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Diodes Incorporated AH3774-P-A
- Part No.:
- AH3774-P-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP Module
- Datasheet:
-
AH3774-P-A.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,879
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Product details
Overview
AH3774-P-A from Diodes Incorporated is a high-voltage, high-sensitivity bipolar Hall-effect latch IC designed for brushless DC motor commutation and position sensing in industrial and consumer appliances. It operates from 3.0V to 28V, features ±40G typical operate/release points (Bop/Brp), delivers 60mA continuous output current, and uses chopper-stabilized architecture for temperature-stable switching across –40°C to +125°C.
For engineers reviewing the AH3774-P-A datasheet, AH3774-P-A pinout, AH3774-P-A application, or AH3774-P-A equivalent, key selection criteria include magnetic polarity dependency per package type, open-drain output with Zener clamp and overcurrent limit, supply reverse protection, and compatibility with 10nF–100nF bypass capacitors for RF noise immunity.
Technical Context
The AH3774 employs dynamic offset cancellation via chopper stabilization to suppress thermal drift and mechanical stress-induced errors, achieving ±20G Bop/Brp variation over –40°C to +125°C. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, enabling stable operation across the full 3.0V–28V supply range.
Magnetic actuation is polarity- and package-dependent: SOT23 and SIP-3 require South pole on the part-marking side to turn on, while SC59 requires South pole on the non-marking side. Output latching behavior holds state until magnetic reversal crosses Brp, providing hysteresis of 40G–120G depending on temperature and supply voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - supports direct connection to 12V/24V industrial rails without external regulation |
| Operating Temperature | –40°C to +125°C - qualified for under-hood and motor-control environments |
| Bop / Brp (Typical) | +40G / –40G at +25°C - enables reliable detection with low-strength magnets or increased air gaps |
| Output Type | Single open-drain - compatible with standard pull-up resistors and microcontroller GPIO inputs |
| Output Current Limit | 30–55mA - protects against short-circuit loads while driving typical indicator LEDs or logic-level MOSFET gates |
| Startup Time | 10µs typical - ensures fast system response after power-on, critical for RPM measurement |
| ESD Rating (HBM) | 6kV - provides robust handling during PCB assembly and field service |
Pinout & Package
Package: SIP-3 (Ammo Pack) - 3-pin single-inline package with spread leads, RoHS-compliant, lead-free, halogen-free, and rated for 550mW power dissipation at 25°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power supply input with integrated reverse-blocking diode and Zener clamp (28V) - tolerates –32V reverse battery transients |
| 2 | GND | Ground reference for internal regulator and Hall sensor - must be low-impedance to minimize noise coupling |
| 3 | OUTPUT | Open-drain NMOS output with 60mA continuous rating and internal current limiting - requires external pull-up resistor (RL) |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar Latch Operation | South pole activates output (low), North pole releases - eliminates need for external polarity control logic |
| Chopper-Stabilized Architecture | Reduces offset drift to <±0.5G/°C - maintains consistent Bop/Brp across temperature without calibration |
| Integrated Protection | Reverse-battery diode + Zener clamp on VDD, plus output Zener clamp and 55mA current limit - reduces external protection components by ≥3 |
| Magnetic Hysteresis | 40G–120G programmable via magnet strength and orientation - prevents chatter in noisy mechanical environments |
| RF Noise Immunity | Validated per IEC 61000-4-3 - operates reliably near motors, inverters, and switching power supplies without added shielding |
Applications
| Brushless DC Motor Commutation | RPM Measurement |
|---|---|
|
Use Scenario: Detecting rotor position in 3-phase BLDC fans used in HVAC systems and kitchen appliances. IC Role / Device Role / Timing Role: Hall latch providing six-step commutation timing signals to gate driver ICs. Use Value: Enables precise 120° electrical phase alignment with ±1° angular accuracy over temperature, reducing torque ripple and acoustic noise. |
Use Scenario: Counting gear teeth on rotating shafts in washing machine drum drives and power tools. IC Role / Device Role / Timing Role: Magnetic edge detector generating clean TTL-compatible pulses synchronized to shaft rotation. Use Value: Delivers jitter <1µs per pulse at 20kHz, supporting accurate speed feedback for closed-loop motor control. |
| Flow Meter Sensing | Linear Position Encoder |
|
Use Scenario: Monitoring turbine rotation in residential water meters with permanent-magnet impellers. IC Role / Device Role / Timing Role: Low-power magnetic switch detecting flow rate via pulse frequency proportional to volumetric flow. Use Value: Operates down to 3.0V supply and consumes ≤4mA at 125°C - extends battery life and enables wide-temperature deployment. |
Use Scenario: Measuring linear displacement in smart appliance door latches and robotic actuator feedback loops. IC Role / Device Role / Timing Role: Absolute position latch triggered by magnet array mounted on moving carriage. Use Value: ±40G sensitivity allows use of small, low-cost NdFeB magnets at 3mm air gap - simplifies mechanical design and reduces BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3724-W-7 | Same pinout (SC59), lower Bop/Brp (±25G), 2.7V–26V supply, improved ESD (8kV HBM) | Higher sensitivity margin required; optimized for low-power portable devices | Select when upgrading legacy AH3774 designs requiring longer lifecycle support and tighter magnetic thresholds |
| AL3774QSA-7 | AEC-Q100 Grade 1 qualified (–40°C to +125°C), same Bop/Brp, automotive-grade screening and PPAP support | Required for automotive body electronics and EPS modules where qualification documentation is mandatory | Choose for new automotive programs needing certified reliability data and IATF 16949 traceability |
Compared with AH3774-P-A, AH3724-W-7 offers enhanced manufacturability and extended availability, while AL3774QSA-7 adds automotive qualification overhead but no functional improvement - both retain identical magnetic polarity behavior and open-drain interface.
Availability
AH3774-P-A is available at Aetrix Electronics and suitable for brushless DC motor commutation, flow metering, RPM sensing, and linear position encoding requiring stable component supply across industrial and consumer appliance production cycles.
Supply support for AH3774-P-A 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 power management, signal integrity, and sensing applications.
The AH3774 belongs to Diodes' Hall-effect sensor product line, engineered for high-voltage industrial position sensing with integrated protection and wide-temperature reliability - targeting cost-sensitive, high-volume appliance and motor-control markets.
FAQ
What is the magnetic polarity requirement for AH3774-P-A activation?
AH3774-P-A uses SIP-3 (Ammo Pack) packaging, which follows the SOT23/SIP-3 polarity convention: the South pole must be applied to the part-marking side to turn the output ON. Applying North pole to that side releases the latch. This is confirmed in the datasheet's magnetic polarity diagram on page 4.
Can AH3774-P-A operate directly from a 24V automotive battery?
Yes - AH3774-P-A supports 3.0V to 28V supply and includes reverse-battery protection (–32V rating) and a 28V Zener clamp on VDD. It withstands load-dump transients up to 32V for short durations, making it suitable for 24V rail monitoring in commercial vehicles without external TVS diodes.
Is an external capacitor required for stable operation?
Yes - the datasheet specifies a 10nF to 100nF ceramic capacitor (CIN) between VDD and GND to stabilize the internal regulator and improve RF noise immunity. Omitting CIN increases susceptibility to switching noise from nearby MOSFETs or motor drivers, potentially causing false triggering.
Why is AH3774-P-A not recommended for new designs?
Diodes Incorporated explicitly states "THE AH3774 IS NOT RECOMMENDED FOR NEW DESIGNS. PLEASE USE THE AH3724" in the datasheet. The AH3724 offers improved ESD robustness (8kV vs. 6kV), tighter magnetic thresholds, and active long-term supply assurance - making it the designated migration path for all new projects.
AH3774-P-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP Module
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Function:
- Latch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 6mT Trip, -6mT Release
- Test Condition:
- -40°C ~ 125°C
- Voltage - Supply:
- 3V ~ 28V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 60mA
- Output Type:
- Open Drain
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH3774-P-A FAQ
1.How can I place an order for AH3774-P-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3774-P-A 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 AH3774-P-A reliable?
The price and inventory of AH3774-P-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3774-P-A is usually 5 days.
3.What payment methods are accepted for AH3774-P-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3774-P-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3774-P-A?
AH3774-P-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3774-P-A 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 AH3774-P-A?
For technical support, including AH3774-P-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3774-P-A requirements.
6.How does Aetrix verify that AH3774-P-A is sourced from the original manufacturer or authorized distributors?
All AH3774-P-A 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 AH3774-P-A meets industry standards.
7.What is the process for return or replacement of AH3774-P-A?
All AH3774-P-A units undergo pre-shipment inspection (PSI). If there is an issue with AH3774-P-A, 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 AH3774-P-A part is unused and in its original packaging.
Return procedure for AH3774-P-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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