component
MC74HC4538ADR2G
Public Made by Adomby adom
onsemi Monostable Multivibrators, SOIC-16. Pinout settled in review by an AI reviewer against the manufacturer's datasheet, KiCad symbol/footprint/3D.
main
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275
{
"slug": "mc74hc4538adr2g",
"version": "0.1.1",
"type": "component",
"description": "onsemi Monostable Multivibrators, SOIC-16. Pinout settled in review by an AI reviewer against the manufacturer's datasheet, KiCad symbol/footprint/3D.",
"tags": [
"component",
"logic ics",
"mc74hc4538adr2g",
"factory-2.0.0",
"extractor-text"
],
"dependencies": {},
"hero": {
"type": "image",
"path": "docs/hero.png"
},
"files": [
"page.json",
"README.md",
"mc74hc4538adr2g.kicad_sym",
"mc74hc4538adr2g.kicad_mod",
"mc74hc4538adr2g.glb",
"mc74hc4538adr2g.step",
"mc74hc4538adr2g.lbr",
"docs/hero.png",
"docs/mc74hc4538adr2g-datasheet.pdf",
"viewers/symbol.html",
"viewers/footprint.html",
"mc74hc4538adr2g-hero.glb",
"mc74hc4538adr2g-hero.overlay.json",
"mc74hc4538adr2g-etched.glb"
],
"component": {
"mpn": "MC74HC4538ADR2G",
"manufacturer": "onsemi",
"package": "SOIC-16",
"pin_count": 16,
"category": "Logic ICs",
"subcategory": "Monostable Multivibrators",
"datasheet": "https://www.onsemi.com/pdf/datasheet/mc74hc4538a-d.pdf",
"parts": {
"symbol": "mc74hc4538adr2g.kicad_sym",
"footprint": "mc74hc4538adr2g.kicad_mod",
"model_3d": "mc74hc4538adr2g-hero.glb",
"model_3d_plain": "mc74hc4538adr2g-etched.glb",
"model_3d_step": "mc74hc4538adr2g-etched.step",
"model_3d_step_plain": "mc74hc4538adr2g.step",
"lbr": "mc74hc4538adr2g.lbr"
},
"distributor_links": {
"lcsc": "C233614",
"digikey": "MC74HC4538ADR2GOSTR-ND",
"mouser": "863-MC74HC4538ADR2G"
},
"distributor_check": {
"checked_at": "2026-11-06T00:02:14Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "MC74HC4538ADR2GOSTR-ND",
"status": "found"
},
"mouser": {
"pn": "863-MC74HC4538ADR2G",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "GND",
"type": "power_in",
"description": "External ground; the external timing capacitors discharge to ground through this pin, and it must be hard-wired to GND."
},
{
"number": "2",
"name": "CX1/RX1",
"type": "passive",
"description": "External timing component connection for multivibrator 1, tied to the common point of Rx and Cx; polystyrene capacitors are recommended and electrolytic capacitors are not recommended due to high leakage."
},
{
"number": "3",
"name": "RESET 1",
"type": "input",
"description": "Active-low reset input; a low level forces Q1 low and NQ1 high regardless of the output pulse circuitry."
},
{
"number": "4",
"name": "A1",
"type": "input",
"description": "Positive-edge trigger input for multivibrator 1, triggered by a rising edge when B1 is high."
},
{
"number": "5",
"name": "B1",
"type": "input",
"description": "Negative-edge trigger input for multivibrator 1, triggered by a falling edge when A1 is low."
},
{
"number": "6",
"name": "Q1",
"type": "output",
"description": "Noninverted monostable output 1, normally low, pulsing high when multivibrator 1 is triggered; pulse width set by Rx and Cx."
},
{
"number": "7",
"name": "NQ1",
"type": "output",
"description": "Inverted monostable output 1, normally high, pulsing low when multivibrator 1 is triggered."
},
{
"number": "8",
"name": "GND",
"type": "power_in",
"description": "Ground connection, identified as GND (pin 8) on the logic diagram."
},
{
"number": "9",
"name": "NQ2",
"type": "output",
"description": "Inverted monostable output 2, normally high, pulsing low when multivibrator 2 is triggered."
},
{
"number": "10",
"name": "Q2",
"type": "output",
"description": "Noninverted monostable output 2, normally low, pulsing high when multivibrator 2 is triggered; pulse width set by Rx and Cx."
},
{
"number": "11",
"name": "B2",
"type": "input",
"description": "Negative-edge trigger input for multivibrator 2, triggered by a falling edge when A2 is low."
},
{
"number": "12",
"name": "A2",
"type": "input",
"description": "Positive-edge trigger input for multivibrator 2, triggered by a rising edge when B2 is high."
},
{
"number": "13",
"name": "RESET 2",
"type": "input",
"description": "Active-low reset input; a low level forces Q2 low and NQ2 high regardless of the output pulse circuitry."
},
{
"number": "14",
"name": "CX2/RX2",
"type": "passive",
"description": "External timing component connection for multivibrator 2, tied to the common point of Rx and Cx; polystyrene capacitors are recommended and electrolytic capacitors are not recommended due to high leakage."
},
{
"number": "15",
"name": "GND",
"type": "power_in",
"description": "External ground; the external timing capacitors discharge to ground through this pin, and it must be hard-wired to GND."
},
{
"number": "16",
"name": "VCC",
"type": "power_in",
"description": "Positive supply pin (pin 16 = VCC on the logic diagram); the datasheet specifies VCC of 2.0 V to 6.0 V referenced to GND."
}
],
"provenance": {
"extractor": "ds2sf",
"datasheet": {
"url": "https://www.onsemi.com/pdf/datasheet/mc74hc4538a-d.pdf",
"pages": 15,
"sha256": "07efc7703fe04933",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 16,
"described": 16,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "mc74hc4538adr2g.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": "2026-11-06",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "mc74hc4538adr2g-etched.step",
"role": "eda",
"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": "8add20d01c5d065794c141e70ec8e5bed0f2fd41d7c37c770b1d2a8686b2eb3a",
"checked": "2026-11-06",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
],
"package_dims": {
"package_code": "SOIC-16 (CASE 751B)",
"source_page": 13,
"D": {
"nom_mm": 9.9,
"range_mm": [
9.8,
10.0
]
},
"E1": {
"nom_mm": 3.9,
"range_mm": [
3.8,
4.0
]
},
"E": {
"nom_mm": 6.0,
"range_mm": [
5.8,
6.2
]
},
"e": {
"nom_mm": 1.27,
"range_mm": [
null,
null
]
},
"A": {
"nom_mm": 1.55,
"range_mm": [
1.35,
1.75
]
},
"source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
"model_check": {
"file": "mc74hc4538adr2g.step",
"verdict": "PASS",
"reasons": [
"height and body within the datasheet's package drawing"
],
"by": "factory/package_fit.py"
}
}
}
}