C0G/NP0 stable capacitance in the smallest commercial case size
The EMK042CG680JC-W is a 68 pF C0G/NP0 MLCC rated 16V, packaged in the 01005 (0402 metric) case — 0.40 mm × 0.20 mm with a maximum thickness of 0.22 mm. That makes this class the default choice for timing circuits, RF filters, and any design where capacitor value must hold stable across temperature — unlike X7R or Y5V dielectrics that shift by tens of percent over the same range.
The 01005 footprint is the limiting factor in BOM decisions
The 01005 case is the smallest standard surface-mount package in commercial production. At 0.40 mm × 0.20 mm × 0.22 mm max, it demands fine-pitch pick-and-place tooling and a compatible nozzle — standard 0402 nozzles will not seal correctly. The 0.22 mm max thickness also limits how this part sits relative to nearby components on a dense PCB — check the stack-up if it is placed next to any through-hole lead or tall electrolytic.
General-purpose sourcing posture for the M series
The M series from Taiyo Yuden carries Active lifecycle status — a well-supported family with multi-source availability across authorized and independent distribution. The ±5% tolerance covers general-purpose bypass and coupling roles; if your circuit requires tighter tolerance for a timing or resonant application, confirm the actual spread across the operating temperature range against the C0G/NP0 characterization curve. The Tape & Reel (TR) option is standard for production volumes; Cut Tape (CT) suits prototype quantities.