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Diodes Incorporated AH372-P-B
- Part No.:
- AH372-P-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SSIP
- Datasheet:
-
AH372-P-B.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,921
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Product details
Overview
AH372-P-B from Diodes Incorporated is a bipolar Hall-effect latch sensor in SIP-3 (Bulk Pack) package, featuring internal pullup resistor, 2.2–20 V operating range, -40°C to +125°C temperature rating, and 25 mA output sink capability. It detects magnetic flux reversal to latch digital output-ON when B > BOP (5–60 Gauss), OFF when B < BRP (-60 to -5 Gauss)-and is used in motor commutation rotor position sensing.
For engineers reviewing the AH372-P-B datasheet, AH372-P-B pinout, AH372-P-B application, or AH372-P-B equivalent, key selection considerations include its built-in pullup resistor eliminating external components, wide supply voltage tolerance, high-temperature operation, and bipolar latching behavior with 60 Gauss typical hysteresis for robust noise immunity in industrial motion control systems.
Technical Context
The AH372 integrates a Hall plate, amplifier, comparator with hysteresis, and open-drain output driver with integrated 7–13 kΩ pullup resistor. Its bandgap regulator enables stable internal biasing across 2.2–20 V supply, supporting direct connection to automotive or industrial rails without external regulation.
Magnetic switching thresholds are polarity- and package-dependent: for SIP-3 (Bulk Pack), South pole toward marking side triggers turn-on at BOP ≥5 Gauss; release occurs at BRP ≤-5 Gauss under reverse field. Hysteresis (BHY) ensures immunity to mechanical vibration and EMI-induced false triggering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2 V to 20 V - supports direct interface with 3.3 V, 5 V, 12 V, and 24 V systems without level-shifting or regulation |
| Output Sink Current | 25 mA - drives standard logic inputs, optocouplers, or small relays directly without external buffer |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial motor control environments |
| Magnetic BOP / BRP | 5–60 G / -60 to -5 G - bipolar latching with ≥60 G hysteresis prevents chatter during slow or noisy field transitions |
| Internal Pullup Resistor | 7–13 kΩ - eliminates need for external pullup, reducing BOM count and PCB footprint |
| Output On Voltage | ≤400 mV @ 20 mA - ensures clean TTL/CMOS-compatible low-state even at full load current |
| Supply Current (Idle) | 2–4 mA - enables low-power operation in battery-backed or energy-sensitive applications |
Pinout & Package
AH372-P-B is supplied in SIP-3 (Bulk Pack) package with straight leads, 14.5 mm body length, 3.0 mm width, and 1.5 mm height. Pin 1 = VDD, Pin 2 = GND, Pin 3 = OUT - all leads are tin-plated copper with RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive power supply input | Accepts 2.2–20 V DC; powers internal regulator, Hall plate, and output stage |
| 2 - GND | Ground reference | Common return path for supply and output current; must be low-impedance for stable switching |
| 3 - OUT | Open-drain digital output | Sinks up to 25 mA; pulled low when B > BOP, high-impedance otherwise; internal pullup holds high state |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latching operation | Requires opposite-polarity magnetic field to reset output - enables position memory without continuous field presence |
| Integrated 7–13 kΩ pullup resistor | Reduces external component count by one resistor and associated layout area; simplifies design validation |
| 25 mA output sink capability | Directly interfaces with industry-standard logic families and discrete loads without buffering |
| Wide 2.2–20 V supply range | Eliminates need for dedicated LDO in multi-rail systems; compatible with battery, engine, and industrial supplies |
| -40°C to +125°C operation | Validated performance across full automotive under-hood and industrial motor drive thermal profiles |
Applications
| Motor Rotor Position Sensing | Rotary Encoder Feedback |
|---|---|
|
Use Scenario: Detecting magnetic pole transitions on BLDC motor rotors for electronic commutation timing. IC Role / Device Role / Timing Role: Digital latch providing synchronized edge-triggered signals to motor controller for phase switching. Use Value: Enables precise 120° electrical angle alignment with no contact wear, supporting >100k RPM operation and extended service life. |
Use Scenario: Converting rotational motion into quadrature or index pulse trains in industrial encoders. IC Role / Device Role / Timing Role: Bipolar latch generating clean, hysteresis-stabilized edges per pole pair passage. Use Value: Delivers jitter-free position pulses immune to mechanical bounce or EMI, improving encoder resolution accuracy by ≥3× vs. analog sensors. |
| RPM Monitoring in Harsh Environments | Contactless Current Switching |
|
Use Scenario: Measuring shaft speed in diesel engine camshafts or hydraulic pump drives exposed to oil, dust, and thermal cycling. IC Role / Device Role / Timing Role: Magnetic threshold detector converting gear tooth proximity into frequency-proportional pulse train. Use Value: Maintains reliable signal integrity at -40°C cold start and +125°C sustained operation without recalibration. |
Use Scenario: Isolating current flow detection in high-side power switches using magnetic field around conductor. IC Role / Device Role / Timing Role: Zero-contact switch triggered by field from current-carrying trace or busbar. Use Value: Eliminates insertion loss and thermal drift of shunt resistors while enabling sub-10 µs response to overcurrent events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3724 | Successor device with tighter BOP/BRP tolerance (±5 G), lower IDD (1.5 mA typ), and AEC-Q100 Grade 1 qualification | Required for new automotive designs; supports PPAP and IATF 16949 traceability | Select AH3724 for production releases requiring long-term availability and automotive compliance |
| AL372-S | Same functional spec but SC59 package; different magnetic polarity orientation (North pole activates) | Used where board layout or magnet mounting requires reversed field sensitivity | Choose AL372-S only when SIP-3 mechanical constraints prevent AH372-P-B placement |
Compared with AH372-P-B, AH3724 offers improved parametric consistency and automotive qualification for future designs, while AL372-S provides identical electrical behavior in a different package with inverted magnetic polarity-neither is pin-compatible nor drop-in, requiring layout and magnet orientation review.
Availability
AH372-P-B is available at Aetrix Electronics and suitable for motor commutation, RPM monitoring, rotary encoding, and contactless switching applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AH372-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 power management, signal integrity, and sensing solutions for industrial and automotive markets.
AH372 belongs to Diodes' Hall-effect sensor product line, engineered for robust magnetic position detection in harsh environments-designed specifically for motor control, safety-critical feedback, and maintenance-free motion sensing.
FAQ
What is the magnetic polarity requirement for AH372-P-B activation?
For AH372-P-B in SIP-3 (Bulk Pack), the South pole applied to the marked side of the package triggers output turn-on (B > BOP). Release occurs when the North pole exceeds BRP magnitude. This polarity orientation is fixed per package type and cannot be reversed via configuration.
Does AH372-P-B require an external bypass capacitor?
Yes-a 100 nF ceramic capacitor between VDD and GND is recommended per the datasheet to stabilize the internal regulator and improve noise immunity. Omitting it may cause erratic switching near BOP/BRP thresholds, especially in electrically noisy motor drive environments.
Can AH372-P-B drive an LED directly?
Yes-its 25 mA sink capability allows direct connection of a standard 2–20 mA LED between VDD and OUT, with current limited by the internal pullup resistor (7–13 kΩ) and forward voltage drop. For precise current control or higher brightness, an external series resistor is advised.
Is AH372-P-B qualified for automotive use?
No-AH372-P-B is not AEC-Q100 qualified. Diodes explicitly states it is "not recommended for new designs" and directs users to AH3724 for automotive applications requiring PPAP, change control, and IATF 16949 manufacturing.
AH372-P-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SSIP
- Packaging:
- Bulk
- Product Status:
- Last Time Buy
- Function:
- Latch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- 5mT Trip, -5mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 2.2V ~ 20V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 25mA
- Output Type:
- Digital
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH372-P-B FAQ
1.How can I place an order for AH372-P-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH372-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 AH372-P-B reliable?
The price and inventory of AH372-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 AH372-P-B is usually 5 days.
3.What payment methods are accepted for AH372-P-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH372-P-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH372-P-B?
AH372-P-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH372-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 AH372-P-B?
For technical support, including AH372-P-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH372-P-B requirements.
6.How does Aetrix verify that AH372-P-B is sourced from the original manufacturer or authorized distributors?
All AH372-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 AH372-P-B meets industry standards.
7.What is the process for return or replacement of AH372-P-B?
All AH372-P-B units undergo pre-shipment inspection (PSI). If there is an issue with AH372-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 AH372-P-B part is unused and in its original packaging.
Return procedure for AH372-P-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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