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Diodes Incorporated AH3373-P-B
- Part No.:
- AH3373-P-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH3373-P-B.pdf
- Description:
- MAGNETIC SWITCH UNIPOLAR 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:517
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Product details
Overview
AH3373-P-B from Diodes Incorporated is a high-voltage, high-sensitivity Hall effect unipolar switch IC in SIP-3 (Bulk Pack) package, designed for contactless position and level sensing in home appliances and industrial equipment. It operates from 3.0V to 28V, features ±55G/±35G typical operate/release points, open-drain output with 30–55mA current limit, and supports -40°C to +125°C operation.
For engineers reviewing the AH3373-P-B datasheet, AH3373-P-B pinout, AH3373-P-B application, or AH3373-P-B equivalent, key selection criteria include magnetic sensitivity tolerance over temperature, supply voltage range compatibility with 24V industrial rails, open-drain drive capability into external pull-up networks, and SIP-3 bulk-pack suitability for high-volume assembly.
Technical Context
The AH3373 employs chopper-stabilized architecture with dynamic offset cancellation to suppress thermal drift and mechanical stress-induced errors, enabling stable switching thresholds across -40°C to +125°C. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, ensuring consistent BOP/BRP performance independent of VDD variation.
Magnetic polarity response is package-dependent: for SIP-3 (Bulk Pack), a South pole applied to the part-marking side triggers turn-on (BOP = +55G typ), while North fields or absence of field maintain output high. Hysteresis of 20G typ prevents chatter near threshold transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - Enables direct interface with 24V industrial control rails without external regulation. |
| Operate Point (BOP) | +55G typical - Detects weak magnetic fields from small or distant magnets in compact appliance designs. |
| Release Point (BRP) | +35G typical - Provides 20G hysteresis to reject noise and prevent false toggling during slow field transitions. |
| Output Type | Open-drain N-channel - Allows flexible pull-up to any voltage ≤32V and wired-OR logic integration. |
| Output Current Limit | 30–55mA - Protects internal switch and external load against sustained short-circuit conditions. |
| Power-On Time | 10µs typical - Ensures rapid system readiness after power application, critical for real-time sensing loops. |
| ESD Rating | HBM >6kV - Supports robust handling and assembly in non-ESD-controlled manufacturing environments. |
Pinout & Package
Package: SIP-3 (Bulk Pack), straight-lead, through-hole mounting. Dimensions: 14.5mm × 3.0mm × 1.5mm (L×W×H), 3-pin configuration with 2.54mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Positive supply input - Accepts 3.0V–28V; includes reverse-blocking diode and Zener clamp for transient protection. |
| 2 | GND | Ground reference - Shared return path for internal circuitry and output stage; must be low-impedance. |
| 3 | OUTPUT | Open-drain output - Sinks up to 55mA when active; requires external pull-up resistor for logic-level translation. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper stabilization | Reduces thermal drift of BOP/BRP to ±14G over full temperature range, eliminating manual calibration. |
| Zener clamps on VDD and OUTPUT | Clamp transients to ≤28V on supply and ≤32V on output, enabling use in electrically noisy industrial environments. |
| Reverse blocking diode | Withstands -32V reverse supply voltage, preventing damage from accidental battery reversal or wiring faults. |
| High ESD immunity | HBM >6kV rating allows safe handling and reflow soldering without dedicated ESD mitigation in production. |
| Lead-free & halogen-free | Meets RoHS 3 (2015/863/EU) and Diodes' "Green" standard (<900ppm Br+Cl, <1000ppm Sb), supporting eco-compliant product design. |
Applications
| Washing Machine Lid Detection | Coffee Maker Water Tank Level Sensing |
|---|---|
|
Use Scenario: Detect lid closure via magnet embedded in hinge mechanism during spin cycle. IC Role / Device Role / Timing Role: Unipolar Hall switch providing fail-safe open/closed status to MCU with no moving contacts. Use Value: Eliminates mechanical microswitch wear and moisture ingress risk; SIP-3 bulk pack enables cost-effective wave soldering at scale. |
Use Scenario: Monitor water level in removable tank using vertical magnet array and fixed AH3373-P-B sensor. IC Role / Device Role / Timing Role: Proximity detector triggering refill alert when lowest magnet passes sensor position. Use Value: 3.0V–28V operation accommodates variable battery or adapter input; ±35G BRP ensures clean release without bounce. |
| Industrial Conveyor Belt Position Monitoring | Smart Toothbrush Brush Head Recognition |
|
Use Scenario: Sense gear tooth passage on rotating shaft to verify belt motion and detect stall. IC Role / Device Role / Timing Role: High-speed magnetic threshold detector with 3.75µs response time and 10µs power-on latency. Use Value: Chopper stabilization maintains timing accuracy across ambient shifts from 0°C to 60°C in factory settings. |
Use Scenario: Identify interchangeable brush heads by detecting unique magnet orientation patterns. IC Role / Device Role / Timing Role: Low-power proximity identifier operating from 3.0V coin cell with 4mA max supply current. Use Value: SIP-3 footprint allows compact PCB layout; 6kV ESD rating survives repeated hand handling and cleaning cycles. |
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 |
|---|---|---|---|
| AH3373-SA-7 | SOT23 package, tape-and-reel packaging, same electrical specs and magnetic thresholds. | Requires surface-mount reflow process; smaller footprint but lower power dissipation (230mW vs 550mW). | Select for space-constrained PCBs where thermal load is low and automated pick-and-place is available. |
| AH3323-P-B | Lower sensitivity (BOP = +90G typ), wider hysteresis (30G), identical SIP-3 bulk packaging and voltage range. | Better noise immunity in high-vibration environments but requires stronger magnets or closer spacing. | Select when magnetic field strength is inconsistent or mechanical tolerances exceed ±0.5mm alignment budget. |
Compared with AH3373-SA-7 and AH3323-P-B, AH3373-P-B uniquely balances high sensitivity, SIP-3 thermal robustness (550mW at 25°C), and bulk-pack cost efficiency for high-volume through-hole appliance manufacturing.
Availability
AH3373-P-B is available at Aetrix Electronics and suitable for washing machine lid detection, coffee maker water tank level sensing, industrial conveyor belt monitoring, and smart toothbrush brush head recognition requiring stable component supply across consumer and industrial production cycles.
Supply support for AH3373-P-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 analog ICs, specializing in high-reliability, application-optimized components for industrial, automotive, and consumer markets.
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 control systems.
FAQ
What is the magnetic polarity requirement for AH3373-P-B activation?
For AH3373-P-B in SIP-3 (Bulk Pack), a South pole must be presented to the part-marking side to activate the output. The device remains off under North pole fields or zero field. This polarity behavior is fixed per package type and cannot be inverted via external circuitry.
Can AH3373-P-B drive an LED directly without an external transistor?
Yes - with a properly sized series resistor, AH3373-P-B can sink up to 55mA continuously. For a 5V pull-up and red LED (VF ≈ 1.8V), a 100Ω resistor limits current to ~32mA, staying within both output and LED ratings. Always verify thermal derating at elevated ambient temperatures using the SIP-3 power dissipation curve.
Does AH3373-P-B require an external bypass capacitor?
Yes - a 10nF to 100nF ceramic capacitor between VDD and GND is recommended per the datasheet to stabilize the internal regulator and improve RF noise immunity. Omitting it may cause erratic switching in electrically noisy environments such as motor-driven appliances.
Is AH3373-P-B qualified for automotive applications?
No - AH3373-P-B is specified for industrial and consumer applications only, with AEC-Q100 qualification not claimed. Its -40°C to +125°C operating range overlaps automotive cabin requirements, but it lacks automotive-specific validation (e.g., PPAP, fault injection testing) and is not listed in Diodes' AEC-Q100 portfolio.
AH3373-P-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Unipolar Switch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 5.5mT Trip, 3.5mT Release
- Test Condition:
- -40°C ~ 125°C
- Voltage - Supply:
- 3V ~ 28V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 55mA
- Output Type:
- Open Drain
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH3373-P-B FAQ
1.How can I place an order for AH3373-P-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3373-P-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-P-B reliable?
The price and inventory of AH3373-P-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-P-B is usually 5 days.
3.What payment methods are accepted for AH3373-P-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3373-P-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3373-P-B?
AH3373-P-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3373-P-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-P-B?
For technical support, including AH3373-P-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3373-P-B requirements.
6.How does Aetrix verify that AH3373-P-B is sourced from the original manufacturer or authorized distributors?
All AH3373-P-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-P-B meets industry standards.
7.What is the process for return or replacement of AH3373-P-B?
All AH3373-P-B units undergo pre-shipment inspection (PSI). If there is an issue with AH3373-P-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-P-B part is unused and in its original packaging.
Return procedure for AH3373-P-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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