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Diodes Incorporated AH3373-PG-B
- Part No.:
- AH3373-PG-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH3373-PG-B.pdf
- Description:
- MAGNETIC SWITCH UNIPOLAR 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,911
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Product details
Overview
AH3373-PG-B from Diodes Incorporated is a high-voltage, high-sensitivity Hall effect unipolar switch IC designed for proximity and position sensing in consumer home appliances and industrial systems. It operates from 3.0V to 28V, features ±55G operate point (BOP) and ±35G release point (BRP), includes chopper-stabilized architecture for temperature stability, and delivers open-drain output with 60mA continuous current capability - deployed in contactless flow meter and lid-open detection circuits.
For engineers reviewing the AH3373-PG-B datasheet, AH3373-PG-B pinout, AH3373-PG-B application, or AH3373-PG-B equivalent, this page provides verified functional identity, magnetic threshold behavior across temperature, package-specific polarity orientation, and real-world design implications of its Zener-clamped supply/output and reverse-blocking diode protection.
Technical Context
The AH3373 employs dynamic offset cancellation via chopper stabilization at 800kHz, enabling minimal switch-point drift (<±20G over −40°C to +125°C) and superior immunity to mechanical stress and thermal gradients. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, ensuring stable operation across the full 3.0–28V supply range.
Magnetic actuation is unipolar and package-dependent: SOT23 and SIP-3 require South pole applied to the part-marking side (BOP = +55G typ), while SC59 requires South pole on the non-marking side. Output transitions occur within 3.75µs response delay and settle with <1µs rise/fall times under 1kΩ/20pF load conditions.
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) | +55G typical - enables reliable switching with low-strength magnets at >3mm air gaps |
| Release Point (BRP) | +35G typical - provides 20G hysteresis to prevent chatter near threshold |
| Output Type | Open-drain N-channel MOSFET - requires external pull-up; sinks up to 60mA continuously |
| Operating Temperature | −40°C to +125°C - qualified for under-hood and motor-control environments |
| ESD Rating | HBM > 6kV - withstands handling and assembly without additional protection circuitry |
| Power-On Time | 10µs typical - ensures fast system readiness after power application |
Pinout & Package
Package: SIP-3 (Bulk Pack), 3-pin single-inline package with straight leads and top-side marking "3373". Pin 1 (VDD) and Pin 2 (GND) are adjacent; Pin 3 (OUTPUT) is isolated on the opposite end. Polarity sensitivity requires South pole applied to the part-marking side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Input for 3.0–28V supply; includes integrated reverse-blocking diode and Zener clamp (32V abs max) |
| 2 | GND | Reference ground for internal regulator and output stage; shared return path for all currents |
| 3 | OUTPUT | Open-drain output with 60mA sink capability and Zener clamp (28V); pulls low when B > BOP |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized architecture | 800kHz modulation eliminates offset drift, enabling <±0.2V output-on voltage variation over temperature |
| Package-specific magnetic polarity | SIP-3 (Bulk Pack) requires South pole on marked side - critical for correct actuation in PCB-mounted assemblies |
| Zener clamps on VDD and OUTPUT | 28V clamp on output and 32V transient rating on supply - suppresses inductive kickback and ESD transients |
| Reverse supply protection | Integrated blocking diode prevents damage from −28V reverse bias - eliminates need for external diode |
| Low leakage in off-state | <0.1µA output leakage at 28V - preserves battery life in always-on sensing nodes |
Applications
| Washing Machine Lid Detection | Industrial Flow Meter Sensing |
|---|---|
|
Use Scenario: Detect lid closure in front-load washing machines using magnet-actuated reed-switch replacement. IC Role / Device Role / Timing Role: Unipolar Hall switch providing clean digital ON/OFF signal synchronized to magnet proximity. Use Value: Eliminates mechanical wear, supports IPX4-rated sealed enclosures, and operates reliably across 12V–24V control rails. |
Use Scenario: Monitor turbine rotation in water/gas 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: 3.75µs response time enables accurate counting up to 260kHz (15.6M pulses/min), supporting Class C flow accuracy. |
| Smart Appliance Door Latch | Office Equipment Paper Jam Detection |
|
Use Scenario: Confirm secure latch engagement in smart ovens and dishwashers with magnetic striker plates. IC Role / Device Role / Timing Role: Proximity sensor verifying mechanical alignment before enabling heating elements. Use Value: ±55G BOP allows use of small, low-cost ferrite magnets; hysteresis prevents false triggers during vibration. |
Use Scenario: Detect paper presence at critical feed points in printers and copiers using embedded magnets on rollers. IC Role / Device Role / Timing Role: Position switch confirming roller rotation or paper edge passage. Use Value: −40°C to +125°C rating ensures function in hot internal environments; 6kV ESD withstands service technician handling. |
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 |
|---|---|---|---|
| AH3323 | Lower sensitivity (BOP = +70G typ), no reverse-blocking diode, 24V max supply | Requires stronger magnets; needs external reverse-protection diode in 24V+ systems | Select when cost sensitivity outweighs robustness requirements and magnet strength is guaranteed |
| AL3373 (Allegro) | Same BOP/BRP specs but SC-59-only packaging; lacks SIP-3 bulk option and Zener clamp on output | Not drop-in compatible for SIP-3 PCB footprints; requires redesign for output clamping | Choose only if SC-59 layout is fixed and external TVS can be added on output line |
Compared with AH3323 and AL3373, the AH3373-PG-B uniquely combines SIP-3 bulk packaging, integrated reverse-blocking diode, dual Zener clamps, and guaranteed 28V operation - making it the only option qualified for high-reliability, high-voltage, high-volume appliance manufacturing without supplemental protection components.
Availability
AH3373-PG-B is available at Aetrix Electronics and suitable for washing machine lid detection, industrial flow metering, smart appliance door latching, and office equipment paper jam sensing requiring stable component supply across automotive-grade temperature ranges and long production lifecycles.
Supply support for AH3373-PG-B 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 ICs, specializing in high-reliability signal integrity, power management, and sensing solutions for industrial and consumer markets.
The AH3373 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, maintenance-free position and proximity sensing in cost-sensitive, high-volume white goods and building automation systems.
FAQ
What magnetic polarity activates the AH3373-PG-B?
The AH3373-PG-B uses SIP-3 (Bulk Pack) packaging, which requires a South pole applied to the part-marking side to activate. This is confirmed in the datasheet's magnetic polarity diagram and differs from SC59 packages, where the South pole must face the non-marking side. Applying North pole or incorrect orientation yields no output transition.
Does AH3373-PG-B require an external pull-up resistor?
Yes - the AH3373-PG-B has an open-drain output and requires an external pull-up resistor (RL) to VDD. The datasheet recommends RL between 1kΩ and 10kΩ depending on speed and noise requirements; 1kΩ enables <1µs rise time with 20pF load capacitance, while higher values reduce power but increase susceptibility to noise.
Can AH3373-PG-B operate directly from a 24V industrial rail?
Yes - the AH3373-PG-B is rated for continuous operation from 3.0V to 28V, with absolute maximum supply voltage of 32V. Its internal bandgap regulator and chopper-stabilized core ensure stable switching thresholds across this full range, and the integrated Zener clamp protects against transients common in 24V PLC and motor-control environments.
Is AH3373-PG-B RoHS and halogen-free compliant?
Yes - AH3373-PG-B is fully RoHS 3 compliant (2015/863/EU), lead-free, and halogen- and antimony-free per Diodes' "Green" definition: <900ppm bromine, <900ppm chlorine (total Br+Cl <1500ppm), and <1000ppm antimony compounds. Compliance documentation is available via Diodes' quality portal.
AH3373-PG-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP
- 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:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH3373-PG-B FAQ
1.How can I place an order for AH3373-PG-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3373-PG-B 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 AH3373-PG-B reliable?
The price and inventory of AH3373-PG-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3373-PG-B is usually 5 days.
3.What payment methods are accepted for AH3373-PG-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3373-PG-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3373-PG-B?
AH3373-PG-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3373-PG-B 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 AH3373-PG-B?
For technical support, including AH3373-PG-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3373-PG-B requirements.
6.How does Aetrix verify that AH3373-PG-B is sourced from the original manufacturer or authorized distributors?
All AH3373-PG-B 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 AH3373-PG-B meets industry standards.
7.What is the process for return or replacement of AH3373-PG-B?
All AH3373-PG-B units undergo pre-shipment inspection (PSI). If there is an issue with AH3373-PG-B, 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 AH3373-PG-B part is unused and in its original packaging.
Return procedure for AH3373-PG-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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