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Diodes Incorporated AH3373-PG-A
- Part No.:
- AH3373-PG-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP, Formed Leads
- Datasheet:
-
AH3373-PG-A.pdf
- Description:
- MAGNETIC SWITCH UNIPOLAR 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,191
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Product details
Overview
AH3373-PG-A 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.
For engineers reviewing the AH3373-PG-A datasheet, AH3373-PG-A pinout, AH3373-PG-A application, or AH3373-PG-A equivalent, this device supports robust magnetic sensing in space-constrained, wide-supply industrial controls - especially where reverse polarity protection, ESD immunity (>6kV HBM), and -40°C to +125°C operation are required.
Technical Context
The AH3373 employs dynamic offset cancellation via chopper stabilization at 800kHz to suppress thermal drift and mechanical stress effects, ensuring stable BOP/BRP thresholds across temperature. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, enabling consistent switching behavior from -40°C to +125°C.
It integrates reverse-blocking diode, Zener clamps on VDD and OUTPUT pins, and output overcurrent limiting (30–55mA). Magnetic polarity response differs by package: SOT23/SIP-3 require south pole on marking side; SC59 requires south pole on non-marking side - confirmed in functional block diagram and pin assignment diagrams.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - enables direct interface with 12V/24V industrial rails without external regulators. |
| Operate Point (BOP) | +55G typical - detects weak magnetic fields from small or distant magnets in compact assemblies. |
| Release Point (BRP) | +35G typical - provides 20G hysteresis to prevent chatter near threshold in noisy environments. |
| Output Type | Open-drain, 60mA continuous - supports flexible pull-up configurations and direct interfacing with MCU GPIOs or logic inputs. |
| Start-up Time | 10µs typical - ensures rapid system readiness after power-on, critical for real-time position feedback loops. |
| ESD Rating | HBM >6kV - withstands handling and board-level ESD events without latch-up or parametric shift. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive-adjacent industrial enclosures and high-ambient appliance motors. |
Pinout & Package
Package: SC59 (standard for AH3373-PG-A), also available in SOT23 and SIP-3 variants. SC59 offers enhanced thermal performance (230mW at 25°C) and industry-standard footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Power supply input | Accepts 3.0–28V; includes integrated Zener clamp and reverse-blocking diode for transient and polarity protection. |
| 2 - GND | Ground reference | Common return for internal circuitry and output stage; must be low-impedance for stable chopper operation. |
| 3 - OUTPUT | Open-drain output | Sinks up to 60mA when active; requires external pull-up; includes Zener clamp and current limiting for fault resilience. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized architecture | 800kHz chopping frequency eliminates offset drift, reducing BOP/BRP variation to ±14G over full temperature range. |
| Unipolar magnetic response | Switches only with South pole - simplifies magnet orientation in mechanical assemblies and avoids false triggers from stray North fields. |
| Integrated protection network | Reverse-blocking diode + dual Zener clamps (VDD and OUTPUT) eliminate need for external TVS or polarity protection components. |
| High sensitivity at wide voltage range | BOP remains ±55G across 3V–28V supply - enables consistent detection performance regardless of rail fluctuations in battery or unregulated systems. |
| Lead-free & halogen-free | RoHS 3 (2015/863/EU) compliant with <900ppm Br/Cl and <1000ppm Sb - meets global environmental compliance for industrial OEM shipments. |
Applications
| Appliance Door Detection | Industrial Flow Meter Sensing |
|---|---|
|
Use Scenario: Detecting open/closed state of washing machine or dishwasher doors using embedded magnet and PCB-mounted sensor. IC Role / Device Role / Timing Role: Unipolar Hall switch providing clean, bounce-free digital signal to main controller upon door closure. Use Value: Eliminates mechanical microswitch wear; operates reliably through 100k+ cycles with no contact degradation or ESD-induced failure. |
Use Scenario: Monitoring turbine rotation in water/gas flow meters via magnet-embedded impeller passing sensor location. IC Role / Device Role / Timing Role: High-speed magnetic threshold detector generating pulse train proportional to flow rate. Use Value: 3.75µs response delay and 10µs start-up enable accurate low-flow measurement down to 0.1L/min with minimal latency. |
| Motorized Furniture Position Feedback | Smart HVAC Damper Control |
|
Use Scenario: Tracking extension/retraction position of electric lift tables or recliners using linear magnet array and fixed AH3373 mount. IC Role / Device Role / Timing Role: Proximity switch reporting discrete zone transitions (e.g., "fully extended", "mid-travel") to motor driver MCU. Use Value: ±55G sensitivity allows use of low-cost ferrite magnets; wide 3–28V range interfaces directly with 12V motor control boards. |
Use Scenario: Verifying blade position in automated HVAC duct dampers, confirming full open/closed states during actuation. IC Role / Device Role / Timing Role: End-of-travel confirmation sensor signaling damper limit positions to building management system. Use Value: -40°C to +125°C rating ensures operation in attic-mounted units; ESD >6kV prevents field failures during service technician handling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unipolar Hall switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3323 | Lower sensitivity (BOP = +70G typ), narrower supply range (3.0–24V), no reverse-blocking diode | Less suitable for weak-field or 28V industrial rails; requires external polarity protection | Select AH3323 only if cost is primary constraint and magnetic field strength exceeds 70G reliably. |
| AL3373 (Allegro) | Same BOP/BRP specs but lacks Zener clamp on OUTPUT; different pinout (VDD/GND/OUT vs. VDD/OUT/GND) | Not pin-compatible; requires PCB redesign; lower fault tolerance on output node | Choose AL3373 only if Allegro qualification requirements dominate and layout revision is acceptable. |
Compared with AH3323 and AL3373, the AH3373-PG-A uniquely combines 28V operation, integrated reverse-blocking diode, dual Zener clamps, and SC59 thermal performance - making it optimal for ruggedized, drop-in replacement in legacy 24V industrial designs requiring zero external protection components.
Availability
AH3373-PG-A is available at Aetrix Electronics and suitable for appliance door detection, industrial flow metering, motorized furniture position feedback, and smart HVAC damper control requiring stable component supply across extended temperature and voltage ranges.
Supply support for AH3373-PG-A 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 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 home appliance and industrial automation applications.
FAQ
What magnetic polarity activates the AH3373-PG-A?
The AH3373-PG-A is a unipolar switch activated exclusively by the South pole. For the SC59 package (used in PG-A), the South pole must be applied to the non-marking side of the package. This polarity requirement is fixed per package type and verified in the functional block diagram and magnetic characteristics table.
Does the AH3373-PG-A require an external pull-up resistor?
Yes - the AH3373-PG-A has an open-drain output and requires an external pull-up resistor (RL) to VDD. The recommended value is 1kΩ for standard timing; RL value directly affects output rise time (0.2–1µs typical with CL = 20pF), as specified in the Electrical Characteristics table.
Can the AH3373-PG-A operate from a 3.3V microcontroller rail?
Yes - the AH3373-PG-A is fully specified from 3.0V to 28V. At 3.3V, it maintains BOP = +55G and BRP = +35G typical, with supply current ≤3.5mA and output ON voltage ≤0.4V at 20mA load, enabling direct interfacing with 3.3V logic without level-shifting.
Is the AH3373-PG-A pin-compatible with other Diodes Hall switches like AH3363?
No - AH3373-PG-A uses SC59 package with VDD-GND-OUTPUT pinout, while AH3363 uses SOT23-3 with VDD-OUTPUT-GND arrangement. Pin mapping differs, and magnetic thresholds (BOP/BRP) are not identical; substitution requires both PCB layout and firmware logic review.
AH3373-PG-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP, Formed Leads
- Packaging:
- Tape & Box (TB)
- 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-A FAQ
1.How can I place an order for AH3373-PG-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3373-PG-A 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-A reliable?
The price and inventory of AH3373-PG-A 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-A is usually 5 days.
3.What payment methods are accepted for AH3373-PG-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3373-PG-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3373-PG-A?
AH3373-PG-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3373-PG-A 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-A?
For technical support, including AH3373-PG-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3373-PG-A requirements.
6.How does Aetrix verify that AH3373-PG-A is sourced from the original manufacturer or authorized distributors?
All AH3373-PG-A 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-A meets industry standards.
7.What is the process for return or replacement of AH3373-PG-A?
All AH3373-PG-A units undergo pre-shipment inspection (PSI). If there is an issue with AH3373-PG-A, 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-A part is unused and in its original packaging.
Return procedure for AH3373-PG-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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