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Diodes Incorporated AH375-WG-7
- Part No.:
- AH375-WG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH375-WG-7.pdf
- Description:
- MAGNETIC SWITCH LATCH SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,501
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Product details
Overview
AH375-WG-7 from Diodes Incorporated is a bipolar Hall-effect latched sensor IC designed for electronic commutation in brushless DC motors and speed-sensing applications. It operates from 2.2V to 20V, delivers 25mA sink current, features ±30G typical operate/release points with 60G hysteresis, and uses an open-drain output in SC59 (SOT23) package for compact motor control PCBs.
For engineers reviewing the AH375-WG-7 datasheet, AH375-WG-7 pinout, AH375-WG-7 application, or AH375-WG-7 equivalent, key selection criteria include magnetic threshold stability over temperature, wide supply range compatibility with 12V/24V motor systems, SC59 footprint constraints, and latch behavior for reliable rotor position detection in BLDC fans and pumps.
Technical Context
The AH375-WG-7 integrates a Hall plate, amplifier, Schmitt trigger with built-in hysteresis, and band-gap regulator-enabling stable operation across -40°C to +125°C ambient. Its latch function holds output state until magnetic polarity reversal crosses the release point (Brp), eliminating need for external feedback.
It requires no external components for basic operation: Vdd powers internal regulation, GND completes bias, and OUT drives external pull-up loads up to 25mA. Magnetic sensing occurs on the branded side of the SC59 package, with sensitivity calibrated for south-pole activation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2V–20V DC: Supports direct connection to 12V/24V motor rails without external LDO. |
| Output Type | Open-drain: Enables wired-OR configuration and flexible pull-up voltage selection (e.g., 3.3V logic interface). |
| Max Sink Current | 25mA: Drives standard logic-level MOSFET gates or small relays without buffer stage. |
| Magnetic Hysteresis | 60G typical: Prevents chatter during slow or noisy magnetic transitions near Bop/Brp thresholds. |
| Operating Temp | -40°C to +125°C: Qualified for under-hood automotive fan control and industrial motor enclosures. |
| Package | SC59 (SOT23): 3-pin surface-mount footprint compatible with high-volume automated assembly. |
| Output Saturation | 700mV max @ 20mA: Ensures low-loss switching and predictable logic-low level for downstream receivers. |
Pinout & Package
SC59 package (3-pin SOT23 variant), top-view marking "P3", branded side faces magnetic source. Pin 1 = Vdd, Pin 2 = GND, Pin 3 = OUT - all on same edge, gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Vdd) | Positive power input | Supplies internal regulator; must be ≥2.5V for full magnetic specification compliance. |
| 2 (GND) | Ground reference | Common return for Hall plate, amplifier, and output FET; requires low-impedance PCB plane. |
| 3 (OUT) | Open-drain output | Sinks current when active; requires external pull-up to define logic-high voltage and load timing. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | Holds output state until magnetic polarity reversal crosses Brp, enabling robust rotor position memory in BLDC phase sequencing. |
| Wide supply range | 2.2V–20V operation eliminates need for dedicated bias rail in 12V/24V motor control boards. |
| Temperature-compensated Hall element | Stable Bop/Brp thresholds across -40°C to +125°C, reducing calibration overhead in thermal-cycling environments. |
| Integrated Schmitt trigger | 60G hysteresis suppresses false triggering from EMI or mechanical vibration in fan/motor assemblies. |
| Lead-free & green construction | Meets RoHS 3, halogen-free (<900ppm Br/Cl, <1000ppm Sb), suitable for automotive and industrial eco-compliance programs. |
Applications
| BLDC Motor Commutation | Brushless Fan Control |
|---|---|
Use Scenario: Detecting rotor magnet position to time stator coil energization in 3-phase BLDC motors. IC Role / Device Role / Timing Role: Latched Hall sensor providing synchronized digital edge transitions per pole pair rotation. Use Value: Enables precise 6-step commutation without encoder feedback, reducing system cost and board space. |
Use Scenario: Monitoring rotational speed and direction in server cooling fans and HVAC blowers. IC Role / Device Role / Timing Role: Pulse generator delivering RPM-proportional square wave to microcontroller timer input. Use Value: Provides accurate tachometer signal with inherent noise immunity due to magnetic hysteresis. |
| Revolution Counting | Speed Measurement Systems |
Use Scenario: Counting gear tooth or magnet passes in industrial conveyors and metering pumps. IC Role / Device Role / Timing Role: Edge-triggered event counter input with latch persistence between pulses. Use Value: Eliminates missed counts at low speeds by holding state until next valid magnetic transition. |
Use Scenario: Measuring angular velocity in automotive radiator fans and power steering assist modules. IC Role / Device Role / Timing Role: Digital speed transducer interfacing directly to MCU GPIO with minimal external components. Use Value: Delivers repeatable timing edges across temperature and supply variation, supporting ASIL-B functional safety monitoring. |
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 A3291LUA-T | Higher Bop (45–85G), wider hysteresis (80G), 3.3V–24V supply, SOIC-8 package | Requires larger PCB area; better suited for high-noise industrial environments | Select when higher magnetic immunity or SOIC thermal mass is needed over SC59 size constraint |
| Melexis US1881EUA-ABA-000-SP | Lower supply range (3.5–24V), tighter Bop tolerance (±5G), same SC59 package | Not qualified for <2.5V start-up; optimized for precision speed sensing vs. motor commutation | Prefer when absolute threshold accuracy matters more than ultra-low-voltage operation |
Compared with A3291LUA-T and US1881EUA-ABA-000-SP, AH375-WG-7 uniquely supports 2.2V start-up and maintains latch stability down to -40°C in SC59, making it optimal for cost-sensitive, space-constrained BLDC fan designs where early-turn-on capability is critical.
Availability
AH375-WG-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, fan speed monitoring, revolution counting, and industrial speed measurement requiring stable component supply and long-term sourcing continuity.
Supply support for AH375-WG-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, headquartered in Plano, Texas, with design and manufacturing facilities across Asia and the Americas.
AH375-WG-7 belongs to Diodes' Hall-effect sensor product line, engineered specifically for reliable, low-cost rotor position sensing in automotive and industrial brushless motor systems.
FAQ
What is the minimum supply voltage required for magnetic sensing functionality?
The AH375-WG-7 begins operating electrically at 2.2V, but its magnetic characteristics-including Bop and Brp-are only guaranteed within specification when Vdd exceeds 2.5V. Below 2.5V, output switching may occur but with degraded threshold accuracy and repeatability.
Can AH375-WG-7 drive a MOSFET gate directly?
Yes-the 25mA maximum sink current and 700mV typical saturation voltage at 20mA allow direct driving of logic-level N-channel MOSFET gates (e.g., Si2302, DMN2004) with appropriate pull-up resistor selection to ensure fast turn-off and avoid shoot-through in half-bridge configurations.
Is AH375-WG-7 pin-compatible with other SC59 Hall sensors?
No-while AH375-WG-7 uses the SC59 package, its pinout (Vdd-GND-OUT) differs from common alternatives like US1881 (Vdd-OUT-GND) and A3212 (Vdd-OUT-GND). PCB layout must match AH375's specific 1-2-3 assignment to avoid functional failure.
Why does the datasheet mark AH375 as obsolete?
Diodes has discontinued AH375 in favor of AH3774, which offers improved temperature drift and tighter magnetic tolerances. However, AH375-WG-7 remains available through authorized distributors for legacy design support and existing production runs with verified qualification records.
AH375-WG-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):
- 2mA
- 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
AH375-WG-7 FAQ
1.How can I place an order for AH375-WG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH375-WG-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 AH375-WG-7 reliable?
The price and inventory of AH375-WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH375-WG-7 is usually 5 days.
3.What payment methods are accepted for AH375-WG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH375-WG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH375-WG-7?
AH375-WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH375-WG-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 AH375-WG-7?
For technical support, including AH375-WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH375-WG-7 requirements.
6.How does Aetrix verify that AH375-WG-7 is sourced from the original manufacturer or authorized distributors?
All AH375-WG-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 AH375-WG-7 meets industry standards.
7.What is the process for return or replacement of AH375-WG-7?
All AH375-WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH375-WG-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 AH375-WG-7 part is unused and in its original packaging.
Return procedure for AH375-WG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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