from jitx.anchor import Anchor
from jitx.component import Component
from jitx.container import inline
from jitx.feature import Courtyard, Custom, Silkscreen, Soldermask, Paste
from jitx.landpattern import Landpattern, Pad, PadMapping
from jitx.net import Port
from jitx.shapes.composites import rectangle
from jitx.shapes.primitive import Arc, ArcPolyline, Polygon, Polyline, Text
from jitx.symbol import Direction, Pin, Symbol, SymbolMapping
[docs]
class RectangleSMDPad(Pad):
shape = rectangle(1.25, 0.7)
soldermask = Soldermask(rectangle(1.352, 0.802))
paste = Paste(rectangle(1.352, 0.802))
[docs]
class BSS138(Component):
"""
BSS138 N-Channel MOSFET
50V 220mA 3.5Ω@10V,220mA 360mW N Channel SOT-23 MOSFET
Manufacturer: Changjiang Electronics Tech (CJ)
"""
name = "C78284"
description = "50V 220mA 3.5Ω@10V,220mA 360mW N Channel SOT-23 MOSFETs ROHS"
manufacturer = "Changjiang Electronics Tech (CJ)"
mpn = "BSS138"
datasheet = "https://datasheet.lcsc.com/lcsc/1809291614_Jiangsu-Changjing-Electronics-Technology-Co---Ltd--BSS138_C78284.pdf"
reference_designator_prefix = "Q"
# MOSFET pins
D = Port() # Drain
G = Port() # Gate
S = Port() # Source
@inline
class landpattern(Landpattern):
# Pads
p = {
1: RectangleSMDPad().at(1, -0.949),
2: RectangleSMDPad().at(1, 0.95),
3: RectangleSMDPad().at(-1, 0),
}
# Labels
labels = [
Silkscreen(Text(">REF", 0.5, Anchor.W).at(-0.75, 3.308)),
Custom(Text(">VALUE", 0.5, Anchor.W).at(-0.75, 2.308), name="Fab"),
]
# Silkscreen
silkscreen = [
Silkscreen(
Polyline(
0.152,
[(0.726, 1.527), (-0.726, 1.527), (-0.726, 0.495)],
)
),
Silkscreen(
Polyline(
0.152,
[(0.726, -1.526), (-0.726, -1.526), (-0.726, -0.494)],
)
),
Silkscreen(Polyline(0.152, [(0.726, 0.456), (0.726, -0.455)])),
]
# Fab drawing
fab_drawing = [
Custom(ArcPolyline(0.06, [Arc((1.2, -1.45), 0.03, 0, -360)]), name="Fab"),
Custom(ArcPolyline(0.2, [Arc((1.46, -1.1), 0.1, 0, -360)]), name="Fab"),
]
# Courtyard
courtyard = Courtyard(rectangle(3.352, 3.205))
@inline
class symbol(Symbol):
pin_name_size = 0.7
pad_name_size = 0.7
# Pin definitions
D = Pin((2, 2), 2, Direction.Up)
G = Pin((-2, 0), 2, Direction.Left)
S = Pin((2, -2), 2, Direction.Down)
# Text elements
value = Text(">VALUE", 0.7056, Anchor.C).at(0, 2.79)
reference = Text(">REF", 0.7056, Anchor.C).at(0, 3.57)
# Symbol artwork - N-Channel MOSFET symbol
art = [
# Channel connections
Polyline(0.2, [(0, 1.4), (2, 1.4), (2, 2), (4, 2), (4, 0.4)]),
Polyline(0.2, [(0, 0), (2, 0), (2, -2), (4, -2), (4, -0.6)]),
Polyline(0.2, [(2, -1.4), (0, -1.4)]),
# Gate structure
Polyline(0.2, [(-0.4, 1.8), (-0.4, -1.8)]),
Polyline(0.2, [(0, 1.8), (0, 1)]),
Polyline(0.2, [(0, -0.4), (0, 0.4)]),
Polyline(0.2, [(0, -1.8), (0, -1)]),
# Gate connection
Polyline(0.2, [(-2, 0), (-0.4, 0)]),
# Arrows/triangles
Polygon([(0, 0), (1.2, -0.4), (1.2, 0.4)]),
Polygon([(4, 0.4), (3.4, -0.6), (4.6, -0.6)]),
]
# Pin mapping
padmapping = PadMapping(
{
G: landpattern.p[1], # Gate
S: landpattern.p[2], # Source
D: landpattern.p[3], # Drain
}
)
# Symbol mapping
symbolmapping = SymbolMapping(
{
D: symbol.D,
G: symbol.G,
S: symbol.S,
}
)
Device: type[BSS138] = BSS138
