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Diodes Incorporated AH3723Q-P-B
- Part No.:
- AH3723Q-P-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH3723Q-P-B.pdf
- Description:
- HALL LATCH SWITCH SIP-3 BULK 1K
- Quantity:
- Payment:
- Shipping:
Inventory:3,840
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Product details
Overview
AH3723Q-P-B from Diodes Incorporated is an AEC-Q100 Grade 0 qualified automotive Hall-effect bipolar latch IC for brushless DC motor commutation and angular position sensing. It operates from 3.0V to 28V, features ±30G typical operate/release points (BOP/BRP), 60 mA output current limit, and -40°C to +150°C operation-deployed in engine camshaft/crankshaft position detection systems.
For engineers reviewing the AH3723Q-P-B datasheet, AH3723Q-P-B pinout, AH3723Q-P-B application, or AH3723Q-P-B equivalent, key selection criteria include magnetic sensitivity tolerance over temperature, open-drain output drive capability under 28V supply, latch polarity alignment with package marking side, and AEC-Q100 qualification for under-hood deployment.
Technical Context
The AH3723Q-P-B uses chopper-stabilized architecture with dynamic offset cancellation to suppress thermal drift and mechanical stress-induced errors, enabling stable switching thresholds across -40°C to +150°C. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, ensuring consistent BOP/BRP hysteresis of 60G (typ) over full voltage and temperature range.
Magnetic polarity response is package-dependent: SOT23 (Type S) and SIP-3 require South pole on the part-marking side for turn-on, while SC59 requires South pole on the non-marking side. The single open-drain output includes overcurrent limiting (30–55 mA) and zener clamping (28V), with 10 µs startup time after VDD reaches 3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 28V - supports direct battery connection in 12V/24V automotive systems without external regulation. |
| BOP / BRP (Typ) | +30G / -30G - enables reliable latching with low-strength magnets in space-constrained encoders or gear tooth sensors. |
| Output Type | Open-drain - allows flexible pull-up to any voltage ≤32V and wired-OR interfacing with microcontroller GPIOs. |
| Output Current Limit | 30–55 mA - protects against short-circuit faults while driving typical 1–10 kΩ pull-up loads. |
| Operating Temperature | -40°C to +150°C - validated for placement near engines, transmissions, and power inverters per AEC-Q100 Grade 0. |
| ESD Robustness | HBM: 8 kV, CDM: 1 kV - exceeds automotive ESD immunity requirements for assembly and field operation. |
| Startup Time | 10 µs (typ) - ensures rapid system readiness after ignition power-up, critical for real-time RPM measurement. |
Pinout & Package
Package: SC59 - industry-standard 3-pin surface-mount package with gull-wing leads, optimized for automated placement and reflow soldering in automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive supply input | Accepts 3.0–28V; includes reverse-blocking diode and zener clamp (28V) for load-dump and jump-start protection. |
| 2 - GND | Ground reference | Return path for internal regulator, Hall sensor, and output stage; must be low-impedance for noise immunity. |
| 3 - OUTPUT | Open-drain output | Sinks up to 55 mA when active (low); requires external pull-up; clamped to 28V during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper stabilization | Reduces switch-point drift to <±0.5G/°C, enabling stable timing in camshaft position sensing over full temperature range. |
| Bipolar latch logic | South pole turns output ON (low), North pole releases it OFF - eliminates need for external polarity inversion in BLDC rotor tracking. |
| Integrated supply protection | Reverse-blocking diode + 28V zener clamp withstands -18V reverse supply and ISO 7637-2 pulse 5a transients. |
| High ESD immunity | 8 kV HBM rating prevents latch-up or parametric shift during handling and in-vehicle ESD events. |
| AEC-Q100 Grade 0 | Qualified for 150°C ambient operation with PPAP documentation support - meets OEM requirements for engine bay placement. |
Applications
| Engine Camshaft Position Sensing | BLDC Motor Commutation |
|---|---|
|
Use Scenario: Detecting camshaft rotation angle in gasoline/diesel engines for variable valve timing control. IC Role / Device Role / Timing Role: Bipolar latch provides digital edge-triggered signal synchronized to ferrous target teeth; hysteresis prevents chatter at threshold crossings. Use Value: ±30G BOP/BRP enables use with small, low-cost magnets mounted directly on cam sprockets - reducing mechanical complexity vs. differential sensors. |
Use Scenario: Six-step commutation sequencing for 3-phase brushless DC motors in electric power steering (EPS) and HVAC blowers. IC Role / Device Role / Timing Role: Latched Hall output delivers deterministic rotor position state (0°/60°/120° etc.) to MCU for precise MOSFET gate timing. Use Value: 10 µs startup time ensures immediate rotor position availability at motor enable - eliminating spin-up delay in safety-critical EPS systems. |
| Transmission Gear Tooth Detection | Wheel Speed Sensing (Non-ABS) |
|
Use Scenario: Monitoring gear engagement status and rotational speed in automatic transmission valve body assemblies. IC Role / Device Role / Timing Role: Latch output toggles per gear tooth passage; output remains stable between transitions for clean microcontroller sampling. Use Value: 28V absolute max rating allows direct connection to 24V transmission control module supplies - avoiding level-shifting circuitry. |
Use Scenario: Measuring rotational speed of non-driven wheels (e.g., idler or accessory pulleys) for diagnostic monitoring. IC Role / Device Role / Timing Role: Converts magnetic flux changes from rotating steel target into clean square-wave RPM signal for ECU logging. Use Value: -40°C to +150°C operation ensures reliability in under-hood environments where ambient can exceed 125°C near exhaust manifolds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL3723QTR | Same BOP/BRP specs and AEC-Q100 Grade 0, but in SOT23-3 (Type S) package with opposite magnetic polarity orientation. | Requires South pole on part-marking side (vs. non-marking side for AH3723Q-P-B's SC59), affecting magnet mounting direction in existing layouts. | Select when board layout uses SOT23 footprint and magnet placement aligns with marking-side activation. |
| TLE4963-2M | Higher BOP/BRP (±40G typ), integrated reverse-polarity protection, but no zener clamp on VDD and only AEC-Q100 Grade 1 (-40°C to +125°C). | Limited to lower-temperature zones (e.g., cabin modules); lacks 150°C capability required for engine bay placement. | Choose only for non-under-hood applications where extended temperature range is not required. |
Compared with AL3723QTR and TLE4963-2M, AH3723Q-P-B uniquely combines SC59 package robustness, 150°C operation, and 28V zener clamping - making it the only option qualified for high-temperature, high-transient automotive locations like cylinder heads and turbo housings.
Availability
AH3723Q-P-B is available at Aetrix Electronics and suitable for engine position sensing, BLDC motor commutation, transmission speed monitoring, and wheel speed diagnostics requiring stable component supply across automotive production lifecycles.
Supply support for AH3723Q-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 company specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and computing markets.
The AH372XQ series belongs to Diodes' AEC-Q100-qualified Hall-effect sensor product line, engineered specifically for contactless position and speed sensing in harsh automotive environments.
FAQ
What is the magnetic polarity requirement for AH3723Q-P-B activation?
The AH3723Q-P-B in SC59 package requires a South pole applied to the non-part-marking side to turn the output ON. This is inverted relative to SOT23/SIP-3 variants. Polarity misalignment causes failure to latch - verify magnet orientation using the top-view pin 1 (VDD) corner as reference per datasheet Figure 1.
Can AH3723Q-P-B operate directly from a 24V truck battery?
Yes. AH3723Q-P-B supports 3.0V to 28V continuous operation and includes a 28V zener clamp on VDD. It withstands ISO 7637-2 Load Dump pulses up to 32V transient (non-operational stress rating) and reverse battery conditions down to -18V via its integrated blocking diode.
Does AH3723Q-P-B require an external capacitor on VDD?
Yes. A 10nF–100nF ceramic decoupling capacitor (CIN) is mandatory between VDD and GND, placed as close as possible to the device pins. This stabilizes the internal bandgap regulator and improves RF noise immunity - omission causes erratic switching or failure to start.
How does the chopper stabilization improve performance in automotive use?
Chopper stabilization actively cancels offset voltage drift caused by temperature gradients and mechanical stress. In AH3723Q-P-B, this reduces BOP/BRP variation to <±0.5G/°C - ensuring consistent camshaft timing accuracy across -40°C cold starts and +150°C under-hood operation without calibration.
AH3723Q-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
AH3723Q-P-B FAQ
1.How can I place an order for AH3723Q-P-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3723Q-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 AH3723Q-P-B reliable?
The price and inventory of AH3723Q-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 AH3723Q-P-B is usually 5 days.
3.What payment methods are accepted for AH3723Q-P-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3723Q-P-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3723Q-P-B?
AH3723Q-P-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3723Q-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 AH3723Q-P-B?
For technical support, including AH3723Q-P-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3723Q-P-B requirements.
6.How does Aetrix verify that AH3723Q-P-B is sourced from the original manufacturer or authorized distributors?
All AH3723Q-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 AH3723Q-P-B meets industry standards.
7.What is the process for return or replacement of AH3723Q-P-B?
All AH3723Q-P-B units undergo pre-shipment inspection (PSI). If there is an issue with AH3723Q-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 AH3723Q-P-B part is unused and in its original packaging.
Return procedure for AH3723Q-P-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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