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Diodes Incorporated AH3782-P-B
- Part No.:
- AH3782-P-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP Module
- Datasheet:
-
AH3782-P-B.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,977
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Product details
Overview
AH3782-P-B from Diodes Incorporated is a high-voltage, high-sensitivity bipolar Hall-effect latch IC with internal pullup resistor, designed for brushless DC motor commutation and position sensing in industrial and consumer appliances. It operates from 3.0V to 28V, features ±40G typical magnetic operate/release points (BOP/BRP), -40°C to +125°C temperature range, and chopper-stabilized architecture for thermal stability.
For engineers reviewing the AH3782-P-B datasheet, AH3782-P-B pinout, AH3782-P-B application, or AH3782-P-B equivalent, this page delivers verified functional identity, package-specific polarity behavior, magnetic switching thresholds, internal pullup value, output current limit, and validated alternatives for motor control and RPM sensing designs.
Technical Context
The AH3782 employs dynamic offset cancellation via chopper stabilization to suppress thermal drift and mechanical stress effects on magnetic thresholds. Its bandgap-regulated internal supply ensures consistent operation across voltage (3–28V) and temperature (-40°C to +125°C) extremes.
Magnetic polarity response is package-dependent: SIP-3 (Bulk Pack, including AH3782-P-B) requires South pole applied to the part marking surface to activate output (low), while SC59/SOT23 require North pole on the marking side. Output latching persists until flux reverses beyond BRP, enabling robust position indexing without external memory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - supports direct connection to 12V/24V industrial rails without external regulation. |
| BOP / BRP (Typical) | +40G / -40G - enables reliable switching with low-strength magnets in compact encoders and flow meters. |
| Internal Pullup Resistor | 10–18 kΩ - eliminates need for external pullup, simplifying PCB layout and reducing BOM count. |
| Output Current Limit | 30–55 mA - protects output stage during short-circuit or capacitive load transients. |
| Startup Time | 10 µs typical - ensures rapid system readiness after power-on, critical for real-time RPM measurement. |
| Zener Clamp Voltage | 28 V on VDD and OUTPUT - provides transient overvoltage protection up to 32V absolute max rating. |
| ESD Rating (HBM) | 6 kV - enhances robustness during handling and assembly in high-volume appliance manufacturing. |
Pinout & Package
AH3782-P-B is supplied in SIP-3 (Bulk Pack) package - a 3-pin straight-lead through-hole package with 0.100" lead pitch, optimized for wave soldering in home appliance motor assemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power input pin - accepts 3.0V–28V; includes integrated Zener clamp for transient suppression. |
| 2 | GND | Ground reference - must be low-impedance return path for internal regulator and output switch. |
| 3 | OUTPUT | Open-drain output with internal pullup - sinks current when activated (South pole applied); logic-low active state. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar Latch Operation | South pole activates output (low); North pole releases - enables contactless direction detection in rotary encoders. |
| Chopper Stabilization | 800 kHz chopping frequency - reduces offset drift to <±0.5G over temperature, ensuring stable BOP/BRP across -40°C to +125°C. |
| Integrated Protection | Zener clamps on VDD and OUTPUT + 60 mA continuous output current limit - eliminates need for external TVS or current-limiting resistors. |
| Magnetic Hysteresis | 40–120 G (typ. 80G) - prevents chatter near threshold in noisy mechanical environments like washing machine drum sensors. |
Applications
| Brushless DC Motor Commutation | RPM Measurement in Flow Meters |
|---|---|
Use Scenario: Detect rotor position in 3-phase BLDC motors for electronic commutation in HVAC blowers and power tools. IC Role / Device Role / Timing Role: Hall latch providing synchronized edge-triggered phase signals to motor controller MCU. Use Value: Internal pullup and wide voltage range enable direct interface to 12V/24V motor drivers without level-shifting or external biasing. |
Use Scenario: Count magnet passes on rotating impeller in water/gas flow meters for volumetric rate calculation. IC Role / Device Role / Timing Role: Magnetic event detector generating clean, debounced pulses per revolution. Use Value: 10 µs startup time and 3.75 µs magnetic-to-output delay ensure accurate high-RPM counting up to 30,000 RPM. |
| Linear Position Sensing | Contactless Angular Indexing |
Use Scenario: Monitor linear displacement of actuator rods in smart home appliances (e.g., dishwasher detergent dispensers). IC Role / Device Role / Timing Role: Threshold-based position latch detecting end-of-travel or calibration points. Use Value: ±40G sensitivity allows use with small, low-cost ferrite magnets; hysteresis prevents false triggers during vibration. |
Use Scenario: Detect angular index marks on rotating shafts in office equipment (printers, scanners) for home-position alignment. IC Role / Device Role / Timing Role: Zero-crossing latch capturing precise mechanical reference points. Use Value: SIP-3 through-hole package provides mechanical stability under repeated shock loads; -40°C to +125°C rating ensures reliability in enclosed thermal environments. |
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 (±35G min), lower IDD (3.2 mA typ), and enhanced ESD (8 kV HBM). | Pin-compatible drop-in replacement; identical SIP-3 footprint and polarity behavior. | Select AH3724A for new designs requiring extended lifecycle support and tighter magnetic specs. |
| US1881 | Lower voltage range (3.5–24V), no internal pullup (requires external 10kΩ), BOP/BRP ±50G typical. | Requires external pullup and has wider hysteresis; less suitable for space-constrained layouts. | Consider US1881 only if legacy design reuse mandates identical magnetic window and cost sensitivity outweighs layout simplicity. |
Compared with AH3782-P-B, AH3724A offers superior long-term availability and tighter parametric control, while US1881 trades integration for broader magnetic hysteresis - making AH3782-P-B optimal for cost-sensitive, volume-manufactured appliances where internal pullup and proven field reliability are prioritized.
Availability
AH3782-P-B is available at Aetrix Electronics and suitable for brushless DC motor commutation, flow meter pulse generation, and linear position sensing requiring stable component supply across industrial appliance production cycles.
Supply support for AH3782-P-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 sensor solutions for industrial and consumer markets.
AH3782 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, low-maintenance position and speed sensing in cost-sensitive, high-volume home appliance and industrial motor control systems.
FAQ
What magnetic polarity activates the AH3782-P-B output?
The AH3782-P-B uses SIP-3 (Bulk Pack) packaging, which requires a South pole applied to the part marking surface to turn the output ON (low). This is confirmed in the datasheet's magnetic polarity diagram and pin description table - opposite behavior applies to SC59/SOT23 variants.
Does AH3782-P-B require an external pullup resistor?
No. AH3782-P-B integrates a 10–18 kΩ pullup resistor on the OUTPUT pin, eliminating the need for external biasing. This is explicitly stated in the Features section and Electrical Characteristics table (RPU parameter), and verified in the Typical Applications Circuit diagram.
What is the maximum continuous output current rating?
AH3782-P-B provides 60 mA absolute maximum continuous output current, with a guaranteed current limit of 30–55 mA under overcurrent conditions. This value is specified in both Absolute Maximum Ratings (IOUT) and Electrical Characteristics (IOCL), ensuring safe drive capability into standard logic inputs or small MOSFET gates.
Is AH3782-P-B recommended for new designs?
No - Diodes Incorporated explicitly states "THE AH3782 IS NOT RECOMMENDED FOR NEW DESIGNS. PLEASE USE THE AH3724A." This notice appears on page 1 of the datasheet. AH3782-P-B remains available for legacy production support but lacks the enhanced specifications and long-term roadmap of its successor.
AH3782-P-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP Module
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH3782-P-B FAQ
1.How can I place an order for AH3782-P-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3782-P-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 AH3782-P-B reliable?
The price and inventory of AH3782-P-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3782-P-B is usually 5 days.
3.What payment methods are accepted for AH3782-P-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3782-P-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3782-P-B?
AH3782-P-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3782-P-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 AH3782-P-B?
For technical support, including AH3782-P-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3782-P-B requirements.
6.How does Aetrix verify that AH3782-P-B is sourced from the original manufacturer or authorized distributors?
All AH3782-P-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 AH3782-P-B meets industry standards.
7.What is the process for return or replacement of AH3782-P-B?
All AH3782-P-B units undergo pre-shipment inspection (PSI). If there is an issue with AH3782-P-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 AH3782-P-B part is unused and in its original packaging.
Return procedure for AH3782-P-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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