Bill of Materials

Complete list of all components needed to build the Moto32 control unit, with manufacturer part numbers and supplier information.

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Complete Component List

Passive Components

Capacitors

Capacitor Notes:

• Samsung brand ceramic capacitors recommended for reliability
• X7R or X5R dielectric for stability over temperature
• 0402 size requires precision placement (consider 0603 substitute if hand-soldering)
• Voltage rating: Minimum 10V for 3.3V rail, 25V for 12V rail

Resistors

Resistor Notes:

• UNI-ROYAL brand thick film resistors
• 1% tolerance for precision
• ±100ppm/°C temperature coefficient
• 0402 package (1.0mm × 0.5mm)

Semiconductors

MOSFETs

MOSFET Specifications:

• Type: P-Channel enhancement mode
• VDS: -40V
• ID: -11A continuous
• RDS(on): 45mΩ @ VGS=-10V
• Package: TO-252-2 (DPAK), surface mount
• Manufacturer: Diodes Incorporated

Key Features:

• Logic-level gate drive (3.3V compatible)
• Low on-resistance for efficiency
• Automotive-grade component
• Built-in body diode for inductive loads
• Thermal pad for heat dissipation

Diodes

Diode Notes:

• D1 (SS34): Input protection, reverse polarity
• D2, D3 (B5819W): General purpose Schottky
• D4, D5 (SMBJ58A): Transient voltage suppressors for ESD and surge protection

Integrated Circuits

Main Components

IC Descriptions:

U1 - ESP32-S3-WROOM-1-N8R2:

• Dual-core Xtensa LX7 @ 240MHz
• 8MB Flash memory
• 2MB PSRAM (pseudo-static RAM)
• Wi-Fi 802.11 b/g/n
• Bluetooth 5.0 LE
• 45 GPIO pins
• PCB antenna
• Operating: 3.0-3.6V

U2 - CH340C:

• USB 2.0 Full Speed (12Mbps)
• UART serial converter
• Baud rates up to 2Mbps
• Built-in clock (12MHz crystal required)
• 5V or 3.3V operation
• Automatic USB enumeration

U3 - AP63203WU-7:

• Input: 3.8V to 32V
• Output: 3.3V fixed
• Current: 2A maximum
• Switching frequency: 1.5MHz
• Efficiency: >90%
• Integrated switch (synchronous buck)
• Thermal shutdown, OCP, UVLO

Connectors & Mechanical

Connector Notes:

• USB-C1: Through-hole pins for mechanical strength, SMD pads for USB signals
• X1: Through-hole crystal with standard 20pF load capacitance

Cost Summary

Additional Components (Not on PCB)

These components are needed for installation but not part of the PCB assembly:

Sourcing Components

Primary Supplier: LCSC Electronics

Why LCSC?

• All LCSC part numbers provided in BOM
• Competitive pricing
• Ships worldwide
• Good stock availability
• Easy integration with PCBWay assembly service

Ordering from LCSC:

1. Go to LCSC.com
2. Upload the BOM CSV file (if supported)
3. Or search each LCSC part number manually
4. Add to cart and checkout
5. Select shipping method

Alternative Suppliers

If LCSC is not available or convenient:

Mouser Electronics

Global supplier with extensive inventory:

• Search by manufacturer part number
• May need to find equivalents
• Higher prices but faster shipping to US/Europe
• Excellent technical support

Example Equivalents:

• Capacitors: Any Samsung/Murata X7R with same value/voltage
• Resistors: Any 1% thick film with same value
• ESP32 module: Must be exact (ESP32-S3-WROOM-1)

DigiKey

Similar to Mouser:

• Large selection
• Premium pricing
• Fast delivery
• Good for prototypes

AliExpress / eBay

Budget options:

• Much cheaper for hobbyists
• Longer shipping times (4-8 weeks)
• Quality can vary
• Good for non-critical components
• Verify specifications carefully

Minimum Order Quantities (MOQ)

Most distributors have MOQs:

For Building Multiple Units:

• Order 10-20x quantity for safety margin
• Keep extras for repairs and future builds
• Split orders with friends to reduce cost

Component Substitutions

Acceptable Substitutes

Some components can be substituted with equivalents:

Capacitors

• Any Samsung/Murata/TDK: Same value, voltage, X7R/X5R dielectric
• Package size: Can use 0603 instead of 0402 (easier to solder)
• Voltage rating: Must meet or exceed requirement (16V+ for 12V rail, 10V+ for 3.3V rail)

Resistors

• Any brand: 1% tolerance, same package and value
• Package size: 0603 can replace 0402
• Power rating: 1/16W (0402) or 1/10W (0603) is adequate

MOSFETs

Use exact part or verified equivalents only:

• Must be P-channel
• VDS ≥ 40V
• ID ≥ 10A
• RDS(on) ≤ 100mΩ
• Logic-level gate (VGS(th) < 2V)
• TO-252 or similar package

Possible alternatives:

• IRF7404TRPBF
• DMP3098L
• Si4425DDY

Not Recommended for Substitution

These must be exact or carefully verified equivalents:

• ESP32-S3-WROOM-1: Specific pinout, firmware compatibility
• CH340C: Other CH340 variants may work but different pinouts
• AP63203WU-7: Other buck converters need circuit redesign
• TVS diodes: Voltage rating critical for protection

Purchasing Strategy

For One Unit (Prototype)

Total cost estimate: $30-50

• Order PCB from PCBWay: ~$20-30 for 5 pieces
• Order components from LCSC: ~$15-20 including shipping
• Shipping and taxes may apply

For Multiple Units (Small Batch)

Cost per unit: $15-25 (for 10 units)

• PCBs: Order more for volume discount
• Components: Buy 20x quantity (10% extra for mistakes)
• Consider PCBWay assembly service for consistent quality

PCBWay Assembly Service

Fully assembled unit: $50-100 per piece

PCBWay offers complete assembly:

1. Order PCBs with assembly service
2. Upload BOM and Pick & Place files
3. PCBWay sources all components
4. Automated assembly and inspection
5. Receive fully assembled, tested units

Benefits:

• No soldering required
• Professional quality
• Consistent results
• Saves time
• Good for first unit (reference for hand assembly)

Upload these files:

• Gerber_Canarin_MUX_PCB.zip
• BOM_Canarin_MUX.csv
• PickAndPlace_PCB_Canarin_MUX.csv

Quality Checks

Receiving Components

When components arrive:

• Verify quantities match order
• Check package integrity (no damaged bags)
• Inspect visually for obvious defects
• Organize by type in labeled containers
• Keep anti-static bags for storage

Component Identification

Reading Resistor/Capacitor Codes:

0402/0603 packages are too small for markings. Rely on:

• Original packaging with labels
• LCSC order list
• Organize carefully during assembly

IC Verification:

• Check marking on IC matches part number
• Look for date codes and manufacturer logo
• Beware blank/remarked ICs (counterfeits)

Storage

Proper storage extends component life:

• ESD protection: Keep ICs in anti-static bags
• Moisture control: Store in dry environment (use desiccant)
• Organization: Label everything clearly
• Temperature: Room temperature, avoid extremes

Next Steps

BOM Resources