component
MCP73831T-2ACI
Public Unreviewedby Ray
Microchip Tech Battery Management, SOT-23-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownMCP73831T-2ACI
Microchip Tech · Battery Management · SOT-23-5
MCP73831T-2ACI from Microchip Tech, in a SOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | STAT | output | Charge status output. On the MCP73831 this is a tri-state output (High, Low, High-Z) capable of sinking up to 25 mA (VOL ≈ 0.4 V at ISINK = 4 mA) and sourcing up to 35 mA (VOH ≥ VDD − 1 V at ISOURCE = 4 mA). Typically used to drive one or two status LEDs or interface to a host MCU. |
| 2 | VSS | power_in | Device ground / negative supply return. All input and output voltages are referenced to this pin. PROG programming resistor RPROG is returned to VSS. |
| 3 | VBAT | power_out | Battery charge control output. Drain of the internal P-channel pass MOSFET; delivers the constant charge current and regulated float voltage (factory-set to 4.20 V, 4.35 V, 4.40 V or 4.50 V ±0.75%) to the positive terminal of the single-cell Li-Ion / Li-Polymer pack. A ≥4.7 µF bypass capacitor to VSS is recommended for loop stability. |
| 4 | VDD | power_in | Battery management input supply. Accepts 3.75 V to 6 V (7 V absolute max). Below the UVLO stop threshold (VSTOP ≈ 3.38 V) the device enters power-down to prevent battery drain. A 4.7 µF bypass capacitor to VSS is recommended. |
| 5 | PROG | input | Current regulation set / device enable input. A resistor RPROG from PROG to VSS sets the fast-charge current per IREG = 1000 V / RPROG (RPROG = 2 kΩ to 67 kΩ → 15 mA to 500 mA). Allowing PROG to float, or forcing it to a logic high, disables the device and terminates the charge cycle (shutdown current ~25 µA typ). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SOT-23-5 |
| Category | Power Management (PMIC) |
| Pins | 5 |
Ordering variants
Same part, different packaging or reel option.
MCP73831T-2ACI/OTMCP73831T-2ACI/MC
CAD (KiCad official)
- Symbol:
MCP73831T-2ACI - Footprint:
Package_TO_SOT_SMD:SOT-23-5 - 3D model: SOT-23-5 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (28 pp, sha256
f2123088a8b39764, retrieved 2026-08-17, tier: lcsc) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).