Allegro MicroSystems A1225/A1227/A1229 Hall-Effect Sensor ICs

Allegro MicroSystems A1225/A1227/A1229 Hall-Effect Sensor ICs are temperature-stable devices designed for operation over extended temperature ranges up to 150°C. These sensor ICs feature superior high-temperature performance assisted by a novel Schmitt-trigger circuit that maintains operate and release point symmetry. The Schmitt trigger achieves this by compensating for temperature changes in the Hall element. The Hall-effect sensor ICs feature reverse battery protection and an open-drain 25mA output. These sensor ICs come with an onboard regulator that allows operation with supply voltages of 3.8V to 24V. The Hall-effect sensor ICs operate within the –40°C to 150°C ambient temperature range and are compact and resistant to physical stress.

Features

Symmetrical switchpoints
Superior temperature stability
Operation from unregulated supply
Open-drain 25mA output
Reverse battery protection
Activate with small, commercially available permanent magnets
Solid-state reliability

Small size
Resistant to physical stress
Enhanced ESD structures result in 8kV HBM ESD performance without external protection components
Internal protection circuits enable 40V load dump compliance without external protection components

Specifications

Absolute maximum ratings:
- 30V forward supply voltage (V_CC)
- -30V reverse supply voltage (V_RCC)
- 30V output off voltage (V_OUT)
- 25mA continuous output current (I_OUT)
- -65°C to 170°C storage temperature range (T_stg)
- 165°C maximum junction temperature (T_J(max))
- -40°C to 150°C (Range L) operating ambient temperature range (T_A)