7Semi PCB Ruler - Multi-Purpose Electronics Reference Tool with SMD Package Guide, Component Footprints, and Measurement Scale for PCB Design and Prototyping
PCB designers and electronics engineers frequently need to cross-reference component footprints, package sizes, pin pitches, and wire gauges during design and assembly. The 7Semi PCB Ruler consolidates all of these references onto a single, carry-ready tool, built on a durable PCB substrate that withstands regular workshop and lab use.
The ruler serves a dual role as a 0-to-15 cm measurement scale and a comprehensive component reference guide. It covers SMD resistor and capacitor sizes from 0201 to 2512, diode packages, SMD transistors, IC footprints including QFP, QFN, DFN, BGA, SSOP, SOIC, and TSSOP-64, connector footprints for JST and Qwiic, transistor and MOSFET schematic symbols, THT LED polarity markings, pin-pitch guides, and an AWG 8-to-18 wire size reference. This makes it well-suited for PCB layout work, component identification, prototyping, repair, and electronics education.
Key Features
- Measurement Scale: Built-in ruler with markings from 0 to 15 cm for quick and accurate length measurement on the workbench.
- SMD Resistor and Capacitor Sizes: Visual footprint references for 0201, 0402, 0603, 0805, 1206, 1210, 2010, and 2512 packages.
- Diode Package Reference: Includes SOD323, SOD80, SOD128, SMA, SMB, and SMC package outlines for fast identification.
- SMD Transistor Footprints: Covers SOT23 (3-pin and 5-pin), SOT89, SOT223, SOT252, and SC70 package layouts.
- MELF and Micro-MELF Packages: Reference outlines for cylindrical SMD component packages.
- IC Package Guide: Includes SSOP, SOIC, TSSOP-64, QFN, DFN, QFP (10 x 10 and 14 x 14 at 0.5 mm and 0.8 mm pitch), and BGA 15 x 15 grid footprints.
- Connector Footprints: Displays JST 1.25 mm (1 x 06) and Qwiic 1.25 mm (1 x 04) connector layouts for spacing reference.
- Transistor and MOSFET Symbols: Schematic symbols for PNP, NPN, PMOS, and NMOS devices included for quick circuit reference.
- THT LED Polarity Marking: Clear anode and cathode markings to prevent incorrect LED orientation during assembly.
- Pin Pitch and Header Guide: Helps verify pin spacing and header arrangements during prototyping and layout checks.
- AWG Wire Size Reference: Covers AWG 8 to 18 wire gauges for quick cable and wire selection.
- Compact PCB Construction: At 167 x 36 x 1.6 mm, it is slim, portable, and easy to keep alongside design tools and development boards.
Applications
- PCB layout and footprint verification during schematic-to-board design stages
- SMD component identification and package comparison during procurement and assembly
- Prototyping and breadboard work requiring quick pin-pitch and header spacing checks
- Wire selection using the AWG reference during cable harnessing and connector work
- Electronics repair and fault-finding where component package identification is needed
- Educational use in electronics courses, maker spaces, and self-directed learning for component recognition
