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Diodes Incorporated AH3326-W-7
- Part No.:
- AH3326-W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3326-W-7.pdf
- Description:
- HALL UNIPOLAR SWITCH SC59 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:3,165
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Product details
Overview
AH3326-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 BOP = 100 G (typ), BRP = 85 G (typ), and delivers open-drain output with 60 mA continuous current capability and 0.2 V typical on-state voltage at 20 mA.
For engineers reviewing the AH3326-W-7 datasheet, AH3326-W-7 pinout, AH3326-W-7 application, or AH3326-W-7 equivalent, this page provides verified magnetic thresholds, thermal derating curves, chopper-stabilized architecture details, and SC59-specific polarity orientation - critical for contactless switch design in high-temperature, high-noise environments.
Technical Context
The AH3326-W-7 uses chopper-stabilized architecture with dynamic offset cancellation to achieve minimal switch-point drift (<±10 G over –40°C to +125°C) and superior temperature stability. Its internal bandgap regulator supplies temperature-compensated bias to all subcircuits, enabling reliable operation across the full 3.0V–28V supply range.
It implements unipolar switching logic: South-pole activation (to non-marking side for SC59), with hysteresis of 15 G (typ). The single open-drain output includes overcurrent limiting (30–55 mA), zener clamps on VDD and OUTPUT pins, and reverse-blocking diode protection - eliminating need for external protection components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| BOP (Operate Point) | 100 G typical - triggers output low when South pole exceeds this flux density at non-marking side of SC59 package |
| BRP (Release Point) | 85 G typical - releases output (high-Z) only after flux drops below this level, providing noise-immune hysteresis |
| VDD Range | 3.0 V to 28 V - supports direct connection to 24 V industrial rails without external regulation |
| VOUT_ON | 0.2 V typical at 20 mA - ensures low power dissipation and compatible with 3.3 V/5 V logic pull-ups |
| Operating Temp | –40°C to +125°C - validated for use in sealed motor housings and heated appliance enclosures |
| ESD HBM | 8 kV - withstands handling and assembly stress without latch-up or parametric shift |
| Response Time | 4 µs typical - enables detection of fast-moving targets (e.g., rotating blades, actuator arms) |
Pinout & Package
SC59 package: 3-pin surface-mount, 3.0 mm × 2.9 mm body, 0.95 mm height, lead-free and RoHS-compliant. Pin 1 (VDD) and Pin 2 (GND) are adjacent; Pin 3 (OUTPUT) is diagonally opposite.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power input with integrated reverse-blocking diode and zener clamp (–18 V reverse, 32 V transient) |
| 2 | GND | Reference ground for internal regulator and Hall sensor - requires low-impedance PCB return path |
| 3 | OUTPUT | Open-drain output with 60 mA continuous rating, 30–55 mA current limit, and 28 V zener clamp |
Key Features
| Feature | Design Value |
|---|---|
| Chopper stabilization | Reduces thermal drift to <±0.05 G/°C and eliminates mechanical stress-induced offset shifts |
| Unipolar South-pole activation (SC59) | Requires magnet on non-part-marking side - simplifies mechanical mounting vs. bipolar alternatives |
| Integrated protection | Eliminates need for external TVS, reverse-polarity diode, or output current-limiting resistor |
| RF noise immunity | Validated against 100 MHz–1 GHz radiated fields per IEC 61000-4-3 - no external filtering required |
| Low startup time | 10 µs typical power-on delay - enables rapid system wake-up in battery-powered devices |
Applications
| Washing Machine Lid Detection | Cordless Power Tool Trigger Sensing |
|---|---|
|
Use Scenario: Detect lid closure in top-load washing machines using a magnet embedded in the lid hinge. IC Role / Device Role / Timing Role: Unipolar Hall switch activates output when lid closes (South pole approaches non-marking side of SC59). Use Value: Eliminates mechanical microswitch wear; operates reliably at 90°C ambient inside sealed control panel. |
Use Scenario: Sense trigger pull in cordless drills via magnet mounted on moving trigger lever. IC Role / Device Role / Timing Role: Provides immediate, bounce-free digital signal to MCU upon trigger actuation (4 µs response). Use Value: Enables precise PWM control of motor speed; survives repeated 24 V battery transients due to integrated zener clamps. |
| Smart Thermostat Fan Speed Control | Industrial Flow Meter Rotor Position |
|
Use Scenario: Monitor fan rotation in HVAC systems using magnet on fan hub and AH3326-W-7 mounted on PCB. IC Role / Device Role / Timing Role: Generates tachometer pulses via open-drain output pulled up to 5 V MCU rail. Use Value: 100 G operate point rejects stray field interference from nearby motors; operates down to 3.0 V during brownout conditions. |
Use Scenario: Detect rotor vane passage in water/gas flow meters with magnets embedded in impeller blades. IC Role / Device Role / Timing Role: Outputs clean, hysteresis-filtered pulse train synchronized to rotor position (BOP/BRP = 100/85 G). Use Value: Chopper stabilization maintains ±5% pulse timing accuracy across –40°C to +125°C - critical for volumetric calibration. |
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 |
|---|---|---|---|
| AL3326EUA-7 | Same BOP/BRP specs but SOT23-3 package; lacks reverse-blocking diode and zener clamp on VDD | Requires external reverse-protection diode and VDD TVS - increases BOM count and board area | Select if footprint space is constrained and external protection is already present |
| US1881LUA-7 | Lower sensitivity (BOP = 35 G typ); no chopper stabilization; 30 V abs max VDD | Higher susceptibility to thermal drift (>±0.2 G/°C) and mechanical stress - unsuitable for sealed motor assemblies | Select only for cost-sensitive, room-temperature consumer applications with stable magnetic fields |
Compared with AL3326EUA-7 and US1881LUA-7, the AH3326-W-7 delivers integrated protection, superior thermal stability, and SC59's higher power dissipation (230 mW at 25°C), making it optimal for industrial-grade contactless switching where reliability and reduced component count are prioritized.
Availability
AH3326-W-7 is available at Aetrix Electronics and suitable for washing machine lid detection, cordless tool trigger sensing, smart thermostat fan monitoring, and industrial flow meter rotor position sensing requiring stable component supply across extended temperature and voltage ranges.
Supply support for AH3326-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 company specializing in discrete, analog, and mixed-signal solutions, with emphasis on high-reliability, energy-efficient components for industrial and automotive markets.
The AH332X series belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, maintenance-free position and proximity sensing in harsh environments - targeting home appliance, power tool, and building automation applications.
FAQ
What is the correct magnet orientation for AH3326-W-7 in SC59 package?
The AH3326-W-7 in SC59 package requires the South pole to be applied to the non-part-marking side of the package to activate the output. This is explicitly defined in the datasheet's magnetic characteristics table and differs from SOT23/SIP-3 variants, which require South pole on the marking side. Mounting orientation must follow this polarity to ensure reliable switching.
Does AH3326-W-7 require an external pull-up resistor?
Yes - the AH3326-W-7 has an open-drain output and requires an external pull-up resistor (RL) connected between VDD and the OUTPUT pin. The recommended value is 1 kΩ for standard logic interfacing; values from 1 kΩ to 10 kΩ are acceptable depending on rise time and power requirements. No internal pull-up is provided.
Can AH3326-W-7 operate directly from a 24 V industrial supply?
Yes - the AH3326-W-7 is rated for continuous operation from 3.0 V to 28 V, making it fully compatible with nominal 24 V DC industrial rails. Its internal bandgap regulator and chopper-stabilized architecture maintain stable switching thresholds across this full range without external regulation.
How does the chopper stabilization improve performance over conventional Hall switches?
Chopper stabilization in the AH3326-W-7 actively cancels offset voltage drift caused by temperature gradients and mechanical stress, reducing BOP/BRP variation to <±10 G over –40°C to +125°C. This eliminates false triggering in thermally cycling environments and removes the need for system-level calibration during production.
AH3326-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
AH3326-W-7 FAQ
1.How can I place an order for AH3326-W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3326-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 AH3326-W-7 reliable?
The price and inventory of AH3326-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 AH3326-W-7 is usually 5 days.
3.What payment methods are accepted for AH3326-W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3326-W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3326-W-7?
AH3326-W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3326-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 AH3326-W-7?
For technical support, including AH3326-W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3326-W-7 requirements.
6.How does Aetrix verify that AH3326-W-7 is sourced from the original manufacturer or authorized distributors?
All AH3326-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 AH3326-W-7 meets industry standards.
7.What is the process for return or replacement of AH3326-W-7?
All AH3326-W-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3326-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 AH3326-W-7 part is unused and in its original packaging.
Return procedure for AH3326-W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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