BC557 Spice accuracy

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I got this model from Onsemi and would like to tweak it to get more realistic gain of around 300, which only shelves off at about 100mA.
This model gives very high gain at low currents, but low gain even at 10mA, although IKF is high

* Model generated on May 13, 05
* MODEL FORMAT: PSpice
.MODEL Qbc557b pnp
+IS=1.68077e-12 BF=3385 NF=1.2121 VAF=196.745
+IKF=1.30809 ISE=1.76095e-13 NE=1.56412 BR=99.5231
+NR=1.23271 VAR=0.978236 IKR=10 ISC=1.76095e-13
+NC=1.21727 RB=17.2944 IRB=0.1 RBM=0.1
+RE=0.354597 RC=1.77298 XTB=0.100946 XTI=1
+EG=1.05 CJE=1.13417e-11 VJE=0.654776 MJE=0.23
+TF=5.99604e-10 XTF=1000 VTF=3935.03 ITF=31.8969
+CJC=9.54039e-12 VJC=0.4 MJC=0.408114 XCJC=0.910091
+FC=0.8 CJS=0 VJS=0.75 MJS=0.5
+TR=1e-07 PTF=0 KF=0 AF=1
 

Elvee

Member
2006-09-08 2:04 pm
I got this model from Onsemi and would like to tweak it to get more realistic gain of around 300, which only shelves off at about 100mA.
This model gives very high gain at low currents, but low gain even at 10mA, although IKF is high

* Model generated on May 13, 05
* MODEL FORMAT: PSpice
.MODEL Qbc557b pnp
+IS=1.68077e-12 BF=3385 NF=1.2121 VAF=196.745
+IKF=1.30809 ISE=1.76095e-13 NE=1.56412 BR=99.5231
+NR=1.23271 VAR=0.978236 IKR=10 ISC=1.76095e-13
+NC=1.21727 RB=17.2944 IRB=0.1 RBM=0.1
+RE=0.354597 RC=1.77298 XTB=0.100946 XTI=1
+EG=1.05 CJE=1.13417e-11 VJE=0.654776 MJE=0.23
+TF=5.99604e-10 XTF=1000 VTF=3935.03 ITF=31.8969
+CJC=9.54039e-12 VJC=0.4 MJC=0.408114 XCJC=0.910091
+FC=0.8 CJS=0 VJS=0.75 MJS=0.5
+TR=1e-07 PTF=0 KF=0 AF=1

It looks like BR and BF have a wrongly placed decimal point, that's impossible
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.