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Mainboard (Logic Board)

Assembly

Stacked HDI logic board carrying the SoC, memory, RF, and power management. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.

Mainboard (Logic Board) parts and their functions

19 top-level parts · 1,328 parts in total · full bill of materials below
Mainboard (Logic Board) parts diagram: 1 bare PCB, 2 compute SoC module, 3 LPDDR5 DRAM, 4 UFS flash storage, 5 power management IC, 6 RF transceiver, 7 5G modem, 8 RF power amplifier module, 9 WiFi/BT combo IC, 10 audio codec IC, 11 SMD passive (R/C/L), 12 connector, 13 refined tin ingot, 14 capacitor-grade tantalum powder, 15 gold bond wire / plating stock, and 4 more. 1,328 parts in 19 top-level items.
Mainboard (Logic Board) parts diagram. Numbers match the table below; each box is one top-level part or assembly with what it contains.
#PartQtyWhat it does
1 Bare PCB 1× HDI substrate
2 Compute SoC Module 1× Application processor SoC
3 LPDDR5 DRAM 1× LPDDR5 DRAM (PoP)
4 UFS Flash Storage 1× UFS flash storage
5 Power Management IC 1× Power management IC
6 RF Transceiver 1× RF transceiver
7 5G Modem 1× 5G baseband modem
8 RF Power Amplifier Module 1 parts 3× Power amplifier front-end modules
9 WiFi/BT Combo IC 1× WiFi/BT combo IC
10 Audio Codec IC 1× Audio codec IC
11 SMD Passive (R/C/L) 1300× Decoupling, bias and termination resistors, capacitors and inductors across the board
12 Connector 8× Board-to-board / FPC connectors
13 Refined Tin Ingot 1 parts 1× ≈1 g SAC305 solder tin across all joints
14 Capacitor-Grade Tantalum Powder 1 parts 1× ≈40 mg in tantalum capacitors
15 Gold Bond Wire / Plating Stock 1 parts 1× ≈30 mg gold in bond wires and plating
16 Semiconductor Silicon 1 parts 1× ≈0.5 g of finished silicon die across all chips
17 Refined Silver 1× ≈300 mg in pastes, contacts, and MLCC terminations
18 Palladium Sponge 1× ≈10 mg in MLCC inner electrodes
19 Synthetic Quartz Crystal 2× Timing crystals (32 kHz + MHz)

3D model

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Build & assembly graph

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Bill of materials for Mainboard (Logic Board)

19 top-level lines · 26 rows shown · 1,328 parts total · indented to 3 levels
# Item / sub-assembly Part no. Qty/assy Ext. qty Parts Type
1 Bare PCB pcb-bare 1× 1 · part
2 Compute SoC Module soc-module 1× 1 · part
3 LPDDR5 DRAM smartphone-ram-lpddr 1× 1 · part
4 UFS Flash Storage smartphone-ufs-storage 1× 1 · part
5 Power Management IC smartphone-pmic 1× 1 · part
6 RF Transceiver smartphone-rf-transceiver 1× 1 · part
7 5G Modem smartphone-5g-modem 1× 1 · part
8 RF Power Amplifier Module 1 parts smartphone-pa-module 3× 3 1 assembly
8.1 Gallium Metal 1 parts gallium-metal 1× 3 1 assembly
8.1.1 Bauxite Ore bauxite-ore 1× 3 · part
9 WiFi/BT Combo IC smartphone-wifi-bt-combo 1× 1 · part
10 Audio Codec IC smartphone-audio-codec 1× 1 · part
11 SMD Passive (R/C/L) smd-passives 1300× 1,300 · part
12 Connector connector 8× 8 · part
13 Refined Tin Ingot 1 parts tin-ingot 1× 1 1 assembly
13.1 Cassiterite Concentrate cassiterite-concentrate 1× 1 · part
14 Capacitor-Grade Tantalum Powder 1 parts tantalum-powder 1× 1 1 assembly
14.1 Coltan Concentrate coltan-concentrate 1× 1 · part
15 Gold Bond Wire / Plating Stock 1 parts gold-bond-wire 1× 1 1 assembly
15.1 Gold Ore / Doré gold-ore-concentrate 1× 1 · part
16 Semiconductor Silicon 1 parts silicon-wafer-stock 1× 1 1 assembly
16.1 Polysilicon 1 parts polysilicon 1× 1 1 assembly
16.1.1 Metallurgical-Grade Silicon 1 parts + deeper › metallurgical-silicon 1× 1 1 assembly
17 Refined Silver refined-silver 1× 1 · part
18 Palladium Sponge palladium-sponge 1× 1 · part
19 Synthetic Quartz Crystal synthetic-quartz-crystal 2× 2 · part

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Where the mainboard (logic board) is used

1 product across 1 domain contain it, directly or inside a sub-assembly

Used in 1 assembly

Smartphone

Sourcing: possible vendors

Browse the supplier directory → Prices, MOQ, and lead times are algorithmic estimates, not quotes, and not claims about these companies. Company mappings are curated by keyword; est. price band $1–$200. How estimates work
VendorHQSpecialtyMOQLead time
🇨🇳JLCPCB
jlcpcb.com ↗ 		Shenzhen, CN PCB fabrication 100 pcs 2–4 wks
🇨🇳PCBWay
pcbway.com ↗ 		Shenzhen, CN PCB fab & assembly 100 pcs 2–4 wks
🇨🇳Shennan Circuits
scc.com.cn ↗ 		Shenzhen, CN PCB manufacturer 100 pcs 2–4 wks
🇮🇳Shogini Technoarts
shogini.com ↗ 		Mumbai, IN PCB manufacturer 100 pcs 2–4 wks
🇸🇬Venture Corp
venture.com.sg ↗ 		Singapore Electronics contract mfg 100 pcs 2–4 wks