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Diodes Incorporated AH173-PL-A-A
- Part No.:
- AH173-PL-A-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP, Formed Leads
- Datasheet:
-
AH173-PL-A-A.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
AH173-PL-A-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 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 supports –40°C to +125°C ambient operation in SIP-3 and SC59 packages.
For engineers reviewing the AH173-PL-A-A datasheet, AH173-PL-A-A pinout, AH173-PL-A-A application, or AH173-PL-A-A equivalent, this page provides verified magnetic thresholds, thermal derating curves, package-specific power dissipation limits, internal Rpu value (7–13 kΩ), and functional substitution guidance against AH3722A/AH3724A.
Technical Context
The AH173 integrates a Hall voltage generator, amplifier, comparator with hysteresis (80 Gauss typical), and open-collector output stage with built-in pullup resistor (Rpu). Its bandgap-regulated internal supply enables stable operation across 3–20V input while maintaining magnetic switching accuracy over temperature.
It functions as a digital latch: output switches low when B > Bop (South pole facing branded side), remains latched until B reverses and falls below Brp, ensuring robust noise immunity in electrically noisy motor environments. Magnetic polarity sensitivity and thermal compensation are inherent to its analog front-end architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3V to 20V DC - supports direct connection to automotive battery rails without external regulation. |
| Output Sink Current | 25mA - drives standard logic inputs or small relays directly without external buffer. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood and industrial motor control environments. |
| Magnetic Hysteresis | 80 Gauss typical - prevents chatter during slow or noisy magnetic transitions near threshold. |
| Internal Pullup Resistor | 7–13 kΩ - eliminates need for external pullup, reducing BOM count and PCB area. |
| Output Saturation Voltage | ≤400 mV at 10mA - ensures clean TTL/CMOS-compatible low-state with minimal power loss. |
| Supply Current (Off) | 3.5–6 mA at 12V - enables low-quiescent-power operation in always-on sensing nodes. |
Pinout & Package
Available in SIP-3 (straight or spread lead) and SC59 (SOT-23 equivalent) packages. SIP-3 uses 3-pin single-inline configuration; SC59 uses standard SOT-23 footprint with same pinout orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Positive Power Supply | Input for regulated 3–20V supply; powers internal bandgap regulator and signal chain. |
| GND | Ground Reference | Return path for supply and output current; must be low-impedance for stable magnetic sensing. |
| OUT | Open-Collector Output | Sinks up to 25mA when active; requires external load or relies on internal Rpu for logic-high default state. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar Latching Operation | Retains output state after magnetic trigger until opposite polarity field resets it - ideal for direction-agnostic rotation counting. |
| Integrated Pullup Resistor | 7–13 kΩ internal Rpu eliminates discrete component, simplifying layout and improving reliability in vibration-prone motor mounts. |
| Wide Voltage Range | 3–20V operation accommodates 5V microcontroller interfaces and 12/24V automotive systems without level-shifting. |
| High-Temperature Stability | Guaranteed performance to +125°C ambient with thermal derating - validated for continuous use in sealed motor housings. |
| RoHS/Green Compliance | Lead-free, halogen-free, antimony-free construction meets global environmental mandates without performance trade-offs. |
Applications
| Motor Rotor Position Sensing | Brushless DC Motor Commutation |
|---|---|
|
Use Scenario: Detecting magnet polarity on rotating shafts in HVAC blowers and power tools. IC Role / Device Role / Timing Role: Digital latch providing edge-triggered phase signals synchronized to rotor angular position. Use Value: Enables precise 6-step commutation without encoder feedback, reducing system cost and complexity. |
Use Scenario: Providing hall signals to motor driver ICs (e.g., DRV8305) in e-bike controllers. IC Role / Device Role / Timing Role: Generating three-phase timing references with 120° electrical spacing for synchronous switching. Use Value: Delivers deterministic timing with 80-Gauss hysteresis, minimizing torque ripple under variable load conditions. |
| Current Switch Monitoring | RPM Detection in Industrial Pumps |
|
Use Scenario: Sensing actuation of solenoid-driven valves via embedded magnets in factory automation. IC Role / Device Role / Timing Role: Latching switch indicating valve open/closed state with immunity to EMI from nearby contactors. Use Value: Eliminates mechanical switch wear and bounce; operates reliably at 125°C near hydraulic manifolds. |
Use Scenario: Measuring impeller speed in coolant circulation pumps for data center liquid cooling systems. IC Role / Device Role / Timing Role: Pulse generator delivering frequency-proportional output for closed-loop speed control. Use Value: Maintains ±5% accuracy across –40°C to +105°C operating range with no calibration required. |
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 Bop/Brp sensitivity (±25–80 Gauss), lower ICC (2.5mA typ), SC59-only package | Optimized for low-power battery-operated encoders; lacks SIP-3 option | Select for new designs requiring extended magnetic range and reduced quiescent consumption |
| AH3724A | Same sensitivity as AH3722A but rated to AEC-Q100 Grade 1 (–40°C to +125°C), automotive-qualified | Approved for automotive powertrain and chassis systems with PPAP support | Choose when automotive qualification, change control, or IATF 16949 traceability is mandatory |
Compared with AH173-PL-A-A, AH3722A offers improved magnetic sensitivity and lower power draw in SC59 only, while AH3724A adds AEC-Q100 qualification and full automotive change control - both eliminate the NRND status and extend long-term supply assurance.
Availability
AH173-PL-A-A is available at Aetrix Electronics and suitable for motor commutation, RPM monitoring, and industrial position sensing requiring stable component supply despite its Not Recommended for New Design (NRND) status.
Supply support for AH173-PL-A-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 AH173 belongs to Diodes' Hall-effect sensor product line, engineered specifically for ruggedized magnetic position feedback in high-temperature motor control and industrial automation systems.
FAQ
Is AH173-PL-A-A RoHS and REACH compliant?
Yes. AH173-PL-A-A is fully RoHS 3 (2015/863/EU) compliant, lead-free, halogen-free (<900 ppm Br/Cl, <1000 ppm Sb), and classified as a "Green" device per Diodes Incorporated's definitions. Certificate of Compliance is available upon request.
What is the maximum allowable junction temperature for AH173-PL-A-A?
The absolute maximum junction temperature (TJ) is +150°C. Derated power dissipation must be applied above +25°C ambient: SIP-3 packages support 550 mW at 25°C, decreasing linearly to 0 mW at +150°C; SC59 supports 230 mW at 25°C, reaching 0 mW at +150°C.
Can AH173-PL-A-A replace AH3722A in existing designs?
No - AH173-PL-A-A is not a drop-in replacement for AH3722A. While both are Hall latches, AH3722A has different magnetic thresholds (±25–80 Gauss vs. ±15–60 Gauss), lower supply current, and only SC59 packaging. Electrical and thermal behavior differ significantly; redesign validation is required.
Why is AH173-PL-A-A marked "Not Recommended for New Design"?
Diodes Incorporated designated AH173 as NRND because newer alternatives (AH3722A/AH3724A) offer superior magnetic sensitivity, lower power consumption, AEC-Q100 qualification (for AH3724A), and enhanced long-term supply assurance. AH173 remains available for legacy support and existing production.
AH173-PL-A-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP, Formed Leads
- Packaging:
- Cut Tape (CT)
- 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:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH173-PL-A-A FAQ
1.How can I place an order for AH173-PL-A-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH173-PL-A-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-PL-A-A reliable?
The price and inventory of AH173-PL-A-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-PL-A-A is usually 5 days.
3.What payment methods are accepted for AH173-PL-A-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH173-PL-A-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH173-PL-A-A?
AH173-PL-A-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH173-PL-A-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-PL-A-A?
For technical support, including AH173-PL-A-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH173-PL-A-A requirements.
6.How does Aetrix verify that AH173-PL-A-A is sourced from the original manufacturer or authorized distributors?
All AH173-PL-A-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-PL-A-A meets industry standards.
7.What is the process for return or replacement of AH173-PL-A-A?
All AH173-PL-A-A units undergo pre-shipment inspection (PSI). If there is an issue with AH173-PL-A-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-PL-A-A part is unused and in its original packaging.
Return procedure for AH173-PL-A-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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