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Diodes Incorporated AH3373-SA-7
- Part No.:
- AH3373-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3373-SA-7.pdf
- Description:
- MAGNETIC SWITCH UNIPOLAR SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,771
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Product details
Overview
AH3373-SA-7 from Diodes Incorporated is a high-voltage, high-sensitivity Hall effect unipolar switch IC in SOT23 package, designed for proximity and position sensing in consumer home appliances and industrial systems. It operates from 3.0V to 28V, features BOP/BRP of +55G/+35G typical, open-drain output with 30–55mA current limit, and functions reliably from −40°C to +125°C.
For engineers reviewing the AH3373-SA-7 datasheet, AH3373-SA-7 pinout, AH3373-SA-7 application, or AH3373-SA-7 equivalent, key selection considerations include magnetic polarity dependency on package orientation, chopper-stabilized temperature stability, Zener clamping on VDD/output, reverse blocking diode integration, and compatibility with 10nF–100nF bypass capacitors for noise immunity.
Technical Context
The AH3373 employs chopper-stabilized architecture with dynamic offset cancellation to suppress thermal drift and mechanical stress effects, delivering ±20G hysteresis (BHY) and <3.75µs response delay across −40°C to +125°C. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, enabling stable operate/release thresholds independent of supply voltage variation.
It integrates reverse-blocking diode protection on VDD, Zener clamps on both supply and output pins, and overcurrent limiting (IOCL = 30–55mA), allowing direct interface with 3.3V/5V/24V logic systems without external protection components. Magnetic actuation requires South pole applied to the part-marking side for SOT23 packages like AH3373-SA-7.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - supports wide-input industrial and appliance power rails without external regulators |
| Operate Point (BOP) | +55G typical - enables reliable detection with low-strength magnets or increased air gaps |
| Release Point (BRP) | +35G typical - provides 20G hysteresis to prevent chatter near threshold |
| Output Type | Open-drain with 60mA absolute max continuous current - compatible with standard pull-up resistors and microcontroller inputs |
| Response Delay | 3.75µs typical - ensures fast switching for real-time position feedback in motor control or flow metering |
| ESD Rating | HBM >6kV - eliminates need for external ESD protection in typical PCB layouts |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive accessories and industrial enclosures |
Pinout & Package
Package: SOT23 - surface-mount, 3-pin, lead-free, RoHS-compliant package with 1.30mm body width and 2.90mm length; optimized for automated assembly and space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Positive supply input | Accepts 3.0–28V; includes integrated reverse-blocking diode and Zener clamp for transient protection |
| 2 (GND) | Ground reference | Common return path for internal circuitry and output stage; must be low-impedance for stable operation |
| 3 (OUTPUT) | Open-drain output | Sinks up to 55mA when active; requires external pull-up; includes Zener clamp and overcurrent limiting |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized architecture | Reduces thermal drift of BOP/BRP to ±14G over full temperature range, eliminating calibration in production |
| Integrated reverse-blocking diode | Enables safe operation with reversed supply connections up to −32V without external diode |
| Zener clamps on VDD and OUTPUT | Clamps transients to ≤28V on supply and output pins, protecting against inductive kickback and EFT events |
| High sensitivity unipolar switching | Detects South pole only at part-marking side (SOT23), simplifying mechanical design vs. bipolar alternatives |
| Low start-up time | 10µs power-on delay ensures immediate readiness after power application - critical for battery-powered devices |
Applications
| Washing Machine Lid Detection | Smart Thermostat Position Sensing |
|---|---|
|
Use Scenario: Detecting lid closure in top-loading washing machines using magnet-actuated reed switch replacement. IC Role / Device Role / Timing Role: Unipolar Hall switch providing digital ON/OFF signal when magnet approaches marking-side surface of SOT23 package. Use Value: Eliminates mechanical wear and contact bounce; operates reliably at 24V DC supply with no additional protection components. |
Use Scenario: Monitoring rotary encoder position in HVAC control dials to determine setpoint adjustment direction. IC Role / Device Role / Timing Role: Proximity sensor detecting magnet rotation via alternating South-pole exposure to SOT23 top surface. Use Value: Delivers sub-4µs response for accurate pulse counting at dial speeds up to 5 rps; immune to ambient EMI in residential environments. |
| Industrial Flow Meter Impeller Counting | Power Tool Safety Interlock |
|
Use Scenario: Counting ferrous impeller blades in liquid flow meters installed in chemical processing lines. IC Role / Device Role / Timing Role: High-voltage Hall switch interfacing directly to 24V PLC input with open-drain output pulled to 24V. Use Value: Withstands 28V transients and −40°C to +125°C ambient, enabling deployment in unheated outdoor meter housings. |
Use Scenario: Verifying guard door closure before enabling motor drive in cordless angle grinders and saws. IC Role / Device Role / Timing Role: Safety-critical unipolar switch asserting "safe" state only when South pole is present at marked side of SOT23. Use Value: HBM >6kV rating prevents false trips from static discharge during tool handling; Zener clamps suppress motor commutation noise. |
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 |
|---|---|---|---|
| AH3372-SA-7 | Lower sensitivity: BOP/BRP = +70G/+50G typical; same package, voltage range, and temperature rating | Better suited for high-air-gap or high-temperature-stable applications where stronger magnets are available | Select when magnetic field strength exceeds 70G and tighter hysteresis control is needed |
| US1881LUA-AB3-B | Higher supply current (5mA typ), no reverse-blocking diode, BOP/BRP = +35G/+25G typical | Lacks integrated reverse polarity protection; requires external diode for robustness in field-repairable equipment | Choose only if cost is primary constraint and board-level protection is already implemented |
Compared with AH3373-SA-7, AH3372-SA-7 trades sensitivity for improved noise margin in high-interference environments, while US1881LUA-AB3-B reduces system BOM count only when external protection is unnecessary - making AH3373-SA-7 optimal for new designs requiring integrated robustness and wide-voltage flexibility.
Availability
AH3373-SA-7 is available at Aetrix Electronics and suitable for washing machine lid detection, smart thermostat position sensing, industrial flow meter impeller counting, and power tool safety interlock applications requiring stable component supply across extended temperature and voltage ranges.
Supply support for AH3373-SA-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, industry-standard components for power management, signal integrity, and sensing applications.
AH3373 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, maintenance-free position and proximity sensing in harsh industrial and consumer appliance environments.
FAQ
What magnetic polarity activates the AH3373-SA-7?
The AH3373-SA-7 is activated by the South pole applied to the part-marking side of the SOT23 package. This polarity requirement is fixed for SOT23 and differs from SC59, where the South pole must face the non-marking side. No North pole actuation occurs - ensuring unambiguous switching behavior in mixed-magnet environments.
Can AH3373-SA-7 operate directly from a 24V industrial rail without external protection?
Yes. AH3373-SA-7 integrates a reverse-blocking diode on VDD and Zener clamps on both VDD and OUTPUT pins, rated for 32V transient stress. It draws only 3.5mA typical supply current at 24V and delivers 55mA sink capability - enabling direct connection to 24V PLC inputs with only a pull-up resistor and optional 10nF–100nF bypass capacitor.
How does chopper stabilization improve performance over conventional Hall switches?
Chopper stabilization in AH3373-SA-7 dynamically cancels offset voltage drift caused by temperature gradients and mechanical stress, reducing BOP/BRP variation to ±14G over −40°C to +125°C. This eliminates manual calibration, improves repeatability in mass production, and maintains consistent hysteresis without external compensation networks.
Is AH3373-SA-7 suitable for safety-critical interlock applications?
AH3373-SA-7 meets functional requirements for non-safety-certified interlocks (e.g., power tool guards) due to its HBM >6kV ESD rating, Zener clamps, reverse-blocking diode, and guaranteed −40°C to +125°C operation. However, it is not ASIL-B or IEC 61508 certified; system-level validation and redundancy remain the designer's responsibility per Diodes' Important Notice.
AH3373-SA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AH3373-SA-7 FAQ
1.How can I place an order for AH3373-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3373-SA-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 AH3373-SA-7 reliable?
The price and inventory of AH3373-SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3373-SA-7 is usually 5 days.
3.What payment methods are accepted for AH3373-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3373-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3373-SA-7?
AH3373-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3373-SA-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 AH3373-SA-7?
For technical support, including AH3373-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3373-SA-7 requirements.
6.How does Aetrix verify that AH3373-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH3373-SA-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 AH3373-SA-7 meets industry standards.
7.What is the process for return or replacement of AH3373-SA-7?
All AH3373-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3373-SA-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 AH3373-SA-7 part is unused and in its original packaging.
Return procedure for AH3373-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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