part number	NF, dB @ 1 GHz	Gp, dB @ 0.1 GHz	package	outline	data sheet
MSA-3111	3.5 typ	24.4 typ 23.5 min	SOT-143		pdf
MSA-3135	3.2 typ	24.5 typ 23.5 min	micro-x		pdf
MSA-3185	3.5 typ	24.4 typ 23.5 min	85 mil plastic		pdf
MSA-3186	3.5 typ	24.6 typ 23.5 min	SMT 85 mil plastic		pdf

packages: 11 35 85 86

* MSA-31 MODEL
* Combine with package model to complete

* DIE MODEL
XA31 DIEOUT  DIEIN   DIEGND  MSA31
.ENDS

* chip model
.SUBCKT MSA31   DIEOUT  DIEIN   DIEGND
RF      DIEIN   DIEOUT  1115    (TC1=-0.8E-3)
RE      Q2E     DIEGND  0
RB      DIEIN   DIEGND  570     (TC1=-0.8E-3)
RBIAS   Q1E     DIEGND  75      (TC1=-0.8E-3)
CF      DIEIN   DIEOUT  0.06PF
CP1     Q1E     DIEOUT  0.05PF
CP2     Q2E     DIEOUT  0.25PF
XA31Q1  DIEOUT  DIEIN   Q1E     A31Q1
XA31Q2  DIEOUT  Q1E     Q2E     A31Q2
.ENDS

* Q1 distributed base model
.SUBCKT A31Q1   Q1C     Q1B     Q1E
RB1     Q1B     11     2.42    (TC1=0.8E-3)
RB2     11      12     7.45    (TC1=1.2E-3)
RB3     12      B1     6.25    (TC1=1.8E-3)
RE      E1      Q1E    0.55    (TC1=0.6E-3)
RC      C1      Q1C    5       (TC1=0.6E-3)
Q1      C1      B1     E1      QMSA    180
DCD1    Q1B     C1     DMOD    292
DCD2    11      C1     DMOD    292
DCD3    12      C1     DMOD    146
.ENDS

* Q2 distributed base model
.SUBCKT A31Q2   Q2C     Q2B     Q2E
RB1     Q2B     21     1.48    (TC1=0.8E-3)
RB2     21      22     4.47    (TC1=1.2E-3)
RB3     22      B2     3.75    (TC1=1.8E-3)
RE      E2      Q2E    0.33    (TC1=0.6E-3)
RC      C2      Q2C    5       (TC1=0.6E-3)
Q1      C2      B2     E2      QMSA    300
DCD1    Q2B     C2     DMOD    432
DCD2    21      C2     DMOD    486
DCD3    22      C2     DMOD    243
.ENDS

.MODEL  DMOD    D(IS=1E-25, CJO=2.45E-16, VJ=.76,
+               M=.53, BV=45, IBV=1E-9)
.MODEL  QMSA    NPN (BF=90, BR=5, IS=1.65E-18, VA=20,
+               TF=12PS, CJE=1.8E-15, VJE=1.01, MJE=0.6,
+               PTF=25, XTB=1.818, VTF=6, ITF=3E-4,
+               IKF=1.333E-4, XTF=4, NF=1.03, ISE=5E-15,
+               NE=2.5)

MSA-3100		package 00 model
MSA-3111		package 11 model
MSA-3135		package 35 model
MSA-3136		package 36 model
MSA-3170		package 70 model
MSA-3185		package 85 model
MSA-3186		package 86 model

file name	description
a3111i29.s2p	MSA-3111 s parameters at 29 mA	view
a3135i29.s2p	MSA-3135 s parameters at 29 mA	view
a3185i29.s2p	MSA-3185 s parameters at 29 mA	view
a3186i29.s2p	MSA-3186 s parameters at 29 mA	view

General Information about Amplifier ICs
Information about MSA Series IC Amplifiers
Assembly Information