Spice Models for Metelics Schottky Diodes

The standard diode model found in Spice (Ver 2) does not correctly model the reverse bias characteristics of Metelics Schottky diodes. To correct this problem, use the macromodel shown below.

Diode DF models the forward bias curve, capacitance and transit time. Diode DR models the reverse bias curve. Diode DI isolates diode DR from the circuit when the macromodel is forward biased. The parameters for DF and DR for the catalog part numbers are shown on the pages that follow. The parameters for diode DI are shown below. Package parasitics are not include in the macromodel.  See the outline datasheets for the package parasitics. Spice parameters not  included are KF, AF and FC.

Macromodel for MSS30,046

.SUBCKT LB_SCH 1 2              1 is Anode     2 is Cathode
D1 1 2 DF
D2 3 1 DI
D3 2 3 DR
.MODEL DF D (IS=26.05E-9 N=1.0 RS=10.0 CJO=0.10E-12 VJ=0.7 M=0.2 XTI=2.0 EG=0.5 TT=3.0E-12)
.MODEL DR D (IS=37.4E-9 N=20.71 XTI=4.0 EG=33.5)
.MODEL DI D (N=0.05 RS=0.001 CJO=0.001E-12 XTI=0.0 EG=0.0)
.ENDS

Example circuit using macromodel

.DC V1 .2 .6 .1
.PRINT DC V(2)
V1 1 0 0
R1 1 2 1000
X1 2 0 LB_SCH
.SUBCKT LB_SCH 1 2
D1 1 2 DF
D2 3 1 DI
D3 2 3 DR
.MODEL DF D (IS=26.05E-9 N=1.0 RS=10.0CJO=0.10E-12 VJ=0.7 M=0.2 XTI=2.0 EG=0.5 TT=3.0E-12)
.MODEL DR D (IS=37.4E-9 N=20.71 XTI=4.0 EG=33.5)
.MODEL DI D (N=0.05 RS=0.001 CJO=0.001E-12 XTI=0.0 EG=0.0)
.ENDS
.END

Listed below are the parameters that need to be changed to get the model to match a particular part number. Note: N, VJ, M, TT and XTI do not change from what was shown above.

MSS30,000 Series Diodes

Parameters for diode DF 

Part Number

IS

RS

CJ0

EG

MSS30,046
MSS30,142
MSS30,242
MSS30,346
MSS30,442
MSS30,B46
MSS30,CR46
MSS30,PCR46

9.1nA to 43nA

8 to 12

0.08 to 0.12pF

0.5

MSS30,050
MSS30,148
MSS30,248
MSS30,448

16.5nA to 80nA

4.8 to 7.2

0.17 to 0.27pF

0.5

MSS30,154
MSS30,254
MSS30,454
MSS30,B53
MSS30,CR53
MSS30,PCR53

43nA to 154nA

2.4 to 3.6

0.17 to 0.27pF

0.5

Parameters for diode DR
  IS=37.4nA
  N=20.71
  XTI=4.0
  EG=33.5

MSS39,000 Series Diodes

Parameters for diode DF

Part Number

IS

RS

CJ0

EG

MSS39,045

29nA to 59pA

35 to 85

0.07 to 0.10pF

0.65

MSS39,048

40nA to 65pA

35 to 85

0.10 to 0.15pF

0.65

MSS39,148

40nA to 65pA

35 to 85

0.07 to 0.12pF

0.65

MSS39,152

55nA to 103pA

35 to 85

0.12 to 0.18pF

0.65

Parameters for diode DR

Part Number

IS

N

XTI

EG

MSS39,045
MSS39,048

34.8nA

33.96

4.0

11.0

MSS39,148
MSS39,152

35.9nA

23.93

4.0

11.0

MSS40,000 Series Diodes

Parameters for diode DF

Part Number

IS

RS

CJ0

EG

MSS40,045
MSS40,341

3nA to 4.5pA

5.6 to 8.4

0.07 to 0.11pF

0.6

MSS40,048
MSS40,148
MSS40,248
MSS40,448

5.5nA to 11pA

5.6 to 8.4

0.09 to 0.14pF

0.6

MSS40,141
MSS40,244

3.5nA to 4.9pA

8 to 12

0.05 to 0.07pF

0.6

MSS40,155
MSS40,255
MSS40,455

9.5nA to 26.5pA

4 to 6

0.2 to 0.3pF

0.6

MSS40,B46
MSS40,CR46
MSS40,PCR46

1nA to 0.7pA

8 to 20

0.07 to 0.125pF

0.6

MSS40,B53
MSS40,CR53
MSS40,PCR53

2.5nA to 3.2pA

5 to 10

0.1 to 0.25pF

0.6

Parameters for diode DR
  IS=37.4nA
  N=20.71
  XTI=4.0
  EG=11.0

MSS50,000 Series Diodes

Parameters for diode DF

Part Number

IS

RS

CJ0

EG

MSS50,048

250pA to 110fA

5.6 to 8.4

0.09 to 0.14pF

0.76

MSS50,062

205pA to 90fA

1.6 to 2.4

0.4 to 0.6pF

0.76

MSS50,146

146pA to 47fA

7.2 to 10.8

0.05 to 0.09pF

0.76

MSS50,244
MSS50,341
MSS50,448

146pA to 47fA

5.8 to 7.2

0.16 to 0.24pF

0.76

MSS50,B46
MSS50,CR46
MSS50,PCR46

130pA to 115fA

8 to 15

0.07 to 0.125pF

0.76

MSS50,B53
MSS50,CR53
MSS50,PCR53

250pA to 110fA

5 to 10

0.1 to 0.25pF

0.76

Parameters for diode DR

Part Number

IS

N

XTI

EG

MSS50,048

35.9nA

23.93

4.0

11.0

MSS50,062
MSS50,146
MSS50,244
MSS50,341
MSS50,448

34.8nA

33.96

4.0

11.0

MSS50,B46
MSS50,CR46
MSS50,PCR46
MSS50,B53
MSS50,CR53
MSS50,PCR53

37.4nA

20.71

4.0

11.0

MSS60,000 Series Diodes

Parameters for diode DF

Part Number

IS

RS

CJ0

EG

MSS60,144
MSS60,244
MSS60,341
MSS60,444

319fA to 8.3fA

10 to 20

0.06 to 0.1pF

0.88

MSS60,148
MSS60,248
MSS60,448

256fA to 6.8fA

7 to 13

0.09 to 0.15pF

0.88

MSS60,153
MSS60,253
MSS60,453

220fA to 5.6fA

3 to 7

0.15 to 0.25pF

0.88

MSS60,B46

2.2pA to 0.07fA

10 to 20

0.06 to 0.125pF

0.88

MSS60,B53

5pA to 0.3fA

7 to 13

0.1 to 0.25pF

0.88

MSS60,CR46
MSS60,PCR46

9pA to 0.6fA

10 to 20

0.06 to 0.125pF

0.88

MSS60,CR53
MSS60,PCR53

13pA to 1.2fA

7 to 13

0.1 to 0.25pF

0.88

Parameters for diode DR
  IS=35.9nA
  N=23.93
  XTI=4.0
  EG=11.0

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© 2003 Aeroflex / Metelics
Last Revised 4/22/03