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Diodes Incorporated AH3231Q-P-B
- Part No.:
- AH3231Q-P-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH3231Q-P-B.pdf
- Description:
- Hall Unipolar Switch SIP-3 BULK
- Quantity:
- Payment:
- Shipping:
Inventory:975
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Product details
Overview
AH3231Q-P-B from Diodes Incorporated is an AEC-Q100 qualified, two-wire automotive Hall-effect unipolar switch IC in SIP-3 package, featuring inverted output polarity, 65–120 G operating point (BOP), -40°C to +150°C operating range, and 2.7V–27V supply voltage - deployed in seatbelt buckle detection and door/trunk closure sensing.
For engineers reviewing the AH3231Q-P-B datasheet, AH3231Q-P-B pinout, AH3231Q-P-B application, or AH3231Q-P-B equivalent, key selection criteria include magnetic sensitivity stability over temperature, reverse-polarity protection, thermal shutdown behavior, and compatibility with high-side or low-side sensing topologies in 12V/24V automotive systems.
Technical Context
The AH3231Q-P-B implements a chopper-stabilized architecture with dynamic offset cancellation and internal bandgap regulation to deliver stable switching thresholds across temperature. Its unipolar latching logic responds exclusively to south-pole magnetic fields, with output held until flux falls below BRP (45–100 G).
It integrates reverse-blocking diode + zener clamp on VDD, UVLO at 2.2–2.7 V, and thermal shutdown at +190°C junction temperature with auto-restart at +180°C - enabling robust operation in harsh under-hood environments without external protection components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V to 27V - supports direct connection to automotive battery rails including cold-crank (6V) and load-dump (27V) transients. |
| Operating Point (BOP) | 65–120 G at +25°C - enables reliable activation with small, low-cost magnets in proximity-sensing applications. |
| Release Point (BRP) | 45–100 G at +25°C - ensures clean hysteresis margin (≥20 G) to prevent chatter near threshold. |
| Supply Current (Off) | 5–6.9 mA - defines quiescent power draw in standby; critical for always-on vehicle modules. |
| Response Delay Time | 7 μs maximum - supports fast mechanical actuation detection (e.g., seatbelt latch engagement). |
| ESD Rating | HBM = 8 kV, CDM = 1 kV - exceeds ISO 10605 requirements for in-vehicle assembly and handling. |
| Junction Temp Limit | +190°C shutdown / +180°C restart - prevents permanent damage during sustained overheating events. |
Pinout & Package
Package: SIP-3 (Bulk Pack), 3-pin single-inline package with straight leads; footprint compatible with standard through-hole PCB mounting and automated bulk-handling processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Supply input pin - accepts 2.7V–27V; includes integrated reverse-blocking diode and zener clamp. |
| 2 | NC | No-connect terminal - may be left floating, tied to VDD, or grounded per layout constraints; no internal connection. |
| 3 | GND | Ground reference for internal regulator and output current path; must be low-impedance for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Inverted output polarity | Output current turns ON when south pole exceeds BOP - matches fail-safe logic in seatbelt buckle circuits where open-circuit = safe state. |
| Chopper-stabilized architecture | Reduces switch-point drift to <±0.5% over -40°C to +150°C - eliminates need for external calibration in production. |
| Integrated UVLO | 2.2–2.7 V threshold with ≤10 μs reaction time - prevents erratic output during battery brownouts or ignition cycling. |
| Thermal shutdown + auto-restart | Shuts down at +190°C junction temp; resumes operation once Tj drops to +180°C - maintains functionality after transient overheating. |
| Two-wire interface | Single supply line carries both power and output current - reduces wiring harness cost and connector pins in OEM assemblies. |
Applications
| Seatbelt Buckle Detection | Door/Trunk Closure Sensing |
|---|---|
|
Use Scenario: Detecting insertion and secure locking of seatbelt tongue into buckle assembly in passenger and driver seats. IC Role / Device Role / Timing Role: Unipolar Hall switch providing digital presence signal via two-wire current loop; activated by embedded magnet in tongue. Use Value: Inverted output ensures zero-current state when unbuckled - meeting ASIL-B functional safety expectations for occupant restraint monitoring. |
Use Scenario: Confirming full closure of vehicle doors and trunk lids using magnetic actuation near latch mechanisms. IC Role / Device Role / Timing Role: Proximity sensor reporting closed/open status to body control module (BCM) via constant-current sink. Use Value: 27V tolerance and thermal protection enable direct integration into 24V commercial vehicle BCMs without external regulators or TVS. |
| Seat Position Monitoring | Wiper Arm End-Stop Detection |
|
Use Scenario: Tracking fore/aft and recline position of electrically adjustable front seats using multi-magnet arrays. IC Role / Device Role / Timing Role: Discrete position encoder element detecting magnet transitions along linear or rotary travel path. Use Value: 7 μs response time supports real-time feedback for motor control algorithms during active seat adjustment. |
Use Scenario: Identifying park position and end-of-travel for windshield wiper arms in intermittent and automatic modes. IC Role / Device Role / Timing Role: Hall-effect limit switch triggered by cam-mounted magnet at wiper motor housing. Use Value: Wide 2.7–27V operation accommodates variable alternator output during engine start-stop cycles without signal dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unipolar Hall switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3231Q-P-B | Same pinout and magnetic specs but ±100 ppm/°C BOP drift vs. AH3231Q's 0 ppm/°C typical - higher sensitivity variation over temperature. | Limited to cabin applications with <85°C ambient; not rated for under-hood gear selector use. | Select if cost-sensitive and operating within narrower thermal envelope. |
| TLE4913-2G | Three-wire interface (separate VDD, GND, OUT); 3.3V–27V supply; BOP = 5–15 mT - requires additional wiring and pull-up resistor. | Suitable for new designs requiring diagnostic capability (open-load detection) and higher ESD (15 kV HBM). | Choose when system-level diagnostics or enhanced EMC robustness outweigh two-wire simplicity. |
Compared with AL3231Q-P-B, AH3231Q-P-B delivers tighter magnetic threshold stability across temperature; versus TLE4913-2G, it trades diagnostic features for reduced BOM count and wiring complexity in cost-constrained legacy platforms.
Availability
AH3231Q-P-B is available at Aetrix Electronics and suitable for seatbelt buckle detection, door/trunk closure sensing, and wiper end-stop applications requiring stable component supply across automotive production lifecycles.
Supply support for AH3231Q-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 components for automotive, industrial, and computing markets.
AH3231Q-P-B belongs to the AH32xxQ automotive Hall-effect switch family, designed specifically for contactless position and proximity sensing in AEC-Q100-compliant vehicle subsystems.
FAQ
What is the function of Pin 2 (NC) on the AH3231Q-P-B?
Pin 2 is a no-connect terminal with no internal bond wire or circuit connection. It may be left floating, tied to VDD, or grounded based on mechanical or thermal layout requirements - none of these configurations affect electrical performance or magnetic sensitivity.
Does AH3231Q-P-B require an external decoupling capacitor?
Yes - a minimum 100 nF ceramic capacitor must be placed between VDD and GND, located as close as possible to the IC pins. This stabilizes the internal regulator, suppresses supply noise, and ensures reliable switching under EMI-rich automotive conditions.
Can AH3231Q-P-B operate in high-vibration environments like transmission actuators?
Yes - its chopper-stabilized design, integrated thermal protection, and AEC-Q100 qualification (including vibration testing per JESD22-B103) make it suitable for transmission position sensing, though actual deployment requires validation against specific mechanical shock and duty-cycle profiles.
Is AH3231Q-P-B recommended for new designs?
No - Diodes Incorporated explicitly states "NOT RECOMMENDED FOR NEW DESIGNS" in DS41821 Rev. 6. It remains supported for existing production and lifetime buy scenarios, but design-in should consider next-generation alternatives like AH3231Q-W-7 (SC59) or newer family members with extended qualification scope.
AH3231Q-P-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Unipolar Switch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 9mT Trip, 7mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 2.7V ~ 27V
- Current - Supply (Max):
- 6.9mA
- Current - Output (Max):
- -
- Output Type:
- Current Source
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH3231Q-P-B FAQ
1.How can I place an order for AH3231Q-P-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3231Q-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 AH3231Q-P-B reliable?
The price and inventory of AH3231Q-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 AH3231Q-P-B is usually 5 days.
3.What payment methods are accepted for AH3231Q-P-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3231Q-P-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3231Q-P-B?
AH3231Q-P-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3231Q-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 AH3231Q-P-B?
For technical support, including AH3231Q-P-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3231Q-P-B requirements.
6.How does Aetrix verify that AH3231Q-P-B is sourced from the original manufacturer or authorized distributors?
All AH3231Q-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 AH3231Q-P-B meets industry standards.
7.What is the process for return or replacement of AH3231Q-P-B?
All AH3231Q-P-B units undergo pre-shipment inspection (PSI). If there is an issue with AH3231Q-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 AH3231Q-P-B part is unused and in its original packaging.
Return procedure for AH3231Q-P-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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