LTSpice data parsing library for python

Thanks to DongHoonPark

changes in this fork:

• double precision data parsing added: LTspice has an option to export data in 64-bit (double-precision)

Installation

first install the standard package from DongHoonPark

$ pip install ltspice

than go to the folder where the packages for python are saved:
in Windows:
"python_location"\Lib\site-packages\ltspice
and exchange the ltspice.py with the ltspice.py from this repo

or just copy the ltspice.py from this repo into your project

Usage

import ltspice
filepath = 'Your ltspice output file (.raw)'
l = ltspice.Ltspice(filepath)
l.parse() # Data loading sequence. It may take few minutes.

time = l.getTime()
V1 = l.getData('V(N1)')

Examples

01 - RC Circuit

LTSpice file (.asc)

Python code (.py)

import ltspice
import matplotlib.pyplot as plt
import numpy as np
import os

l = ltspice.Ltspice(os.path.dirname(__file__)+'\\rc.raw') 
# Make sure that the .raw file is located in the correct path
l.parse() 

time = l.getTime()
V_source = l.getData('V(source)')
V_cap = l.getData('V(cap)')

plt.plot(time, V_source)
plt.plot(time, V_cap)
plt.show()

Output result

02 - Multi point simulation

LTSpice file (.asc)

Python code (.py)

import ltspice
import matplotlib.pyplot as plt
import numpy as np
import os

l = ltspice.Ltspice(os.path.dirname(__file__)+'\\rectifier.raw') 
# Make sure that the .raw file is located in the correct path
l.parse() 

time = l.getTime()
V_source = l.getData('V(source)')
V_cap_max = []

plt.plot(time, V_source)
for i in range(l._case_num): # Iteration in simulation cases 
    time = l.getTime(i)
    # Case number starts from zero
    # Each case has different time point numbers
    V_cap = l.getData('V(cap,pgnd)',i)
    V_cap_max.append(max(V_cap))
    plt.plot(time, V_cap)

print(V_cap_max)

plt.xlim((0, 1e-3))
plt.ylim((-15, 15))
plt.grid()
plt.show()

Output result

$ [8.299080580472946, 7.855469107627869, 7.391375303268433, 6.944645524024963, 6.529755532741547]

If you want to find more usage examples, please check examples folder.