component
PCF8574
Public Made by Adomby adom
TI remote 8-bit I2C I/O expander, SOIC-16. Eight quasi-bidirectional lines, 3 address pins, open-drain INT. Datasheet-verified.
← Commit history
Targeted fixes, page content unchanged: pcf8574.lbr; models_3d
2 files changed
+105−45
page.json+42−2@@ -150,7 +150,47 @@ "viewers": { "symbol": "viewers/symbol.html", "footprint": "viewers/footprint.html"- }+ },+ "models_3d": [+ {+ "file": "pcf8574.step",+ "role": "plain",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 6.0,+ 9.9,+ 1.75+ ],+ "zmin_mm": -0.0,+ "centre_offset_mm": 0.0,+ "footprint_binding": "identity",+ "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",+ "checked": "2026-11-10",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ },+ {+ "file": "pcf8574-etched.step",+ "role": "plain",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 6.0,+ 9.9,+ 1.78+ ],+ "zmin_mm": -0.0,+ "centre_offset_mm": 0.0,+ "footprint_binding": "identity",+ "sha256": "811ee094c3774ebf38ca00231acdfd140350765b02ffb30ebee2a0c2bb6ff68c",+ "checked": "2026-11-10",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ }+ ] }, "metadata": { "specs": {@@ -211,4 +251,4 @@ "kind": "packaging" } ]-}+}
pcf8574.lbr+63−43@@ -52,24 +52,36 @@ <library> <description>8-bit I/O Expander, I2C / SMBus interface, interrupt output, fixed address bits 0b0100xxx, TSSOP-16 / SOIC-16</description> <packages>-<package name="PCF8574T">- <description>PCF8574T</description>- <smd name="1" x="-2.4750" y="4.4450" dx="1.9500" dy="0.6000" layer="1"/>- <smd name="2" x="-2.4750" y="3.1750" dx="1.9500" dy="0.6000" layer="1"/>- <smd name="3" x="-2.4750" y="1.9050" dx="1.9500" dy="0.6000" layer="1"/>- <smd name="4" x="-2.4750" y="0.6350" dx="1.9500" dy="0.6000" layer="1"/>- <smd name="5" x="-2.4750" y="-0.6350" dx="1.9500" dy="0.6000" layer="1"/>- <smd name="6" x="-2.4750" y="-1.9050" dx="1.9500" dy="0.6000" layer="1"/>- <smd name="7" x="-2.4750" y="-3.1750" dx="1.9500" dy="0.6000" layer="1"/>- <smd name="8" x="-2.4750" y="-4.4450" dx="1.9500" dy="0.6000" layer="1"/>- <smd name="9" x="2.4750" y="-4.4450" dx="1.9500" dy="0.6000" layer="1"/>- <smd name="10" x="2.4750" y="-3.1750" dx="1.9500" dy="0.6000" layer="1"/>- <smd name="11" x="2.4750" y="-1.9050" dx="1.9500" dy="0.6000" layer="1"/>- <smd name="12" x="2.4750" y="-0.6350" dx="1.9500" dy="0.6000" layer="1"/>- <smd name="13" x="2.4750" y="0.6350" dx="1.9500" dy="0.6000" layer="1"/>- <smd name="14" x="2.4750" y="1.9050" dx="1.9500" dy="0.6000" layer="1"/>- <smd name="15" x="2.4750" y="3.1750" dx="1.9500" dy="0.6000" layer="1"/>- <smd name="16" x="2.4750" y="4.4450" dx="1.9500" dy="0.6000" layer="1"/>+<package name="SOIC-16_3.9x9.9mm_P1.27mm">+ <description>SOIC-16, 3.9 x 9.9 mm, 1.27 mm pitch</description>+ <smd name="1" x="-2.4750" y="4.4450" dx="1.9500" dy="0.6000" layer="1" roundness="50"/>+ <smd name="2" x="-2.4750" y="3.1750" dx="1.9500" dy="0.6000" layer="1" roundness="50"/>+ <smd name="3" x="-2.4750" y="1.9050" dx="1.9500" dy="0.6000" layer="1" roundness="50"/>+ <smd name="4" x="-2.4750" y="0.6350" dx="1.9500" dy="0.6000" layer="1" roundness="50"/>+ <smd name="5" x="-2.4750" y="-0.6350" dx="1.9500" dy="0.6000" layer="1" roundness="50"/>+ <smd name="6" x="-2.4750" y="-1.9050" dx="1.9500" dy="0.6000" layer="1" roundness="50"/>+ <smd name="7" x="-2.4750" y="-3.1750" dx="1.9500" dy="0.6000" layer="1" roundness="50"/>+ <smd name="8" x="-2.4750" y="-4.4450" dx="1.9500" dy="0.6000" layer="1" roundness="50"/>+ <smd name="9" x="2.4750" y="-4.4450" dx="1.9500" dy="0.6000" layer="1" roundness="50"/>+ <smd name="10" x="2.4750" y="-3.1750" dx="1.9500" dy="0.6000" layer="1" roundness="50"/>+ <smd name="11" x="2.4750" y="-1.9050" dx="1.9500" dy="0.6000" layer="1" roundness="50"/>+ <smd name="12" x="2.4750" y="-0.6350" dx="1.9500" dy="0.6000" layer="1" roundness="50"/>+ <smd name="13" x="2.4750" y="0.6350" dx="1.9500" dy="0.6000" layer="1" roundness="50"/>+ <smd name="14" x="2.4750" y="1.9050" dx="1.9500" dy="0.6000" layer="1" roundness="50"/>+ <smd name="15" x="2.4750" y="3.1750" dx="1.9500" dy="0.6000" layer="1" roundness="50"/>+ <smd name="16" x="2.4750" y="4.4450" dx="1.9500" dy="0.6000" layer="1" roundness="50"/>+ <polygon width="0.1200" layer="21">+ <vertex x="-2.6000" y="5.0100"/>+ <vertex x="-2.8400" y="5.3400"/>+ <vertex x="-2.3600" y="5.3400"/>+ </polygon>+ <polygon width="0.1000" layer="51">+ <vertex x="-0.9750" y="4.9500"/>+ <vertex x="1.9500" y="4.9500"/>+ <vertex x="1.9500" y="-4.9500"/>+ <vertex x="-1.9500" y="-4.9500"/>+ <vertex x="-1.9500" y="3.9750"/>+ </polygon> <wire x1="-2.0600" y1="5.0600" x2="2.0600" y2="5.0600" width="0.1200" layer="21"/> <wire x1="-2.0600" y1="5.0050" x2="-2.0600" y2="5.0600" width="0.1200" layer="21"/> <wire x1="-2.0600" y1="-5.0600" x2="-2.0600" y2="-5.0050" width="0.1200" layer="21"/>@@ -82,28 +94,29 @@ </packages> <symbols> <symbol name="PCF8574T">- <wire x1="-7.62" y1="12.7" x2="7.62" y2="12.7" width="0.254" layer="94"/>- <wire x1="7.62" y1="12.7" x2="7.62" y2="-10.16" width="0.254" layer="94"/>- <wire x1="7.62" y1="-10.16" x2="-7.62" y2="-10.16" width="0.254" layer="94"/>- <wire x1="-7.62" y1="-10.16" x2="-7.62" y2="12.7" width="0.254" layer="94"/>- <text x="0" y="15.239999999999998" size="1.27" layer="95" align="bottom-center">>NAME</text>- <text x="0" y="-12.7" size="1.27" layer="96" align="top-center">>VALUE</text>- <pin name="A0" x="-10.16" y="-2.54" length="short" direction="in"/>- <pin name="A1" x="-10.16" y="-5.08" length="short" direction="in"/>- <pin name="A2" x="-10.16" y="-7.62" length="short" direction="in"/>- <pin name="P0" x="10.16" y="10.16" length="short" direction="io" rot="R180"/>- <pin name="P1" x="10.16" y="7.62" length="short" direction="io" rot="R180"/>- <pin name="P2" x="10.16" y="5.08" length="short" direction="io" rot="R180"/>- <pin name="P3" x="10.16" y="2.54" length="short" direction="io" rot="R180"/>- <pin name="GND" x="0" y="-12.7" length="short" direction="pwr" rot="R90"/>- <pin name="P4" x="10.16" y="0" length="short" direction="io" rot="R180"/>- <pin name="P5" x="10.16" y="-2.54" length="short" direction="io" rot="R180"/>- <pin name="P6" x="10.16" y="-5.08" length="short" direction="io" rot="R180"/>- <pin name="P7" x="10.16" y="-7.62" length="short" direction="io" rot="R180"/>- <pin name="~{INT}" x="-10.16" y="2.54" length="short" direction="oc"/>- <pin name="SCL" x="-10.16" y="10.16" length="short" direction="in"/>- <pin name="SDA" x="-10.16" y="7.62" length="short" direction="io"/>- <pin name="VDD" x="0" y="15.24" length="short" direction="pwr" rot="R270"/>+ <description>8-bit I/O Expander, I2C / SMBus interface, interrupt output, fixed address bits 0b0100xxx, TSSOP-16 / SOIC-16</description>+ <wire x1="-10.16" y1="15.239999999999998" x2="10.16" y2="15.239999999999998" width="0.254" layer="94"/>+ <wire x1="10.16" y1="15.239999999999998" x2="10.16" y2="-15.239999999999998" width="0.254" layer="94"/>+ <wire x1="10.16" y1="-15.239999999999998" x2="-10.16" y2="-15.239999999999998" width="0.254" layer="94"/>+ <wire x1="-10.16" y1="-15.239999999999998" x2="-10.16" y2="15.239999999999998" width="0.254" layer="94"/>+ <text x="-7.1120" y="14.7320" size="1.27" layer="95" align="center">>NAME</text>+ <text x="3.3020" y="14.7320" size="1.27" layer="96" align="center">>VALUE</text>+ <pin name="A0" x="-15.24" y="12.7" length="middle" direction="in"/>+ <pin name="A1" x="-15.24" y="10.16" length="middle" direction="in"/>+ <pin name="A2" x="-15.24" y="7.619999999999999" length="middle" direction="in"/>+ <pin name="P0" x="15.24" y="12.7" length="middle" direction="io" rot="R180"/>+ <pin name="P1" x="15.24" y="10.16" length="middle" direction="io" rot="R180"/>+ <pin name="P2" x="15.24" y="7.619999999999999" length="middle" direction="io" rot="R180"/>+ <pin name="P3" x="15.24" y="5.079999999999999" length="middle" direction="io" rot="R180"/>+ <pin name="GND" x="-15.24" y="0" length="middle" direction="pwr"/>+ <pin name="P4" x="15.24" y="2.539999999999999" length="middle" direction="io" rot="R180"/>+ <pin name="P5" x="15.24" y="0" length="middle" direction="io" rot="R180"/>+ <pin name="P6" x="15.24" y="-2.540000000000001" length="middle" direction="io" rot="R180"/>+ <pin name="P7" x="15.24" y="-5.080000000000002" length="middle" direction="io" rot="R180"/>+ <pin name="!INT!" x="15.24" y="-12.7" length="middle" direction="oc" rot="R180"/>+ <pin name="SCL" x="-15.24" y="5.079999999999999" length="middle" direction="in"/>+ <pin name="SDA" x="15.24" y="-10.16" length="middle" direction="io" rot="R180"/>+ <pin name="VDD" x="-15.24" y="-2.540000000000001" length="middle" direction="pwr"/> </symbol> </symbols> <devicesets>@@ -113,7 +126,7 @@ <gate name="G$1" symbol="PCF8574T" x="0" y="0"/> </gates> <devices>- <device name="" package="PCF8574T">+ <device name="" package="SOIC-16_3.9x9.9mm_P1.27mm"> <connects> <connect gate="G$1" pin="A0" pad="1"/> <connect gate="G$1" pin="A1" pad="2"/>@@ -127,12 +140,19 @@ <connect gate="G$1" pin="P5" pad="10"/> <connect gate="G$1" pin="P6" pad="11"/> <connect gate="G$1" pin="P7" pad="12"/>- <connect gate="G$1" pin="~{INT}" pad="13"/>+ <connect gate="G$1" pin="!INT!" pad="13"/> <connect gate="G$1" pin="SCL" pad="14"/> <connect gate="G$1" pin="SDA" pad="15"/> <connect gate="G$1" pin="VDD" pad="16"/> </connects>- <technologies><technology name=""/></technologies>+ <technologies>+ <technology name="">+ <attribute name="MPN" value="PCF8574" constant="no"/>+ <attribute name="MANUFACTURER" value="Texas Instruments" constant="no"/>+ <attribute name="DATASHEET" value="https://www.ti.com/lit/ds/symlink/pcf8574.pdf" constant="no"/>+ <attribute name="ADOM_WIKI" value="https://wiki.adom.inc/adom/pcf8574" constant="no"/>+ </technology>+ </technologies> </device> </devices> </deviceset>