AS-4.000-16-SMD-TR CRYSTAL 4MHZ HC49SMT 16PF SMD TR RALTRON AS-4.000-16-SMD-TR 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 130 Ohms. Compact dimensions: length 13.50mm, width 4.70mm, and height 4.60mm. Supports a temperature range of -20°C~+70°C for reliable performance. Manufactured by RALTRON with compliance to ROHS standards. Packaged as TAPE&REEL for convenience.