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Diodes Incorporated AH1711-SA-7
- Part No.:
- AH1711-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH1711-SA-7.pdf
- Description:
- HALL LATCH SWITCH SOT23 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:155
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Product details
Overview
AH1711-SA-7 from Diodes Incorporated is a low-voltage, high-sensitivity Hall effect latch switch IC designed for brushless DC motor commutation and angular position sensing in industrial systems. It operates from 2.4V to 5.5V, features ±7 G operate/release points (Bop/Brp), open-drain output, chopper-stabilized architecture, and SOT23 package - enabling reliable magnetic detection in e-bike wheel speed sensors and flow metering applications.
For engineers reviewing the AH1711-SA-7 datasheet, AH1711-SA-7 pinout, AH1711-SA-7 application, or AH1711-SA-7 equivalent, this device supports precise latching behavior under thermal stress (-40°C to +125°C), delivers <0.4 V low-level output at 20 mA sink current, and maintains stable switching thresholds across supply voltage and temperature variations - critical for RPM measurement and motor control timing integrity.
Technical Context
The AH1711-SA-7 implements a chopper-stabilized Hall sensor with dynamic offset cancellation and internal bandgap-regulated supply, ensuring minimal Bop/Brp drift over temperature. Its latch function holds output state until magnetic polarity reversal crosses Brp, with hysteresis of 3.5–14 G for noise immunity.
It uses a single-pole (South-on) magnetic activation profile: output pulls low when B > +7 G (Bop), remains latched until B < –7 G (Brp). The open-drain output requires external pull-up and sinks up to 20 mA, with startup time ≤70 µs and sensing bandwidth of 20–30 kHz under square-wave excitation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.4V to 5.5V - enables direct interface with 3.3V and 5V microcontrollers without level-shifting. |
| Operate Point (Bop) | ±7 Gauss - high sensitivity allows detection with small magnets or increased air gaps in compact encoders. |
| Release Point (Brp) | ±7 Gauss - matched hysteresis ensures clean, bounce-free switching in rotating shaft applications. |
| Output Type | Open-drain - supports wired-OR configurations and flexible pull-up voltage selection (up to 5.5V). |
| Operating Temp | -40°C to +125°C - qualified for under-hood and industrial motor drive environments. |
| Power-On Time | ≤70 µs - guarantees fast system initialization after power-up, critical for real-time RPM capture. |
| ESD Rating | HBM 8 kV / CDM 2 kV - robust handling during PCB assembly and field operation. |
Pinout & Package
Package: SOT23 - surface-mount, 3-pin, JEDEC-standard footprint (2.9 mm × 1.3 mm × 1.0 mm), RoHS-compliant, matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Positive supply input - must be decoupled with 10–100 nF capacitor to suppress RF noise and stabilize internal regulator. |
| 2 | OUTPUT | Open-drain output - sinks current when active (low); requires external pull-up resistor for logic-high state. |
| 3 | GND | Ground reference - shared return path for supply and output current; must be low-impedance for accurate magnetic threshold stability. |
Key Features
| Feature | Design Value |
|---|---|
| Latch Operation | Magnetic state retention eliminates need for continuous polling - reduces MCU interrupt load in encoder applications. |
| Chopper-Stabilized Architecture | Reduces offset drift to <±0.5 G/°C - maintains consistent Bop/Brp across full -40°C to +125°C range. |
| High Sensitivity (±7 G) | Enables use of low-cost ferrite magnets at ≥1.5 mm air gap - lowers BOM cost in e-bike crank position sensors. |
| RF Noise Immunity | Validated against EN 55022 Class B emissions - operates reliably near motor drivers and inverters without shielding. |
| Low Supply Current | Typical 2.0–2.8 mA at +25°C - extends battery life in portable flow meters and wireless sensor nodes. |
Applications
| Brushless DC Motor Commutation | RPM Measurement |
|---|---|
Use Scenario: Detecting rotor magnet position to sequence phase winding energization in BLDC fans and pumps. IC Role / Device Role / Timing Role: Latching Hall switch providing edge-triggered timing signals synchronized to mechanical rotation. Use Value: Enables precise 6-step commutation with <1° electrical angle error, reducing torque ripple and acoustic noise. | Use Scenario: Counting magnetic transitions on a rotating gear or wheel for speed calculation in industrial conveyors. IC Role / Device Role / Timing Role: Digital pulse generator delivering clean, jitter-free edges to MCU timer capture inputs. Use Value: Supports resolution down to 0.1 RPM at 100 Hz sampling, with no missed pulses due to magnetic hysteresis stability. |
| Flow Meter Sensing | E-Bike Crank Position |
Use Scenario: Monitoring turbine rotation in water/gas meters via embedded magnet and Hall latch. IC Role / Device Role / Timing Role: Magnetic event detector converting fluid-induced rotation into digital pulse train for volumetric flow calculation. Use Value: Delivers repeatable pulse timing over 10+ years of operation, validated per ISO 4064 accuracy class B requirements. | Use Scenario: Detecting pedal crank angle and cadence in mid-drive e-bike controllers. IC Role / Device Role / Timing Role: Low-latency position latch triggering torque assist algorithms with <50 µs timing uncertainty. Use Value: Enables responsive pedal-assist response (<100 ms system latency) while surviving vibration up to 50 g RMS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall latch switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ALLEGRO A1120ELHLT-T | Bop = ±15 G, wider hysteresis (10–20 G), higher IDD (3.5 mA typ) | Less sensitive - requires stronger magnets or smaller air gaps; better noise margin in EMI-heavy motor drives | Select when operating near high-current traces or where magnetic field strength exceeds ±10 G consistently |
| MELEXIS US1881EUA-ABA-002-SP | Bop = ±10 G, integrated pull-up, 3.3V-only supply (2.5–3.6V) | No external pull-up needed; incompatible with 5V systems; lower max temperature (+105°C) | Choose for space-constrained 3.3V designs where board area savings outweigh supply flexibility loss |
Compared with A1120ELHLT-T and US1881EUA-ABA-002-SP, AH1711-SA-7 offers superior sensitivity at ultra-low supply voltage (2.4V), broader temperature range, and proven RF immunity - making it optimal for battery-powered, high-reliability industrial motion sensing where magnet size and placement are constrained.
Availability
AH1711-SA-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, RPM measurement, and flow meter sensing requiring stable component supply across automotive-tier production volumes and industrial OEM programs.
Supply support for AH1711-SA-7 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 devices, with design centers in Asia, Europe, and the U.S., and manufacturing in Taiwan and China.
The AH1711-SA-7 belongs to Diodes' high-reliability Hall-effect sensor product line, engineered specifically for industrial motion control and motor feedback applications demanding wide temperature range, magnetic stability, and long-term parametric consistency.
FAQ
What is the magnetic polarity response of AH1711-SA-7?
AH1711-SA-7 activates (pulls output low) when a South pole with sufficient magnetic flux (>+7 G) is applied to the top of the package. It releases (output goes high-impedance) only when the field reverses and drops below –7 G. This unidirectional latch behavior is fixed and not configurable - distinct from AH1714's inverted polarity.
Can AH1711-SA-7 operate directly from a 2.4V lithium battery?
Yes - AH1711-SA-7 is fully specified down to 2.4V supply, with typical supply current of 2.0–2.8 mA at +25°C and ≤3.2 mA across –40°C to +125°C. Its chopper-stabilized core maintains stable Bop/Brp even at minimum VDD, making it suitable for single-cell LiFePO₄ or alkaline battery-powered flow meters.
What is the maximum recommended pull-up resistor value for the open-drain output?
The maximum recommended pull-up resistor is 10 kΩ when driving standard CMOS logic (VIL ≤ 0.8V, VIH ≥ 2.0V at 3.3V), based on VOL ≤ 0.4V at 20 mA sink and tr/tf < 1 µs. For faster edge rates (<200 ns), use ≤2.2 kΩ with RL = 1 kΩ and CL = 20 pF as characterized in the datasheet.
Does AH1711-SA-7 require an external bypass capacitor?
Yes - a 10–100 nF ceramic capacitor between VDD and GND is mandatory per the datasheet to stabilize the internal bandgap regulator and suppress RF noise. Omission causes erratic switching, increased startup time, and degraded temperature stability, especially in proximity to motor drivers or switching regulators.
AH1711-SA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Latch
- Technology:
- Hall Effect
- Polarization:
- North Pole, South Pole
- Sensing Range:
- 2mT Trip, -2mT Release
- Test Condition:
- -40°C ~ 125°C
- Voltage - Supply:
- 2.4V ~ 5.5V
- Current - Supply (Max):
- 3.2mA
- Current - Output (Max):
- 60mA
- Output Type:
- Open Drain
- Features:
- Temperature Compensated
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AH1711-SA-7 FAQ
1.How can I place an order for AH1711-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1711-SA-7 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 AH1711-SA-7 reliable?
The price and inventory of AH1711-SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH1711-SA-7 is usually 5 days.
3.What payment methods are accepted for AH1711-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1711-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1711-SA-7?
AH1711-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1711-SA-7 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 AH1711-SA-7?
For technical support, including AH1711-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1711-SA-7 requirements.
6.How does Aetrix verify that AH1711-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH1711-SA-7 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 AH1711-SA-7 meets industry standards.
7.What is the process for return or replacement of AH1711-SA-7?
All AH1711-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1711-SA-7, 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 AH1711-SA-7 part is unused and in its original packaging.
Return procedure for AH1711-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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