-SA-7 requirements.

6.How does Aetrix verify that AH3722-SA-7 is sourced from the original manufacturer or authorized distributors?

All AH3722-SA-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 AH3722-SA-7 meets industry standards.

7.What is the process for return or replacement of AH3722-SA-7?

All AH3722-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3722-SA-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 AH3722-SA-7 part is unused and in its original packaging.

Return procedure for AH3722-SA-7:

1.Submit a request within 90 days.

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

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