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Diodes Incorporated AH173-WG-7-B
- Part No.:
- AH173-WG-7-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH173-WG-7-B.pdf
- Description:
- MAGNETIC SWITCH LATCH SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,970
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Product details
Overview
AH173-WG-7-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 functions reliably from −40°C to +125°C in SC59 (SOT23) package.
For engineers reviewing the AH173-WG-7-B datasheet, AH173-WG-7-B pinout, AH173-WG-7-B application in motor commutation, or AH173-WG-7-B equivalent for Hall-based position feedback, this page provides verified technical context, validated pin functions, real-world use cases, and confirmed alternatives aligned with automotive and industrial design constraints.
Technical Context
The AH173-WG-7-B implements a fully integrated Hall latch architecture: on-chip Hall generator, amplifier, comparator with built-in hysteresis (80 Gauss), and open-drain output stage with internal 7–13 kΩ pullup resistor. Its bandgap-regulated supply enables stable operation across 3–20 V and full temperature range.
Magnetic switching is polarity-sensitive: output pulls low when south pole flux exceeds Bop (15–60 G), remains latched until reversed field falls below Brp (−60 to −15 G). This bipolar latching behavior eliminates need for external Schmitt trigger or pullup components in encoder and current-switch applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3 V to 20 V DC - supports direct connection to 12 V automotive rails without external regulation |
| Output Sink Current | 25 mA - drives standard logic inputs or small MOSFET gates directly without buffer stage |
| Operating Temperature | −40°C to +125°C - qualified for under-hood and industrial motor control environments |
| Magnetic Hysteresis | 80 Gauss - ensures robust noise immunity in electrically noisy motor drive systems |
| Internal Pullup Resistor | 7–13 kΩ - eliminates external resistor, reducing BOM count and PCB footprint |
| Output Saturation Voltage | ≤400 mV at 10 mA - guarantees clean logic-low level for TTL/CMOS interface compatibility |
| Supply Current (Off) | 3.5–6 mA - enables low-quiescent-power operation in battery-backed or energy-conscious systems |
Pinout & Package
The AH173-WG-7-B is housed in SC59 package (commonly known as SOT23 in Asia), with 3-pin single-ended surface-mount configuration and standardized pad layout per Diodes' outline drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vcc (Pin 1) | Positive power supply input | Accepts 3–20 V DC; powers internal regulator, Hall element, and output driver |
| GND (Pin 2) | Ground reference | Return path for supply and output current; must be low-impedance for noise immunity |
| OUT (Pin 3) | Open-drain digital output | Sinks up to 25 mA when active; pulled high internally via Rpu; requires no external pullup |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latching operation | Enables position-sensing without external polarity reversal circuitry or dual-sensor setups |
| Integrated 7–13 kΩ pullup | Reduces component count and layout complexity in space-constrained motor control PCBs |
| Wide 3–20 V supply range | Eliminates need for dedicated LDO in 5 V, 12 V, or 24 V system domains |
| −40°C to +125°C operation | Validated for under-hood automotive and industrial motor drive thermal environments |
| 80 Gauss magnetic hysteresis | Prevents chatter during slow or noisy magnetic transitions in RPM and encoder applications |
Applications
| 3-Phase BLDC Motor Commutation | Rotor Position Sensing |
|---|---|
Use Scenario: Detecting rotor magnet polarity to sequence gate drive signals in brushless DC motor controllers. IC Role / Device Role / Timing Role: Digital Hall latch providing synchronized edge-triggered phase timing signals to motor driver IC. Use Value: Enables precise 120° electrical angle alignment with <±15 Gauss repeatability and 80 Gauss noise margin at 125°C ambient. |
Use Scenario: Monitoring angular position of rotating shafts in HVAC blowers and power tools. IC Role / Device Role / Timing Role: Bipolar magnetic latch delivering deterministic ON/OFF state per magnet pole passage. Use Value: Delivers consistent switching over full temperature range without calibration due to internal bandgap regulation. |
| Current Switch Feedback | RPM Detection |
Use Scenario: Indirect current monitoring via magnetic field from current-carrying conductor in overload protection circuits. IC Role / Device Role / Timing Role: Threshold-triggered latch detecting field strength above setpoint to activate shutdown logic. Use Value: Provides galvanically isolated, contactless current threshold detection with 25 mA sink capability for direct MCU interrupt assertion. |
Use Scenario: Measuring rotational speed of gears or fans using embedded magnets and fixed sensor placement. IC Role / Device Role / Timing Role: Pulse generator producing one logic transition per magnet pass for frequency-based speed calculation. Use Value: Delivers jitter-free pulse train with ≤400 mV saturation voltage, ensuring accurate counting even at low Vcc (3 V). |
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 max supply (18 V), SC59 package, AEC-Q100 Grade 0 qualified | Designed for automotive-grade motor control with PPAP support and IATF 16949 manufacturing | Preferred for new designs requiring AEC-Q100 qualification and tighter magnetic thresholds |
| AH3724A | Same package and qualification as AH3722A, but with extended Bop range (5–80 G) and higher hysteresis (100 G) | Optimized for variable-gap or low-field applications such as small-diameter encoders and precision RPM sensing | Select when wider magnetic operate window or enhanced noise immunity is required |
Compared with AH173-WG-7-B, both AH3722A and AH3724A offer AEC-Q100 qualification, tighter parametric distributions, and updated process technology-making them drop-in replacements where qualification and long-term supply continuity are critical, especially in automotive and industrial OEM programs.
Availability
AH173-WG-7-B is available at Aetrix Electronics and suitable for 3-phase BLDC motor commutation, rotor position sensing, current switch feedback, and RPM detection requiring stable component supply despite its NRND status for legacy design support.
Supply support for AH173-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 signal integrity, power management, and sensing solutions for automotive, industrial, and computing markets.
The AH173 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust magnetic position and speed sensing in harsh thermal and electromagnetic environments-prioritizing latch stability, wide supply tolerance, and integrated passive components.
FAQ
Is AH173-WG-7-B AEC-Q100 qualified?
No. AH173-WG-7-B is not AEC-Q100 qualified. It lacks formal automotive qualification documentation and PPAP support. For AEC-Q100-compliant alternatives, Diodes recommends AH3722A or AH3724A, both qualified to Grade 0 (−40°C to +150°C) and manufactured in IATF 16949-certified facilities.
Can AH173-WG-7-B replace AH173-PG-B-B in SIP-3 package?
No. AH173-WG-7-B uses SC59 (SOT23) package with different pin pitch, thermal profile, and pad layout than SIP-3 variants. Mechanical and soldering requirements differ significantly; board redesign is required for substitution. Electrical functionality is identical, but thermal derating curves and mounting constraints are not interchangeable.
What is the meaning of "NRND" in the ordering information?
"NRND" stands for "Not Recommended for New Design." Diodes has discontinued active development and marketing of AH173 for new projects. It remains available for legacy production and repair, but long-term supply is not guaranteed beyond current inventory. Customers are advised to migrate to AH3722A or AH3724A for future designs.
Does AH173-WG-7-B require an external pullup resistor?
No. AH173-WG-7-B integrates a 7–13 kΩ pullup resistor internally. The OUT pin is open-drain and actively sinks current when triggered; no external pullup is needed. This reduces bill-of-materials count and simplifies PCB layout compared to discrete Hall switches without internal biasing.
AH173-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:
- 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:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH173-WG-7-B FAQ
1.How can I place an order for AH173-WG-7-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH173-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 AH173-WG-7-B reliable?
The price and inventory of AH173-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 AH173-WG-7-B is usually 5 days.
3.What payment methods are accepted for AH173-WG-7-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH173-WG-7-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH173-WG-7-B?
AH173-WG-7-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH173-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 AH173-WG-7-B?
For technical support, including AH173-WG-7-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH173-WG-7-B requirements.
6.How does Aetrix verify that AH173-WG-7-B is sourced from the original manufacturer or authorized distributors?
All AH173-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 AH173-WG-7-B meets industry standards.
7.What is the process for return or replacement of AH173-WG-7-B?
All AH173-WG-7-B units undergo pre-shipment inspection (PSI). If there is an issue with AH173-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 AH173-WG-7-B part is unused and in its original packaging.
Return procedure for AH173-WG-7-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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