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Diodes Incorporated AH3322-W-7
- Part No.:
- AH3322-W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3322-W-7.pdf
- Description:
- HALL UNIPOLAR SWITCH SC59 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,155
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Product details
Overview
AH3322-W-7 from Diodes Incorporated is a high-voltage, high-sensitivity Hall-effect unipolar switch IC in SC59 package, designed for proximity and position sensing in industrial appliances and personal care devices. It operates from 3.0V to 28V, features open-drain output with 30–55mA current limit, 30G typical operate point (BOP), and -40°C to +125°C operating range.
For engineers reviewing the AH3322-W-7 datasheet, AH3322-W-7 pinout, AH3322-W-7 application, or AH3322-W-7 equivalent, key selection considerations include magnetic polarity orientation (south pole to non-marking side for SC59), chopper-stabilized temperature stability, zener clamping on supply/output, reverse blocking diode, and robust 8kV HBM ESD rating.
Technical Context
The AH3322-W-7 uses chopper-stabilized architecture with dynamic offset cancellation to achieve minimal switch-point drift and superior thermal stability across -40°C to +125°C. Its internal bandgap regulator supplies temperature-compensated bias to all subcircuits, enabling consistent BOP/BRP performance over voltage (3.0–28V) and temperature.
Magnetic actuation is unipolar: output switches low when perpendicular flux exceeds BOP = 30G (typ), releases at BRP = 20G (typ), with 10G hysteresis. The SC59 package requires south-pole actuation on the non-part-marking side-distinct from SOT23/SIP-3 variants-and integrates reverse-blocking diode and zener clamps on VDD and OUTPUT pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - supports wide-input industrial power rails without external regulation |
| Operate Point (BOP) | 15G to 45G (typ 30G) - enables reliable detection with low-strength magnets in compact assemblies |
| Release Point (BRP) | 5G to 35G (typ 20G) - provides noise-immune hysteresis margin against false triggering |
| Output Type | Open-drain with 30–55mA current limit - directly drives standard pull-up loads up to 28V |
| Startup Time | 10µs typical - ensures rapid system readiness after power-on, critical for real-time sensing |
| ESD Rating (HBM) | 8kV - eliminates need for external ESD protection in consumer and industrial PCB layouts |
| Operating Temperature | -40°C to +125°C - qualified for under-hood, motor-control, and sealed-appliance environments |
Pinout & Package
SC59 package: 3-pin surface-mount, 3.0mm × 2.9mm body, 1.1mm max height, lead-free and RoHS compliant. Pin 1 (VDD) and Pin 2 (GND) are adjacent on one side; Pin 3 (OUTPUT) is on opposite end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power input with integrated reverse-blocking diode and zener clamp - tolerates -18V reverse transients and 32V surges |
| 2 | GND | Ground reference for internal bandgap regulator and Hall sensor - must be low-impedance for stable switching thresholds |
| 3 | OUTPUT | Open-drain output with 30–55mA current limit and zener clamp - sinks load current when active; requires external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized architecture | Reduces thermal drift of BOP/BRP to ±1.5G over full temperature range, eliminating calibration in production |
| Unipolar magnetic response | Single south-pole activation (non-marking side for SC59) simplifies mechanical design vs. bipolar alternatives |
| Integrated protection | Reverse-blocking diode + dual zener clamps (VDD and OUTPUT) eliminate 3 external protection components |
| RF noise immunity | Validated against IEC 61000-4-3 radiated immunity - maintains operation in noisy motor-drive or switching-power environments |
| Low quiescent current | 3–5mA supply current across -40°C to +125°C - enables battery-backed or energy-sensitive applications |
Applications
| Washing Machine Lid Detection | Smart Thermostat Position Sensing |
|---|---|
|
Use Scenario: Detect lid open/closed state in top-loading washing machines using magnet-mounted on lid and AH3322-W-7 mounted on chassis. IC Role / Device Role / Timing Role: Unipolar Hall switch providing fail-safe, contactless position feedback to MCU control logic. Use Value: SC59's robust 28V tolerance handles 24V PLC-level inputs; 125°C rating survives enclosed cabinet heat; 8kV ESD withstands service technician handling. |
Use Scenario: Sense rotary encoder position or damper actuator alignment in HVAC control modules. IC Role / Device Role / Timing Role: Magnetic proximity detector converting mechanical rotation into digital on/off signal for microcontroller polling. Use Value: 30G BOP allows use of small, low-cost ferrite magnets; chopper stabilization ensures consistent trip points across seasonal ambient shifts. |
| Electric Toothbrush Motor Commutation | Industrial Flow Meter Impeller Counting |
|
Use Scenario: Monitor brush head attachment via magnet presence in rechargeable oral care devices. IC Role / Device Role / Timing Role: Proximity sensor confirming accessory compatibility before enabling motor drive circuitry. Use Value: 3.0V minimum supply enables direct connection to Li-ion battery (3.2–4.2V); 10µs startup time supports instant-on user experience. |
Use Scenario: Detect rotating impeller blades in water/gas flow meters using embedded magnets and surface-mounted AH3322-W-7. IC Role / Device Role / Timing Role: High-reliability pulse generator for volumetric flow calculation in utility metering systems. Use Value: -40°C to +125°C range covers outdoor meter enclosures; SIP-3-compatible footprint allows drop-in replacement if needed; 550mW thermal rating sustains continuous operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect unipolar switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3322W-7 (Allegro) | BOP = 25G (min), BRP = 15G (min); no integrated reverse-blocking diode; 5.5V max VDD | Requires external reverse-protection diode and level-shifting for >5.5V systems | Select only for low-voltage (<6V), cost-sensitive designs where external protection is acceptable |
| US1881LUA-7 (Melexis) | BOP = 35G (min), BRP = 25G (min); push-pull output; 24V max VDD; no zener clamp on output | Eliminates external pull-up but lacks output zener protection - vulnerable to inductive kickback | Prefer where board space is constrained and load is resistive; avoid in relay/motor-driver proximity sensing |
Compared with AL3322W-7 and US1881LUA-7, AH3322-W-7 uniquely combines 28V operation, integrated reverse diode + dual zener clamps, and SC59 packaging - making it the only choice for high-voltage, high-reliability industrial proximity sensing without external protection components.
Availability
AH3322-W-7 is available at Aetrix Electronics and suitable for washing machine lid detection, smart thermostat position sensing, electric toothbrush accessory verification, and industrial flow meter impeller counting requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for AH3322-W-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 industrial, consumer, and automotive markets.
AH3322-W-7 belongs to the AH332X high-voltage Hall-effect switch family, engineered specifically for robust, maintenance-free position and proximity sensing in harsh environments where wide supply range, thermal stability, and integrated protection are mandatory.
FAQ
What magnetic polarity activates the AH3322-W-7 in SC59 package?
The AH3322-W-7 in SC59 package requires a south magnetic pole applied to the non-part-marking side of the package to activate. This is explicitly defined in the datasheet and differs from SOT23/SIP-3 variants, which require south pole on the marking side. Incorrect orientation results in no output switching.
Does AH3322-W-7 require an external pull-up resistor?
Yes - AH3322-W-7 has an open-drain output and requires an external pull-up resistor (RL) between VDD and OUTPUT. Typical values range from 1kΩ to 10kΩ depending on rise-time requirements and bus voltage. The datasheet recommends 10nF–100nF bypass capacitor (CIN) on VDD for noise immunity.
Can AH3322-W-7 operate directly from a 24V industrial rail?
Yes - AH3322-W-7 is rated for continuous operation from 3.0V to 28V, and its absolute maximum VDD is 32V. It includes an integrated reverse-blocking diode and zener clamp on the supply pin, enabling direct connection to 24V PLC or factory automation rails without external regulation or protection.
How does the chopper-stabilized architecture improve performance?
The chopper-stabilized architecture dynamically cancels offset voltage in the Hall sensor and amplifier chain, reducing BOP/BRP drift to ±1.5G over -40°C to +125°C. This eliminates manual calibration, ensures consistent switching thresholds across temperature swings, and improves long-term reliability in sealed or thermally cycling applications.
AH3322-W-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Technology:
- -
- Polarization:
- -
- Sensing Range:
- -
- Test Condition:
- -
- Voltage - Supply:
- -
- Current - Supply (Max):
- -
- Current - Output (Max):
- -
- Output Type:
- -
- Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH3322-W-7 FAQ
1.How can I place an order for AH3322-W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3322-W-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-W-7 reliable?
The price and inventory of AH3322-W-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-W-7 is usually 5 days.
3.What payment methods are accepted for AH3322-W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3322-W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3322-W-7?
AH3322-W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3322-W-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-W-7?
For technical support, including AH3322-W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3322-W-7 requirements.
6.How does Aetrix verify that AH3322-W-7 is sourced from the original manufacturer or authorized distributors?
All AH3322-W-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-W-7 meets industry standards.
7.What is the process for return or replacement of AH3322-W-7?
All AH3322-W-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3322-W-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-W-7 part is unused and in its original packaging.
Return procedure for AH3322-W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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