  We present extended point spread function (PSF) models for the Hyper
Suprime-Cam Subaru Strategic Program Public Data Release 3 (HSC-SSP PDR3) in
all $\textit{g,r,i,Z}$ and $\textit{Y}$-bands. Due to its 8.2m primary mirror
and long exposure periods, HSC combines deep images with wide-field coverage.
Both properties make HSC one of the most suitable observing facilities for low
surface brightness (LSB) studies, which are particularly sensitive to the PSF.
By applying a median stacking technique of point-like sources with different
brightness, we show how to construct the HSC-SSP PDR3 PSF models to an extent
of R $\sim$ 5.6 arcmin. These models are appropriate for the HSC-PDR3
intermediate-state data which do not have applied the final aggressive
background subtraction. The intermediate-state data is especially stored for
users interested in large extended objects, where our new PSFs provide them
with a crucial tool to characterise LSB properties at large angles. We
demonstrate that our HSC PSFs behave reasonably in two scenarios. In the first
one, we generate 2-D models of a bright star, showing no evidence of residual
structures across the five bands. In the second scenario, we recreate the
PSF-scattered light on mock images with special consideration of the effect of
this additional flux on LSB measurements. We find that, despite the
well-behaved nature of the HSC-PDR3 PSFs, there is a non-negligible impact on
the faint light present in the mock images. This impact could lead to incorrect
LSB measurements if a proper star subtraction is not applied.
