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Diodes Incorporated AH173-PL-A-B
- Part No.:
- AH173-PL-A-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- -
- Datasheet:
-
AH173-PL-A-B.pdf
- Description:
- IC HALL SENSOR LATCH 25MA SIP-3L
- Quantity:
- Payment:
- Shipping:
Inventory:1,318
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Product details
Overview
AH173-PL-A-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 3-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.
For engineers reviewing the AH173-PL-A-B datasheet, AH173-PL-A-B pinout, AH173-PL-A-B application, or AH173-PL-A-B equivalent, this page provides verified technical context, package-specific pin definitions, magnetic switching behavior, thermal derating curves, and validated alternatives for legacy motor control designs.
Technical Context
The AH173 implements a fully integrated Hall latch architecture: on-chip Hall element generates voltage proportional to magnetic flux density; amplifier boosts signal; comparator with built-in hysteresis (≥80 Gauss) rejects noise; open-drain output stage includes internal 7–13 kΩ pullup resistor (Rpu) and supports 25mA sink current at ≤400mV saturation voltage.
Its bandgap-regulated internal supply enables stable operation over 3–20V input range and full –40°C to +125°C ambient temperature, with junction temperature limited to +150°C. Magnetic thresholds are polarity-sensitive (South pole to branded side), and switching is latched until field reversal crosses release point (Brp).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3V to 20V DC - supports direct connection to automotive battery rails or industrial 12V/24V systems without external regulation. |
| Output Sink Current | 25mA - drives standard logic inputs or small relays directly; eliminates need for external buffer transistor. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial motor drive environments. |
| Magnetic Hysteresis | ≥80 Gauss - ensures robust noise immunity in electrically noisy motor control applications. |
| Internal Pullup Resistor | 7–13 kΩ - reduces BOM count by eliminating external pullup; sets logic-high level when output is off. |
| Output Saturation Voltage | ≤400mV at 10mA - guarantees clean low-state TTL/CMOS compatibility even under load. |
| Power Dissipation (SC59) | 230 mW at 25°C, derates linearly to 0 mW at 150°C - defines maximum continuous power handling in SOT23 footprint. |
Pinout & Package
Available in SC59 (SOT23-equivalent) and SIP-3 packages; AH173-PL-A-B uses SC59 package with gull-wing leads and branded-side marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Positive Power Supply | Input for 3–20V regulated or unregulated supply; powers internal regulator and sensing circuitry. |
| GND | Ground Reference | Common return path for Hall element, amplifier, comparator, and output driver; must be low-impedance. |
| OUT | Open-Drain Digital Output | Sinks up to 25mA when active (low); pulled high internally via Rpu when inactive; requires no external pullup. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar Latching Operation | Switches ON at Bop ≥15 Gauss (South pole), holds state until Brp ≤–15 Gauss - enables precise commutation timing in BLDC motors. |
| Integrated Pullup Resistor | 7–13 kΩ internal Rpu - removes external component, simplifies PCB layout, and maintains consistent logic-high level across temperature. |
| Wide Supply Range | 3V–20V operation - accommodates 5V microcontroller interfaces and 12V/24V motor drive subsystems without level-shifting. |
| High-Temperature Stability | Specified performance from –40°C to +125°C with bandgap-regulated core - ensures reliable switching in engine bay or industrial enclosures. |
| RoHS/Green Compliance | Fully lead-free, halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb) - meets global environmental compliance requirements. |
Applications
| BLDC Motor Commutation | Automotive Fan Speed Sensing |
|---|---|
|
Use Scenario: Detecting rotor magnet position in 3-phase brushless DC motors for electronic commutation. IC Role / Device Role / Timing Role: Digital Hall latch providing synchronized edge-triggered signals to motor driver ICs (e.g., DRV830x). Use Value: Enables precise 120° electrical phase alignment with <±5° timing error over full temperature range due to stable Bop/Brp hysteresis. |
Use Scenario: Monitoring rotational speed of radiator cooling fans in passenger vehicles. IC Role / Device Role / Timing Role: Magnetic RPM sensor generating pulse train proportional to fan shaft rotation. Use Value: Delivers clean, jitter-free pulses up to 20kHz with 25mA sink drive into ECU input, surviving under-hood thermal cycling. |
| Industrial Conveyor Belt Encoder | Home Appliance Drum Position Detection |
|
Use Scenario: Counting gear teeth or detecting metal flag presence on conveyor drive shafts. IC Role / Device Role / Timing Role: Contactless position switch triggering PLC input modules or motion controllers. Use Value: Operates reliably at 85°C ambient with 230mW SC59 thermal limit, eliminating mechanical switch wear and bounce. |
Use Scenario: Determining drum orientation in washing machines during spin cycle balancing routines. IC Role / Device Role / Timing Role: Latched Hall sensor detecting permanent magnet position on rotating drum assembly. Use Value: Maintains accurate position hold through vibration and thermal drift using ≥80 Gauss hysteresis, reducing false triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall latch sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3722A | Higher sensitivity (Bop: 3–12 Gauss), lower VCC min (2.5V), SC59-only, no internal pullup (requires external 10kΩ). | Optimized for low-field, battery-powered devices; lacks integrated pullup, increasing BOM count. | Select when operating below 3V or requiring finer magnetic resolution; redesign required for pullup removal. |
| AH3724A | Same package and pinout as AH173, includes internal pullup, wider Bop range (2–15 Gauss), AEC-Q100 Grade 0 qualified (–40°C to +150°C). | Qualified for automotive safety-critical systems; supports higher junction temperature and tighter magnetic tolerance. | Drop-in replacement for new designs requiring AEC-Q100 compliance and extended thermal margin. |
Compared with AH173-PL-A-B, AH3722A offers lower-voltage operation but adds external component overhead, while AH3724A provides AEC-Q100 qualification, extended temperature range, and identical SC59 pinout-making it the preferred upgrade path for automotive and industrial upgrades.
Availability
AH173-PL-A-B is available at Aetrix Electronics and suitable for BLDC motor commutation, automotive fan speed sensing, industrial conveyor belt encoding, and home appliance drum position detection requiring stable component supply despite NRND status.
Supply support for AH173-PL-A-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, specializing in high-reliability power management, signal integrity, and sensing solutions for automotive, industrial, and consumer markets.
The AH173 belongs to Diodes' Hall-effect sensor product line, engineered specifically for contactless position and speed sensing in harsh thermal environments-prioritizing latch stability, magnetic noise immunity, and wide-supply operation in motor control systems.
FAQ
What is the magnetic polarity requirement for AH173-PL-A-B activation?
The AH173-PL-A-B activates when a South pole approaches the branded side of the package, with typical operate point (Bop) between 15–60 Gauss and release point (Brp) between –60 to –15 Gauss. North pole exposure does not trigger switching. Polarity sensitivity is fixed per device grade (A or B) and cannot be reversed via configuration.
Can AH173-PL-A-B be used without an external pullup resistor?
Yes. AH173-PL-A-B integrates a 7–13 kΩ internal pullup resistor (Rpu) connected between Vcc and OUT, enabling direct interface to logic inputs without external components. This eliminates BOM cost and layout area, and ensures consistent high-level voltage across temperature and supply variations.
Why is AH173 marked "Not Recommended for New Designs"?
AH173 is designated NRND because Diodes Incorporated has introduced enhanced successors-AH3722A and AH3724A-with improved sensitivity, AEC-Q100 qualification, and broader magnetic specifications. While AH173 remains fully functional and supported for existing production, new designs should adopt AH3724A for long-term supply assurance and automotive compliance.
How does thermal derating affect AH173-PL-A-B in SC59 package?
In SC59 (SOT23) package, AH173-PL-A-B's power dissipation drops linearly from 230 mW at 25°C to 0 mW at 150°C. At 100°C ambient, maximum allowable power is 92 mW. Designers must calculate I²R losses and junction temperature rise using θJA = 108.7°C/W to ensure TJ ≤ 150°C under worst-case load and airflow conditions.
AH173-PL-A-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Function:
- -
- Technology:
- -
- Polarization:
- -
- Sensing Range:
- -
- Test Condition:
- -
- Voltage - Supply:
- -
- Current - Supply (Max):
- -
- Current - Output (Max):
- -
- Output Type:
- -
- Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
AH173-PL-A-B FAQ
1.How can I place an order for AH173-PL-A-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH173-PL-A-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-PL-A-B reliable?
The price and inventory of AH173-PL-A-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-PL-A-B is usually 5 days.
3.What payment methods are accepted for AH173-PL-A-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH173-PL-A-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH173-PL-A-B?
AH173-PL-A-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH173-PL-A-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-PL-A-B?
For technical support, including AH173-PL-A-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH173-PL-A-B requirements.
6.How does Aetrix verify that AH173-PL-A-B is sourced from the original manufacturer or authorized distributors?
All AH173-PL-A-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-PL-A-B meets industry standards.
7.What is the process for return or replacement of AH173-PL-A-B?
All AH173-PL-A-B units undergo pre-shipment inspection (PSI). If there is an issue with AH173-PL-A-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-PL-A-B part is unused and in its original packaging.
Return procedure for AH173-PL-A-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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