HE4054B

{
  "schema_version": 1,
  "type": "component",
  "slug": "he4054b",
  "title": "HE4054B",
  "brief": "HEERMICR Battery Management ICs, SOT-23-5. 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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    "power management ics",
    "he4054b",
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  "component": {
    "mpn": "HE4054B",
    "manufacturer": "HEERMICR",
    "package": "SOT-23-5",
    "pin_count": 5,
    "category": "Power Management ICs",
    "subcategory": "Battery Management ICs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/ee4c8b48a35241f59df5ecacefcd8bc7.pdf",
    "parts": {
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    "distributor_links": {
      "lcsc": "C711953"
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      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
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      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "CHRG",
        "type": "output",
        "description": "Open-drain charge status output pulled low by an internal N-channel MOSFET while charging, high-impedance when charging is complete or in undervoltage lockout."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "3",
        "name": "BAT",
        "type": "power_out",
        "description": "Charge current output to the battery that regulates the final float voltage to 4.2V, with reverse-battery protection drawing about 0.7mA between GND and BAT."
      },
      {
        "number": "4",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply input from 4.25V to 6.5V that requires a bypass capacitor of at least 1µF, entering shutdown when VCC is within 30mV of BAT."
      },
      {
        "number": "5",
        "name": "PROG",
        "type": "bidirectional",
        "description": "Charge current program, monitor and shutdown pin set by a 1% resistor to ground (IBAT = VPROG/RPROG x 1000) with 1V in constant-current mode, shutdown above 1.21V and clamp voltage of about 2.4V."
      }
    ],
    "provenance": {
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        "at": "2026-10-23T09:08:31"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 5,
        "described": 5,
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        "refuses_to_fabricate": true
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  "metadata": {
    "specs": {
      "Manufacturer": "HEERMICR",
      "Package": "SOT-23-5",
      "Category": "Power Management ICs",
      "Pins": "5"
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        {
          "name": "Manual shutdown threshold",
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          "min": 1.15,
          "typ": 1.21,
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        {
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          "name": "C/10 termination threshold current",
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          "kind": "electrical",
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        {
          "name": "CHRG pin output low voltage",
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        {
          "name": "Recharge hysteresis voltage",
          "symbol": "ΔVRECG",
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        {
          "name": "Charge comparator filter time",
          "symbol": "tRECHG",
          "kind": "timing",
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          "min": 0.8,
          "typ": 1.8,
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          "conditions": "VBAT从高到低",
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        {
          "name": "Termination comparator filter time",
          "symbol": "tTERM",
          "kind": "timing",
          "unit": "mS",
          "min": 0.63,
          "typ": 1.4,
          "max": 3,
          "conditions": "IBAT跌至ICHG / 10以下",
          "source_page": 8,
          "source": "datasheet"
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        {
          "name": "PROG pull-up current",
          "symbol": "IPROG",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 2,
          "max": null,
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        {
          "name": "Input voltage",
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          "name": "BAT pin voltage",
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          "name": "CHRG pin voltage",
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          "name": "Power dissipation",
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          "name": "Human body model ESD",
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