© 2001 Fairchild Semiconductor Corporation P4SMA18A Rev. A
P4SMA18A
400 Watt Unidirectional Transient Voltage Suppressor
Absolute Maximum Ratings (Note 1) TA = 25°C unless otherwise noted
Symbol Parameter Value Units
PPPM Peak Pulse Power Dissipation on 10/1000µs waveform 400 W
IPPM Peak Pulse Current on 10/1000µs waveform 15.9 A
IFSM Non-repetitive Peak Forward Surge Current superimposed on
rated load (JEDEC method) (Note 2) 40 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 TA = 25°C unless otherwise noted
Symbol Parameter Value Units
RΘJA Thermal Resistance from Junction to Ambient 120 °C/W
RΘJL Thermal Resistance from Junction to Leads 30 °C/W
Tstg Storage Temperature Range –65 to +150 °C
TJOperating Junction Temperature –65 to +150 °C
Electrical Characteristics TA = 25°C unless otherwise noted
Symbol Parameter Value Units
VBR Breakdown Voltage at IT = 1.0mA 17.1 - 18.9 V
αTMaximum Temperature Coefficient of VBR 0.089 %/°C
VRWM Reverse Stand-off Voltage 15.3 V
IRMaximum Reverse Leakage Current @ VRWM 1µA
VCMaximum Clamping Voltage @ IPPM 25.2 V
P4SMA18A
DO-214AC (SMA)
Color Band Denotes Cathode
Device Marking: 18A
