{"product_id":"7x9cm-double-sided-prototype-pcb-board-2-54mm-pitch-fr4-arduino-2pack","title":"7×9cm Double-Sided Prototype PCB Board — 2.54mm Pitch, 1.6mm, FR4, Arduino (2-Pack)","description":"\u003ch2\u003e7×9cm Double-Sided Prototype PCB Board — 2.54mm Pitch, 1.6mm FR4, Arduino (2-Pack)\u003c\/h2\u003e\u003cp\u003eThis 7×9cm double-sided prototype PCB provides a larger soldering area than the standard 5×7cm board, with plated through-holes connecting top and bottom copper layers at 2.54mm (0.1\") pitch. The 1.6mm FR4 fiberglass substrate and 0.95mm aperture holes accommodate standard through-hole components, DIP ICs, and Arduino-compatible headers. Ideal for larger prototype circuits, Arduino Uno\/Mega shields, and multi-module IoT boards.\u003c\/p\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBoard Size\u003c\/td\u003e\n\u003ctd\u003e7 × 9cm (70 × 90mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHole Pitch\u003c\/td\u003e\n\u003ctd\u003e2.54mm (0.1\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHole Diameter (aperture)\u003c\/td\u003e\n\u003ctd\u003e0.95mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCopper Layers\u003c\/td\u003e\n\u003ctd\u003eDouble-sided (top + bottom, plated through-holes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003eFR4 fiberglass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBoard Thickness\u003c\/td\u003e\n\u003ctd\u003e1.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCopper Finish\u003c\/td\u003e\n\u003ctd\u003eTin-plated (HASL)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003e2 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003ePrototype PCB Size Comparison\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003cth\u003eApprox. Holes\u003c\/th\u003e\n\u003cth\u003eBest For\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5×7cm\u003c\/td\u003e\n\u003ctd\u003e~513 holes\u003c\/td\u003e\n\u003ctd\u003eSmall circuits, sensor modules, NE555 builds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5×7cm double-sided\u003c\/td\u003e\n\u003ctd\u003e~513 holes (2 layers)\u003c\/td\u003e\n\u003ctd\u003eESP8266\/ESP32 breakout, Arduino Nano shield\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e7×9cm (this listing)\u003c\/td\u003e\n\u003ctd\u003e~1,000 holes (2 layers)\u003c\/td\u003e\n\u003ctd\u003eArduino UNO shield, larger IoT boards, relay boards\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e9×15cm\u003c\/td\u003e\n\u003ctd\u003e~2,100 holes\u003c\/td\u003e\n\u003ctd\u003eFull Arduino Mega shield, complex multi-module boards\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eWhy Choose 7×9cm Double-Sided PCB?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarger build area\u003c\/strong\u003e — ~1,000 holes accommodate Arduino UNO footprint (68.6×53.3mm) with room for additional components\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlated through-holes\u003c\/strong\u003e — top-to-bottom electrical connection at every hole for complex routing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.6mm FR4\u003c\/strong\u003e — standard PCB thickness, compatible with standard PCB standoffs and enclosures\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.95mm aperture\u003c\/strong\u003e — fits standard component leads (0.5–0.8mm) with good solder joint clearance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-pack value\u003c\/strong\u003e — one for the build, one for the next iteration\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatible With \/ Common Use Cases\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eArduino UNO shield\u003c\/strong\u003e: Custom sensor, relay, or display shield that fits over Arduino UNO (68.6×53.3mm footprint)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eArduino Mega breakout\u003c\/strong\u003e: Larger circuit builds requiring all Mega GPIO headers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-relay control board\u003c\/strong\u003e: 4–8 relay + ULN2003 + optocoupler circuit for home automation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower supply board\u003c\/strong\u003e: LM2596 or 7805 + filter capacitors + terminal blocks for bench supply\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSensor hub\u003c\/strong\u003e: Multiple I²C sensors (BME280, MPU-6050, DS3231) on one board with ESP32\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: Does the 7×9cm board fit an Arduino UNO shield form factor?\u003c\/strong\u003e\u003cbr\u003eA: Arduino UNO PCB is 68.6×53.3mm. A 7×9cm (70×90mm) board is slightly larger than the UNO, providing enough space for the UNO header footprint plus additional components around the edges. It is not a direct shield replacement (no pre-drilled header positions) but provides ample space for a custom UNO-compatible shield layout.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Can I cut this board to a smaller size?\u003c\/strong\u003e\u003cbr\u003eA: Yes. FR4 can be scored with a utility knife and snapped, or cut with a rotary tool (Dremel) or PCB shear. Score both sides along the cut line, then snap cleanly. Wear a dust mask when cutting FR4 — fiberglass dust is a respiratory irritant.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What solder should I use for this prototype PCB?\u003c\/strong\u003e\u003cbr\u003eA: Use 60\/40 or 63\/37 tin-lead solder (0.8mm diameter) for easiest soldering. For lead-free, use SAC305 (Sn96.5\/Ag3\/Cu0.5) with flux. Apply flux to the pad before soldering for clean, shiny joints. Avoid excessive heat — 1–2 seconds per joint at 320–350°C is sufficient.\u003c\/p\u003e\u003ch3\u003ePackage Contents\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e2× 7×9cm Double-Sided Prototype PCB Board (FR4, plated through-holes)\u003c\/li\u003e\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":46991462367467,"sku":"\u003cnone\u003e","price":17.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/7x9cm-double-sided-prototype-pcb-copper-board.webp?v=1761721304","url":"https:\/\/keszoox.com\/products\/7x9cm-double-sided-prototype-pcb-board-2-54mm-pitch-fr4-arduino-2pack","provider":"Keszoox","version":"1.0","type":"link"}