AT-51

Crystal Units AT-51 / AT-51AD / AT-51CD / AT-51CD2 n Features 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. lHighly reliable under severe environmental conditions in terms of stable start-up characteristics, heat and heat-cycle resistance and vibration resistance. lA surface-mount crystal unit that due to the resin seating attached to the AT-51 type lcrystal unit maintains high-level electrical characteristics and reliability. lAT-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. AT-51 AT-51AD For Car Electronics Pb Free AT-51CD AT-51CD2 n Specifications Item Model AT-51 / AT-51AD / AT-51CD / AT-51CD2 4 to 25 MHz Fundamental ±50 × 10−6 ±150 × 10−6 -40 to +125℃ Refer to *1 50μW(Max:1000μW) 16pF Frequency Range Overtone Order Frequency Tolerance (25 ±3℃) Temperature Characteristics (with reference to +25°C) Operating Temperature Range Equivalent Series Resistance Drive Level Load Capacitance 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 sales with your enquiries. n How to Specify an Order When ordering our products, specify them with an “Ordering Code” that consists of the following : Model name - Frequency (Max : 9 digits) M - Number for specifying an order Example AT-51-4.000M-STD-PFE-2 If you have any queries concerning our standard frequencies and numbers for specifying orders, please contact our sales representatives or visit our homepage (http://www.ndk.com/). n Dimensions AT-51 10.1max mm AT-51AD 5.2 max connections mm AT-51CD 5.0 max connections mm 11.5max 11.5max 6.8±0.3 Reference land pattern 2.4 2.2 4.4 1.0±0.2 5.08 max 3.5 to 20±1 6.8±0.3 5.08±0.2 1.2±0.1 2.0±0.2 9.0±0.3 2.0±0.2 Reference land pattern 3.5 1.5 10 φ0.43+0.05 -0.03 4.88±0.20 11.05max 4.65max 1.0±0.2 5.08 1.2±0.2 AT-51CD2 3.7max 10.1max mm connections 0.65±0.1 Frequency (MHz) (Range) 4 to 4.5 4.5 to 6 6 to 8 8 to 10 10 to 25 Equivalent Series Resistance max.[Ω] 150 4.7 ±0.1 5.5±0.3 *1 Equivalent Series Resistance 12.4 ±0.3 11.4 ±0.2 0 to 0.3max Reference land pattern 6.0 2.0 120 80 70 50 4.88±0.2 9.0 cu40_071108_AT-51_e1