NCP1256ESN65T1G

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  "slug": "ncp1256esn65t1g",
  "title": "NCP1256ESN65T1G",
  "brief": "onsemi DC-DC Converters, TSOP-6. 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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    "power management (pmic)",
    "ncp1256esn65t1g",
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  "component": {
    "mpn": "NCP1256ESN65T1G",
    "manufacturer": "onsemi",
    "package": "TSOP-6",
    "pin_count": 6,
    "category": "Power Management (PMIC)",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588913533576744960",
    "parts": {
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      "lbr": "ncp1256esn65t1g.lbr"
    },
    "distributor_links": {
      "lcsc": "C603534",
      "digikey": "488-NCP1256ESN65T1GTR-ND",
      "mouser": "863-NCP1256ESN65T1G"
    },
    "distributor_check": {
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      "source": "Component Ocean /api/assign-pns",
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        "pn": "488-NCP1256ESN65T1GTR-ND",
        "status": "found",
        "lifecycle": "Active"
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        "pn": "863-NCP1256ESN65T1G",
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    },
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "The controller ground."
      },
      {
        "number": "2",
        "name": "FB",
        "type": "input",
        "description": "Feedback pin; hooking an optocoupler collector to this pin allows regulation."
      },
      {
        "number": "3",
        "name": "BO/OVP",
        "type": "input",
        "description": "Adjusts the brown-out level: a voltage below the programmed level stops the controller, and when the pin is brought above 4.5 V for four consecutive clock cycles the part latches off (on the E version it also provides auto-recovery ac line OVP)."
      },
      {
        "number": "4",
        "name": "CS",
        "type": "input",
        "description": "Monitors the primary peak current and provides OPP adjustment; when brought above 1.5 V during the off time the part permanently latches off."
      },
      {
        "number": "5",
        "name": "Vcc",
        "type": "power_in",
        "description": "Connected to the external auxiliary supply that powers the controller, with an internal OVP comparator monitoring this pin; the maximum continuous Vcc rating is −0.3 to 28 V and the OVP comparator trips at about 26 V typical."
      },
      {
        "number": "6",
        "name": "DRV",
        "type": "output",
        "description": "Driver output to an external MOSFET gate; the maximum DRV voltage is −0.3 to Vcc+0.3 V."
      }
    ],
    "provenance": {
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        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Pin numbers and names are taken from Table 1 (PIN DESCRIPTIONS) on page 3. The TSOP-6 outline drawin; The Vcc OVP timing on page 23 is garbled in the extracted text ('20 s'), so the filter time was omit; Pinout is identical across all NCP1256 variants in Table 2; the E-version-specific features (auto-re"
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        "at": "2026-10-19T05:04:59"
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  "metadata": {
    "specs": {
      "Manufacturer": "onsemi",
      "Package": "TSOP-6",
      "Category": "Power Management (PMIC)",
      "Pins": "6"
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          "typ": 18,
          "max": 20,
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        {
          "name": "Latched state reset voltage",
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        {
          "name": "Internal IC consumption",
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        {
          "name": "Maximum internal current setpoint - no OPP",
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          "typ": 0.8,
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        },
        {
          "name": "Voltage on pin 3 = 2.65 V (265 V rms in) AND VFB > VfoldF: OPP current",
          "symbol": "IOPP3",
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          "min": 170,
          "typ": 185,
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        {
          "name": "Internal OTA for OPP current generation from BO",
          "symbol": "OPPgm",
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          "max": 125,
          "conditions": "",
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        },
        {
          "name": "Oscillation frequency, 65 kHz version",
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          "typ": 65,
          "max": 70,
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        },
        {
          "name": "Maximum duty ratio",
          "symbol": "Dmax",
          "kind": "electrical",
          "unit": "%",
          "min": 77,
          "typ": 80,
          "max": 83,
          "conditions": "",
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        {
          "name": "Frequency jittering in percentage of fOSC",
          "symbol": "fjitter",
          "kind": "tolerance",
          "unit": "%",
          "min": -5,
          "typ": null,
          "max": 5,
          "conditions": "",
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        {
          "name": "Equivalent ac resistance from FB to gnd",
          "symbol": "Req",
          "kind": "electrical",
          "unit": "k",
          "min": 19,
          "typ": 23,
          "max": 26,
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          "name": "Minimum operating frequency",
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        {
          "name": "Latching level input, brown-out input",
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          "unit": "V",
          "min": 4.3,
          "typ": 4.5,
          "max": 4.7,
          "conditions": "",
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        {
          "name": "Latching level, current sense input",
          "symbol": "Vlatch2",
          "kind": "electrical",
          "unit": "V",
          "min": 1.45,
          "typ": 1.5,
          "max": 1.55,
          "conditions": "off time only",
          "source_page": 6,
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        },
        {
          "name": "Internal auto-recovery fault timer duration",
          "symbol": "Timer",
          "kind": "electrical",
          "unit": "ms",
          "min": 50,
          "typ": 70,
          "max": 90,
          "conditions": "",
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        {
          "name": "Latched over voltage protection on the Vcc rail",
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          "kind": "electrical",
          "unit": "V",
          "min": 25.3,
          "typ": 26,
          "max": 26.8,
          "conditions": "",
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          "name": "Turn-on voltage, BO comparator",
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          "min": 0.76,
          "typ": 0.8,
          "max": 0.87,
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          "name": "Turn-off voltage, BO comparator",
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          "unit": "V",
          "min": 0.66,
          "typ": 0.7,
          "max": 0.74,
          "conditions": "",
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          "name": "Supply voltage Vcc pin, continuous voltage",
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          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 28,
          "conditions": "continuous voltage",
          "source_page": 4,
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        {
          "name": "Maximum voltage on low power pins CS, FB and BO",
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          "min": -0.3,
          "typ": null,
          "max": 10,
          "conditions": "",
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        {
          "name": "Maximum voltage on DRV pin",
          "symbol": "VDRV",
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          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": null,
          "conditions": "upper limit printed as Vcc+0.3 V",
          "source_page": 4,
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        {
          "name": "Maximum Junction Temperature",
          "symbol": "TJ,max",
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          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
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          "name": "Storage Temperature Range",
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          "min": -60,
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          "name": "Human Body Model ESD Capability per JEDEC JESD22-A114F",
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          "kind": "absolute_maximum",
          "unit": "kV",
          "min": null,
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          "source_page": 4,
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        {
          "name": "Machine Model ESD Capability per JEDEC JESD22-A115C",
          "symbol": "MM",
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          "unit": "V",
          "min": null,
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          "name": "Charged-Device Model ESD Capability per JEDEC JESD22-C101E",
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          "min": null,
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        {
          "name": "Thermal Resistance Junction-to-Air",
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          "unit": "°C/W",
          "min": null,
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