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Diodes Incorporated AH3372-SA-7
- Part No.:
- AH3372-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3372-SA-7.pdf
- Description:
- MAGNETIC SWITCH UNIPOLAR SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,895
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Product details
Overview
AH3372-SA-7 from Diodes Incorporated is a high-voltage, high-sensitivity Hall effect unipolar switch IC in SOT23 package, designed for proximity and position sensing in home appliances and industrial systems. It operates from 3.0V to 28V, features ±30G/±20G typical operate/release points (BOP/BRP), open-drain output with 60mA continuous current rating, and -40°C to +125°C operating temperature range.
For engineers reviewing the AH3372-SA-7 datasheet, AH3372-SA-7 pinout, AH3372-SA-7 application, or AH3372-SA-7 equivalent, this device supports robust contactless switching in high-noise, wide-temperature, and variable-supply environments - especially where reverse-battery protection, ESD immunity (>6kV HBM), and chopper-stabilized magnetic threshold stability are required.
Technical Context
The AH3372 employs chopper-stabilized architecture with dynamic offset cancellation to minimize thermal drift of BOP/BRP - achieving ±15G to ±45G BOP and ±5G to ±35G BRP across -40°C to +125°C. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, ensuring consistent switching behavior independent of supply voltage variation within 3.0–28V.
It integrates reverse-blocking diode and Zener clamps on both VDD and OUTPUT pins, enabling operation under reverse-battery conditions (up to -28V) and transient overvoltage events. The single open-drain output switches low when South pole field exceeds BOP, remains latched until field drops below BRP, and ignores North pole fields - polarity orientation depends on package marking side per SOT23/SC59/SIP-3 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - supports direct connection to 12V/24V industrial rails without external regulation |
| Operate Point (BOP) | +30G typical - detects weak magnetic fields from small or distant magnets in compact assemblies |
| Release Point (BRP) | +20G typical - provides 10G hysteresis to prevent chatter near threshold in noisy mechanical environments |
| Output Type | Open-drain with 60mA continuous rating - interfaces directly with microcontroller GPIO or logic-level pull-up networks |
| ESD Rating | HBM > 6kV - withstands handling and board-level electrostatic discharge without external protection |
| Operating Temperature | -40°C to +125°C - qualified for under-hood, motor control, and sealed-appliance applications |
| Response Time | 3.75µs typical - enables real-time detection in fast-moving position or flow metering systems |
Pinout & Package
Package: SOT23 - surface-mount, 3-pin, JEDEC-standard outline (3.0mm × 1.3mm × 1.0mm), RoHS-compliant, lead-free, halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive power supply input | Accepts 3.0–28V DC; includes reverse-blocking diode and Zener clamp for fault tolerance |
| 2 - GND | Ground reference | Common return path for internal circuitry and output load current |
| 3 - OUTPUT | Open-drain output | Sinks up to 60mA when active; requires external pull-up; clamped to 28V max off-state |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized architecture | Reduces thermal drift of BOP/BRP to <±15G over full temperature range, eliminating manual calibration |
| Integrated reverse-battery protection | Withstands -28V supply transients without damage or latch-up, removing need for external diode |
| Zener clamps on VDD and OUTPUT | Limit voltage excursions to 28V on supply and output pins, protecting against inductive kickback and ESD |
| High magnetic sensitivity | BOP = +30G typical enables use with low-strength ferrite magnets or increased air gaps in mechanical designs |
| Robust RF noise immunity | Validated performance in presence of 200MHz–1GHz RF fields common in motor drives and wireless-enabled appliances |
Applications
| Washing Machine Lid Detection | Industrial Flow Meter Rotor Sensing |
|---|---|
|
Use Scenario: Detect lid closure/open state in top-loading washing machines using embedded magnet and PCB-mounted sensor. IC Role / Device Role / Timing Role: Unipolar Hall switch providing latched ON/OFF signal to MCU based on magnet proximity during lid motion. Use Value: Eliminates mechanical microswitches prone to wear; operates reliably at 125°C ambient near motor housing and withstands detergent vapor exposure. |
Use Scenario: Sense rotation of turbine blades in water/gas flow meters via embedded magnets passing sensor location. IC Role / Device Role / Timing Role: High-speed magnetic threshold detector generating clean pulse train for flow rate calculation. Use Value: 3.75µs response time and chopper stabilization ensure accurate pulse timing across temperature and supply variations, improving meter accuracy class compliance. |
| Smart Vacuum Cleaner Brush Roll Monitoring | Office Printer Paper Jam Detection |
|
Use Scenario: Monitor brush roll rotation and stall condition in cordless vacuum cleaners using magnet-embedded roller and PCB sensor. IC Role / Device Role / Timing Role: Proximity-triggered switch signaling RPM and stall via pulse frequency and duty cycle changes. Use Value: 3.0–28V operation allows direct use with Li-ion battery packs (8.4V–25.2V); reverse-battery protection guards against accidental polarity reversal during service. |
Use Scenario: Detect paper presence at critical feed points (e.g., registration rollers, exit tray) in multifunction printers. IC Role / Device Role / Timing Role: Position-sensitive unipolar switch indicating paper edge passage or jam-induced stoppage. Use Value: ESD >6kV HBM prevents field failures during paper handling; SIP-3/SOT23 packages enable ultra-thin sensor placement in tight paper path geometries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unipolar Hall switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3322 (Diodes Inc.) | Narrower supply range (2.5–24V); lower sensitivity (BOP = +40G typical); no reverse-battery protection | Limited to low-voltage consumer devices; unsuitable for 24V industrial rails or reverse-polarity environments | Select AH3322 only if cost sensitivity outweighs robustness requirements and supply stays ≤24V. |
| AL3372 (Allegro MicroSystems) | Same 3–28V range and SOT23 package; BOP = +35G typical; lacks integrated Zener clamp on output | Requires external TVS on output for surge protection; slightly higher magnetic threshold reduces usable air gap | Choose AL3372 only when legacy Allegro design reuse is mandatory and external clamping is acceptable. |
Compared with AH3322 and AL3372, the AH3372-SA-7 uniquely combines reverse-battery tolerance, dual Zener clamping, and tighter BOP/BRP spread - making it the only option qualified for harsh 24V industrial sensing where supply faults and ESD events are routine.
Availability
AH3372-SA-7 is available at Aetrix Electronics and suitable for washing machine lid detection, industrial flow metering, smart vacuum brush monitoring, and office printer paper jam detection requiring stable component supply across automotive-grade temperature ranges and long production lifecycles.
Supply support for AH3372-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 power management, signal integrity, and sensing solutions for industrial, computing, and consumer markets.
The AH3372 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, maintenance-free position and proximity sensing in cost-sensitive, high-volume home appliance and factory automation systems.
FAQ
What is the correct magnet polarity orientation for AH3372-SA-7 (SOT23 package)?
For the SOT23-packaged AH3372-SA-7, the South pole must be presented to the part marking side of the package to activate the output. This is explicitly defined in the datasheet's magnetic polarity diagram and differs from SC59, which requires South pole on the non-marking side. Incorrect orientation results in no switching action.
Does AH3372-SA-7 require an external bypass capacitor?
Yes - a 10nF to 100nF ceramic capacitor (CIN) between VDD and GND is recommended per the datasheet to stabilize the internal regulator and improve RF noise immunity. Omitting CIN may cause erratic switching or increased susceptibility to conducted EMI in motor-driven or switching-power-supply environments.
Can AH3372-SA-7 drive an LED directly without a current-limiting resistor?
No - the AH3372-SA-7 has an open-drain output rated for 60mA continuous sink current, but driving an LED directly would exceed safe operating limits without series resistance. A minimum 220Ω resistor is required for standard 20mA LEDs at 5V pull-up; higher voltages demand proportionally larger resistors to limit current below 60mA.
Is AH3372-SA-7 qualified for automotive applications?
No - while AH3372-SA-7 operates from -40°C to +125°C and meets AEC-Q200 stress test recommendations for temperature and ESD, it is not officially AEC-Q100 qualified. Diodes does not list it in their automotive-grade portfolio, and the datasheet specifies industrial/consumer home appliance use only.
AH3372-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:
- Unipolar Switch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 3mT Trip, 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:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AH3372-SA-7 FAQ
1.How can I place an order for AH3372-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3372-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 AH3372-SA-7 reliable?
The price and inventory of AH3372-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 AH3372-SA-7 is usually 5 days.
3.What payment methods are accepted for AH3372-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3372-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3372-SA-7?
AH3372-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3372-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 AH3372-SA-7?
For technical support, including AH3372-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3372-SA-7 requirements.
6.How does Aetrix verify that AH3372-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH3372-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 AH3372-SA-7 meets industry standards.
7.What is the process for return or replacement of AH3372-SA-7?
All AH3372-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3372-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 AH3372-SA-7 part is unused and in its original packaging.
Return procedure for AH3372-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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