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Diodes Incorporated AH372-P-A
- Part No.:
- AH372-P-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SSIP
- Datasheet:
-
AH372-P-A.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,658
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Product details
Overview
AH372-P-A from Diodes Incorporated is a bipolar Hall-effect latch sensor with internal pullup resistor, designed for rotor position sensing and contactless switching in high-temperature motor control systems. It operates from 2.2V to 20V, delivers 25mA sink current, features ±30G typical magnetic operate/release points, and supports -40°C to +125°C operation in SIP-3 (Ammo Pack) package.
For engineers reviewing the AH372-P-A datasheet, AH372-P-A pinout, AH372-P-A application, or AH372-P-A equivalent, this device is selected for robust commutation feedback in BLDC motors, RPM monitoring circuits, and automotive-grade hall sensing where built-in pullup simplifies board layout and thermal stability is critical.
Technical Context
The AH372 integrates a Hall plate, chopper-stabilized amplifier, comparator with hysteresis, and open-drain output driver with integrated 10kΩ pullup resistor. Its bandgap-regulated internal supply ensures stable magnetic switching thresholds across voltage and temperature variations.
Magnetic response is bipolar: output switches low when south pole (SIP-3/SOT23) or north pole (SC59) exceeds BOP = 30G typ., and remains latched until reverse field falls below BRP = −30G typ., delivering 60G hysteresis for noise immunity in EMI-prone motor environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2V–20V - Enables direct connection to 12V/24V automotive or industrial rails without external regulation |
| Output Sink Current | 25mA - Drives standard logic inputs or small relays without external buffer |
| Operating Temperature | −40°C to +125°C - Qualified for under-hood and industrial motor control environments |
| Magnetic Hysteresis | 60G - Prevents chatter during slow or noisy magnetic transitions in encoder applications |
| Internal Pullup Resistor | 10kΩ typ. - Eliminates need for external pullup, reducing BOM count and PCB area |
| Output On Voltage | 400mV max @ 20mA - Ensures clean TTL/CMOS logic-low recognition across temperature |
| Supply Current | 4mA max - Low quiescent draw suitable for battery-backed or always-on sensing nodes |
Pinout & Package
AH372-P-A is supplied in SIP-3 (Ammo Pack) package with gull-wing leads, optimized for through-hole mounting and high-reliability motor assemblies. Pin 1 = VDD, Pin 2 = GND, Pin 3 = OUT - all pins are electrically and thermally validated per Diodes' AP02007 packaging standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Positive supply input | Accepts 2.2–20V DC; powers internal regulator, Hall plate, and output stage |
| 2 (GND) | Ground reference | Return path for supply and output sink current; must be low-impedance for noise immunity |
| 3 (OUT) | Open-drain digital output | Sinks up to 25mA; pulled low when B > BOP; floats high via internal 10kΩ resistor when inactive |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | Requires magnetic polarity reversal to toggle state - enables precise direction detection in rotary encoders |
| Integrated 10kΩ pullup | Reduces external component count and layout complexity while maintaining consistent rise time |
| Chopper-stabilized amplifier | Minimizes offset drift over temperature - ensures stable BOP/BRP thresholds from −40°C to +125°C |
| Wide 2.2V–20V supply range | Supports direct integration into 3.3V microcontroller I/O domains or 12V/24V motor power domains |
| AEC-Q100 capable process | Manufactured in IATF 16949 certified facilities - meets baseline reliability requirements for automotive subsystems |
Applications
| BLDC Motor Commutation | Rotary Encoder Feedback |
|---|---|
Use Scenario: Detecting rotor magnet position in 3-phase brushless DC motors for electronic commutation timing. IC Role / Device Role / Timing Role: Hall-effect latch providing synchronized digital edge transitions aligned to magnetic pole crossings. Use Value: Enables precise 120° electrical phase alignment with <60G hysteresis to reject vibration-induced false triggers. |
Use Scenario: Converting angular shaft rotation into quadrature or single-channel pulse trains for position tracking. IC Role / Device Role / Timing Role: Bipolar latch generating clean, debounced digital pulses per pole pair crossing. Use Value: Internal pullup and 25mA sink drive interface directly to MCU GPIO or dedicated encoder ICs without external biasing. |
| RPM Monitoring System | Contactless Current Switch |
Use Scenario: Measuring rotational speed of fans, pumps, or conveyor drives via magnetic target wheel sensing. IC Role / Device Role / Timing Role: Magnetic threshold detector converting mechanical rotation into frequency-proportional digital signal. Use Value: 2.2V start-up voltage and −40°C to +125°C operation ensure reliable counting across wide ambient conditions. |
Use Scenario: Isolating current flow detection using magnetic field generated around a conductor. IC Role / Device Role / Timing Role: Threshold-based switch activated by magnetic flux from load current, eliminating shunt resistor losses. Use Value: 20V max supply and 25mA sink capability allow direct interface to PLC input modules or solid-state relay drivers. |
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 with improved BOP/BRP matching (±25G), lower IDD (1.5mA typ.), and AEC-Q100 Grade 0 qualification | Recommended for new designs requiring tighter magnetic tolerance and extended temperature margin (−40°C to +150°C) | Select AH3724 for production ramps; AH372-P-A remains viable for legacy repair or cost-sensitive non-automotive use |
| US1881 | Lower supply range (3.0–24V), no internal pullup, 50mA sink, TO-92 package | Better suited for high-current switching but requires external pullup and lacks SIP-3 mounting compatibility | Choose US1881 only if higher sink drive or through-hole TO-92 form factor is mandatory |
Compared with AH3724 and US1881, AH372-P-A offers unique SIP-3 (Ammo Pack) packaging with integrated pullup and proven thermal performance at lower cost-ideal for volume motor control replacements where design change is constrained.
Availability
AH372-P-A is available at Aetrix Electronics and suitable for BLDC motor commutation, RPM monitoring, and contactless current switching requiring stable component supply across industrial and automotive aftermarket programs.
Supply support for AH372-P-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 components for automotive, industrial, and computing markets.
AH372 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust magnetic position sensing in motor control and motion feedback systems operating under harsh thermal and EMI conditions.
FAQ
What is the recommended bypass capacitor for AH372-P-A?
A 100nF ceramic capacitor between VDD and GND is specified in the datasheet to stabilize the internal regulator and improve noise immunity. Place it within 5mm of the VDD/GND pins using short, low-inductance traces to maintain switching integrity in high-EMI motor environments.
Does AH372-P-A require an external pullup resistor?
No. AH372-P-A includes an internal 10kΩ pullup resistor on the OUT pin, confirmed in Electrical Characteristics (RPU = 7–13kΩ). External pullups are unnecessary and may degrade rise time or cause contention if incorrectly sized.
Can AH372-P-A operate at 3.3V logic levels?
Yes. With a minimum operating voltage of 2.2V and output on-voltage ≤400mV at 20mA, AH372-P-A reliably interfaces with 3.3V CMOS/TTL inputs. The internal bandgap regulator ensures stable magnetic thresholds even at 3.3V supply.
Is AH372-P-A qualified for automotive applications?
AH372-P-A is manufactured in IATF 16949 certified facilities and supports automotive temperature range (−40°C to +125°C), but it is not formally AEC-Q100 qualified. For new automotive designs, Diodes recommends AH3724 - the AEC-Q100 Grade 0 successor.
AH372-P-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SSIP
- Packaging:
- Cut Tape (CT)
- 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:
- Analog Voltage
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH372-P-A FAQ
1.How can I place an order for AH372-P-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH372-P-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 AH372-P-A reliable?
The price and inventory of AH372-P-A 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-A is usually 5 days.
3.What payment methods are accepted for AH372-P-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH372-P-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH372-P-A?
AH372-P-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH372-P-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 AH372-P-A?
For technical support, including AH372-P-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH372-P-A requirements.
6.How does Aetrix verify that AH372-P-A is sourced from the original manufacturer or authorized distributors?
All AH372-P-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 AH372-P-A meets industry standards.
7.What is the process for return or replacement of AH372-P-A?
All AH372-P-A units undergo pre-shipment inspection (PSI). If there is an issue with AH372-P-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 AH372-P-A part is unused and in its original packaging.
Return procedure for AH372-P-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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