component
SMF4758A
Public Made by Adomby adom
Changjing Zener Diodes, SOD-123FL. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"distributor_links": {
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"checked_at": "2026-10-22T18:49:46Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "quota"
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"mouser": {
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{
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"name": "K",
"type": "passive",
"description": "Cathode, identified by the marking/cathode bar on the package; zener breakdown VZ is 53.20V nominal (50.54V-55.86V... see review) at IZT=4.5mA with reverse conduction through this pin."
},
{
"number": "2",
"name": "A",
"type": "passive",
"description": "Anode of the zener diode; forward voltage VF is max 1.5V at IF=200mA."
}
],
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"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: Datasheet has no pin number table; pins 1 (cathode) and 2 (anode) are assumed from the standard two-; Pin 1 description contains a VZ tolerance fragment I could not verify. The datasheet gives VZ for SM"
],
"pages_sent": 5,
"cost_usd": 0.0448,
"at": "2026-10-22T18:49:35"
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"sha256": "8f6e4acc3701b115",
"source_tier": "lcsc"
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"cad": "KiCad official (CC-BY-SA 4.0)",
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"total": 2,
"described": 2,
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"seat": "z = 0",
"extents_mm": [
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"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "132323445e3d1f9231e81c083cd88a33cd204dd8b96063bb2ed1f3ab4470c7e7",
"checked": "2026-10-22",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "smf4758a-etched.step",
"role": "eda",
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"sha256": "d52b280d13d8a83ba1375ea4b1e8a7e70e19728ae5289d6cd7ebd8693b98fd11",
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]
},
"metadata": {
"specs": {
"Manufacturer": "Changjing",
"Package": "SOD-123FL",
"Category": "Diodes",
"Pins": "2"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "8f6e4acc3701b11544fb4ba2e9cb9d0203f6c9b067dcb72e56ed9f70a1f813eb",
"rows": [
{
"name": "Zener voltage minimum",
"symbol": "VZ",
"kind": "electrical",
"unit": "V",
"min": 53.2,
"typ": 56,
"max": 58.8,
"conditions": "@IZT = 4.5 mA",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Test current",
"symbol": "IZT",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 4.5,
"max": null,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Maximum Zener impedance",
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"kind": "electrical",
"unit": "Ω",
"min": null,
"typ": null,
"max": 110,
"conditions": "@IZT",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Maximum Zener impedance (knee)",
"symbol": "ZZK",
"kind": "electrical",
"unit": "Ω",
"min": null,
"typ": null,
"max": 2000,
"conditions": "@IZK = 0.25 mA",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Reverse leakage current",
"symbol": "IR",
"kind": "electrical",
"unit": "uA",
"min": null,
"typ": null,
"max": 0.1,
"conditions": "@VR = 42.6 V",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Maximum DC Zener current",
"symbol": "IZM",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": null,
"max": 16,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Maximum surge current",
"symbol": "IRM",
"kind": "electrical",
"unit": "mApk",
"min": null,
"typ": null,
"max": 80,
"conditions": "non-repetitive 8.3ms pulse",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Forward voltage",
"symbol": "VF",
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"unit": "V",
"min": null,
"typ": null,
"max": 1.5,
"conditions": "IF=200mA",
"source_page": 1,
"source": "datasheet"
},
{
"name": "Power dissipation",
"symbol": "Pd",
"kind": "absolute_maximum",
"unit": "W",
"min": null,
"typ": null,
"max": 1,
"conditions": "TL=75℃",
"source_page": 1,
"source": "datasheet"
},
{
"name": "Junction and storage temperature range",
"symbol": "TJ,Tstg",
"kind": "absolute_maximum",
"unit": "℃",
"min": -55,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 1,
"source": "datasheet"
},
{
"name": "Thermal resistance junction to ambient",
"symbol": "RθJA",
"kind": "thermal",
"unit": "℃/W",
"min": null,
"typ": null,
"max": 170,
"conditions": "Between junction to ambient",
"source_page": 1,
"source": "datasheet"
},
{
"name": "Thermal resistance junction to lead",
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"unit": "℃/W",
"min": null,
"typ": null,
"max": 26,
"conditions": "Between junction to lead",
"source_page": 1,
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}
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"discovery_pitch": "SMF4758A (Changjing) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
"author": {
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"email": "[email protected]"
},
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