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Diodes Incorporated AH3231Q-P-A
- Part No.:
- AH3231Q-P-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH3231Q-P-A.pdf
- Description:
- Hall Unipolar Switch SIP-3 AMMO
- Quantity:
- Payment:
- Shipping:
Inventory:3,987
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Product details
Overview
AH3231Q-P-A 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 temperature, and 2.7V–27V supply range. It functions as a magnetic proximity sensor for seatbelt buckle detection, delivering robust switching with chopper-stabilized architecture and built-in thermal shutdown.
For engineers reviewing the AH3231Q-P-A datasheet, AH3231Q-P-A pinout, AH3231Q-P-A application, or AH3231Q-P-A equivalent, key selection criteria include its unipolar latch-free switching behavior, inverted current-sink output, wide voltage tolerance, automotive-grade ESD rating (8 kV HBM), and SIP-3 mechanical compatibility with high-vibration environments.
Technical Context
The AH3231Q-P-A implements a chopper-stabilized Hall sensor with dynamic offset cancellation and internal bandgap-regulated supply, enabling stable magnetic threshold performance across temperature. Its unipolar switching logic responds only to south-pole magnetic fields exceeding BOP (65–120 G), then holds state until flux drops below BRP (45–100 G).
It operates in two-wire mode with integrated reverse-blocking diode and zener clamp on VDD, supporting direct high-side or low-side sensing configurations. Thermal protection triggers at +190°C junction temperature and auto-restarts when cooling to +180°C, ensuring fault resilience in under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V to 27V - supports direct battery connection without external regulation in 12V/24V automotive systems |
| Operating Point (BOP) | 65–120 G at +25°C - enables reliable activation with small, low-cost magnets near seatbelt latches |
| Release Point (BRP) | 45–100 G at +25°C - ensures clean hysteresis margin to prevent chatter during slow magnetic field decay |
| Supply Current (Off) | 5–6.9 mA - defines quiescent power draw in standby, critical for always-on vehicle modules |
| Output Polarity | Inverted - sinks current when activated, simplifying interface with pull-up microcontroller inputs |
| ESD Rating | HBM = 8 kV, CDM = 1 kV - meets automotive assembly and handling requirements without additional protection circuitry |
| Temperature Range | -40°C to +150°C - validated for placement in cabin, door, or under-dash locations with minimal thermal derating |
Pinout & Package
Package: SIP-3 (Ammo Pack), 3-pin single-inline package with straight leads, optimized for automated insertion and high-vibration mounting in automotive interior modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Supply input with integrated reverse-blocking diode and zener clamp - accepts direct battery connection with ±32V absolute max rating |
| 2 | NC | No-connect terminal - may be tied to VDD, GND, or left floating without affecting operation |
| 3 | GND | Ground reference for internal regulator and output stage - forms return path for switched load current |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized architecture | Reduces switch-point drift to <±3.3 µs jitter over temperature, eliminating manual calibration in production |
| Two-wire operation | Eliminates separate signal wire - reduces harness cost and connector pins in seatbelt or door closure modules |
| Integrated thermal shutdown | Auto-restarts after junction cools from +190°C trip to +180°C release - prevents permanent latch-up during thermal overload |
| UVLO protection | Locks output off below 2.2V VDD - avoids erratic switching during cold-crank or battery recovery events |
| Automotive qualification | AEC-Q100 Grade 0 certified, PPAP-capable, manufactured in IATF 16949 facilities - fulfills Tier 1 OEM sourcing requirements |
Applications
| Seatbelt Buckle Detection | Seat Position Sensing |
|---|---|
Use Scenario: Detecting buckle engagement status in driver/passenger seats using a magnet embedded in the tongue and sensor mounted in the receptacle. IC Role / Device Role / Timing Role: Unipolar Hall switch providing digital presence signal via current-sink output to MCU GPIO. Use Value: Inverted polarity eliminates need for external inverter; wide supply range tolerates battery transients during ignition. | Use Scenario: Monitoring fore-aft or recline position of automotive seats via multiple fixed-position magnets and discrete Hall sensors. IC Role / Device Role / Timing Role: Magnetic proximity detector generating position-state transitions for seat memory or airbag occupancy algorithms. Use Value: 65–120 G BOP allows use of compact ferrite magnets; chopper stabilization ensures consistent trip points across cabin temperature swings. |
| Door Closure Monitoring | Trunk Lid Position Feedback |
Use Scenario: Confirming full closure of front doors by detecting magnet alignment between door frame and striker plate. IC Role / Device Role / Timing Role: Two-wire proximity switch reporting closed/open state to body control module (BCM) via shared power line. Use Value: Built-in reverse-voltage protection (-32 V) prevents damage during jump-start or battery reversal; SIP-3 package withstands door slam vibration. | Use Scenario: Verifying trunk lid latch engagement in liftgate systems using magnet-and-sensor pairing at the locking mechanism. IC Role / Device Role / Timing Role: Fail-safe position indicator interfacing directly with BCM over two-wire bus without signal conditioning. Use Value: 150°C max ambient rating supports under-trunk placement near exhaust or drivetrain heat sources. |
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-A | Same SIP-3 package and pinout; identical BOP/BRP specs but rated to +175°C junction (vs. +165°C) | Targeted for higher-temperature under-hood use; not required for cabin-mounted seatbelt or door applications | Select AH3231Q-P-A for cost-optimized cabin sensing where +150°C ambient suffices |
| US1881LUA-AB3-B | Three-wire operation (VDD, GND, OUT); no internal reverse-protection diode; 3.5–24V supply range | Requires separate signal trace and external protection; less suited for space-constrained two-wire harnesses | Prefer AH3231Q-P-A when minimizing wiring count and enhancing system-level robustness are priorities |
Compared with AL3231Q-P-A, AH3231Q-P-A offers lower cost and sufficient thermal margin for interior applications; versus US1881LUA-AB3-B, it delivers true two-wire simplicity and integrated protection-critical for OEM harness weight and reliability targets.
Availability
AH3231Q-P-A is available at Aetrix Electronics and suitable for seatbelt buckle detection, door closure monitoring, and trunk lid position feedback requiring stable component supply across automotive production lifecycles.
Supply support for AH3231Q-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets.
The AH32xxQ series belongs to Diodes' automotive Hall-effect sensor product line, engineered specifically for contactless position and proximity sensing in harsh, safety-critical vehicle subsystems.
FAQ
What is the output configuration of AH3231Q-P-A?
AH3231Q-P-A features an inverted, current-sink output in two-wire configuration. When activated by a south-pole magnetic field exceeding BOP, it draws current from VDD through the load to GND. No external pull-up resistor is needed-the load itself completes the circuit.
Does AH3231Q-P-A require an external decoupling capacitor?
Yes-a minimum 100 nF ceramic capacitor must be placed between VDD and GND, as close as possible to the SIP-3 pins. This stabilizes the internal regulator, suppresses supply noise, and ensures reliable chopper-stabilized operation in electrically noisy automotive environments.
Can AH3231Q-P-A be used in high-vibration environments like door modules?
Yes. The SIP-3 (Ammo Pack) package has straight leads and mechanical robustness validated for automotive interior applications. Its qualified construction, combined with thermal auto-restart and reverse-voltage protection, makes it suitable for door, seat, and trunk mechanisms subject to repeated mechanical shock.
Is AH3231Q-P-A recommended for new designs?
No-Diodes Incorporated states "THE AH3231Q-AH3234Q/AH3270Q-AH3272Q ARE NOT RECOMMENDED FOR NEW DESIGNS." While fully supported for existing production, new projects should consult Diodes for next-generation alternatives such as the AL32xxQ series with extended junction temperature ratings.
AH3231Q-P-A 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-A FAQ
1.How can I place an order for AH3231Q-P-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3231Q-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 AH3231Q-P-A reliable?
The price and inventory of AH3231Q-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 AH3231Q-P-A is usually 5 days.
3.What payment methods are accepted for AH3231Q-P-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3231Q-P-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3231Q-P-A?
AH3231Q-P-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3231Q-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 AH3231Q-P-A?
For technical support, including AH3231Q-P-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3231Q-P-A requirements.
6.How does Aetrix verify that AH3231Q-P-A is sourced from the original manufacturer or authorized distributors?
All AH3231Q-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 AH3231Q-P-A meets industry standards.
7.What is the process for return or replacement of AH3231Q-P-A?
All AH3231Q-P-A units undergo pre-shipment inspection (PSI). If there is an issue with AH3231Q-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 AH3231Q-P-A part is unused and in its original packaging.
Return procedure for AH3231Q-P-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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