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Diodes Incorporated AH3722-P-A
- Part No.:
- AH3722-P-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP, Formed Leads
- Datasheet:
-
AH3722-P-A.pdf
- Description:
- HALL LATCH SWITCH SIP-3 AMMO 1K
- Quantity:
- Payment:
- Shipping:
Inventory:1,583
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Product details
Overview
AH3722-P-A from Diodes Incorporated is a high-voltage, bipolar Hall-effect latch IC designed for brushless DC motor commutation and RPM sensing in automotive and industrial systems. It operates from 3.0V to 28V, features ±25G to ±40G magnetic operate/release points (BOP/BRP), delivers <0.4V output saturation at 20mA, and supports -40°C to +125°C ambient operation with 8kV HBM ESD rating.
For engineers reviewing the AH3722-P-A datasheet, AH3722-P-A pinout, AH3722-P-A application, or AH3722-P-A equivalent, key selection criteria include its open-drain output with overcurrent limit, chopper-stabilized temperature stability, reverse supply protection, and SIP-3 (Ammo Pack) package compatibility with high-reliability position-sensing layouts.
Technical Context
The AH3722-P-A uses chopper-stabilized architecture with dynamic offset cancellation to minimize switch-point drift across temperature and supply voltage. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, enabling stable BOP/BRP thresholds from -40°C to +125°C.
It implements a true bipolar latch function: South pole exposure switches the open-drain output low (latched), and North pole exposure releases it high (latched off). Magnetic hysteresis (BHY = 20–80G) ensures noise-immune state retention without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - enables direct connection to 12V/24V automotive and industrial rails without regulation. |
| BOP / BRP (Typ) | +25G / -25G - precise latching threshold for low-strength magnet applications like small BLDC rotors. |
| VOUT_ON | 0.4V max @ 20mA - ensures robust logic-low level even under load, compatible with 3.3V/5V microcontroller inputs. |
| Startup Time | 10µs typical - guarantees fast system readiness after power-on, critical for real-time motor control loops. |
| Output Type | Open-drain with 30–55mA current limit - allows flexible pull-up configuration and intrinsic short-circuit protection. |
| ESD Rating | 8kV HBM - meets automotive-grade robustness requirements for assembly and field operation. |
| Operating Temp | -40°C to +125°C - qualified for under-hood and industrial enclosure environments without derating. |
Pinout & Package
Package: SIP-3 (Ammo Pack), 3-pin single-inline package with gull-wing leads, optimized for automated insertion and high-vibration reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power input with integrated reverse-blocking diode and zener clamp - tolerates -18V reverse transients and 32V spikes. |
| 2 | GND | Ground reference for internal regulator and Hall sensor - requires low-impedance PCB return path for noise immunity. |
| 3 | OUTPUT | Open-drain output with 30–55mA current limit - must be externally pulled up; drives LEDs, optocouplers, or MCU GPIOs directly. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar Latch Operation | South pole activates, North pole deactivates - eliminates need for dual-sensor setups in rotary position detection. |
| Chopper-Stabilized Core | ±0.5G typical BOP drift over -40°C to +125°C - maintains consistent switching points without calibration. |
| Integrated Supply Protection | Reverse-blocking diode + 28V zener clamp on VDD - prevents damage during battery reversal or load-dump events. |
| RF Noise Immunity | Validated against 100MHz–1GHz RF fields per IEC 61000-4-3 - sustains reliable operation near motors and inverters. |
| Lead-Free & Green | Halogen- and antimony-free, RoHS 3 compliant (<900ppm Br/Cl, <1000ppm Sb) - satisfies global environmental compliance mandates. |
Applications
| BLDC Motor Commutation | RPM Measurement |
|---|---|
|
Use Scenario: Detecting rotor pole position in 3-phase brushless DC fans and pumps. IC Role / Device Role / Timing Role: Hall latch providing synchronized commutation signals to gate driver ICs. Use Value: Enables precise 6-step commutation with <10µs startup latency and no external hysteresis components. |
Use Scenario: Counting magnetic transitions on rotating shafts in HVAC blowers and industrial conveyors. IC Role / Device Role / Timing Role: Digital edge-triggered tachometer sensor interfacing directly to MCU timer capture inputs. Use Value: Delivers clean, jitter-free pulses up to 100kHz with built-in noise filtering, eliminating debounce firmware overhead. |
| Flow Meter Sensing | Linear Position Indexing |
|
Use Scenario: Monitoring turbine rotation in water/gas metering modules with sealed housings. IC Role / Device Role / Timing Role: Contactless speed-to-frequency converter detecting magnetized impeller blades. Use Value: Operates reliably at 3.0V minimum supply and withstands 28V surges common in utility meter power domains. |
Use Scenario: Detecting discrete positions of linear actuators in office automation and medical devices. IC Role / Device Role / Timing Role: Absolute position latch indicating home/limit switch states via magnet proximity. Use Value: Provides fail-safe latched output with 20–80G hysteresis, preventing false triggers from mechanical vibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3722QSA-7 | Automotive-qualified (AEC-Q100 Grade 1), same BOP/BRP specs, SC59 package. | Required for production automotive ECUs; higher qualification cost and longer lead time. | Select when ISO/TS 16949-compliant traceability and extended temperature validation are mandatory. |
| US1881LUA-AAA-000 | Lower sensitivity (BOP = ±60G), 2.5–24V range, SOT-23 package, no reverse-voltage protection. | Suitable for consumer appliances with controlled environments and lower-cost BOM targets. | Choose only if magnetic field strength exceeds 60G and reverse-polarity risk is eliminated by system design. |
Compared with AL3722QSA-7 and US1881LUA-AAA-000, the AH3722-P-A uniquely balances industrial-grade voltage robustness (3–28V + reverse clamp), SIP-3 mechanical reliability, and cost-effective qualification-making it optimal for non-automotive high-voltage motion control where AEC-Q100 is unnecessary.
Availability
AH3722-P-A is available at Aetrix Electronics and suitable for brushless DC motor control, flow metering, and linear position indexing requiring stable component supply across extended temperature and voltage ranges.
Supply support for AH3722-P-A 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, automotive, and computing markets.
The AH372X series belongs to Diodes' high-voltage Hall-effect sensor product line, engineered specifically for robust, contactless position and speed sensing in harsh electrical environments.
FAQ
What is the magnetic polarity behavior of the AH3722-P-A?
The AH3722-P-A is a bipolar latch: a South pole applied to the marked side switches the open-drain output low (active), and a North pole applied to the same side releases it high (inactive). The device retains its last state until the opposite pole is detected, providing inherent memory without external latching circuitry.
Can the AH3722-P-A operate directly from a 24V truck battery?
Yes - the AH3722-P-A supports 3.0V to 28V supply voltage and includes an integrated reverse-blocking diode plus 28V zener clamp on VDD. It withstands automotive load-dump transients and battery reversal without external protection components, making it suitable for direct 24V rail connection in commercial vehicle systems.
What external components are required for basic operation?
Only two passive components: a 10nF–100nF ceramic decoupling capacitor (CIN) between VDD and GND for noise suppression, and a pull-up resistor (RL) on the OUTPUT pin. Typical RL values range from 1kΩ to 10kΩ depending on rise-time and drive strength requirements; no additional hysteresis or filtering circuitry is needed.
How does the chopper stabilization improve performance over conventional Hall sensors?
Chopper stabilization actively cancels offset voltage drift in the Hall element and amplifier chain, reducing BOP/BRP variation to ±0.5G over -40°C to +125°C. This eliminates thermal recalibration needs and ensures consistent switching thresholds across operating conditions - unlike non-chopped sensors that exhibit >5G drift over the same range.
AH3722-P-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP, Formed Leads
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH3722-P-A FAQ
1.How can I place an order for AH3722-P-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3722-P-A 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 AH3722-P-A reliable?
The price and inventory of AH3722-P-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3722-P-A is usually 5 days.
3.What payment methods are accepted for AH3722-P-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3722-P-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3722-P-A?
AH3722-P-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3722-P-A 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 AH3722-P-A?
For technical support, including AH3722-P-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3722-P-A requirements.
6.How does Aetrix verify that AH3722-P-A is sourced from the original manufacturer or authorized distributors?
All AH3722-P-A 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 AH3722-P-A meets industry standards.
7.What is the process for return or replacement of AH3722-P-A?
All AH3722-P-A units undergo pre-shipment inspection (PSI). If there is an issue with AH3722-P-A, 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 AH3722-P-A part is unused and in its original packaging.
Return procedure for AH3722-P-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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