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Diodes Incorporated AH173-PG-A-A
- Part No.:
- AH173-PG-A-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP, Formed Leads
- Datasheet:
-
AH173-PG-A-A.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,615
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Product details
Overview
AH173-PG-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 output sink current, and functions across −40°C to +125°C. Its magnetic operate point (Bop) ranges 15–60 Gauss (A-grade), with 80 Gauss hysteresis for robust noise immunity.
For engineers reviewing the AH173-PG-A-A datasheet, AH173-PG-A-A pinout, AH173-PG-A-A application, or AH173-PG-A-A equivalent, this page provides verified technical context, package-specific thermal derating curves, magnetic switching thresholds, internal Rpu value, and validated alternatives for legacy motor-sensing designs.
Technical Context
The AH173 integrates a Hall voltage generator, amplifier, comparator with built-in hysteresis, and open-collector output stage with a 7–13 kΩ internal pullup resistor (Rpu). Its bandgap-regulated supply enables stable operation across its full 3–20 V range and temperature span.
It latches ON when magnetic flux density exceeds Bop (e.g., 15–60 G for A-grade), holds state until flux reverses and falls below Brp (−60 to −15 G), then releases - enabling reliable edge detection in rotating magnetic fields without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3 V to 20 V DC - supports direct connection to 12 V automotive or industrial rails without external regulation |
| Output Sink Current | 25 mA - drives standard logic inputs or small relays directly; no external transistor required |
| 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 field transitions in encoder/rotor applications |
| Internal Pullup Resistor | 7–13 kΩ - eliminates need for external pullup; sets default HIGH state and defines rise time with load capacitance |
| Output Saturation Voltage | ≤400 mV at 10 mA - ensures clean LOW-level logic compatibility with 3.3 V or 5 V microcontrollers |
| Supply Current (OFF) | 3.5–6 mA - low quiescent draw suitable for always-on sensing in battery-backed systems |
Pinout & Package
Available in SIP-3 (straight-lead bulk pack) and SC59 (SOT23-equivalent) packages. SIP-3 uses 3-pin single-inline configuration with 2.57 mm height and 14–15 mm lead length; SC59 has 3-pin surface-mount footprint (2.8 × 2.9 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Positive power supply input | Accepts 3–20 V; powers internal regulator, Hall element, and output driver |
| GND | Ground reference | Return path for supply and output current; must be low-impedance for noise immunity |
| OUT | Open-collector digital output | Sinks up to 25 mA when active; pulled HIGH internally via Rpu when inactive |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | Requires alternating North/South pole exposure to toggle - ideal for direction-agnostic RPM counting |
| Integrated 7–13 kΩ pullup | Reduces BOM count and PCB area; eliminates risk of incorrect external resistor selection |
| −40°C to +125°C operation | Validated performance across full automotive ambient range without derating penalties |
| 80 Gauss magnetic hysteresis | Guarantees bounce-free switching in vibration-prone motor housings and gear-driven encoders |
| RoHS-compliant & halogen-free | Meets EU Directive 2015/863/EU with <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - certified "Green" device |
Applications
| Motor Rotor Position Sensing | Three-Phase BLDC Commutation |
|---|---|
|
Use Scenario: Detecting magnet polarity on rotating motor shaft to determine rotor angle for electronic commutation. IC Role / Device Role / Timing Role: Digital latch providing synchronized edge-triggered signals aligned to magnetic pole transitions. Use Value: Enables precise 120° electrical phase alignment using only two sensors per motor, reducing system cost vs. resolver-based solutions. |
Use Scenario: Providing hall signals to motor driver ICs (e.g., DRV8305) for real-time phase sequencing in fan, pump, or compressor drives. IC Role / Device Role / Timing Role: High-noise-immunity digital input source with guaranteed timing margin between Bop and Brp transitions. Use Value: Eliminates need for external Schmitt triggers or RC filtering, simplifying layout and improving startup reliability. |
| Rotary Encoder Feedback | RPM Monitoring in Industrial Gearboxes |
|
Use Scenario: Counting gear teeth or magnetized encoder rings in servo actuators and CNC positioning stages. IC Role / Device Role / Timing Role: Edge-detecting latch with fixed hysteresis, delivering deterministic pulse timing independent of slew rate. Use Value: Supports >10 kHz pulse rates at 125°C ambient due to fast comparator response and low VCE(sat). |
Use Scenario: Measuring rotational speed of high-temp gearbox shafts in mining, oil & gas, or HVAC systems. IC Role / Device Role / Timing Role: Ambient-hardened magnetic switch interfacing directly to PLC input modules or microcontroller timers. Use Value: Operates reliably at 125°C without heatsinking or derating - unlike many competitors requiring external biasing. |
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 G typical), lower ICC (2.5 mA), SC59-only packaging | Optimized for low-power, space-constrained designs; lacks SIP-3 option | Select when upgrading from AH173 in new layouts where SIP-3 is not required and tighter magnetic thresholds improve signal margin |
| AH3724A | Wider Bop range (±5 to ±100 G), programmable hysteresis, same SC59 package | Supports variable air-gap or multi-magnet configurations; requires external configuration resistors | Choose when field strength varies significantly across units or over lifetime, requiring adjustable trip points |
Compared with AH173-PG-A-A, AH3722A offers lower power and tighter magnetic specs in SC59 only, while AH3724A adds configurability at the cost of added external components - both eliminate the SIP-3 form factor and require layout revision.
Availability
AH173-PG-A-A is available at Aetrix Electronics and suitable for legacy motor control, industrial encoder retrofitting, and high-temperature RPM monitoring requiring stable component supply despite NRND status.
Supply support for AH173-PG-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 power management, signal integrity, and sensing solutions for automotive and industrial markets.
The AH173 belongs to Diodes' Hall-effect sensor product line, engineered specifically for contactless position and speed sensing in harsh thermal environments where mechanical switches fail.
FAQ
Is AH173-PG-A-A still in production?
No - AH173-PG-A-A is Not Recommended for New Designs (NRND) per Diodes' ordering information. However, Aetrix Electronics maintains active inventory and supports legacy production runs with traceable, date-code-controlled stock and extended lifecycle coordination.
Can AH173-PG-A-A replace AH173-PG-B-B in the same PCB?
Yes - both share identical SIP-3 (Bulk Pack) package, pinout, and electrical specifications. The "A" and "B" suffixes denote packing format (Ammo vs. Bulk) and green compliance coding, not functional differences. No layout change is needed.
What is the maximum allowable junction temperature during continuous operation?
The absolute maximum junction temperature is +150°C. At +125°C ambient, the SIP-3 package supports 220 mW dissipation (per datasheet derating curve), limiting continuous output current to ~18 mA at 12 V supply to stay within thermal limits.
Does AH173-PG-A-A require an external capacitor on Vcc?
No - the internal bandgap regulator does not mandate an external bypass capacitor per the datasheet. However, a 100 nF ceramic capacitor placed ≤5 mm from Vcc/GND pins is recommended to suppress high-frequency noise in electrically noisy motor environments.
AH173-PG-A-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP, Formed Leads
- Packaging:
- Tape & Box (TB)
- 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:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH173-PG-A-A FAQ
1.How can I place an order for AH173-PG-A-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH173-PG-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-PG-A-A reliable?
The price and inventory of AH173-PG-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-PG-A-A is usually 5 days.
3.What payment methods are accepted for AH173-PG-A-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH173-PG-A-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH173-PG-A-A?
AH173-PG-A-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH173-PG-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-PG-A-A?
For technical support, including AH173-PG-A-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH173-PG-A-A requirements.
6.How does Aetrix verify that AH173-PG-A-A is sourced from the original manufacturer or authorized distributors?
All AH173-PG-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-PG-A-A meets industry standards.
7.What is the process for return or replacement of AH173-PG-A-A?
All AH173-PG-A-A units undergo pre-shipment inspection (PSI). If there is an issue with AH173-PG-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-PG-A-A part is unused and in its original packaging.
Return procedure for AH173-PG-A-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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