component
A3921KLPTR-T
Public Made by Adomby adom
Allegro MicroSystems LLC Brushed DC Motor Drivers, TSSOP-28-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "a3921klptr-t",
"title": "A3921KLPTR-T",
"brief": "Allegro MicroSystems LLC Brushed DC Motor Drivers, TSSOP-28-EP. 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",
"motor driver ics",
"a3921klptr-t",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "A3921KLPTR-T",
"manufacturer": "Allegro MicroSystems LLC",
"package": "TSSOP-28-EP",
"pin_count": 29,
"category": "Motor Driver ICs",
"subcategory": "Brushed DC Motor Drivers",
"datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588908650219900928",
"parts": {
"symbol": "a3921klptr-t.kicad_sym",
"footprint": "a3921klptr-t.kicad_mod",
"model_3d": "a3921klptr-t-hero.glb",
"model_3d_plain": "a3921klptr-t-etched.glb",
"model_3d_step": "a3921klptr-t-etched.step",
"model_3d_step_plain": "a3921klptr-t.step",
"lbr": "a3921klptr-t.lbr"
},
"distributor_links": {
"lcsc": "C459251",
"digikey": "620-1523-2-ND",
"mouser": "250-A3921KLPTR-T"
},
"distributor_check": {
"checked_at": "2026-10-19T03:49:33Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "620-1523-2-ND",
"status": "found",
"lifecycle": "Active"
},
"mouser": {
"pn": "250-A3921KLPTR-T",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "VDRAIN",
"type": "input",
"description": "High-side common drain sense input, to be connected directly to the common drain point of the power bridge FETs; its input current is about 72 × VDSTH + 52 µA (µA, with VDSTH in V)."
},
{
"number": "2",
"name": "LSS",
"type": "power_in",
"description": "Low-side common source return path for gate discharge, to be tied to the low-side FET sources through an independent low-impedance connection and not directly to GND."
},
{
"number": "3",
"name": "GLB",
"type": "output",
"description": "Low-side gate drive output B for the external N-channel low-side FET; sources current to turn on and sinks to LSS to turn off."
},
{
"number": "4",
"name": "SB",
"type": "passive",
"description": "Load connection B, sensing the voltage switched across the load and serving as the negative supply connection for the phase B high-side drive."
},
{
"number": "5",
"name": "GHB",
"type": "output",
"description": "High-side gate drive output B for the external N-channel high-side FET; sources current to turn on and sinks to SB to turn off."
},
{
"number": "6",
"name": "CB",
"type": "passive",
"description": "Bootstrap capacitor B high-side connection and positive supply for the phase B high-side gate drive."
},
{
"number": "7",
"name": "NC",
"type": "unconnected",
"description": "No connection."
},
{
"number": "8",
"name": "VREG",
"type": "power_out",
"description": "Regulated supply, nominally 13 V, that powers the low-side gate drivers and bootstrap charging and needs a storage capacitor (about 20 × CBOOT) close to the pin."
},
{
"number": "9",
"name": "CA",
"type": "passive",
"description": "Bootstrap capacitor A high-side connection and positive supply for the phase A high-side gate drive."
},
{
"number": "10",
"name": "GHA",
"type": "output",
"description": "High-side gate drive output A for the external N-channel high-side FET; sources current to turn on and sinks to SA to turn off."
},
{
"number": "11",
"name": "SA",
"type": "passive",
"description": "Load connection A, sensing the voltage switched across the load and serving as the negative supply connection for the phase A high-side drive."
},
{
"number": "12",
"name": "GLA",
"type": "output",
"description": "Low-side gate drive output A for the external N-channel low-side FET; sources current to turn on and sinks to LSS to turn off."
},
{
"number": "13",
"name": "VBB",
"type": "power_in",
"description": "Main load supply, specified for 7 to 50 V with functional operation down to 5.5 V, decoupled with a ceramic capacitor close to the VBB and GND pins."
},
{
"number": "14",
"name": "NC",
"type": "unconnected",
"description": "No connection."
},
{
"number": "15",
"name": "CP2",
"type": "passive",
"description": "Charge pump capacitor terminal 2; a pump capacitor of at least 220 nF (typically 470 nF) is connected between CP1 and CP2."
},
{
"number": "16",
"name": "CP1",
"type": "passive",
"description": "Charge pump capacitor terminal 1; a pump capacitor of at least 220 nF (typically 470 nF) is connected between CP1 and CP2."
},
{
"number": "17",
"name": "GND",
"type": "power_in",
"description": "Ground reference for the device; the sensitive RDEAD and VDSTH connections must be referenced directly to this pin."
},
{
"number": "18",
"name": "NC",
"type": "unconnected",
"description": "No connection."
},
{
"number": "19",
"name": "PHASE",
"type": "input",
"description": "Phase control input that sets the positive load current direction and doubles as a PWM input for fast-decay four-quadrant control."
},
{
"number": "20",
"name": "V5",
"type": "power_out",
"description": "Integrated 5 V logic supply regulator output (4.5 to 5.5 V at no load), used for external pullups and requiring at least 100 nF decoupling to GND."
},
{
"number": "21",
"name": "SR",
"type": "input",
"description": "Synchronous rectification enable input; high enables synchronous rectification during PWM off time, low disables it."
},
{
"number": "22",
"name": "PWML",
"type": "input",
"description": "Low-side PWM control input that chops the low-side FETs; PWML and PWMH can be tied together for fast-decay PWM."
},
{
"number": "23",
"name": "PWMH",
"type": "input",
"description": "High-side PWM control input that chops the high-side FETs; PWMH and PWML can be tied together for fast-decay PWM."
},
{
"number": "24",
"name": "RESET",
"type": "input",
"description": "Active-low reset input that puts the device into sleep mode when held low and clears latched faults on a pulse shorter than tRES (0.1 to 3.5 µs); it has a 50 kΩ internal pulldown."
},
{
"number": "25",
"name": "FF1",
"type": "output",
"description": "Open-drain Fault Flag 1 output, used with FF2 to signal fault conditions per Table 3 (VFF(L) at most 0.4 V at 1 mA when no fault is present)."
},
{
"number": "26",
"name": "FF2",
"type": "output",
"description": "Open-drain Fault Flag 2 output, used with FF1 to signal fault conditions per Table 3 (VFF(L) at most 0.4 V at 1 mA when no fault is present)."
},
{
"number": "27",
"name": "RDEAD",
"type": "passive",
"description": "Dead-time setting input; a resistor between RDEAD and GND from 3 kΩ to 240 kΩ sets tDEAD, and connecting it directly to V5 selects the default 6 µs typical dead time."
},
{
"number": "28",
"name": "VDSTH",
"type": "input",
"description": "VDS fault threshold input, with a valid range of 0.1 to 2 V; connecting it to V5 or above the 4.95 V disable threshold disables the FET short-circuit detection."
},
{
"number": "29",
"name": "PAD",
"type": "passive",
"description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
}
],
"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: Pin types for LSS, SB, SA, CA, CB, CP1, CP2, VDRAIN and RDEAD are not stated as ERC classes in the d; Exposed pad is listed in Table 4 as 'PAD' rather than a numbered pin; it is included as a separate e; The datasheet specifies the LP (TSSOP-28 with exposed pad) package for the A3921KLPTR-T, so this pin",
"exposed pad 29 added from the footprint",
"dropped thermal pad ['EP'] absent from footprint"
],
"pages_sent": 21,
"cost_usd": 0.138,
"at": "2026-10-19T03:48:00"
},
"datasheet": {
"url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588908650219900928",
"pages": 21,
"sha256": "32208e8ce1b5a970",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 29,
"described": 29,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "a3921klptr-t.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
7.2,
9.7,
1.05
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "ff242f1d3be9d09e7f929707a2c5b1ee974a4f882053b04bcdb1cd2cb21223ef",
"checked": "2026-10-19",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "a3921klptr-t-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
7.2,
9.7,
1.05
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "479f8de3490a86556c8452c4fc0b277d699465b37b8d70e9d5bd74f8f5b4ea9d",
"checked": "2026-10-19",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "Allegro MicroSystems LLC",
"Package": "TSSOP-28-EP",
"Category": "Motor Driver ICs",
"Pins": "29"
},
"appearance": {
"contacts": {
"quote": "an exposed thermal pad (suffix LP). This package is lead (Pb) free, with 100% matte-tin leadframe plating.",
"page": 1,
"doc": "ds.pdf",
"plating": "tin"
},
"version": 1,
"datasheet_sha256": "32208e8ce1b5a970c37f1a115f6eba52d40e87a0af94f6630435c0c626cf2e18"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "32208e8ce1b5a970c37f1a115f6eba52d40e87a0af94f6630435c0c626cf2e18",
"rows": [
{
"name": "Load Supply Voltage Functional Operating Range",
"symbol": "VBB",
"kind": "recommended_operating",
"unit": "V",
"min": 5.5,
"typ": null,
"max": 50,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Load Supply Quiescent Current",
"symbol": "IBBQ",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 10,
"max": 14,
"conditions": "RESET = high, outputs = low, VBB = 12 V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Load Supply Sleep Current",
"symbol": "IBBS",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": null,
"max": 10,
"conditions": "RESET = low, Sleep mode, VBB = 12 V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "VREG Output Voltage",
"symbol": "VREG",
"kind": "electrical",
"unit": "V",
"min": 12.5,
"typ": 13,
"max": 13.75,
"conditions": "VBB > 9 V, IREG = 0 to 10 mA",
"source_page": 5,
"source": "datasheet"
},
{
"name": "VREG Output Voltage",
"symbol": "VREG",
"kind": "electrical",
"unit": "V",
"min": 8.5,
"typ": 9.5,
"max": null,
"conditions": "5.5 V < VBB ≤ 6 V, IREG < 5.5 mA",
"source_page": 5,
"source": "datasheet"
},
{
"name": "V5 Output Voltage",
"symbol": "V5(out)",
"kind": "electrical",
"unit": "V",
"min": 4.5,
"typ": 5,
"max": 5.5,
"conditions": "No load",
"source_page": 5,
"source": "datasheet"
},
{
"name": "V5 Line Regulation",
"symbol": "V5(line)",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": 15,
"max": 40,
"conditions": "I5 = –2 mA",
"source_page": 5,
"source": "datasheet"
},
{
"name": "V5 Load Regulation",
"symbol": "V5(load)",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": 50,
"max": 100,
"conditions": "I5 = 0 to –2 mA",
"source_page": 5,
"source": "datasheet"
},
{
"name": "V5 Short-Circuit Current",
"symbol": "I5M",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 28,
"max": 35,
"conditions": "VBB = 40 V, V5 = 0 V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Bootstrap Diode Forward Voltage",
"symbol": "VfBOOT",
"kind": "electrical",
"unit": "V",
"min": 0.4,
"typ": 0.7,
"max": 1,
"conditions": "ID = 10 mA",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Bootstrap Diode Forward Voltage",
"symbol": "VfBOOT",
"kind": "electrical",
"unit": "V",
"min": 1.5,
"typ": 2.2,
"max": 2.8,
"conditions": "ID = 100 mA",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Bootstrap Diode Resistance",
"symbol": "rD",
"kind": "electrical",
"unit": "Ω",
"min": 6,
"typ": 10,
"max": 20,
"conditions": "rD(100mA) = (VfBOOT(150mA) – VfBOOT(50mA)) / 100 mA",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Bootstrap Diode Current Limit",
"symbol": "IDBOOT",
"kind": "electrical",
"unit": "mA",
"min": 250,
"typ": 500,
"max": 750,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "High-Side Gate Drive Static Load Resistance",
"symbol": "RGSH",
"kind": "electrical",
"unit": "kΩ",
"min": 250,
"typ": null,
"max": null,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Pullup On Resistance",
"symbol": "RDS(on)UP",
"kind": "electrical",
"unit": "Ω",
"min": 6,
"typ": 8,
"max": 12,
"conditions": "TJ = 25°C, IGHx = –150 mA",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Pullup On Resistance",
"symbol": "RDS(on)UP",
"kind": "electrical",
"unit": "Ω",
"min": 10,
"typ": 13,
"max": 16,
"conditions": "TJ = 150°C, IGHx = –150 mA",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Pulldown On Resistance",
"symbol": "RDS(on)DN",
"kind": "electrical",
"unit": "Ω",
"min": 2,
"typ": 3,
"max": 4,
"conditions": "TJ = 25°C, IGLx = 150 mA",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Pulldown On Resistance",
"symbol": "RDS(on)DN",
"kind": "electrical",
"unit": "Ω",
"min": 3,
"typ": 4.5,
"max": 6,
"conditions": "TJ = 150°C, IGLx = 150 mA",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Turn-Off Propagation Delay",
"symbol": "tP(off)",
"kind": "timing",
"unit": "ns",
"min": 60,
"typ": 90,
"max": 150,
"conditions": "Input change to unloaded gate output change",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Turn-On Propagation Delay",
"symbol": "tP(on)",
"kind": "timing",
"unit": "ns",
"min": 60,
"typ": 90,
"max": 150,
"conditions": "Input change to unloaded gate output change",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Dead Time",
"symbol": "tDEAD",
"kind": "timing",
"unit": "ns",
"min": 815,
"typ": 960,
"max": 1110,
"conditions": "RDEAD = 30 kΩ",
"source_page": 6,
"source": "datasheet"
},
{
"name": "FF1 and FF2 Fault Output Low Voltage",
"symbol": "VFF(L)",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.4,
"conditions": "IFF = 1 mA, fault not present",
"source_page": 6,
"source": "datasheet"
},
{
"name": "FF1 and FF2 Fault Output Leakage Current",
"symbol": "IFF(H)",
"kind": "electrical",
"unit": "µA",
"min": -1,
"typ": null,
"max": 1,
"conditions": "VFF = 5 V, fault present",
"source_page": 6,
"source": "datasheet"
},
{
"name": "RDEAD Current",
"symbol": "IDEAD",
"kind": "electrical",
"unit": "µA",
"min": -200,
"typ": null,
"max": -70,
"conditions": "RDEAD = GND",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Input Low Voltage",
"symbol": "VIN(L)",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.8,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Input High Voltage",
"symbol": "VIN(H)",
"kind": "electrical",
"unit": "V",
"min": 2,
"typ": null,
"max": null,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Input Hysteresis (Except RESET Pin)",
"symbol": "VINhys",
"kind": "electrical",
"unit": "mV",
"min": 100,
"typ": 250,
"max": null,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Input Hysteresis (RESET Pin)",
"symbol": "VINRSThys",
"kind": "electrical",
"unit": "mV",
"min": 200,
"typ": null,
"max": null,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Input Current (Except RESET Pin)",
"symbol": "IIN",
"kind": "electrical",
"unit": "µA",
"min": -1,
"typ": null,
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