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Diodes Incorporated AH3572-SA-7
- Part No.:
- AH3572-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3572-SA-7.pdf
- Description:
- MAG SWITCH OMNIPOLAR SOT23 T&R
- Quantity:
- Payment:
- Shipping:
Inventory:604
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Product details
Overview
AH3572-SA-7 from Diodes Incorporated is a high-voltage, high-sensitivity Hall effect omnipolar switch IC in SOT23 package, designed for proximity and position sensing in consumer appliances and industrial systems. It operates from 3.0V to 28V, features ±20G typical operate point (BOP), ±10G typical release point (BRP), and delivers open-drain output with 30–55mA current limit and <0.4V ON-state voltage at 20mA.
For engineers reviewing the AH3572-SA-7 datasheet, AH3572-SA-7 pinout, AH3572-SA-7 application, or AH3572-SA-7 equivalent, key selection considerations include its wide supply range, chopper-stabilized architecture for temperature stability, reverse battery protection, Zener clamps on VDD/output, and -40°C to +125°C operation in SOT23 footprint.
Technical Context
The AH3572 employs chopper-stabilized architecture with dynamic offset cancellation to minimize switch-point drift across temperature and supply voltage. Its internal bandgap regulator provides temperature-compensated biasing for analog blocks, enabling stable BOP/BRP thresholds over -40°C to +125°C.
It integrates reverse-blocking diode and Zener clamps on both VDD and OUTPUT pins for robustness against reverse polarity and transient overvoltage. The single open-drain output switches low when |B| exceeds BOP (±20G typ) and releases only when |B| falls below BRP (±10G typ), delivering 10µs typical power-on time and 3.75µs response delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - supports direct connection to 24V industrial rails without external regulation |
| Operate Point (BOP) | ±20G typical - enables reliable actuation with small, low-cost magnets at air gaps up to 3mm |
| Release Point (BRP) | ±10G typical - provides 10G hysteresis to prevent chatter near threshold |
| Output Type | Open-drain with 30–55mA current limit - drives standard pull-up loads while protecting against short-circuit faults |
| Operating Temperature | -40°C to +125°C - qualified for under-hood, motor control, and industrial enclosure environments |
| ESD Rating | HBM > 6kV - withstands handling and board assembly without additional protection circuitry |
| Power-On Time | 10µs typical - ensures fast system responsiveness after power-up or wake-from-sleep |
Pinout & Package
Package: SOT23 - surface-mount, 3-pin, JEDEC-standard outline (2.9mm × 1.3mm × 1.0mm), RoHS-compliant, lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Positive supply input | Accepts 3.0–28V DC; includes integrated reverse-blocking diode and 28V Zener clamp for fault tolerance |
| 2 (GND) | Ground reference | Common return for internal regulator, sensor, and output stage; must be low-impedance for noise immunity |
| 3 (OUTPUT) | Open-drain output | Sinks up to 55mA when active; requires external pull-up; protected by Zener clamp and current limiting |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic sensitivity | Detects either South or North pole - eliminates magnet orientation constraints in mechanical assemblies |
| Chopper-stabilized architecture | Reduces thermal drift of BOP/BRP to ±10G over full temperature range - ensures consistent switching across environments |
| Integrated protection network | Reverse-blocking diode + dual Zener clamps (VDD & OUTPUT) - enables drop-in use in unregulated 24V systems without external TVS |
| Low start-up latency | 10µs power-on time - supports fast wake-up in battery-powered or duty-cycled sensing nodes |
| RF noise immunity | Validated performance in noisy EMI environments (e.g., motor drives, switching PSUs) without added filtering |
Applications
| Refrigerator Door Detection | Industrial Flow Meter Sensing |
|---|---|
Use Scenario: Detect door open/close state in smart refrigerators using a magnet mounted on the door and AH3572-SA-7 on the frame. IC Role / Device Role / Timing Role: Omnipolar Hall switch providing contactless, wear-free position feedback with 10µs response. Use Value: Eliminates mechanical switch wear and bounce; operates reliably across condensation-prone, wide-temperature interior environments (-20°C to +45°C). | Use Scenario: Monitor turbine rotation in HVAC water flow meters via embedded magnet on rotating impeller. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector generating pulse train proportional to flow rate. Use Value: Delivers clean, chatter-free pulses up to 10kHz due to 10G hysteresis and chopper stabilization - improves flow measurement accuracy. |
| Printer Paper Jam Detection | Smart Thermostat Position Sensing |
Use Scenario: Sense paper path obstruction using flag-mounted magnet and AH3572-SA-7 at critical rollers. IC Role / Device Role / Timing Role: Proximity switch triggering interrupt on jam condition with sub-millisecond latency. Use Value: Withstands 24V rail transients and ESD events common in office equipment; no false triggers from motor noise. | Use Scenario: Detect rotary encoder position or damper actuator end-stop in Wi-Fi thermostats. IC Role / Device Role / Timing Role: Level-sensitive position indicator interfacing directly to 3.3V or 5V microcontroller GPIO. Use Value: Single-supply operation from thermostat's 3.3V LDO avoids extra level-shifting; -40°C rating ensures outdoor unit compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall effect omnipolar switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3505-30D | BOP/BRP ±30G/±15G; wider thresholds but lower sensitivity; no reverse-battery protection | Requires stronger magnets or smaller air gaps; unsuitable for reverse-polarity-prone 24V systems | Select if higher magnetic immunity is needed and reverse protection is handled externally |
| US1881EUA-AAA-000 | Lower VDD max (24V); BOP/BRP ±25G/±15G; no integrated Zener clamp on output | Limited to 24V nominal rails; needs external TVS on output for surge protection | Choose for cost-sensitive designs where 24V compliance and external clamping are acceptable |
Compared with AL3505-30D and US1881EUA-AAA-000, the AH3572-SA-7 uniquely combines 28V operation, reverse-battery tolerance, dual Zener clamps, and ±20G sensitivity in SOT23 - making it optimal for ruggedized 24V industrial and appliance designs requiring minimal external protection.
Availability
AH3572-SA-7 is available at Aetrix Electronics and suitable for refrigerator door detection, industrial flow meter sensing, printer paper jam detection, and smart thermostat position sensing requiring stable component supply across automotive-grade temperature ranges and industrial voltage rails.
Supply support for AH3572-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, application-optimized components for industrial, computing, and consumer markets.
The AH3572 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, maintenance-free position and proximity sensing in harsh environments with wide supply voltage and extended temperature requirements.
FAQ
What is the maximum continuous output current for AH3572-SA-7?
The AH3572-SA-7 features an internal output current limit of 30–55mA, as specified in the Electrical Characteristics table. This protects the device during output short-circuit conditions while allowing direct drive of standard logic-level pull-up resistors or small indicator LEDs without external current limiting.
Does AH3572-SA-7 require an external capacitor on VDD?
Yes - a 10nF to 100nF ceramic decoupling capacitor (CIN) is recommended between VDD and GND, placed as close as possible to the device pins. This stabilizes the internal bandgap regulator and enhances immunity to power supply noise and RF interference, per the Typical Applications Circuit in the datasheet.
Can AH3572-SA-7 operate with a 3.3V microcontroller I/O pin as pull-up?
Yes - the open-drain OUTPUT pin is compatible with 3.3V pull-up resistors. When active, the output sinks current with ≤0.4V saturation voltage at 20mA, ensuring solid LOW-level recognition by 3.3V logic. No level-shifting is required, provided the microcontroller's I/O pin is configured as input with internal or external pull-up.
Is AH3572-SA-7 pin-compatible with other Diodes Hall switches in SOT23?
No - AH3572-SA-7 has a unique pinout (VDD-GND-OUTPUT) optimized for its protection architecture. While physically identical to standard SOT23, it is not pin-compatible with earlier Diodes Hall switches like AH180x or AH33xx series, which use different pin assignments (e.g., OUTPUT-GND-VDD). Always verify pin mapping before PCB layout.
AH3572-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:
- Obsolete
- Function:
- Omnipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±3mT Trip, ±0.2mT Release
- Test Condition:
- -40°C ~ 125°C
- Voltage - Supply:
- 3V ~ 28V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 55mA
- Output Type:
- Open Drain
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AH3572-SA-7 FAQ
1.How can I place an order for AH3572-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3572-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 AH3572-SA-7 reliable?
The price and inventory of AH3572-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 AH3572-SA-7 is usually 5 days.
3.What payment methods are accepted for AH3572-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3572-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3572-SA-7?
AH3572-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3572-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 AH3572-SA-7?
For technical support, including AH3572-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3572-SA-7 requirements.
6.How does Aetrix verify that AH3572-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH3572-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 AH3572-SA-7 meets industry standards.
7.What is the process for return or replacement of AH3572-SA-7?
All AH3572-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3572-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 AH3572-SA-7 part is unused and in its original packaging.
Return procedure for AH3572-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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