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Home > Products > Sensors, Transducers > Magnetic Sensors > Switches (Solid State)

Diodes Incorporated AH173-PG-B-A

Name: AH173-PG-B-A
Brand: Diodes Incorporated
SKU: AH173-PG-B-A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AH173-PG-B-A

Manufacturer:: Diodes Incorporated

Category:: Switches (Solid State)

Package:: 3-SIP

Datasheet:: AH173-PG-B-A.pdf

Description:: MAGNETIC SWITCH LATCH 3SIP

Quantity:: RFQ Add To RFQ list

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Inventory:1,762

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Product details

Overview

AH173-PG-B-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 functions across –40°C to +125°C.

For engineers reviewing the AH173-PG-B-A datasheet, AH173-PG-B-A pinout, AH173-PG-B-A application, or AH173-PG-B-A equivalent, this page provides verified technical context, package-specific pin mapping, magnetic switching behavior, thermal derating curves, and validated alternatives for legacy motor-sensing designs.

Technical Context

The AH173 integrates a Hall voltage generator, amplifier, comparator with built-in hysteresis (80 Gauss typical), and open-collector output stage with internal 7–13 kΩ pullup resistor. Its bandgap-regulated internal supply enables stable operation across the full 3–20 V_CC range.

Magnetic switching is bipolar: output pulls low when south-pole flux exceeds B_op (15–60 G), and remains latched until reverse flux falls below B_rp (–60 to –15 G). Saturation voltage is ≤400 mV at 10 mA sink, and supply current is ≤6 mA in off-state.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	3 V to 20 V DC - supports wide-input industrial and automotive power rails without external regulation
Output Sink Current	25 mA - drives logic-level inputs or small relays directly without external buffer
Operating Temperature	–40°C to +125°C - qualified for under-hood and motor-adjacent placement in automotive BLDC systems
Magnetic Hysteresis	80 Gauss typical - prevents chatter near switching threshold in noisy electromagnetic environments
Internal Pullup Resistor	7–13 kΩ - eliminates need for external pullup, reducing BOM count and PCB area
Output Saturation Voltage	≤400 mV at 10 mA - ensures clean TTL/CMOS-compatible low-state margin even at elevated temperature
Supply Current (Off-State)	≤6 mA at 12 V - enables low-quiescent-power operation in always-on sensing nodes

Pinout & Package

Package: SIP-3 (Bulk Pack) - straight-lead, through-hole mounting with 14.0–15.0 mm body length, optimized for high-reliability motor assembly and wave soldering.

Pin/Terminal	Circuit Role	Design Meaning
Vcc	Positive Power Supply	Input for 3–20 V DC; powers internal regulator, amplifier, and comparator stages
GND	Ground Reference	Return path for supply current and output sink current; must be low-impedance for noise immunity
OUT	Open-Collector Output	Sinks up to 25 mA when active; pulled high internally via Rpu; requires no external pullup

Key Features

Feature	Design Value
Bipolar Latching Operation	Holds output state until magnetic polarity reversal crosses release point - enables robust position memory in rotating systems
Integrated Pullup Resistor	7–13 kΩ on-chip - reduces component count, improves layout repeatability, and eliminates pullup tolerance drift
High-Temperature Stability	Specified performance maintained to +125°C ambient - supports direct mounting on motor housings or power modules
Wide Supply Range	3–20 V operation - accommodates 5 V logic rails, 12 V automotive systems, and unregulated industrial supplies
RoHS & Green Compliant	Lead-free, halogen-free, antimony-free - meets global environmental compliance requirements without derating penalties

Applications

BLDC Motor Rotor Position Sensing

Automotive Fan Speed Monitoring

Use Scenario: Detecting magnetic pole transitions on rotating shafts in 3-phase brushless DC motors.

IC Role / Device Role / Timing Role: Digital latch providing commutation timing signals to motor driver ICs.

Use Value: Enables precise 120° electrical phase alignment with <±15 G operate tolerance and 80 G hysteresis for jitter-free switching.

Use Scenario: Measuring fan blade passage frequency in engine cooling or HVAC blowers.

IC Role / Device Role / Timing Role: Edge-triggered RPM counter input with latched output for microcontroller GPIO capture.

Use Value: Delivers reliable low-speed counting down to 0 RPM hold state, supported by –40°C to +125°C operation near hot components.

Industrial Conveyor Belt Speed Control

Power Tool Motor Commutation Feedback

Use Scenario: Monitoring gear tooth or magnet rotation on conveyor drive shafts for closed-loop speed regulation.

IC Role / Device Role / Timing Role: Magnetic zero-crossing detector feeding PLC or motion controller timing inputs.

Use Value: Maintains consistent B_op/B_rp thresholds across temperature swings, minimizing recalibration needs in factory environments.

Use Scenario: Providing Hall feedback for electronic commutation in cordless drill and angle grinder motors.

IC Role / Device Role / Timing Role: Latched digital position signal synchronized to rotor angular position for FET gate sequencing.

Use Value: 25 mA sink capability drives gate drivers directly; internal pullup avoids external resistor in space-constrained tool PCBs.

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 (B_op: ±10–40 G), lower V_CC min (2.5 V), SC59-only packaging	Optimized for battery-powered tools and compact encoders where SIP-3 footprint is prohibitive	Select when upgrading from AH173 in new designs requiring smaller size, lower voltage, or improved noise margin
AH3724A	Wider magnetic hysteresis (120 G typ), extended temp range (–40°C to +150°C), same SC59 package	Targeted at high-heat zones like inverter-integrated motor controllers and EV traction systems	Choose for next-gen automotive or industrial systems demanding enhanced thermal margin and magnetic noise immunity

Compared with AH173-PG-B-A, AH3722A offers smaller form factor and lower voltage operation but lacks SIP-3 packaging, while AH3724A provides superior thermal and magnetic robustness at the cost of footprint compatibility - both require PCB redesign but deliver measurable reliability gains in new deployments.

Availability

AH173-PG-B-A is available at Aetrix Electronics and suitable for BLDC motor control, automotive fan monitoring, industrial conveyor speed regulation, and power tool commutation feedback requiring stable component supply despite its NRND status.

Supply support for AH173-PG-B-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 industrial and automotive markets.

The AH173 belongs to Diodes' Hall-effect sensor product line, engineered specifically for contactless position and speed sensing in harsh thermal and electromagnetic environments of motor-driven systems.

FAQ

Is AH173-PG-B-A still in production?

No - AH173-PG-B-A is marked NRND (Not Recommended for New Design) per Diodes' ordering information. It remains available for legacy production and repair, but Diodes recommends AH3722A or AH3724A for new designs due to improved specs and ongoing support.

What is the difference between SIP-3 (Bulk Pack) and SIP-3 (Ammo Pack)?

SIP-3 Bulk Pack uses straight leads for automated insertion and wave soldering, while Ammo Pack uses spread leads for manual or selective soldering. Both share identical die and electrical specs; only leadform and packaging differ - AH173-PG-B-A is the Bulk Pack variant.

Can AH173-PG-B-A replace AH173-PG-A-A in an existing design?

Yes - both share identical electrical characteristics, magnetic thresholds, and SIP-3 package dimensions. The only differences are packaging format (bulk vs. ammo box) and quantity per unit (1000 vs. 4000); no PCB or schematic changes are required for substitution.

Does AH173-PG-B-A require an external pullup resistor?

No - it includes an internal 7–13 kΩ pullup resistor on the OUT pin. This eliminates the need for external components, simplifies layout, and ensures consistent rise time and noise immunity without board-level tolerance dependencies.

AH173-PG-B-A Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 3-SIP

Packaging:: Bulk

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-B-A FAQ

1.How can I place an order for AH173-PG-B-A through Aetrix?

Please submit a Request for Quotation (RFQ) for AH173-PG-B-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-B-A reliable?

The price and inventory of AH173-PG-B-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-B-A is usually 5 days.

3.What payment methods are accepted for AH173-PG-B-A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH173-PG-B-A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH173-PG-B-A?

AH173-PG-B-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AH173-PG-B-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-B-A?

For technical support, including AH173-PG-B-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH173-PG-B-A requirements.

6.How does Aetrix verify that AH173-PG-B-A is sourced from the original manufacturer or authorized distributors?

All AH173-PG-B-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-B-A meets industry standards.

7.What is the process for return or replacement of AH173-PG-B-A?

All AH173-PG-B-A units undergo pre-shipment inspection (PSI). If there is an issue with AH173-PG-B-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-B-A part is unused and in its original packaging.

Return procedure for AH173-PG-B-A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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