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Diodes Incorporated AH3329Q-SA-7
- Part No.:
- AH3329Q-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3329Q-SA-7.pdf
- Description:
- HALL UNIPOLAR SWITCH SSOT23 T&R
- Quantity:
- Payment:
- Shipping:
Inventory:2,094
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Product details
Overview
AH3329Q-SA-7 from Diodes Incorporated is an AEC-Q100 Grade 0 qualified high-voltage Hall-effect unipolar switch IC designed for automotive position and proximity sensing. It operates from 3.0V to 28V, features open-drain output with 60mA current limit, BOP of 150–200G (typ. 175G), BRP of 125–180G (typ. 150G), and functions across –40°C to +150°C - deployed in seatbelt buckles, gear position detection, and door/trunk closure systems.
For engineers reviewing the AH3329Q-SA-7 datasheet, AH3329Q-SA-7 pinout, AH3329Q-SA-7 application, or AH3329Q-SA-7 equivalent, key selection criteria include magnetic sensitivity tolerance, SOT23 (Type S) package compatibility, load dump immunity (40V), chopper-stabilized temperature stability, and South-pole activation on the part-marking side - all critical for robust automotive switch design.
Technical Context
The AH3329Q-SA-7 uses a chopper-stabilized architecture with dynamic offset cancellation to suppress thermal drift and mechanical stress effects, delivering ±0.5G/°C typical BOP drift over –40°C to +150°C. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, enabling stable switching thresholds across voltage and temperature extremes.
It implements unipolar switching logic: output pulls low when perpendicular magnetic flux exceeds BOP (175G typ.), remains latched until flux falls below BRP (150G typ.), yielding 25G typical hysteresis. The single open-drain output includes integrated overcurrent limiting (30–55mA) and zener clamping (28V) on both supply and output pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| BOP (Operate Point) | 150–200 G (typ. 175G); defines minimum South-pole field strength required to activate output on SOT23 (Type S) marking side |
| BRP (Release Point) | 125–180 G (typ. 150G); defines maximum residual field before output releases - ensures noise-immune hysteresis |
| VDD Range | 3.0–28 V; supports direct connection to automotive battery rails including cold-crank (3V) and load-dump transients |
| Output Type | Open-drain N-channel MOSFET; requires external pull-up; sinks up to 60mA continuously with internal current limit |
| Operating Temp | –40°C to +150°C; validated per AEC-Q100 Grade 0 for under-hood and cabin-mounted sensing locations |
| ESD Robustness | HBM: 8 kV, CDM: 1 kV; enables handling in non-cleanroom automotive assembly environments |
| Supply Clamp | Zener clamp at 28 V on VDD; withstands 40 V transient (≤100 ms) per absolute max rating - protects against ISO 7637-2 pulse 5a |
Pinout & Package
Package: SOT23 (Type S), 3-pin surface-mount, lead-free and RoHS-compliant, with part marking on top surface. Pin 1 (VDD) located at top-left corner when notch or mark is oriented upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power supply input; accepts 3.0–28V DC; includes reverse-blocking diode and 28V zener clamp |
| 2 | GND | Ground reference for internal regulator and output stage; must be low-impedance path to minimize noise coupling |
| 3 | OUTPUT | Open-drain output; sinks current when active (B > BOP); includes 30–55mA current limit and 28V zener clamp |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized sensing | Reduces thermal drift to <±0.5G/°C and eliminates mechanical stress-induced offset - critical for long-term reliability in plastic housings |
| South-pole activation (marking side) | Enables consistent mounting orientation in space-constrained assemblies like seatbelt latches without polarity ambiguity |
| 40V load dump protection | Withstands ISO 7637-2 Pulse 5a transients up to 40V for ≤100ms - eliminates need for external TVS in many Tier-1 designs |
| Integrated bandgap regulator | Stabilizes internal circuit supply across VDD range and temperature - ensures consistent BOP/BRP performance from 3V to 28V |
| AEC-Q100 Grade 0 qualification | Validated for operation up to +150°C ambient - certified for engine bay, transmission, and HVAC actuator placement |
Applications
| Seatbelt Buckle Detection | Gear Position Sensing |
|---|---|
|
Use Scenario: Detect buckle insertion/removal in automotive seating systems using a magnet embedded in the tongue and AH3329Q-SA-7 mounted on the receptacle housing. IC Role / Device Role / Timing Role: Unipolar Hall switch providing latched ON/OFF status signal to body control module (BCM) via open-drain interface. Use Value: 175G BOP ensures reliable actuation with small, low-cost magnets; 150°C rating allows placement near heated seat electronics. |
Use Scenario: Monitor physical gear lever position in automatic transmission shifters by detecting magnet movement across discrete detent positions. IC Role / Device Role / Timing Role: Magnetic threshold detector converting mechanical position into digital state signal for transmission control unit (TCU). Use Value: 25G hysteresis prevents chatter during gear transitions; 3–28V operation interfaces directly with 12V vehicle bus without regulation. |
| Door/Trunk Closure Monitoring | Steering Column Lock Activation |
|
Use Scenario: Confirm full closure of doors or trunk lids using a magnet on the moving panel and AH3329Q-SA-7 on the fixed frame. IC Role / Device Role / Timing Role: Proximity sensor generating wake-up or status signal to door module upon magnetic field change. Use Value: 8kV HBM ESD rating survives repeated handling during vehicle assembly; SIP-3/SOT23 footprint enables compact PCB layout in tight door modules. |
Use Scenario: Enable/disable steering column immobilizer lock by detecting rotation of a coded magnet ring during ignition key insertion. IC Role / Device Role / Timing Role: Security-critical position verifier feeding authenticated state to immobilizer control unit (IMMO). Use Value: AEC-Q100 Grade 0 qualification ensures functional safety compliance; reverse-blocking diode prevents backfeed during battery disconnect events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect unipolar switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3329Q-SA-7 | Same BOP/BRP specs and SOT23 (Type S) package, but manufactured by Allegro; lacks AEC-Q100 Grade 0 certification - rated Grade 1 (–40°C to +125°C) | Not suitable for under-hood or transmission-adjacent locations requiring +150°C operation | Select only if operating ambient stays ≤+125°C and PPAP documentation is not required. |
| TLE4913-2SA | Infineon device with 180–220G BOP range; requires external RC filter for EMI suppression; no integrated zener clamp on VDD | Needs external 33V TVS for load dump protection; higher BOP increases magnet size/cost in low-field applications | Prefer when legacy Infineon ecosystem integration or specific ASIL-B traceability is mandated. |
Compared with AL3329Q-SA-7 and TLE4913-2SA, the AH3329Q-SA-7 delivers verified +150°C operation, integrated 40V transient protection, and production-ready PPAP support - reducing validation effort for new automotive platforms requiring Grade 0 compliance.
Availability
AH3329Q-SA-7 is available at Aetrix Electronics and suitable for automotive seatbelt systems, gear position sensors, and door/trunk closure monitoring requiring stable component supply across extended temperature and voltage ranges.
Supply support for AH3329Q-SA-7 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 integrated circuits, specializing in high-reliability power management, signal integrity, and sensing solutions for automotive and industrial markets.
The AH332XQ series belongs to Diodes' automotive Hall-effect sensor product line, engineered specifically for contactless position and proximity detection in harsh environments - emphasizing AEC-Q100 compliance, chopper stabilization, and system-level protection integration.
FAQ
What magnetic polarity activates the AH3329Q-SA-7 in its SOT23 (Type S) package?
The AH3329Q-SA-7 requires a South pole applied to the part-marking side of the SOT23 (Type S) package to activate. This is explicitly defined in the datasheet's magnetic characteristics table and confirmed by the pin 1 orientation diagram. Applying North pole or South pole to the opposite side will not trigger switching behavior.
Does the AH3329Q-SA-7 require an external pull-up resistor on the OUTPUT pin?
Yes - the OUTPUT pin is an open-drain N-channel MOSFET and must be pulled up externally to VDD or another logic-compatible voltage. A typical value is 1–10kΩ; lower values improve rise time but increase quiescent current. The datasheet recommends RL = 1kΩ for timing characterization (tR/tF).
Can the AH3329Q-SA-7 operate reliably at 28V continuous supply voltage?
Yes - 28V is within the recommended operating range (3.0V to 28V). At 28V and +150°C ambient, power dissipation in the SOT23 (Type S) package is limited to ~92mW (per thermal curve on page 7), well within its 230mW rating at 25°C. Derating is handled automatically by the thermal performance curve.
Is the AH3329Q-SA-7 pin-compatible with other AH332XQ variants in SOT23 (Type S) packaging?
Yes - all AH332XQ variants (e.g., AH3322Q-SA-7 through AH3321Q-SA-7) share identical SOT23 (Type S) pinout (VDD-GND-OUTPUT), same footprint, and identical electrical interface. Only magnetic thresholds (BOP/BRP) differ between part numbers; no layout or schematic changes are needed when substituting within the family.
AH3329Q-SA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Unipolar Switch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 20mT Trip, 12.5mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 3V ~ 28V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 60mA
- Output Type:
- Open Drain
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AH3329Q-SA-7 FAQ
1.How can I place an order for AH3329Q-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3329Q-SA-7 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 AH3329Q-SA-7 reliable?
The price and inventory of AH3329Q-SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3329Q-SA-7 is usually 5 days.
3.What payment methods are accepted for AH3329Q-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3329Q-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3329Q-SA-7?
AH3329Q-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3329Q-SA-7 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 AH3329Q-SA-7?
For technical support, including AH3329Q-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3329Q-SA-7 requirements.
6.How does Aetrix verify that AH3329Q-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH3329Q-SA-7 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 AH3329Q-SA-7 meets industry standards.
7.What is the process for return or replacement of AH3329Q-SA-7?
All AH3329Q-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3329Q-SA-7, 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 AH3329Q-SA-7 part is unused and in its original packaging.
Return procedure for AH3329Q-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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