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Diodes Incorporated AH374-P-A
- Part No.:
- AH374-P-A
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP, Formed Leads
- Datasheet:
-
AH374-P-A.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,426
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Product details
Overview
AH374-P-A from Diodes Incorporated is a bipolar Hall-effect latched sensor IC designed for electronic commutation in brushless DC motors. It integrates a Hall voltage generator, amplifier, Schmitt trigger with hysteresis, and open-drain output; operates from 2.2V to 20V supply; delivers 25mA sink current; and functions across –40°C to +125°C. Used in BLDC motor control timing and speed sensing.
For engineers reviewing the AH374-P-A datasheet, AH374-P-A pinout, AH374-P-A application, or AH374-P-A equivalent, key selection criteria include magnetic operate/release points (BOP = 5–60 Gauss, BRP = –60 to –5 Gauss), open-drain pre-driver capability, wide VDD range, thermal derating curves per package, and SIP-3/SOT23/SC59 footprint compatibility.
Technical Context
The AH374 implements a bipolar latch architecture: output switches low when south-pole flux exceeds BOP and remains latched until north-pole flux falls below BRP-enabling robust position detection in rotating systems. Its internal band-gap regulator ensures stable operation across 2.2V–20V input while compensating for temperature drift.
Switching behavior is defined by magnetic hysteresis (BHY ≈ 60 Gauss), noise immunity via Schmitt trigger, and output saturation voltage ≤400 mV at 20 mA sink. The device supports direct interface to microcontroller GPIOs or external pull-up resistors (10kΩ–100kΩ) without additional buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Range | 2.2 V to 20 V: Enables direct use with 3.3V, 5V, 12V, and 24V motor control rails without external regulation. |
| BOP / BRP | 5–60 G / –60 to –5 G: Bipolar switching thresholds support reliable rotor pole detection in BLDC fans and pumps. |
| Output Sink | 25 mA max: Drives logic-level inputs or small relays directly; compatible with standard 10kΩ pull-ups. |
| VOUT(SAT) | ≤400 mV @ 20 mA: Ensures clean low-state signaling to downstream CMOS/TTL interfaces. |
| Operating Temp | –40°C to +125°C: Validated for under-hood automotive fan control and industrial motor drives. |
| Package Options | SIP-3 (Ammo/Bulk), SOT23, SC59: Supports through-hole and surface-mount assembly across cost- and space-constrained designs. |
Pinout & Package
Available in SIP-3 (Ammo Pack), SIP-3 (Bulk Pack), SC59, and SOT23 packages. All variants share identical 3-pin topology with VDD, GND, and open-drain OUT terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Power supply input | Accepts 2.2–20 V DC; powers internal regulator, Hall plate, and output stage; requires 10nF–100nF bypass capacitor. |
| 2 - GND | Ground reference | Common return path for Hall sensor, amplifier, and output driver; must be low-impedance to minimize noise coupling. |
| 3 - OUT | Open-drain output | Sinks up to 25 mA; requires external pull-up resistor (10kΩ–100kΩ); asserts low during magnetic latch-on state. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | Retains output state between magnetic transitions-eliminates need for external latching logic in motor phase sequencing. |
| Integrated Schmitt trigger | 60 Gauss hysteresis prevents chatter near BOP/BRP thresholds under vibration or EMI in rotating machinery. |
| Wide VDD range (2.2–20 V) | Supports direct connection to battery-fed BLDC controllers without LDO-reducing BOM count and power loss. |
| –40°C to +125°C operation | Validated for under-hood automotive cooling fans and industrial HVAC blowers with minimal derating. |
| RoHS-compliant & halogen-free | Meets EU RoHS 3 (2015/863/EU) and automotive green standards-enabling compliance in Tier 1 supply chains. |
Applications
| BLDC Motor Commutation | Brushless Fan Control |
|---|---|
|
Use Scenario: Detecting rotor magnet polarity to sequence stator coil energization in 3-phase BLDC motors. IC Role / Device Role / Timing Role: Hall latch providing synchronized edge-triggered signals for MCU-based six-step commutation. Use Value: Enables precise 60° electrical phase alignment with <±5° timing error over temperature and supply variation. |
Use Scenario: Monitoring rotation of axial fans in server chassis or telecom power supplies. IC Role / Device Role / Timing Role: Outputting pulse train proportional to fan RPM for closed-loop speed regulation. Use Value: Delivers stable 25 mA sink drive into tachometer input circuits across 12V/24V rail variations. |
| Revolution Counting | Speed Measurement |
|
Use Scenario: Counting gear tooth or magnet passes on rotating shafts in industrial encoders. IC Role / Device Role / Timing Role: Digital position sensor generating clean, debounced pulses per revolution. Use Value: Hysteresis eliminates false counts from mechanical bounce or EMI in high-vibration environments. |
Use Scenario: Measuring rotational speed of pump impellers or conveyor rollers in factory automation. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector feeding frequency-to-voltage converter or timer capture input. Use Value: Stable BOP/BRP specs ensure ±3% speed accuracy from 100 RPM to 20,000 RPM across –40°C to +125°C. |
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 | Direct replacement with identical pinout, same BOP/BRP specs, improved ESD rating (±4kV HBM), and extended production lifecycle. | Drop-in upgrade path for new designs; no layout or firmware changes required. | Select AH3774 for new designs requiring long-term availability and enhanced robustness. |
| AL374Q | AEC-Q100 Grade 0 qualified (–40°C to +150°C), higher BOP min (10 G), tighter BRP tolerance (±3 G), and IATF 16949 manufacturing. | Required for automotive engine bay or transmission control modules where AEC qualification is mandatory. | Choose AL374Q only when AEC-Q100 compliance and extended junction temperature are contractually specified. |
Compared with AH374-P-A, AH3774 offers guaranteed continuity and marginally better ESD performance without design change, while AL374Q adds automotive qualification at higher cost and tighter magnetic tolerances-making AH374-P-A suitable only for legacy or non-automotive industrial reuse.
Availability
AH374-P-A is available at Aetrix Electronics and suitable for brushless DC motor commutation, fan speed monitoring, revolution counting, and industrial speed measurement requiring stable component supply despite its obsolete status.
Supply support for AH374-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 manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and sensor solutions for industrial, computing, and automotive markets.
The AH374 belongs to Diodes' Hall-effect sensor product line, engineered for reliable magnetic position sensing in motor control and motion feedback systems where latch stability and wide supply range are critical.
FAQ
Is AH374-P-A still in production?
No-AH374-P-A is officially discontinued and marked obsolete per Diodes' DS39163 Rev. 4 (May 2023). It remains available through authorized distributors' remaining inventory and Aetrix Electronics' legacy component program with full traceability and date-code verification.
What is the correct orientation for magnetic actuation on AH374-P-A in SIP-3 package?
For SIP-3 (Ammo Pack) and SIP-3 (Bulk Pack), apply south pole to the part marking side to activate output (BOP); north pole to the same side to release (BRP). Polarity orientation differs for SC59 (non-marking side active), so package-specific mounting must be verified.
Can AH374-P-A drive an LED directly?
Yes-its 25 mA sink capability allows direct driving of standard 20 mA LEDs with appropriate series resistance. For example, with 12 V supply and 2.0 V LED forward voltage, a 470 Ω resistor limits current to ~21 mA while maintaining VOUT(SAT) ≤400 mV.
Does AH374-P-A require a decoupling capacitor?
Yes-a 10 nF to 100 nF ceramic capacitor between VDD and GND is mandatory per Diodes' typical application circuit. It stabilizes the internal band-gap regulator and suppresses supply noise that could cause false triggering near BOP/BRP thresholds.
AH374-P-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP, Formed Leads
- Packaging:
- Tape & Box (TB)
- 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:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH374-P-A FAQ
1.How can I place an order for AH374-P-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AH374-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 AH374-P-A reliable?
The price and inventory of AH374-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 AH374-P-A is usually 5 days.
3.What payment methods are accepted for AH374-P-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH374-P-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH374-P-A?
AH374-P-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH374-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 AH374-P-A?
For technical support, including AH374-P-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH374-P-A requirements.
6.How does Aetrix verify that AH374-P-A is sourced from the original manufacturer or authorized distributors?
All AH374-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 AH374-P-A meets industry standards.
7.What is the process for return or replacement of AH374-P-A?
All AH374-P-A units undergo pre-shipment inspection (PSI). If there is an issue with AH374-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 AH374-P-A part is unused and in its original packaging.
Return procedure for AH374-P-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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