component
MCP2021A-500E
Public Made by Adomby adom
Microchip Tech LIN Transceivers, DFN-8-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"component": {
"mpn": "MCP2021A-500E",
"manufacturer": "Microchip Tech",
"package": "DFN-8-EP(4x4)",
"pin_count": 9,
"category": "Communication Interface Chip/UART/485/232",
"subcategory": "LIN Transceivers",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/27d9c2703e9054c7ae306c444658a6e9.pdf",
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"lbr": "mcp2021a-500e.lbr"
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"distributor_links": {
"lcsc": "C637684"
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"distributor_check": {
"checked_at": "2026-10-30T15:37:20Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "no match"
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},
"pins": [
{
"number": "1",
"name": "RXD",
"type": "output",
"description": "Receive Data Output is a standard CMOS output that follows the state of the LBUS pin."
},
{
"number": "2",
"name": "CS/LWAKE",
"type": "input",
"description": "Chip Select and Local Wake-up Input is a TTL-level, high-voltage-tolerant input that controls device state transitions and should not be tied directly to VREG."
},
{
"number": "3",
"name": "VREG",
"type": "power_out",
"description": "Positive supply voltage regulator output provides +5.0 V or +3.3 V at 70 mA regulated voltage."
},
{
"number": "4",
"name": "TXD",
"type": "input",
"description": "Transmit Data Input is a TTL-level, HV-compliant input with adaptive pull-up (about 4.2 V internal) that drives LBUS low when TXD is low and is HV-compliant up to 30 V."
},
{
"number": "5",
"name": "VSS",
"type": "power_in",
"description": "Ground pin."
},
{
"number": "6",
"name": "LBUS",
"type": "bidirectional",
"description": "LIN Bus pin is a bidirectional, HV open-collector output with current limitation, controlled by TXD, with controlled edge slopes to reduce emission."
},
{
"number": "7",
"name": "VBB",
"type": "power_in",
"description": "Battery Positive Supply Voltage pin, which requires an external series diode to prevent reverse powering of the device."
},
{
"number": "8",
"name": "FAULT/TXE",
"type": "bidirectional",
"description": "Fault Detect Output/Transmitter Enable Input is an HV-tolerant open-drain output (up to 30 V) that places the device in Transmitter Off mode when driven low, and a 10 kΩ external pull-up is recommended."
},
{
"number": "9",
"name": "EP",
"type": "passive",
"description": "Exposed Thermal Pad, listed for the 4x4 DFN package in the pin function table; the datasheet gives no electrical function for it."
}
],
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"extractor": "extract_pins 0.3",
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"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: Table 1-2 lists the exposed thermal pad (EP) with no pin type, and the datasheet does not state whet; The datasheet labels VREG as 'Output' and describes it as a regulator output. The KiCad class power_"
],
"pages_sent": 20,
"cost_usd": 0.0571,
"at": "2026-10-30T15:36:31"
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"pages": 48,
"sha256": "3c5e8b3bb6f80ae5",
"source_tier": "mfr"
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"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
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"described": 9,
"cites_pages": true,
"refuses_to_fabricate": true
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