component
LP3981S-33B5F
Public Made by Adomby adom
LOWPOWER Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535
{
"schema_version": 1,
"type": "component",
"slug": "lp3981s-33b5f",
"title": "LP3981S-33B5F",
"brief": "LOWPOWER Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-5. 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",
"power management (pmic)",
"lp3981s-33b5f",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "LP3981S-33B5F",
"manufacturer": "LOWPOWER",
"package": "SOT-23-5",
"pin_count": 5,
"category": "Power Management (PMIC)",
"subcategory": "Voltage Regulators - Linear, Low Drop Out (LDO) Regulators",
"datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588941092545318912",
"parts": {
"symbol": "lp3981s-33b5f.kicad_sym",
"footprint": "lp3981s-33b5f.kicad_mod",
"model_3d": "lp3981s-33b5f-hero.glb",
"model_3d_plain": "lp3981s-33b5f-etched.glb",
"model_3d_step": "lp3981s-33b5f-etched.step",
"model_3d_step_plain": "lp3981s-33b5f.step",
"lbr": "lp3981s-33b5f.lbr"
},
"distributor_links": {
"lcsc": "C2890367"
},
"distributor_check": {
"checked_at": "2026-10-19T03:36:17Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "no match"
},
"mouser": {
"pn": null,
"status": "no match"
}
},
"pins": [
{
"number": "1",
"name": "IN",
"type": "power_in",
"description": "Power supply input pin; the datasheet recommends a supply input voltage of 2.5V to 5.5V and an under-voltage lockout threshold typically 1.5V."
},
{
"number": "2",
"name": "GND",
"type": "power_in",
"description": "Ground reference pin for the regulator."
},
{
"number": "3",
"name": "EN",
"type": "input",
"description": "Active-high chip enable input with an EN input voltage range of 0V to 5.5V and logic thresholds of 0.4V (low) and 1.4V (high); the pin is high impedance, so a 100kΩ pull-down to GND is recommended when the control signal is floating."
},
{
"number": "4",
"name": "NC",
"type": "unconnected",
"description": "No connection; the datasheet lists this pin as NC."
},
{
"number": "5",
"name": "OUT",
"type": "power_out",
"description": "Regulated output pin rated for 300mA output current (500mA peak) when VIN is above 2.8V, with an internal 120Ω active pull-down to GND that discharges the output when EN is logic low or in thermal shutdown."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
"factory": "2.0.0",
"extractor": "extract_pins 0.3",
"primary_model": "claude-haiku-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: The datasheet's pin table is for the SOT23-5 package only, which matches the B5 suffix in MPN LP3981; The document is marked 'Preliminary Datasheet' (LP3981S-01, Jan. 2021), so the pin data and limits m"
],
"pages_sent": 7,
"cost_usd": 0.0307,
"at": "2026-10-19T03:34:10"
},
"datasheet": {
"url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588941092545318912",
"pages": 7,
"sha256": "87a0e6202ae5fcdb",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 5,
"described": 5,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "lp3981s-33b5f.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
2.8,
2.9,
1.55
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "720a6eab0024069bbee68e7cb4c3ff1149468a34611225cdc852662c5d0ec2b7",
"checked": "2026-10-19",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "lp3981s-33b5f-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
2.8,
2.9,
1.55
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "d89fffadd74c84a10e9a9c617e29a3a1a285c786e7e8849bc0b27a926d566363",
"checked": "2026-10-19",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "LOWPOWER",
"Package": "SOT-23-5",
"Category": "Power Management (PMIC)",
"Pins": "5"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "87a0e6202ae5fcdb4460e7ba42c9717d20476703b8fb53cff5f06c8add879ab1",
"rows": [
{
"name": "Output Voltage Accuracy",
"symbol": "ΔVOUT",
"kind": "tolerance",
"unit": "%",
"min": -1,
"typ": null,
"max": 1,
"conditions": "IOUT=1mA",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Supply Input Voltage",
"symbol": "VIN",
"kind": "recommended_operating",
"unit": "V",
"min": 2.5,
"typ": null,
"max": 5.5,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "EN Input Voltage",
"symbol": "VEN",
"kind": "recommended_operating",
"unit": "V",
"min": 0,
"typ": null,
"max": 5.5,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Operation Junction Temperature Range",
"symbol": "TJ",
"kind": "recommended_operating",
"unit": "℃",
"min": -20,
"typ": null,
"max": 125,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Operation Ambient Temperature Range",
"symbol": "TA",
"kind": "recommended_operating",
"unit": "℃",
"min": -40,
"typ": null,
"max": 85,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Supply Input Voltage (absolute maximum)",
"symbol": "VIN",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 6,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Other Pins Voltage",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 6,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Power Dissipation SOT23-5",
"symbol": "PD",
"kind": "absolute_maximum",
"unit": "mW",
"min": null,
"typ": null,
"max": 400,
"conditions": "TA=25℃, SOT23-5",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Storage Temperature Range",
"symbol": "",
"kind": "absolute_maximum",
"unit": "℃",
"min": -65,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Lead Temperature (Soldering)",
"symbol": "",
"kind": "absolute_maximum",
"unit": "℃",
"min": null,
"typ": null,
"max": 260,
"conditions": "10 sec.",
"source_page": 3,
"source": "datasheet"
},
{
"name": "ESD HBM (Human Body Model)",
"symbol": "",
"kind": "absolute_maximum",
"unit": "KV",
"min": null,
"typ": null,
"max": 2,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "ESD MM (Machine Model)",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": null,
"typ": null,
"max": 200,
"conditions": "",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Standby Current",
"symbol": "ISTBY",
"kind": "electrical",
"unit": "μA",
"min": null,
"typ": 0.1,
"max": 1,
"conditions": "VEN=0V, Shutdown",
"source_page": 4,
"source": "datasheet"
},
{
"name": "EN Input Bias Current",
"symbol": "IIBSD",
"kind": "electrical",
"unit": "μA",
"min": null,
"typ": 0.6,
"max": 2,
"conditions": "VEN=1V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Output Current",
"symbol": "Iout",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 300,
"max": null,
"conditions": "VIN>2.8V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Current Limit",
"symbol": "ILIM",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 550,
"max": null,
"conditions": "RLOAD=1Ω",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Quiescent Current",
"symbol": "IQ",
"kind": "electrical",
"unit": "μA",
"min": null,
"typ": 58,
"max": null,
"conditions": "(VOUT+1V)<VIN<5.5V, VOUT=3.3V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Dropout Voltage",
"symbol": "VDROP",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": 260,
"max": null,
"conditions": "IOUT=300mA, VOUT=3.3V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Line Regulation",
"symbol": "ΔVOUT/(ΔVIN×VOUT)",
"kind": "electrical",
"unit": "%",
"min": null,
"typ": 0.5,
"max": null,
"conditions": "VOUT=3.3V, IOUT=1mA, VIN=4.3V to 5.5V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Load Regulation",
"symbol": "ΔVOUT/VOUT",
"kind": "electrical",
"unit": "%",
"min": null,
"typ": 1,
"max": null,
"conditions": "VOUT=3.3V, IOUT=1mA to 200mA",
"source_page": 4,
"source": "datasheet"
},
{
"name": "EN Logic-Low Voltage",
"symbol": "VIL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": 0.4,
"max": null,
"conditions": "VIN=(VOUT+1V) to 5.5V, Shutdown",
"source_page": 4,
"source": "datasheet"
},
{
"name": "EN Logic-High Voltage",
"symbol": "VIH",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": 1.4,
"max": null,
"conditions": "VIN=(VOUT+1V) to 5.5V, Start-Up",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Output Noise Voltage",
"symbol": "",
"kind": "electrical",
"unit": "μVRMS",
"min": null,
"typ": 100,
"max": null,
"conditions": "10Hz to 100kHz, IOUT=200mA, COUT=1µF",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Power Supply Rejection Rate (1 kHz)",
"symbol": "PSRR",
"kind": "electrical",
"unit": "dB",
"min": null,
"typ": -63,
"max": null,
"conditions": "f=1KHz, COUT=1µF, IOUT=50mA, VOUT=3.3V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Power Supply Rejection Rate (10 kHz)",
"symbol": "PSRR",
"kind": "electrical",
"unit": "dB",
"min": null,
"typ": -56,
"max": null,
"conditions": "f=10kHz, COUT=1µF, IOUT=50mA, VOUT=3.3V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Thermal Shutdown Temperature",
"symbol": "TSD",
"kind": "electrical",
"unit": "℃",
"min": null,
"typ": 160,
"max": null,
"conditions": "IOUT=0.1mA",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Package Thermal Resistance SOT23-5",
"symbol": "θJA",
"kind": "thermal",
"unit": "℃/W",
"min": null,
"typ": 250,
"max": null,
"conditions": "SOT23-5",
"source_page": 3,
"source": "datasheet"
}
]
}
},
"variants": [],
"sections": [
"hero",
"viewers",
"readme",
"breadcrumbs",
"info"
],
"discovery_triggers": [
"lp3981s-33b5f"
],
"discovery_pitch": "LP3981S-33B5F (LOWPOWER) 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",
"lp3981s-33b5f.kicad_sym",
"lp3981s-33b5f.kicad_mod",
"lp3981s-33b5f.glb",
"lp3981s-33b5f.step",
"lp3981s-33b5f.lbr",
"docs/hero.png",
"docs/lp3981s-33b5f-datasheet.pdf",
"viewers/symbol.html",
"viewers/footprint.html",
"lp3981s-33b5f-hero.glb",
"lp3981s-33b5f-hero.overlay.json",
"lp3981s-33b5f-etched.glb"
],
"visibility": {
"public": true
}
}