Crystal Units AT-51 / AT-51AD / AT-51CD / AT-51CD2 For Car Electronics 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 Pb Free AT-51AD AT-51CD AT-51CD2 n Specifications Model Item AT-51 / AT-51AD / AT-51CD / AT-51CD2 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 4 to 25 MHz Fundamental ±50 × 10−6 ±150 × 10−6 -40 to +125℃ Refer to *1 50μW(Max:1000μW) 16pF 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-51AD 5.2 max connections mm AT-51CD 11.05max 6.8±0.3 1.0±0.2 9.0±0.3 2.0±0.2 Reference land pattern 2.4 Reference land pattern 3.5 4.4 1.2±0.1 2.0±0.2 2.2 3.5 to 20±1 5.08±0.2 φ0.43+0.05 -0.03 mm 11.5max 6.8±0.3 5.08 max 11.5max 4.88±0.20 connections 1.5 mm 10.1max 5.0 max AT-51 1.0±0.2 10 1.2±0.2 5.08 4.65max AT-51CD2 120 6 to 8 80 8 to 10 70 10 to 25 50 12.4 ±0.3 Reference land pattern 11.4 ±0.2 6.0 2.0 4.5 to 6 5.5±0.3 150 0.65±0.1 4 to 4.5 4.7 ±0.1 Equivalent Series Resistance max.[Ω] 0 to 0.3max 3.7max connections *1 Equivalent Series Resistance Frequency (MHz) (Range) mm 10.1max 4.88±0.2 9.0 cu40_071108_AT-51_e1