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Diodes Incorporated AH175-PL-B-A
- Part No.:
- AH175-PL-B-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH175-PL-B-A.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,628
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Product details
Overview
AH175-PL-B-A from Diodes Incorporated is a bipolar Hall-effect latch sensor designed for high-temperature rotor position and RPM sensing in brushless DC motors. It operates from 3.5V to 20V, delivers 25mA sink current, features open-collector output with 300mV saturation voltage at 10mA, and supports -40°C to +150°C ambient operation in SIP-3 and SC59 packages.
For engineers reviewing the AH175-PL-B-A datasheet, AH175-PL-B-A pinout, AH175-PL-B-A application, or AH175-PL-B-A equivalent, key selection criteria include magnetic operate/release points (Bop/Brp), thermal derating curves, reverse-polarity protection, and compatibility with three-phase Hall motor commutation logic under extended temperature stress.
Technical Context
The AH175 integrates a Hall voltage generator, amplifier, comparator with built-in hysteresis (30–120 Gauss), and open-collector pre-driver stage - enabling robust magnetic switching in noisy industrial environments. Its internal band-gap regulator ensures stable internal biasing across the full 3.5–20V supply range.
It functions as a digital magnetic threshold detector: output pulls low when B > Bop (e.g., 15–60 Gauss for Grade A), remains latched until B reverses and falls below Brp (e.g., –60 to –15 Gauss), providing immunity to field fluctuations during motor rotation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.5V to 20V DC - enables direct connection to 12V automotive or 24V industrial rails without external regulation |
| Output Sink Current | 25mA - drives standard optocouplers or logic-level MOSFET gates without external buffer |
| Operating Temperature | –40°C to +150°C - qualified for under-hood automotive and high-temp industrial motor control |
| Magnetic Hysteresis | 30–120 Gauss - prevents chatter during slow or noisy magnetic transitions near trip thresholds |
| Output Saturation | 300mV max at 10mA - ensures reliable low-state logic recognition with margin over TTL/CMOS input thresholds |
| Power Dissipation | 550mW (SIP-3), 230mW (SC59) at 25°C - defines maximum continuous power before thermal shutdown in respective packages |
Pinout & Package
Available in SIP-3 (Bulk Pack) and SC59 (SOT23-equivalent) packages. SIP-3 uses straight leads; SC59 is surface-mount with gull-wing terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc (Pin 1) | Positive supply input | Accepts 3.5–20V; powers internal regulator, amplifier, and comparator stages |
| GND (Pin 2) | Reference ground | Return path for supply current and output sink current; requires low-impedance PCB connection |
| OUT (Pin 3) | Open-collector digital output | Sinks up to 25mA; requires external pull-up resistor to define logic-high level and voltage rail |
Key Features
| Feature | Design Value |
|---|---|
| Built-in reverse polarity protection | Withstands accidental Vcc/GND reversal up to 20V without damage or latch-up |
| Temperature-compensated band-gap regulator | Maintains stable internal bias across –40°C to +150°C, minimizing Bop/Brp drift |
| High hysteresis magnetic window | 30–120 Gauss separation between operate and release points rejects mechanical vibration noise |
| Lead-free & halogen-free construction | Complies with RoHS 3 (2015/863/EU) and Diodes' "Green" definition (<900ppm Br/Cl, <1000ppm Sb) |
Applications
| Brushless DC Motor Commutation | Rotor Position Sensing |
|---|---|
Use Scenario: Detecting magnetic pole transitions on rotating rotors to sequence phase currents in 3-phase BLDC drives. IC Role / Device Role / Timing Role: Digital magnetic latch providing synchronized edge-triggered signals to motor driver logic. Use Value: Enables precise 120° electrical commutation timing with ±5° angular accuracy over full temperature range. | Use Scenario: Monitoring shaft angular position in HVAC blower motors and industrial fans. IC Role / Device Role / Timing Role: Bipolar latch generating deterministic ON/OFF states per magnet pole passage. Use Value: Delivers repeatable position detection with <1μs propagation delay variation across –40°C to +150°C. |
| Current Switch Interface | RPM Detection |
Use Scenario: Converting magnetic actuation (e.g., reed switch replacement) into solid-state current switching for solenoid or relay control. IC Role / Device Role / Timing Role: High-current open-collector output directly driving 25mA loads without external transistor. Use Value: Eliminates discrete BJT/MOSFET interface, reducing BOM count and PCB area by 30%. | Use Scenario: Measuring rotational speed of gear teeth or encoder wheels in pump and compressor systems. IC Role / Device Role / Timing Role: Magnetic pulse generator feeding frequency-to-voltage converter or microcontroller timer input. Use Value: Supports RPM measurement up to 30,000 RPM with jitter <±200ns due to fast hysteresis response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3724 | Higher sensitivity (Bop: 5–35 Gauss), lower VCC min (2.5V), integrated ESD protection (±8kV HBM) | Optimized for battery-powered devices and tighter magnetic gaps; not rated for >125°C junction | Select for new designs requiring wider magnetic margin or lower supply voltage; AH175 remains valid for legacy 150°C ambient use. |
| US1881 | Unipolar operation (Bop only, no Brp), 30mA sink, same SIP-3/SC59 footprint | Lacks latching behavior - resets when field drops; unsuitable for position-hold or commutation | Use only where momentary detection suffices; avoid for BLDC commutation or RPM counting requiring state retention. |
Compared with AH3724 and US1881, AH175-PL-B-A uniquely maintains full 150°C ambient operation with bipolar latching and reverse-polarity protection - making it the sole choice for high-temp industrial motor feedback where thermal stability and magnetic memory are non-negotiable.
Availability
AH175-PL-B-A is available at Aetrix Electronics and suitable for brushless DC motor commutation, rotor position sensing, current switch interfaces, and RPM detection requiring stable component supply across extended temperature ranges.
Supply support for AH175-PL-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 components for automotive, industrial, and computing markets.
The AH175 belongs to Diodes' Hall-effect sensor product line, engineered specifically for high-temperature magnetic position feedback in demanding motor control and safety-critical motion systems.
FAQ
What is the magnetic polarity requirement for AH175-PL-B-A operation?
The AH175-PL-B-A is a bipolar latch: it turns ON when a south pole approaches the branded side (B > Bop), and remains ON until a south pole of sufficient reverse strength (B < Brp) is applied. North pole exposure alone does not trigger switching - polarity reversal is required for state change.
Can AH175-PL-B-A be used without an external pull-up resistor?
No. The AH175-PL-B-A has an open-collector output and requires an external pull-up resistor to define the logic-high voltage level. Typical values range from 2.2kΩ to 10kΩ, selected based on rise time requirements and supply voltage (e.g., 4.7kΩ for 5V, 10kΩ for 12V).
Is AH175-PL-B-A qualified to AEC-Q100?
No. While AH175-PL-B-A operates from –40°C to +150°C and is manufactured in IATF 16949-certified facilities, it is not formally AEC-Q100 qualified. For automotive applications requiring AEC-Q100 compliance, Diodes recommends contacting their sales team for qualified alternatives such as the AH3724-Q.
How does thermal derating affect AH175-PL-B-A power dissipation in SIP-3 package?
In SIP-3 (Bulk Pack), the AH175-PL-B-A's power dissipation linearly derates from 550mW at 25°C to 0mW at 150°C. At 100°C ambient, maximum allowable dissipation is 220mW - limiting continuous output current to ~18mA at 12V supply to stay within safe SOA limits.
AH175-PL-B-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Function:
- Latch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 6mT Trip, -6mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 3.5V ~ 20V
- Current - Supply (Max):
- 6mA
- Current - Output (Max):
- 25mA
- Output Type:
- Open Collector
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH175-PL-B-A FAQ
1.How can I place an order for AH175-PL-B-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH175-PL-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 AH175-PL-B-A reliable?
The price and inventory of AH175-PL-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 AH175-PL-B-A is usually 5 days.
3.What payment methods are accepted for AH175-PL-B-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH175-PL-B-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH175-PL-B-A?
AH175-PL-B-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH175-PL-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 AH175-PL-B-A?
For technical support, including AH175-PL-B-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH175-PL-B-A requirements.
6.How does Aetrix verify that AH175-PL-B-A is sourced from the original manufacturer or authorized distributors?
All AH175-PL-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 AH175-PL-B-A meets industry standards.
7.What is the process for return or replacement of AH175-PL-B-A?
All AH175-PL-B-A units undergo pre-shipment inspection (PSI). If there is an issue with AH175-PL-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 AH175-PL-B-A part is unused and in its original packaging.
Return procedure for AH175-PL-B-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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