quartz crystal units at-51 / at-51ad / at-51cd / at-51cd2 for automotive cu47_091009_at-51_e nominal frequency (mhz) 4 to 4.5 4.5 to 6 6 to 8 8 to 10 10 to 25 equivalent series resistance max. [] 150 120 80 70 50 *1 equivalent series resistance at-51 at-51ad at-51cd at-51cd2 pb free n specifications n features when ordering our products, specify them with an ordering code that consists of the following : -- m if you have any queries concerning our standard frequencies and numbers for specifying orders, please contact our sales represe ntatives or visit our homepage (http://www.ndk.com/). model name frequency (max : 9 digits) number for specifying an order n how to specify an order example at-51-4.000m-std-pfe-2 n dimensions the above specifications are standard for this ndk product. custom-made specifications such as load capacitance and temperature characteristics are also available. please contact ndk sale s with your enquiries. a crystal unit, ideally suited for the clock signal generating source of the cpus for power trains and safety control devices, requiring extremity high reliability as part of an automobile s electronics system. highly reliable under severe environmental conditions in terms of stable start-up characteristics, heat and heat-cycle resistance and vibration resistance. a surface-mount crystal unit that due to the resin seating attached to the at-51 type crystal unit maintains high-level electrical characteristics and reliability. at-51ad, at-51cd and at-51cd2 meet the requirements for re-flow profiling using lead-free solder. at-51cd2 meets the requirements for re-flow profiling using lead-free solder. l l l nominal frequency overtone order frequency tolerance (25 3 ) frequency versus temperature characteristics (with reference to +25 c) operating temperature range storage temperature range equivalent series resistance level of drive load capacitance 4 to 25 mhz fundamental 50 10 ?6 150 10 ?6 ?40 to +125 ?40 to +125 refer to *1 50 w (max. 1000 w) 16 pf item model at-51 / at-51ad / at-51cd / at-51cd2 mm at-51 5.08 max 3.5 to 201 0.43 +0.05 -0.03 4.880.20 11.05max 10.1max 4.65max mm at-51ad 11.5max 5.2 max 6.80.3 5.080.2 2.00.2 1.00.2 1.20.1 2.4 5.08 4.4 2.2 land pattern (typical) terminal land connections (top view) 11.5max 5.0max 6.80.3 2.00.2 1.20.2 1.00.2 9.00.3 3.5 10 1.5 mm at-51cd land pattern (typical) terminal land connections (top view) mm at-51cd2 10.1max 3.7max 0 to 0.3max 5.50.3 0.650.1 4.880.2 4.7 0.1 12.4 0.3 11.4 0.2 6.0 2.0 9.0 land pattern (typical) terminal land connections (top view)
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