component
A3944KLPTR-T
Public Made by Adomby adom
Allegro MicroSystems, LLC Motor Driver ICs, TSSOP-28-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"slug": "a3944klptr-t",
"title": "A3944KLPTR-T",
"brief": "Allegro MicroSystems, LLC Motor Driver ICs, 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",
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"mpn": "A3944KLPTR-T",
"manufacturer": "Allegro MicroSystems, LLC",
"package": "TSSOP-28-EP",
"pin_count": 29,
"category": "Power Management ICs",
"subcategory": "Motor Driver ICs",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/df9f52f5850d092127a54c32326cdc14.pdf",
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"digikey": "620-1669-2-ND",
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"pins": [
{
"number": "1",
"name": "VDR",
"type": "power_in",
"description": "Positive gate drive supply for the GATx outputs, with an absolute maximum rating of -0.3 to 6.5 V."
},
{
"number": "2",
"name": "GAT0",
"type": "output",
"description": "Gate drive 0 output, driven between GND and VDR and connected directly or through a resistor to the external MOSFET gate."
},
{
"number": "3",
"name": "DRN0",
"type": "input",
"description": "Gate drive 0 drain sense analog high-voltage input, rated to 50 V, used to monitor the FET drain for short-to-battery, short-to-ground and open-load faults."
},
{
"number": "4",
"name": "GAT1",
"type": "output",
"description": "Gate drive 1 output, driven between GND and VDR and connected directly or through a resistor to the external MOSFET gate."
},
{
"number": "5",
"name": "DRN1",
"type": "input",
"description": "Gate drive 1 drain sense analog high-voltage input, rated to 50 V, used to monitor the FET drain for short-to-battery, short-to-ground and open-load faults."
},
{
"number": "6",
"name": "GAT2",
"type": "output",
"description": "Gate drive 2 output, driven between GND and VDR and connected directly or through a resistor to the external MOSFET gate."
},
{
"number": "7",
"name": "DRN2",
"type": "input",
"description": "Gate drive 2 drain sense analog high-voltage input, rated to 50 V, used to monitor the FET drain for short-to-battery, short-to-ground and open-load faults."
},
{
"number": "8",
"name": "GAT3",
"type": "output",
"description": "Gate drive 3 output, driven between GND and VDR and connected directly or through a resistor to the external MOSFET gate."
},
{
"number": "9",
"name": "DRN3",
"type": "input",
"description": "Gate drive 3 drain sense analog high-voltage input, rated to 50 V, used to monitor the FET drain for short-to-battery, short-to-ground and open-load faults."
},
{
"number": "10",
"name": "GAT4",
"type": "output",
"description": "Gate drive 4 output, driven between GND and VDR and connected directly or through a resistor to the external MOSFET gate."
},
{
"number": "11",
"name": "DRN4",
"type": "input",
"description": "Gate drive 4 drain sense analog high-voltage input, rated to 50 V, used to monitor the FET drain for short-to-battery, short-to-ground and open-load faults."
},
{
"number": "12",
"name": "GAT5",
"type": "output",
"description": "Gate drive 5 output, driven between GND and VDR and connected directly or through a resistor to the external MOSFET gate."
},
{
"number": "13",
"name": "DRN5",
"type": "input",
"description": "Gate drive 5 drain sense analog high-voltage input, rated to 50 V, used to monitor the FET drain for short-to-battery, short-to-ground and open-load faults."
},
{
"number": "14",
"name": "VREG",
"type": "power_out",
"description": "Regulated voltage output for analog and reference functions, with an absolute maximum rating of -0.3 to 20 V."
},
{
"number": "15",
"name": "VBB",
"type": "power_in",
"description": "Analog battery supply for the voltage regulator, which can connect to battery through reverse polarity protection, with an absolute maximum rating of -0.3 to 40 V."
},
{
"number": "16",
"name": "GND",
"type": "power_in",
"description": "Power ground return that connects to the common return point for all external MOSFET source connections."
},
{
"number": "17",
"name": "IN5",
"type": "input",
"description": "Gate drive 5 active-high control input with internal pull-down to GND, rated -0.3 to 6.5 V."
},
{
"number": "18",
"name": "IN4",
"type": "input",
"description": "Gate drive 4 active-high control input with internal pull-down to GND, rated -0.3 to 6.5 V."
},
{
"number": "19",
"name": "IN3",
"type": "input",
"description": "Gate drive 3 active-high control input with internal pull-down to GND, rated -0.3 to 6.5 V."
},
{
"number": "20",
"name": "IN2",
"type": "input",
"description": "Gate drive 2 active-high control input with internal pull-down to GND, rated -0.3 to 6.5 V."
},
{
"number": "21",
"name": "IN1",
"type": "input",
"description": "Gate drive 1 active-high control input with internal pull-down to GND, rated -0.3 to 6.5 V."
},
{
"number": "22",
"name": "IN0",
"type": "input",
"description": "Gate drive 0 active-high control input with internal pull-down to GND, rated -0.3 to 6.5 V."
},
{
"number": "23",
"name": "CSN",
"type": "input",
"description": "Active-low serial interface chip select with pull-up resistor; data is latched into the serial register when CSN goes high, rated -0.3 to 6.5 V."
},
{
"number": "24",
"name": "SI",
"type": "input",
"description": "Active-high serial data input with pull-down resistor, clocked into the serial register on the rising edge of SCK, rated -0.3 to 6.5 V."
},
{
"number": "25",
"name": "SCK",
"type": "input",
"description": "Serial interface clock input with pull-down resistor, rated -0.3 to 6.5 V."
},
{
"number": "26",
"name": "SO",
"type": "output",
"description": "Push-pull serial data output that carries fault register data on the falling edge of SCK and goes high impedance when CSN is high, rated -0.3 to 6.5 V."
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{
"number": "27",
"name": "RESETN",
"type": "input",
"description": "Active-low chip reset input that forces outputs low, resets the configuration and clears channel faults when held low longer than the minimum reset pulse width, rated -0.3 to 6.5 V."
},
{
"number": "28",
"name": "VDD",
"type": "power_in",
"description": "Positive logic supply for digital inputs, outputs and logic, with an absolute maximum rating of -0.3 to 6.5 V."
},
{
"number": "29",
"name": "PAD",
"type": "passive",
"description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
}
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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: The exposed thermal pad is listed in the terminal table as PAD with no numeric pin number, so it is "
],
"pages_sent": 7,
"cost_usd": 0.0247,
"at": "2026-10-28T15:48:35"
},
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"sha256": "01679bb65c0b7218",
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"described": 29,
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"metadata": {
"specs": {
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"Package": "TSSOP-28-EP",
"Category": "Power Management ICs",
"Pins": "29"
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"appearance": {
"contacts": {
"quote": "LP) with an exposed thermal pad. The package is lead (Pb) free with 100% matte-tin leadframe plating.",
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"doc": "ds.pdf",
"plating": "tin"
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{
"name": "Analog Supply Voltage",
"symbol": "VBB",
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"min": -0.3,
"typ": null,
"max": 40,
"conditions": "with respect to ground at TA = 25°C",
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