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Diodes Incorporated AH3724-P-B
- Part No.:
- AH3724-P-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH3724-P-B.pdf
- Description:
- HALL LATCH SWITCH SIP-3 BULK 1K
- Quantity:
- Payment:
- Shipping:
Inventory:2,986
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Product details
Overview
AH3724-P-B from Diodes Incorporated is a high-voltage bipolar Hall-effect latch IC designed for brushless DC motor commutation and angular position sensing in automotive and industrial systems. It operates from 3.0V to 28V, features open-drain output with 30–55mA current limiting, BOP of 20–60G (South pole activation), BRP of –60 to –20G (North pole release), and operates across –40°C to +125°C.
For engineers reviewing the AH3724-P-B datasheet, AH3724-P-B pinout, AH3724-P-B application, or AH3724-P-B equivalent, this device is selected for robust magnetic sensing in high-temperature, wide-supply environments where latch behavior, ESD resilience (8kV HBM), and supply-side protection (reverse blocking diode + zener clamp) are critical.
Technical Context
The AH3724-P-B uses chopper-stabilized architecture with dynamic offset cancellation to minimize switch-point drift over temperature and supply voltage. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, enabling stable operation across –40°C to +125°C and 3.0V–28V VDD.
It implements a bipolar latch function: South-pole magnetic field > BOP (20–60G) pulls OUTPUT low; North-pole field < BRP (–60 to –20G) releases the latch. The single open-drain output includes overcurrent limiting and zener clamping, and the supply rail integrates reverse-blocking diode protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - supports direct battery-sensing in 12V/24V automotive and industrial rails without external regulation. |
| BOP / BRP (Typ) | 40G / –40G - enables reliable latching with moderate-strength magnets at typical air gaps in BLDC rotor position detection. |
| Output Type | Open-drain - allows flexible pull-up to any logic rail (e.g., 3.3V, 5V, or 12V) and wired-OR interfacing. |
| Output Current Limit | 30–55mA - protects internal switch during short-circuit or heavy capacitive loads while sustaining drive capability. |
| Startup Time | 10µs (typ) - ensures rapid system readiness after power-on, critical for real-time RPM measurement loops. |
| ESD Rating | 8kV HBM - provides robust handling margin during PCB assembly and end-equipment service in factory environments. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial motor control enclosures. |
Pinout & Package
Package: SIP-3 (Bulk Pack) - 3-pin straight-lead through-hole package with 14.5mm body length, optimized for high-reliability mounting in vibration-prone motor assemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power input with integrated reverse-blocking diode and zener clamp - tolerates –18V reverse transients and 32V surges. |
| 2 | GND | Ground reference for internal regulator, Hall sensor, and output stage - requires low-impedance connection for noise immunity. |
| 3 | OUTPUT | Open-drain NMOS output - sinks up to 55mA; requires external pull-up resistor (RL) for logic-level signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper stabilization | Reduces thermal drift of BOP/BRP to ±5G over –40°C to +125°C, ensuring consistent switching thresholds in engine bay environments. |
| Bipolar latch logic | Eliminates need for external Schmitt trigger or debouncing circuitry in rotary position feedback paths. |
| Integrated supply protection | Reverse-blocking diode + zener clamp on VDD enables direct connection to unregulated battery rails without external TVS or diode. |
| High RF noise immunity | Validated against common-mode and differential RF interference per ISO 11452-4, suitable for noisy motor drive zones. |
| Lead-free & green compliance | Fully RoHS 3 (2015/863/EU), halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb) - meets automotive Tier-1 material declarations. |
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: Hall latch providing synchronized edge-triggered signals to MCU timer capture inputs for precise 120° electrical phase alignment. Use Value: Enables accurate, jitter-free commutation at up to 30,000 RPM using only passive magnet targets - no encoder wheel required. |
Use Scenario: Counting magnetic transitions on rotating shafts in HVAC blowers, power tools, and pump controllers. IC Role / Device Role / Timing Role: Latched output delivers clean, bounce-free pulses to microcontroller counter peripherals for real-time speed calculation. Use Value: Delivers sub-1% speed error over full temperature range due to stable BOP/BRP hysteresis (80G typ) and fast 10µs startup. |
| Flow Meter Sensing | Linear Position Indexing |
|
Use Scenario: Monitoring rotation of turbine or paddle-wheel elements in liquid/gas flow meters for utility metering. IC Role / Device Role / Timing Role: Magnetic latch detecting each blade pass to generate pulse train proportional to volumetric flow rate. Use Value: Operates reliably at 3.0V minimum supply - compatible with battery-powered smart meters; 8kV ESD withstand prevents field failures. |
Use Scenario: Detecting discrete positions of linear actuators, valve stems, or sliding panels in industrial automation. IC Role / Device Role / Timing Role: Latch output toggles on approach/recession of ferrous target, providing absolute position state without continuous polling. Use Value: 40G operate point allows use with small, low-cost magnets at 2–4mm air gaps - reduces mechanical tolerance stack-up in compact assemblies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3724QSA-7 | Automotive-grade (AEC-Q100 Grade 0), same BOP/BRP specs but qualified to +150°C junction temp and enhanced ESD (12kV HBM). | Required for under-hood engine control modules; not needed for industrial motor drives outside extreme ambient zones. | Select when AEC-Q100 compliance and extended junction rating are mandatory - otherwise AH3724-P-B offers identical magnetic performance at lower cost. |
| US1881LUA-AAA-000 | Lower sensitivity (BOP = 35G min), 2.5–24V supply, no reverse-blocking diode on VDD - requires external protection. | Suitable for consumer appliances with regulated 5V supplies; lacks robustness for direct battery connection in automotive or industrial settings. | Choose only if supply is tightly regulated and cost sensitivity outweighs protection and temperature margin requirements. |
Compared with AL3724QSA-7 and US1881LUA-AAA-000, the AH3724-P-B delivers optimal balance of automotive-grade reliability (125°C ambient, 8kV ESD, integrated supply protection) and industrial cost efficiency - making it ideal for non-AEC-Q100 but thermally demanding applications like power tool controllers and HVAC blower modules.
Availability
AH3724-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 Tier-2, industrial OEM, and white-goods production programs.
Supply support for AH3724-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 belongs to Diodes' high-voltage Hall-effect sensor product line, engineered specifically for robust magnetic position and speed sensing in harsh environments including automotive powertrain, industrial motor control, and energy infrastructure.
FAQ
What is the magnetic polarity requirement for AH3724-P-B operation?
The AH3724-P-B is a bipolar latch: it turns ON (pulls OUTPUT low) when a South pole with flux density exceeding +20G to +60G is applied perpendicular to the marked side of the SIP-3 package, and turns OFF when a North pole exceeding –20G to –60G is applied. Polarity orientation depends on package type - for SIP-3 (Bulk Pack), South pole must face the part-marking side.
Can AH3724-P-B be used with a 3.3V microcontroller I/O pin?
Yes - its open-drain OUTPUT is compatible with 3.3V logic when paired with a 3.3V pull-up resistor. The output saturation voltage is ≤0.4V at 20mA, ensuring solid LOW-level recognition. No level-shifting is required, though RL must be selected to limit current within the 30–55mA output limit.
Does AH3724-P-B require an external bypass capacitor?
Yes - a 10nF to 100nF ceramic capacitor (CIN) between VDD and GND is required for power stabilization and RF noise immunity, as specified in the typical application circuit. Omitting CIN increases susceptibility to supply-line transients and may cause erratic switching in electrically noisy environments like motor drives.
Is AH3724-P-B pin-compatible with other AH372X variants?
Yes - all AH372X devices (AH3722, AH3724, AH3725, AH3727) share identical SIP-3 (Bulk Pack) pinout (VDD-GND-OUTPUT), SC59, SOT23, and SIP-3 (Ammo Pack) footprints. Only magnetic sensitivity (BOP/BRP) differs; electrical interface, protection features, and timing parameters are fully interchangeable.
AH3724-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
AH3724-P-B FAQ
1.How can I place an order for AH3724-P-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3724-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 AH3724-P-B reliable?
The price and inventory of AH3724-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 AH3724-P-B is usually 5 days.
3.What payment methods are accepted for AH3724-P-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3724-P-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3724-P-B?
AH3724-P-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3724-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 AH3724-P-B?
For technical support, including AH3724-P-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3724-P-B requirements.
6.How does Aetrix verify that AH3724-P-B is sourced from the original manufacturer or authorized distributors?
All AH3724-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 AH3724-P-B meets industry standards.
7.What is the process for return or replacement of AH3724-P-B?
All AH3724-P-B units undergo pre-shipment inspection (PSI). If there is an issue with AH3724-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 AH3724-P-B part is unused and in its original packaging.
Return procedure for AH3724-P-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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