Allegro A1101EUA-T Hall Effect Switch SIP-3

The Allegro A1101EUA-T is a next-generation unipolar Hall-effect switch, designed as a drop-in replacement for the popular Allegro 312x and 314x lines. Manufactured using advanced BiCMOS technology, this switch delivers fast power-on time and low-noise operation, ensuring reliable performance in a wide range of applications.

The device integrates a voltage regulator, Hall voltage generator, small-signal amplifier, Schmitt trigger, and an NMOS output transistor on a single silicon chip. Factory programming after packaging eliminates offsets caused by package stress, while unique Hall element geometries and low-offset amplifiers minimize noise and residual offset voltage. This results in increased switch point accuracy and stable operation across the full temperature range.

Key Features:

• Unipolar south pole sensing with typical operate point of 100G and release point of 45G (at 25°C)
• Wide supply voltage range from 3.8V to 24V
• AEC-Q100 qualified for automotive applications
• Reverse battery protection and solid-state reliability
• Robust EMC performance and high ESD rating
• Regulator stability without a bypass capacitor
• Continuous-time operation for fast power-on and low noise
• 3-pin SIP package with operating temperature range from -40°C to 85°C

This Hall-effect switch is ideal for position sensing, speed detection, and proximity applications in demanding environments. Its factory-programmed performance and high reliability make it a trusted choice for engineers seeking precision and durability.

Specifications:

• Sensing Type: Unipolar – South Pole
• Operate Point Typ: 175G (per datasheet) / 100G (description)
• Release Point Typ: 10G (per datasheet) / 45G (description)
• Supply Voltage: 3.8V to 24V
• Output Type: Voltage
• Package: SIP-3
• Operating Temperature: -40°C ~