my-kicad-lib/docs/Standard_Components_LCSC.md

Standard Components with LCSC Integration

This guide describes the system for standard passive components (R, C, L) and common ICs with LCSC part numbers.

🎯 Objectives

• Consistent assembly: Always use the same, well-available parts
• Cost optimization: LCSC Basic Parts for low costs
• Automation: Direct BOM generation for JLCPCB/LCSC
• Standardization: Fixed value series for all projects

📊 Standard Component Categories

Standard Passives (R/C/L)

• Purpose: Cost-optimized standard values with LCSC numbers
• Footprints: Use existing KiCad footprints (Resistor_SMD, Capacitor_SMD, Inductor_SMD)
• Symbols: Custom symbols with complete LCSC data
• Examples: 100nF_0603_C14663, 10k_0603_C25804, 100uH_0805_C1046

Standard ICs

• Purpose: Common ICs with LCSC numbers for automated assembly
• Categories:
  • CAN Controllers: MCP2515, SN65HVD230
  • STM32 MCUs: STM32F103C8T6, STM32F407VGT6
  • Voltage Regulators: AMS1117-3.3, LM2596
  • Op-Amps: LM358, LM324, TL074
  • Logic: 74HC595, 74HC4051
  • Interface: FT232RL, CH340G
• Footprints: Use existing KiCad footprints (Package_SO, Package_QFP, etc.)

🏷️ Naming Convention

Symbol Names

Standard Passives: [Value]_[Package]_[LCSC]
Standard ICs:      [Partnumber]_[Package]_[LCSC]

Examples:
100nF_0603_C14663
10k_0603_C25804
1uF_0805_C28323
STM32F103C8T6_LQFP-48_C8734
MCP2515_SOIC-18_C55199
AMS1117-3.3_SOT-223_C6186

Symbol Properties

Reference: R?, C?, L?, U?
Value: [Value] (e.g. "100nF", "10k", "STM32F103C8T6")
Footprint: [KiCad_Library]:[Standard_Footprint]
    Examples:
    - Resistor_SMD:R_0603_1608Metric
    - Capacitor_SMD:C_0603_1608Metric  
    - Package_SO:SOIC-18W_7.5x11.6mm_P1.27mm
    - Package_QFP:LQFP-48_7x7mm_P0.5mm
Datasheet: [LCSC-URL]
Description: [Full specification]
LCSC: [C-Number]
Manufacturer: [Manufacturer name]
MPN: [Manufacturer Part Number]
Package: [0603/SOIC-18/LQFP-48/etc.]

📋 LCSC Basic Parts Database

Resistors (UniOhm Thick Film, 1%)

Value	Package	LCSC	MPN	Description	Price@1k
0R	0603	C21189	0603WAF0000T5E	Res 0R 1/10W 0603	$0.002
10R	0603	C22859	0603WAF100JT5E	Res 10R 1% 1/10W 0603	$0.002
100R	0603	C22775	0603WAF1000T5E	Res 100R 1% 1/10W 0603	$0.002
1k	0603	C21190	0603WAF1001T5E	Res 1k 1% 1/10W 0603	$0.002
10k	0603	C25804	0603WAF1002T5E	Res 10k 1% 1/10W 0603	$0.002
100k	0603	C25803	0603WAF1003T5E	Res 100k 1% 1/10W 0603	$0.002

Capacitors (Samsung CL Series, X7R, 50V)

Value	Package	LCSC	MPN	Description	Price@1k
100pF	0603	C1524	CL10B101KB8NNNC	Cap 100pF 50V X7R 0603	$0.002
1nF	0603	C1523	CL10B102KB8NNNC	Cap 1nF 50V X7R 0603	$0.002
10nF	0603	C57112	CL10B103KB8NNNC	Cap 10nF 50V X7R 0603	$0.003
100nF	0603	C14663	CL10B104KB8NNNC	Cap 100nF 50V X7R 0603	$0.003
1µF	0603	C15849	CL10A105KA8NNNC	Cap 1µF 25V X5R 0603	$0.004
10µF	0805	C15850	CL21A106KAQNNNE	Cap 10µF 25V X5R 0805	$0.008

Standard ICs (LCSC Basic Parts)

Component	Package	LCSC	MPN	Description	Price@1k
STM32F103C8T6	LQFP-48	C8734	STM32F103C8T6	MCU 32-bit ARM Cortex M3	$2.89
MCP2515	SOIC-18	C55199	MCP2515-I/SO	CAN Controller	$1.67
SN65HVD230	SOIC-8	C12084	SN65HVD230DR	CAN Transceiver	$0.39
AMS1117-3.3	SOT-223	C6186	AMS1117-3.3	LDO 3.3V 1A	$0.11
LM358	SOIC-8	C7950	LM358DR	Dual Op-Amp	$0.11
74HC595	SOIC-16	C5947	74HC595D	8-bit Shift Register	$0.15
FT232RL	SSOP-28	C8690	FT232RL	USB to Serial	$3.45

🗂️ Library Structure

Symbol Libraries

symbols/
├── Standard_Passives.kicad_sym
│   ├── Resistors/
│   │   ├── 10R_0603_C22859
│   │   ├── 100R_0603_C22775  
│   │   ├── 1k_0603_C21190
│   │   └── ...
│   ├── Capacitors/
│   │   ├── 100nF_0603_C14663
│   │   ├── 1uF_0603_C15849
│   │   └── ...
│   └── Inductors/
│       ├── 100nH_0603_C1588
│       └── ...
└── Standard_ICs.kicad_sym
    ├── Microcontrollers/
    │   ├── STM32F103C8T6_LQFP-48_C8734
    │   └── ...
    ├── CAN/
    │   ├── MCP2515_SOIC-18_C55199
    │   ├── SN65HVD230_SOIC-8_C12084
    │   └── ...
    └── Power/
        ├── AMS1117-3.3_SOT-223_C6186
        └── ...

Footprint Mapping

Standard components use existing KiCad footprints:

Resistors → Resistor_SMD:R_[Package]_[Metric]
Capacitors → Capacitor_SMD:C_[Package]_[Metric]  
Inductors → Inductor_SMD:L_[Package]_[Metric]

ICs → Package_SO:SOIC-[pins]...
     Package_QFP:LQFP-[pins]...
     Package_TO_SOT_SMD:SOT-223...
     etc.

⚙️ Workflow

Adding New Standard Component

1. Research Phase

# Check if component exists in KiCad
1. Open KiCad Symbol Editor
2. Search for component in standard libraries
3. If exists: Note library and symbol name
4. If not exists: Create custom symbol

2. LCSC Lookup

# Find LCSC part number
1. Search component on lcsc.com
2. Check if it's a "Basic Part" (lower cost)
3. Verify stock status and pricing
4. Note: LCSC#, Manufacturer, MPN

3. Symbol Creation

# Create symbol with LCSC data
1. Use existing KiCad symbol as template (if available)
2. Add LCSC properties:
   - LCSC: C-Number
   - Manufacturer: Company name
   - MPN: Manufacturer Part Number
3. Set footprint to standard KiCad footprint
4. Add datasheet URL

4. Testing

# Verify in test circuit
1. Create test schematic
2. Run ERC (Electrical Rules Check)
3. Create test PCB
4. Run DRC (Design Rules Check)
5. Check 3D view

BOM Generation for JLCPCB

Export Format

Comment,Designator,Footprint,LCSC,Manufacturer,MPN
100nF,C1;C2;C5,C_0603_1608Metric,C14663,Samsung,CL10B104KB8NNNC
10k,R1;R3;R7,R_0603_1608Metric,C25804,UniOhm,0603WAF1002T5E
STM32F103C8T6,U1,LQFP-48_7x7mm_P0.5mm,C8734,STMicroelectronics,STM32F103C8T6

🎯 Best Practices

Component Selection Strategy

1. Always check LCSC first: Use Basic Parts when possible
2. Standardize values: Prefer E24 series for resistors
3. Package consistency: Use 0603 for most passives
4. Verify availability: Check stock before committing to design

Cost Optimization

Strategy	Savings	Implementation
Basic Parts only	50-80%	Use LCSC Basic Parts database
Standard packages	20-30%	Stick to 0603, SOIC, QFP
Volume planning	10-20%	Order 1000+ pieces
Setup minimization	$2-5 per unique part	Reuse same values

Design Guidelines

• 0603 preferred: Good balance of size/handling
• Basic Parts first: Always check Basic Parts availability
• Standard values: E24 series for resistors, E6 for capacitors
• Safety margins: +20% on critical values

🔄 Maintenance

Regular Updates

1. Monthly: Check LCSC availability and pricing
2. Quarterly: Update Basic Parts list
3. Per project: Verify all parts in stock before ordering
4. KiCad updates: Test footprint compatibility

Version Control

# Git workflow
git add symbols/Standard_*.kicad_sym
git commit -m "feat: add STM32F407 with LCSC C13303"
git tag -a v1.2.0 -m "Standard ICs v1.2.0"

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This document is regularly synchronized with current LCSC data.