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2 layers70 × 35 mmLiFePO4 Overcharge Protection V2, the printed circuit board in 3D

LiFePO4 Overcharge Protection V2

furpectfox/Circuits
Full screenGitHub.kicad_pcb
Size
70 × 35 mm
Copper layers
2
Thickness
1.6 mm
Parts
39
Nets
21
Pads
85
Tracks, vias
162, 0
Routed
Yes
KiCad
KiCad 8.0 (file 20240108)
Created
22 May 2025
Updated
8 Jun 2025

Overview

LiFePO4 Overcharge Protection V2 is an open-source printed circuit board by furpectfox, from the furpectfox/Circuits repository on GitHub. It is a 2-layer board of 70 × 35 mm with 39 parts on 21 nets, routed with 162 tracks and 0 vias.

It is built around the LM358 and IRF9540NS. Its parts include 17 resistors, 8 connectors, 4 transistors, 3 capacitors and 3 diodes.

Main components

2

Parts

39
QtyValueFootprintReferences
4Conn_01x01_PinConnector_Wire:SolderWire-0.1sqmm_1x01_D0.4mm_OD1mmJ5, J6, J7, J8
4Conn_01x02_PinTestPoint:TestPoint_2Pads_Pitch5.08mm_Drill1.3mmJ1, J2, J3, J4
210uCapacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mmC2, C3
212kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR9, R13
25.1kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR4, R12
256kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR8, R17
2Q_NPN_EBCPackage_TO_SOT_THT:TO-92L_Inline_WideQ1, Q4
2optionalResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR14, R16
110Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR15
110TestPoint:TestPoint_2Pads_Pitch5.08mm_Drill1.3mmR11
110kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR3
1150kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR6
118kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR2
122kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR7
139kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR5
14.7kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_HorizontalR1
147nCapacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mmC1
15.1kResistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_HorizontalR10
1BatteryTestPoint:TestPoint_2Pads_Pitch5.08mm_Drill1.3mmBT1
1IRF9540NPackage_TO_SOT_THT:TO-220-3_VerticalQ3
1LED_CHARGINGLED_THT:LED_D5.0mm_ClearD1
1LED_DONELED_THT:LED_D5.0mm_ClearD3
1LM358Package_DIP:DIP-8_W7.62mm_LongPadsU2
1Q_PNP_EBCPackage_TO_SOT_THT:TO-92L_Inline_WideQ2
1SW_PushUser_Library:SW_PushSW1
1TL431LPPackage_TO_SOT_THT:TO-92L_Inline_WideU1
1schottkyDiode_THT:D_DO-27_P15.24mm_HorizontalD2

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Questions

How big is the LiFePO4 Overcharge Protection V2 PCB?

It measures 70 × 35 mm and has 2 copper layers, 1.6 mm thick.

What parts does the LiFePO4 Overcharge Protection V2 use?

39 parts, built around the LM358 and IRF9540NS. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the LiFePO4 Overcharge Protection V2 KiCad files?

From the furpectfox/Circuits repository on GitHub, at the commit this page was made from: the board is LiFePO4_Overcharge_Protection_V2/LiFePO4_Overcharge_Protection_V2.kicad_pcb and its schematic 3v7cell_full_charge_detection/3v7cell_full_charge_detection.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the LiFePO4 Overcharge Protection V2 design in my own project?

Its repository states no licence, so its author keeps all rights: ask furpectfox before reusing the design.