SN6505B

{
  "schema_version": 1,
  "type": "component",
  "slug": "sn6505b",
  "title": "SN6505B",
  "brief": "TI low-noise push-pull transformer driver, SOT-23-6. For small isolated DC-DC supplies, up to 1 A switches. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "power",
    "transformer-driver",
    "isolated-supply",
    "push-pull",
    "sot-23-6",
    "texas-instruments"
  ],
  "component": {
    "mpn": "SN6505B",
    "manufacturer": "Texas Instruments",
    "package": "SOT-23-6",
    "pin_count": 6,
    "category": "Power Management",
    "subcategory": "Transformer driver",
    "datasheet": "https://www.ti.com/lit/ds/symlink/sn6505b.pdf",
    "parts": {
      "symbol": "sn6505b.kicad_sym",
      "footprint": "sn6505b.kicad_mod",
      "model_3d": "sn6505b-etched.glb",
      "model_3d_plain": "sn6505b.glb",
      "model_3d_step": "sn6505b-etched.step",
      "model_3d_step_plain": "sn6505b.step",
      "lbr": "sn6505b.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "D1",
        "type": "output",
        "description": "Open-drain output of the first power MOSFET (1 A, R_ON 0.25 Ω max at 4.5 V). Connects to one outer terminal of the center-tapped transformer primary. Traces should be kept short due to large switching currents."
      },
      {
        "number": "2",
        "name": "VCC",
        "type": "power_in",
        "description": "Device supply pin, 2.25 V to 5.5 V. Bypass with a 4.7 µF or greater low-ESR capacitor. Internal UVLO (positive-going 2.25 V, negative-going 1.7 V) turns both outputs off when VCC ≤ 2.25 V."
      },
      {
        "number": "3",
        "name": "D2",
        "type": "output",
        "description": "Open-drain output of the second power MOSFET (1 A, R_ON 0.25 Ω max at 4.5 V). Connects to the other outer terminal of the center-tapped transformer primary. Traces should be kept short due to large switching currents."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference; connected to the source of the power MOSFET switches via an internal sense circuit. Must be tied to a low-inductance quality ground plane because large switching currents flow through it."
      },
      {
        "number": "5",
        "name": "EN",
        "type": "input",
        "description": "Enable input. Logic high (≥0.7·VCC) enables the device; grounding or leaving floating disables all internal circuitry (I_DIS ≈ 0.1 µA). Tie directly to VCC if unused. Absolute max −0.5 V to VCC + 0.5 V."
      },
      {
        "number": "6",
        "name": "CLK",
        "type": "input",
        "description": "External clock input for synchronizing switching (100 kHz to 1600 kHz on SN6505B). Internally pulled down to GND; if no valid clock is detected the device automatically switches to its internal 420 kHz oscillator. Absolute max −0.5 V to VCC + 0.5 V."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/sn6505b.pdf",
        "pages": 43,
        "sha256": "dfc57cb042218cb6",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 6,
        "described": 6,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "sn6505b.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.8,
          2.9,
          1.55
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "c9fe686b4d1b56927a41fa84a9bc1efb61d8a45a123a3db43bcaa05c2891d635",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn6505b-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.8,
          2.9,
          1.55
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "4bd10461ad3670fadc23e40c534171e46782ffc1da351cff6053e5a0a7c98c39",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Push-pull transformer driver",
      "Switch current": "1 A",
      "Switching": "Fixed frequency (on-chip), spread-spectrum",
      "EMI control": "Slew-rate limited outputs",
      "Enable": "EN pin",
      "Sync": "CLK pin",
      "Supply": "2.25-5 V",
      "Package": "SOT-23-6"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "sn6505b",
    "transformer driver",
    "isolated dc-dc driver",
    "push pull driver for isolation"
  ],
  "discovery_pitch": "TI SN6505B low-noise push-pull transformer driver (SOT-23-6) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "sn6505b.kicad_sym",
    "sn6505b.kicad_mod",
    "sn6505b.glb",
    "sn6505b.step",
    "sn6505b.lbr",
    "docs/hero.png",
    "docs/sn6505b-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "sn6505b-etched.step"
  ],
  "variants": [
    {
      "mpn": "SN6505BDBVR (SOT-23-6, 420 kHz)",
      "kind": "packaging"
    },
    {
      "mpn": "SN6505ADBVR (160 kHz)",
      "kind": "unknown"
    }
  ]
}