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Diodes Incorporated AH3724Q-SA-7
- Part No.:
- AH3724Q-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3724Q-SA-7.pdf
- Description:
- HALL LATCH SWITCH SSOT23 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:4,402
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Product details
Overview
AH3724Q-SA-7 from Diodes Incorporated is an AEC-Q100 Grade 0 qualified high-voltage bipolar Hall-effect latch IC designed for automotive brushless DC motor commutation and angular position sensing. It operates from 3.0V to 28V, features BOP/BRP of 20–60G / –60G to –20G (typ), and delivers open-drain output with 30–55mA current limit across –40°C to +150°C ambient.
For engineers reviewing the AH3724Q-SA-7 datasheet, AH3724Q-SA-7 pinout, AH3724Q-SA-7 application, or AH3724Q-SA-7 equivalent, key selection criteria include magnetic sensitivity hysteresis (40–120G), chopper-stabilized temperature stability, reverse supply protection (–18V), and SC59/SOT23/SIP-3 package polarity orientation dependency.
Technical Context
The AH3724Q-SA-7 uses a chopper-stabilized architecture with dynamic offset cancellation to minimize switch-point drift over temperature and supply voltage. Its internal bandgap regulator provides temperature-compensated biasing for analog circuitry, enabling stable operation across the full –40°C to +150°C range.
Magnetic actuation follows bipolar latch behavior: South pole applied to the marked side (SOT23/SIP-3) or unmarked side (SC59) switches output low; North pole reversal releases it. Hysteresis (BHY = |BOP| – |BRP|) is 40–120G, ensuring noise-immune state retention in EMI-prone automotive environments.
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 |
| Operating Temperature | –40°C to +150°C - qualified for under-hood and transmission-mounted applications |
| BOP / BRP (typ) | 40G / –40G - enables reliable detection of moderate-strength magnets at extended air gaps |
| Hysteresis (BHY) | 40–120G - prevents chatter during slow or noisy magnetic transitions |
| Output Type | Open-drain with 30–55mA current limit - compatible with standard pull-up resistors and tolerant of short-circuit faults |
| ESD Robustness | HBM 8kV, CDM 1kV - meets stringent automotive ESD immunity requirements |
| Startup Time | 10µs typical - ensures rapid system readiness after power-on reset |
Pinout & Package
Package: SC59 (JEDEC TO-92 variant), SOT23 (Type S), and SIP-3 (Ammo/Bulk Pack) - all lead-free, RoHS- and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power input with integrated reverse-blocking diode and zener clamp (–18V reverse, 28V clamp) |
| 2 | GND | Reference ground for internal regulator and output stage; requires low-impedance PCB return path |
| 3 | OUTPUT | Open-drain NMOS output with overcurrent limiting; sinks up to 55mA and clamps at VOUT_ON ≤ 0.4V @ 20mA |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar Latch Operation | South pole activates, North pole deactivates - eliminates need for external polarity control logic in BLDC rotor position feedback |
| Chopper Stabilization | 500kHz chopping frequency - reduces thermal drift of BOP/BRP to <±0.5G/°C and improves long-term reliability |
| Magnetic Polarity Mapping | SOT23/SIP-3: South to marking side; SC59: South to non-marking side - enables mechanical design flexibility across package variants |
| Integrated Protection | Reverse supply diode + zener clamp on VDD, plus output zener clamp and current limit - removes need for discrete protection components |
| AEC-Q100 Grade 0 | Qualified to +150°C junction temperature - certified for safety-critical engine, transmission, and EPS applications |
Applications
| BLDC Motor Commutation | RPM Measurement |
|---|---|
Use Scenario: Detecting rotor magnet position in 12V/24V automotive fan, pump, or HVAC blower motors. IC Role / Device Role / Timing Role: Provides digital commutation timing edges synchronized to magnet passage; latched output holds state between poles. Use Value: Enables precise 6-step trapezoidal drive with <10µs propagation delay and no external hysteresis components. |
Use Scenario: Measuring rotational speed of crankshaft, camshaft, or wheel speed sensors in ABS or engine management. IC Role / Device Role / Timing Role: Generates clean, jitter-free pulse train proportional to shaft RPM; open-drain output interfaces directly to microcontroller input pins. Use Value: Delivers consistent edge timing across –40°C to +150°C with <4µs magnetic-to-output delay and >8kV ESD immunity. |
| Angular Position Sensing | Flow Meter Detection |
Use Scenario: Monitoring throttle valve or steering angle via rotating magnet coupled to potentiometer or gear. IC Role / Device Role / Timing Role: Acts as contactless angular index detector; latched output indicates quadrant or detent position. Use Value: Eliminates mechanical wear and contact bounce; 40–120G hysteresis prevents false triggers from vibration-induced flux oscillation. |
Use Scenario: Detecting turbine rotation in automotive fuel or coolant flow meters using embedded permanent magnets. IC Role / Device Role / Timing Role: Converts magnet rotation into digital pulse stream; output drives counter or timer peripherals. Use Value: Operates reliably at 28V transients and withstands reverse battery conditions common in flow meter harnesses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bipolar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3724Q-13 | Same BOP/BRP specs and SC59 package, but rated AEC-Q100 Grade 1 (–40°C to +125°C) | Not suitable for under-hood locations exceeding +125°C ambient | Select when cost-sensitive designs operate within Grade 1 temperature envelope and do not require Grade 0 validation. |
| TLE4961-2M | Higher BOP/BRP (±50G typ), integrated pull-up, but no reverse supply protection or zener clamp | Requires external reverse-polarity protection and may need additional ESD hardening | Choose where higher magnetic sensitivity is prioritized and board space allows discrete protection components. |
Compared with AL3724Q-13, AH3724Q-SA-7 extends operational margin to +150°C and includes integrated reverse-battery tolerance; versus TLE4961-2M, it trades sensitivity for robustness-reducing BOM count in harsh automotive environments where protection integration is critical.
Availability
AH3724Q-SA-7 is available at Aetrix Electronics and suitable for automotive BLDC motor control, RPM sensing, angular position feedback, and flow metering requiring stable component supply across extended temperature and voltage ranges.
Supply support for AH3724Q-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets.
The AH372XQ series targets high-reliability automotive sensing, delivering AEC-Q100 Grade 0 Hall latches optimized for brushless motor commutation and position feedback in thermally demanding environments.
FAQ
What is the magnetic polarity orientation requirement for AH3724Q-SA-7 in SC59 package?
The SC59 package requires the South pole to be applied to the non-part-marking side to activate the output. This is opposite to SOT23 and SIP-3 variants, which require South pole on the part-marking side. The functional block diagram and pin view diagrams in DS46144 Rev. 3–2 confirm this orientation dependency per package type.
Does AH3724Q-SA-7 require an external bypass capacitor?
Yes - a 10nF to 100nF ceramic capacitor (CIN) is required between VDD and GND to stabilize the internal regulator and improve RF noise immunity. The datasheet specifies this in the Typical Applications Circuit and notes its role in strengthening noise immunity under transient conditions.
Can AH3724Q-SA-7 operate with a 3.3V microcontroller I/O rail?
No - AH3724Q-SA-7 has an open-drain output that must be pulled up to a voltage compatible with its VDD supply (3.0V–28V). Direct interfacing to a 3.3V I/O rail is unsafe if VDD exceeds 3.3V; a level-shifting pull-up or voltage translator is required to avoid damaging the MCU input.
What is the maximum continuous output current rating?
The continuous output current is rated at 60mA absolute maximum, but the device limits current to 30–55mA (typ) under overload conditions. This IOCL specification is guaranteed across temperature and supply voltage, providing inherent short-circuit protection without external current-limiting resistors.
AH3724Q-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:
- Latch, Bipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±6mT Trip, ±0.5mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 2.2V ~ 20V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 25mA
- Output Type:
- Digital
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AH3724Q-SA-7 FAQ
1.How can I place an order for AH3724Q-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3724Q-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 AH3724Q-SA-7 reliable?
The price and inventory of AH3724Q-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 AH3724Q-SA-7 is usually 5 days.
3.What payment methods are accepted for AH3724Q-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3724Q-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3724Q-SA-7?
AH3724Q-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3724Q-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 AH3724Q-SA-7?
For technical support, including AH3724Q-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3724Q-SA-7 requirements.
6.How does Aetrix verify that AH3724Q-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH3724Q-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 AH3724Q-SA-7 meets industry standards.
7.What is the process for return or replacement of AH3724Q-SA-7?
All AH3724Q-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3724Q-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 AH3724Q-SA-7 part is unused and in its original packaging.
Return procedure for AH3724Q-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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