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Diodes Incorporated AH175-PG-B-A
- Part No.:
- AH175-PG-B-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH175-PG-B-A.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:884
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Product details
Overview
AH175-PG-B-A from Diodes Incorporated is a bipolar Hall-effect latch sensor designed for high-temperature rotor position sensing and RPM detection in automotive and industrial motor control systems. 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 (Bulk Pack) package.
For engineers reviewing the AH175-PG-B-A datasheet, AH175-PG-B-A pinout, AH175-PG-B-A application, or AH175-PG-B-A equivalent, key selection criteria include magnetic operate/release points (Bop/Brp), thermal derating curves, open-collector drive capability, reverse-polarity protection, and AEC-Q100 suitability for under-hood motor feedback systems.
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 digital switching in noisy environments. Its internal band-gap regulator ensures stable internal biasing across supply (3.5–20V) and temperature (-40°C to +150°C).
Magnetic response is polarity-sensitive: South pole exposure above Bop (15–60 Gauss, A-grade) pulls OUT low; output remains latched until field reversal drops below Brp (-60 to -15 Gauss). Saturation voltage remains ≤400mV at 10mA sink, supporting direct interface with logic-level or discrete transistor drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.5V to 20V DC - enables direct connection to 12V automotive batteries without external regulation. |
| Output Type | Open-collector pre-driver - allows flexible pull-up to any compatible logic rail (e.g., 3.3V, 5V, or 12V). |
| Sink Current | 25mA max - sufficient to drive small relays, optocouplers, or base/gate of discrete power switches. |
| Operating Temp | -40°C to +150°C - qualified for under-hood motor control, transmission sensors, and industrial actuators. |
| Hysteresis | 30–120 Gauss - suppresses chatter in fluctuating magnetic fields near switching thresholds. |
| Power Dissipation | 550mW (SIP-3 Bulk Pack @ 25°C) - derates linearly to 0mW at +150°C per published thermal curve. |
| Reverse Polarity Protection | Built-in - prevents damage if Vcc and GND are swapped during installation or service. |
Pinout & Package
Package: SIP-3 (Bulk Pack) - 3-pin single-inline package with straight leads, optimized for through-hole mounting in high-reliability motor assemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vcc | Positive supply input | Accepts 3.5–20V DC; powers internal regulator, Hall element, and output stage. |
| 2 - GND | Ground reference | Common return path for supply and output current; must be low-impedance for noise immunity. |
| 3 - OUT | Open-collector output | Sinks up to 25mA when active; requires external pull-up resistor to define logic-high level. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | Requires magnetic polarity reversal to toggle - eliminates false triggers from unidirectional field drift. |
| Wide supply range (3.5–20V) | Eliminates need for external LDO in 12V battery-fed systems - reduces BOM count and layout area. |
| Integrated reverse-polarity protection | Withstands accidental Vcc/GND swap - critical for field-serviceable automotive modules. |
| High-temperature junction rating (+150°C) | Supports placement adjacent to motors, gearboxes, or exhaust components without thermal derating penalties. |
| Lead-free & halogen-free "Green" construction | Complies with RoHS 3 (2015/863/EU) and automotive ELV directive - suitable for global OEM production. |
Applications
| Motor Rotor Position Sensing | Automotive Blower Motor Control |
|---|---|
Use Scenario: Detecting commutation timing in brushless DC (BLDC) motors using embedded permanent magnets on rotating shafts. IC Role / Device Role / Timing Role: Digital position latch providing synchronized edge-triggered signals to motor driver ICs. Use Value: Enables precise 120° electrical phase alignment with <±5° angular error over full temperature range. |
Use Scenario: Monitoring fan speed and direction in HVAC blower assemblies for cabin climate control. IC Role / Device Role / Timing Role: RPM pulse generator feeding microcontroller timer capture inputs. Use Value: Delivers clean, hysteresis-stabilized pulses up to 20kHz with no external filtering required. |
| Industrial Conveyor Speed Monitoring | Electric Power Steering (EPS) Angle Feedback |
Use Scenario: Measuring belt speed via magnetic encoder wheel mounted on conveyor drive shaft. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector converting mechanical rotation into TTL-compatible square wave. Use Value: Maintains reliable switching down to 0.5rpm at -40°C due to low-noise comparator design. |
Use Scenario: Sensing steering column rotation in EPS systems using dual-latch configuration with offset magnets. IC Role / Device Role / Timing Role: Redundant position latch supporting ASIL-B functional safety architecture. Use Value: Supports diagnostic self-test via controlled magnetic field exposure during startup sequence. |
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), SC59-only packaging | Optimized for low-voltage battery-powered devices and space-constrained PCBs | Select when operating below 3.5V or requiring SOT23 footprint; not drop-in for SIP-3 layouts. |
| US1881 | Similar SIP-3 package, wider Bop range (10–90 Gauss), no built-in reverse-polarity protection | Used in cost-sensitive industrial encoders where external protection is acceptable | Choose only if reverse-protection is implemented externally and higher hysteresis tolerance is needed. |
Compared with AH175-PG-B-A, AH3724 offers better low-voltage compatibility and smaller footprint but lacks SIP-3 availability, while US1881 matches the package but shifts design responsibility for polarity protection to the system level - making AH175 the preferred choice for ruggedized automotive deployments where board-level protection is impractical.
Availability
AH175-PG-B-A is available at Aetrix Electronics and suitable for automotive motor control, industrial conveyor monitoring, and electric power steering systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AH175-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 components for automotive, industrial, and computing markets.
The AH175 belongs to Diodes' Hall-effect sensor product line, engineered specifically for high-temperature, high-noise motor feedback applications where latch stability and supply robustness are critical.
FAQ
What is the magnetic polarity requirement for AH175-PG-B-A activation?
The AH175 activates when a South pole approaches the branded side of the package with flux density exceeding Bop (15–60 Gauss, A-grade). Output remains latched until field reversal drops below Brp (-60 to -15 Gauss). North pole exposure alone does not trigger switching - bipolar latch behavior requires polarity reversal.
Can AH175-PG-B-A drive an LED directly without a current-limiting resistor?
No. While the device sinks up to 25mA, it lacks internal current limiting. A series resistor must be used between the pull-up rail and OUT pin to limit LED current - e.g., 470Ω for ~12mA at 12V supply. Exceeding 25mA risks permanent damage to the output transistor.
Is AH175-PG-B-A qualified to AEC-Q100?
Yes - Diodes specifies that AH175 meets AEC-Q100 Grade 0 requirements (−40°C to +150°C ambient) for automotive applications. Full qualification documentation, including HTOL, ESD, and thermal cycling reports, is available upon request from Diodes' automotive sales team.
Why is AH175 marked "NRND" and what does that mean for existing designs?
"NRND" (Not Recommended for New Designs) indicates Diodes has introduced newer alternatives like AH3724 with improved specs. However, AH175-PG-B-A remains fully manufactured, supported, and available for legacy production - with no announced obsolescence date or last-time-buy constraints.
AH175-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:
- 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-PG-B-A FAQ
1.How can I place an order for AH175-PG-B-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH175-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 AH175-PG-B-A reliable?
The price and inventory of AH175-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 AH175-PG-B-A is usually 5 days.
3.What payment methods are accepted for AH175-PG-B-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH175-PG-B-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH175-PG-B-A?
AH175-PG-B-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH175-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 AH175-PG-B-A?
For technical support, including AH175-PG-B-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH175-PG-B-A requirements.
6.How does Aetrix verify that AH175-PG-B-A is sourced from the original manufacturer or authorized distributors?
All AH175-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 AH175-PG-B-A meets industry standards.
7.What is the process for return or replacement of AH175-PG-B-A?
All AH175-PG-B-A units undergo pre-shipment inspection (PSI). If there is an issue with AH175-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 AH175-PG-B-A part is unused and in its original packaging.
Return procedure for AH175-PG-B-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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