These high-end crystals are used in addition to the Ssp-t7-f crystal smart phones.

Temperature- compensated crystal and pressure-controlled temperature-compensated crystal oscillator is in the active crystal oscillator, is the highest precision, the lowest power consumption, jitter the smallest active crystal, precision is usually between the 0.5ppm to 2.0ppm range, therefore, in the temperature change in the big time, can be stable temperature control within the specified range. Although the precision is high but the temperature of the crystal current consumption is very small, commonly used mainly is 1.8v,2.8v and 3.3V, very few will go up to 5V, voltage small user experience good, take in the hand of the smartphone, finally will not because of long time running and become hot. Warm-up crystal oscillator also from the large volume of 7050mm a little smaller, reduced to 5032mm,3225mm,2520mm, until the smallest less than a 1 yuan coin thick 2016mm SMD Crystal oscillator , for mobile phone engineering and technical personnel to save a lot of internal space.
A lot of procurement and middlemen in the purchase of temperature-compensation oscillator, thought as long as the supply of a model, or one or two parameters can buy the right to the temperature of the crystal oscillator, they do not know that a model of crystal oscillator has different specifications, not casually which specifications for the application of products. In order to avoid the wrong Crystal , causing unnecessary trouble, kinlow electronic sales, before the quotation will ask some questions, understand enough information, to ensure that the buyer specifically what kind of quartz crystal oscillator. The selection of crystal oscillator and ordinary quartz crystal oscillator is not much different from the general, the customer provides a complete model, you can determine what size is, to mention as long as the purchase to confirm the accuracy, frequency and voltage requirements. Under normal circumstances, the temperature of the crystal oscillator at minus -30°c~-40°c under the low temperature environment, the time to start the vibration will not exceed 3 seconds, most of the 2m can vibrate.
to say small volume of tcxo Crystal to do the best, it is inevitable that Japan imported KDS large vacuum and Epson Epson, the two production of quartz crystal, SMD ceramic crystal oscillator, passive crystal and active crystal, precision good quality, aging rate reached ±3ppm and ±5ppm, The lifespan can reach 10 years or more. To find crystal oscillator manufacturers Jinlo electronic Small series of consulting temperature compensation crystal oscillator, more than 75% of the procurement staff are designated to these two brands. There will be asked KDS warm crystal oscillator or Epson's warm-up crystal better, the problem is not a small part of the answer, because the two crystal oscillator are the same good.
SMD Crystal Oscillator application in the most of the smart phone is the Epson Crystal Company MC-146 and Seiko Crystal oscillator ssp-t7-f Crystal , is the same kind of crystal oscillator, parameters and dimensions are the same apart from the brand. Smartphones are becoming more powerful, and the performance of quartz crystals must be equally powerful. Warm-fill crystal is often used in Beidou GPS positioning and navigation systems, satellites, wireless base stations and other high-end areas, because of its unique temperature compensation function, can be a good solution to the problem of cell phone heating and even explosion, a lot of mobile phone manufacturers aimed at this opportunity, a large number of procurement used in the smart phone terminal reference clock system.

These high-end crystals are used in addition to the Ssp-t7-f crystal smart phones.