Crystal Units AT-51 / AT-51CD2 For OA / AV ■ Features A highly stable and reliable crystal unit with a metallic package, also suitable for surface mounting. ● With many standard frequencies available, this unit is ideal for a variety of applications. ● Compatible with surface mounting. ● Airtight metal package ensures high-reliability. AT-51 ● AT-51CD2 meets the requirements for re-flow profiling using lead- AT-51CD2 free solder. d En ■ Specifications Model Item Nominal frequency AT-51 / AT-51CD2 3.1875 to 28.63636 MHz 26 to 75 MHz Fundamental 3rd overtone Overtone order Frequency tolerance (25 ±3 °C) ±20 × 10−6 Frequency versus temperature characteristics (with reference to +25 °C) ±30 × 10−6 Operating temperature range −10 to +70 °C −40 to +85 °C Equivalent series resistance Refer to *1 and *2 Level of drive 7 fe 1 Li 20 of arM Storage temperature range Refer to *3 (Max. 1000 μW) Load capacitance 16 pF Series resonance ■ 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-PFV-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/). 10.1max 0.65±0.1 4.88±0.20 11.05max 12.4 ±0.3 11.4 ±0.2 4.65max 6.0 9.0 4.88±0.2 *1 Equivalent Series Resistance (Fundamental) mm Land pattern (Typical) 4.7 ±0.1 φ0.43 +0.05 -0.03 Terminal land connections (TOP VIEW) 2.0 AT-51CD2 5.5±0.3 5.08 3.5 to 20±1 max mm 0 to 0.3max 10.1max AT-51 3.7max ■ Dimensions *2 Equivalent Series Resistance (3rd overtone) Overtone Order Nominal frequency (MHz) Equivalent Series Resistance max. [Ω] Fundamental 3.1875 to 3.2 3.2 to 3.5 3.5 to 3.8 3.8 to 4.2 4.2 to 4.883 4.883 to 5.2 5.2 to 5.7 5.7 to 6.6 6.6 to 6.8 6.8 to 8.3 8.3 to 10.7 10.7 to 12.2 12.2 to 15 15 to 28.63636 400 200 140 120 100 80 70 60 55 50 45 40 35 30 Overtone Order 3rd overtone Nominal frequency (MHz) Equivalent Series Resistance max. [Ω] 26 to 35 140 35 to 48 100 48 to 75 80 Nominal frequency (MHz) Drive Level (μW) 3.1875 to 3.541 500 *3 Drive Level Overtone Order Fundamental 3rd overtone 3.541 to 28.63636 50 26 to 60 500 60 to 75 10 cu50_110916_AT-51_e