: A specific internal material or manufacturing standard code used by the fabricator. UL 94 flammability rating
| Term | Meaning | Engineering Implication | |-------|---------|--------------------------| | | Asia Pacific Circuit Board – a major Taiwanese PCB manufacturer (APCB Group) | Indicates fab source, known for automotive and industrial-grade boards. Implies specific process controls, panel sizes, and reliability history. | | M3 | Not a standard NEMA or IEC grade. Most likely: M3 grade paper phenolic (XXXPC-like) or an internal APCB material code. Alternatively, could indicate 3-layer metal core? But context suggests M3 = UL recognized FR-2 type (paper-based, high punchability) or M3 = 3 mm thickness . | Paper-based (FR-2) vs glass-epoxy (FR-4). M3 paper phenolic is cheaper, punches cleanly, but has poorer moisture resistance and thermal performance than FR-4. | | 94V-0 | UL 94 flammability rating – V-0 means burning stops within 10 seconds, no flaming drips. | Mandatory for safety in consumer electronics, power supplies, automotive. 94V-0 does not specify material class (FR-2, FR-4, CEM-1 can all be 94V-0). | | Schematic | Circuit diagram – the logical blueprint. | Without a schematic, the PCB is just copper shapes. “+schematic” implies full design documentation, netlist, BOM, and likely test points. | apcb+m3+94v0+schematic
: This stands for the manufacturer, APCB Inc. , a major Taiwan-based company specializing in Printed Circuit Board (PCB) fabrication. : A specific internal material or manufacturing standard