copyright Vishay Intertechnology, Inc 2026


QSPICE_models_PPPTC_smoke_v01.txt  
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author : Alain Stas
date: 15/02/2026

This directory contains the QSPICE encrypted netlists and the symbols associated with the following Vishay Polymer PTC SMD components                         

PPTC0603E3002V60  (data sheet 29254)https://www.vishay.com/en/product/29254/		 
PPTC0603E3003V36  		 
PPTC0603E3010V15 
		
PPTC0805E3010V15  (data sheet 29255)https://www.vishay.com/en/product/29255/		
PPTC0805E3050V06 
	
PPTC1206E3010V60  (data sheet 29256)https://www.vishay.com/en/product/29256/		
PPTC1206E3020V24 		
PPTC1206E3020V30 	
PPTC1206E3035V16 	
PPTC1206E3035V30 
	
PPTC1210E3010V90  (data sheet 29257)https://www.vishay.com/en/product/29257/		
PPTC1210E3050V13 		
PPTC1210E3075V24 

PPTC1812E3014V60  (data sheet 29258)https://www.vishay.com/en/product/29258/
PPTC1812E3050V30
PPTC1812E3150V24
PPTC1812E3150V12

PPTC2920E3050V60  (data sheet 29259)https://www.vishay.com/en/product/29259/
PPTC2920E3075V60
PPTC2920E3110V60
PPTC2920E3250V15

The models will work exclusively in QSPICE (from QORVO) which can be downloaded at https://www.qorvo.com/design-hub/design-tools/interactive/qspice

Each P/N has 3 associated instances for R25: nominal, minimum and maximum, for example PPTC1210E3075V24-NOM, PPTC1210E3075V24-MIN and PPTC1210E3075V24-MAX.
The characteristics modelled here represent the behaviour of the parts after soldering.
After tripping, the model will present a permament resistance drift (aging)

The trip times resulting from simulation fit reasonably well the measurements (nominal values given in the data sheet).
Submitted to the specified trip current at ambient 25°C, all the 3 instances (MIN, NOM and MAX) will trip after different times: the longest time will be applicable to the MIN instance, the shortest time being associate to the MAX instance.

All the models must be tested with a maximal voltage not exceeding + 20/+ 30% of the rated voltage ( for example 60V for PPTC2920E3050V60, that will give 72 V).Around these levels and above , the component resistance will begin to decrease and ultimately the model will be permanently transformed in a short circuit (1 mohm). This is why this library is called "SMOKE", as this potential short circuit is likely to introduce a serious failure mode in the real world.  

Ambient temperature effects are taken into account: the spice directive in order to change the ambient temperature to -40°C for example is ".option TEMP=-40"
The TEMP parameter can also be swept using the directive ".STEP TEMP list -40 25 40"(3 simulations)  or ".step TEMP -40 40 10" (from -40°C up to 40°C by step of 10°C)

The directory contains simulations (trial_with_smokex) which associated spice directives in order to verify the hold and trip current and time, the failure by short circuiting due to the exceeding of the rated voltage, and the derating in temperature.

CAUTIONS and WARNINGS
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The models and simulations are provided solely on an "AS IS" and "AS AVAILABLE" basis for the convenience of Vishay customers, and without any warranties or representations of any kind, express or implied, all of which are hereby expressly disclaimed.
Every result from the simulation should be ultimately verified on a real board, in order to validate it.  
Any information, computations, or results generated by the programs, or otherwise available from or through the programs, is provided and utilized at your own discretion and risk. Vishay does not assume any responsibility or liability resulting from your use of the programs or any such information, computations, or results, and shall have none. The foregoing is in addition to, and not in limitations of, the exclusions and limitations of liability, and notices and disclaimers, set forth at Vishay Privacy & Legal.

  

