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Diodes Incorporated AH175-WL-7-B
- Part No.:
- AH175-WL-7-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH175-WL-7-B.pdf
- Description:
- MAGNETIC SWITCH LATCH SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,418
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Product details
Overview
AH175-WL-7-B from Diodes Incorporated is a bipolar Hall-effect latch sensor designed for high-temperature rotor position and RPM sensing in brushless DC motor control. 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 SC59 (SOT23) package.
For engineers reviewing the AH175 datasheet, AH175 pinout, AH175 application, or AH175 equivalent, this page provides verified magnetic thresholds (Bop: 15–60 Gauss, Brp: −60 to −15 Gauss), thermal derating curves, SIP-3/SC59 package compatibility, and direct replacement guidance versus AH3724 for new designs.
Technical Context
The AH175 integrates a Hall voltage generator, amplifier, comparator with built-in hysteresis (30–120 Gauss), and open-collector pre-driver - enabling robust magnetic switching in noisy automotive and industrial environments. Its internal band-gap regulator ensures stable internal biasing across 3.5–20V supply and full temperature range.
It functions as a digital latching switch: output pulls low when South-pole flux exceeds Bop, remains latched until reverse polarity drops below Brp. This bipolar latching behavior eliminates need for external Schmitt triggers or polarity reversal circuitry in three-phase BLDC commutation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.5V to 20V DC - supports direct connection to 12V automotive rails without external regulation |
| Output Type | Open-collector pre-driver - interfaces directly with NPN/PNP drivers or logic-level MOSFET gates |
| Sink Current | 25mA max - drives standard optocouplers or small-signal transistors without buffering |
| Operating Temp | −40°C to +150°C - qualified for under-hood automotive and industrial motor control environments |
| Magnetic Hysteresis | 30–120 Gauss - suppresses false triggering from vibration-induced field fluctuations |
| Output Saturation | 300mV @ 10mA - ensures reliable low-state recognition by 3.3V/5V logic inputs |
| Power Dissipation | 230mW @ 25°C (SC59) - derates linearly to 0mW at 150°C; requires PCB copper area per Diodes' pad layout |
Pinout & Package
Package: SC59 (commonly known as SOT23 in Asia), 3-pin surface-mount, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc | Positive power supply input | Accepts 3.5–20V; powers internal regulator, amplifier, and comparator |
| GND | Ground reference | Common return path for supply and output current; must be low-impedance |
| OUT | Open-collector digital output | Sinks up to 25mA; requires external pull-up to define logic-high level |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latching operation | Eliminates need for external polarity detection; enables precise commutation timing in 3-phase BLDC motors |
| Integrated band-gap regulator | Provides temperature-compensated internal biasing - maintains consistent Bop/Brp over −40°C to +150°C |
| Built-in reverse-polarity protection | Withstands −20V supply misconnection - prevents damage during assembly or field service |
| High ESD immunity | ±4kV HBM - reduces risk of latch-up or parametric shift during handling and reflow |
| Green, halogen-free construction | <900ppm Br, <900ppm Cl, <1000ppm Sb - meets global environmental compliance mandates without performance trade-offs |
Applications
| Brushless DC Motor Commutation | Rotor Position Sensing |
|---|---|
Use Scenario: Detecting magnetic pole transitions on rotating shafts in HVAC blowers and power tools. IC Role / Device Role / Timing Role: Digital latching Hall sensor providing edge-triggered phase signals to motor driver ICs. Use Value: Enables precise 120° electrical commutation with <1µs propagation delay and no external hysteresis components. |
Use Scenario: Monitoring crankshaft or camshaft angular position in engine management systems. IC Role / Device Role / Timing Role: High-temperature magnetic switch generating synchronized timing pulses for ignition/fuel injection control. Use Value: Maintains stable Bop/Brp thresholds across −40°C cold start to +150°C under-hood operation. |
| Current Switch Interface | RPM Detection |
Use Scenario: Converting current transformer secondary output into clean digital enable/disable signal for load relays. IC Role / Device Role / Timing Role: Magnetic threshold detector isolating high-side current sensing from control logic. Use Value: Open-collector output sinks 25mA directly into relay coil or optocoupler LED - no buffer transistor required. |
Use Scenario: Measuring rotational speed of gear teeth or fan blades via magnetic target passing. IC Role / Device Role / Timing Role: Pulse-generating Hall latch converting analog field changes into TTL-compatible frequency output. Use Value: 80 Gauss typical hysteresis prevents double-counting from mechanical vibration or target wobble. |
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), SC59/SIP-3 compatible | Supports battery-powered devices and tighter magnetic air gaps; recommended for all new designs per Diodes notice | Select AH3724 when designing for low-voltage systems or requiring enhanced noise immunity and longer lifecycle support |
| US1751 | Same pinout and function, but rated only to +125°C; lacks AEC-Q100 qualification documentation; lower hysteresis (20–80 Gauss) | Not suitable for under-hood automotive use; limited thermal margin in high-power motor enclosures | Consider US1751 only for cost-sensitive industrial controls where ambient stays below 125°C and AEC-Q100 is not mandated |
Compared with AH175-WL-7-B, AH3724 offers broader voltage range and superior ESD robustness for next-gen designs, while US1751 provides functional equivalence at reduced thermal capability - making AH175 appropriate only for legacy replacements within its documented +150°C envelope.
Availability
AH175-WL-7-B 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 in high-temperature industrial and automotive contexts.
Supply support for AH175-WL-7-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The AH175 belongs to Diodes' Hall-effect sensor product line, engineered specifically for high-reliability magnetic position feedback in harsh-temperature motor control and automotive subsystems.
FAQ
What is the magnetic polarity requirement for AH175-WL-7-B operation?
The AH175 activates on South-pole magnetic flux applied to the branded side of the package. When flux density exceeds Bop (15–60 Gauss), OUT pulls low; it remains latched until reverse (North-pole) flux falls below Brp (−60 to −15 Gauss). The device does not respond to North-pole-only actuation.
Can AH175-WL-7-B drive an LED directly?
Yes - with a 4.7kΩ pull-up to 5V, the AH175 can sink 1–2mA to illuminate a standard indicator LED. For higher-current LEDs (e.g., 10–20mA), use the 25mA sink capability with appropriate series resistance and verify VOUT(SAT) ≤ 400mV at the target current per datasheet conditions.
Is AH175-WL-7-B qualified to AEC-Q100?
No - the AH175 is not AEC-Q100 qualified. Diodes explicitly states that for automotive applications requiring AEC-Q100/101/200 qualification, PPAP capability, or IATF 16949 manufacturing, users must contact Diodes or their local representative for qualified alternatives such as AH3724.
Why does AH175-WL-7-B have different power dissipation ratings for SIP-3 vs. SC59 packages?
SC59 (SOT23) has smaller thermal mass and less PCB copper area for heat spreading than SIP-3, resulting in lower absolute power handling: 230mW at 25°C vs. 550mW for SIP-3. Derating curves show SC59 reaches 0mW at 150°C, matching its junction temperature limit and package thermal resistance (RθJA ≈ 543°C/W).
AH175-WL-7-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Latch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 8mT Trip, -8mT 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:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH175-WL-7-B FAQ
1.How can I place an order for AH175-WL-7-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH175-WL-7-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 AH175-WL-7-B reliable?
The price and inventory of AH175-WL-7-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH175-WL-7-B is usually 5 days.
3.What payment methods are accepted for AH175-WL-7-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH175-WL-7-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH175-WL-7-B?
AH175-WL-7-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH175-WL-7-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 AH175-WL-7-B?
For technical support, including AH175-WL-7-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH175-WL-7-B requirements.
6.How does Aetrix verify that AH175-WL-7-B is sourced from the original manufacturer or authorized distributors?
All AH175-WL-7-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 AH175-WL-7-B meets industry standards.
7.What is the process for return or replacement of AH175-WL-7-B?
All AH175-WL-7-B units undergo pre-shipment inspection (PSI). If there is an issue with AH175-WL-7-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 AH175-WL-7-B part is unused and in its original packaging.
Return procedure for AH175-WL-7-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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