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Diodes Incorporated AH375-PL-A
- Part No.:
- AH375-PL-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- -
- Datasheet:
-
AH375-PL-A.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:5,389
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Product details
Overview
AH375 from Diodes Incorporated is a bipolar Hall-effect latched sensor IC designed for electronic commutation in brushless DC motors and fans. It integrates a Hall voltage generator, comparator, Schmitt trigger with hysteresis, and open-drain output stage, operating from 2.2V to 20V with ±60 Gauss hysteresis and −40°C to +125°C ambient range.
For engineers reviewing the AH375 datasheet, AH375 pinout, AH375 application, or AH375 equivalent, this page delivers verified functional identity, validated SIP-3/SC59 package mapping, confirmed magnetic switching thresholds (Bop = 5–60 G, Brp = −60 to −5 G), and real-world motor commutation use context - not generic sensing claims.
Technical Context
The AH375 implements a monolithic Hall latch architecture with on-chip band-gap regulator for supply-independent magnetic performance across 2.2V–20V. Its Schmitt-triggered output provides 60 Gauss hysteresis to reject EMI and mechanical vibration noise in rotating systems.
It operates as a pre-driver with 25 mA sink capability and 300–700 mV saturation voltage at 20 mA, enabling direct interface to external MOSFETs or gate drivers in BLDC half-bridge control stages without additional level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2 V to 20 V - supports wide-input industrial and automotive power rails without external regulators |
| Output Type | Open-drain - enables wired-OR logic, pull-up flexibility, and compatibility with 3.3 V/5 V/12 V logic domains |
| Max Output Sink Current | 25 mA - sufficient to drive small-signal MOSFET gates or optocoupler LEDs directly |
| Magnetic Hysteresis | 60 Gauss - prevents chatter during slow or noisy magnetic transitions in motor position sensing |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial fan environments |
| Output Saturation Voltage | 300–700 mV at 20 mA - ensures low power loss and reliable logic-low assertion under load |
| Power Dissipation (SC59) | 230 mW at 25°C - defines thermal derating curve up to 150°C ambient with θJC = 543°C/W |
Pinout & Package
The AH375 is offered in SIP-3 (straight or spread lead) and SC59 (SOT-23 equivalent) packages. SIP-3 uses 3-pin single-in-line configuration; SC59 uses standard SOT-23 footprint with same pinout orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vdd (Pin 1) | Positive supply input | Accepts 2.2–20 V DC; powers internal regulator, Hall plate, and output stage |
| GND (Pin 2) | Ground reference | Common return path for Hall sensing, comparator, and output driver circuits |
| OUT (Pin 3) | Open-drain output | Sinks up to 25 mA when active; requires external pull-up for logic-high state |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latching operation | Switches ON at Bop ≥ +5 G (South pole), holds until Brp ≤ −5 G - eliminates need for external polarity detection |
| Temperature-compensated Hall element | Stable Bop/Brp over −40°C to +125°C - avoids calibration drift in motor control feedback loops |
| Wide supply range (2.2–20 V) | Eliminates dedicated LDO for sensor bias in multi-rail systems - reduces BOM count and layout area |
| RoHS-compliant & halogen-free | Meets EU RoHS 3 (2015/863/EU), <900 ppm Br/Cl, <1000 ppm Sb - compliant for automotive and green electronics programs |
Applications
| BLDC Motor Commutation | Brushless Fan Control |
|---|---|
Use Scenario: Rotor position sensing in 3-phase BLDC motors for trapezoidal commutation. IC Role / Device Role / Timing Role: Hall latch providing synchronized edge-triggered phase enable signals to gate driver ICs. Use Value: 60 Gauss hysteresis prevents false triggering during high-speed rotation and EMI-rich motor drive environments. |
Use Scenario: Speed regulation and stall detection in 12 V/24 V brushless cooling fans. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector feeding tachometer counter or PWM controller. Use Value: −40°C to +125°C operation ensures reliability in server chassis and automotive HVAC ducts. |
| Revolution Counting | Speed Measurement |
Use Scenario: Bidirectional shaft rotation counting in industrial encoders or flow meters. IC Role / Device Role / Timing Role: Edge-sensitive latch capturing magnet transitions per revolution. Use Value: Bipolar latching retains state between pulses - enables low-power wake-on-rotation designs. |
Use Scenario: Real-time RPM calculation in pump controllers and conveyor drives. IC Role / Device Role / Timing Role: Pulse generator synchronized to magnetic pole passage frequency. Use Value: Open-drain output interfaces directly to microcontroller input capture peripherals with configurable pull-ups. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Allegro A3295LUA-T | Higher Bop (15–80 G), wider hysteresis (70 G), integrated reverse-polarity protection | Preferred for harsher automotive environments requiring >2 kV ESD and reverse-battery immunity | Select if system-level reverse-voltage tolerance or higher magnetic sensitivity is required |
| Melexis US1881EUA-ABA-001-SP | Lower supply range (3.5–24 V), tighter Bop/Brp matching (±2 G typical), I²C diagnostic interface | Suitable for smart fan modules needing fault reporting and programmable thresholds | Choose when digital configurability and diagnostics outweigh cost and simplicity of AH375 |
Compared with A3295LUA-T and US1881EUA-ABA-001-SP, the AH375 offers lowest BOM cost and minimal external components for basic BLDC commutation, but lacks reverse-voltage protection and digital features - ideal for cost-sensitive, high-volume motor control where analog robustness suffices.
Availability
AH375 is available at Aetrix Electronics and suitable for brushless DC motor commutation, brushless fan control, revolution counting, and speed measurement applications requiring stable component supply despite its obsolete status - inventory is managed under last-time-buy protocols with full traceability.
Supply support for AH375 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The AH375 belongs to Diodes' Hall-effect sensor product line, engineered specifically for cost-effective, high-reliability rotor position sensing in BLDC motors and fans - emphasizing wide voltage operation, thermal stability, and ease of PCB integration.
FAQ
Is the AH375 still in production?
No - Diodes Incorporated has officially discontinued the AH375 (marked "OBSOLETE – PART DISCONTINUED" in DS31172 Rev. 8). Aetrix Electronics maintains limited legacy stock under controlled distribution with full lot traceability and documentation, intended for ongoing production support of existing designs only.
What is the recommended replacement part for new designs?
Diodes recommends the AH3774 as the direct functional successor. It shares identical pinout, magnetic thresholds (Bop/Brp), and electrical specs, but adds improved ESD robustness (±4 kV HBM) and tighter parametric tolerances. The AH3774 is fully compatible in both SIP-3 and SC59 packages.
Can the AH375 operate reliably at 2.2 V supply?
Yes - the device powers up and outputs valid logic states at 2.2 V, but magnetic switching characteristics (Bop/Brp) are only guaranteed within specification above 2.5 V. For designs operating near 2.2 V, magnetic sensitivity may vary by ±15% and should be validated under actual thermal and field conditions.
Does the AH375 require an external pull-up resistor on the OUT pin?
Yes - the open-drain output requires an external pull-up resistor to define the logic-high voltage level. Typical values range from 4.7 kΩ (for fast switching) to 100 kΩ (for ultra-low quiescent current); selection depends on rise time requirements and bus capacitance in the target application.
AH375-PL-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Function:
- -
- Technology:
- -
- Polarization:
- -
- Sensing Range:
- -
- Test Condition:
- -
- Voltage - Supply:
- -
- Current - Supply (Max):
- -
- Current - Output (Max):
- -
- Output Type:
- -
- Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
AH375-PL-A FAQ
1.How can I place an order for AH375-PL-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH375-PL-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 AH375-PL-A reliable?
The price and inventory of AH375-PL-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH375-PL-A is usually 5 days.
3.What payment methods are accepted for AH375-PL-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH375-PL-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH375-PL-A?
AH375-PL-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH375-PL-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 AH375-PL-A?
For technical support, including AH375-PL-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH375-PL-A requirements.
6.How does Aetrix verify that AH375-PL-A is sourced from the original manufacturer or authorized distributors?
All AH375-PL-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 AH375-PL-A meets industry standards.
7.What is the process for return or replacement of AH375-PL-A?
All AH375-PL-A units undergo pre-shipment inspection (PSI). If there is an issue with AH375-PL-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 AH375-PL-A part is unused and in its original packaging.
Return procedure for AH375-PL-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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