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Diodes Incorporated AH175-WL-7-A
- Part No.:
- AH175-WL-7-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH175-WL-7-A.pdf
- Description:
- MAGNETIC SWITCH LATCH SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,072
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Product details
Overview
AH175-WL-7-A from Diodes Incorporated is a bipolar Hall-effect latch sensor designed for high-temperature rotor position and RPM sensing in three-phase BLDC motor control systems. It operates from 3.5V to 20V, delivers 25mA sink current, features open-collector pre-driver output, and supports -40°C to +150°C ambient operation in SC59 (SOT-23) package.
For engineers reviewing the AH175-WL-7-A datasheet, AH175-WL-7-A pinout, AH175-WL-7-A application, or AH175-WL-7-A equivalent, key selection criteria include magnetic operate/release points (Bop/Brp), temperature-compensated band-gap regulation, built-in reverse-polarity protection, and AEC-Q100 suitability for automotive motor control.
Technical Context
The AH175 integrates a Hall voltage generator, amplifier, comparator with hysteresis, and open-collector pre-driver - all powered by an internal band-gap regulator enabling stable operation across 3.5–20V supply and -40°C to +150°C ambient. Its latching behavior requires magnetic polarity reversal to toggle state: output sinks current when B ≥ Bop (e.g., 15–60 Gauss A-grade), holds until B ≤ Brp (e.g., -60 to -15 Gauss).
Magnetic thresholds are specified for south-pole activation toward the branded side, with hysteresis (Bhy) ranging 30–120 Gauss (A-grade) or 10–160 Gauss (B-grade). Output saturation voltage is ≤400mV at 10mA sink, and supply current is ≤6mA in off-state at 12V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.5V to 20V DC - enables direct connection to 12V automotive rails without external regulation |
| Operating Temperature | -40°C to +150°C - qualified for under-hood motor control and industrial actuator environments |
| Output Type | Open-collector pre-driver - interfaces directly with external pull-up and logic-level MOSFET gate drivers |
| Sink Current | 25mA maximum - sufficient to drive small-signal loads or interface with standard logic inputs |
| Magnetic Hysteresis | 30–120 Gauss (A-grade) - prevents chatter near switching threshold in noisy EMI environments |
| Power Dissipation (SC59) | 230mW at 25°C, derates to 0mW at 150°C - defines thermal design margin for PCB layout |
| Reverse Polarity Protection | Built-in - eliminates need for external series diode in battery-connected applications |
Pinout & Package
The AH175-WL-7-A is supplied in SC59 package (commonly known as SOT-23 in Asia), with 3-pin surface-mount configuration and standardized pad layout per Diodes' outline drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc (Pin 1) | Positive power supply input | Accepts 3.5–20V; powers internal band-gap regulator and signal chain |
| GND (Pin 2) | Ground reference | Common return path for Hall sensor, amplifier, comparator, and output stage |
| OUT (Pin 3) | Digital output terminal | Open-collector NPN output - sinks current when active; requires external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latching operation | Requires magnetic polarity reversal to change state - ensures robust position detection in rotating fields |
| Wide supply range (3.5–20V) | Eliminates need for dedicated LDO in 5V/12V/24V systems - reduces BOM count and layout area |
| Integrated reverse-polarity protection | Withstands -20V reverse supply without damage - enhances field reliability in service environments |
| High-temperature qualification | Validated operation up to +150°C junction - supports placement near motors, inverters, and exhaust systems |
| Lead-free & halogen-free construction | Meets RoHS 3 (2015/863/EU) and Diodes' "Green" definition (<900ppm Br/Cl, <1000ppm Sb) - compliant for global automotive shipments |
Applications
| Rotor Position Sensing | Current Switch Monitoring |
|---|---|
Use Scenario: Detecting commutation timing in 3-phase brushless DC motors using embedded Hall sensors. IC Role / Device Role / Timing Role: Provides digital edge-aligned latched signals synchronized to rotor magnet polarity transitions. Use Value: Enables precise 120° electrical phase alignment with ±15 Gauss magnetic tolerance - critical for torque ripple minimization. | Use Scenario: Monitoring load current status in solid-state relays or smart fuses via magnetic field coupling. IC Role / Device Role / Timing Role: Acts as zero-crossing–immune current presence detector with hysteresis-based noise immunity. Use Value: Delivers reliable on/off indication without auxiliary power or shunt resistors - reduces system power loss and heat generation. |
| Encoder Index Detection | RPM Measurement in Harsh Environments |
Use Scenario: Identifying index pulse in incremental optical or magnetic encoders for homing and absolute position initialization. IC Role / Device Role / Timing Role: Generates clean, debounced index flag signal triggered by single magnet passage. Use Value: Provides deterministic index edge with 80 Gauss typical hysteresis - prevents false triggers during vibration or EMI exposure. | Use Scenario: Measuring rotational speed of turbochargers, HVAC blowers, or industrial pumps operating above 125°C ambient. IC Role / Device Role / Timing Role: Serves as ruggedized magnetic tachometer front-end with extended temperature capability. Use Value: Maintains functional accuracy up to +150°C ambient - avoids thermal shutdown or parameter drift seen in commercial-grade sensors. |
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 | Higher sensitivity (Bop: 5–35G), lower VCC min (2.5V), integrated ESD protection (±8kV HBM) | Optimized for low-voltage battery-powered devices and higher-precision position detection | Select when upgrading from AH175 in new designs requiring improved noise immunity and wider voltage headroom |
| HAL1506 | Programmable hysteresis (10–100G), 3.3V/5V fixed supply, push-pull output | Targets microcontroller-native I/O without external pull-up; suited for compact consumer motion sensing | Prefer when system lacks pull-up resources or requires configurable magnetic thresholds via I²C |
Compared with AH175-WL-7-A, AH3724 offers enhanced ESD robustness and lower-voltage operation ideal for next-gen automotive ECUs, while HAL1506 provides programmability and push-pull convenience at the cost of reduced temperature range (–40°C to +125°C) and no reverse-polarity protection.
Availability
AH175-WL-7-A is available at Aetrix Electronics and suitable for three-phase BLDC motor control, high-temperature RPM monitoring, and industrial encoder index detection requiring stable component supply across extended lifecycle programs.
Supply support for AH175-WL-7-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.
The AH175 belongs to Diodes' Hall-effect sensor product line, engineered specifically for demanding motor commutation and position feedback applications where extended temperature range and magnetic noise immunity are critical.
FAQ
What is the magnetic polarity requirement for AH175-WL-7-A activation?
The AH175-WL-7-A activates when a south pole approaches the branded side of the package, with Bop ranging from 15–60 Gauss (A-grade). It releases only upon magnetic reversal below Brp (–60 to –15 Gauss), ensuring true latching behavior independent of field strength decay.
Can AH175-WL-7-A be used without an external pull-up resistor?
No - the device has an open-collector output stage and requires an external pull-up resistor to Vcc or another logic rail. Typical values range from 2.2kΩ to 10kΩ depending on rise-time and bus capacitance requirements.
Is AH175-WL-7-A qualified to AEC-Q100?
While not explicitly listed as AEC-Q100 qualified in its datasheet, the AH175 is manufactured in IATF 16949-certified facilities and supports automotive change control. Diodes states that parts meeting AEC-Q100/101/104/200 require direct consultation - this part is NRND but remains viable for legacy automotive programs.
How does the internal band-gap regulator affect supply rejection?
The internal band-gap regulator provides temperature-compensated biasing for the Hall element and signal chain, resulting in stable switching thresholds across 3.5–20V supply and full temperature range. Supply voltage variation has minimal impact on Bop/Brp - typical shift is <±5% over VCC range at constant temperature.
AH175-WL-7-A 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:
- 3.5V ~ 20V
- Current - Supply (Max):
- 6mA
- Current - Output (Max):
- 25mA
- Output Type:
- Open Collector
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH175-WL-7-A FAQ
1.How can I place an order for AH175-WL-7-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH175-WL-7-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 AH175-WL-7-A reliable?
The price and inventory of AH175-WL-7-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH175-WL-7-A is usually 5 days.
3.What payment methods are accepted for AH175-WL-7-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH175-WL-7-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH175-WL-7-A?
AH175-WL-7-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH175-WL-7-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 AH175-WL-7-A?
For technical support, including AH175-WL-7-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH175-WL-7-A requirements.
6.How does Aetrix verify that AH175-WL-7-A is sourced from the original manufacturer or authorized distributors?
All AH175-WL-7-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 AH175-WL-7-A meets industry standards.
7.What is the process for return or replacement of AH175-WL-7-A?
All AH175-WL-7-A units undergo pre-shipment inspection (PSI). If there is an issue with AH175-WL-7-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 AH175-WL-7-A part is unused and in its original packaging.
Return procedure for AH175-WL-7-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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