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Diodes Incorporated AH173-WL-7-A
- Part No.:
- AH173-WL-7-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH173-WL-7-A.pdf
- Description:
- MAGNETIC SWITCH LATCH SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,544
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Product details
Overview
AH173-WL-7-A from Diodes Incorporated is a bipolar Hall effect latch sensor with integrated 10 kΩ pullup resistor, designed for high-temperature rotor position sensing and RPM detection in three-phase BLDC motors. It operates from 3V to 20V, delivers 25 mA sink current, switches at ±15–60 Gauss (A-grade), and functions reliably from −40°C to +125°C in SC59 (SOT23) package.
For engineers reviewing the AH173-WL-7-A datasheet, AH173-WL-7-A pinout, AH173-WL-7-A application, or AH173-WL-7-A equivalent, this page provides verified magnetic thresholds, thermal derating curves, output saturation voltage under load, internal regulator behavior, and direct replacement guidance for legacy motor control designs.
Technical Context
The AH173-WL-7-A implements a bipolar latching architecture: output turns ON (low) when south-pole flux exceeds Bop (15–60 G), remains latched until reverse flux falls below Brp (−60 to −15 G), delivering 80 G hysteresis for robust noise immunity. Its bandgap-regulated core ensures stable switching across supply (3–20 V) and temperature (−40°C to +125°C).
Internal circuitry includes Hall plate, chopper-stabilized amplifier, comparator with hysteresis, open-collector NPN output stage with on-chip 7–13 kΩ pullup, and thermal shutdown protection. The SC59 package supports surface-mount assembly with 230 mW power dissipation at 25°C, derating linearly to 0 mW at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3 V to 20 V DC - supports wide-input industrial and automotive battery rails without external regulation. |
| Output Sink Current | 25 mA - directly drives logic inputs or small relays without external buffer stages. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood and motor-adjacent placement in BLDC systems. |
| Magnetic Hysteresis | 80 Gauss - prevents chatter during slow or noisy field transitions in rotating machinery. |
| Output Saturation Voltage | ≤400 mV @ 10 mA - ensures clean TTL/CMOS-compatible low-state margin even at max load. |
| Internal Pullup Resistor | 7–13 kΩ - eliminates need for external pullup, reducing BOM count and PCB area. |
| Power Dissipation (SC59) | 230 mW @ 25°C - defines maximum continuous power before thermal shutdown in SOT23 footprint. |
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, Hall plate, 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; requires external pullup only if internal Rpu is insufficient. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latching operation | Eliminates need for external polarity reversal circuitry in bidirectional rotation sensing. |
| Integrated 10 kΩ pullup resistor | Reduces component count by one per sensor; simplifies layout and improves signal integrity. |
| Chopper-stabilized amplifier | Minimizes offset drift over temperature, enabling stable Bop/Brp thresholds across −40°C to +125°C. |
| Bandgap-regulated supply | Decouples internal circuit performance from supply rail fluctuations, ensuring consistent timing. |
| AEC-Q100-capable process | Manufactured in IATF 16949-certified facilities; supports PPAP documentation for automotive programs. |
Applications
| Three-Phase BLDC Motor Commutation | Rotor Position Sensing |
|---|---|
|
Use Scenario: Detecting rotor magnet polarity in real time to sequence gate drive signals for U/V/W phases. IC Role / Device Role / Timing Role: Digital position feedback element providing edge-triggered commutation timing with 80 G hysteresis. Use Value: Enables precise 120° electrical phase alignment without analog interpolation or calibration. |
Use Scenario: Monitoring angular position of rotating shafts in HVAC blowers or power tools. IC Role / Device Role / Timing Role: Bipolar latch capturing north/south transitions to determine absolute half-cycle position. Use Value: Delivers deterministic state retention between pulses, eliminating missed counts in low-RPM operation. |
| Current Switch Control | RPM Detection |
|
Use Scenario: Enabling/disabling high-side power switches based on mechanical actuation (e.g., door latch, valve position). IC Role / Device Role / Timing Role: Solid-state replacement for microswitches; provides bounce-free digital on/off signaling. Use Value: Supports >1 million cycles without contact wear, with 25 mA sink capability driving logic-level MOSFET gates directly. |
Use Scenario: Measuring rotational speed via pulse frequency counting in fan tachometer or pump monitoring. IC Role / Device Role / Timing Role: Edge-generating sensor converting magnetic pole crossings into fixed-width logic pulses. Use Value: Output saturation voltage ≤400 mV ensures reliable low-state recognition at 3.3 V or 5 V MCU inputs. |
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 | Lower Bop (3–30 G), higher sensitivity, 3.3 V min supply, SC59 package | Better suited for low-field or battery-powered applications; not rated for >105°C ambient | Select when operating flux is weak (<20 G) and temperature stays ≤105°C. |
| AH3724A | Wider Bop range (5–80 G), same SC59 package, improved ESD rating (±4 kV HBM) | Supports both low- and high-field environments; enhanced robustness in noisy industrial settings | Preferred for new designs requiring AEC-Q100 qualification and extended magnetic range. |
Compared with AH173-WL-7-A, AH3722A offers finer low-field resolution but reduced thermal margin, while AH3724A extends operational flexibility with broader Bop coverage and stronger ESD immunity-making it the recommended drop-in upgrade path.
Availability
AH173-WL-7-A is available at Aetrix Electronics and suitable for three-phase BLDC motor commutation, rotor position sensing, and RPM detection requiring stable component supply in industrial and automotive contexts.
Supply support for AH173-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 ICs, specializing in high-reliability power management, signal integrity, and sensing solutions for industrial, automotive, and computing markets.
The AH173 belongs to Diodes' Hall-effect sensor product line, engineered specifically for contactless position and speed sensing in harsh-temperature motor control systems where latch stability and supply resilience are critical.
FAQ
Is AH173-WL-7-A pin-compatible with AH3722A or AH3724A?
Yes-AH173-WL-7-A, AH3722A, and AH3724A share identical SC59 (SOT23) pinout: Pin 1 = Vcc, Pin 2 = GND, Pin 3 = OUT. No PCB redesign is needed for migration, though firmware may require recalibration due to differing Bop/Brp thresholds.
What is the actual value of the internal pullup resistor?
The datasheet specifies Rpu as 7–13 kΩ, with typical value 10 kΩ. This is confirmed across production lots and validated in electrical characterization at TA = +25°C and VCC = 12 V; no external pullup is required for standard 3.3 V or 5 V logic interfacing.
Does AH173-WL-7-A support AEC-Q100 qualification?
The AH173 is manufactured in IATF 16949-certified facilities and supports PPAP documentation, but it is not formally AEC-Q100-qualified. For new automotive designs, Diodes recommends AH3724A, which carries full AEC-Q100 Grade 1 (−40°C to +125°C) certification.
Why is AH173 marked "Not Recommended for New Design"?
Diodes designates AH173 as NRND because AH3724A offers superior magnetic range, enhanced ESD robustness (±4 kV HBM), and formal AEC-Q100 qualification-while maintaining SC59 compatibility and backward pinout. Legacy designs may continue using AH173-WL-7-A under existing BOMs.
AH173-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:
- 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-A FAQ
1.How can I place an order for AH173-WL-7-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH173-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 AH173-WL-7-A reliable?
The price and inventory of AH173-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 AH173-WL-7-A is usually 5 days.
3.What payment methods are accepted for AH173-WL-7-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH173-WL-7-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH173-WL-7-A?
AH173-WL-7-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH173-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 AH173-WL-7-A?
For technical support, including AH173-WL-7-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH173-WL-7-A requirements.
6.How does Aetrix verify that AH173-WL-7-A is sourced from the original manufacturer or authorized distributors?
All AH173-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 AH173-WL-7-A meets industry standards.
7.What is the process for return or replacement of AH173-WL-7-A?
All AH173-WL-7-A units undergo pre-shipment inspection (PSI). If there is an issue with AH173-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 AH173-WL-7-A part is unused and in its original packaging.
Return procedure for AH173-WL-7-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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