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Diodes Incorporated AH373-WL-7
- Part No.:
- AH373-WL-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH373-WL-7.pdf
- Description:
- MAGNETIC SWITCH LATCH SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,602
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Product details
Overview
AH373-WL-7 from Diodes Incorporated is a bipolar Hall-effect latch sensor with integrated pull-up resistor, designed for high-temperature rotor position sensing and motor commutation. It operates from 2.2V to 20V, delivers 25mA sink current, features ±30G typical operate/release points (Bop/Brp), and functions across –40°C to +125°C in SC59 package.
For engineers reviewing the AH373-WL-7 datasheet, AH373-WL-7 pinout, AH373-WL-7 application, or AH373-WL-7 equivalent, key selection criteria include magnetic hysteresis (60G), internal band-gap regulation, output saturation voltage (≤400mV @20mA), and SIP-3/SC59/SOT23 package compatibility for PCB layout flexibility.
Technical Context
The AH373-WL-7 implements a monolithic Hall latch architecture with on-chip Hall plate, amplifier, comparator with built-in hysteresis, and open-drain output driver with 10kΩ nominal internal pull-up. Its band-gap regulator ensures stable internal biasing across supply and temperature variations.
Magnetic switching is polarity-dependent per package type: SC59 requires north pole toward marking side for turn-on; SIP-3 and SOT23 require south pole. Output remains latched until magnetic reversal crosses Brp, enabling robust noise immunity in EMI-prone motor environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2V–20V operating; enables direct connection to 12V automotive or industrial rails without external regulation |
| Output Sink Current | 25mA max; drives standard logic inputs or small-signal MOSFET gates directly |
| Operating Temperature | –40°C to +125°C; qualified for under-hood automotive and industrial motor control environments |
| Magnetic Hysteresis | 60G typical; prevents chatter during slow or noisy field transitions near Bop/Brp thresholds |
| Output Saturation Voltage | ≤400mV @20mA; ensures clean low-state logic level into 5V or 3.3V CMOS inputs |
| Internal Pull-up Resistor | 10kΩ nominal; eliminates need for external pull-up, reducing BOM count and board space |
Pinout & Package
AH373-WL-7 is supplied in SC59 package - a 3-pin surface-mount package with gull-wing leads, 2.8mm × 2.9mm footprint, and 0.95mm height. Pin 1 = VDD, Pin 2 = GND, Pin 3 = OUTPUT (open-drain).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Positive supply input | Accepts 2.2–20V; powers internal regulator, Hall plate, and output stage |
| 2 (GND) | Reference ground | Return path for supply current and output sink current; must be low-impedance |
| 3 (OUTPUT) | Open-drain digital output | Sinks up to 25mA when active; pulled high internally to VDD via 10kΩ resistor |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | Requires alternating north/south magnetic poles to toggle state - ideal for rotary position detection with magnetized gears |
| Integrated 10kΩ pull-up | Reduces external component count and PCB area; eliminates risk of incorrect external resistor selection |
| Wide supply range (2.2–20V) | Supports direct interface with 3.3V microcontrollers, 5V logic, and 12V/24V motor control rails |
| High-temperature operation (–40°C to +125°C) | Validated for continuous use in motor housings, HVAC blowers, and industrial actuators |
Applications
| Motor Commutation Sensing | Rotary Encoder Interface |
|---|---|
Use Scenario: Detecting rotor position in 3-phase BLDC motors for electronic commutation timing. IC Role / Device Role / Timing Role: Digital position feedback element providing synchronized edge-triggered signals to motor gate driver logic. Use Value: Enables precise 120° electrical phase alignment with <60G hysteresis, minimizing torque ripple and acoustic noise. | Use Scenario: Converting mechanical rotation of shafts or wheels into quadrature or index pulse streams. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector generating clean, debounced digital pulses per pole transition. Use Value: Delivers 25mA sink drive into optocoupler or MCU GPIO, supporting >10kHz RPM measurement with no external conditioning. |
| RPM Monitoring System | Contactless Current Switch |
Use Scenario: Measuring rotational speed of fans, pumps, or conveyors in HVAC and factory automation. IC Role / Device Role / Timing Role: Pulse generator whose frequency correlates linearly with shaft speed; interfaced to timer/counters. Use Value: Operates reliably at 125°C ambient, eliminating thermal drift errors common in thermally unstable hall sensors. | Use Scenario: Isolating high-current load control using magnetic field generated by conductor current (e.g., busbar sensing). IC Role / Device Role / Timing Role: Threshold-based magnetic switch activated by field strength proportional to load current magnitude. Use Value: Provides galvanic isolation and immunity to voltage transients, replacing mechanical relays in overcurrent protection circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL373-SR-7 | Same pinout, identical Bop/Brp specs, but uses SOT23-3 package and lacks internal pull-up resistor | Requires external 10kΩ pull-up; better suited for designs needing configurable output rise time or multi-drop wired-OR | Select when board layout allows extra resistor placement and system-level pull-up control is preferred |
| US1881EUA-AAA-000 | Higher Bop (50G min), lower hysteresis (30G), 20mA sink, same SC59 package | Less immune to field noise near threshold; optimized for high-speed gear tooth counting rather than motor commutation | Prefer for high-RPM encoders where fast response outweighs noise margin requirements |
Compared with AL373-SR-7 and US1881EUA-AAA-000, AH373-WL-7 uniquely combines internal pull-up, wide supply range, and 60G hysteresis - making it optimal for cost-sensitive, space-constrained motor control where reliability under EMI and thermal stress is critical.
Availability
AH373-WL-7 is available at Aetrix Electronics and suitable for motor commutation sensing, RPM monitoring, contactless current switching, and rotary encoder interface requiring stable component supply across automotive, industrial, and appliance applications.
Supply support for AH373-WL-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 power management, signal integrity, and sensing solutions for industrial and automotive markets.
The AH373 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust magnetic position detection in harsh thermal and electromagnetic environments - targeting BLDC motor control, fan speed regulation, and safety-critical motion feedback systems.
FAQ
What is the magnetic polarity requirement for AH373-WL-7 activation?
The AH373-WL-7 requires a south pole facing the marked side of SIP-3 and SOT23 packages, but a north pole facing the marked side of the SC59 package (as used in WL-7). This polarity dependency is defined by die orientation within each package type and must be verified during mechanical integration.
Can AH373-WL-7 operate below 2.5V supply?
AH373-WL-7 begins functional output switching above 2.2V, but its magnetic characteristics (Bop/Brp) are only guaranteed after VDD exceeds 2.5V. Below 2.5V, hysteresis and switching thresholds may shift unpredictably - so 2.5V is the minimum recommended supply for reliable sensing.
Is an external bypass capacitor required for AH373-WL-7?
Yes - a 100nF ceramic capacitor between VDD and GND is recommended per the datasheet to stabilize the internal regulator and improve noise immunity. Placement within 3mm of the SC59 pins is critical to maintain performance in electrically noisy motor environments.
Why is AH373-WL-7 marked "Not Recommended for New Design"?
AH373-WL-7 is designated NRND because Diodes Incorporated has introduced the AH3782 as its functional successor - offering improved temperature stability and tighter magnetic tolerances. However, AH373-WL-7 remains fully supported for existing designs and legacy production with no obsolescence timeline announced.
AH373-WL-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:
- Latch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 6mT Trip, -6mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 2.2V ~ 20V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 25mA
- Output Type:
- Open Drain
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH373-WL-7 FAQ
1.How can I place an order for AH373-WL-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH373-WL-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 AH373-WL-7 reliable?
The price and inventory of AH373-WL-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH373-WL-7 is usually 5 days.
3.What payment methods are accepted for AH373-WL-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH373-WL-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH373-WL-7?
AH373-WL-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH373-WL-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 AH373-WL-7?
For technical support, including AH373-WL-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH373-WL-7 requirements.
6.How does Aetrix verify that AH373-WL-7 is sourced from the original manufacturer or authorized distributors?
All AH373-WL-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 AH373-WL-7 meets industry standards.
7.What is the process for return or replacement of AH373-WL-7?
All AH373-WL-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH373-WL-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 AH373-WL-7 part is unused and in its original packaging.
Return procedure for AH373-WL-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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