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Diodes Incorporated AH173-WL-7-B
- Part No.:
- AH173-WL-7-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH173-WL-7-B.pdf
- Description:
- MAGNETIC SWITCH LATCH SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,056
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Product details
Overview
AH173-WL-7-B from Diodes Incorporated is a bipolar Hall effect latch sensor with integrated pullup resistor, designed for high-temperature rotor position sensing and RPM detection in three-phase BLDC motor control. It operates from 3V to 20V, delivers 25mA sink current, features ±15–60 Gauss magnetic operate/release points (A-grade), and is rated for –40°C to +125°C ambient operation in SC59 (SOT23) package.
For engineers reviewing the AH173-WL-7-B datasheet, AH173-WL-7-B pinout, AH173-WL-7-B application, or AH173-WL-7-B equivalent, this page provides verified magnetic thresholds, thermal derating curves, internal Rpu value (7–13 kΩ), VOUT saturation voltage (≤400 mV @ 10mA), and confirmed AEC-Q100-relevant qualification status per Diodes' automotive product definitions.
Technical Context
The AH173 implements a bipolar latching architecture: output switches low when south-pole flux exceeds Bop (e.g., 15–60 G), remains latched until reversed field falls below Brp (e.g., –60 to –15 G), delivering 80 G typical hysteresis. Its on-chip bandgap regulator enables stable internal bias across the full 3–20 V supply range.
Thermal performance is package-dependent: SC59 (SOT23) supports 230 mW at 25°C, derating linearly to 0 mW at 150°C; SIP-3 variants support 550 mW at 25°C. The integrated 7–13 kΩ pullup eliminates external components in open-drain interface designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3 V to 20 V DC - supports direct connection to 12 V automotive rails without external regulation |
| Output Sink Current | 25 mA - drives standard logic inputs or small-signal MOSFET gates directly |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial motor control environments |
| Magnetic Hysteresis | 80 Gauss typ - prevents chatter in noisy magnetic fields near switching thresholds |
| Internal Pullup Resistor | 7–13 kΩ - eliminates need for external pullup in microcontroller GPIO interfaces |
| Output Saturation Voltage | ≤400 mV @ 10 mA - ensures clean TTL/CMOS logic-low recognition across temperature |
| Supply Current (Off) | 3.5–6 mA @ 12 V - enables low-quiescent-power motor commutation monitoring |
Pinout & Package
Package: SC59 (commonly known as SOT23 in Asia), 3-pin surface-mount, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Positive power supply input | Accepts 3–20 V DC; powers internal regulator, amplifier, comparator, and output stage |
| GND | Ground reference | Return path for supply current and output sink current; must be low-impedance |
| OUT | Open-collector digital output | Sinks up to 25 mA when active; pulled high internally via 7–13 kΩ resistor when inactive |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latching operation | Eliminates need for external polarity reversal circuitry in bidirectional rotation sensing |
| Integrated 7–13 kΩ pullup | Reduces BOM count and PCB area in microcontroller-based Hall interface designs |
| Wide 3–20 V supply range | Supports direct integration into 5 V, 12 V, and 24 V systems without level-shifting |
| –40°C to +125°C operation | Validated for engine compartment and industrial drive environments without derating |
| 80 Gauss magnetic hysteresis | Ensures robust switching in vibration-prone motor applications with stray field noise |
Applications
| Three-Phase BLDC Motor Commutation | Rotor Position Sensing |
|---|---|
Use Scenario: Detecting rotor pole alignment in automotive HVAC blowers and EPS motors. IC Role / Device Role / Timing Role: Digital Hall latch providing synchronized edge-triggered signals to motor driver IC for precise 120° commutation sequencing. Use Value: Enables accurate phase timing with <80 G hysteresis, reducing torque ripple and acoustic noise in closed-loop speed control. |
Use Scenario: Monitoring angular position of rotating shafts in industrial pumps and fans. IC Role / Device Role / Timing Role: Bipolar latch generating deterministic high/low states per magnet pole transition for absolute position tracking. Use Value: Delivers repeatable switching at ±15–60 G thresholds across –40°C to +125°C, eliminating calibration drift in long-life equipment. |
| Current Switch Interface | RPM Detection |
Use Scenario: Solid-state replacement for mechanical current-sensing relays in battery management systems. IC Role / Device Role / Timing Role: Hall latch triggering gate drivers based on magnetic field generated by load current through a conductor loop. Use Value: Provides galvanically isolated, wear-free switching with 25 mA sink capability-sufficient to drive optocoupler LEDs or small MOSFETs directly. |
Use Scenario: Measuring rotational speed of gear teeth or encoder wheels in factory automation. IC Role / Device Role / Timing Role: Edge-detecting latch converting magnetic transitions into clean square-wave tachometer signals. Use Value: Internal 80 G hysteresis rejects EMI-induced false triggers during high-speed counting, supporting reliable RPM measurement up to 20 kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3722A | Higher sensitivity (Bop: 5–35 G), lower VCC min (2.5 V), SC59 package, AEC-Q100 Grade 0 qualified | Designed for low-field, low-voltage automotive sensors requiring PPAP documentation | Select for new automotive designs requiring formal qualification and tighter magnetic tolerance |
| AH3724A | Same package and qualification as AH3722A but with extended Bop range (5–80 G) and higher hysteresis (100 G typ) | Optimized for variable-air-gap or high-vibration environments where field strength varies significantly | Select when operating with weak magnets or in mechanically unstable mounting conditions |
Compared with AH173-WL-7-B, AH3722A and AH3724A offer AEC-Q100 qualification, lower minimum supply voltage, and tighter magnetic parameter distributions-making them suitable for production automotive programs, whereas AH173 remains viable for cost-sensitive industrial retrofits where NRND status is acceptable.
Availability
AH173-WL-7-B is available at Aetrix Electronics and suitable for three-phase BLDC motor commutation, industrial RPM detection, and rotor position sensing requiring stable component supply in legacy industrial and automotive service applications.
Supply support for AH173-WL-7-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
AH173 belongs to Diodes' Hall-effect sensor product line, engineered specifically for contactless position and speed sensing in harsh-temperature motor control and industrial automation systems.
FAQ
Is AH173-WL-7-B qualified for automotive use?
No-AH173-WL-7-B is not AEC-Q100 qualified. Diodes explicitly states it is "Not Recommended for New Design" (NRND) and recommends AH3722A/AH3724A for automotive applications requiring PPAP, change control, and IATF 16949 manufacturing. AH173 may be used in non-safety-critical aftermarket or industrial service replacements where qualification is not mandated.
What is the exact value of the internal pullup resistor?
The internal pullup resistor (Rpu) is specified as 7–13 kΩ (typical 10 kΩ) across process and temperature. This value is measured between Vcc and OUT pins when the output transistor is off, enabling direct interfacing with microcontroller GPIOs without external components.
Can AH173-WL-7-B operate at 24 V supply?
No-absolute maximum supply voltage is 20 V. Operation at 24 V exceeds the Absolute Maximum Rating and risks permanent damage. For 24 V systems, a series resistor or external regulator must limit Vcc to ≤20 V, or AH3722A/AH3724A (rated to 28 V) should be selected instead.
How does magnetic polarity affect AH173-WL-7-B switching?
AH173-WL-7-B is a bipolar latch: it turns ON (OUT = low) when a south pole approaches the branded side with flux > Bop, and remains latched until a north pole reduces flux below Brp. Reversal direction matters-only south-to-north field transitions cause release; north-to-south will not trigger turn-on.
AH173-WL-7-B 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:
- 3V ~ 20V
- Current - Supply (Max):
- 6mA
- Current - Output (Max):
- 25mA
- Output Type:
- Open Collector
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH173-WL-7-B FAQ
1.How can I place an order for AH173-WL-7-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH173-WL-7-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 AH173-WL-7-B reliable?
The price and inventory of AH173-WL-7-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH173-WL-7-B is usually 5 days.
3.What payment methods are accepted for AH173-WL-7-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH173-WL-7-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH173-WL-7-B?
AH173-WL-7-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH173-WL-7-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 AH173-WL-7-B?
For technical support, including AH173-WL-7-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH173-WL-7-B requirements.
6.How does Aetrix verify that AH173-WL-7-B is sourced from the original manufacturer or authorized distributors?
All AH173-WL-7-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 AH173-WL-7-B meets industry standards.
7.What is the process for return or replacement of AH173-WL-7-B?
All AH173-WL-7-B units undergo pre-shipment inspection (PSI). If there is an issue with AH173-WL-7-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 AH173-WL-7-B part is unused and in its original packaging.
Return procedure for AH173-WL-7-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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