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Diodes Incorporated AH3722-P-B
- Part No.:
- AH3722-P-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH3722-P-B.pdf
- Description:
- HALL LATCH SWITCH SIP-3 BULK 1K
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
AH3722-P-B 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 chopper-stabilized architecture for temperature stability, and delivers ±25G to ±40G magnetic operate/release points (BOP/BRP) with 20G–80G hysteresis. Its open-drain output switches on with South pole and off with North pole, supporting contactless position indexing in harsh environments.
For engineers reviewing the AH3722-P-B datasheet, AH3722-P-B pinout, AH3722-P-B application, or AH3722-P-B equivalent, key selection criteria include magnetic sensitivity range, supply voltage tolerance up to 28V, open-drain output current limit (30–55 mA), -40°C to +125°C operation, and SIP-3 bulk-pack compatibility for high-volume assembly.
Technical Context
The AH3722-P-B implements a chopper-stabilized Hall sensor with dynamic offset cancellation, delivering stable magnetic switching thresholds across temperature and supply voltage. Its internal bandgap regulator supplies temperature-compensated bias to analog circuitry, minimizing BOP/BRP drift over -40°C to +125°C.
It integrates reverse-polarity protection via an internal blocking diode and zener clamp on VDD, plus output-stage overcurrent limiting and zener clamping. The single open-drain output requires an external pull-up resistor and supports robust noise immunity through 10nF–100nF bypass capacitance (CIN).
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 external regulation. |
| BOP / BRP (Typ) | +25G / -25G - Optimized for low-field detection in proximity sensing and small-magnet BLDC rotor position tracking. |
| Hysteresis (BHY) | 20G to 80G - Prevents output chatter near threshold transitions in vibration-prone motor or flow meter applications. |
| Output Type | Open-drain - Allows wired-OR configuration and flexible logic-level interfacing with MCU GPIO or comparator inputs. |
| Startup Time | 10 µs (typ) - Ensures rapid system readiness after power-on, critical for real-time RPM measurement loops. |
| ESD Rating | 8 kV HBM - Supports handling and assembly in standard industrial environments without special ESD controls. |
| Operating Temp | -40°C to +125°C - Qualified for under-hood automotive, industrial motor drives, and outdoor equipment deployment. |
Pinout & Package
Package: SIP-3 (Bulk Pack), 3-pin straight-lead surface-mount package with 14.5 mm body length, 3.0 mm width, and 1.5 mm height. Pin 1 = VDD, Pin 2 = GND, Pin 3 = OUTPUT - compatible with standard pick-and-place feeders and reflow profiles for high-yield SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power input with integrated reverse-blocking diode and 28V zener clamp - withstands load-dump transients and incorrect polarity connection. |
| 2 | GND | Ground reference for internal regulator and Hall sensor - must be low-impedance to maintain magnetic threshold accuracy. |
| 3 | OUTPUT | Open-drain NMOS output with 30–55 mA current limit - sinks current when active; requires external pull-up for logic-high state. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar Latch Operation | South pole activates output (low), North pole releases - enables absolute angular position detection without external direction logic. |
| Chopper-Stabilized Architecture | Reduces thermal drift of BOP/BRP to <±0.1G/°C - ensures consistent commutation timing across engine bay temperature swings. |
| Integrated Protection | Reverse supply diode + VDD zener clamp + output overcurrent limit - eliminates need for discrete protection components in cost-sensitive designs. |
| RF Noise Immunity | Validated against common industrial RF interference sources - maintains reliable switching in motor drive and inverter proximity. |
| Lead-Free & Green Compliance | Halogen- and antimony-free, RoHS 3 compliant (<900 ppm Br/Cl, <1000 ppm Sb) - meets global automotive and industrial environmental mandates. |
Applications
| BLDC Motor Commutation | RPM Measurement |
|---|---|
|
Use Scenario: Detecting rotor magnet polarity in 3-phase brushless DC motors for electronic commutation timing. IC Role / Device Role / Timing Role: Provides synchronized, latched Hall signals to MCU timer capture inputs for precise 120° electrical phase alignment. Use Value: Eliminates mechanical brushes and enables >95% motor efficiency with deterministic zero-crossing detection at 0–20k RPM. |
Use Scenario: Counting magnetic pulses from rotating shafts in HVAC blowers, power tools, and industrial pumps. IC Role / Device Role / Timing Role: Generates clean, debounced digital edges per revolution for microcontroller pulse-interval measurement. Use Value: Delivers sub-1% RPM error across -40°C to +125°C due to stable BOP/BRP and <10 µs startup latency. |
| Flow Meter Sensing | Linear Position Indexing |
|
Use Scenario: Monitoring turbine or paddle-wheel rotation in water/gas meters using embedded magnets. IC Role / Device Role / Timing Role: Acts as zero-power magnetic switch triggering counter ICs or low-power MCUs in battery-operated utility meters. Use Value: Operates down to 3.0V supply and draws only 3–5 mA, enabling 10+ year battery life with lithium-thionyl chloride cells. |
Use Scenario: Detecting discrete positions on linear actuators, printer carriages, or CNC tool changers. IC Role / Device Role / Timing Role: Provides repeatable, hysteresis-filtered position flags for closed-loop motion control feedback. Use Value: 20G–80G hysteresis prevents false triggers from mechanical bounce or EMI, ensuring ±0.1 mm positional repeatability. |
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-grade AEC-Q100 qualified (Grade 1), same BOP/BRP specs but tighter production testing across temperature. | Required for safety-critical automotive powertrain or chassis modules; not needed for industrial or consumer BLDC. | Select AL3722QSA-7 only if AEC-Q100 compliance is mandated; AH3722-P-B suffices for non-automotive use cases. |
| US1881LUA-AAA-000 | Lower voltage range (2.5V–24V), higher BOP (35G typ), no integrated reverse-polarity protection. | Suitable for 5V/12V consumer appliances but lacks 28V tolerance and transient protection for 24V industrial systems. | Choose US1881LUA-AAA-000 only for cost-sensitive 5V designs where external protection is already present. |
Compared with AL3722QSA-7 and US1881LUA-AAA-000, AH3722-P-B uniquely balances 28V operation, integrated reverse-voltage protection, and SIP-3 bulk packaging-making it optimal for high-volume industrial motor control and flow meter production where reliability and assembly efficiency are prioritized over automotive qualification.
Availability
AH3722-P-B is available at Aetrix Electronics and suitable for brushless DC motor commutation, RPM measurement, and flow meter sensing requiring stable component supply across automotive, industrial, and appliance markets.
Supply support for AH3722-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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and sensing applications.
The AH372X series targets high-reliability magnetic sensing in demanding environments, with the AH3722 variant optimized for low-field, high-temperature BLDC and encoder applications requiring robustness and minimal external components.
FAQ
What is the magnetic polarity behavior of AH3722-P-B?
The AH3722-P-B is a bipolar latch: its output switches ON (pulls low) when exposed to a sufficient South pole magnetic field perpendicular to the package marking side, and remains latched until a sufficient North pole field causes release. This behavior is confirmed in the datasheet's magnetic characteristics table and functional block diagram, with BOP = +10 to +40 G and BRP = -40 to -10 G across temperature.
Does AH3722-P-B require an external capacitor?
Yes - a 10 nF to 100 nF ceramic bypass capacitor (CIN) between VDD and GND is required per the Typical Applications Circuit and Electrical Characteristics notes. This stabilizes the internal bandgap regulator, improves noise immunity, and ensures reliable startup within 10 µs; omission risks erratic switching or failure to initialize.
Can AH3722-P-B operate directly from a 24V truck battery?
Yes - AH3722-P-B supports 3.0V to 28V continuous operation and includes a reverse-blocking diode plus VDD zener clamp rated at 28V. It withstands automotive load-dump transients up to 32V (absolute max, non-operational) and operates reliably across cold-crank (6.5V) to alternator-regulated (14.5V) and heavy-duty 24V nominal systems.
What is the difference between AH3722-P-B and AH3722-P-A?
AH3722-P-B uses SIP-3 Bulk Pack (straight-lead), while AH3722-P-A uses SIP-3 Ammo Pack (spread-lead). Both share identical die, electrical specs, and magnetic performance. The distinction is purely packaging: bulk pack suits manual or semi-automated insertion; ammo pack is optimized for high-speed automated placement with tape-and-reel compatibility.
AH3722-P-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Latch, Bipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- 4mT Trip, -4mT Release
- Test Condition:
- -40°C ~ 125°C
- Voltage - Supply:
- 3V ~ 28V
- Current - Supply (Max):
- 5mA
- Current - Output (Max):
- 55mA
- Output Type:
- Open Drain
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH3722-P-B FAQ
1.How can I place an order for AH3722-P-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3722-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 AH3722-P-B reliable?
The price and inventory of AH3722-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 AH3722-P-B is usually 5 days.
3.What payment methods are accepted for AH3722-P-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3722-P-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3722-P-B?
AH3722-P-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3722-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 AH3722-P-B?
For technical support, including AH3722-P-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3722-P-B requirements.
6.How does Aetrix verify that AH3722-P-B is sourced from the original manufacturer or authorized distributors?
All AH3722-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 AH3722-P-B meets industry standards.
7.What is the process for return or replacement of AH3722-P-B?
All AH3722-P-B units undergo pre-shipment inspection (PSI). If there is an issue with AH3722-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 AH3722-P-B part is unused and in its original packaging.
Return procedure for AH3722-P-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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