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Diodes Incorporated AH374-P-B
- Part No.:
- AH374-P-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH374-P-B.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,324
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Product details
Overview
AH374-P-B from Diodes Incorporated is a bipolar Hall-effect latched sensor IC designed for electronic commutation in brushless DC motor and fan control systems. It features open-drain output with 25mA sink capability, operates from 2.2V to 20V, and delivers magnetic switching hysteresis (60 Gauss) across –40°C to +125°C for robust rotor position sensing in automotive and industrial BLDC drives.
For engineers reviewing the AH374-P-B datasheet, AH374-P-B pinout, AH374-P-B application, or AH374-P-B equivalent, key selection criteria include latch polarity behavior (BOP/BRP asymmetry), wide VDD range tolerance, open-drain pre-driver compatibility with external pull-up networks, and SIP-3 (Bulk Pack) mechanical fit for high-volume motor assembly lines.
Technical Context
The AH374 integrates a Hall plate, low-noise amplifier, Schmitt trigger with fixed hysteresis, and band-gap-regulated internal supply - enabling stable magnetic sensing without external voltage regulation. Its latch function holds state until magnetic polarity reversal crosses BRP, eliminating need for external latching logic.
It supports direct interface to microcontroller GPIOs or discrete MOSFET gates via open-drain output, with VOUT(SAT) ≤400mV at 20mA sink and IOFF leakage <10µA. Magnetic thresholds are specified across full VDD (2.5–20V) and temperature (–40°C to +125°C), ensuring consistent commutation timing under load and thermal stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2V to 20V - enables direct connection to 3.3V, 5V, 12V, or 24V motor control rails without LDO. |
| Output Type | Open-drain - allows wired-OR configuration and flexible pull-up to any logic rail (e.g., 3.3V MCU I/O). |
| Sink Current | 25mA - sufficient to drive gate of small-signal N-MOSFETs or directly interface with optocoupler inputs. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive BLDC fans and industrial motor controllers. |
| Magnetic Hysteresis | 60 Gauss - suppresses chatter during slow-speed rotation or vibration-induced flux fluctuations. |
| BOP / BRP | +30 / –30 Gauss (typ) - bipolar latch behavior ensures reliable direction-sensitive commutation. |
| Power Dissipation | 550 mW (SIP-3 Bulk Pack) - supports continuous operation up to 125°C ambient with derating. |
Pinout & Package
AH374-P-B is supplied in SIP-3 (Bulk Pack) package: straight-lead, 3-pin single-inline package with 2.51–2.57mm body height, 14.0–15.0mm length, and 2.8–3.2mm width. Pin 1 = VDD, Pin 2 = GND, Pin 3 = OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive supply input | Accepts 2.2–20V; powers internal regulator, Hall plate, and output stage - no external decoupling required beyond 10nF–100nF. |
| 2 - GND | Ground reference | Common return for supply and output sink path; 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 resistor (10kΩ–100kΩ) to define logic-high level and slew rate. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | Retains output state until magnetic polarity reversal crosses BRP - eliminates need for external flip-flop in BLDC hall sensor arrays. |
| Wide VDD range (2.2–20V) | Supports direct integration into 12V/24V motor control boards without auxiliary regulators - reduces BOM count and layout area. |
| 25mA output sink | Drives standard logic-level N-channel MOSFET gates or optocouplers without buffer stages - simplifies gate-drive circuitry. |
| –40°C to +125°C operation | Validated performance over full automotive under-hood temperature range - suitable for engine-coolant-pump and radiator-fan applications. |
| RoHS-3 & Halogen-free | Complies with EU Directive 2015/863/EU and Diodes' "Green" definition (<900ppm Br/Cl, <1000ppm Sb) - meets Tier-1 automotive sourcing requirements. |
Applications
| BLDC Motor Commutation | Brushless Fan Control |
|---|---|
|
Use Scenario: Rotor position detection in 3-phase BLDC motors for HVAC compressors and power tools. IC Role / Device Role / Timing Role: Hall latch providing synchronized phase-switching signals to inverter gate drivers. Use Value: 60-Gauss hysteresis prevents false triggering during torque ripple or mechanical vibration, maintaining precise 120° electrical sector alignment. |
Use Scenario: Speed feedback and direction sensing in automotive radiator cooling fans. IC Role / Device Role / Timing Role: Magnetic latch generating pulse train proportional to fan RPM for closed-loop speed control. Use Value: Wide 2.2–20V supply range accommodates battery voltage sag (e.g., 9V cranking) while maintaining valid output logic levels. |
| Revolution Counting | Speed Measurement |
|
Use Scenario: Gear tooth counting in industrial conveyor belt encoders. IC Role / Device Role / Timing Role: Bipolar latch detecting passing ferrous gear teeth to generate clean edge-triggered pulses. Use Value: Open-drain output interfaces directly to microcontroller counter peripherals with configurable pull-up voltage - no level-shifting needed. |
Use Scenario: Real-time RPM monitoring in electric power steering (EPS) assist motors. IC Role / Device Role / Timing Role: Magnetic switch generating tachometer signal for ECU-based torque compensation algorithms. Use Value: Guaranteed operation down to –40°C ensures cold-start reliability in northern climates without heater circuits or calibration offsets. |
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 vs. ±2kV), and updated RoHS compliance. | Drop-in upgrade path; supports same BLDC commutation and fan control use cases with enhanced robustness. | Select AH3774 for new designs requiring extended lifecycle support and higher ESD immunity in production environments. |
| AL374Q | AEC-Q100 Grade 1 qualified (–40°C to +125°C), same electrical specs, but with PPAP documentation and IATF 16949 manufacturing traceability. | Required for automotive OEM programs demanding formal change control, audit-ready documentation, and zero-defect sourcing. | Choose AL374Q when supplying to Tier-1 automotive customers with mandatory AEC-Q100 and PPAP compliance requirements. |
Compared with AH374-P-B, AH3774 offers immediate obsolescence mitigation and higher ESD resilience, while AL374Q adds automotive qualification rigor - both retain identical functional behavior and SIP-3 mechanical compatibility for seamless transition.
Availability
AH374-P-B is available at Aetrix Electronics and suitable for brushless DC motor commutation, brushless fan control, revolution counting, and speed measurement applications requiring stable component supply during legacy system maintenance and repair cycles.
Supply support for AH374-P-B 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 sensing solutions for automotive, industrial, and consumer markets.
The AH374 belongs to Diodes' Hall-effect sensor product line, engineered specifically for reliable rotor position detection and speed feedback in brushless DC motor systems - emphasizing latch stability, wide supply tolerance, and automotive-grade thermal performance.
FAQ
Is AH374-P-B still in production?
No - AH374-P-B is officially obsolete and discontinued per Diodes Incorporated's DS39163 Rev. 4 (May 2023). It remains available through Aetrix Electronics for legacy system support and repair, but no new manufacturing runs are scheduled. Customers are advised to migrate to AH3774 for long-term design continuity.
What is the correct pull-up resistor value for AH374-P-B's open-drain output?
The recommended pull-up resistor for AH374-P-B is 10kΩ to 100kΩ, connected between OUT (Pin 3) and the target logic rail (e.g., 3.3V or 5V). Lower values improve rise time but increase quiescent current; higher values reduce power but may degrade noise immunity in electrically noisy motor environments.
Can AH374-P-B operate at 2.2V supply and still provide accurate magnetic switching?
AH374-P-B begins functional operation above 2.2V, but its magnetic characteristics (BOP/BRP) are only guaranteed within specification when VDD ≥2.5V. At 2.2V, output switching occurs but may exhibit drift or reduced hysteresis - use 2.5V minimum for production-critical commutation timing.
How does the SIP-3 (Bulk Pack) package differ mechanically from SIP-3 (Ammo Pack)?
SIP-3 (Bulk Pack) uses straight leads with 0.63–0.84mm lead thickness and 14.0–15.0mm body length, optimized for manual or semi-automated insertion. SIP-3 (Ammo Pack) has spread leads (45° bend) and different lead pitch - both share identical pinout and electrical specs but require distinct PCB footprints and assembly tooling.
AH374-P-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP
- Packaging:
- Bulk
- 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-B FAQ
1.How can I place an order for AH374-P-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH374-P-B 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-B reliable?
The price and inventory of AH374-P-B 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-B is usually 5 days.
3.What payment methods are accepted for AH374-P-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH374-P-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH374-P-B?
AH374-P-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH374-P-B 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-B?
For technical support, including AH374-P-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH374-P-B requirements.
6.How does Aetrix verify that AH374-P-B is sourced from the original manufacturer or authorized distributors?
All AH374-P-B 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-B meets industry standards.
7.What is the process for return or replacement of AH374-P-B?
All AH374-P-B units undergo pre-shipment inspection (PSI). If there is an issue with AH374-P-B, 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-B part is unused and in its original packaging.
Return procedure for AH374-P-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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