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Diodes Incorporated AH173-WG-7-A
- Part No.:
- AH173-WG-7-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH173-WG-7-A.pdf
- Description:
- MAGNETIC SWITCH LATCH SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
AH173-WG-7-A 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 functions across –40°C to +125°C in SC59 (SOT23) package.
For engineers reviewing the AH173-WG-7-A datasheet, AH173-WG-7-A pinout, AH173-WG-7-A application, or AH173-WG-7-A equivalent, this page provides verified magnetic thresholds, thermal derating curves, internal Rpu value (7–13 kΩ), VOUT saturation voltage (≤400 mV @ 10mA), and confirmed SC59 footprint compatibility per Diodes' package outline AP02008.
Technical Context
The AH173 implements a bipolar latch architecture: output switches low when south-pole flux exceeds Bop (15–60 G), remains latched until reversed field falls below Brp (–60 to –15 G), delivering 80 G hysteresis for robust noise immunity. Its on-chip bandgap regulator enables stable operation across 3–20 V supply and full temperature range.
Magnetic switching is referenced to the branded side of the package; polarity response is fixed (south-pole activation). The integrated 7–13 kΩ pullup eliminates external biasing, simplifying PCB layout while maintaining TTL/CMOS-compatible logic levels at the open-collector OUT pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3 V to 20 V - supports direct connection to 12 V automotive rails or industrial 24 V systems without external regulation |
| Output Sink Current | 25 mA - drives standard logic inputs or small relays directly without buffer stage |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial motor control environments |
| Magnetic Hysteresis | 80 Gauss - prevents chatter during slow or noisy magnetic transitions in rotating machinery |
| Internal Pullup Resistor | 7–13 kΩ - eliminates need for external pullup, reducing BOM count and board space in compact designs |
| VOUT Saturation Voltage | ≤400 mV @ 10 mA - ensures clean low-state logic recognition even with marginal supply margins |
| Power Dissipation (SC59) | 230 mW @ 25°C, derates to 0 mW at 150°C - defines maximum continuous drive capability in SOT23 footprint |
Pinout & Package
The AH173-WG-7-A is housed in SC59 package (commonly known as SOT23 in Asia), with 3-pin single-ended open-collector output configuration and standardized lead pitch of 0.95 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Positive Power Supply | Input for 3–20 V DC; powers internal regulator, amplifier, comparator, and output driver |
| GND | Ground Reference | Return path for supply current and magnetic sensor bias; must be low-impedance for noise immunity |
| OUT | Open-Collector Output | Sinks up to 25 mA when active; requires external load or relies on internal Rpu (7–13 kΩ) for pullup |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar Latch Functionality | Retains output state after magnetic trigger until opposite polarity field resets it - ideal for direction-agnostic rotation counting |
| Integrated Pullup Resistor | 7–13 kΩ on-chip resistor eliminates discrete component, reducing layout complexity and failure modes in high-vibration environments |
| Wide Supply Range | 3–20 V operation accommodates unregulated battery inputs and legacy 12 V systems without auxiliary regulators |
| High-Temperature Operation | Specified performance from –40°C to +125°C ambient - validated for placement near motors or power electronics |
| Green & RoHS Compliance | Halogen- and antimony-free, lead-free construction meets EU RoHS 3 (2015/863/EU) and automotive change-control requirements |
Applications
| Three-Phase BLDC Motor Commutation | Rotor Position Sensing |
|---|---|
Use Scenario: Detecting rotor pole position in electric power steering (EPS) and HVAC blower motors to sequence phase winding energization. IC Role / Device Role / Timing Role: Digital Hall latch providing edge-triggered commutation signals synchronized to mechanical rotation. Use Value: Enables precise 120° electrical phase alignment with <80 G hysteresis preventing false triggering during torque ripple. | Use Scenario: Monitoring crankshaft or camshaft angular position in engine management systems. IC Role / Device Role / Timing Role: Bipolar latch generating deterministic ON/OFF transitions per pole passage for ECU timing reference. Use Value: Delivers repeatable Bop/Brp thresholds (±15–60 G) across –40°C to +125°C, ensuring cold-start reliability. |
| Current Switch Interface | RPM Detection in Industrial Fans |
Use Scenario: Converting magnetic actuation from reed-switch replacements or ferrous target wheels into digital enable/disable signals. IC Role / Device Role / Timing Role: Solid-state switch replacing electromechanical components in safety-critical interlocks and limit detection. Use Value: 25 mA sink current drives PLC inputs directly; internal Rpu removes external biasing, improving MTBF. | Use Scenario: Measuring rotational speed of cooling fans in telecom base stations and server racks. IC Role / Device Role / Timing Role: Pulse generator producing frequency-proportional output for tachometer feedback and thermal throttling control. Use Value: Stable 80 G hysteresis ensures accurate pulse counting at low RPM (<100 rpm) despite vibration-induced field fluctuations. |
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 | Supports low-voltage microcontroller interfaces and automotive PPAP-compliant designs | Select when new designs require AEC-Q100 qualification or tighter magnetic threshold control |
| AH3724A | Same package as AH3722A but with wider Bop range (10–70 G); identical AEC-Q100 Grade 0 rating | Better suited for variable-air-gap or high-tolerance mechanical assemblies | Choose for applications requiring extended magnetic operate point tolerance without sacrificing qualification status |
Compared with AH173-WG-7-A, both AH3722A and AH3724A offer AEC-Q100 qualification, lower minimum supply voltage, and tighter production binning - making them suitable for new automotive and industrial designs where long-term supply assurance and change control are mandatory.
Availability
AH173-WG-7-A is available at Aetrix Electronics and suitable for three-phase BLDC motor commutation, rotor position sensing, current switch interfaces, and RPM detection requiring stable component supply in high-temperature environments.
Supply support for AH173-WG-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The AH173 belongs to Diodes' Hall-effect sensor product line, engineered specifically for contactless position and speed sensing in automotive and industrial motor control systems where reliability under thermal stress is critical.
FAQ
What is the magnetic polarity sensitivity of AH173-WG-7-A?
The AH173-WG-7-A responds to south-pole magnetic fields applied to its branded surface. It switches ON (pulls OUT low) when flux density exceeds the operate point (Bop), and remains latched until a reverse (north-pole) field reduces flux below the release point (Brp). Polarity response is fixed and non-reversible per device design.
Can AH173-WG-7-A operate without an external pullup resistor?
Yes. The AH173-WG-7-A integrates a 7–13 kΩ pullup resistor (Rpu) internally, enabling direct connection of the OUT pin to loads without external biasing. This simplifies circuit design and improves reliability in space-constrained or high-vibration applications where discrete resistors may fail.
Is AH173-WG-7-A qualified for automotive use?
No. While AH173-WG-7-A operates across –40°C to +125°C and meets RoHS/Green standards, it is not AEC-Q100 qualified and is marked NRND (Not Recommended for New Design). For automotive applications, Diodes recommends AH3722A or AH3724A, which are AEC-Q100 Grade 0 qualified and PPAP-capable.
What is the thermal derating behavior of AH173-WG-7-A in SC59 package?
In SC59 (SOT23) package, AH173-WG-7-A has a maximum power dissipation of 230 mW at 25°C, linearly derating to 0 mW at 150°C. At 125°C ambient, allowable dissipation is 55 mW - limiting continuous sink current to ~13 mA at 12 V supply to maintain safe junction temperature.
AH173-WG-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:
- Active
- 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-WG-7-A FAQ
1.How can I place an order for AH173-WG-7-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH173-WG-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-WG-7-A reliable?
The price and inventory of AH173-WG-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-WG-7-A is usually 5 days.
3.What payment methods are accepted for AH173-WG-7-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH173-WG-7-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH173-WG-7-A?
AH173-WG-7-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH173-WG-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-WG-7-A?
For technical support, including AH173-WG-7-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH173-WG-7-A requirements.
6.How does Aetrix verify that AH173-WG-7-A is sourced from the original manufacturer or authorized distributors?
All AH173-WG-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-WG-7-A meets industry standards.
7.What is the process for return or replacement of AH173-WG-7-A?
All AH173-WG-7-A units undergo pre-shipment inspection (PSI). If there is an issue with AH173-WG-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-WG-7-A part is unused and in its original packaging.
Return procedure for AH173-WG-7-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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