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Diodes Incorporated AH3725Q-P-B
- Part No.:
- AH3725Q-P-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH3725Q-P-B.pdf
- Description:
- HALL LATCH SWITCH SIP-3 BULK 1K
- Quantity:
- Payment:
- Shipping:
Inventory:3,261
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Product details
Overview
AH3725Q-P-B from Diodes Incorporated is an AEC-Q100 Grade 0 qualified automotive Hall-effect bipolar latch IC designed for position and speed sensing in brushless DC motor commutation, RPM measurement, and angular/linear encoders. It operates from 3.0V to 28V, features ±50G to ±90G magnetic operate/release points (BOP/BRP), 140G typical hysteresis, and a single open-drain output with 30–55mA current limit-enabling robust contactless sensing in engine control modules and transmission position systems.
For engineers reviewing the AH3725Q-P-B datasheet, AH3725Q-P-B pinout, AH3725Q-P-B application, or AH3725Q-P-B equivalent, key selection criteria include its high-voltage tolerance (28V operating, 32V transient), chopper-stabilized temperature stability (−40°C to +150°C), South-on/North-off latching polarity, and SIP-3 package compatibility with automotive PCB layouts requiring high ESD immunity (8kV HBM) and reverse supply protection.
Technical Context
The AH3725Q-P-B implements a chopper-stabilized architecture with dynamic offset cancellation, delivering minimal switch-point drift (<±0.5G/°C typical) and superior immunity to mechanical stress and thermal gradients across −40°C to +150°C. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, ensuring stable BOP/BRP thresholds over full voltage (3–28V) and temperature ranges.
It integrates a reverse-blocking diode and zener clamp on VDD, plus output overcurrent limiting and zener clamping-enabling direct connection to noisy 12V/24V automotive rails without external protection. The open-drain output switches low when perpendicular magnetic flux exceeds +70G (BOP typ) and remains latched until flux reverses below −70G (BRP typ), supporting precise edge detection in rotating target applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - supports direct connection to 12V/24V automotive battery rails with transient tolerance up to 32V. |
| BOP / BRP (Typ) | +70G / −70G - enables reliable switching with moderate-strength magnets at air gaps up to 2.5mm in BLDC rotor position sensing. |
| Hysteresis (Typ) | 140G - prevents chatter in vibrating environments such as engine-mounted crankshaft position sensors. |
| Output Type | Open-drain with 30–55mA current limit - allows flexible pull-up to 5V/12V/24V and drives standard logic or optocoupler inputs directly. |
| Operating Temperature | −40°C to +150°C - qualified for under-hood placement in powertrain control units and transmission control modules. |
| ESD Rating | 8kV HBM, 1kV CDM - meets automotive system-level ESD requirements without additional protection circuitry. |
| Startup Time | 10µs typical - ensures rapid sensor readiness after ignition power-up, critical for engine start-stop timing. |
Pinout & Package
Package: SIP-3 (Bulk Pack) - surface-mount, 3-pin single-inline package with gull-wing leads, optimized for automated placement and reflow in automotive production.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power input with integrated reverse-blocking diode and 28V zener clamp - tolerates load-dump transients and reversed battery connection. |
| 2 | GND | Ground reference for internal regulator and output stage - requires low-impedance PCB return path to minimize noise coupling. |
| 3 | OUTPUT | Open-drain output with 30–55mA current limit and zener clamp - sinks current when active; requires external pull-up for logic-level interface. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized architecture | Reduces offset drift to <±0.5G/°C, enabling stable switching thresholds across full automotive temperature range. |
| Bipolar latch operation | South pole activates output (low), North pole releases - supports bidirectional magnetic field detection in rotary encoder wheels. |
| Integrated supply protection | Reverse-blocking diode + 28V zener clamp on VDD eliminates need for external TVS or diode in 12V/24V systems. |
| High ESD immunity | 8kV HBM rating allows handling and assembly without special ESD controls in Tier-1 manufacturing lines. |
| AEC-Q100 Grade 0 qualification | Validated for 150°C ambient operation - suitable for placement near engines, transmissions, and power inverters. |
Applications
| BLDC Motor Commutation | RPM Measurement |
|---|---|
Use Scenario: Detecting rotor magnet position in 3-phase brushless DC motors for electronic throttle control and HVAC blower fans. IC Role / Device Role / Timing Role: Bipolar latch providing synchronized commutation signals to gate drivers with <10µs startup latency. Use Value: Enables precise 120° electrical phase alignment using only two sensors per motor, reducing BOM cost vs. resolver-based solutions. |
Use Scenario: Measuring rotational speed of crankshafts, camshafts, or turbocharger shafts in ICE and hybrid powertrains. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector generating clean digital pulses at frequencies up to 50kHz. Use Value: Delivers jitter <1µs due to chopper stabilization, improving engine control unit (ECU) timing resolution for fuel injection timing. |
| Transmission Position Sensing | Linear Flow Meter Indexing |
Use Scenario: Gear selector position feedback in automatic transmissions using ferrous target plates mounted on shift forks. IC Role / Device Role / Timing Role: Latched Hall switch detecting discrete gear positions with hysteresis to reject vibration-induced false triggers. Use Value: 140G hysteresis prevents misreads during harsh gear engagement shocks, meeting ASIL-B functional safety requirements. |
Use Scenario: Turbine or piston movement detection in automotive fuel or coolant flow meters with rotating vanes. IC Role / Device Role / Timing Role: Edge-triggered position sensor converting vane passage into pulse train for volumetric flow calculation. Use Value: 3.0V–28V operation allows direct integration into 5V microcontroller domains or 24V industrial flow meter controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Allegro A1220LUA-T | Lower sensitivity (BOP ±35G typ), 5V-only supply, SOIC-8 package - lacks high-voltage capability and AEC-Q100 Grade 0 rating. | Suitable for non-automotive consumer BLDC fans but not under-hood engine control due to 125°C max junction temperature. | Select AH3725Q-P-B for 24V systems, extended temperature, or AEC-Q100 compliance; choose A1220LUA-T only for cost-sensitive 5V board-level designs. |
| Melexis US1881EUA-ABA-000-SP | Higher sensitivity (BOP ±25G typ), 3.5–24V range, same SIP-3 package - narrower voltage range and no reverse-supply protection diode. | Used in steering angle sensors where ultra-low BOP is needed, but requires external reverse-polarity protection in 24V trucks. | AH3725Q-P-B is preferred for heavy-duty commercial vehicle applications requiring reverse-battery immunity and 28V operation headroom. |
Compared with A1220LUA-T and US1881EUA-ABA-000-SP, the AH3725Q-P-B uniquely combines 28V operation, integrated reverse-supply protection, AEC-Q100 Grade 0 qualification, and 140G hysteresis-making it the only option qualified for direct use in engine control modules without supplemental protection circuitry.
Availability
AH3725Q-P-B is available at Aetrix Electronics and suitable for automotive powertrain control, transmission position sensing, and BLDC motor commutation requiring stable component supply across long production lifecycles and IATF 16949-compliant manufacturing.
Supply support for AH3725Q-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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal devices for automotive, industrial, and computing markets, with ISO/TS 16949-certified wafer fabs and assembly facilities.
The AH3725Q-P-B belongs to the AH372XQ family of AEC-Q100 qualified Hall-effect latches engineered specifically for high-reliability automotive position and speed sensing-emphasizing wide voltage range, extreme temperature resilience, and integrated protection for under-hood deployment.
FAQ
What is the magnetic polarity requirement for AH3725Q-P-B activation?
The AH3725Q-P-B uses a South-pole-on / North-pole-off latching mechanism. For the SIP-3 (Bulk Pack) variant, a South pole applied to the marked side of the package activates the output (pulls low); reversal to North pole releases it. This polarity behavior is fixed per package type and cannot be inverted via configuration pins.
Does AH3725Q-P-B require an external capacitor on the VDD pin?
Yes-a 10nF to 100nF ceramic decoupling capacitor (CIN) is required between VDD and GND, placed as close as possible to the device. This stabilizes the internal bandgap regulator, improves noise immunity against RF interference, and ensures reliable startup within the specified 10µs time.
Can AH3725Q-P-B drive an LED directly?
No-the open-drain output is rated for 30–55mA continuous sink current but lacks internal current regulation. Driving an LED directly risks exceeding absolute maximum ratings if forward voltage and series resistance are not precisely calculated. Use an external current-limiting resistor or buffer transistor for LED interfacing.
Is AH3725Q-P-B compatible with SC59 or SOT23 packages?
No-AH3725Q-P-B is specifically the SIP-3 (Bulk Pack) variant. While the AH372XQ family includes SC59 and SOT23 (Type S) versions, the "-P-B" suffix denotes SIP-3 packaging with distinct pin orientation and magnetic polarity direction (South pole to part marking side). Mechanical and magnetic mounting must follow SIP-3 layout guidelines.
AH3725Q-P-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Latch, Bipolar Switch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- ±6mT Trip, ±0.5mT Release
- Test Condition:
- 25°C
- Voltage - Supply:
- 2.2V ~ 20V
- Current - Supply (Max):
- 4mA
- Current - Output (Max):
- 25mA
- Output Type:
- Digital
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH3725Q-P-B FAQ
1.How can I place an order for AH3725Q-P-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3725Q-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 AH3725Q-P-B reliable?
The price and inventory of AH3725Q-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 AH3725Q-P-B is usually 5 days.
3.What payment methods are accepted for AH3725Q-P-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3725Q-P-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3725Q-P-B?
AH3725Q-P-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3725Q-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 AH3725Q-P-B?
For technical support, including AH3725Q-P-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3725Q-P-B requirements.
6.How does Aetrix verify that AH3725Q-P-B is sourced from the original manufacturer or authorized distributors?
All AH3725Q-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 AH3725Q-P-B meets industry standards.
7.What is the process for return or replacement of AH3725Q-P-B?
All AH3725Q-P-B units undergo pre-shipment inspection (PSI). If there is an issue with AH3725Q-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 AH3725Q-P-B part is unused and in its original packaging.
Return procedure for AH3725Q-P-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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