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Diodes Incorporated AH173-PL-B-B
- Part No.:
- AH173-PL-B-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH173-PL-B-B.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,932
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Product details
Overview
AH173-PL-B-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 supports –40°C to +125°C ambient operation in SIP-3 (Bulk Pack) package.
For engineers reviewing the AH173-PL-B-B datasheet, AH173-PL-B-B pinout, AH173-PL-B-B application, or AH173-PL-B-B equivalent, this page provides verified technical context, validated pin functions, real-world use cases in motor commutation, and confirmed drop-in alternatives for legacy design support.
Technical Context
The AH173 implements a bipolar latching architecture: output switches low when south-pole flux exceeds Bop (15–60 G), remains latched until reverse polarity drops below Brp (–60 to –15 G), providing inherent noise immunity via 80 G hysteresis. Its internal bandgap regulator enables stable operation across 3–20 V supply and full temperature range.
All signal conditioning-Hall voltage generation, amplification, comparator decision logic, and open-drain output stage with 7–13 kΩ internal pullup-is monolithically integrated. No external components are required for basic latch functionality, simplifying PCB layout in space-constrained motor control modules.
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 bus without external regulation. |
| Output Sink Current | 25 mA - drives standard logic inputs or small-signal MOSFET gates without external buffer. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial motor environments. |
| Magnetic Hysteresis | 80 Gauss - prevents chatter during slow or noisy magnetic transitions in rotating systems. |
| Internal Pullup Resistor | 7–13 kΩ - eliminates need for external pullup, reducing BOM count and board area. |
| Output Saturation Voltage | ≤400 mV at 10 mA - ensures clean TTL/CMOS-compatible low-state even under load. |
| Supply Current (Off) | 3.5–6 mA - enables low-quiescent-power operation in always-on sensing nodes. |
Pinout & Package
AH173-PL-B-B is supplied in SIP-3 (Bulk Pack) package: 3-pin single-inline package with straight leads, 14.0–15.0 mm body length, 2.8–3.2 mm width, and 3.9–4.3 mm height. Pin 1 = Vcc, Pin 2 = GND, Pin 3 = OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vcc | Positive power supply input | Accepts 3–20 V DC; powers internal regulator, amplifier, and output driver. |
| 2 - GND | Ground reference | Common return path for supply and output current; must be low-impedance for noise immunity. |
| 3 - OUT | Open-drain digital output | Sinks up to 25 mA when active; pulled high internally (7–13 kΩ) to Vcc when inactive. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latching operation | Retains state after magnetic trigger-enables reliable commutation timing without continuous field presence. |
| Integrated 7–13 kΩ pullup | Eliminates external resistor, reducing component count and layout complexity in motor control PCBs. |
| Wide 3–20 V supply range | Direct compatibility with 5 V, 12 V, and 24 V systems-no level-shifting or LDO needed. |
| –40°C to +125°C operation | Validated performance across full automotive under-hood thermal envelope without derating. |
| 80 Gauss magnetic hysteresis | Rejects EMI and mechanical vibration-induced false triggers in high-noise motor environments. |
Applications
| BLDC Motor Commutation | Rotor Position Sensing |
|---|---|
Use Scenario: Detecting rotor pole 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. Use Value: Enables precise 120° electrical phase alignment with <±1° angular error due to tight Bop/Brp matching and 80 G hysteresis. |
Use Scenario: Monitoring rotational position of gear teeth or magnetized shafts in industrial actuators. IC Role / Device Role / Timing Role: Bipolar latch generating clean, debounced position pulses independent of rotation speed. Use Value: Delivers consistent switching over 0–20,000 RPM range with no minimum speed limitation due to DC-coupled Hall sensing. |
| Current Switch Interface | RPM Detection |
Use Scenario: Converting magnetic actuation (e.g., reed switch replacement) into solid-state current-switch control signals. IC Role / Device Role / Timing Role: High-immunity digital switch replacing electromechanical contacts in safety-critical circuits. Use Value: 25 mA sink capability directly drives small relays or optocouplers; eliminates contact wear and bounce. |
Use Scenario: Measuring rotational speed in fans, pumps, and conveyor systems via pulse counting. IC Role / Device Role / Timing Role: Edge-triggered tachometer input with built-in noise rejection for accurate frequency measurement. Use Value: 80 G hysteresis ensures stable pulse generation even with air-gap variation or EMI, improving RPM accuracy by >99.5% vs. non-latching sensors. |
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 ICC (2.5 mA typ), SC59/SIP-3 packaging | Optimized for low-power battery-operated encoders; requires external pullup in SC59 variant | Preferred for new designs requiring lower quiescent current and tighter magnetic thresholds. |
| AH3724A | Wider hysteresis (120 G), extended temperature range (–40°C to +150°C), same package options | Better suited for extreme-temperature engine control units where thermal drift compensation is critical | Select when operating above +125°C ambient or where enhanced noise margin beyond 80 G is required. |
Compared with AH173-PL-B-B, AH3722A reduces system power by ~30% and improves magnetic resolution, while AH3724A extends thermal robustness and noise immunity-both eliminate obsolescence risk and offer pin-compatible SIP-3/SC59 footprints.
Availability
AH173-PL-B-B is available at Aetrix Electronics and suitable for BLDC motor commutation, rotor position sensing, current switch interfaces, and RPM detection requiring stable component supply despite NRND status.
Supply support for AH173-PL-B-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 and industrial markets.
AH173 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, cost-effective magnetic position feedback in motor control and motion systems operating under harsh thermal and EMI conditions.
FAQ
Is AH173-PL-B-B RoHS compliant and lead-free?
Yes. AH173-PL-B-B is fully RoHS 3 compliant (2015/863/EU), totally lead-free, halogen-free (<900 ppm Br/Cl, <1000 ppm Sb), and certified "Green" per Diodes' specifications. Marking code "G" in the part number confirms compliance.
What is the difference between SIP-3 (Ammo Pack) and SIP-3 (Bulk Pack) variants?
SIP-3 (Bulk Pack) uses straight leads (J-column ordering suffix "B"), optimized for through-hole wave soldering. SIP-3 (Ammo Pack) uses spread leads (suffix "A") for tape-and-reel automated placement. Both share identical die, electrical specs, and thermal ratings.
Can AH173-PL-B-B replace reed switches in high-cycle applications?
Yes. With no moving parts and 25 mA sink capability, AH173-PL-B-B supports >100 million operations-far exceeding typical reed switch lifetime. Its solid-state construction eliminates contact bounce, arcing, and sensitivity to shock/vibration.
Why is AH173 marked NRND, and what does that mean for existing designs?
NRND ("Not Recommended for New Designs") indicates Diodes has superseded AH173 with AH3722A/AH3724A. However, AH173-PL-B-B remains fully manufactured and supported for legacy production; Aetrix guarantees continuity supply and full traceability for ongoing builds.
AH173-PL-B-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Latch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 8mT Trip, -8mT 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-B-B FAQ
1.How can I place an order for AH173-PL-B-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH173-PL-B-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-B-B reliable?
The price and inventory of AH173-PL-B-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-B-B is usually 5 days.
3.What payment methods are accepted for AH173-PL-B-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH173-PL-B-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH173-PL-B-B?
AH173-PL-B-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH173-PL-B-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-B-B?
For technical support, including AH173-PL-B-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH173-PL-B-B requirements.
6.How does Aetrix verify that AH173-PL-B-B is sourced from the original manufacturer or authorized distributors?
All AH173-PL-B-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-B-B meets industry standards.
7.What is the process for return or replacement of AH173-PL-B-B?
All AH173-PL-B-B units undergo pre-shipment inspection (PSI). If there is an issue with AH173-PL-B-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-B-B part is unused and in its original packaging.
Return procedure for AH173-PL-B-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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