document no. 008-0353-0 page 1- 3 rev. b www.ctscorp.com tf20 series tuning fork crystal features ? 32.7680 khz frequency reference ? package size 2.0mm x 1.2mm ? tuning fork crystal design ? hermetic ceramic package ? frequency tolerance, 20 ppm standard [10 ppm, 30 ppm and 50 ppm available] ? frequency temperature coefficient, -0.030ppm/c 2 ? operating temperature, -40c to +85c standard ? tape & reel packaging, eai-481-2 ? rohs/green compliant (6/6) applications the tf20 crystal series is ideal for use in a wide range of communication equipment, measurement equipment, industrial applications, au tomotive electronics, wireless communications, pdas, mobile phones and notebooks. ordering information example part numbers: t f202p32k7680 t f202j32k7680 20 = 2.0mm x 1.2mm k - indicates khz and decimal point. 1 contact your local cts representative or cts customer service for availability. frequency tolerance @ 25c load capacitance 1] frequency is recorded with two leading digits before the ?k? and 4 significant digits after the ?k? (including zeros). not all performance combinations and frequencies may be available. p = 12.5 pf [standard] j = 9 pf 1 = 10 ppm 2 = 20 ppm [standard] 3 = 30 ppm 5 = 50 ppm 76 package size frequency in khz 80 tf 2 0 3 2 k
document no. 008-0353-0 page 2 - 3 rev. b tf20 series tuning fork crystal electrical characteristics parameter symbol conditions min typ max unit frequency f 0 32.7680 khz o p eratin g mode - - frequency tolerance @ +25c * f/f 0 - 20 - ppm frequency temperature coefficient f/ f m - fre q uenc y stabilit y operating temperature range t a -40 - +85 c turnover temperature t m 5c - +25 - c load capacitance * c l standard - 12.5 - pf aging f/f 0 @+25c, 1st year - - 3.0 ppm drive level dl - 0.1 0.5 w shunt capacitance c 0 @1 mhz - - 7.0 pf motional capacitance c 1 -7.0-ff series resistance r 1 --90k ohms insulation resistance r i +100vdc 15vdc 500 - - m ohms storage temperature range t str -55 - +125 c * see ordering information for available options. flexural mode [tuning fork] -0.030 0.01ppm/c 2 see figure 1 electrical parameters packaging information per standard eia-418. device quantity is 3,000 pieces per 180mm reel. direction of feed 1.45 2.25 8.0 4.0 dimensions in millimeters 4.0 ?1.50 1.75 0.8 figure 1 parabolic temperature curve -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -40-30-20-10 0 102030405060708090 temperature [c] f/f [ppm] frequency stability [ppm] is determined using parabolic curve, f = temperature coefficent(t a -t m ) 2 . ex. find frequency stability at t a = 45c f = -0.030(45-25) 2 f = -0.030(20) 2 f = -12.0 ppm ?21.4 ?180 ?60 9.0 120 ?13.5 2.0
document no. 008-0353-0 page 3 - 3 rev. b tf20 series tuning fork crystal mechanical specifications suggested solder pad geometry (0.6) 0.024 (0.6) 0.024 (1.1) 0.043 0.031 (0.8) key: (mm) inch tf20 package drawing t f20d marking information 1. tf20 - cts model series. 2. d ? date code. see table i for codes. table i ? date code 2001 2005 2009 2013 2017 a b c d e f g h j k l m 2002 2006 2010 2014 2018 n p q r s t u v w x y z 2003 2007 2011 2015 2019 a b c d e f g h j k l m 2004 2008 2012 2016 2020 n p q r s t u v w x y z month jan feb mar dec year aug sep oct nov apr may jun jul notes 1. complete cts part number, frequency value, date code and manufacturing site code information must appear on reel and carton labels. 2. termination pads (e4); barrier plating is nickel [ni] with gold [au] flash plate. 3. reflow conditions per jedec j-std-020; 260c maximum, 20 seconds. 4. msl = 1.
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