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Diodes Incorporated AH3712-P-B
- Part No.:
- AH3712-P-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- 3-SIP
- Datasheet:
-
AH3712-P-B.pdf
- Description:
- HALL LATCH SWITCH SIP-3 BULK 1K
- Quantity:
- Payment:
- Shipping:
Inventory:306
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Product details
Overview
AH3712-P-B from Diodes Incorporated is a high-voltage, high-sensitivity Hall effect latch IC designed for brushless DC motor commutation and position sensing in industrial appliances and personal care devices. It operates from 3.0V to 27V, features ±25G typical operate/release points (BOP/BRP), includes chopper-stabilized architecture for temperature stability, and delivers open-drain output with 60mA current limit and 0.25V on-state voltage at 20mA.
For engineers reviewing the AH3712-P-B datasheet, AH3712-P-B pinout, AH3712-P-B application, or AH3712-P-B equivalent, this device supports robust magnetic sensing in high-temperature (–40°C to +125°C), high-voltage transient (40V load dump), and ESD-prone environments - critical for motor control, flow metering, and contactless RPM measurement circuits.
Technical Context
The AH3712-P-B implements a chopper-stabilized Hall sensor with dynamic offset cancellation, delivering stable BOP/BRP thresholds across –40°C to +125°C and supply voltages from 3.0V to 27V. Its internal bandgap regulator supplies temperature-compensated bias to all subcircuits, minimizing switch-point drift.
It uses bipolar latching logic: South pole triggers output low (active), North pole releases it - confirmed for SIP-3 package orientation per datasheet marking diagram. The single open-drain output includes integrated overcurrent limiting (30–60mA) and exhibits 13µs start-up time after VDD reaches 3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.0V to 27V - enables direct integration into 12V/24V industrial power rails without external regulation. |
| Operate Point (BOP) | ±25G typical - ensures reliable switching with common ferrite or NdFeB magnets at air gaps up to 2.5mm. |
| Release Point (BRP) | ±25G typical with 50G hysteresis - prevents chatter in noisy magnetic fields or mechanical vibration. |
| Output Type | Open-drain - allows flexible pull-up selection (external or internal in AH3712A variant) and wired-OR interfacing. |
| Output Current Limit | 30–60mA - protects against short-circuit faults while driving standard LED indicators or MOSFET gates directly. |
| Start-Up Time | 13µs typical - guarantees fast system response after power-on, supporting high-RPM motor commutation (>75k RPM). |
| ESD Rating | HBM: 8kV, CDM: 1kV - meets IEC 61000-4-2 Level 4 requirements for industrial end-equipment robustness. |
Pinout & Package
Package: SIP-3 (Bulk Pack), 3-pin straight-lead through-hole package with 14.5mm body length and 3.0mm lead pitch. RoHS-compliant, halogen-free, and lead-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Positive supply input - accepts 3.0V–27V; withstands 40V transient load dump per absolute max rating. |
| 2 | GND | Ground reference - connects to system common; required for internal bandgap regulator and chopper stabilization. |
| 3 | OUTPUT | Open-drain output - sinks up to 60mA; requires external pull-up for logic-high state; clamped by internal Zener (36V). |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized architecture | Reduces thermal drift of BOP/BRP to <±0.5G/°C - eliminates need for external compensation in wide-temperature designs. |
| Bipolar latching logic (South-On/North-Off) | Enables precise angular position detection in BLDC rotors without additional decoding logic or microcontroller polling. |
| 40V transient tolerance (load dump) | Permits direct use in automotive-adjacent industrial systems (e.g., power tools, HVAC blowers) without external TVS diodes. |
| 13µs start-up time | Supports real-time commutation in motors spinning >75,000 RPM - faster than competing latches requiring >50µs initialization. |
| –40°C to +125°C operation | Validated across full range with no derating - suitable for sealed motor housings and embedded appliance control modules. |
Applications
| BLDC Motor Commutation | Flow Meter Sensing |
|---|---|
|
Use Scenario: Detecting rotor magnet polarity in 3-phase brushless DC fans used in server cooling and industrial blowers. IC Role / Device Role / Timing Role: Hall latch providing synchronized commutation signals to gate drivers, replacing mechanical brushes and enabling >90% efficiency. Use Value: ±25G sensitivity ensures reliable triggering at 1.5mm air gap; 27V operation supports direct connection to 24V bus without LDO. |
Use Scenario: Measuring fluid velocity in residential water meters using rotating impeller with embedded magnets. IC Role / Device Role / Timing Role: Magnetic zero-crossing detector generating pulse train proportional to flow rate for MCU-based metering. Use Value: 50G hysteresis prevents false counts from vibration; 8kV HBM ESD rating survives field installation handling. |
| Linear Encoder Position | Personal Care Appliance Speed Control |
|
Use Scenario: Detecting linear displacement in automated window blinds or CNC tool positioning via magnet array on moving rail. IC Role / Device Role / Timing Role: Bipolar latch capturing direction and position via alternating South/North transitions along track. Use Value: 13µs start-up and 10µs magnetic response enable 10kHz position update rates; SIP-3 package simplifies through-hole assembly. |
Use Scenario: RPM feedback in cordless hair dryers and electric toothbrushes with compact brushed/BLDC motors. IC Role / Device Role / Timing Role: Commutation sensor enabling closed-loop speed regulation and battery-efficient torque delivery. Use Value: 3.0V minimum supply allows operation down to single-cell Li-ion (3.2V nominal); 0.25V VON minimizes power loss in high-duty-cycle use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Allegro A1220LLHLT-T | Wider BOP range (±35G min), but only rated to 24V supply and lacks 40V load-dump tolerance. | Not suitable for 27V industrial systems or automotive-adjacent surge environments without external protection. | Select when higher magnetic immunity is needed and supply stays ≤24V; avoid where 40V transients occur. |
| Melexis US1881EUA-ABA-000-RE | Lower sensitivity (±30G min), 3.3V–24V range, and no specified load-dump rating - relies on external TVS. | Lacks integrated overcurrent limit and has slower 25µs start-up, limiting use in high-RPM commutation. | Prefer for cost-sensitive consumer applications with stable 12V supplies and no surge exposure. |
Compared with AH3712-P-B, A1220LLHLT-T offers higher magnetic margin but sacrifices voltage ruggedness, while US1881EUA-ABA-000-RE reduces system BOM cost at the expense of transient resilience and dynamic response - making AH3712-P-B optimal for demanding industrial motion control.
Availability
AH3712-P-B is available at Aetrix Electronics and suitable for brushless DC motor commutation, flow metering, linear encoder position sensing, and personal care appliance speed control requiring stable component supply across extended temperature and voltage ranges.
Supply support for AH3712-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.
AH3712-P-B belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust magnetic position and speed sensing in harsh environments - emphasizing voltage tolerance, thermal stability, and ESD resilience.
FAQ
What is the magnetic polarity behavior of AH3712-P-B?
AH3712-P-B is a South-pole-on, North-pole-off bipolar latch. When a South pole with sufficient flux density (>BOP = ±25G typical) approaches the marked side of the SIP-3 package, the open-drain output switches low. It remains latched until a North pole ( No. AH3712-P-B has an open-drain output and requires an external pull-up resistor. Only the AH3712A variant includes an internal 10–18kΩ pull-up (per Electrical Characteristics table, page 4). This distinction is encoded in the orderable part number suffix: blank = open-drain, "A" = internal pull-up. Yes. Its absolute maximum VDD rating is 40V transient (page 3), explicitly defined as load dump tolerance. While not AEC-Q100 qualified (that requires AH3712Q), its 40V rating, –40°C to +125°C operation, and 8kV HBM ESD make it suitable for non-safety-critical automotive-adjacent industrial applications like power tools and HVAC actuators. A 10nF to 100nF ceramic capacitor (CIN) between VDD and GND is recommended for power stabilization and noise immunity (page 2, Typical Applications Circuit note 4). This value suppresses high-frequency ripple from motor commutation or switching supplies without compromising 13µs start-up time.Does AH3712-P-B include internal pull-up resistance?
Can AH3712-P-B withstand automotive load dump conditions?
What is the recommended bypass capacitor for AH3712-P-B?
AH3712-P-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-SIP
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Latch
- Technology:
- Hall Effect
- Polarization:
- South Pole
- Sensing Range:
- 4mT Trip, -4mT Release
- Test Condition:
- -40°C ~ 125°C
- Voltage - Supply:
- 3V ~ 27V
- Current - Supply (Max):
- 4.8mA
- Current - Output (Max):
- 60mA
- Output Type:
- Open Drain
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 3-SIP
AH3712-P-B FAQ
1.How can I place an order for AH3712-P-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AH3712-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 AH3712-P-B reliable?
The price and inventory of AH3712-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 AH3712-P-B is usually 5 days.
3.What payment methods are accepted for AH3712-P-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3712-P-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH3712-P-B?
AH3712-P-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH3712-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 AH3712-P-B?
For technical support, including AH3712-P-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3712-P-B requirements.
6.How does Aetrix verify that AH3712-P-B is sourced from the original manufacturer or authorized distributors?
All AH3712-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 AH3712-P-B meets industry standards.
7.What is the process for return or replacement of AH3712-P-B?
All AH3712-P-B units undergo pre-shipment inspection (PSI). If there is an issue with AH3712-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 AH3712-P-B part is unused and in its original packaging.
Return procedure for AH3712-P-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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