Generated BOM below with **U2, A RS485 B, J1, and J2 excluded / DNP**. Pricing basis: **lowest available unit price shown in Flux BOM distributor data**. Items with no distributor pricing are marked **N/A** and excluded from the known-priced subtotal. ## Capacitors | Designator(s) | Qty | Value | Package | MPN | Manufacturer | Description | Est. Unit | Ext. | |---|---:|---|---|---|---|---|---:|---:| | C1, C2, C6, C10, C11, C12 | 6 | 0.1 µF | 0603 | Not specified | Not specified | Ceramic capacitor | N/A | N/A | | C3, C4, C8 | 3 | 10 µF | 0603 | Not specified | Not specified | Ceramic capacitor | N/A | N/A | | C5, C9 | 2 | 10 µF | 0805 | Not specified | Not specified | Ceramic capacitor | N/A | N/A | ## Resistors | Designator(s) | Qty | Value | Package | MPN | Manufacturer | Description | Est. Unit | Ext. | |---|---:|---|---|---|---|---|---:|---:| | R1, R8, R9 | 3 | 10 kΩ | 0603 | Not specified | Not specified | Chip resistor | N/A | N/A | | R2, R3 | 2 | 5.1 kΩ | 0603 | Not specified | Not specified | USB-C CC resistor | N/A | N/A | | R4 | 1 | 1 kΩ | 0603 | Not specified | Not specified | LED/current-limit resistor | N/A | N/A | | R5, R6, R7 | 3 | 10 Ω | 0603 | Not specified | Not specified | Series resistor | N/A | N/A | ## Diodes / Protection | Designator(s) | Qty | Value | Package | MPN | Manufacturer | Description | Est. Unit | Ext. | |---|---:|---|---|---|---|---|---:|---:| | D1 | 1 | Schottky diode, 40 V, 1 A | SOD-123 | 1N5819HW-7-F | Diodes Incorporated | Schottky diode | $0.03279 | $0.03279 | | D2 | 1 | USB TVS array | SOT-23-6L | 82400102 | Würth Elektronik | 7.7 V typ clamp TVS diode array | $0.73282 | $0.73282 | | D3 | 1 | RS-485 TVS | SOT-23 | SM712 | MDD | RS-485 transient voltage suppressor | $0.02142 | $0.02142 | ## LEDs | Designator(s) | Qty | Value | Package | MPN | Manufacturer | Description | Est. Unit | Ext. | |---|---:|---|---|---|---|---|---:|---:| | PWR | 1 | Indicator LED | 0805 | Not specified | Not specified | Power indicator LED | N/A | N/A | ## Switches | Designator(s) | Qty | Value | Package | MPN | Manufacturer | Description | Est. Unit | Ext. | |---|---:|---|---|---|---|---|---:|---:| | RST, BOOT | 2 | SPST-NO tactile switch | Side-actuated SMD | TL3330AF260QG | E-Switch | Right-angle tactile switch | $0.31 | $0.62 | ## Connectors | Designator(s) | Qty | Value | Package | MPN | Manufacturer | Description | Est. Unit | Ext. | |---|---:|---|---|---|---|---|---:|---:| | USB1 | 1 | USB-C receptacle | 24-pin USB-C, 8.94 × 7.3 mm | TYPE-C-31-M-12 | Korean Hroparts Elec | USB Type-C receptacle | $0.15864 | $0.15864 | ## Transistors | Designator(s) | Qty | Value | Package | MPN | Manufacturer | Description | Est. Unit | Ext. | |---|---:|---|---|---|---|---|---:|---:| | Q1, Q2 | 2 | N-channel MOSFET | SOT-23-3 | BSS138 | onsemi | 50 V, 220 mA N-channel MOSFET | $0.00745 | $0.01490 | ## Integrated Circuits / Regulators | Designator(s) | Qty | Value | Package | MPN | Manufacturer | Description | Est. Unit | Ext. | |---|---:|---|---|---|---|---|---:|---:| | IC1 | 1 | USB-UART bridge | SOIC-16 | CH340C | WCH / Wah | USB-to-serial converter | $0.50530 | $0.50530 | | IC3 | 1 | RS-485 transceiver | SOIC-8 | MAX3485CSA+ | Maxim Integrated | Half-duplex RS-485 / RS-422 transceiver | $3.00600 | $3.00600 | | U1 | 1 | 3.3 V LDO regulator | SOT-223 | AMS1117-3.3 | AMS | 3.3 V linear regulator | $0.02140 | $0.02140 | ## DNP / Excluded From BOM | Designator | Reason | |---|---| | U2 | User requested not populated | | A RS485 B | User requested not populated | | J1 | User requested not populated | | J2 | User requested not populated | ## Cost Summary - Populated BOM quantity: **32 components** - Known-priced subtotal: **$5.11** - Items without available pricing: **capacitors, resistors, and PWR LED** - Estimated total using available pricing only: **$5.11+** Actual total will be higher once specific priced passives and LED are selected.