The A1220, A1221, A1222, and A1223 Hall-effect sensor ICs are extremely temperature-stable and stress-resistant devices especially suited for operation over extended temperature ranges to 150°C. Part A1221 is a semiconductor component manufactured by NEC. According to the specifications provided in Ic-phoenix technical data files, it is a high-speed switching diode with the following key characteristics:

- **Type**: High-speed switching diode
- **Maximum Reverse Voltage (V_R)**: 75V
- **Average Rectified Forward Current (I_F(AV))**: 150mA
- **Peak Forward Surge Current (I_FSM)**: 1A
- **Forward Voltage (V_F)**: 1V at 10mA
- **Reverse Recovery Time (t_rr)**: 4ns
- **Operating Temperature Range**: -55°C to +150°C
- **Package**: SOD-123 (Surface Mount Device)

These specifications are typical for high-speed switching applications, and the part is designed for use in circuits requiring fast switching and low power loss.