component
UM1540S-33
Public Made by Adomby adom
Union Semiconductor Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523
{
"schema_version": 1,
"type": "component",
"slug": "um1540s-33",
"title": "UM1540S-33",
"brief": "Union Semiconductor Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT23-5. 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)",
"um1540s-33",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "UM1540S-33",
"manufacturer": "Union Semiconductor",
"package": "SOT23-5",
"pin_count": 5,
"category": "Power Management (PMIC)",
"subcategory": "Voltage Regulators - Linear, Low Drop Out (LDO) Regulators",
"datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603085519282982912",
"parts": {
"symbol": "um1540s-33.kicad_sym",
"footprint": "um1540s-33.kicad_mod",
"model_3d": "um1540s-33-hero.glb",
"model_3d_plain": "um1540s-33-etched.glb",
"model_3d_step": "um1540s-33-etched.step",
"model_3d_step_plain": "um1540s-33.step",
"lbr": "um1540s-33.lbr"
},
"distributor_links": {
"lcsc": "C7542870"
},
"distributor_check": {
"checked_at": "2026-10-17T15:29:15Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "quota"
},
"mouser": {
"pn": null,
"status": "quota"
}
},
"pins": [
{
"number": "1",
"name": "VIN",
"type": "power_in",
"description": "Supply input for the LDO, with an input voltage range of 1.8V to 6V and an absolute maximum of -0.3V to +6.5V."
},
{
"number": "2",
"name": "GND",
"type": "power_in",
"description": "Ground pin for the regulator, which the datasheet says should be connected to ground."
},
{
"number": "3",
"name": "SHDN",
"type": "input",
"description": "Shutdown control input: high (VIH min 1.2V) activates the LDO and low (VIL max 0.4V) shuts it down."
},
{
"number": "4",
"name": "NC",
"type": "unconnected",
"description": "Not connected."
},
{
"number": "5",
"name": "VOUT",
"type": "power_out",
"description": "Regulated output of the LDO; the UM1540S-33 gives a fixed 3.3V output, with up to 300mA output current guaranteed."
}
],
"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 pin-description table on page 4 is garbled in the text extraction. The SOT23-5 column (UM1540S) ; The datasheet lists the SHDN pin only for UM1540 (the shutdown-enabled variant), and the SOT23-5 pin"
],
"pages_sent": 17,
"cost_usd": 0.0517,
"at": "2026-10-17T15:27:14"
},
"datasheet": {
"url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603085519282982912",
"pages": 17,
"sha256": "a2304bd57b300151",
"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": "um1540s-33.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": "2026-10-17",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "um1540s-33-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": "9d487562cf89c8dcece2f998d39b3b111fa59907fe2d2b086393f29190c48bb3",
"checked": "2026-10-17",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "Union Semiconductor",
"Package": "SOT23-5",
"Category": "Power Management (PMIC)",
"Pins": "5"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "a2304bd57b300151cb6568e1edac15e32fe90faa1748029e3a6c229f03b2296a",
"rows": [
{
"name": "Supply Voltage on VIN Pin",
"symbol": "VIN",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 6.5,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Voltage on VOUT Pin",
"symbol": "VOUT",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 6.5,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Operating Junction Temperature",
"symbol": "TJ",
"kind": "absolute_maximum",
"unit": "°C",
"min": -40,
"typ": null,
"max": 125,
"conditions": "Note 2, 3",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Storage Temperature Range",
"symbol": "TSTG",
"kind": "absolute_maximum",
"unit": "°C",
"min": -65,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Lead Temperature for Soldering",
"symbol": "TL",
"kind": "absolute_maximum",
"unit": "°C",
"min": null,
"typ": null,
"max": 260,
"conditions": "10 seconds",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Power Dissipation @25°C (SOT23-5)",
"symbol": "PD",
"kind": "absolute_maximum",
"unit": "W",
"min": null,
"typ": null,
"max": 0.43,
"conditions": "Note 4, SOT23-5, @25°C",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Package Thermal Resistance (SOT23-5)",
"symbol": "θJA",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": null,
"max": 230,
"conditions": "SOT23-5",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Input Voltage Range",
"symbol": "VIN",
"kind": "electrical",
"unit": "V",
"min": 1.8,
"typ": null,
"max": 6,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Output Voltage Range",
"symbol": "VOUT",
"kind": "electrical",
"unit": "V",
"min": 1.2,
"typ": null,
"max": 5,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Operating Quiescent Current",
"symbol": "IQ",
"kind": "electrical",
"unit": "μA",
"min": null,
"typ": 1,
"max": 1.5,
"conditions": "VIN=5V, IOUT=0mA",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Shut Down Quiescent Current",
"symbol": "",
"kind": "electrical",
"unit": "μA",
"min": null,
"typ": null,
"max": 1,
"conditions": "VIN=5V, SHDN = GND",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Input Current",
"symbol": "ISHDN",
"kind": "electrical",
"unit": "μA",
"min": null,
"typ": null,
"max": 1,
"conditions": "SHDN=VIN or GND",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Output Current",
"symbol": "IOUT",
"kind": "electrical",
"unit": "mA",
"min": 300,
"typ": null,
"max": null,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Output Voltage Accuracy",
"symbol": "",
"kind": "tolerance",
"unit": "%",
"min": -2.5,
"typ": null,
"max": 2.5,
"conditions": "1mA≤IOUT≤250mA",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Dropout Voltage",
"symbol": "ΔVDO",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": 250,
"max": 330,
"conditions": "IOUT=200mA",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Output Current Limit",
"symbol": "ILIMIT",
"kind": "electrical",
"unit": "mA",
"min": 350,
"typ": 450,
"max": 550,
"conditions": "RL=1Ω",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Startup Time Response",
"symbol": "t",
"kind": "timing",
"unit": "μs",
"min": null,
"typ": 80,
"max": null,
"conditions": "VOUT=3.3V, RL=68Ω, COUT=1μF",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Input Low Voltage (SHDN)",
"symbol": "VIL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.4,
"conditions": "VIN=1.8V to 5V",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Input High Voltage (SHDN)",
"symbol": "VIH",
"kind": "electrical",
"unit": "V",
"min": 1.2,
"typ": null,
"max": null,
"conditions": "VIN=1.8V to 5V",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Output Voltage Temperature Coefficient",
"symbol": "",
"kind": "temperature_coefficient",
"unit": "ppm/°C",
"min": null,
"typ": null,
"max": 60,
"conditions": "TC -40°C to +125°C",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Line Regulation",
"symbol": "",
"kind": "electrical",
"unit": "%/V",
"min": null,
"typ": null,
"max": 0.3,
"conditions": "VOUT+0.3V≤VIN≤5V or VIN>1.8V, IOUT=10mA",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Load Regulation",
"symbol": "",
"kind": "electrical",
"unit": "%",
"min": null,
"typ": null,
"max": 0.6,
"conditions": "VIN=VOUT+1V or VIN>1.8V, 1mA≤IOUT≤250mA",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Output Voltage Noise",
"symbol": "",
"kind": "electrical",
"unit": "μVRMS",
"min": null,
"typ": 115,
"max": null,
"conditions": "VOUT=3.0V, f=10Hz to 100kHz, CIN=1μF, IOUT=100mA",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Power Supply Ripple Rejection",
"symbol": "PSRR",
"kind": "electrical",
"unit": "dB",
"min": null,
"typ": 56,
"max": null,
"conditions": "VIN=VOUT+1V, IOUT=100mA, f=100Hz",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Power Supply Ripple Rejection",
"symbol": "PSRR",
"kind": "electrical",
"unit": "dB",
"min": null,
"typ": 42,
"max": null,
"conditions": "VIN=VOUT+1V, IOUT=100mA, f=1kHz",
"source_page": 6,
"source": "datasheet"
},
{
"name": "ESD Rating Human Body Mode",
"symbol": "",
"kind": "absolute_maximum",
"unit": "kV",
"min": null,
"typ": null,
"max": 2,
"conditions": "Human Body Mode",
"source_page": 6,
"source": "datasheet"
}
]
}
},
"variants": [],
"sections": [
"hero",
"viewers",
"readme",
"breadcrumbs",
"info"
],
"discovery_triggers": [
"um1540s-33"
],
"discovery_pitch": "UM1540S-33 (Union Semiconductor) 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",
"um1540s-33.kicad_sym",
"um1540s-33.kicad_mod",
"um1540s-33.glb",
"um1540s-33.step",
"um1540s-33.lbr",
"docs/hero.png",
"docs/um1540s-33-datasheet.pdf",
"viewers/symbol.html",
"viewers/footprint.html",
"um1540s-33-hero.glb",
"um1540s-33-hero.overlay.json",
"um1540s-33-etched.glb"
],
"visibility": {
"public": true
}
}