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Diodes Incorporated AH175-WG-7-B
- Part No.:
- AH175-WG-7-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH175-WG-7-B.pdf
- Description:
- MAGNETIC SWITCH LATCH SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,990
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Product details
Overview
AH175-WG-7-B from Diodes Incorporated is a bipolar Hall-effect latch sensor designed for high-temperature rotor position sensing and RPM detection in brushless DC motors. It operates from 3.5V to 20V, delivers 25mA sink current, features open-collector output, and supports ambient temperatures from −40°C to +150°C in SC59 (SOT23) package.
For engineers reviewing the AH175-WG-7-B datasheet, AH175-WG-7-B pinout, AH175-WG-7-B application, or AH175-WG-7-B equivalent, key selection criteria include magnetic operate/release points (Bop/Brp), thermal derating curves for SC59, reverse-polarity protection, and compatibility with three-phase Hall motor commutation logic.
Technical Context
The AH175 integrates a Hall voltage generator, amplifier, comparator with built-in hysteresis (≥30 Gauss), and open-collector pre-driver stage. Its internal band-gap regulator enables stable operation across 3.5–20V supply while compensating for temperature drift in magnetic thresholds.
It functions as a digital latch: output switches low when south-pole flux exceeds Bop (e.g., 15–60 Gauss for Grade A), remains latched until flux reverses and falls below Brp (e.g., −60 to −15 Gauss), ensuring noise-immune edge detection in rotating machinery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.5V to 20V DC - supports direct connection to automotive battery rails without external regulation |
| Output Sink Current | 25mA - drives standard logic-level inputs or small-signal MOSFET gates directly |
| Operating Temperature | −40°C to +150°C - qualified for under-hood motor control and industrial encoder environments |
| Magnetic Hysteresis | 30–120 Gauss - prevents chatter during slow or noisy magnetic transitions |
| Output Saturation Voltage | ≤400mV at 10mA - ensures clean logic-low level compatible with 3.3V/5V CMOS inputs |
| Power Dissipation (SC59) | 230mW at 25°C, derates to 0mW at 150°C - requires thermal-aware PCB layout per Diodes' SOT23 pad recommendations |
Pinout & Package
AH175-WG-7-B is packaged in SC59 (industry-standard SOT23 footprint), with 3-pin surface-mount configuration optimized for automated assembly and high-density motor control PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc (Pin 1) | Positive power supply input | Accepts 3.5–20V; powers internal regulator, amplifier, and comparator stages |
| GND (Pin 2) | Ground reference | Common return path for supply and output current; must be low-impedance for noise immunity |
| OUT (Pin 3) | Open-collector digital output | Sinks up to 25mA; requires external pull-up resistor to define logic-high level and voltage domain |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar Latching Logic | Retains output state between magnetic transitions - eliminates need for external memory or microcontroller polling in position tracking |
| Integrated Reverse-Polarity Protection | Withstands −20V supply reversal - protects against accidental battery misconnection in automotive and industrial wiring |
| Temperature-Compensated Thresholds | Bop/Brp stability over −40°C to +150°C - maintains consistent switching points without calibration across thermal cycles |
| Lead-Free & Halogen-Free Construction | Meets RoHS 2 (2011/65/EU) and Diodes' "Green" definition (<900ppm Br/Cl, <1000ppm Sb) - compliant for global industrial and automotive shipments |
Applications
| Brushless DC Motor Commutation | Automotive Throttle Position Sensing |
|---|---|
Use Scenario: Detecting rotor magnet polarity in 3-phase BLDC motors for electronic commutation timing. 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 ±15 Gauss hysteresis margin against EMI-induced false triggering. |
Use Scenario: Monitoring throttle plate angular position via embedded magnet in pedal linkage. IC Role / Device Role / Timing Role: Latched magnetic switch generating fail-safe on/off status for engine control unit (ECU) safety monitoring. Use Value: −40°C to +150°C operation ensures reliability in under-hood environments without external heating or cooling. |
| Industrial Encoder Feedback | High-Temperature Fan Speed Detection |
Use Scenario: Counting gear teeth or slotted disk rotations in CNC machine tool encoders. IC Role / Device Role / Timing Role: Edge-detecting latch converting mechanical rotation into deterministic digital pulses. Use Value: 25mA sink capability drives long traces or multiple gate inputs without buffering; SC59 footprint saves board space in compact modules. |
Use Scenario: Monitoring fan RPM in server power supplies or industrial HVAC systems exposed to elevated ambient heat. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector feeding tachometer input of PMIC or microcontroller. Use Value: Derated power dissipation curve (230mW → 0mW from 25°C → 150°C) allows accurate thermal margining in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Diodes AH3774 | Higher sensitivity (Bop: 3–12 mT), integrated Schmitt trigger, 3.3V–26V supply | Designed for low-field detection in proximity sensing; lacks reverse-polarity protection | Select AH3774 only when operating near weak magnets or requiring tighter threshold control; verify external protection circuitry needed |
| Allegro A1120EUA-T | Wider temperature range (−40°C to +150°C), 20mA sink, no reverse-voltage protection | Optimized for cost-sensitive consumer encoders; SC59 package but lower max sink current | Prefer A1120EUA-T for non-automotive applications where reverse-polarity risk is absent and 20mA drive suffices |
Compared with AH175-WG-7-B, AH3774 offers finer magnetic resolution but requires added protection circuitry, while A1120EUA-T reduces cost and size at the expense of drive strength and fault resilience-making AH175-WG-7-B optimal for thermally demanding, safety-critical motor control where robustness is prioritized.
Availability
AH175-WG-7-B is available at Aetrix Electronics and suitable for brushless DC motor commutation, automotive throttle position sensing, industrial encoder feedback, and high-temperature fan speed detection requiring stable component supply across extended thermal and voltage ranges.
Supply support for AH175-WG-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, 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, latch-mode magnetic position detection in motor control and safety-critical motion systems.
FAQ
What is the magnetic polarity requirement for AH175-WG-7-B activation?
AH175-WG-7-B activates when a south pole approaches the branded side of the package, with Bop ranging from 15–60 Gauss (Grade A). It releases only upon magnetic reversal to a south-pole field weaker than Brp (−60 to −15 Gauss). North-pole approach does not trigger switching - polarity-specific operation is inherent to its bipolar latch architecture.
Can AH175-WG-7-B operate without an external pull-up resistor?
No. The OUT pin is an open-collector output and requires an external pull-up resistor to define the logic-high voltage level and current limit. Typical values range from 1kΩ to 10kΩ depending on rise-time requirements and supply voltage; omission results in undefined or floating output states during the "off" condition.
Is AH175-WG-7-B suitable for new designs despite the "NRND" marking?
Yes - "NRND" applies only to legacy SIP-3 variants (AH175-PG-A-A/B, AH175-PG-B-A/B); AH175-WG-7-B (SC59, tape-and-reel) is actively supported, listed in Diodes' current portfolio, and qualified for new designs requiring SOT23-compatible Hall latches with reverse-polarity protection and 150°C operation.
How does thermal derating affect AH175-WG-7-B's maximum output current at 125°C?
At 125°C, the SC59 package's power dissipation limit drops to 110mW. With VOUT(SAT) ≤400mV at 10mA, sustained 25mA sinking would exceed thermal limits. For continuous operation at 125°C, output current must be limited to ≤20mA - verified using Diodes' SC59 derating curve (DS31043, page 4) and PCB copper area per recommended pad layout.
AH175-WG-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:
- Active
- Function:
- Latch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 6mT Trip, -6mT Release
- Test Condition:
- -40°C ~ 150°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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH175-WG-7-B FAQ
1.How can I place an order for AH175-WG-7-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH175-WG-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-WG-7-B reliable?
The price and inventory of AH175-WG-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-WG-7-B is usually 5 days.
3.What payment methods are accepted for AH175-WG-7-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH175-WG-7-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH175-WG-7-B?
AH175-WG-7-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH175-WG-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-WG-7-B?
For technical support, including AH175-WG-7-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH175-WG-7-B requirements.
6.How does Aetrix verify that AH175-WG-7-B is sourced from the original manufacturer or authorized distributors?
All AH175-WG-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-WG-7-B meets industry standards.
7.What is the process for return or replacement of AH175-WG-7-B?
All AH175-WG-7-B units undergo pre-shipment inspection (PSI). If there is an issue with AH175-WG-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-WG-7-B part is unused and in its original packaging.
Return procedure for AH175-WG-7-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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