component
SZ1SMB43AT3G
Public Made by Adomby adom
Littelfuse TVS, SMB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374
{
"schema_version": 1,
"type": "component",
"slug": "sz1smb43at3g",
"title": "SZ1SMB43AT3G",
"brief": "Littelfuse TVS, 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",
"tvs-fuse-board level protection",
"sz1smb43at3g",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "SZ1SMB43AT3G",
"manufacturer": "Littelfuse",
"package": "SMB",
"pin_count": 2,
"category": "TVS/Fuse/Board Level Protection",
"subcategory": "TVS",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/b5316952a361ba42eae06afea090b541.pdf",
"parts": {
"symbol": "sz1smb43at3g.kicad_sym",
"footprint": "sz1smb43at3g.kicad_mod",
"model_3d": "sz1smb43at3g-hero.glb",
"model_3d_plain": "sz1smb43at3g-etched.glb",
"model_3d_step": "sz1smb43at3g-etched.step",
"model_3d_step_plain": "sz1smb43at3g.step",
"lbr": "sz1smb43at3g.lbr"
},
"distributor_links": {
"lcsc": "C3712449",
"digikey": "F11563TR-ND",
"mouser": "863-SZ1SMB43AT3G"
},
"distributor_check": {
"checked_at": "2026-10-27T00:29:52Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "F11563TR-ND",
"status": "found",
"lifecycle": "Active"
},
"mouser": {
"pn": "863-SZ1SMB43AT3G",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "Cathode",
"type": "passive",
"description": "Cathode of the unidirectional TVS diode, marked by the color band; connect to the positive/protected line, with VRWM of 43 V and VBR of 47.8 V to 52.8 V at 1.0 mA."
},
{
"number": "2",
"name": "Anode",
"type": "passive",
"description": "Anode of the unidirectional TVS diode, normally connected to ground; clamps at VC 69.4 V at IPP 8.6 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: Pin 1 = Cathode and pin 2 = Anode are taken from the package drawing labels on page 7; the datasheet"
],
"pages_sent": 7,
"cost_usd": 0.0817,
"at": "2026-10-27T00:28:57"
},
"datasheet": {
"url": "https://datasheet.lcsc.com/datasheet/pdf/b5316952a361ba42eae06afea090b541.pdf",
"pages": 7,
"sha256": "9b427104bf8c86ce",
"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": "sz1smb43at3g.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": "2026-10-27",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "sz1smb43at3g-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": "51bd44e3b5fe4821e328fb38a242148756d103468eea95c5ad52b36701c4d6e0",
"checked": "2026-10-27",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "Littelfuse",
"Package": "SMB",
"Category": "TVS/Fuse/Board Level Protection",
"Pins": "2"
},
"appearance": {
"contacts": {
"quote": "the terminal finish material is tin(Sn) (IPC/JEDEC J-STD609A.01)",
"page": 1,
"doc": "ds.pdf",
"plating": "tin"
},
"version": 1,
"datasheet_sha256": "9b427104bf8c86ce6270a2e52adf42440173c04968bbc122e5fa4fdec81c15be"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "9b427104bf8c86ce6270a2e52adf42440173c04968bbc122e5fa4fdec81c15be",
"rows": [
{
"name": "Breakdown Voltage",
"symbol": "VBR",
"kind": "electrical",
"unit": "V",
"min": 47.8,
"typ": 50.3,
"max": 52.8,
"conditions": "@ IT = 1.0 mA, TA=25°C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Working Peak Reverse Voltage",
"symbol": "VRWM",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": 43,
"max": null,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Maximum Reverse Leakage Current",
"symbol": "IR",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": null,
"max": 5,
"conditions": "@ VRWM",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Clamping Voltage",
"symbol": "VC",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 69.4,
"conditions": "@ IPP = 8.6 A",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Maximum Reverse Peak Pulse Current",
"symbol": "IPP",
"kind": "electrical",
"unit": "A",
"min": null,
"typ": null,
"max": 8.6,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Forward Voltage",
"symbol": "VF",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 3.5,
"conditions": "IF = 30 A, TA=25°C, uni-directional",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Peak Power Dissipation",
"symbol": "PPK",
"kind": "absolute_maximum",
"unit": "W",
"min": null,
"typ": null,
"max": 600,
"conditions": "TL = 25°C, Pulse Width = 1 ms, 10/1000 µs non-repetitive",
"source_page": 1,
"source": "datasheet"
},
{
"name": "DC Power Dissipation (lead)",
"symbol": "PD",
"kind": "absolute_maximum",
"unit": "W",
"min": null,
"typ": null,
"max": 3,
"conditions": "TL = 75°C, zero lead length, 1\" square copper pad FR-4",
"source_page": 1,
"source": "datasheet"
},
{
"name": "DC Power Dissipation (ambient)",
"symbol": "PD",
"kind": "absolute_maximum",
"unit": "W",
"min": null,
"typ": null,
"max": 0.55,
"conditions": "TA = 25°C, FR-4 board, minimum recommended footprint",
"source_page": 1,
"source": "datasheet"
},
{
"name": "Forward Surge Current",
"symbol": "IFSM",
"kind": "absolute_maximum",
"unit": "A",
"min": null,
"typ": null,
"max": 100,
"conditions": "TA = 25°C, 1/2 sine wave PW = 8.3 ms, uni-directional only",
"source_page": 1,
"source": "datasheet"
},
{
"name": "Operating and Storage Temperature Range",
"symbol": "TJ, Tstg",
"kind": "absolute_maximum",
"unit": "°C",
"min": -65,
"typ": null,
"max": 175,
"conditions": "",
"source_page": 1,
"source": "datasheet"
},
{
"name": "Thermal Resistance Junction-to-Lead",
"symbol": "RƟJL",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": null,
"max": 25,
"conditions": "",
"source_page": 1,
"source": "datasheet"
},
{
"name": "Thermal Resistance Junction-to-Ambient",
"symbol": "RƟJA",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": null,
"max": 100,
"conditions": "",
"source_page": 1,
"source": "datasheet"
},
{
"name": "Capacitance",
"symbol": "C",
"kind": "electrical",
"unit": "pF",
"min": null,
"typ": 400,
"max": null,
"conditions": "Bias Voltage = 0 V, F = 1 MHz, TJ = 25°C",
"source_page": 3,
"source": "datasheet"
}
]
}
},
"variants": [],
"sections": [
"hero",
"viewers",
"readme",
"breadcrumbs",
"info"
],
"discovery_triggers": [
"sz1smb43at3g"
],
"discovery_pitch": "SZ1SMB43AT3G (Littelfuse) 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",
"sz1smb43at3g.kicad_sym",
"sz1smb43at3g.kicad_mod",
"sz1smb43at3g.glb",
"sz1smb43at3g.step",
"sz1smb43at3g.lbr",
"docs/hero.png",
"docs/sz1smb43at3g-datasheet.pdf",
"viewers/symbol.html",
"viewers/footprint.html",
"sz1smb43at3g-hero.glb",
"sz1smb43at3g-hero.overlay.json",
"sz1smb43at3g-etched.glb"
],
"visibility": {
"public": true
}
}