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Diodes Incorporated AH3523Q-SA-7
- Part No.:
- AH3523Q-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3523Q-SA-7.pdf
- Description:
- HALL OMNIPOLAR SWITCH SSOT23 T&R
- Quantity:
- Payment:
- Shipping:
Inventory:4,272
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Product details
Overview
AH3523Q-SA-7 from Diodes Incorporated is an AEC-Q100 Grade 0 qualified automotive Hall-effect omnipolar switch IC in SOT23 (Type S) package, designed for contactless position and proximity sensing in harsh environments. It operates from 3.0V to 28V, features ±30G typical operate point (BOP), 10µs startup time, open-drain output with 30–55mA current limit, and supports seatbelt buckle detection and gear position sensing.
For engineers reviewing the AH3523Q-SA-7 datasheet, AH3523Q-SA-7 pinout, AH3523Q-SA-7 application, or AH3523Q-SA-7 equivalent, key selection criteria include magnetic sensitivity range (±15G to ±45G), load dump protection (40V), chopper-stabilized temperature stability (−40°C to +150°C), and SIP-3/SOT23 package compatibility for space-constrained automotive modules.
Technical Context
The AH3523Q employs chopper-stabilized architecture with dynamic offset cancellation to minimize thermal drift of magnetic thresholds-ensuring BOP/BRP stability across −40°C to +150°C. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, while the single open-drain output integrates overcurrent limiting and Zener clamping on both VDD and OUTPUT pins.
It functions as a bipolar-triggered, hysteresis-based digital switch: output turns ON (low) when |B| exceeds BOP (±15G to ±45G), remains ON until |B| falls below BRP (±5G to ±35G), delivering 10µs typical response delay and <0.4V saturation voltage at 20mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - supports direct battery connection in 12V/24V automotive systems without external regulation. |
| Operate Point (BOP) | ±15G to ±45G typ - enables reliable actuation with small magnets at air gaps up to 3.5mm in seatbelt or door latch assemblies. |
| Release Point (BRP) | ±5G to ±35G typ - provides 5G–18G hysteresis to prevent chatter near threshold in vibration-prone vehicle cabins. |
| Output Saturation Voltage | 0.2V–0.4V @ 20mA - ensures low power dissipation and clean logic-low signaling into standard pull-up resistors. |
| Startup Time | 10µs typ - guarantees rapid system readiness after ignition power-up, critical for transmission position feedback. |
| ESD Robustness | HBM 8kV / CDM 1kV - meets automotive assembly line ESD requirements without additional protection circuitry. |
| Load Dump Protection | 40V transient rating - withstands ISO 7637-2 Pulse 5a without damage during alternator load dump events. |
Pinout & Package
SOT23 (Type S) surface-mount package: 3-pin, lead-free, matte tin-plated terminals, moisture sensitivity level 1 per J-STD-020, footprint compatible with standard SOT23 land patterns (C=1.83mm, G=0.80mm, X1=2.53mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Power supply input | Accepts 3.0–28V DC; includes reverse-blocking diode and 28V Zener clamp for fault tolerance. |
| 2 - GND | Ground reference | Common return path for internal regulator, Hall sensor, and output driver; requires low-impedance PCB plane. |
| 3 - OUTPUT | Open-drain output | Switches low when B > BOP; rated for 60mA continuous, 30–55mA current-limited, with 32V off-state Zener clamp. |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar magnetic sensing | Detects either north or south pole - eliminates magnet orientation dependency in HVAC damper or wiper linkage mounts. |
| Chopper-stabilized core | Reduces thermal drift of BOP/BRP to ±0.5G/°C - maintains consistent switching points across cabin temperature extremes. |
| Integrated protection | Reverse-blocking diode + dual Zener clamps (VDD & OUTPUT) - removes need for external TVS or polarity protection in body control modules. |
| High ESD immunity | 8kV HBM - survives handling and assembly without board-level ESD suppressors in seat electronics subassemblies. |
| AEC-Q100 Grade 0 | Qualified for −40°C to +150°C operation - certified for engine bay, transmission, and under-hood applications. |
Applications
| Seatbelt Buckle Detection | Gear Position Sensing |
|---|---|
|
Use Scenario: Detect buckle insertion/removal in driver/passenger seats to enable airbag suppression and occupancy classification. IC Role / Device Role / Timing Role: Omnipolar Hall switch providing robust, contactless status signal with hysteresis to reject mechanical vibration noise. Use Value: Eliminates microswitch wear and corrosion; operates reliably at 150°C ambient near heated seat elements. |
Use Scenario: Monitor P/R/N/D gear selector position in automatic transmissions for shift control and dashboard display. IC Role / Device Role / Timing Role: Magnetic position sensor interfacing with rotating ferrous target or multi-pole magnet on gear shaft. Use Value: Delivers 10µs response and 40V load dump tolerance-critical for real-time CAN bus transmission control signals. |
| Door/Trunk Closure Monitoring | HVAC Damper Actuation |
|
Use Scenario: Confirm full closure of doors, liftgates, or hood latches using embedded magnet and fixed Hall sensor. IC Role / Device Role / Timing Role: Proximity switch detecting magnet presence/absence with ±30G sensitivity and 10G hysteresis. Use Value: Enables accurate "door ajar" warning without mechanical switches prone to dust ingress or spring fatigue. |
Use Scenario: Sense rotary damper position in climate control systems to regulate airflow between cabin zones. IC Role / Device Role / Timing Role: Low-power omnipolar switch mounted on HVAC housing, triggered by magnet on damper arm. Use Value: Supports 3V minimum operation-compatible with always-on microcontroller domains for cabin air quality monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect omnipolar switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Melexis US1881EUA-ABA-000-RE | BOP ±25G typ, 5V-only supply, SOIC-8 package, no load dump rating | Limited to low-voltage interior modules (e.g., mirror fold); lacks 28V operation and automotive transients support | Select only for non-under-hood, 5V-sourced designs where SOT23 size and 28V tolerance are unnecessary. |
| Allegro A1174LUA-T | BOP ±35G typ, 3.5–24V range, SOT23, but AEC-Q100 Grade 1 (−40°C to +125°C) only | Not qualified for engine bay or transmission use due to lower max junction temperature (125°C vs. 150°C) | Acceptable for door modules or seat controls outside high-temp zones; verify thermal derating in enclosure simulation. |
Compared with US1881EUA-ABA-000-RE and A1174LUA-T, the AH3523Q-SA-7 uniquely combines SOT23 footprint, 28V operation, 40V load dump rating, and AEC-Q100 Grade 0 qualification-making it the only choice for space-constrained, high-temp, high-voltage automotive sensing nodes requiring zero second-source risk.
Availability
AH3523Q-SA-7 is available at Aetrix Electronics and suitable for seatbelt buckle detection, gear position sensing, door/trunk closure monitoring, and HVAC damper actuation requiring stable component supply across automotive production lifecycles.
Supply support for AH3523Q-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and computing markets, with IATF 16949-certified manufacturing.
The AH352XQ series belongs to Diodes' automotive Hall-effect sensor product line, engineered specifically for robust, high-temperature, high-voltage position sensing in safety-critical vehicle subsystems.
FAQ
What is the magnetic sensitivity range of AH3523Q-SA-7, and how does it impact design?
The AH3523Q-SA-7 has a typical operate point (BOP) of ±30G, with min/max range ±15G to ±45G, and release point (BRP) of ±20G, with hysteresis of 5G–18G. This wide sensitivity window allows flexible magnet sizing and air-gap design-enabling use of low-cost ferrite magnets at 2–3.5mm gaps in seatbelt or door latch mechanisms without recalibration across temperature.
Does AH3523Q-SA-7 require an external pull-up resistor, and what value is recommended?
Yes, the open-drain OUTPUT pin requires an external pull-up resistor to VDD. Diodes recommends RL = 1kΩ to 10kΩ depending on rise time and bus loading; 4.7kΩ is optimal for 12V systems with ≤100pF trace capacitance, achieving <1µs rise time while minimizing quiescent current draw.
Can AH3523Q-SA-7 be used in 48V mild-hybrid architectures?
No-AH3523Q-SA-7 is rated for 3.0V–28V operating voltage and 40V absolute maximum transient (ISO 7637-2 Pulse 5a). It is not rated for sustained 48V rail operation or 60V+ transients in 48V systems. For mild-hybrid applications, Diodes' AH357xQ series (48V-rated) is the designated alternative.
How does the chopper-stabilized architecture improve performance over conventional Hall switches?
Chopper stabilization dynamically cancels offset voltage drift in the Hall element and amplifier chain, reducing BOP/BRP thermal drift to <0.5G/°C. This enables stable switching behavior from −40°C to +150°C without calibration-critical for gear position sensors exposed to engine heat and cold-soak conditions.
AH3523Q-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:
- Omnipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±4.5mT Trip, ±0.5mT Release
- Test Condition:
- -40°C ~ 150°C
- Voltage - Supply:
- 3V ~ 28V
- Current - Supply (Max):
- 3mA
- Current - Output (Max):
- 30mA
- Output Type:
- Open Drain
- Features:
- -
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AH3523Q-SA-7 FAQ
1.How can I place an order for AH3523Q-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3523Q-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 AH3523Q-SA-7 reliable?
The price and inventory of AH3523Q-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 AH3523Q-SA-7 is usually 5 days.
3.What payment methods are accepted for AH3523Q-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3523Q-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3523Q-SA-7?
AH3523Q-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3523Q-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 AH3523Q-SA-7?
For technical support, including AH3523Q-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3523Q-SA-7 requirements.
6.How does Aetrix verify that AH3523Q-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH3523Q-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 AH3523Q-SA-7 meets industry standards.
7.What is the process for return or replacement of AH3523Q-SA-7?
All AH3523Q-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3523Q-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 AH3523Q-SA-7 part is unused and in its original packaging.
Return procedure for AH3523Q-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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