component
ADM1281-1ACPZ
Public Made by Adomby adom
Analog Devices , LFCSP-32(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "adm1281-1acpz",
"title": "ADM1281-1ACPZ",
"brief": "Analog Devices , LFCSP-32(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
"tags": [
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"ic",
"adm1281-1acpz",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "ADM1281-1ACPZ",
"manufacturer": "Analog Devices",
"package": "LFCSP-32(5x5)",
"pin_count": 33,
"category": "IC",
"subcategory": "IC",
"datasheet": "https://www.analog.com/media/en/technical-documentation/data-sheets/adm1281.pdf",
"parts": {
"symbol": "adm1281-1acpz.kicad_sym",
"footprint": "adm1281-1acpz.kicad_mod",
"model_3d": "adm1281-1acpz-hero.glb",
"model_3d_plain": "adm1281-1acpz-etched.glb",
"model_3d_step": "adm1281-1acpz-etched.step",
"model_3d_step_plain": "adm1281-1acpz.step",
"lbr": "adm1281-1acpz.lbr"
},
"distributor_links": {
"lcsc": "C33737397",
"digikey": "505-ADM1281-1ACPZ-ND",
"mouser": "584-ADM1281-1ACPZ"
},
"distributor_check": {
"checked_at": "2026-11-04T12:51:54Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "505-ADM1281-1ACPZ-ND",
"status": "found"
},
"mouser": {
"pn": "584-ADM1281-1ACPZ",
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}
},
"pins": [
{
"number": "1",
"name": "PSET",
"type": "input",
"description": "Programs the constant power limit, with FET power limited to (VPSET × 8)/(50 × RSENSE), and it can be set by a resistor divider from VCAP or an external reference."
},
{
"number": "2",
"name": "VCAP",
"type": "power_out",
"description": "Internal regulated supply that requires a capacitor of 1 µF or greater for accuracy and can be used as the reference for the ISET pin, regulated at 2.68 V to 2.72 V."
},
{
"number": "3",
"name": "ISET",
"type": "input",
"description": "Programs the current-limit threshold, with the default limit set by connecting it directly to VCAP and a recommended operating range of 0.25 V to 1.25 V for 5 mV to 25 mV VSENSE current limits."
},
{
"number": "4",
"name": "ISTART",
"type": "input",
"description": "Sets the start-up current limit for dv/dt power-up, active only while PWRGD is low, with an active range of 0.1 V to 1.25 V and tied to VCAP to disable the start-up limit."
},
{
"number": "5",
"name": "TIMER",
"type": "passive",
"description": "An external capacitor sets the initial power-on delay and overcurrent fault delay, and GATE is pulled low when TIMER exceeds its 1.0 V high threshold."
},
{
"number": "6",
"name": "FAULT",
"type": "output",
"description": "Open-drain output that asserts low and latches after an overcurrent fault, overtemperature fault, or FET health fault, with a low output of 0.4 V at 1 mA."
},
{
"number": "7",
"name": "ADR1",
"type": "input",
"description": "PMBus address select pin that can be connected to GND, connected to VCAP, left floating, or connected low through a 150 kΩ resistor, which together with ADR2 selects one of 16 addresses."
},
{
"number": "8",
"name": "ADR2",
"type": "input",
"description": "PMBus address select pin that can be connected to GND, connected to VCAP, left floating, or connected low through a 150 kΩ resistor, which together with ADR1 selects one of 16 addresses."
},
{
"number": "9",
"name": "DNC",
"type": "unconnected",
"description": "Do not connect."
},
{
"number": "10",
"name": "DNC",
"type": "unconnected",
"description": "Do not connect."
},
{
"number": "11",
"name": "DNC",
"type": "unconnected",
"description": "Do not connect."
},
{
"number": "12",
"name": "ENABLE",
"type": "input",
"description": "On the ADM1281-1 this active-high input must be high to allow a power-up sequence, with VIH of 1.1 V minimum, VIL of 0.8 V maximum, and a 1 µs glitch filter."
},
{
"number": "13",
"name": "GPO1/ALERT1/CONV",
"type": "bidirectional",
"description": "Configurable as a general-purpose digital output, an open-drain alert output that is the default at power-up, or a CONV input that controls when a power monitor ADC sampling cycle begins."
},
{
"number": "14",
"name": "GPO2/ALERT2",
"type": "output",
"description": "Configurable as a general-purpose digital output or an open-drain alert output that is the default at power-up, with a low output of 0.4 V at 1 mA."
},
{
"number": "15",
"name": "SDA",
"type": "bidirectional",
"description": "Open-drain serial data input/output that requires an external pull-up resistor, with VIH of 1.1 V minimum and VIL of 0.8 V maximum, and should be tied to GND or a pull-up if unused."
},
{
"number": "16",
"name": "SCL",
"type": "input",
"description": "Open-drain serial clock input that requires an external pull-up resistor, and should be tied to GND or a pull-up to VCAP or another supply if unused."
},
{
"number": "17",
"name": "RETRY",
"type": "input",
"description": "Has an internal 8 µA pull-up that enables the default latch-off mode after an overcurrent fault, and pulling it low enables a 10 second automatic retry."
},
{
"number": "18",
"name": "PWRGD",
"type": "output",
"description": "Open-drain power-good output that indicates the supply is within tolerance, no faults are detected, and the gate is fully enhanced, with a valid output guaranteed at VCC of 1 V."
},
{
"number": "19",
"name": "CSOUT",
"type": "output",
"description": "Outputs the VSENSE_HS voltage amplified by a gain of 350 V/V to represent load current, with total output error of ±1.6% at VSENSE_HS = 20 mV."
},
{
"number": "20",
"name": "VOUT",
"type": "input",
"description": "Input used to read back the output voltage through the internal ADC via a 1 kΩ series resistor from the FET source, and also used with HS− to calculate FET drain-to-source voltage for constant power foldback."
},
{
"number": "21",
"name": "PWGIN",
"type": "input",
"description": "Sets the power-good threshold with a 1.0 V falling threshold and 60 mV typical hysteresis, using a resistor divider from the FET source (VOUT), and PWRGD is not asserted until the output is above this threshold."
},
{
"number": "22",
"name": "GND",
"type": "power_in",
"description": "Ground connection for all sensitive analog nodes that should be isolated in a ground island and connected to the main ground plane at a single point as close to the pin as possible."
},
{
"number": "23",
"name": "PGND",
"type": "power_in",
"description": "Return path for the strong gate pull-down current and for the external transistor used for temperature measurement."
},
{
"number": "24",
"name": "GATE",
"type": "output",
"description": "High-side gate drive for an external N-channel FET, driven by a charge pump to regulate maximum load current, clamped to ≤31 V, and held low when VCC is below UVLO."
},
{
"number": "25",
"name": "TEMP",
"type": "passive",
"description": "Connects to an external NPN transistor placed near the MOSFETs for remote temperature sensing, with the voltage measured by the internal ADC and an operating range of −55 °C to +150 °C limited by the external diode."
},
{
"number": "26",
"name": "MO−",
"type": "input",
"description": "Negative power monitor input where a sense resistor between MO+ and MO− sets the sense voltage for load current measurement, with the power monitor amplifier input range of ±25 mV."
},
{
"number": "27",
"name": "HS−",
"type": "input",
"description": "Negative current sense input where a sense resistor between HS+ and HS− sets the analog current limit, and the hot-swap loop maintains VHS+ − VHS− at that sense voltage."
},
{
"number": "28",
"name": "HS+",
"type": "input",
"description": "Positive current sense input connected to the main supply, which together with HS− sets the analog current limit and is also used by the ADC to measure input voltage, with specifications given for VHS+ from 4 V to 20 V."
},
{
"number": "29",
"name": "MO+",
"type": "input",
"description": "Positive power monitor input where a sense resistor between MO+ and MO− sets the sense voltage used by the ADC to measure load current, with the power monitor amplifier input range of ±25 mV."
},
{
"number": "30",
"name": "VCC",
"type": "power_in",
"description": "Positive supply input with an operating voltage range of 4.5 V to 20 V and UVLO of 2.4 V to 2.7 V, recommended to be greater than or equal to HS+ and MO+ during normal operation."
},
{
"number": "31",
"name": "UV",
"type": "input",
"description": "Undervoltage input set by an external resistor divider, with a 1.0 V falling threshold, 60 mV typical hysteresis, and an absolute maximum rating of −0.3 V to +4 V."
},
{
"number": "32",
"name": "OV",
"type": "input",
"description": "Overvoltage input set by an external resistor divider, with a 1.0 V rising threshold, 60 mV typical hysteresis, and an absolute maximum rating of −0.3 V to +4 V."
},
{
"number": "33",
"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-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 assignments are taken from Table 8 (ADM1281-1 and ADM1281-3 combined); the Figure 4 pin diagram ; Pin types are not stated in the datasheet and were chosen per KiCad ERC classes: VCAP as power_out, ; Pins 9, 10 and 11 are marked DNC (Do Not Connect) in the datasheet, so they are listed as unconnecte",
"exposed pad 33 added from the footprint",
"dropped thermal pad ['EP'] absent from footprint"
],
"pages_sent": 22,
"cost_usd": 0.1508,
"at": "2026-11-04T12:51:39"
},
"datasheet": {
"url": "https://www.analog.com/media/en/technical-documentation/data-sheets/adm1281.pdf",
"pages": 63,
"sha256": "c234b2963102a5db",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 33,
"described": 33,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
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"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
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"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "5fa713ea46b36980895812ed853577889b7cb06d275041a39b99bc0be305dc79",
"checked": "2026-11-04",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "adm1281-1acpz-etched.step",
"role": "eda",
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"seat": "z = 0",
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"zmin_mm": 0,
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"footprint_binding": "identity",
"sha256": "c831d798945e4f1fd04d21c32469b8cbe0b0879506edc365baba2d839c42657f",
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},
"metadata": {
"specs": {
"Manufacturer": "Analog Devices",
"Package": "LFCSP-32(5x5)",
"Category": "",
"Pins": "33"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "c234b2963102a5dbef5aa58421aa78e8518831a47897f4a2dceca92ba222e998",
"rows": [
{
"name": "Quiescent Current",
"symbol": "ICC",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": null,
"max": 5.5,
"conditions": "GATE on and power monitor running",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Undervoltage Lockout",
"symbol": "UVLO",
"kind": "electrical",
"unit": "V",
"min": 2.4,
"typ": null,
"max": 2.7,
"conditions": "VCC rising",
"source_page": 4,
"source": "datasheet"
},
{
"name": "UV Threshold",
"symbol": "UVTH",
"kind": "electrical",
"unit": "V",
"min": 0.99,
"typ": 1,
"max": 1.01,
"conditions": "UV falling",
"source_page": 4,
"source": "datasheet"
},
{
"name": "OV Threshold",
"symbol": "OVTH",
"kind": "electrical",
"unit": "V",
"min": 0.99,
"typ": 1,
"max": 1.01,
"conditions": "OV rising",
"source_page": 4,
"source": "datasheet"
},
{
"name": "GATE Pull-Down Current Fast",
"symbol": "IGATEDN_FAST",
"kind": "electrical",
"unit": "mA",
"min": 1500,
"typ": 2400,
"max": 3000,
"conditions": "VGATE ≥ 12 V; VCC ≥ 12 V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "GATE Pull-Down Current Slow",
"symbol": "IGATEDN_SLOW",
"kind": "electrical",
"unit": "mA",
"min": 5,
"typ": 10,
"max": 15,
"conditions": "VGATE ≥ 2 V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "GATE Pull-Down Current Regulation",
"symbol": "IGATEDN_REG",
"kind": "electrical",
"unit": "μA",
"min": 45,
"typ": 60,
"max": 75,
"conditions": "VGATE ≥ 2 V; VISET = 1.0 V; (VHS+ − VHS−) = 30 mV",
"source_page": 4,
"source": "datasheet"
},
{
"name": "GATE Pull-Up Current",
"symbol": "IGATEUP",
"kind": "electrical",
"unit": "μA",
"min": -30,
"typ": null,
"max": -20,
"conditions": "VGATE = 0 V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "GATE Drive Voltage",
"symbol": "ΔVGATE",
"kind": "electrical",
"unit": "V",
"min": 10,
"typ": 12,
"max": 14,
"conditions": "20 V ≥ VCC ≥ 8 V; IGATE ≤ 5 μA",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Hot-Swap Sense Voltage Current Limit",
"symbol": "VSENSECL",
"kind": "electrical",
"unit": "mV",
"min": 19.75,
"typ": 20,
"max": 20.25,
"conditions": "VISET > 1.65 V; VGATE = (VHS+ + 3 V); IGATE = 0 μA",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Hot-Swap Sense Voltage Constant Power Inactive",
"symbol": "VSENSECL",
"kind": "electrical",
"unit": "mV",
"min": 24.75,
"typ": 25,
"max": 25.25,
"conditions": "VISET = 1.25 V; VDS < 2 V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Severe Overcurrent Voltage Threshold (225%, default at power-up)",
"symbol": "VSENSEOC",
"kind": "electrical",
"unit": "mV",
"min": 43,
"typ": 45,
"max": 47,
"conditions": "VISET > 1.65 V; VPSET > 1.1 V; default at power-up (225%)",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Severe Overcurrent Voltage Threshold (125%)",
"symbol": "VSENSEOC",
"kind": "electrical",
"unit": "mV",
"min": 23,
"typ": 25,
"max": 27,
"conditions": "VISET > 1.65 V; VPSET > 1.1 V; optional select PMBus (125%)",
"source_page": 5,
"source": "datasheet"
},
{
"name": "TIMER Pull-Up Current Overcurrent Fault",
"symbol": "ITIMERUPFLT",
"kind": "electrical",
"unit": "μA",
"min": -63,
"typ": -60,
"max": -57,
"conditions": "Overcurrent fault; 0.2 V ≤ VTIMER ≤ 1 V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "TIMER Pull-Up Current Power-On Reset",
"symbol": "ITIMERUPPOR",
"kind": "electrical",
"unit": "μA",
"min": -4,
"typ": -3,
"max": -2,
"conditions": "Initial power-on reset; VTIMER = 0.5 V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "TIMER Pull-Down Current Retry",
"symbol": "ITIMERDNRT",
"kind": "electrical",
"unit": "μA",
"min": 1.7,
"typ": 2,
"max": 2.3,
"conditions": "After fault when GATE is off; VTIMER = 0.5 V",
"source_page": 5,
"source": "datasheet"
},
{
"name": "TIMER High Threshold",
"symbol": "VTIMERH",
"kind": "electrical",
"unit": "V",
"min": 0.98,
"typ": 1,
"max": 1.02,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "TIMER Low Threshold",
"symbol": "VTIMERL",
"kind": "electrical",
"unit": "V",
"min": 0.18,
"typ": 0.2,
"max": 0.22,
"conditions": "",
"source_page": 5,
"source": "datasheet"
},
{
"name": "ENABLE Pin Input High Voltage",
"symbol": "VIH",
"kind": "electrical",
"unit": "V",
"min": 1.1,
"typ": null,
"max": null,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "ENABLE Pin Input Low Voltage",
"symbol": "VIL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.8,
"conditions": "",
"source_page": 6,
"source": "datasheet"
},
{
"name": "FAULT Pin Output Low Voltage",
"symbol": "VOL_LATCH",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.4,
"conditions": "IFAULT = 1 mA",
"source_page": 5,
"source": "datasheet"
},
{
"name": "CSOUT Total Output Error",
"symbol": "",
"kind": "tolerance",
"unit": "%",
"min": -1.6,
"typ": null,
"max": 1.6,
"conditions": "VSENSE_HS = 20 mV; ICSOUT ≤ 1 mA; CCSOUT = 1 nF",
"source_page": 6,
"source": "datasheet"
},
{
"name": "PWGIN Threshold",
"symbol": "PWGINTH",
"kind": "electrical",
"unit": "V",
"min": 0.99,
"typ": 1,
"max": 1.01,
"conditions": "PWGIN falling",
"source_page": 6,
"source": "datasheet"
},
{
"name": "ADC Conversion Time, One Sample of IOUT",
"symbol": "",
"kind": "timing",
"unit": "μs",
"min": 144,
"typ": null,
"max": 165,
"conditions": "One sample of IOUT; from command received to valid data in register",
"source_page": 6,
"source": "datasheet"
},
{
"name": "Input Current for Address Set to 00",
"symbol": "",
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