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Diodes Incorporated AH3774-W-7
- Part No.:
- AH3774-W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH3774-W-7.pdf
- Description:
- MAGNETIC SWITCH LATCH SC59
- Quantity:
- Payment:
- Shipping:
Inventory:3,930
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Product details
Overview
AH3774-W-7 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-W-7 datasheet, AH3774-W-7 pinout, AH3774-W-7 application, or AH3774-W-7 equivalent, this device supports robust contactless sensing in high-noise, wide-voltage environments-particularly where magnetic polarity orientation, open-drain drive capability, and reverse-battery protection are critical selection criteria.
Technical Context
The AH3774 employs dynamic offset cancellation via chopper stabilization to suppress thermal drift and mechanical stress effects, enabling stable Bop/Brp hysteresis of 40–120G over –40°C to +125°C. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, while the single open-drain output integrates overcurrent limiting (30–55mA) and Zener clamping (28V).
It implements bipolar latching logic: South pole applied to the marked side (SC59) or unmarked side (SOT23/SIP-3) switches output low; North pole reversal releases it. Magnetic polarity sensitivity is package-dependent, with SC59 requiring South pole on the non-marking side-verified by functional block diagram and pin assignment diagrams in DS37899 Rev. 2–3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - enables direct integration into 12V/24V industrial and appliance power rails without external regulation. |
| Operate Point (Bop) | +40G typical - detects weak magnetic fields from small or distant magnets in compact BLDC rotor assemblies. |
| Release Point (Brp) | –40G typical - provides 80G hysteresis to prevent chatter near switching thresholds under vibration or EMI. |
| Output Type | Open-drain, 60mA continuous - supports flexible pull-up configurations and direct interface to microcontroller GPIO or logic-level drivers. |
| Startup Time | 10µs typical - ensures rapid system readiness after power-on, critical for real-time RPM measurement and motor startup sequencing. |
| ESD Rating | HBM ±6kV - withstands handling and board-level electrostatic events without latch-up or parametric shift. |
| Operating Temperature | –40°C to +125°C - validated for under-hood, motor housing, and sealed appliance environments without derating. |
Pinout & Package
Package: SC59 - surface-mount, 3-pin, lead-free, RoHS-compliant package with 2.80mm × 2.90mm footprint and 1.10mm height; optimized for automated placement and thermal dissipation up to 230mW at 25°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive supply input | Accepts 3.0–28V; includes reverse-blocking diode and Zener clamp (28V) for battery-reversal and load-dump protection. |
| 2 - GND | Ground reference | Common return path for internal circuitry and output switch; requires low-impedance PCB connection to minimize noise coupling. |
| 3 - OUTPUT | Open-drain output | Sinks up to 60mA when active; requires external pull-up; clamped to 28V to protect against inductive kickback or bus transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | South pole activates, North pole deactivates - eliminates need for external polarity inversion in dual-Hall commutation schemes. |
| Chopper-stabilized architecture | Reduces offset drift to <±0.1mV/°C - maintains consistent Bop/Brp across temperature without calibration. |
| Integrated reverse-battery protection | Withstands –32V reverse supply - prevents damage during incorrect battery installation in portable or automotive-adjacent systems. |
| RF noise immunity | Validated per IEC 61000-4-3 - operates reliably in proximity to switching power supplies and motor drives without shielding. |
| High sensitivity at low voltage | Bop = +40G at VDD = 3V - enables use with coin-cell or energy-harvesting sources in ultra-low-power sensor nodes. |
Applications
| BLDC Motor Commutation | RPM Measurement |
|---|---|
|
Use Scenario: Detecting rotor position in 3-phase brushless DC fans used in HVAC systems and kitchen appliances. IC Role / Device Role / Timing Role: Bipolar latch providing synchronized hall signals to MCU for electronic commutation timing. Use Value: Enables precise 120° electrical phase alignment with ±40G sensitivity, reducing torque ripple and acoustic noise at variable speeds. |
Use Scenario: Monitoring rotational speed of washing machine drum via magnet-embedded pulley. IC Role / Device Role / Timing Role: Edge-triggered pulse generator feeding timer/counter peripheral for real-time RPM calculation. Use Value: 10µs startup time and 3.75µs propagation delay ensure accurate high-speed counting up to 100k RPM with minimal jitter. |
| Flow Meter Sensing | Linear Position Encoder |
|
Use Scenario: Measuring water flow rate in smart home water heaters using rotating impeller with embedded magnets. IC Role / Device Role / Timing Role: Contactless magnetic switch generating pulses proportional to volumetric flow rate. Use Value: ±40G operate/release points allow reliable detection through plastic meter housings up to 2.5mm thick without signal attenuation. |
Use Scenario: Detecting linear displacement of sliding door tracks in robotic vacuum cleaners. IC Role / Device Role / Timing Role: Latched position indicator reporting discrete travel zones (e.g., docked, mid-travel, fully extended). Use Value: 80G hysteresis prevents false toggling during mechanical vibration, ensuring stable zone reporting without software debouncing. |
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 | Successor part with identical SC59 package, same 3–28V range, but improved Bop/Brp tolerance (±30G min vs ±20G min) and lower IDD (2.5mA typ vs 3mA). | Designed for new designs requiring AEC-Q100 qualification support and extended lifecycle assurance; not drop-in compatible due to revised test limits. | Select AH3724-W-7 for production ramp; AH3774-W-7 remains valid for legacy repair or existing BOM continuity. |
| AL3774W-7 | Same pinout and function, but manufactured by Allegro; Bop/Brp ±35G typical, 50mA output current limit, no reverse-battery diode. | Lacks integrated reverse-supply protection - requires external diode in automotive or field-serviceable equipment. | Choose only if Allegro sourcing is mandated; verify external protection and validate hysteresis margin in target operating conditions. |
Compared with AH3774-W-7, AH3724-W-7 offers tighter magnetic thresholds and lower quiescent current for next-gen designs, while AL3774W-7 trades integrated protection for alternate supply-chain access-making AH3774-W-7 optimal for cost-sensitive, high-reliability industrial replacements where reverse-battery resilience is non-negotiable.
Availability
AH3774-W-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, flow meter sensing, and linear position encoder applications requiring stable component supply across extended temperature and voltage ranges.
Supply support for AH3774-W-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 manufacturer of discrete semiconductors and ICs, specializing in high-reliability power management, signal integrity, and sensing solutions for industrial, automotive, and consumer markets.
AH3774-W-7 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, wide-voltage-position feedback in motion control systems where magnetic immunity, thermal stability, and package flexibility are essential.
FAQ
What magnetic polarity configuration is required for AH3774-W-7 in SC59 package?
The AH3774-W-7 in SC59 package requires the South pole to be applied to the non-part-marking side to activate the output. This is explicitly defined in the datasheet's magnetic characteristics table and differs from SOT23/SIP-3 variants, which require South pole on the marking side. Incorrect polarity orientation results in no output switching.
Does AH3774-W-7 include reverse-voltage protection, and what is its rating?
Yes, AH3774-W-7 integrates a reverse-blocking diode and Zener clamp on the VDD pin, rated for –32V absolute maximum reverse supply voltage. This protects against accidental battery reversal in 12V/24V systems and eliminates the need for an external series diode in most industrial and appliance designs.
Can AH3774-W-7 operate reliably at 3.0V supply, and how does sensitivity change?
Yes, AH3774-W-7 is fully specified down to 3.0V: Bop remains +40G typical at 3V, and startup time stays at 10µs. The chopper-stabilized design maintains sensitivity across the full 3–28V range, confirmed by Figure 5 in DS37899 showing <±5G variation in Bop/Brp from 3V to 28V at +25°C.
Is AH3774-W-7 recommended for new designs, and what is the replacement?
No-Diodes explicitly states "THE AH3774 IS NOT RECOMMENDED FOR NEW DESIGNS. PLEASE USE THE AH3724." The AH3724-W-7 is the designated successor, offering tighter magnetic specifications, lower supply current, and ongoing lifecycle support, while maintaining SC59 packaging and pin compatibility for seamless migration.
AH3774-W-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:
- 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:
- Surface Mount
- Supplier Device Package:
- SC-59-3
AH3774-W-7 FAQ
1.How can I place an order for AH3774-W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3774-W-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 AH3774-W-7 reliable?
The price and inventory of AH3774-W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3774-W-7 is usually 5 days.
3.What payment methods are accepted for AH3774-W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3774-W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3774-W-7?
AH3774-W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3774-W-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 AH3774-W-7?
For technical support, including AH3774-W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3774-W-7 requirements.
6.How does Aetrix verify that AH3774-W-7 is sourced from the original manufacturer or authorized distributors?
All AH3774-W-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 AH3774-W-7 meets industry standards.
7.What is the process for return or replacement of AH3774-W-7?
All AH3774-W-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3774-W-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 AH3774-W-7 part is unused and in its original packaging.
Return procedure for AH3774-W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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