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Diodes Incorporated AH3782-W-7
- Part No.:
- AH3782-W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3782-W-7.pdf
- Description:
- MAGNETIC SWITCH LATCH SC59
- Quantity:
- Payment:
- Shipping:
Inventory:2,842
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Product details
Overview
AH3782-W-7 from Diodes Incorporated is a high-voltage, high-sensitivity bipolar Hall-effect latch IC in SC59 package, designed for brushless DC motor commutation and position sensing. It operates from 3.0V to 28V, features ±40G typical magnetic operate/release points, internal pullup resistor (10–18 kΩ), and latched output switching via South/North pole polarity-configured for North-pole activation on the part-marking side in SC59.
For engineers reviewing the AH3782-W-7 datasheet, AH3782-W-7 pinout, AH3782-W-7 application, or AH3782-W-7 equivalent, this device supports robust industrial RPM measurement, flow metering, and contactless angular indexing where wide supply range, thermal stability, and integrated protection (Zener clamps, overcurrent limit) are critical selection criteria.
Technical Context
The AH3782 employs chopper-stabilized architecture with dynamic offset cancellation and an internal bandgap regulator to deliver temperature-compensated operation across −40°C to +125°C. Its magnetic switching behavior is defined by BOP = +40G and BRP = −40G (typical at +25°C), with 80G hysteresis ensuring noise-immune latching.
Output control uses a low-side N-channel switch with 30–55 mA current limit and <0.4 V saturation voltage at 20 mA load. The internal 10–18 kΩ pullup eliminates external components, while Zener clamps on VDD and OUTPUT pins provide transient protection up to 32 V (non-operational stress rating).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0 V to 28 V - enables direct interface with 12 V/24 V industrial rails without regulation |
| Magnetic Operate Point (BOP) | +40 G typical - detects weak magnetic fields for low-power rotor position sensing |
| Magnetic Release Point (BRP) | −40 G typical - provides 80 G hysteresis to reject mechanical vibration and EMI-induced false triggers |
| Output Saturation Voltage | 0.2–0.4 V at 20 mA - ensures minimal power loss and compatible logic-low level for microcontroller inputs |
| Internal Pullup Resistance | 10–18 kΩ - eliminates need for external resistor, simplifying PCB layout and reducing BOM count |
| Startup Time | 10 µs typical - guarantees valid output state within microseconds of VDD reaching 3 V |
| Chopping Frequency | 800 kHz - suppresses 1/f noise and enables stable operation under thermal drift and mechanical stress |
Pinout & Package
SC59 package: 3-pin surface-mount, 2.8 mm × 2.9 mm footprint, 1.1 mm height, with exposed die pad for thermal performance. Pin 1: VDD (power input); Pin 2: GND (ground reference); Pin 3: OUTPUT (open-drain, internally pulled up).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Power Supply Input | Accepts 3.0–28 V DC; includes Zener clamp to 32 V for transient surge protection |
| 2 - GND | Ground Reference | Common return path for internal regulator, sensor, and output stage; must be low-impedance |
| 3 - OUTPUT | Open-Drain Output with Internal Pullup | Switches low when B > BOP; remains latched until B reverses below BRP; no external pullup required |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar Latch Operation | North pole activates output in SC59 package - matches standard BLDC rotor magnet orientation on marked side |
| Chopper-Stabilized Sensing | 800 kHz chopping frequency - eliminates offset drift and enables ±0.5 G repeatability over temperature |
| Integrated Protection | Zener clamps on VDD and OUTPUT + 30–55 mA output current limit - removes need for external TVS or current-limiting resistors |
| Wide-Temperature Operation | −40°C to +125°C ambient - validated for motor control environments including sealed appliance housings and industrial enclosures |
| ESD Robustness | 6 kV HBM - withstands handling and assembly without additional ESD safeguards |
Applications
| Brushless DC Motor Commutation | RPM Measurement |
|---|---|
|
Use Scenario: Detecting rotor magnet polarity in 3-phase BLDC fans used in HVAC systems and kitchen appliances. IC Role / Device Role / Timing Role: Hall latch providing synchronized commutation signals to gate driver ICs with precise edge timing (3.75 µs delay). Use Value: Enables efficient, silent motor operation using only one IC per phase - no external biasing or filtering required due to internal pullup and RF immunity. |
Use Scenario: Counting gear tooth transitions in industrial pump flow meters with 12 V supply and harsh EMI environment. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector generating clean digital pulses for microcontroller timer capture. Use Value: Delivers jitter-free pulse train with <1 µs rise/fall times and 80 G hysteresis - eliminating missed counts during vibration or voltage ripple. |
| Linear Encoder Position Sensing | Contactless Angular Indexing |
|
Use Scenario: Measuring linear displacement in washing machine drum suspension systems using magnet-embedded slider rail. IC Role / Device Role / Timing Role: Latched position indicator reporting discrete travel zones via open-drain output tied to MCU GPIO. Use Value: Stable switching at ±40 G thresholds ensures consistent zone detection across temperature (-40°C to +125°C) without recalibration. |
Use Scenario: Detecting camshaft position in cordless power tool gearboxes with compact SC59 mounting on motor housing. IC Role / Device Role / Timing Role: Index pulse generator triggered by embedded magnet on rotating cam, synchronized to mechanical rotation. Use Value: SC59's small footprint and North-pole-on-marking-side activation simplify mechanical integration - no polarity reversal needed in assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3724A | Successor device with improved BOP/BRP tolerance (±30G min), lower IDD (3.2 mA typ), and AEC-Q100 Grade 1 qualification | Qualified for automotive-grade temperature cycling and humidity testing; supports safety-critical BLDC subsystems | Select AH3724A for new designs requiring extended reliability, automotive compliance, or tighter magnetic threshold control |
| US1881 | Lower voltage range (2.5–24 V), no internal pullup, 50 G BOP/BRP, SOT-23 only | Lacks Zener clamps and overcurrent limit; requires external pullup and protection components | Choose US1881 only for cost-sensitive, non-industrial applications where external components are acceptable and supply stays ≤24 V |
Compared with AH3782-W-7, AH3724A offers higher reliability and automotive qualification but requires layout revision for pin-compatible placement; US1881 reduces unit cost but increases design complexity and reduces system-level robustness in industrial settings.
Availability
AH3782-W-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, flow metering, and linear encoder position sensing requiring stable component supply across industrial temperature ranges and long-lifecycle production programs.
Supply support for AH3782-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, consumer, and computing markets, with manufacturing certified to IATF 16949 and ISO 9001 standards.
The AH3782 belongs to Diodes' Hall-effect sensor product line, engineered for high-reliability magnetic position and speed sensing in demanding environments where wide voltage range, thermal stability, and integrated protection are essential.
FAQ
What magnetic polarity activates the AH3782-W-7 output?
The AH3782-W-7 in SC59 package activates (pulls output low) when a North pole is applied to the part-marking surface. This is explicitly defined in the datasheet's magnetic polarity table and differs from SOT23/SIP-3 variants, which require South pole activation on the marking side. Polarity is fixed per package type and cannot be reversed via configuration.
Does the AH3782-W-7 require an external pullup resistor?
No. The AH3782-W-7 integrates a 10–18 kΩ pullup resistor on the OUTPUT pin, enabling direct connection to a microcontroller GPIO without external components. This is confirmed in the "Features" section and electrical characteristics table (RPU parameter), and verified in the functional block diagram showing internal pullup topology.
Can the AH3782-W-7 operate reliably at 28 V continuously?
Yes. The datasheet specifies 3.0 V to 28 V as the recommended continuous operating voltage range. While the absolute maximum VDD is 32 V (transient only), 28 V is fully supported across −40°C to +125°C, with supply current remaining within 3.8–5.8 mA and output saturation voltage stable at ≤0.4 V under 20 mA load.
Is the AH3782-W-7 suitable for automotive applications?
No. The AH3782-W-7 is not AEC-Q100 qualified and is explicitly marked "NOT RECOMMENDED FOR NEW DESIGNS" in favor of the AH3724A, which meets AEC-Q100 Grade 1 requirements. Diodes states that automotive-grade change control, PPAP capability, and IATF 16949 manufacturing are only available for designated automotive-qualified parts-not the AH3782 series.
AH3782-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:
- Obsolete
- Function:
- Latch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 6mT Trip, -6mT Release
- Test Condition:
- -40°C ~ 125°C
- Voltage - Supply:
- 3V ~ 28V
- Current - Supply (Max):
- 5.8mA
- Current - Output (Max):
- 60mA
- Output Type:
- Open Drain
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH3782-W-7 FAQ
1.How can I place an order for AH3782-W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3782-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 AH3782-W-7 reliable?
The price and inventory of AH3782-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 AH3782-W-7 is usually 5 days.
3.What payment methods are accepted for AH3782-W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3782-W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3782-W-7?
AH3782-W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3782-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 AH3782-W-7?
For technical support, including AH3782-W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3782-W-7 requirements.
6.How does Aetrix verify that AH3782-W-7 is sourced from the original manufacturer or authorized distributors?
All AH3782-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 AH3782-W-7 meets industry standards.
7.What is the process for return or replacement of AH3782-W-7?
All AH3782-W-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3782-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 AH3782-W-7 part is unused and in its original packaging.
Return procedure for AH3782-W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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