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Diodes Incorporated AH3729Q-SA-7
- Part No.:
- AH3729Q-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3729Q-SA-7.pdf
- Description:
- HALL LATCH SWITCH SSOT23 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:4,570
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Product details
Overview
AH3729Q-SA-7 from Diodes Incorporated is an AEC-Q100 Grade 0 qualified automotive Hall-effect bipolar latch IC designed for high-reliability position and speed sensing in harsh environments. It operates from 3.0V to 28V, features BOP/BRP of 170–250G / –250––170G (typ), 440G hysteresis, and delivers open-drain output switching with <0.4V saturation at 20mA - used in BLDC motor commutation and angular encoders in powertrain and chassis systems.
For engineers reviewing the AH3729Q-SA-7 datasheet, AH3729Q-SA-7 pinout, AH3729Q-SA-7 application, or AH3729Q-SA-7 equivalent, key selection criteria include magnetic sensitivity range, latch polarity configuration per package orientation, supply voltage robustness up to 28V, thermal stability across –40°C to +150°C, and AEC-Q100 qualification for automotive production use.
Technical Context
The AH3729Q-SA-7 implements 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 automotive ambient range.
Magnetic response is defined by bipolar latching behavior: South pole applied to the marked side (SOT23/SIP-3) or unmarked side (SC59) switches output low; reversal to North pole below BRP releases the latch. Hysteresis of 340–500G prevents chatter near threshold transitions.
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 per AEC-Q100 Grade 0. |
| BOP / BRP (typ) | 220G / –220G - high-sensitivity latch optimized for weak-field detection in compact motor or gear-sensing assemblies. |
| Hysteresis (BHY) | 440G (typ) - ensures noise-immune switching in electrically noisy engine compartments and EMI-prone driveline environments. |
| Output Type | Open-drain, 60mA continuous - compatible with standard pull-up resistors and tolerant of bus voltage transients up to 32V. |
| VOUT_ON | 0.4V max @ 20mA - low saturation voltage reduces power loss and enables reliable logic-level interfacing with MCU inputs. |
| Startup Time | 10µs typical - enables fast system wake-up and real-time RPM capture in start-stop and regenerative braking control loops. |
Pinout & Package
Package: SC59 (3-pin surface-mount). Pin assignments are identical across SC59, SOT23 (Type S), and SIP-3 variants per Diodes DS46144 Rev. 3–2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power input with reverse-blocking diode and zener clamp - withstands –18V reverse polarity and 32V transients. |
| 2 | GND | Ground reference for internal regulator and output stage - requires low-impedance PCB return path for EMI suppression. |
| 3 | OUTPUT | Open-drain NMOS output with 30–55mA current limit - sinks load current; requires external pull-up for logic-high state. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper stabilization | Reduces offset drift to <±0.5G/°C - maintains consistent BOP/BRP across temperature without calibration. |
| Integrated protection | Reverse-blocking diode + zener clamp on VDD, plus output overcurrent limit - eliminates need for discrete protection components. |
| RF noise immunity | Validated against ISO 11452-2/4 - operates reliably in proximity to ignition coils, inverters, and DC-DC converters. |
| ESD robustness | 8kV HBM / 1kV CDM - survives handling and assembly in automotive Tier-1 manufacturing lines. |
| Lead-free & green | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb) - compliant with RoHS 3 and IATF 16949 material declarations. |
Applications
| BLDC Motor Commutation | RPM Measurement |
|---|---|
|
Use Scenario: Detecting rotor position in 12V/48V electric power steering (EPS) motors. IC Role / Device Role / Timing Role: Bipolar latch provides edge-aligned commutation signals synchronized to magnet pole transitions. Use Value: 440G hysteresis prevents false triggering during high-vibration steering maneuvers; 28V tolerance accommodates load-dump transients. |
Use Scenario: Measuring crankshaft rotation speed in gasoline direct injection engines. IC Role / Device Role / Timing Role: Latched output delivers clean, jitter-free pulse train to ECU timer capture peripherals. Use Value: 10µs startup time enables immediate RPM reporting after engine cranking; –40°C to +150°C rating covers cold-start to exhaust manifold proximity. |
| Transmission Gear Position Sensing | Electric Brake Caliper Angle Feedback |
|
Use Scenario: Monitoring planetary gearset position in 8-speed automatic transmissions. IC Role / Device Role / Timing Role: Detects ferrous target teeth on rotating gear carrier to determine gear engagement state. Use Value: High 220G BOP allows use with small, low-cost magnets mounted in tight packaging constraints; SC59 footprint minimizes PCB area. |
Use Scenario: Closed-loop angle feedback for electromechanical brake caliper actuation. IC Role / Device Role / Timing Role: Provides latched digital indication of pad wear compensation position via cam-actuated magnet. Use Value: AEC-Q100 Grade 0 qualification ensures functional safety compliance (ASIL-B ready); open-drain output interfaces directly with brake ECU diagnostic monitoring circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Allegro A1220LLHLT-T | Lower sensitivity (BOP = ±35G typ), wider operating range (–40°C to +150°C), same SC59 package. | Optimized for low-field applications like seatbelt tension detection; insufficient for high-air-gap gear sensing. | Select AH3729Q-SA-7 when >170G BOP is required for robust operation with large air gaps or weak magnets. |
| Melexis US1881EUA-ABA-000-SP | Higher hysteresis (500G min), but only AEC-Q100 Grade 1 (–40°C to +125°C), no reverse-voltage protection. | Suitable for cabin modules; not rated for under-hood thermal stress or load-dump survival. | Choose AH3729Q-SA-7 for powertrain locations requiring Grade 0 qualification and integrated reverse-polarity protection. |
Compared with A1220LLHLT-T and US1881EUA-ABA-000-SP, the AH3729Q-SA-7 uniquely combines Grade 0 temperature rating, 28V operational supply, reverse-voltage blocking, and 220G sensitivity - making it the only option qualified for high-reliability, high-field automotive position sensing where field strength and environmental stress coexist.
Availability
AH3729Q-SA-7 is available at Aetrix Electronics and suitable for BLDC motor control, transmission position sensing, electric brake actuation, and crankshaft RPM measurement requiring stable component supply across extended temperature and voltage ranges.
Supply support for AH3729Q-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 computing markets.
The AH372XQ series belongs to Diodes' AEC-Q100-qualified Hall-effect sensor product line, engineered specifically for contactless position and speed sensing in automotive powertrain, chassis, and body control modules.
FAQ
What is the magnetic polarity configuration for AH3729Q-SA-7 in SC59 package?
The AH3729Q-SA-7 in SC59 package requires the South pole to be applied to the non-part-marking side to activate the output (pull low), and North pole to the same side to release it. This is opposite to SOT23/SIP-3 variants, where the South pole must face the part marking side. Polarity orientation is fixed per package type and cannot be reconfigured.
Does AH3729Q-SA-7 require an external capacitor on VDD?
Yes - a 10nF to 100nF ceramic decoupling capacitor (CIN) is required between VDD and GND per the datasheet. It stabilizes the internal bandgap regulator and improves RF noise immunity. Omission causes erratic switching or failure to start up reliably, especially during load-dump events or high-frequency EMI exposure.
Can AH3729Q-SA-7 drive an LED directly?
No - the open-drain output is rated for 60mA continuous sink current, but driving an LED requires current limiting and proper voltage headroom. With a 12V supply and typical red LED (1.8V VF), a 330Ω pull-up yields ~30mA, but VOUT_ON rises to ~0.4V, reducing effective forward voltage. Use a dedicated driver stage for LED indication.
Is AH3729Q-SA-7 pin-compatible with other AH372XQ variants?
Yes - all AH372XQ devices (AH3722Q through AH3729Q) share identical SC59/SOT23/SIP-3 pinouts and electrical interface. Only magnetic thresholds (BOP/BRP) and hysteresis differ. System-level replacement is possible if the new sensitivity range meets the mechanical air gap and magnet strength requirements of the target application.
AH3729Q-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
AH3729Q-SA-7 FAQ
1.How can I place an order for AH3729Q-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3729Q-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 AH3729Q-SA-7 reliable?
The price and inventory of AH3729Q-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 AH3729Q-SA-7 is usually 5 days.
3.What payment methods are accepted for AH3729Q-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3729Q-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3729Q-SA-7?
AH3729Q-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3729Q-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 AH3729Q-SA-7?
For technical support, including AH3729Q-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3729Q-SA-7 requirements.
6.How does Aetrix verify that AH3729Q-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH3729Q-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 AH3729Q-SA-7 meets industry standards.
7.What is the process for return or replacement of AH3729Q-SA-7?
All AH3729Q-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3729Q-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 AH3729Q-SA-7 part is unused and in its original packaging.
Return procedure for AH3729Q-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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