Crystal UnitsThe Characteristics and Advantages of Murata's Crystal Units

Murata's crystal units use a package structure which differs from typical crystal units. While regular crystal units use a ceramic substrate with a cavity structure, Murata's crystal units use a structure which combines a metal cap with a planar ceramic substrate, which has a ceramic resonator with a proven track record extending back many years.
Using the highly versatile planar ceramic substrate and metal cap allows us to reduce the material costs compared with conventional crystal units, achieve stable supply, and increase production.

A crystal unit is an electronic component that can generate arbitrary and stable frequencies thanks to the high Q factor of a crystal blank. However, when particles adhere to the surface of the crystal blank, this high Q factor causes a considerable increase of CI characteristics because the particles impede the vibrations of the blank attributable to the piezoelectric property of the material. The crystal unit may cease to oscillate in some cases if its CI characteristics increase and its specific CI value becomes unavailable.
Murata's unique particle screening technology is technology patented by Murata (patent number: 4998620). We apply this technology in Murata's crystal unit manufacturing process. We started mass-producing crystal units in 2009. Screening in the ppb order is possible for Murata's crystal unit in contrast to screening in the ppm order for other companies in regards to defects due to particles among the products we have shipped since introducing humidity treatment (according to our calculation).

Soldering connection resistance is sought in applications including radars, ADAS ECUs, central ECUs, engine ECUs, TPMSs, and cameras with characteristics such as severe temperature changes, heat control difficulty, and a large number of laminated boards. Murata Manufacturing's crystal units realize a high resistance to cracking that occurs during soldering (product life) of 10% or more compared to other companies with our unique structure.

Murata has been providing the IC matching service of its ceramic resonators for IC manufacturers and the manufacturers of home appliances and automotive onboard electronic components that use ICs in their products for more than 30 years. We receive hundreds of evaluation requests from our customers every month. Our service contributes to reducing the evaluation man-hours for the assembled products of our customers. We also started providing the IC matching service for our crystal units in 2008, catering to the need in the telecommunication equipment market where much higher precision of frequency control is required. Moreover, we are also enhancing our IC matching service overseas.

Since we consider it necessary to ensure the normal operation of oscillator circuits as well as the stable operation of ICs, we have established the minimum amplitude of oscillation for the low-end products that may be used as the quality standards for resonators used in the automotive electronic market, whose measurements have been reported to the customers. We usually obtain data and other information that verifies the signal quality for USB and SATA communication in addition to our IC matching data. This service contributes to reducing the evaluation man-hours for our customers. We started mass producing high precision crystal units for the RF market such as Wi-Fi® in 2014. We provide an IC matching service dedicated for devices requiring total frequency precision to be no more than ±20ppm and an EVM measurement service for Wi-Fi®.

Click the series name to see the recommended part number.

Information is also provided for products that will soon be, or have already been, discontinued.
You need to create an account with your company email address, log-in, request access to each site, and get a membership.