4 layers125.7 × 76.5 mm
UGC Main R5
HandHeldLegend/GC-Ultimate
The 3D shell, buttons, and other associated models are licensed under a Creative Commons Attribution 4.0 International License .
159 parts62
4 layers140 × 51.5 mm
LatteJr Main Board
HandHeldLegend/Latte-Jr-HWThe 3D shell, buttons, and other associated models are licensed under a Creative Commons Attribution 4.0 International License .
- Size
- 140 × 51.5 mm
- Copper layers
- 4
- Thickness
- 1.25 mm
- Parts
- 129
- Nets
- 131
- Pads
- 627
- Tracks, vias
- 1,471, 310
- Pours
- 26
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 18 Nov 2025
- Updated
- 18 Jan 2026
Overview
LatteJr Main Board is an open-source printed circuit board by HandHeldLegend, from the HandHeldLegend/Latte-Jr-HW repository on GitHub. It is a 4-layer board of 140 × 51.5 mm with 129 parts on 131 nets, routed with 1,471 tracks and 310 vias.
It is built around the HAL4395NSO, USBLC6-2P6 and BQ25180YBGR, with the BQ27621YZFR-G1A, RC0201FR-07100RL and SK6805-EC10-000 among its other parts. Its parts include 37 resistors, 34 capacitors, 17 ICs, 9 switches and 6 connectors. It belongs with the RP2350 boards of this library.
Main components
12
HAL4395NSO
SOT-23-3LSOT-23-3L Linear Hall Sensors ROHSHallweeLinear Hall Sensors
USBLC6-2P6
SOT-666-6-40℃~+125℃ 150nA 17V 2 3.5pF 5.25V 5A@8/20us 6V ESD IEC 61000-4-2 Unidirectional SOT-666-6 ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)
BQ25180YBGR
DSBGA-8-40℃~+125℃ 1 1A 3.2uA 4.65V 5.5V Charging IC I2C Lithium Battery、LiFePO4 Battery Support 恒流充电、恒压充电、涓流充电、自动再充电、充电终止、可编程充电电流、过放保护、Overcurrent Protection、Short-Circuit Protection、过压保护 DSBGA-8(1.1x1.6) Battery Management ROHSTexas InstrumentsBattery Management
BQ27621YZFR-G1A
DSBGA-9-40℃~+85℃ 1 2.45V~4.5V 27uA I2C Lithium Battery Monitoring IC Support DSBGA-9 Battery Management ROHSTexas InstrumentsBattery Management
RC0201FR-07100RL
0201-55℃~+125℃ 100Ω 25V 50mW Thick Film Resistor ±1% ±200ppm/℃ 0201 Chip Resistor - Surface Mount ROHSYAGEOChip Resistor - Surface Mount
SK6805-EC10-000
SMD-4P,1.1x1.1mm-40℃~+80℃ 0.33mm 0.3mA 1.1mm 1.1mm 120mcd~240mcd 160° 2000V 3.5V~5.5V 40mcd~80mcd 460nm~470nm 4kHz 520nm~530nm 60mcd~120mcd 620nm~625nm 800Kbit/s Built-in power-on reset circuit、Built-in one-way transmission function Semi-transparent lens SMD-4P,1.1x1.1mm RGB LEDs(Built-in IC) ROHSOPSCO OptoelectronicsUncategorised
CUS08F30,H3F
SC-76(SOD-323)1 Independent 220mV@10mA 30V 50uA@30V 5A 800mA SC-76(SOD-323) Schottky Diodes ROHSToshibaSchottky Diodes
CL21A106KPFNNNE
080510V 10uF X5R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
CC0402FRNPO9BN150
040215pF 50V NP0 ±1% 0402 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSYAGEOMultilayer Ceramic Capacitors MLCC - SMD/SMTRC0201FR-075K1L
0201-55℃~+125℃ 25V 5.1kΩ 50mW Thick Film Resistor ±1% ±200ppm/℃ 0201 Chip Resistor - Surface Mount ROHSYAGEOChip Resistor - Surface Mount
BSS138DW-7-F-ES
SOT-363-55℃~+150℃ 1.5Ω@10V、1.6Ω@4.5V 1V 2 N-Channel 2.2pF 25pF 410mA 417mW 60V 650pC@4.5V 9.7pF N-Channel SOT-363 MOSFETs ROHSElecSuperMOSFETs
MIP25202R2MBE
10081.3A 2.2uH 80mΩ ±20% 1008 Inductors (SMD) ROHSINPAQInductors (SMD)
README
README.mdLatte Project
This is the official Github page for project Latte Jr from Hand Held Legend.
Software and PCB License
This firmware and PCB model are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
3D Models License
The 3D shell, buttons, and other associated models are licensed under a Creative Commons Attribution 4.0 International License.
Attributions
Resources Cross-Referenced for shell shape:
- 3D Scans by Wesk
Parts
129| Qty | Value | Footprint | References |
|---|---|---|---|
| 21 | 100n | Capacitor_SMD:C_0201_0603Metric | C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C28, C29, C30, C31, C32, C33 +5 |
| 16 | 100R | Resistor_SMD:R_0201_0603Metric | R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R30 |
| 14 | SK6805-EC-10 | hhl:SK6805-EC-10 | RGB1, RGB2, RGB3, RGB4, RGB5, RGB6, RGB7, RGB8, RGB9, RGB10, RGB11, RGB12, RGB13, RGB14 |
| 10 | 1k | Resistor_SMD:R_0201_0603Metric | R2, R3, R4, R5, R31, R32, R33, R34, R35, R36 |
| 10 | HAL4395 | hhl:SOT-23-5L | U2, U3, U9, U10, U11, U12, U13, U14, U15, U16 |
| 8 | SW_Push | hhl:KSC-TE | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 |
| 4 | 10k | Resistor_SMD:R_0201_0603Metric | R24, R26, R27, R29 |
| 4 | 4.7u | Capacitor_SMD:C_0402_1005Metric | C1, C2, C6, C7 |
| 3 | CUS08F30,H3F | Diode_SMD:D_SOD-323_HandSoldering | D1, D3, D4 |
| 3 | USBLC6-2P6 | Package_TO_SOT_SMD:SOT-666 | U6, U7, U8 |
| 2 | 10uF | Capacitor_SMD:C_0805_2012Metric | C25, C27 |
| 2 | 15pF | Capacitor_SMD:C_0402_1005Metric | C3, C4 |
| 2 | 1uF | Capacitor_SMD:C_0201_0603Metric | C20, C22 |
| 2 | 27R | Resistor_SMD:R_0201_0603Metric | R6, R7 |
| 2 | 5.1k | Resistor_SMD:R_0201_0603Metric | R37, R38 |
| 2 | BSS138DW | Package_TO_SOT_SMD:SOT-363_SC-70-6 | Q1, Q2 |
| 2 | Conn_01x04_Pin | hhl:5051100492 | J4, J5 |
| 2 | TestPoint | TestPoint:TestPoint_Pad_D1.0mm | TP1, TP2 |
| 1 | 0.47uF | Capacitor_SMD:C_0201_0603Metric | C21 |
| 1 | 0R | Resistor_SMD:R_0201_0603Metric | R25 |
| 1 | 1.3A 2.2uH ±20% 80mΩ | Inductor_SMD:L_1008_2520Metric | L3 |
| 1 | 100nF | Capacitor_SMD:C_0201_0603Metric | C26 |
| 1 | 1TS026A-1000-0550 | hhl:1TS026A-1000-0550 | SW9 |
| 1 | 3.3u | hhl:L_pol_2016 | L1 |
| 1 | 33 | Resistor_SMD:R_0201_0603Metric | R1 |
| 1 | 470R | Resistor_SMD:R_0201_0603Metric | R28 |
| 1 | 47uF | Capacitor_Tantalum_SMD:CP_EIA-3216-18_Kemet-A | C24 |
| 1 | ABM8-272-T3 | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | BLM18AG601SN1D | Inductor_SMD:L_0603_1608Metric | L2 |
| 1 | BQ25180 | hhl:DSBGA | U5 |
| 1 | BQ27621YZFR-G1A | hhl:BGA9C50P3X3_162X158X62 | IC1 |
| 1 | Conn_01x02_Socket | Connector_Molex:Molex_PicoBlade_53048-0210_1x02_P1.25mm_Horizontal | J6 |
| 1 | Conn_01x04_Pin | Connector_PinHeader_2.00mm:PinHeader_1x04_P2.00mm_Vertical | J1 |
| 1 | RP2350_60QFN | hhl:RP2350-QFN-60-1EP_7x7_P0.4mm_EP3.4x3.4mm_ThermalVias | U1 |
| 1 | RPI-RM2 | hhl:RPI_RM2 | P1 |
| 1 | TPS63001DRCR | hhl:VREG_V62_16624-01YE | U4 |
| 1 | USB4056-03-A | hhl:USB405603A | J3 |
The 128 most common of 129 parts.
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Questions
How big is the LatteJr Main Board PCB?
It measures 140 × 51.5 mm and has 4 copper layers, 1.25 mm thick.
What parts does the LatteJr Main Board use?
129 parts, built around the HAL4395NSO, USBLC6-2P6, BQ25180YBGR and BQ27621YZFR-G1A. 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 LatteJr Main Board KiCad files?
From the HandHeldLegend/Latte-Jr-HW repository on GitHub, at the commit this page was made from: the board is PCB/Projects/Main Board/LatteJr_Main_Board.kicad_pcb and its schematic PCB/Projects/Main Board/LatteJr_Main_Board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the LatteJr Main Board design in my own project?
Its repository states no licence, so its author keeps all rights: ask HandHeldLegend before reusing the design.