Across 12 assembled samples tested at room ambient, measured supply current clustered at ~9–11 mA, maximum stable astable frequency reached ~100 kHz under light load, and timing error stayed within ±2% versus nominal RC calculations. This snapshot frames the report purpose: to compare LM555CMM performance against published specs, reveal practical limits, and provide designers actionable guidance. The test scope included 12 samples, VCC sweeps from 4.5 V to 16 V, and three temperature points (cold, ambient, warm) in a controlled chamber. The report uses measured values, margin analysis, and rep…