Some simulators, e.g. PSpice, cannot operate the “area“ statement used in some models. If the value of “area” is 1, the statement can be deleted without affecting the simulation result. If the value of “area” is unequal to 1, the model can be modified as described in the following example:

SPICE:
Q2 11 222 33 BCV46
AREA = 4.68

PSPICE:
Q2 11 222 33 BCV46 4.68

If this modification is not successful, NXP can provide a simple, but less accurate model on request. The loss of accuracy will refer mainly to the area of quasi saturation. To receive a simplified model, please contact the NXP customer support.

Error messages

Below some typical error messages with corresponding description:

Error Message: Unknown subcircuit

This mistake can occur if one of the folders nxp_sym and nxp_sub has not been updated. Please check if you have copied each of the folders .nxp_sym and nxp_sub to your LT-Spice folder.

Message: Missing model

Please check if the spelling of the model component name (marked red and green) in the netlist is exactly the same as in the “.model” statement below.

Message: Undefined subcircuit

Please check:

• if there is a dot missing before the “subcircuit” statement

correct: .SUBCKT PBSS303NX
false: SUBCKT PBSS303NX

• the netlist itself: Transistors have to start with Q, diodes with D

correct: Q1 1 2 3 transistor_name NPN
   D1 1 2 diode_name D

false: DQ1 1 2 3 transistor_name NPN
   *D1 1 2 diode_name D

Message: No analysis request found

Please check the syntax of the SPICE model. The last line of the model has to be the ".ENDS" statement, starting with a dot:

* this
* is
* an
* example
.ENDS

Message: Too few nodes:

Please check the syntax of the SPICE model. Comment lines have to start with an asterisk symbol. In the following example the error message will be “too few nodes: is an”, because the line “is an” without asterisk will be interpreted as device with zero nodes..

* this
is an
* example

If there are difficulties in applying NXP spice models, please do not hesitate to contact the customer support. We appreciate your feedback as it help us eliminate errors and improve applicability.