component
A3979SLPTR-T
Public Made by Adomby adom
Allegro MicroSystems, LLC Motor Driver ICs, HTSSOP-28. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "a3979slptr-t",
"title": "A3979SLPTR-T",
"brief": "Allegro MicroSystems, LLC Motor Driver ICs, HTSSOP-28. 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 ics",
"a3979slptr-t",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "A3979SLPTR-T",
"manufacturer": "Allegro MicroSystems, LLC",
"package": "HTSSOP-28",
"pin_count": 29,
"category": "Power Management ICs",
"subcategory": "Motor Driver ICs",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/3ea0f925983a4df8835c70649fa2881f.pdf",
"parts": {
"symbol": "a3979slptr-t.kicad_sym",
"footprint": "a3979slptr-t.kicad_mod",
"model_3d": "a3979slptr-t-hero.glb",
"model_3d_plain": "a3979slptr-t-etched.glb",
"model_3d_step": "a3979slptr-t-etched.step",
"model_3d_step_plain": "a3979slptr-t.step",
"lbr": "a3979slptr-t.lbr"
},
"distributor_links": {
"lcsc": "C34468"
},
"distributor_check": {
"checked_at": "2026-10-22T21:46:58Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "quota"
},
"mouser": {
"pn": null,
"status": "quota"
}
},
"pins": [
{
"number": "1",
"name": "SENSE1",
"type": "passive",
"description": "Sense resistor connection for Bridge 1; voltage on this pin must not exceed the 0.5 V maximum rating."
},
{
"number": "2",
"name": "HOME",
"type": "output",
"description": "Logic output indicating the translator is at its initial Home state; goes low on RESET (VHOME(1) ≥ 0.7×VDD at -200 µA, VHOME(0) ≤ 0.3×VDD at 200 µA)."
},
{
"number": "3",
"name": "DIR",
"type": "input",
"description": "Logic input setting the motor rotation direction; changes take effect on the next rising edge of STEP."
},
{
"number": "4",
"name": "OUT1A",
"type": "output",
"description": "DMOS full-bridge output A for Bridge 1, rated up to 35 V and ±2.5 A."
},
{
"number": "5",
"name": "PFD",
"type": "input",
"description": "Percent fast decay input: above 0.6×VDD selects Slow decay, below 0.21×VDD selects Fast decay, in between selects Mixed decay; decouple with 0.1 µF."
},
{
"number": "6",
"name": "RC1",
"type": "passive",
"description": "Analog RT/CT timing connection to ground setting the fixed off-time (tOFF = RT×CT) and blanking time (tBLANK = 1400×CT) for Bridge 1."
},
{
"number": "7",
"name": "AGND",
"type": "power_in",
"description": "Analog ground; must be connected externally to PGND."
},
{
"number": "8",
"name": "REF",
"type": "input",
"description": "Current trip reference voltage input (0 to VDD); ITRIPmax = VREF/8RS, and VREF should not exceed 4 V in other than full-step modes."
},
{
"number": "9",
"name": "RC2",
"type": "passive",
"description": "Analog RT/CT timing connection to ground setting the fixed off-time (tOFF = RT×CT) and blanking time (tBLANK = 1400×CT) for Bridge 2."
},
{
"number": "10",
"name": "VDD",
"type": "power_in",
"description": "Logic supply, 3.0 to 5.5 V operating range (7.0 V absolute maximum)."
},
{
"number": "11",
"name": "OUT2A",
"type": "output",
"description": "DMOS full-bridge output A for Bridge 2, rated up to 35 V and ±2.5 A."
},
{
"number": "12",
"name": "MS2",
"type": "input",
"description": "Logic input that together with MS1 selects the microstep resolution (full, half, quarter, sixteenth); changes take effect on the next rising STEP edge."
},
{
"number": "13",
"name": "MS1",
"type": "input",
"description": "Logic input that together with MS2 selects the microstep resolution (full, half, quarter, sixteenth); changes take effect on the next rising STEP edge."
},
{
"number": "14",
"name": "SENSE2",
"type": "passive",
"description": "Sense resistor connection for Bridge 2; voltage on this pin must not exceed the 0.5 V maximum rating."
},
{
"number": "15",
"name": "VBB2",
"type": "power_in",
"description": "Load supply for Bridge 2, 8 to 35 V operating; decouple with an electrolytic capacitor (>47 µF recommended) close to the device."
},
{
"number": "16",
"name": "SR",
"type": "input",
"description": "Logic input selecting synchronous rectification: low enables Active mode, high disables it."
},
{
"number": "17",
"name": "RESET",
"type": "input",
"description": "Active-low logic input that sets the translator to the Home state and turns off all DMOS outputs; STEP inputs are ignored until it is high."
},
{
"number": "18",
"name": "OUT2B",
"type": "output",
"description": "DMOS full-bridge output B for Bridge 2, rated up to 35 V and ±2.5 A."
},
{
"number": "19",
"name": "STEP",
"type": "input",
"description": "Logic input where a low-to-high transition advances the motor one microstep (minimum pulse width 1 µs)."
},
{
"number": "20",
"name": "VREG",
"type": "passive",
"description": "Internally generated regulator voltage for the sink-side DMOS outputs; must be decoupled with a 0.22 µF capacitor to ground."
},
{
"number": "21",
"name": "PGND",
"type": "power_in",
"description": "Power ground; must be connected externally to AGND."
},
{
"number": "22",
"name": "VCP",
"type": "passive",
"description": "Charge pump reservoir capacitor connection; a 0.22 µF ceramic capacitor is required between VCP and VBB."
},
{
"number": "23",
"name": "CP1",
"type": "passive",
"description": "Charge pump capacitor terminal 1; connect a 0.22 µF ceramic capacitor between CP1 and CP2."
},
{
"number": "24",
"name": "CP2",
"type": "passive",
"description": "Charge pump capacitor terminal 2; connect a 0.22 µF ceramic capacitor between CP1 and CP2."
},
{
"number": "25",
"name": "OUT1B",
"type": "output",
"description": "DMOS full-bridge output B for Bridge 1, rated up to 35 V and ±2.5 A."
},
{
"number": "26",
"name": "ENABLE",
"type": "input",
"description": "Active-low logic input that enables the DMOS outputs; logic high disables the outputs while translator inputs remain active."
},
{
"number": "27",
"name": "SLEEP",
"type": "input",
"description": "Active-low logic input for sleep mode to minimize power consumption; allow 1 ms after wake-up before issuing STEP."
},
{
"number": "28",
"name": "VBB1",
"type": "power_in",
"description": "Load supply for Bridge 1, 8 to 35 V operating; decouple with an electrolytic capacitor (>47 µF recommended) close to the device."
},
{
"number": "29",
"name": "EP",
"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-sonnet-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 shown as required in the block diagram (grounded, with AGND/PGND connecte; The terminal list prints pin 25 as '1OUT1B', which looks like a typo. The pin-out diagram and block ; The datasheet gives no electrical type for the pins. Types for the sense, RC, VREG, VCP and CP pins ",
"2/29 pins cited to the wrong page (name found elsewhere): ['17:RESET@p13', '27:SLEEP@p13']"
],
"pages_sent": 15,
"cost_usd": 0.1689,
"at": "2026-10-22T21:46:49"
},
"datasheet": {
"url": "https://datasheet.lcsc.com/datasheet/pdf/3ea0f925983a4df8835c70649fa2881f.pdf",
"pages": 15,
"sha256": "914c40550526a032",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 29,
"described": 29,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
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},
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"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
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"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "ff242f1d3be9d09e7f929707a2c5b1ee974a4f882053b04bcdb1cd2cb21223ef",
"checked": "2026-10-22",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "a3979slptr-t-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
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"sha256": "289b1fef1ccb6b2e183c25a260977b28a51e0864d233894daa7799d27066170d",
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}
]
},
"metadata": {
"specs": {
"Manufacturer": "Allegro MicroSystems, LLC",
"Package": "HTSSOP-28",
"Category": "Power Management ICs",
"Pins": "29"
},
"appearance": {
"contacts": {
"quote": "28-pin TSSOP with exposed thermal pad. The package is lead (Pb) free, with 100% matte tin leadframe plating.",
"page": 1,
"doc": "ds.pdf",
"plating": "tin"
},
"version": 1,
"datasheet_sha256": "914c40550526a0321c39b4519069cd7a0b2a63fc64acfe459afee12c8c4dcffe"
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"characteristics": {
"version": 1,
"source": "datasheet",
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"rows": [
{
"name": "Load Supply Voltage Range, operating",
"symbol": "VBB",
"kind": "electrical",
"unit": "V",
"min": 8,
"typ": null,
"max": 35,
"conditions": "Operating",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Load Supply Voltage Range, sleep",
"symbol": "VBB",
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"min": 0,
"typ": null,
"max": 35,
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},
{
"name": "Output Leakage Current high",
"symbol": "IDSS",
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"unit": "μA",
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"max": 20,
"conditions": "VOUT = VBB",
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"source": "datasheet"
},
{
"name": "Output Leakage Current low",
"symbol": "IDSS",
"kind": "electrical",
"unit": "μA",
"min": -20,
"typ": 1,
"max": null,
"conditions": "VOUT = 0 V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Source driver On Resistance",
"symbol": "RDS(On)",
"kind": "electrical",
"unit": "Ω",
"min": null,
"typ": 0.28,
"max": 0.335,
"conditions": "Source driver, IOUT = –2.5 A",
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{
"name": "Sink driver On Resistance",
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"max": 0.265,
"conditions": "Sink driver, IOUT = 2.5 A",
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{
"name": "Source Diode Forward Voltage",
"symbol": "VF",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 1.4,
"conditions": "Source diode, IF = –2.5 A",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Sink Diode Forward Voltage",
"symbol": "VF",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 1.4,
"conditions": "Sink diode, IF = 2.5 A",
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"source": "datasheet"
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{
"name": "Motor Supply Current",
"symbol": "IBB",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": null,
"max": 8,
"conditions": "fPWM < 50 kHz",
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{
"name": "Motor Supply Current, outputs disabled",
"symbol": "IBB",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": null,
"max": 6,
"conditions": "Operating, outputs disabled",
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"source": "datasheet"
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{
"name": "Motor Supply Current, sleep",
"symbol": "IBB",
"kind": "electrical",
"unit": "μA",
"min": null,
"typ": null,
"max": 20,
"conditions": "Sleep mode",
"source_page": 4,
"source": "datasheet"
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{
"name": "Logic Supply Voltage Range",
"symbol": "VDD",
"kind": "electrical",
"unit": "V",
"min": 3,
"typ": 5,
"max": 5.5,
"conditions": "Operating",
"source_page": 4,
"source": "datasheet"
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{
"name": "Logic Supply Current",
"symbol": "IDD",
"kind": "electrical",
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"typ": null,
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"conditions": "fPWM < 50 kHz",
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{
"name": "Logic Supply Current, outputs off",
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"typ": null,
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"conditions": "Outputs off",
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"name": "Logic Supply Current, sleep",
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"typ": null,
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"conditions": "Sleep mode",
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{
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{
"name": "Logic Input Voltage low",
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{
"name": "Logic Input Current high",
"symbol": "IIN(1)",
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"unit": "μA",
"min": -20,
"typ": 1,
"max": 20,
"conditions": "VIN = 0.7 × VDD",
"source_page": 4,
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{
"name": "Logic Input Current low",
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"unit": "μA",
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"conditions": "VIN = 0.3 × VDD",
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{
"name": "Reference Input Voltage Range",
"symbol": "VREF",
"kind": "electrical",
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"min": 0,
"typ": null,
"max": 5.5,
"conditions": "Operating (0 to VDD)",
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{
"name": "Reference Input Current",
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{
"name": "HOME Output Voltage high",
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"conditions": "IHOME(1) = –200 μA",
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{
"name": "HOME Output Voltage low",
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"conditions": "IHOME(0) = 200 μA",
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{
"name": "Mixed Decay Trip Point high",
"symbol": "VPFDH",
"kind": "electrical",
"unit": "xVDD",
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{
"name": "Mixed Decay Trip Point low",
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"unit": "xVDD",
"min": null,
"typ": 0.21,
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{
"name": "Gain Error at 38.27% phase current",
"symbol": "EG",
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"unit": "%",
"min": -10,
"typ": null,
"max": 10,
"conditions": "VREF = 2 V, Phase Current = 38.27%",
"source_page": 4,
"source": "datasheet"
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{
"name": "Gain Error at 70.71% phase current",
"symbol": "EG",
"kind": "electrical",
"unit": "%",
"min": -5,
"typ": null,
"max": 5,
"conditions": "VREF = 2 V, Phase Current = 70.71%",
"source_page": 4,
"source": "datasheet"
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{
"name": "Gain Error at 100% phase current",
"symbol": "EG",
"kind": "electrical",
"unit": "%",
"min": -5,
"typ": null,
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"conditions": "VREF = 2 V, Phase Current = 100.00%",
"source_page": 4,
"source": "datasheet"
},
{
"name": "STEP Pulse Width",
"symbol": "tW",
"kind": "timing",
"unit": "μs",
"min": 1,
"typ": null,
"max": null,
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},
{
"name": "Blank Time",
"symbol": "tBLANK",
"kind": "timing",
"unit": "ns",
"min": 700,
"typ": 950,
"max": 1200,
"conditions": "RT = 56 kΩ, CT = 680 pF",
"source_page": 4,
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},
{
"name": "Fixed Off-Time",
"symbol": "tOFF",
"kind": "timing",
"unit": "μs",
"min": 30,
"typ": 38,
"max": 46,
"conditions": "RT = 56 kΩ, CT = 680 pF",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Crossover Dead Time",
"symbol": "tDT",
"kind": "timing",
"unit": "ns",
"min": 100,
"typ": 475,
"max": 800,
"conditions": "Synchronous rectification enabled",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Thermal Shutdown Temperature",
"symbol": "TJSD",
"kind": "electrical",
"unit": "°C",
"min": null,
"typ": 165,
"max": null,
"conditions": "",
"source_page": 5,
"source": "datasheet"
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