The QMV155B is a Hall-effect latch from Allegro MicroSystems, designed for speed sensing, revolution counting, and proximity detection. It is a robust and reliable solution for applications requiring precise and consistent switching performance over a wide operating temperature and voltage range.

Applications

• Brushless DC (BLDC) motor commutation
• Speed sensing in automotive systems (e.g., Anti-lock Braking Systems (ABS), transmission speed sensors)
• Industrial equipment: position and speed detection
• Magnetic encoding
• Proximity detection

Features

• Single-chip Hall-effect latch
• Superior temperature stability
• Operation from 3.8 V to 24 V
• Reverse battery protection
• Solid-state reliability
• Small size
• High sensitivity

Benefits

• Precise Switching: Provides reliable and consistent switching points for accurate speed and position sensing.
• Robust Performance: Operates reliably across a broad temperature and voltage range, ensuring consistent performance in harsh environments.
• Simplified Design: Integrated features reduce the need for external components, simplifying circuit design and reducing overall system cost.
• Enhanced Reliability: Solid-state design eliminates mechanical wear, providing long-term reliability and reducing maintenance requirements.
• Compact Size: Small package size enables integration into space-constrained applications.

Additional Details

The QMV155B Hall-effect latch incorporates advanced temperature compensation circuitry to minimize the effects of temperature variations on switch points. It features a built-in regulator for stable operation over a wide voltage range. The open-collector output is easily interfaced with a variety of electronic circuits.

Technical Specifications:

• Supply Voltage: 3.8 V to 24 V
• Operating Temperature Range: -40°C to +150°C
• Output Type: Open Collector
• Package: SIP (Single Inline Package)
• Magnetic Sensitivity: Typically operates at 50 Gauss

When selecting a Hall-effect latch, factors such as magnetic sensitivity, operating temperature range, and supply voltage should be considered to ensure optimal performance in the target application. The QMV155B is a versatile solution that meets the needs of a wide range of automotive and industrial applications.