www.DataSheet4U.com UM-1 and UM-5 Crystals The UM series of miniature resistance weld crystals are suitable for applications where tight specs, small footprint, and wide frequency range is important. UM-1 00.0000 MHz (customer specified frequency) UM-1-R 00.0000 MHz (RoHS Compliant and customer specified frequency) Electrical/Environmental Specifications See page 2 for gull wing configuration. UM-5 00.0000 MHz (customer specified frequency) UM-5-R 00.0000 MHz (RoHS Compliant and customer spe.