PLETRONICS Crystal Selection Guide RoHS 6/6 Compliant LOWEST COST SOLUTIONS Package Series CERAMIC METAL SMD THRU-HOLE MP49 RoHS 6/6 Compliant Frequency Range Package Size 1.8 MHz—210 MHz Lowest cost thru-hole package 3rd and 5th overtones available 4.47 x 10.8 x 13.21h mm LP21 LP24 LP49 3.2 MHz—70 MHz Leaded version of the SM25, SM30, SM42 3rd overtone available UM1 UM4 UM5 10 MHz—150 MHz 3rd and 5th overtones available Gull wing available SM25 SM30 SM42 3.0 MHz—70 MHz Lowest cost metal surface mount package Rugged reliable package Lowest frequencies not available in minimum height package SM10T 12MHz—67.5MHz Lowest cost ceramic surface mount package Fundamental SM11T LP21: 4.47 x 10.8 x 2.1h mm LP24: 4.47 x 10.8 x 2.5h mm LP49: 4.47 x 10.8 x 3.56h mm UM1: 3.2 x 9.0 x 8.1h mm UM4: 3.2 x 9.0 x 4.8h mm UM5: 3.2 x 9.0 x 6.0h mm SM25: 5.0 max x 13.5 max x 2.9h mm SM30: 5.0 max x 13.5 max x 3.5h mm SM42: 5.0 max x 13.5 max x 4.6h mm 12 MHz—300 MHz Fundamental, 3rd and 5th overtone 2.5 x 3.2 x .7h mm 3.2 x 5.0 x .85h mm WATCH CRYSTALS 32.768 KHz CRYSTALS SM20S Lowest cost surface mount package 4 pad plastic SMD 12.5 and 6 pF available 3.8 x 8.5 x 2.5h mm SM13S 2 pad plastic SMD 1.5 x 7.0 x 1.4h mm SM8S 2 pad ceramic SMD 1.5 x 3.2 x 1.0h mm SM7S 2 pad ceramic SMD 1.2 x 2.0 x 0.6mm Pletronics, Inc. (425) 776-1880, Fax: (425) 776-2760, www.pletronics.com SGC001 (REV-J) PLETRONICS Crystal Selection Guide RoHS 6/6 Compliant LOW PROFILE CERAMIC SMD PACKAGES Package Tight Tolerance Solutions Frequency Range Package Size SM7T 26 MHz—-60 MHz 1.25 x 1.6 x 0.32h mm SM8T 20 MHz—80 MHz 1.6 x 2.0 x 0.45h mm SM9T 16 MHz—80 MHz 2.0 x 2.5 x 0.55h mm SM10T * 12 MHz—67.5 MHz 2.5 x 3.2 x 0.7h mm SM11T * 12 MHz—300 MHz 3.2 x 5.0 x 0.85h mm SM12T * 10 MHz—250 MHz 3.5 x 6.0 x 1.2h mm SM13T * 6 MHz—150 MHz 5.0 x 7.0 x 1.1h mm * These devices have been developed to be specified to very tight tolerances. KEY PARAMETERS NEEDED TO SPECIFY A CRYSTAL Cload This parameter is valid for crystals used in load or parallel resonant oscillator circuits. C load is the capacitance value, specified in pf, used during frequency calibration. e.g. 18 pf ESR (Equivalent Series Resistance): This resistance represents the equivalent impedance of the crystal at its resonant frequency and is specified in Ohms. e.g. 50 ohms max Overtone: Crystals have sharp resonant peaks at their fundamental frequency and at odd harmonics above the fundamental. Crystals designed to function at one of these harmonics are called overtone crystals. At higher oscillator frequencies overtone designs reduce cost by using thicker, and easier to manufacture, crystal elements. The majority of crystals in use today are fundamental or third overtone. e.g. Fund Calibration Tolerance: This is the maximum deviation from nominal frequency at 25° C. Calibration tolerance is specified in Parts-Per-Million (ppm). e.g. ±30ppm Stability: Stability is the maximum deviation of the crystal frequency over the specified operational temperature range referenced to 25° C. Like calibration tolerance, stability is specified in ppm. The combined effects of calibration tolerance and stability are additive over the operational temperature range. E.g. ±50ppm Part Number Builder: A complete guide to building a crystal part number can be found in the crystal product section at www.pletronics.com . Pletronics, Inc. (425) 776-1880, Fax: (425) 776-2760, www.pletronics.com SGC001 (REV-J)