component
1SMB5349B
Public Made by Adomby adom
YFW Zener Diodes, SMB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361
{
"schema_version": 1,
"type": "component",
"slug": "1smb5349b",
"title": "1SMB5349B",
"brief": "YFW Zener Diodes, SMB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
"tags": [
"component",
"diodes",
"1smb5349b",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "1SMB5349B",
"manufacturer": "YFW",
"package": "SMB",
"pin_count": 2,
"category": "Diodes",
"subcategory": "Zener Diodes",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/66ccb6c033166bf4b876f62f8b759596.pdf",
"parts": {
"symbol": "1smb5349b.kicad_sym",
"footprint": "1smb5349b.kicad_mod",
"model_3d": "1smb5349b-hero.glb",
"model_3d_plain": "1smb5349b-etched.glb",
"model_3d_step": "1smb5349b-etched.step",
"model_3d_step_plain": "1smb5349b.step",
"lbr": "1smb5349b.lbr"
},
"distributor_links": {
"lcsc": "C20623355"
},
"distributor_check": {
"checked_at": "2026-10-22T14:31:04Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "no match"
},
"mouser": {
"pn": null,
"status": "no match"
}
},
"pins": [
{
"number": "1",
"name": "Cathode",
"type": "passive",
"description": "Cathode of the zener diode; operated at positive reverse voltage for regulation (zener voltage 3.3V to 200V series, 12 V for 1SMB5349B)."
},
{
"number": "2",
"name": "Anode",
"type": "passive",
"description": "Anode of the zener diode; maximum forward voltage 1.2 V at IF = 1.0 A."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
"factory": "2.0.0",
"extractor": "extract_pins 0.3",
"primary_model": "claude-sonnet-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: Datasheet table rows are not labeled with part names in the extracted text, so the 12 V zener value "
],
"pages_sent": 3,
"cost_usd": 0.0443,
"at": "2026-10-22T14:30:03"
},
"datasheet": {
"url": "https://datasheet.lcsc.com/datasheet/pdf/66ccb6c033166bf4b876f62f8b759596.pdf",
"pages": 3,
"sha256": "24001c3c727b3300",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 2,
"described": 2,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "1smb5349b.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
5.3,
3.55,
2.15
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "029466277d91e9f5492556be93e46611049e07115c7913880c547afa96058ed4",
"checked": "2026-10-22",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "1smb5349b-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
5.3,
3.55,
2.15
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "009d9dab1e9d9f9bc624e85fafb8a68aa997c85d1aad991002b033983d6050f5",
"checked": "2026-10-22",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "YFW",
"Package": "SMB",
"Category": "Diodes",
"Pins": "2"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "24001c3c727b33005e60755289bfbe749758f1aab822926ebf18c2c656730cd0",
"rows": [
{
"name": "Zener voltage tolerance (suffix B)",
"symbol": "VZ",
"kind": "tolerance",
"unit": "%",
"min": -5,
"typ": null,
"max": 5,
"conditions": "Suffix B indicates ±5% tolerance",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Nominal zener voltage",
"symbol": "VZ",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": 12,
"max": null,
"conditions": "@ IZT",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Maximum zener impedance",
"symbol": "ZZT",
"kind": "electrical",
"unit": "Ω",
"min": null,
"typ": null,
"max": 2.5,
"conditions": "@ IZT = 100 mA",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Maximum zener impedance at knee",
"symbol": "ZZK",
"kind": "electrical",
"unit": "Ω",
"min": null,
"typ": null,
"max": 125,
"conditions": "@ IZK = 1.0 mA",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Maximum reverse leakage current",
"symbol": "IR",
"kind": "electrical",
"unit": "μA",
"min": null,
"typ": null,
"max": 2,
"conditions": "@ VR = 9.1 V",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Maximum zener current",
"symbol": "IZM",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": null,
"max": 395,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Maximum surge current",
"symbol": "IZSM",
"kind": "electrical",
"unit": "A",
"min": null,
"typ": null,
"max": 7.5,
"conditions": "Non-recurrent half-sine wave, 8.3 ms",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Maximum regulator voltage",
"symbol": "ΔVZ",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.25,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Maximum forward voltage",
"symbol": "VF",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 1.2,
"conditions": "IF = 1.0 A",
"source_page": 1,
"source": "datasheet"
},
{
"name": "Power dissipation",
"symbol": "PD",
"kind": "absolute_maximum",
"unit": "W",
"min": null,
"typ": null,
"max": 5,
"conditions": "TL = 25 °C",
"source_page": 1,
"source": "datasheet"
},
{
"name": "Operating and storage temperature range",
"symbol": "TJ, TSTG",
"kind": "absolute_maximum",
"unit": "°C",
"min": -65,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 1,
"source": "datasheet"
},
{
"name": "Thermal resistance, junction to ambient",
"symbol": "RθJA",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": null,
"max": 90,
"conditions": "Mounted on FR4 PC board (1 oz Cu) with recommended footprint",
"source_page": 1,
"source": "datasheet"
},
{
"name": "Thermal resistance, junction to lead",
"symbol": "RθJL",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": null,
"max": 25,
"conditions": "Mounted on FR4 PC board (1 oz Cu) with recommended footprint",
"source_page": 1,
"source": "datasheet"
},
{
"name": "Test current",
"symbol": "IZT",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 100,
"max": null,
"conditions": "",
"source_page": 2,
"source": "datasheet"
}
]
}
},
"variants": [],
"sections": [
"hero",
"viewers",
"readme",
"breadcrumbs",
"info"
],
"discovery_triggers": [
"1smb5349b"
],
"discovery_pitch": "1SMB5349B (YFW) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
"author": {
"name": "Ray",
"email": "[email protected]"
},
"dependencies": {},
"hero": {
"type": "image",
"path": "docs/hero.png"
},
"files": [
"page.json",
"README.md",
"1smb5349b.kicad_sym",
"1smb5349b.kicad_mod",
"1smb5349b.glb",
"1smb5349b.step",
"1smb5349b.lbr",
"docs/hero.png",
"docs/1smb5349b-datasheet.pdf",
"viewers/symbol.html",
"viewers/footprint.html",
"1smb5349b-hero.glb",
"1smb5349b-hero.overlay.json",
"1smb5349b-etched.glb"
],
"visibility": {
"public": true
}
}