High-Sensitivity Hall Effect Latch from Diodes Incorporated Enhances Position Sensing in Automotive Motor Control Systems

Key Terms

hall effect latches technical

Hall effect latches are electronic switches that detect the presence and polarity of a magnetic field and then 'latch' into an on or off state until an opposite magnetic field resets them. Think of them as a light switch that stays set until a second magnet flips it. They matter to investors because they often replace mechanical switches in cars, motors and consumer devices, improving durability and lowering maintenance; changes in demand, supply or design wins can directly affect component makers' revenues and margins.

brushless dc (bldc) motor technical

A brushless DC (BLDC) motor is an electric motor that uses electronic controllers instead of physical brushes to route current, resulting in smoother rotation, higher efficiency, less wear and quieter operation than older brushed designs. Investors pay attention because BLDC motors lower energy and maintenance costs, improve product performance in applications from consumer electronics to electric vehicles and industrial machines, and can influence a company’s manufacturing costs, competitive edge and revenue prospects.

esd technical

Endoscopic submucosal dissection (ESD) is a minimally invasive medical procedure that uses a thin, flexible tube with tools and a camera to cut out abnormal tissue from the inner lining of the digestive tract in one piece, like removing a stain cleanly from fabric rather than cutting out a whole patch. For investors, outcomes, adoption rates, device approvals and reimbursement for ESD affect market demand for surgical tools, training services and related medical technology, influencing revenue potential and regulatory risk.

open-drain outputs technical

Open-drain outputs are a type of electronic pin on a chip that can actively connect a signal line to ground (pull it low) but cannot drive it high by themselves; an external resistor or another device is needed to pull the line up. For investors, this matters because open-drain designs affect how chips are integrated into systems, influencing compatibility, power use, board complexity and component counts—factors that can change manufacturing cost, product performance and market adoption.

sot23 technical

A SOT‑23 is a common tiny plastic housing used to hold discrete electronic parts such as transistors, diodes or small integrated circuits; think of it as a miniature protective shell that lets components be soldered onto circuit boards. Investors care because the use of SOT‑23 signals mass‑manufacturable, space‑efficient parts that affect product size, cost, supply chain volume and manufacturing yields — factors that influence margins, production capacity and time to market.

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PLANO, Texas--(BUSINESS WIRE)-- Diodes Incorporated (Diodes) (Nasdaq: DIOD) expands its AH371xQ series of automotive-compliant* Hall effect latches for motor control applications that need to operate at very low magnetic thresholds and bipolar switching behaviors. Featuring a proprietary Hall plate design, the AH3711Q is used for brushless DC (BLDC) motor control, valve operation, linear and incremental rotary encoders, and position-sensing functions. Vehicle applications include window power-lift and sunroof movement, tailgate opening/closing mechanisms, seat adjustment motors, cooling fans, water/oil pumps, and speed measurement.

The magnetic operate (B_OP) and release (B_RP) points over the AH3711Q, which covers ±10 Gauss, delivers greater placement flexibility. This ultra-high sensitivity enables it to detect weaker magnetic fields, allowing the use of smaller, more cost-effective magnets to reduce system size and the total bill-of-materials (BOM) cost. The greater magnetic margin also enables aggressive duty-cycle reduction, lowering power consumption and extending battery life.

To enhance system reliability, the Hall effect latch operates over a 3V to 27V range. The device has a reverse blocking diode with a Zener clamp on the supply, and the output has an overcurrent limit and a Zener clamp. This combination of components provides protection against 40V load dumps, reverse polarity, and short circuits. The wide input voltage range, coupled with a high 8kV HBM and 1kV CDM ESD rating, further enhances the device’s robustness in harsh environments.

The device also features a chopper-stabilized design, which minimizes switch-point drift across the full -40°C to +150°C temperature range and provides high resistance to physical stress during PCB assembly. This mitigates the effects of thermal variation and enhances stray-field immunity. The power-on time is typically 13µs, which helps avoid system-level faults. Open-drain outputs offer greater external pull-up flexibility for voltages above or below the supply voltage.

The magnetic operating and release polarity is opposite for the SOT23 (Type S) and SC59 packages. For operation, the SOT23 (Type S) and SIP-3 (Bulk Pack) packages require the south pole to the part-marking side, and the SC59 requires the south pole to the non-part-marking side.

The AH3711Q is available at $0.20 in 2,000-piece quantities. A standard-compliance version, AH3711, is also available for industrial and commercial applications.

About Diodes Incorporated

Diodes Incorporated (Nasdaq: DIOD), delivers high-quality semiconductor products to the world’s leading companies in the automotive, industrial, computing, consumer electronics, and communications markets. We leverage our expanded product portfolio of analog and power solutions combined with a flexible hybrid manufacturing model that meet customers’ needs. Our broad range of application-specific products, delivered through a total solutions sales approach and supported by global operations including engineering, testing, manufacturing, and customer service, enable us to be a premier provider for high-growth markets. For more information, visit www.diodes.com.

*Automotive-compliant - AEC qualified, manufactured in facilities certified to IATF 16949, supporting PPAP documents.

The Diodes logo is a registered trademark of Diodes Incorporated in the United States and other countries.

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Company Contact:
Gurmeet Dhaliwal
Vice President, Corporate Marketing & Investor Relations
Diodes Incorporated
+1 408-232-9003
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Source: Diodes Incorporated (P)