AS-4.000-16-TR CRYSTAL 4MHZ HC49US 16pF 20PPM SHORT RALTRON AS-4.000-16-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 11.40mm, width 5.00mm, and height 3.50mm. 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.