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Diodes Incorporated AH374-W-7
- Part No.:
- AH374-W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH374-W-7.pdf
- Description:
- MAGNETIC SWITCH LATCH SC59-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,087
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Product details
Overview
AH374-W-7 from Diodes Incorporated is a bipolar Hall-effect latched sensor in SC59 package, designed for electronic commutation in brushless DC motors. It operates from 2.2V to 20V, delivers 25mA sink current, features ±30G typical operate/release points, and functions across –40°C to +125°C - deployed in motor control feedback loops requiring robust magnetic switching.
For engineers reviewing the AH374-W-7 datasheet, AH374-W-7 pinout, AH374-W-7 application, or AH374-W-7 equivalent, key selection criteria include latch polarity behavior, open-drain output drive capability, wide supply range tolerance, thermal derating in SC59, and magnetic hysteresis margin for noisy environments.
Technical Context
The AH374-W-7 implements a bipolar latch architecture: South-pole exposure on the non-marking side of the SC59 package triggers output turn-on (OUT pulled low), and North-pole exposure releases it. Its internal band-gap regulator enables stable operation across 2.2–20V while compensating for temperature drift in magnetic thresholds.
Switching is conditioned by a Schmitt trigger with 60G typical hysteresis (BHY), rejecting EMI-induced false toggling. The open-drain output requires an external pull-up resistor (10kΩ–100kΩ) and supports up to 25mA sink current at VDD = 12V with <400mV saturation voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2V to 20V - Enables direct interface with 3.3V, 5V, and 12V motor control rails without LDO. |
| Output Type | Open-drain - Allows wired-OR logic, level translation, and flexible pull-up configuration. |
| Sink Current | 25mA - Drives standard optocouplers or logic-level MOSFET gates directly. |
| Operating Temperature | –40°C to +125°C - Qualified for under-hood automotive and industrial fan applications. |
| Magnetic Hysteresis | 60G typical - Prevents chatter during slow or oscillating field transitions near BOP/BRP. |
| Output Saturation | ≤400mV @ 20mA - Ensures clean logic-low signaling even under full load. |
| Power Dissipation (SC59) | 230mW @ 25°C - Requires thermal derating above 25°C per published curve. |
Pinout & Package
AH374-W-7 is housed in SC59 package - a 3-pin single-inline package with gull-wing leads, optimized for surface-mount assembly and magnetic field access from the top die surface. Pin 1 is VDD, Pin 2 is GND, Pin 3 is open-drain OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Positive supply input | Accepts 2.2–20V; powers internal regulator, Hall plate, and comparator - decoupling capacitor (10–100nF) required. |
| 2 (GND) | Ground reference | Common return for supply and output; must be low-impedance to minimize noise coupling into Hall sensing path. |
| 3 (OUT) | Open-drain output | Sinks up to 25mA when active; requires external pull-up to define logic-high level and timing edge rate. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | Requires opposite magnetic poles to set and reset - eliminates need for external bias magnets in BLDC rotor position sensing. |
| Wide supply range (2.2–20V) | Eliminates dedicated voltage regulation in 12V motor systems and supports brown-out tolerant startup down to 2.5V. |
| Integrated Schmitt trigger | 60G hysteresis ensures reliable switching in vibration-prone environments like cooling fans and power tools. |
| Temperature-compensated band-gap regulator | Maintains consistent BOP/BRP thresholds across –40°C to +125°C - critical for automotive HVAC blower reliability. |
| RoHS-compliant & halogen-free | Meets IEC 61249-2-21:2017; <900ppm Br, <900ppm Cl, <1000ppm Sb - suitable for green manufacturing and export compliance. |
Applications
| BLDC Motor Commutation | Brushless Fan Control |
|---|---|
|
Use Scenario: Rotor position detection in 3-phase BLDC motors for trapezoidal commutation. IC Role / Device Role / Timing Role: Hall latch providing synchronized digital edge signals to MCU timer inputs for phase switching. Use Value: Enables precise 60° electrical sector alignment with ±5G magnetic tolerance, reducing torque ripple below 3%. |
Use Scenario: Speed feedback and stall detection in server cooling fans. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector generating RPM pulses to fan controller PWM logic. Use Value: Supports 10,000+ hour MTBF with no contact wear, unlike mechanical switches or optical encoders. |
| Revolution Counting | Speed Measurement |
|
Use Scenario: Bidirectional rotation counting in industrial conveyor belt encoders. IC Role / Device Role / Timing Role: Direction-agnostic pulse generator triggered per magnet pole pair passing sensor. Use Value: Delivers deterministic 10µs max propagation delay variation over temperature - enabling sub-1RPM resolution at 10kHz sampling. |
Use Scenario: Real-time RPM monitoring in automotive radiator fans. IC Role / Device Role / Timing Role: Magnetic edge detector feeding frequency-to-voltage converter or microcontroller timer capture. Use Value: Maintains ±2% speed accuracy from –40°C to +125°C due to integrated thermal compensation of BOP/BRP. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH3774-W-7 | Successor part with improved BOP/BRP stability (±5G shift vs. ±15G), lower IDD (1.5mA typ), and AEC-Q100 Grade 1 qualification. | Required for new automotive designs needing PPAP documentation and extended temperature validation. | Select AH3774-W-7 for production programs where lifecycle continuity and automotive qualification are mandatory. |
| US1881LUA-AB3-B | Unipolar latch with 3.3V fixed supply, 10mA sink, and smaller SOT-23 package - lacks wide-voltage support and thermal range. | Suitable only for low-power consumer fans with stable 3.3V rails and ambient-temperature operation. | Choose US1881LUA-AB3-B only for cost-sensitive, non-automotive applications with constrained board space and narrow supply. |
Compared with AH374-W-7, AH3774-W-7 offers guaranteed automotive qualification and tighter magnetic specs but requires design revalidation; US1881LUA-AB3-B reduces footprint and cost but sacrifices supply flexibility and temperature resilience.
Availability
AH374-W-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, industrial fan control, revolution counting, and speed measurement applications requiring stable component supply despite its obsolete status - limited remaining stock with full traceability.
Supply support for AH374-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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal devices, with design centers across Asia, Europe, and the U.S., serving industrial, automotive, and computing markets.
AH374-W-7 belongs to Diodes' Hall-effect sensor product line, engineered for high-reliability rotor position sensing in electrically noisy motor drive environments - emphasizing latch stability, wide voltage operation, and automotive-grade thermal performance.
FAQ
Is AH374-W-7 still in production?
No - AH374-W-7 is officially obsolete and discontinued per Diodes' DS39163 Rev. 4 (May 2023). Aetrix Electronics holds final verified inventory with full lot traceability, but no further manufacturing is planned. Customers should migrate to AH3774-W-7 for new designs.
What is the correct magnet orientation for AH374-W-7 in SC59 package?
For SC59, the South pole must approach the non-part-marking side to activate the output (BOP); the North pole must then approach the same side to release it (BRP). This is reversed from SIP-3/SOT23 packages - confirmed in Figure 1 of DS39163.
Can AH374-W-7 drive a MOSFET gate directly?
Yes - with VDD ≥ 5V and a 10kΩ pull-up, AH374-W-7's 25mA sink capability can fully discharge standard logic-level N-channel MOSFET gates (e.g., DMN2004K) within 100ns, provided gate charge Qg ≤ 2.5nC.
Does AH374-W-7 require a bypass capacitor?
Yes - Diodes specifies a 10nF–100nF ceramic capacitor between VDD and GND, placed within 2mm of the SC59 pins. This stabilizes the internal regulator and suppresses supply noise that could cause false triggering near magnetic thresholds.
AH374-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:
- North Pole, South Pole
- Sensing Range:
- 5mT Trip, -5mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 2.2V ~ 20V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 25mA
- 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
AH374-W-7 FAQ
1.How can I place an order for AH374-W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH374-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 AH374-W-7 reliable?
The price and inventory of AH374-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 AH374-W-7 is usually 5 days.
3.What payment methods are accepted for AH374-W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH374-W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH374-W-7?
AH374-W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH374-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 AH374-W-7?
For technical support, including AH374-W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH374-W-7 requirements.
6.How does Aetrix verify that AH374-W-7 is sourced from the original manufacturer or authorized distributors?
All AH374-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 AH374-W-7 meets industry standards.
7.What is the process for return or replacement of AH374-W-7?
All AH374-W-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH374-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 AH374-W-7 part is unused and in its original packaging.
Return procedure for AH374-W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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