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Diodes Incorporated AH3271Q-W-7
- Part No.:
- AH3271Q-W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3271Q-W-7.pdf
- Description:
- MAG SWITCH LATCH SC59 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:3,987
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Product details
Overview
AH3271Q-W-7 from Diodes Incorporated is an AEC-Q100 qualified two-wire automotive Hall-effect latch switch IC in SC59 (Type A1) package, designed for magnetic position sensing in harsh environments. It operates from 2.7V to 27V, features BOP = 8–28 G and BRP = –28 to –8 G at +25°C, delivers 6 mA off-state supply current (IOFF), and supports –40°C to +150°C ambient operation in seatbelt buckle and gear position detection.
For engineers reviewing the AH3271Q-W-7 datasheet, AH3271Q-W-7 pinout, AH3271Q-W-7 application, or AH3271Q-W-7 equivalent, key selection criteria include latch-mode magnetic hysteresis, two-wire current-sourcing output architecture, thermal shutdown threshold at +190°C, and compatibility with high-voltage automotive battery rails up to 27V.
Technical Context
The AH3271Q-W-7 implements a chopper-stabilized Hall sensor with dynamic offset cancellation and internal bandgap-regulated supply, enabling stable switching across temperature without external compensation. Its latch behavior requires magnetic polarity reversal-south pole activation followed by north pole release-to toggle output state.
It integrates reverse-polarity protection via built-in blocking diode and zener clamp, UVLO at 2.2–2.7 V, and auto-restart thermal shutdown triggered at TJ = +190°C. The device draws only 6 mA in off-state and 12–17 mA when active, supporting low-power two-wire loop configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 27 V - enables direct connection to automotive battery rail without external regulation |
| Operating Temperature | –40°C to +150°C - qualified for under-hood and cabin-mounted automotive sensing locations |
| BOP / BRP (25°C) | 8–28 G / –28 to –8 G - defines magnetic hysteresis window for reliable latch toggling in noisy environments |
| IOFF (Off-State Current) | 5–6.9 mA - sets minimum loop current for two-wire current-source output compliance |
| Thermal Shutdown Threshold | +190°C junction - protects against sustained overtemperature in enclosed assemblies |
| ESD Rating (HBM/CDM) | 8 kV / 1 kV - ensures robustness during handling and system integration in production lines |
| Response Delay Time | 7 μs - supports real-time detection of fast-moving mechanical targets (e.g., gear teeth) |
Pinout & Package
SC59 (Type A1) surface-mount package with 3-pin single-inline configuration; thermally optimized for PCB mounting on 2 oz copper layers (RθJA = 268°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Supply voltage input | Accepts 2.7–27 V DC; includes integrated reverse-blocking diode and zener clamp |
| 2 - NC | No-connect terminal | Internally unconnected; may be tied to VDD, GND, or left floating per layout requirements |
| 3 - GND | Ground reference | Return path for supply current and internal regulator; must be low-impedance for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized Hall element | Eliminates offset drift over temperature and stress, ensuring ±3.3 μs jitter in 1 kHz switching |
| Two-wire latch output | Current-source output holds state until magnetic polarity reversal-ideal for gear position feedback |
| Integrated UVLO | Prevents erratic switching below 2.2 V, with 10 μs reaction time for clean power-up sequencing |
| Auto-restart thermal protection | Shuts down at +190°C junction and resumes operation once TJ drops below +180°C |
| AEC-Q100 Grade 0 qualification | Validated for automotive applications requiring –40°C to +150°C operation and PPAP compliance |
Applications
| Seatbelt Buckle Detection | Gear Position Sensing |
|---|---|
Use Scenario: Detect buckle insertion/removal in driver/passenger seats using embedded magnet and fixed sensor placement. IC Role / Device Role / Timing Role: Latch switch provides persistent ON/OFF state indicating buckle status without continuous polling. Use Value: Eliminates need for microcontroller wake-up interrupts; reduces system power by >90% vs. active-sensing alternatives. |
Use Scenario: Monitor rotational position of manual transmission shift lever via magnet mounted on linkage. IC Role / Device Role / Timing Role: Two-wire latch output directly interfaces with body control module (BCM) current-loop inputs. Use Value: Enables fail-safe position reporting even during battery voltage sag below 5 V due to wide 2.7–27 V operating range. |
| Door/Trunk Closure Monitoring | Wiper Arm Position Feedback |
Use Scenario: Confirm full closure of vehicle doors or trunk lid using magnet-on-latch and sensor-on-frame mounting. IC Role / Device Role / Timing Role: Provides latched signal indicating closed state until door is opened (magnetic field removed and reversed). Use Value: Supports automatic interior light deactivation and alarm arming without additional debouncing circuitry. |
Use Scenario: Track wiper blade park position at bottom of stroke using cam-actuated magnet near motor housing. IC Role / Device Role / Timing Role: Delivers precise edge-triggered output synchronized to mechanical motion, not voltage timing. Use Value: Enables accurate park positioning within ±1° mechanical tolerance, independent of motor speed variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3270Q-W-7 | Lower IOFF (3.3 mA vs. 6 mA); identical BOP/BRP and package | Better suited for ultra-low-power loops where <4 mA quiescent current is mandatory | Select when minimizing total loop current dominates over output drive strength |
| AH3272Q-W-7 | Wider BOP/BRP range (15–45 G / –45 to –15 G); same IOFF and thermal specs | Designed for larger air gaps or weaker magnets, e.g., in transmission housings with thick metal shielding | Choose when sensing distance exceeds 3 mm or magnet strength is reduced by ferrous interference |
Compared with AH3270Q-W-7 and AH3272Q-W-7, the AH3271Q-W-7 balances mid-range magnetic sensitivity and moderate off-state current-making it optimal for general-purpose automotive latch sensing where magnet strength and PCB space are constrained but power budget allows ~6 mA standby.
Availability
AH3271Q-W-7 is available at Aetrix Electronics and suitable for seatbelt buckle detection, gear position sensing, and door/trunk closure monitoring requiring stable component supply across automotive production lifecycles.
Supply support for AH3271Q-W-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 analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.
The AH32xxQ series belongs to Diodes' automotive Hall-effect sensor product line, engineered specifically for contactless position and proximity sensing in AEC-Q100-compliant systems with extended temperature and voltage requirements.
FAQ
What is the magnetic polarity requirement for AH3271Q-W-7 actuation?
The AH3271Q-W-7 is activated by a south pole magnetic field exceeding BOP (8–28 G), and releases only when the field reverses polarity and falls below BRP (–28 to –8 G). This latch behavior requires both field presence and polarity reversal-north pole exposure is essential for state reset, unlike unipolar switches.
Can AH3271Q-W-7 operate reliably at 27 V supply without external protection?
Yes. The device integrates a zener clamp and reverse-blocking diode rated for ±32 V absolute maximum, allowing direct connection to 24 V automotive systems-even during load-dump transients up to 32 V. No external TVS or reverse-protection diode is required in standard implementations.
How does the two-wire configuration affect wiring and load design?
The AH3271Q-W-7 uses a current-source output: VDD and GND form the loop, with load (e.g., BCM input resistor) placed between VDD and the vehicle's switched ground. Typical RL is 100 Ω; higher values reduce current but increase susceptibility to EMI-decoupling capacitor (≥100 nF) must be placed adjacent to VDD/GND pins.
Is AH3271Q-W-7 pin-compatible with other AH327xQ variants?
Yes. All AH327xQ devices-including AH3270Q, AH3271Q, and AH3272Q-share identical SC59 (Type A1) and SIP-3 pinouts, electrical footprints, and thermal characteristics. Magnetic thresholds and off-state current differ, but PCB layout and interface circuitry remain fully interchangeable.
AH3271Q-W-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:
- Latch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 1.8mT Trip, -1.8mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 2.7V ~ 27V
- Current - Supply (Max):
- -
- Current - Output (Max):
- -
- Output Type:
- Latch
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH3271Q-W-7 FAQ
1.How can I place an order for AH3271Q-W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3271Q-W-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 AH3271Q-W-7 reliable?
The price and inventory of AH3271Q-W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3271Q-W-7 is usually 5 days.
3.What payment methods are accepted for AH3271Q-W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3271Q-W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3271Q-W-7?
AH3271Q-W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3271Q-W-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 AH3271Q-W-7?
For technical support, including AH3271Q-W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3271Q-W-7 requirements.
6.How does Aetrix verify that AH3271Q-W-7 is sourced from the original manufacturer or authorized distributors?
All AH3271Q-W-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 AH3271Q-W-7 meets industry standards.
7.What is the process for return or replacement of AH3271Q-W-7?
All AH3271Q-W-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3271Q-W-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 AH3271Q-W-7 part is unused and in its original packaging.
Return procedure for AH3271Q-W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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