RT7257BHZSP

{
  "schema_version": 1,
  "type": "component",
  "slug": "rt7257bhzsp",
  "title": "RT7257BHZSP",
  "brief": "Richtek Tech DC-DC Converters, SOIC-8-EP. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "pmic",
    "rt7257bhzsp"
  ],
  "component": {
    "mpn": "RT7257BHZSP",
    "manufacturer": "Richtek Tech",
    "package": "SOIC-8-EP",
    "pin_count": 9,
    "category": "PMIC",
    "subcategory": "DC-DC Converters",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/0b2ba4344836454fa596c261592116a7.pdf",
    "parts": {
      "symbol": "rt7257bhzsp.kicad_sym",
      "footprint": "rt7257bhzsp.kicad_mod",
      "model_3d": "rt7257bhzsp-etched.glb",
      "model_3d_plain": "rt7257bhzsp.glb",
      "model_3d_step": "rt7257bhzsp-etched.step",
      "model_3d_step_plain": "rt7257bhzsp.step",
      "lbr": "rt7257bhzsp.lbr"
    },
    "distributor_links": {
      "lcsc": "C27998"
    },
    "pins": [
      {
        "number": "1",
        "name": "BOOT",
        "type": "power_in",
        "description": "Bootstrap for high-side gate driver. Connect a 0.1μF or greater ceramic capacitor from BOOT to SW. V(BOOT)-V(SW) absolute max 6V."
      },
      {
        "number": "2",
        "name": "VIN",
        "type": "power_in",
        "description": "Input supply voltage, 4.5V to 18V (abs max 20V). Must be bypassed with a suitable large ceramic capacitor (e.g. 10μF x2 + 0.1μF)."
      },
      {
        "number": "3",
        "name": "SW",
        "type": "power_out",
        "description": "Switch node. Connect to an external L-C output filter. Swings between GND and VIN at up to 1.2MHz. High-side RDS(on) 110mΩ, low-side 90mΩ."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground. Pin 4 and the exposed pad (pin 9) must both be soldered to a large PCB copper area connected to GND for maximum power dissipation (θJA 75°C/W with exposed pad)."
      },
      {
        "number": "5",
        "name": "FB",
        "type": "input",
        "description": "Feedback input. Regulates the output via an external resistive voltage divider. Internal reference VREF = 0.8V (±1.5%)."
      },
      {
        "number": "6",
        "name": "COMP",
        "type": "output",
        "description": "Compensation node for the regulation control loop. Connect a series R-C network from COMP to GND; an optional additional capacitor from COMP to GND may be required in some cases."
      },
      {
        "number": "7",
        "name": "EN",
        "type": "input",
        "description": "Enable input. Logic high (VIH ≥ 2.7V) enables the converter; logic low (VIL ≤ 0.4V) puts the device into shutdown (<3μA supply). Tie to VIN via a 100kΩ pull-up for automatic startup. Absolute max 20V."
      },
      {
        "number": "8",
        "name": "SS",
        "type": "input",
        "description": "Soft-start control input. Connect a capacitor from SS to GND to set the soft-start period; a 0.1μF cap gives ~13.5ms (ISS = 6μA typ)."
      },
      {
        "number": "9",
        "name": "GND",
        "type": "power_in",
        "description": "Ground. Pin 4 and the exposed pad (pin 9) must both be soldered to a large PCB copper area connected to GND for maximum power dissipation (θJA 75°C/W with exposed pad)."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/0b2ba4344836454fa596c261592116a7.pdf",
        "pages": 14,
        "sha256": "f9aaf4883cb3a8fc",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm@sha256:a7971720bdda0353",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "rt7257bhzsp.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.55
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "2d6f7e774e8143e3320cbd59eb5be9f3b7864614644e3b072006e1eb05fb7fa6",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "rt7257bhzsp-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.55
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "4bb7e76b1b27ab10488e72ab990ab470022dc6a1af938a3fdf370e55bfa88cfb",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Richtek Tech",
      "Package": "SOIC-8-EP",
      "Category": "PMIC",
      "Pins": "8"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "f9aaf4883cb3a8fc",
      "rows": [
        {
          "name": "Supply Input Voltage",
          "symbol": "VIN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 20,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Switch Voltage",
          "symbol": "VSW",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": null,
          "conditions": "Printed as (VIN + 0.3V); maximum is not a fixed number",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "VBOOT − VSW",
          "symbol": "VBOOT − VSW",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 6,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Other Pins Voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 20,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Power Dissipation, SOP-8 (Exposed Pad)",
          "symbol": "PD",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 1.333,
          "conditions": "TA = 25°C",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Package Thermal Resistance, SOP-8 (Exposed Pad) junction to ambient",
          "symbol": "θJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 75,
          "max": null,
          "conditions": "Note 2: TA = 25°C, four-layer JEDEC 51-7 test board",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Package Thermal Resistance, SOP-8 (Exposed Pad) junction to case",
          "symbol": "θJC",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 15,
          "max": null,
          "conditions": "Measured at exposed pad",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Lead Temperature (Soldering)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 260,
          "conditions": "10 sec soldering",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Junction Temperature",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature Range",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "ESD Susceptibility HBM",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "kV",
          "min": null,
          "typ": null,
          "max": 2,
          "conditions": "Human Body Model",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Supply Input Voltage",
          "symbol": "VIN",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 4.5,
          "typ": null,
          "max": 18,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Junction Temperature Range",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Ambient Temperature Range",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Shutdown Supply Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "A",
          "min": null,
          "typ": 0.5,
          "max": 3,
          "conditions": "VEN = 0V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Supply Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.8,
          "max": 1.2,
          "conditions": "VEN = 3V, VFB = 0.9V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Reference Voltage",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "V",
          "min": 0.788,
          "typ": 0.8,
          "max": 0.812,
          "conditions": "4.5V VIN 18V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "High Side Switch Leakage Current",
          "symbol": "",
          "kind": "electrical",
          "unit": "A",
          "min": null,
          "typ": 0,
          "max": 10,
          "conditions": "VEN = 0V, VSW = 0V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Oscillation Frequency",
          "symbol": "fOSC1",
          "kind": "electrical",
          "unit": "MHz",
          "min": 1,
          "typ": 1.2,
          "max": 1.4,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "EN Input Threshold Logic-High Voltage",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 2.7,
          "typ": null,
          "max": 18,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "EN Input Threshold Logic-Low Voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.4,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Input Under Voltage Lockout Threshold",
          "symbol": "VUVLO",
          "kind": "electrical",
          "unit": "V",
          "min": 3.8,
          "typ": 4.2,
          "max": 4.5,
          "conditions": "VIN Rising",
          "source_page": 5,
          "source": "datasheet"
        }
      ]
    }
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  "discovery_triggers": [
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  "discovery_pitch": "RT7257BHZSP (Richtek Tech) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
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  "variants": [
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      "mpn": "RT7257BHZSP",
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    {
      "mpn": "RT7257BHZSPLZSP",
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  "updated_at": "2026-09-25T05:14:30.282Z"
}