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Diodes Incorporated AH3714Q-SA-7
- Part No.:
- AH3714Q-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- -
- Datasheet:
-
AH3714Q-SA-7.pdf
- Description:
- HALL LATCH SWITCH SSOT23 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,999
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Product details
Overview
AH3714Q-SA-7 from Diodes Incorporated is an AEC-Q100 Grade 0 qualified automotive Hall-effect latch IC in SOT23 (Type S) package, designed for brushless DC motor commutation and angular position sensing. It operates from 3.0V to 27V, features ±40G typical operate/release points (BOP/BRP), open-drain output with 60mA current limit, and chopper-stabilized architecture for stable switching across –40°C to +150°C.
For engineers reviewing the AH3714Q-SA-7 datasheet, AH3714Q-SA-7 pinout, AH3714Q-SA-7 application, or AH3714Q-SA-7 equivalent, key selection criteria include magnetic sensitivity tolerance (±40G typ), load-dump immunity (40V), reverse-battery protection (–18V), and compatibility with South-pole activation on the part-marking side in SOT23 (Type S) configuration.
Technical Context
This bipolar latch uses dynamic offset cancellation and chopper stabilization to achieve minimal switch-point drift (<±0.5G/°C typical) and superior temperature stability over –40°C to +150°C. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, enabling consistent BOP/BRP thresholds across voltage (3.0–27V) and temperature extremes.
The device integrates a reverse-blocking diode and Zener clamp on VDD, plus output Zener clamping and overcurrent limiting (30–60mA). Its single open-drain output switches low when perpendicular magnetic flux exceeds BOP (+40G typ) and remains latched until flux reverses below BRP (–40G typ), with hysteresis of 80G typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 27V - supports direct connection to automotive battery rails including cold-crank (≥3V) and load-dump transients (clamped at 40V) |
| Operating Temperature | –40°C to +150°C - qualified for under-hood and transmission-mounted applications per AEC-Q100 Grade 0 |
| BOP / BRP (Typ) | +40G / –40G - enables reliable detection of moderate-strength magnets at air gaps up to 2.5mm in BLDC rotor position sensing |
| Output Type | Open-drain with 60mA sink capability - interfaces directly with 3.3V/5V/12V microcontrollers via external pull-up; no level-shifting required |
| Startup Time | 13µs typical - ensures rapid system readiness after power-on, critical for engine start-stop and fast-response RPM measurement |
| Magnetic Hysteresis | 80G typical - prevents chatter near threshold in noisy vibration environments such as gearbox speed sensors |
| ESD Robustness | HBM 8kV, CDM 1kV - meets stringent automotive ESD requirements for assembly and field operation |
Pinout & Package
Package: SOT23 (Type S), 3-pin surface-mount, lead-free and RoHS-compliant. Mounting orientation requires South pole applied to part-marking side for activation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Power supply input | Accepts 3.0–27V; includes integrated reverse-blocking diode and 36V Zener clamp for battery reversal and load-dump protection |
| 2 - GND | Ground reference | Low-impedance return path for internal circuitry and output stage; must be connected before VDD during power sequencing |
| 3 - OUTPUT | Open-drain output | Sinks up to 60mA; requires external pull-up resistor (1–10kΩ typical); clamped to 40V max to protect against inductive kickback |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized architecture | Reduces thermal drift of BOP/BRP to <±0.5G/°C, enabling stable commutation timing across full automotive temperature range |
| 40V load-dump protection | Withstands ISO 7637-2 Pulse 5a transients without external TVS, reducing BOM count in motor control modules |
| Reverse-battery immunity | Operates safely with –18V applied to VDD, eliminating need for external reverse-polarity protection diode |
| South-pole activation (SOT23) | Enables intuitive mechanical mounting with magnet on top-side marking surface-no polarity inversion logic required in firmware |
| RF noise immunity | Validated against ISO 11452-2 radiated immunity up to 1000MHz, ensuring robust operation near high-frequency switching inverters |
Applications
| BLDC Motor Commutation | RPM Measurement |
|---|---|
|
Use Scenario: Detecting rotor position in 12V/24V automotive fan, pump, or EPS motors using embedded permanent magnets. IC Role / Device Role / Timing Role: Provides precise edge-aligned commutation signals to gate driver ICs; latching behavior eliminates need for continuous polling. Use Value: Enables >95% motor efficiency by synchronizing phase switching within ±1.5° electrical angle error across –40°C to +150°C. |
Use Scenario: Measuring rotational speed of crankshaft, camshaft, or wheel ABS rings in real time. IC Role / Device Role / Timing Role: Generates clean, jitter-free pulse trains synchronized to magnetic pole transitions; startup time <13µs ensures immediate signal validity post-ignition. Use Value: Delivers ±10RPM accuracy at 10,000 RPM under engine vibration (50g RMS) due to 80G hysteresis and chopper stabilization. |
| Flow Meter Sensing | Angular Position Indexing |
|
Use Scenario: Monitoring fuel, coolant, or brake fluid flow via turbine-mounted magnets in OEM-grade meters. IC Role / Device Role / Timing Role: Converts magnet rotation into digital pulses for microcontroller-based flow calculation; open-drain output drives long traces to remote ECUs. Use Value: Maintains signal integrity over 2m cable runs with 10nF–100nF decoupling, meeting CISPR 25 Class 5 EMC requirements. |
Use Scenario: Detecting gear tooth or notched ring position in transmission shift actuators or throttle bodies. IC Role / Device Role / Timing Role: Acts as zero-reference index sensor; latched output holds state between teeth, simplifying edge-counting firmware logic. Use Value: Eliminates false triggers from mechanical backlash or bearing play due to 80G hysteresis and <1µs output fall time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3714QW-7 | Same sensitivity (±40G), SC59 package; South-pole activation on non-marking side | Requires inverted magnet placement vs. AH3714Q-SA-7; identical electrical specs and AEC-Q100 Grade 0 rating | Select when board layout favors SC59 footprint or when magnet access is from bottom side of PCB |
| TLE4961-2K | Higher BOP (±50G), 5V-only supply, integrated pull-up; no load-dump protection | Lacks 40V transient immunity and wide-voltage operation; requires external protection for 12V/24V systems | Choose only for 5V subsystems where space constraints prohibit external pull-up and protection components |
Compared with AL3714QW-7 and TLE4961-2K, AH3714Q-SA-7 uniquely combines SOT23 compactness, South-pole-on-marking-side activation, 3–27V operation, and integrated 40V load-dump protection-making it optimal for cost-sensitive, space-constrained BLDC commutation in 12V/24V automotive domains.
Availability
AH3714Q-SA-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, RPM measurement, and angular position indexing requiring stable component supply in automotive production programs.
Supply support for AH3714Q-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.
AH3714Q-SA-7 belongs to the AH37xxQ automotive Hall-effect latch family, engineered specifically for high-reliability rotor position and speed sensing in harsh under-hood environments.
FAQ
What is the correct magnet polarity orientation for AH3714Q-SA-7 activation?
For the SOT23 (Type S) package, a South pole must be applied to the part-marking side to turn the output ON. This is confirmed in the datasheet's magnetic polarity diagram and differs from SC59 variants, which require South pole on the non-marking side. Incorrect orientation results in no switching action.
Does AH3714Q-SA-7 require an external decoupling capacitor?
Yes - a 10nF to 100nF ceramic capacitor (CIN) between VDD and GND is mandatory per the datasheet to stabilize the internal regulator and enhance RF noise immunity. Omitting it increases susceptibility to conducted EMI and may cause erratic switching during PWM-rich environments like inverter-driven motors.
Can AH3714Q-SA-7 operate directly from a 24V truck battery without external protection?
Yes - its integrated 40V load-dump clamping and –18V reverse-battery tolerance allow direct connection to 24V systems. However, sustained operation above 27V violates recommended conditions; the 40V rating is a transient stress limit, not a functional operating voltage.
How does the chopper-stabilized design improve performance versus non-chopped Hall latches?
Chopper stabilization reduces offset drift to <±0.5G/°C and minimizes switch-point hysteresis variation across temperature - critical for maintaining precise commutation timing in BLDC motors. Non-chopped devices typically exhibit >2G/°C drift, leading to torque ripple and audible noise above 85°C.
AH3714Q-SA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- -
- Technology:
- -
- Polarization:
- -
- Sensing Range:
- -
- Test Condition:
- -
- Voltage - Supply:
- -
- Current - Supply (Max):
- -
- Current - Output (Max):
- -
- Output Type:
- -
- Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
AH3714Q-SA-7 FAQ
1.How can I place an order for AH3714Q-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3714Q-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 AH3714Q-SA-7 reliable?
The price and inventory of AH3714Q-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 AH3714Q-SA-7 is usually 5 days.
3.What payment methods are accepted for AH3714Q-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3714Q-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3714Q-SA-7?
AH3714Q-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3714Q-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 AH3714Q-SA-7?
For technical support, including AH3714Q-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3714Q-SA-7 requirements.
6.How does Aetrix verify that AH3714Q-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH3714Q-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 AH3714Q-SA-7 meets industry standards.
7.What is the process for return or replacement of AH3714Q-SA-7?
All AH3714Q-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3714Q-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 AH3714Q-SA-7 part is unused and in its original packaging.
Return procedure for AH3714Q-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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