A-4.000-18 CRYSTAL 4.0000MHZ 18PF TH A-4.000-18 is a high-performance crystal component that operates at a frequency of 4MHz with a frequency stability of ±50PPM.Features equivalent series resistance (ESR) of 80 Ohms. Compact dimensions: length 11.00mm, width 4.70mm, and height 13.50mm. Supports a temperature range of -20°C~+70°C for reliable performance. Manufactured by RALTRON with compliance to ROHS standards. Packaged as BULK for convenience.