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Diodes Incorporated AH3774-P-B
- Part No.:
- AH3774-P-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP Module
- Datasheet:
-
AH3774-P-B.pdf
- Description:
- MAGNETIC SWITCH LATCH 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:300
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Product details
Overview
AH3774-P-B 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), includes chopper-stabilized architecture for temperature stability, and delivers a single open-drain output with overcurrent limiting and Zener clamping.
For engineers reviewing the AH3774-P-B datasheet, AH3774-P-B pinout, AH3774-P-B application, or AH3774-P-B equivalent, this device supports robust magnetic sensing in high-noise, wide-temperature (-40°C to +125°C), and high-supply-voltage environments - critical for RPM measurement, flow metering, and contactless angular indexing where polarity-specific latching and supply reverse protection are required.
Technical Context
The AH3774 employs dynamic offset cancellation via chopper stabilization to minimize switch-point drift across temperature and supply voltage, achieving ±20G Bop/Brp variation over -40°C to +125°C. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, while the integrated reverse-blocking diode and supply-side Zener clamp protect against -32V reverse battery transients.
It functions as a bipolar latch: South pole applied to the marked side (SOT23/SIP-3) or unmarked side (SC59) pulls the open-drain output low (VOUT_ON ≤ 0.4V @ 20mA); North pole releases it, holding state until magnetic reversal crosses Brp. Startup time is 10µs typical after VDD reaches 3V.
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. |
| Magnetic Sensitivity (Bop / Brp) | +40G / -40G typical - ensures reliable switching with low-strength magnets at room temperature; ±20G variation over full temp range. |
| Output Type | Single open-drain - requires external pull-up; supports flexible interfacing with MCU GPIOs or logic-level inputs. |
| Output Current Limit | 30–55mA - prevents damage during short-circuit or heavy capacitive loading on the output line. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood, motor control, and sealed-appliance environments. |
| ESD Robustness | 6kV HBM - withstands handling and board assembly electrostatic events without latch-up or parametric shift. |
| Startup Time | 10µs typical - guarantees fast system readiness after power-on, critical for real-time motor commutation timing. |
Pinout & Package
Package: SIP-3 (Bulk Pack) - straight-lead, through-hole package with 14.0–15.0mm body length, optimized for high-power dissipation (550mW at 25°C) and mechanical stability in vibration-prone motor assemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power supply input - accepts 3.0V–28V; includes internal reverse-blocking diode and 28V Zener clamp for fault tolerance. |
| 2 | GND | Ground reference - common return for internal circuitry and output current path; must be low-impedance for noise immunity. |
| 3 | OUTPUT | Open-drain output - sinks up to 55mA; requires external pull-up resistor (RL) for logic-high level; clamped to 32V max off-state. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar latch operation | South pole activates, North pole deactivates - eliminates need for active polarity reversal in BLDC rotor position tracking. |
| Chopper-stabilized architecture | Reduces thermal drift of Bop/Brp to ±20G over -40°C to +125°C - maintains consistent commutation timing across ambient extremes. |
| Integrated supply protection | Reverse-blocking diode + 28V Zener clamp - protects against -28V reverse battery faults without external components. |
| High RF noise immunity | Validated performance in noisy motor drive environments - reduces false triggering during PWM switching transients. |
| Lead-free & halogen-free | Compliant with RoHS 3 (2015/863/EU), <900ppm Br/Cl, <1000ppm Sb - meets global environmental and automotive supply chain requirements. |
Applications
| Brushless DC Motor Commutation | RPM Measurement |
|---|---|
|
Use Scenario: Detecting rotor magnet polarity in 3-phase BLDC motors for electronic commutation timing. IC Role / Device Role / Timing Role: Bipolar latch providing synchronized, polarity-triggered edge signals to MCU timer capture inputs. Use Value: Enables precise 6-step or sinusoidal commutation with <10µs startup latency and ±20G magnetic hysteresis to suppress bounce. |
Use Scenario: Counting magnetic transitions on rotating shafts in fans, pumps, or HVAC blowers. IC Role / Device Role / Timing Role: Digital pulse generator converting rotational speed into TTL-compatible frequency output. Use Value: Delivers stable 0.1–1µs rise/fall times and 6kV ESD immunity for reliable counting in electrically noisy equipment enclosures. |
| Flow Metering | Linear/Angular Position Sensing |
|
Use Scenario: Monitoring turbine or paddle wheel rotation in water/gas meters using embedded magnets. IC Role / Device Role / Timing Role: Contactless magnetic switch generating pulses proportional to volumetric flow rate. Use Value: Operates reliably from 3.0V to 28V - supports battery-powered or mains-powered meter designs without voltage scaling. |
Use Scenario: Detecting angular index positions in washing machine drum locks or linear slide position in coffee makers. IC Role / Device Role / Timing Role: Latched position indicator maintaining state between magnet passes for absolute position memory. Use Value: ±40G sensitivity allows use of small, low-cost ferrite magnets; SIP-3 package withstands mechanical shock during appliance operation. |
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 | Successor device with identical pinout, same 3.0–28V range, but improved Bop/Brp tolerance (±15G vs ±20G) and lower IDD (2.5mA typ vs 3mA). | Recommended for new designs per Diodes' notice; supports same motor commutation and flow meter use cases with tighter magnetic specs. | Select AH3724 for production ramp or design refreshes requiring extended lifecycle support and enhanced temperature stability. |
| AL3774 (Diodes) | Same die, different marking - functionally identical to AH3774 but designated for specific customer programs; no electrical or packaging differences. | No functional distinction; used only in legacy OEM BOMs with alternate part numbering conventions. | Use only if mandated by existing design documentation; not available for new sourcing without program authorization. |
Compared with AH3774-P-B, AH3724 offers tighter magnetic thresholds and lower quiescent current for next-gen designs, while AL3774 provides identical performance under alternate branding - making AH3774-P-B optimal for sustaining legacy industrial appliance production where form-fit-function match is mandatory.
Availability
AH3774-P-B is available at Aetrix Electronics and suitable for brushless DC motor commutation, flow metering, and linear position sensing requiring stable component supply across extended temperature and voltage ranges.
Supply support for AH3774-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 high-reliability power management, signal integrity, and sensing solutions for industrial and consumer markets.
The AH3774 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, high-voltage magnetic position detection in cost-sensitive, high-volume motor and metering applications.
FAQ
What is the magnetic polarity requirement for AH3774-P-B activation?
The AH3774-P-B uses SIP-3 (Bulk Pack) packaging, which requires the South pole to be presented to the part marking side for output turn-on. This is confirmed in the datasheet's magnetic polarity diagram and pin assignment section for SIP-3 packages. Applying North pole to the marked side releases the latch.
Does AH3774-P-B require an external capacitor on VDD?
Yes - a 10nF to 100nF ceramic decoupling capacitor (CIN) is recommended between VDD and GND per the Typical Applications Circuit. This stabilizes the internal bandgap regulator and enhances RF noise immunity, especially in motor drive environments with high dv/dt transients.
Can AH3774-P-B be used in automotive applications?
No - AH3774-P-B is not AEC-Q100 qualified and is explicitly excluded from automotive use in the datasheet's notes. Diodes states that automotive-grade variants require separate qualification, PPAP capability, and IATF 16949 manufacturing - none of which apply to this part number.
What is the maximum continuous output current rating?
The AH3774-P-B has a guaranteed output current limit (IOCL) of 30–55mA, as specified in Electrical Characteristics. This is enforced by internal circuitry and applies continuously when the output is actively sinking current - critical for driving LED indicators or small relay coils without external current limiting.
AH3774-P-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP Module
- Packaging:
- Bulk
- 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-B FAQ
1.How can I place an order for AH3774-P-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3774-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 AH3774-P-B reliable?
The price and inventory of AH3774-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 AH3774-P-B is usually 5 days.
3.What payment methods are accepted for AH3774-P-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3774-P-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3774-P-B?
AH3774-P-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3774-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 AH3774-P-B?
For technical support, including AH3774-P-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3774-P-B requirements.
6.How does Aetrix verify that AH3774-P-B is sourced from the original manufacturer or authorized distributors?
All AH3774-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 AH3774-P-B meets industry standards.
7.What is the process for return or replacement of AH3774-P-B?
All AH3774-P-B units undergo pre-shipment inspection (PSI). If there is an issue with AH3774-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 AH3774-P-B part is unused and in its original packaging.
Return procedure for AH3774-P-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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