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Diodes Incorporated AH3722Q-P-B
- Part No.:
- AH3722Q-P-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH3722Q-P-B.pdf
- Description:
- HALL LATCH SWITCH SIP-3 BULK 1K
- Quantity:
- Payment:
- Shipping:
Inventory:1,191
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Product details
Overview
AH3722Q-P-B from Diodes Incorporated is an AEC-Q100 Grade 0 qualified automotive Hall-effect latch IC designed for brushless DC motor commutation and angular position sensing. It operates from 3.0V to 28V, features bipolar latching (South-on/North-off), delivers 25G typical operate point (BOP) and -25G release point (BRP), and supports -40°C to +150°C ambient operation in SC59 package.
For engineers reviewing the AH3722Q-P-B datasheet, AH3722Q-P-B pinout, AH3722Q-P-B application, or AH3722Q-P-B equivalent, key selection criteria include magnetic sensitivity tolerance across temperature, open-drain output current limit (30–55 mA), chopper-stabilized offset cancellation, reverse supply protection (-18 V), and zener-clamped output robustness in high-noise automotive environments.
Technical Context
The AH3722Q-P-B uses chopper-stabilized architecture with dynamic offset cancellation to suppress thermal drift and mechanical stress-induced errors, enabling stable switching thresholds over -40°C to +150°C. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, ensuring consistent BOP/BRP hysteresis (50 G typ) across voltage and temperature.
It implements a single open-drain output with integrated overcurrent limiting (IOCL = 30–55 mA) and bidirectional zener clamping on both VDD and OUTPUT pins. The device requires South-pole activation on the non-marking side for SC59 package - polarity orientation is package-specific and must be verified per mechanical layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0 V to 28 V - supports direct battery connection in 12 V/24 V automotive systems without external regulation |
| Operating Temperature | -40°C to +150°C - qualified for under-hood and transmission-mounted applications |
| BOP / BRP (Typ) | +25 G / -25 G - enables reliable detection of weak magnetic fields from small or distant magnets |
| Output Type | Open-drain - allows flexible pull-up to any logic rail up to 32 V and supports wired-OR configurations |
| Startup Time | 10 µs (typ) - ensures rapid system readiness after power-on, critical for engine speed measurement |
| ESD Robustness | HBM: 8 kV, CDM: 1 kV - exceeds AEC-Q100 requirements for assembly and field reliability |
| Chopping Frequency | 500 kHz - suppresses low-frequency noise and offsets while minimizing EMI impact on adjacent sensors |
Pinout & Package
Package: SC59 - surface-mount, 3-pin, lead-free, RoHS-compliant package with standard footprint and thermal performance suitable for automated reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive supply input | Accepts 3.0–28 V; includes reverse-blocking diode and zener clamp for load-dump and jump-start resilience |
| 2 - GND | Reference ground | Low-impedance return path for internal regulators and output switch; must be connected before VDD during power sequencing |
| 3 - OUTPUT | Open-drain output | Sinks up to 55 mA; internally clamped to 32 V; requires external pull-up for logic-level interface |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | South pole activates output (low), North pole releases - eliminates need for external polarity control logic |
| Chopper-stabilized sensing | Reduces switch-point drift to < ±0.5 G/°C - maintains encoder accuracy across full automotive temperature range |
| Integrated protection | VDD reverse blocking (-18 V) + zener clamp (28 V), OUTPUT zener clamp (32 V), and 55 mA current limit - reduces external protection components by ≥3 |
| AEC-Q100 Grade 0 qualification | Validated for 150°C junction operation and PPAP-capable manufacturing - meets OEM requirements for safety-critical drivetrain modules |
| RF noise immunity | Immune to >100 V/m radiated RF fields per ISO 11452-2 - sustains operation near ignition systems and infotainment transceivers |
Applications
| BLDC Motor Commutation | RPM Measurement |
|---|---|
Use Scenario: Detecting rotor position in 3-phase brushless DC motors for electric power steering (EPS) and HVAC blower systems. IC Role / Device Role / Timing Role: Hall latch providing synchronized commutation signals to gate driver ICs with sub-µs timing stability. Use Value: Enables precise 120° electrical phase alignment using only one sensor per motor, reducing BOM cost vs. dual-Hall solutions. |
Use Scenario: Measuring rotational speed of crankshaft, camshaft, or wheel speed in ABS and engine control units. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector generating clean digital pulses at frequencies up to 100 kHz. Use Value: Delivers jitter < 1 µs over temperature, supporting accurate RPM calculation even at cold cranking voltages (6.5 V). |
| Angular Position Sensing | Flow Meter Detection |
Use Scenario: Monitoring throttle valve angle or pedal position in drive-by-wire systems with redundant sensing. IC Role / Device Role / Timing Role: Latched position indicator interfaced to microcontroller GPIO with Schmitt-trigger input compatibility. Use Value: Hysteresis of 50 G prevents chatter during slow-moving or vibrating mechanical interfaces, eliminating software debouncing. |
Use Scenario: Detecting turbine rotation in automotive fuel or coolant flow meters with permanent magnet impellers. IC Role / Device Role / Timing Role: Pulse generator triggered by rotating ferrous vane or magnet, directly driving metering MCU timers. Use Value: Wide 3–28 V supply range allows direct connection to 12 V vehicle bus, eliminating local LDO and reducing system standby current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3722QTR | Same BOP/BRP specs but uses SOT23-3 (Type S) package; requires South pole on part-marking side - opposite polarity orientation vs. AH3722Q-P-B's SC59. | Preferred for space-constrained PCBs where SC59 footprint is unavailable; not drop-in due to reversed magnetic polarity and different thermal resistance. | Select when board layout accommodates SOT23-3 and magnet placement can be adjusted to marking-side activation. |
| TLE4961-2M | Higher BOP (40 G min), wider hysteresis (70 G min), and integrated diagnostics - but requires 4.5–28 V supply and lacks reverse-voltage protection. | Used in ASIL-B systems requiring fault reporting; unsuitable for 3 V start-stop or reverse-battery scenarios without external protection. | Choose only if diagnostic capability and higher sensitivity outweigh added external protection complexity and voltage limitations. |
Compared with AL3722QTR and TLE4961-2M, the AH3722Q-P-B uniquely combines ultra-wide 3–28 V operation, reverse-voltage resilience, and SC59 package polarity optimized for common automotive magnet mounting - making it optimal for cost-sensitive, high-reliability commutation and RPM sensing without design compromises.
Availability
AH3722Q-P-B is available at Aetrix Electronics and suitable for BLDC motor control, engine RPM monitoring, and angular position sensing requiring stable component supply across automotive production lifecycles.
Supply support for AH3722Q-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 automotive, industrial, and computing markets.
The AH372XQ series belongs to Diodes' AEC-Q100 qualified Hall-effect sensor product line, engineered specifically for robust, high-temperature position and speed sensing in demanding automotive subsystems.
FAQ
What is the magnetic polarity requirement for AH3722Q-P-B in SC59 package?
The AH3722Q-P-B in SC59 package requires the South pole to be applied to the non-part-marking side to activate the output. This is the inverse of SOT23 (Type S) and SIP-3 packages, where South pole must face the marking side. Mechanical orientation must match the package type to avoid functional failure.
Does AH3722Q-P-B require an external bypass capacitor?
Yes - a 10 nF to 100 nF ceramic capacitor (CIN) between VDD and GND is required for power stabilization and enhanced noise immunity. Diodes Incorporated specifies this in the Typical Applications Circuit and recommends placement within 2 mm of the VDD pin to maintain chopper stability and ESD robustness.
Can AH3722Q-P-B operate at 3.0 V supply during cold-cranking conditions?
Yes - the device is fully specified down to 3.0 V and starts up reliably within 10 µs once VDD reaches that threshold. Its chopper-stabilized core and bandgap-regulated internal supply ensure consistent BOP/BRP performance even at minimum voltage and -40°C, validated per AEC-Q100 Grade 0 testing.
Is AH3722Q-P-B pin-compatible with other AH372XQ variants?
No - all AH372XQ variants (AH3722Q through AH3729Q) share identical pinout and package dimensions, but differ in magnetic sensitivity (BOP/BRP). Swapping variants requires validation of magnetic field strength and hysteresis margin in the target application; no electrical or mechanical redesign is needed.
AH3722Q-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:
- ±6mT Trip, ±0.5mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 2.2V ~ 20V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 25mA
- Output Type:
- Digital
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH3722Q-P-B FAQ
1.How can I place an order for AH3722Q-P-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3722Q-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 AH3722Q-P-B reliable?
The price and inventory of AH3722Q-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 AH3722Q-P-B is usually 5 days.
3.What payment methods are accepted for AH3722Q-P-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3722Q-P-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3722Q-P-B?
AH3722Q-P-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3722Q-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 AH3722Q-P-B?
For technical support, including AH3722Q-P-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3722Q-P-B requirements.
6.How does Aetrix verify that AH3722Q-P-B is sourced from the original manufacturer or authorized distributors?
All AH3722Q-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 AH3722Q-P-B meets industry standards.
7.What is the process for return or replacement of AH3722Q-P-B?
All AH3722Q-P-B units undergo pre-shipment inspection (PSI). If there is an issue with AH3722Q-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 AH3722Q-P-B part is unused and in its original packaging.
Return procedure for AH3722Q-P-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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