AT-CUT CRYSTAL UNIT (SMD • Plastic Package) CM309S RoHS Compliant Optional 1000pcs/reel ■FEATURES 7Embeded with heat resistant cylinder type crystal bring highly stable characteristics. 7Automatic mounting and reflowable Type. 7Suitable for various applications such as communication devices, AV devices, automotive devices and measuring instruments. Life-size ■DIMENSION [mm] ■SOLDER PAD LAYOUT [mm] 12.4±0.1 #4 Internal connection #3 #4 #3 4.3±0.3 1.8 #1 1.8 #2 #2 9.4±0.1 （1.5） 0.8 0.8 1.8 3.6±0.1 1.7 （1.5） 1.8 #1 7.6 （1.0） ∗ Do not connect to external with #2 and #3 ■STANDARD SPECIFICATIONS Model Item Nominal Frequency f0 Conditions CM309S 3.5MHz∼34.0MHz（Fundamental） 27.0MHz∼70.0MHz（3rd Overtone） Need to contact us for the available frequency Frequency Tolerance △f/f0 Frequency Tolerance over Operating Temperature Range △f/f0 Operating Temperature Range TOPR −40℃∼＋85℃ Storage Temperature Range TSTR −55℃∼＋125℃ Motional (series) resistance R1 Refer to the following table at 25˚C Load capacitance CL 16.0pF, 18.0pF Need to specify your requirement Shunt capacitance C0 7.0pF Max. Level of drive DL 100μW Max. Insulation Resistance IR 500MΩMin. DC100V±15V △f/f0 ±5ppm Max. 25℃±3℃ Aging (first year) ±30ppm at 25˚C below 6.0MHz：±50ppm −10℃∼＋60℃ above 6.0MHz：±30ppm See figure 3 in P4 ■MOTIONAL (SERIES) RESISTANCE (R1) Frequency Range Mode R1 3.5MHz≦f0＜4.0MHz 4.0MHz≦f0＜6.0MHz 6.0MHz≦f0＜10MHz 10MHz≦f0＜27MHz 27MHz≦f0＜36MHz 36MHz≦f0≦70MHz Fundamental Fundamental Fundamental Fundamental Fundamental 3rd Overtone 3rd Overtone 200ΩMax. 150ΩMax. 100ΩMax. 50ΩMax. 50ΩMax. 100ΩMax. 80ΩMax. http://www.citizen.co.jp/crystal/index.html 18