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Diodes Incorporated AH3322-SA-7
- Part No.:
- AH3322-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3322-SA-7.pdf
- Description:
- HALL UNIPOLAR SWITCH SSOT23 T&R
- Quantity:
- Payment:
- Shipping:
Inventory:1,649
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Product details
Overview
AH3322-SA-7 from Diodes Incorporated is a high-voltage, unipolar Hall-effect switch IC in SOT23 (Type S) package, designed for proximity and position sensing in home appliances and industrial equipment. It operates from 3.0V to 28V, features 30G typical operate point (BOP), 20G typical release point (BRP), open-drain output with 60mA continuous current rating, and functions reliably across –40°C to +125°C.
For engineers reviewing the AH3322-SA-7 datasheet, AH3322-SA-7 pinout, AH3322-SA-7 application, or AH3322-SA-7 equivalent, key selection criteria include magnetic sensitivity thresholds, supply voltage range compatibility, open-drain drive capability, thermal derating in SOT23, and polarity-dependent activation geometry relative to package marking side.
Technical Context
The AH3322-SA-7 uses chopper-stabilized architecture with dynamic offset cancellation to achieve ±0.5G typical BOP drift over temperature and supply voltage. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, enabling stable switching points across –40°C to +125°C and 3.0V–28V VDD.
Magnetic actuation requires South pole orientation toward the part marking side for SOT23 (Type S) packages. The device integrates reverse-blocking diode, zener clamps on VDD and OUTPUT pins, and output overcurrent limiting at 30–55mA - all supporting robust operation in noisy, high-voltage industrial environments.
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) | 15G to 45G (typ. 30G) - enables reliable detection of weak magnetic fields from small or distant magnets |
| Release Point (BRP) | 5G to 35G (typ. 20G) - provides 10G minimum hysteresis to prevent chatter near threshold |
| Output Type | Open-drain, rated for 60mA continuous sink - compatible with standard pull-up resistors and microcontroller inputs |
| Startup Time | 10µs typical - ensures fast system response after power-on, critical for real-time position monitoring |
| ESD Rating | HBM ±8kV - protects against handling damage and board-level ESD events in manufacturing and field service |
| Operating Temperature | –40°C to +125°C - qualified for under-hood, motor control, and enclosed appliance environments |
Pinout & Package
SOT23 (Type S) package: 3-pin surface-mount, 2.9mm × 2.4mm footprint, 1.0mm max height, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Positive supply input - accepts 3.0V–28V; includes reverse-blocking diode and zener clamp for fault protection |
| 2 | GND | Ground reference - connects to system common; internal circuit bias and sensor return path |
| 3 | OUTPUT | Open-drain output - sinks current when activated by South pole; requires external pull-up for logic-high state |
Key Features
| Feature | Design Value |
|---|---|
| Chopper stabilization | Reduces thermal drift of BOP/BRP to <±0.5G over full temperature range, eliminating manual calibration |
| South-pole activation geometry | Requires magnet south pole facing part marking side - simplifies mechanical design for consistent actuation direction |
| Zener clamps on VDD and OUTPUT | Clamp transients to ≤28V on supply and ≤32V on output - prevents latch-up during load dump or inductive kickback |
| Reverse supply protection | Withstands –18V reverse bias - eliminates need for external blocking diode in battery-reversal-prone systems |
| RF noise immunity | Validated against IEC 61000-4-3 radiated immunity - maintains stable switching in motor drives and switching power supplies |
Applications
| Washing Machine Lid Detection | Dishwasher Door Position Sensing |
|---|---|
Use Scenario: Detect lid open/closed state during wash cycle to disable motor and heating elements. IC Role / Device Role / Timing Role: Unipolar Hall switch providing fail-safe mechanical position feedback with no moving contacts. Use Value: Enables EN/STOP logic assertion within 10µs of magnetic field change, meeting IEC 60335 safety timing requirements. |
Use Scenario: Confirm door latched position before initiating high-temperature drying cycle. IC Role / Device Role / Timing Role: Proximity sensor interfacing directly with MCU GPIO via open-drain output. Use Value: Operates reliably at 24V supply with ±8kV ESD tolerance, reducing field failure rates in humid kitchen environments. |
| Industrial Conveyor Belt Object Counting | Smart Thermostat Fan Speed Control |
Use Scenario: Count metal parts passing fixed location using embedded magnet on conveyor carrier. IC Role / Device Role / Timing Role: High-speed magnetic threshold detector with 4µs response delay and 0.1µs falling time. Use Value: Supports >10kHz counting rate with minimal jitter due to chopper-stabilized analog front-end. |
Use Scenario: Monitor brushless DC fan rotation via embedded magnet on shaft for closed-loop speed regulation. IC Role / Device Role / Timing Role: Edge-triggered position feedback element feeding tachometer signal to fan controller. Use Value: Delivers stable pulse train across –40°C to +125°C ambient, eliminating thermal recalibration in HVAC enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unipolar Hall switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3322SCTR | Lower supply range (2.5V–24V); BOP/BRP tighter tolerance (±3G vs ±15G); no reverse supply protection | Optimized for battery-powered portable devices, not 24V industrial rails | Select if operating below 3.0V or requiring tighter magnetic threshold repeatability; avoid for reverse-voltage risk environments |
| US1881EUA-AB | Higher BOP (60G typ); no zener clamp on output; HBM ESD = 4kV (vs 8kV) | Better suited for strong-field applications like motor commutation; less robust in ESD-prone assembly lines | Choose for high-sensitivity detection where magnet strength exceeds 60G; verify layout-level ESD mitigation if used in production test areas |
Compared with AL3322SCTR and US1881EUA-AB, the AH3322-SA-7 uniquely combines 28V absolute max supply, reverse-voltage tolerance, and 8kV ESD in a cost-effective SOT23 package - making it optimal for 24V industrial controls where reliability under electrical stress is non-negotiable.
Availability
AH3322-SA-7 is available at Aetrix Electronics and suitable for washing machine lid detection, dishwasher door sensing, industrial conveyor object counting, and smart thermostat fan monitoring requiring stable component supply across automotive-grade temperature ranges and high-voltage industrial environments.
Supply support for AH3322-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 company specializing in discrete, analog, and mixed-signal solutions for industrial, consumer, computing, and communications markets.
The AH332X series belongs to Diodes' high-voltage Hall-effect sensor product line, engineered specifically for robust position and proximity sensing in harsh environments where wide supply range, thermal stability, and ESD resilience are mandatory.
FAQ
What is the correct magnet polarity and orientation for activating AH3322-SA-7?
The AH3322-SA-7 in SOT23 (Type S) package requires a South pole oriented toward the part marking side of the package to activate. This is confirmed in the datasheet's magnetic polarity diagram and differs from SC59 variants, which require South pole on the non-marking side. Incorrect orientation results in no output switching.
Can AH3322-SA-7 be used directly with a 24V PLC input without level shifting?
Yes - its 3.0V–28V supply range and open-drain output with 32V off-state voltage rating allow direct interface to 24V PLC digital inputs. A pull-up resistor to 24V is required, and the output sink capability (60mA) exceeds typical PLC input current requirements (<5mA), ensuring reliable logic-low assertion.
Does AH3322-SA-7 require an external bypass capacitor?
Yes - the datasheet specifies a 10nF–100nF ceramic capacitor (CIN) between VDD and GND to stabilize the internal regulator and improve RF noise immunity. Omitting CIN increases susceptibility to supply ripple and may cause erratic switching, especially in motor-driven or switching-power-supply environments.
How does the chopper stabilization architecture improve performance over conventional Hall switches?
Chopper stabilization dynamically cancels offset voltage in the Hall element and amplifier chain, reducing BOP/BRP drift to <±0.5G over –40°C to +125°C and 3.0V–28V. This eliminates the need for system-level calibration and ensures consistent magnetic threshold behavior across temperature and supply variations - critical for safety-critical position sensing.
AH3322-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:
- Unipolar Switch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 4.5mT Trip, 0.5mT 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23 (Type S)
AH3322-SA-7 FAQ
1.How can I place an order for AH3322-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3322-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 AH3322-SA-7 reliable?
The price and inventory of AH3322-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 AH3322-SA-7 is usually 5 days.
3.What payment methods are accepted for AH3322-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3322-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3322-SA-7?
AH3322-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3322-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 AH3322-SA-7?
For technical support, including AH3322-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3322-SA-7 requirements.
6.How does Aetrix verify that AH3322-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH3322-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 AH3322-SA-7 meets industry standards.
7.What is the process for return or replacement of AH3322-SA-7?
All AH3322-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3322-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 AH3322-SA-7 part is unused and in its original packaging.
Return procedure for AH3322-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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