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Complete Bill of Materials — SELV Spa-Light Switch Controller
Generated: 2026-06-25
Pricing note: Unit prices are estimated from available distributor ranges in Flux BOM data, using the lowest visible single-unit/price-break value where available. Prices are indicative only and exclude tax, shipping, minimum order quantity effects, alternate sourcing, and unavailable/no-price items. Currency: USD.
Cost Summary
- BOM-fitted physical quantity: 40 components
- Unique BOM line items: 23
- Known-priced estimated subtotal: ~$18.12 USD per board
- Items without usable pricing in the current BOM data: U3, U1, U2, D1/D2, J5, K1
- Excluded from BOM: No Connect symbols and Net Portals
Resistors
Table
| Designator(s) | Qty | Value | Package | MPN | Manufacturer | Description / Role | Est. Unit |
|---|---|---|---|---|---|---|---|
| R13 | 1 | 220kΩ | SMD_1206_3216Metric | CRCW1206220KFKEAHP | Vishay Dale | HV optocoupler input series resistor, 0.5W, 500V | ~$0.001+* |
| R12 | 1 | 220kΩ | SMD_1206_3216Metric | CRCW1206220KFKEAHP* | Vishay Dale* | HV optocoupler input series resistor | ~$0.001+* |
| R5, R8, R4, R9, R14, R3 | 6 | 10kΩ | SMD_0603_1608Metric | RC0603FR-0710KL | YAGEO | Pull-ups/dividers/ICSP/MCLR support | ~$0.001 |
| R16 | 1 | 100kΩ | SMD_0603_1608Metric | RC0603FR-07100KL | YAGEO | MOSFET gate pulldown | ~$0.001 |
| R2 | 1 | 10Ω | SMD_0603_1608Metric | RC0603FR-0710RL | YAGEO | Supercap inrush limiting | ~$0.001 |
| R6, R7 | 2 | 1kΩ | SMD_0603_1608Metric | RC0603FR-071KL | YAGEO | LED current limiting | ~$0.001 |
| R10, R11 | 2 | 4.7kΩ | SMD_0603_1608Metric | RC0603FR-074K7L | YAGEO | I2C pull-ups | ~$0.001 |
| R15 | 1 | 100Ω | SMD_0603_1608Metric | RC0603FR-07100RL* | YAGEO* | MOSFET gate resistor | ~$0.001 |
Resistor group pricing source includes YAGEO/Vishay resistor distributor ranges: approx. $0.0007–$0.10 depending source/quantity.
Capacitors and Inductors
Table
| Designator(s) | Qty | Value | Package | MPN | Manufacturer | Description / Role | Est. Unit |
|---|---|---|---|---|---|---|---|
| C1 | 1 | 1F, 5.5V | Radial can / SMD supercapacitor | FC0H105ZFTBR44-SS | Kemet | Hold-up supercapacitor | ~$5.5205 |
| C12 | 1 | 2.2uF, 50V | SMD_0805_2012Metric | CL21B225KBFNNNE | Samsung | Buck input ceramic capacitor | ~$0.004+* |
| C13, C2 | 2 | 10uF | SMD ceramic* | CL10B106* | Samsung/Murata* | Buck/LDO bulk and rail decoupling | ~$0.004+* |
| C4, C5 | 2 | 1uF | SMD_0603_1608Metric | GRM188R61E105KA12D | Murata | LDO input/output capacitors | ~$0.004+* |
| C14, C9, C8, C3, C6 | 5 | 100nF | SMD_0603_1608Metric | CL10B104KO8NNNC / CL10B104KB8NNNC* | Samsung | Bootstrap and IC decoupling | ~$0.004+* |
| C11, C7, C10 | 3 | 10nF | SMD_0603_1608Metric* | CL10B103KB8NNNC | Samsung | Filtering / signal conditioning | ~$0.004 |
| L1 | 1 | 4.7µH | SRN4018-style SMD inductor | SRN4018-4R7M | Bourns | Buck regulator inductor | ~$0.1354 |
Generic capacitor group pricing source includes Samsung/Murata capacitor distributor ranges: approx. $0.0022–$0.10 depending source/quantity.
Semiconductors, ICs, Optoelectronics, and Sensors
Table
| Designator(s) | Qty | Value | Package | MPN | Manufacturer | Description / Role | Est. Unit |
|---|---|---|---|---|---|---|---|
| U1 | 1 | PIC16LF18855 MCU | SOIC-28 | PIC16LF18855-I/SO | Microchip | 3.3V SELV control MCU | N/A |
| U2 | 1 | 3.3V LDO, 250mA | SOT-23 | MCP1703Ax-330xxTT | Microchip Technology Inc. | Low-Iq 3.3V regulator | N/A |
| U3 | 1 | 40kHz IR receiver | Vishay MOLD-3Pin | TSOP32S40F | Vishay* | Optical programming / IR receiver | N/A |
| U4 | 1 | AC/DC optocoupler | SOP-4 4.4x2.6mm P1.27 | FODM214 | onsemi* | Mains-present isolated detection | ~$0.1553 |
| U5 | 1 | Ambient light sensor | 4-SMD J-lead | VEML7700-TR | Vishay | I2C ambient light sensor | ~$0.5931 |
| U6 | 1 | 5V 1A buck regulator | SOT-23-6 | LMR50410Y5FQDBVRQ1 | Texas Instruments | 12V to 5V buck converter | ~$0.6903 |
| D1, D2 | 2 | 20V 1A Schottky diode | SOT-23 | PMEG2010AET | Nexperia* | Hold-up / power path Schottky diodes | N/A |
| Q2 | 1 | N-channel MOSFET, 30V | SOT-23-3 | AO3400A | Alpha & Omega Semiconductor Inc. | Relay low-side driver | ~$0.0225 |
| LED1 | 1 | Green LED, 573nm | 0603 / 1608 Metric | 150060VS55040 | Würth Elektronik | Power/status indicator LED | ~$0.0981 |
| LED2 | 1 | Green LED, 565nm | 0603 / 1608 Metric | SML-D13FWT86C | Rohm Semiconductor | Status indicator LED | ~$0.0609 |
| RT1 | 1 | 10kΩ NTC, B=3950 | 0603* | KNTC0603/10KF3950 | KUU | Temperature sensor / compensation thermistor | ~$0.0234 |
Connectors, Switches, Relay, Protection, and Power Module
Table
| Designator(s) | Qty | Value | Package | MPN | Manufacturer | Description / Role | Est. Unit |
|---|---|---|---|---|---|---|---|
| F1 | 1 | 2A, 250VAC fast fuse | FUSE-SMD_L6.1-W2.6 | 24F 2A250V | xcfuse(旭程) | Mains input fuse | ~$0.0731 |
| MOV1 | 1 | 470V MOV, 14mm | Radial, P=7.5mm | MOV-14D471K | Bourns | L-N surge suppression varistor | ~$0.1015 |
| J1 | 1 | 3-pin 5mm terminal block | Through-hole screw terminal | DB126V-5.0-3P-GN | DIBO | 240VAC L/N/PE mains input connector | ~$0.1006 |
| J4, J6 | 2 | 2-pin 5.08mm terminal block | Through-hole, 45°/135° | 236-102 | WAGO* | Mains switched output connectors | ~$0.8496 |
| J5 | 1 | 1x6, 2.54mm pin header | Through-hole | PRPC006SAAN-RC | Sullins Connector Solutions | Programming connector | N/A |
| SW1, SW2 | 2 | SPST tactile switch | SW-SMD_L3.9-W3.0-P4.45 | TS-1088-AR02016 | XUNPU(讯普) | User input buttons | ~$0.0556 |
| K1 | 1 | 12V DPST relay | OMRON G2RL footprint | G2RL-2A-DC12 | Omron Electronics | Mains load switching relay | N/A |
| PS2 | 1 | 12V 500mA AC/DC module | Enclosed module | RACM06E-12SK/277 | RECOM Power | 80–305VAC input to 12V isolated supply | ~$8.45 |
Notes / Data Quality Flags
- Several generic passives expose grouped pricing under generic MPNs; exact per-value distributor pricing should be refreshed before purchasing.
- Some manufacturer fields in the project appear to contain datasheet/source URLs rather than manufacturer names, especially WAGO connector metadata; corrected names are noted with an asterisk where inferred.
- The BOM tool reported no usable distributor pricing for U1, U2, U3, D1/D2, J5, and K1 in the current dataset.
- Safety-critical mains parts should be reviewed against Australian compliance requirements, creepage/clearance, relay approvals, fuse characteristics, and enclosure/IP67 assembly constraints before release.
Cost Summary
Resistors
Capacitors and Inductors
Semiconductors, ICs, Optoelectronics, and Sensors
Connectors, Switches, Relay, Protection, and Power Module
Notes / Data Quality Flags
