DP83848JSQ

{
  "schema_version": 1,
  "type": "component",
  "slug": "dp83848jsq",
  "title": "DP83848JSQ",
  "brief": "Texas Instruments Ethernet Controllers, WQFN-40-EP(6x6). Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "interface",
    "dp83848jsq"
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  "component": {
    "mpn": "DP83848JSQ",
    "manufacturer": "Texas Instruments",
    "package": "WQFN-40-EP(6x6)",
    "pin_count": 41,
    "category": "Interface",
    "subcategory": "Ethernet Controllers",
    "datasheet": "https://www.ti.com/lit/ds/symlink/dp83848jsq.pdf",
    "parts": {
      "symbol": "dp83848jsq.kicad_sym",
      "footprint": "dp83848jsq.kicad_mod",
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      "lbr": "dp83848jsq.lbr"
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    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "IOVDD33",
        "type": "power_in",
        "description": "I/O 3.3 V supply."
      },
      {
        "number": "2",
        "name": "TX_CLK",
        "type": "output",
        "description": "MII Transmit Clock: 25 MHz output in 100 Mb/s or 2.5 MHz in 10 Mb/s mode, derived from the 25 MHz reference clock. Unused in RMII mode (X1 is the 50 MHz reference)."
      },
      {
        "number": "3",
        "name": "TX_EN",
        "type": "input",
        "description": "MII/RMII Transmit Enable: active-high input indicating presence of valid data on TXD[3:0] (MII) or TXD[1:0] (RMII). Internal pulldown."
      },
      {
        "number": "4",
        "name": "TXD_0",
        "type": "input",
        "description": "MII/RMII Transmit Data bit 0. Data synchronous to TX_CLK (MII) or the 50 MHz X1 reference (RMII)."
      },
      {
        "number": "5",
        "name": "TXD_1",
        "type": "input",
        "description": "MII/RMII Transmit Data bit 1."
      },
      {
        "number": "6",
        "name": "TXD_2",
        "type": "input",
        "description": "MII Transmit Data bit 2. Unused in RMII mode."
      },
      {
        "number": "7",
        "name": "TXD_3",
        "type": "input",
        "description": "MII Transmit Data bit 3. Unused in RMII mode. Internal pulldown."
      },
      {
        "number": "8",
        "name": "RESERVED",
        "type": "unconnected",
        "description": "Reserved - must be left unconnected."
      },
      {
        "number": "9",
        "name": "RESERVED",
        "type": "unconnected",
        "description": "Reserved - must be left unconnected."
      },
      {
        "number": "10",
        "name": "RESERVED",
        "type": "unconnected",
        "description": "Reserved - must be left unconnected."
      },
      {
        "number": "11",
        "name": "RD-",
        "type": "bidirectional",
        "description": "Differential receive input (PMD Input Pair, negative). Auto-configures to 100BASE-TX or 10BASE-T. In Auto-MDIX mode this pair can be reassigned as the Transmit Output pair. Requires 3.3 V bias."
      },
      {
        "number": "12",
        "name": "RD+",
        "type": "bidirectional",
        "description": "Differential receive input (PMD Input Pair, positive). Auto-MDIX may swap this pair with TD±. Requires 3.3 V bias."
      },
      {
        "number": "13",
        "name": "AGND",
        "type": "power_in",
        "description": "Analog ground."
      },
      {
        "number": "14",
        "name": "TD-",
        "type": "bidirectional",
        "description": "Differential common driver transmit output (PMD Output Pair, negative). Auto-configures to 10BASE-T/100BASE-TX. In Auto-MDIX mode may serve as the Receive Input pair. Requires 3.3 V bias."
      },
      {
        "number": "15",
        "name": "TD+",
        "type": "bidirectional",
        "description": "Differential common driver transmit output (PMD Output Pair, positive). Auto-MDIX may swap with RD±. Requires 3.3 V bias."
      },
      {
        "number": "16",
        "name": "PFBIN1",
        "type": "power_in",
        "description": "Power Feedback Input. Fed from PFBOUT via a 0.1 µF decoupling capacitor. Do NOT supply power from any source other than PFBOUT."
      },
      {
        "number": "17",
        "name": "AGND",
        "type": "power_in",
        "description": "Analog ground."
      },
      {
        "number": "18",
        "name": "AVDD33",
        "type": "power_in",
        "description": "Analog 3.3 V supply."
      },
      {
        "number": "19",
        "name": "PFBOUT",
        "type": "power_out",
        "description": "Power Feedback Output. Requires parallel decoupling caps (10 µF tantalum preferred + 0.1 µF) placed close to the pin. Connects to PFBIN1 (pin 16) and PFBIN2 (pin 30)."
      },
      {
        "number": "20",
        "name": "RBIAS",
        "type": "passive",
        "description": "Bias Resistor Connection. Requires a 4.87 kΩ 1% resistor to GND."
      },
      {
        "number": "21",
        "name": "LED_SPEED/AN1",
        "type": "bidirectional",
        "description": "Speed LED indicator (ON at 100 Mb/s, OFF at 10 Mb/s) muxed with AN1 auto-negotiation advertisement strap. AN1/AN0 straps set the advertised operating mode; use a 2.2 kΩ pullup/pulldown to override the internal pullup default. Internal weak pullup."
      },
      {
        "number": "22",
        "name": "LED_LINK/AN0",
        "type": "bidirectional",
        "description": "Link LED (Mode 1) or Link/Activity LED (Mode 2) muxed with AN0 auto-negotiation advertisement strap. Selects advertised speed/duplex per the AN[1:0] strap table. Internal weak pullup."
      },
      {
        "number": "23",
        "name": "RESET_N",
        "type": "input",
        "description": "Active-low reset input. Assert low for at least 1 µs to force a full reset; all internal registers re-initialize to defaults defined in the Register Block section, and all strap options are re-sampled. Internal pullup."
      },
      {
        "number": "24",
        "name": "MDIO",
        "type": "bidirectional",
        "description": "Management Data I/O: bi-directional MII management data signal sourced by either the station management entity or the PHY. Requires an external 1.5 kΩ pullup resistor."
      },
      {
        "number": "25",
        "name": "MDC",
        "type": "input",
        "description": "Management Data Clock: synchronous clock for MDIO. May be asynchronous to TX/RX clocks. 25 MHz maximum, no minimum clock rate."
      },
      {
        "number": "26",
        "name": "IOVDD33",
        "type": "power_in",
        "description": "I/O 3.3 V supply."
      },
      {
        "number": "27",
        "name": "X2",
        "type": "output",
        "description": "Crystal Output: connect to an external 25 MHz crystal resonator across X1/X2. Leave unconnected if an external CMOS oscillator source is used on X1."
      },
      {
        "number": "28",
        "name": "X1",
        "type": "input",
        "description": "Crystal/Oscillator Input: primary clock reference. Connect a 25 MHz ±50 ppm crystal (across X1/X2) or a CMOS-level oscillator to X1 only. In RMII mode X1 must be driven by a 50 MHz ±50 ppm CMOS oscillator."
      },
      {
        "number": "29",
        "name": "DGND",
        "type": "power_in",
        "description": "Digital ground."
      },
      {
        "number": "30",
        "name": "PFBIN2",
        "type": "power_in",
        "description": "Power Feedback Input. Fed from PFBOUT via a 0.1 µF decoupling capacitor. Do NOT supply power from any source other than PFBOUT."
      },
      {
        "number": "31",
        "name": "RX_CLK",
        "type": "output",
        "description": "MII Receive Clock: 25 MHz recovered receive clock in 100 Mb/s mode or 2.5 MHz in 10 Mb/s mode. Unused in RMII mode (X1 acts as the 50 MHz reference)."
      },
      {
        "number": "32",
        "name": "RX_DV/MII_MODE",
        "type": "bidirectional",
        "description": "MII Receive Data Valid output muxed with the MII_MODE strap. Strap default (no pullup) selects MII; strapping high (2.2 kΩ pullup) selects RMII mode. Internal pulldown, so default is MII."
      },
      {
        "number": "33",
        "name": "CRS/CRS_DV/LED_CFG",
        "type": "bidirectional",
        "description": "MII Carrier Sense (CRS) in MII mode, or combined Carrier Sense + Receive Data Valid (CRS_DV) in RMII mode; also LED_CFG strap that selects LED mode (default Mode 1, strap for Mode 2). Internal weak pullup."
      },
      {
        "number": "34",
        "name": "RX_ER/MDIX_EN",
        "type": "bidirectional",
        "description": "MII/RMII Receive Error output muxed with MDIX_EN strap. Default (internal pullup) enables Auto-MDIX; an external pulldown disables Auto-MDIX. Not required to be used by a MAC (the PHY corrupts data on receive errors)."
      },
      {
        "number": "35",
        "name": "COL/PHYAD0",
        "type": "bidirectional",
        "description": "MII Collision Detect output (RMII: recovered from CRS_DV) muxed with PHYAD0 strap bit. PHY address strap value (default 1) latched into PHYCTRL at reset; PHYAD=0 puts the PHY into MII Isolate Mode. Internal pullup."
      },
      {
        "number": "36",
        "name": "RXD_0/PHYAD1",
        "type": "bidirectional",
        "description": "MII/RMII Receive Data bit 0 (RXD[0] valid when RX_DV asserted) muxed with PHYAD1 strap bit. Internal pulldown (PHYAD[4:1])."
      },
      {
        "number": "37",
        "name": "RXD_1/PHYAD2",
        "type": "bidirectional",
        "description": "MII/RMII Receive Data bit 1 muxed with PHYAD2 strap bit. Internal pulldown."
      },
      {
        "number": "38",
        "name": "RXD_2/PHYAD3",
        "type": "bidirectional",
        "description": "MII Receive Data bit 2 (unused in RMII mode) muxed with PHYAD3 strap bit. Internal pulldown."
      },
      {
        "number": "39",
        "name": "RXD_3/PHYAD4",
        "type": "bidirectional",
        "description": "MII Receive Data bit 3 (unused in RMII mode) muxed with PHYAD4 strap bit. Internal pulldown."
      },
      {
        "number": "40",
        "name": "IOGND",
        "type": "power_in",
        "description": "I/O ground."
      },
      {
        "number": "41",
        "name": "DAP",
        "type": "power_in",
        "description": "Die Attach Pad (exposed thermal pad) on the underside of the WQFN-40 package. Connect to ground plane for proper thermal dissipation and grounding."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/dp83848jsq.pdf",
        "pages": 87,
        "sha256": "e9f526e34aad33d9",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 41,
        "described": 41,
        "cites_pages": true,
        "refuses_to_fabricate": true
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        "zmin_mm": 0,
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        "checked": "2026-10-07",
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "WQFN-40-EP(6x6)",
      "Category": "Interface",
      "Pins": "41"
    }
  },
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  "discovery_pitch": "DP83848JSQ (Texas Instruments) component page with datasheet-verified CAD.",
  "author": {
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      "mpn": "DP83848JSQ",
      "kind": "packaging"
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    {
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  "updated_at": "2026-09-24T19:53:41.559Z"
}