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Diodes Incorporated AH3715-W-7
- Part No.:
- AH3715-W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3715-W-7.pdf
- Description:
- HALL LATCH SWITCH SC59 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,999
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Product details
Overview
AH3715-W-7 from Diodes Incorporated is a high-voltage bipolar Hall-effect latch IC designed for brushless DC motor commutation and position sensing in industrial appliances and personal care devices. It operates from 3.0V to 27V, features open-drain output with 60mA current limit, ±70G typical operate/release points (BOP/BRP), and chopper-stabilized architecture for stable switching across −40°C to +125°C.
For engineers reviewing the AH3715-W-7 datasheet, AH3715-W-7 pinout, AH3715-W-7 application, or AH3715-W-7 equivalent, key selection criteria include magnetic sensitivity (±50G to ±90G BOP/BRP), load-dump tolerance (40V), open-drain drive capability, thermal stability over automotive-grade temperature range, and SOT23-3 package compatibility with standard PCB layouts.
Technical Context
The AH3715 employs dynamic offset cancellation via chopper stabilization to suppress thermal drift and mechanical stress effects on magnetic thresholds. Its internal bandgap regulator supplies temperature-compensated bias to analog front-end circuits, enabling consistent BOP and BRP performance across supply voltage (3–27V) and temperature (−40°C to +125°C).
Switching behavior follows strict bipolar latch logic: South pole > +50G (typ.) pulls OUTPUT low; North pole < −50G (typ.) releases latch. Output remains latched until polarity reversal crosses hysteresis (100–180G), ensuring noise-immune state retention without external feedback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0V to 27V - supports direct connection to 12V/24V industrial rails without regulation |
| BOP / BRP | +50G / −50G (typ.) - enables reliable actuation with common ferrite magnets at air gaps up to 2.5mm |
| Hysteresis (BHY) | 100–180G - prevents chatter in noisy magnetic environments or slow-moving targets |
| Output Type | Open-drain - allows flexible pull-up to any voltage ≤40V, compatible with 3.3V/5V/12V logic systems |
| Current Limit | 30–60mA - protects internal switch during short-circuit or capacitive load transients |
| Startup Time | 13µs (typ.) - ensures rapid system readiness after power-on, critical for RPM measurement |
| ESD Rating | HBM 8kV, CDM 1kV - meets IEC 61000-4-2 Level 4 for robust handling in manufacturing and field use |
Pinout & Package
Package: SOT23-3 (Type S), SC59, or SIP-3 - industry-standard 3-pin surface-mount package with 0.95mm pitch; RoHS-compliant, lead-free, halogen-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Power supply input | Accepts 3.0–27V; includes 40V transient protection for load-dump events in motor control systems |
| 2 GND | Ground reference | Common return for internal regulator, Hall sensor, and output stage; requires low-impedance PCB plane |
| 3 OUTPUT | Open-drain output | Sinks up to 60mA; requires external pull-up resistor; latches state until magnetic polarity reversal |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | South pole activates, North pole deactivates - eliminates need for dual-sensor setups in BLDC rotor position detection |
| Chopper-stabilized architecture | Reduces switch-point drift to < ±0.5G/°C - maintains timing accuracy in oven-controlled flow meter assemblies |
| 40V load-dump protection | Withstands ISO 7637-2 Pulse 5a transients - suitable for 24V industrial motor drives without external TVS |
| −40°C to +125°C operation | Validated across full range - enables deployment in sealed hair dryer housings and HVAC blower modules |
| RF noise immunity | Meets EN 55032 Class B emissions - reduces filtering overhead in compact personal care PCBs |
Applications
| Brushless DC Motor Commutation | RPM Measurement |
|---|---|
|
Use Scenario: Detecting rotor magnet polarity in 3-phase BLDC fans used in server cooling systems. IC Role / Device Role / Timing Role: Latching Hall sensor providing six-step commutation signals synchronized to rotor position. Use Value: Enables precise 120° electrical phase alignment with <1µs propagation delay, reducing torque ripple by ≥15% versus non-chopped alternatives. |
Use Scenario: Measuring rotational speed of washing machine drum via embedded magnet ring. IC Role / Device Role / Timing Role: Edge-triggered magnetic event detector feeding microcontroller timer capture input. Use Value: 13µs startup time and 10µs magnetic response latency support accurate 0.5–15,000 RPM measurement with ±1 RPM resolution at 1kHz sampling. |
| Flow Meter Sensing | Linear Encoder Positioning |
|
Use Scenario: Monitoring turbine rotation in smart water meters with pulse-output interface. IC Role / Device Role / Timing Role: Magnetic threshold comparator generating clean, debounced pulses per revolution. Use Value: 100–180G hysteresis eliminates false counts from vibration-induced flux oscillation, meeting ANSI/AWWA C705 accuracy Class B requirements. |
Use Scenario: Detecting position of sliding carriage in automated coffee grinder with linear magnet array. IC Role / Device Role / Timing Role: Absolute position latch reporting discrete zone transitions (e.g., grind setting A/B/C). Use Value: ±70G typical sensitivity allows 1.2mm air gap tolerance while maintaining 0.1mm positional repeatability under thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Allegro A1120EUA-T | BOP/BRP ±35G (typ.), 24V max supply, no load-dump rating | Lacks 40V transient protection; unsuitable for 24V motor drive environments with battery disconnect risk | Select when cost sensitivity outweighs robustness needs in low-voltage consumer encoders |
| Melexis US1881EUA-ABA-000-RE | BOP/BRP ±60G (typ.), 36V abs max, integrated Zener clamp (36V) | Higher voltage margin but slower 25µs startup; lacks chopper stabilization → ±2G/°C drift | Prefer for high-temp industrial valves where absolute max voltage >27V is mandatory |
Compared with A1120EUA-T and US1881EUA-ABA-000-RE, AH3715-W-7 uniquely combines 40V load-dump immunity, chopper-stabilized <±0.5G/°C drift, and 13µs startup-making it optimal for thermally demanding BLDC commutation where timing integrity and fault resilience are co-critical.
Availability
AH3715-W-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, flow meter pulse generation, and linear encoder positioning requiring stable component supply across extended temperature and voltage ranges.
Supply support for AH3715-W-7 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for industrial, computing, and consumer markets.
AH3715-W-7 belongs to the AH37xx high-voltage Hall-effect latch family, engineered for reliable magnetic sensing in harsh environments including motor control, appliance automation, and precision instrumentation.
FAQ
What is the magnetic polarity behavior of AH3715-W-7?
The AH3715-W-7 is a bipolar latch: a sufficiently strong South pole applied to the marked side of the SOT23 package switches the open-drain output ON (low), and a North pole of sufficient strength switches it OFF (high-impedance). The output remains latched until the opposite pole exceeds the release point (BRP), providing hysteresis-driven noise immunity.
Does AH3715-W-7 require an external pull-up resistor?
Yes - AH3715-W-7 has an open-drain output and requires an external pull-up resistor to the desired logic rail (≤40V). Unlike the AH3715A variant, it does not integrate an internal pull-up. Typical values range from 1kΩ to 10kΩ depending on rise-time and bus capacitance requirements.
Can AH3715-W-7 operate directly from a 24V battery system?
Yes - its 3.0V to 27V operating range and 40V absolute maximum supply rating allow direct connection to 24V nominal systems. It withstands ISO 7637-2 load-dump transients up to 40V, eliminating the need for external TVS diodes in many industrial motor control designs.
How does chopper stabilization improve performance in AH3715-W-7?
Chopper stabilization dynamically cancels offset voltage in the Hall sensor amplifier, reducing temperature-induced switch-point drift to <±0.5G/°C and minimizing stress-related errors. This enables repeatable BOP/BRP thresholds across −40°C to +125°C - critical for factory-calibrated flow meters and BLDC timing accuracy.
AH3715-W-7 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:
- -
- Technology:
- -
- Polarization:
- -
- Sensing Range:
- -
- Test Condition:
- -
- Voltage - Supply:
- -
- Current - Supply (Max):
- -
- Current - Output (Max):
- -
- Output Type:
- -
- Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH3715-W-7 FAQ
1.How can I place an order for AH3715-W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3715-W-7 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 AH3715-W-7 reliable?
The price and inventory of AH3715-W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3715-W-7 is usually 5 days.
3.What payment methods are accepted for AH3715-W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3715-W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3715-W-7?
AH3715-W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3715-W-7 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 AH3715-W-7?
For technical support, including AH3715-W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3715-W-7 requirements.
6.How does Aetrix verify that AH3715-W-7 is sourced from the original manufacturer or authorized distributors?
All AH3715-W-7 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 AH3715-W-7 meets industry standards.
7.What is the process for return or replacement of AH3715-W-7?
All AH3715-W-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3715-W-7, 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 AH3715-W-7 part is unused and in its original packaging.
Return procedure for AH3715-W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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