Spice Model for Metelics Step Recovery Diodes 1 of 2 Spice does not include the Transition Time in the diode model. The parameter TT in spice is the minority carrier life time. Model for MMD805 .MODEL D_805 (IS=500.0E-15 N=1.3 RS=0.13 CJ0=4.55E-12 VJ=0.5 M=0.235 XTI=3.0 EG=1.12 BV=60 IBV=10E-6 TT=30E-9) Part Number Rs CJ0 pF Minimum Vbr V TT nS MMD-805, SMMD805 0.13 4.55 to 6.37 60 30 MMD-810, SMMD810 0.13 2.73 to 4.55 50 30 MMD-820, SMMD820 0.13 1.82 to 3.09 40 30 MMD-830, SMMD830 0.13 0.91 to 1.82 25 20 MMD-832, SMMD832 0.15 0.73 to 1.46 20 12 MMD-835, SMMD835 0.19 0.55 to 1.27 15 10 MMD-837, SMMD837 0.22 0.36 to 0.73 20 10 MMD-840, SMMD840 0.22 0.36 to 0.73 15 10 Part Number Rs CJ0 pF Minimum Vbr V TT nS MMDB-30 1 0.46 14 1 to 5 MMDB-35 1 0.36 16 1 to 5 MMDB-45 1 0.36 25 1 to 5 Is=100fA to 1pA N=1.2 to 1.4 VJ=0.5 M=0.235 EG=1.12 XTI=3 CJ0=1.82*Cj6 Metelics provides Spice models that may be used and distributed freely, provided they are not changed in any way, resold or included in any other package for resale. These models are furnished on an "as is" basis without warranty of any kind. Metelics reserves the right to make changes to any model without notice. Although the use of models can be a useful tool in evaluating devices for applications, they do not exactly model all device characteristics under all conditions. 2 of 2 Part Number Rs CJ0 pF Minimum Vbr V TT nS MMD0151 0.13 1.04 to 1.25 15 10 MMD0153 0.13 0.60 to 0.77 25 10 MMD0803 0.13 8.5 to 10.92 70 200 MMD0815 0.13 6.0 to 7.28 50 100 MMD0825 0.13 2.2 to 3.64 45 30 MMD0833 0.13 2.0 to 3.0 25 10 MMD0840 0.13 0.9 to 1.09 15 10