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Diodes Incorporated AH1712-SA-7
- Part No.:
- AH1712-SA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Switches (Solid State)
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AH1712-SA-7.pdf
- Description:
- HALL LATCH SWITCH SOT23 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:3,549
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Product details
Overview
AH1712-SA-7 from Diodes Incorporated is a low-voltage, high-sensitivity Hall effect latch switch optimized for brushless DC motor commutation and angular position sensing in industrial systems. It operates from 2.4V to 5.5V, features ±18 Gauss operate/release points (Bop/Brp), open-drain output, chopper-stabilized architecture, and functions across –40°C to +125°C.
For engineers reviewing the AH1712-SA-7 datasheet, AH1712-SA-7 pinout, AH1712-SA-7 application, or AH1712-SA-7 equivalent, this device supports precise magnetic threshold detection in RPM measurement, wheel speed sensing, flow metering, and e-bike motor control where latch polarity and thermal stability are critical.
Technical Context
The AH1712-SA-7 implements a chopper-stabilized Hall sensor with dynamic offset cancellation and an internal bandgap regulator, delivering stable switching thresholds over temperature. Its latch behavior requires magnetic reversal-South pole triggers output low (sinking), North pole releases it-enabling robust position state retention without external latching logic.
With 800 kHz chopping frequency, 38–70 µs power-on time, and guaranteed 23–36 Gauss hysteresis (BHY), the device suppresses mechanical bounce and thermal drift while maintaining immunity to supply noise and RF interference up to 8 kV HBM ESD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage | 2.4V to 5.5V - enables direct interface with 3.3V and 5V microcontrollers and battery-powered systems without level-shifting. |
| Operate Point (Bop) | +5 to +37 Gauss - detects weak magnetic fields typical of small ferrite magnets at air gaps up to 2 mm in motor rotor sensing. |
| Release Point (Brp) | –37 to –5 Gauss - ensures clean release with sufficient hysteresis to prevent chatter near threshold transitions. |
| Output Type | Open-drain - allows flexible pull-up to any voltage ≤6V and wired-OR configuration with other sensors. |
| Supply Current | 2.0–3.2 mA - ultra-low quiescent draw suitable for always-on industrial monitoring nodes. |
| Response Time | 10–20 µs - supports accurate RPM capture up to ~50 kHz (e.g., 3M RPM at 10-pole pairs). |
| ESD Rating | HBM ±8 kV - withstands handling and board-level electrostatic events in factory and field environments. |
Pinout & Package
Package: SOT23 - surface-mount, 3-pin, lead-free, RoHS-compliant package with 2.4 mm × 1.3 mm footprint and 1.0 mm height; compatible with standard reflow profiles and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Power supply input - must be decoupled with 10–100 nF capacitor close to pin for noise immunity and startup stability. |
| 2 | OUTPUT | Open-drain output - sinks up to 20 mA; requires external pull-up resistor (typically 1–10 kΩ) to define logic-high voltage. |
| 3 | GND | Ground reference - shared return path for supply and output current; must connect to low-impedance system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Latch operation with polarity reversal | Outputs latch low on South pole exposure and remain latched until North pole exceeds Brp - eliminates need for external flip-flop in position tracking. |
| Chopper-stabilized architecture | Reduces offset drift to <±0.5 mV over –40°C to +125°C - maintains consistent Bop/Brp across automotive and industrial temperature extremes. |
| High magnetic sensitivity | Bop = +18 Gauss typ. - enables use with low-strength magnets or increased mechanical air gaps, reducing assembly tolerance constraints. |
| RF noise immunity | Validated against common industrial EMI sources - prevents false triggering in motor drive and power converter environments. |
| Wide temperature range | –40°C to +125°C operating range - qualified for under-hood, factory automation, and outdoor equipment deployments. |
Applications
| Brushless DC Motor Commutation | RPM Measurement |
|---|---|
|
Use Scenario: Detecting rotor magnet polarity to sequence stator winding energization in 3-phase BLDC motors. IC Role / Device Role / Timing Role: Latch-based magnetic position sensor providing synchronized edge-triggered signals to motor controller gate drivers. Use Value: Enables precise 6-step commutation with <20 µs timing resolution, supporting motor speeds up to 150,000 RPM at 10-pole pairs. |
Use Scenario: Counting magnetic pulses from rotating gear or shaft-mounted magnet to compute rotational speed. IC Role / Device Role / Timing Role: Digital pulse generator with hysteresis-filtered output, directly interfacing to MCU timer capture inputs. Use Value: Delivers jitter-free pulse trains with 10–20 µs response, enabling ±0.5% RPM accuracy at 100 Hz–10 kHz input frequencies. |
| Wheel Speed Sensing | Flow Metering |
|
Use Scenario: Monitoring toothed wheel or encoder ring rotation on automotive or industrial vehicle axles. IC Role / Device Role / Timing Role: Magnetic threshold detector converting mechanical rotation into digital ON/OFF transitions per tooth passage. Use Value: Maintains reliable signal integrity at vibration levels up to 50 g and ambient temperatures up to +125°C under chassis mounting. |
Use Scenario: Sensing turbine or paddle rotation in liquid/gas flow meters using embedded permanent magnets. IC Role / Device Role / Timing Role: Low-power, latch-mode pulse counter element tolerant to intermittent power and wide supply variation. Use Value: Operates down to 2.4V with <3.2 mA supply current, supporting battery-powered meters with >5-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Allegro A1120ELHLT-T | Higher Bop (+30 G typ.), wider VDD range (3.0–24 V), but no chopper stabilization - exhibits greater temperature drift (>±3 G over –40°C to +125°C). | Preferred for high-voltage industrial drives; less suitable for precision low-voltage battery systems requiring tight threshold stability. | Select when supply exceeds 5.5V or extreme magnetic field strength is needed; avoid where thermal hysteresis consistency is critical. |
| Melexis US1881EUA-ABA-001-SP | Similar Bop (+18 G), but bipolar latching (South ON/North OFF) and integrated Schmitt trigger - fixed 3.3V/5V supply only, no 2.4V operation. | Better for consumer-grade encoders; lacks extended low-voltage capability required for energy-harvesting or Li-ion powered designs. | Choose for cost-sensitive, non-automotive applications with stable 3.3V/5V rails; not recommended for sub-3V operation or AEC-Q100 environments. |
Compared with AH1712-SA-7, A1120 offers higher voltage headroom but sacrifices thermal stability, while US1881 provides integrated signal conditioning at the cost of supply flexibility and extended temperature performance - AH1712 remains optimal for low-voltage, high-precision industrial sensing where latch reliability across temperature is paramount.
Availability
AH1712-SA-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, wheel speed sensing, and flow metering requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial OEM programs.
Supply support for AH1712-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 solutions, with design, manufacturing, and distribution operations across Asia, the Americas, and Europe.
AH1712-SA-7 belongs to the AH17xx family of Hall-effect latch switches engineered for high-reliability position and speed sensing in harsh industrial and transportation environments - emphasizing low-voltage operation, chopper stability, and AEC-Q200-ready robustness.
FAQ
What is the magnetic polarity behavior of AH1712-SA-7?
The AH1712-SA-7 is a direct-polarity latch: a South magnetic pole applied to the top of the package turns the open-drain output ON (low), and it remains latched until a sufficiently strong North pole reduces flux below the release point (Brp ≈ –18 G). This behavior is confirmed in the magnetic characteristics table on page 4 of DS45410 Rev. 3–2.
Can AH1712-SA-7 operate reliably at 2.4V supply?
Yes - AH1712-SA-7 is fully specified from 2.4V to 5.5V. At 2.4V, typical supply current is 2.0 mA, startup time is 38 µs, and output sinking capability remains 20 mA. All electrical and magnetic parameters in the datasheet are guaranteed across this full range, including operation at –40°C.
Is an external capacitor required for stable operation?
Yes - a 10 nF to 100 nF ceramic decoupling capacitor (CIN) between VDD and GND is mandatory per the Typical Applications Circuit on page 2. It stabilizes the internal bandgap regulator and improves immunity to supply noise and fast transients, especially during motor switching events.
Does AH1712-SA-7 meet automotive qualification standards?
No - AH1712-SA-7 is not AEC-Q100 qualified. While it operates from –40°C to +125°C and features 8 kV HBM ESD, Diodes explicitly states that automotive-grade variants require separate change control, PPAP capability, and IATF 16949 manufacturing - contact Diodes directly for AEC-Q200-compliant alternatives like the AH37xx series.
AH1712-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:
- 3.7mT Trip, -3.7mT 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
AH1712-SA-7 FAQ
1.How can I place an order for AH1712-SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH1712-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 AH1712-SA-7 reliable?
The price and inventory of AH1712-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 AH1712-SA-7 is usually 5 days.
3.What payment methods are accepted for AH1712-SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH1712-SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH1712-SA-7?
AH1712-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH1712-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 AH1712-SA-7?
For technical support, including AH1712-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH1712-SA-7 requirements.
6.How does Aetrix verify that AH1712-SA-7 is sourced from the original manufacturer or authorized distributors?
All AH1712-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 AH1712-SA-7 meets industry standards.
7.What is the process for return or replacement of AH1712-SA-7?
All AH1712-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH1712-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 AH1712-SA-7 part is unused and in its original packaging.
Return procedure for AH1712-SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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