P4SMA18A P4SMA18A DO-214AC (SMA) Color Band Denotes Cathode Device Marking: 18A 400 Watt Unidirectional Transient Voltage Suppressor Absolute Maximum Ratings (Note 1) T Symbol PPPM IPPM IFSM A = 25C unless otherwise noted Parameter Value Units Peak Pulse Power Dissipation on 10/1000s waveform Peak Pulse Current on 10/1000s waveform Non-repetitive Peak Forward Surge Current superimposed on rated load (JEDEC method) (Note 2) 400 15.9 40 W A A Note 1: These ratings are limiting values above which serviceability of any semiconductor device may be impaired. Note 2: Measured on 8.3ms single half-sine wave or equivalent square wave. Duty cycle = 4 pulses per minute maximum. Thermal Characteristics T Symbol RJA RJL Tstg TJ A = 25C unless otherwise noted Parameter Thermal Resistance from Junction to Ambient Thermal Resistance from Junction to Leads Storage Temperature Range Operating Junction Temperature Electrical Characteristics T Symbol VBR T VRWM IR VC A Units 120 30 -65 to +150 -65 to +150 C/W C/W C C Value Units 17.1 - 18.9 0.089 15.3 1 25.2 V %/C V A V = 25C unless otherwise noted Parameter Breakdown Voltage at IT = 1.0mA Maximum Temperature Coefficient of VBR Reverse Stand-off Voltage Maximum Reverse Leakage Current @ VRWM Maximum Clamping Voltage @ IPPM (c) 2001 Fairchild Semiconductor Corporation Value P4SMA18A Rev. A