Crystal Units AT-51 / AT-51CD2 For OA / AV n Features A highly stable and reliable crystal unit with a metallic package, also suitable for surface mounting. lWith many standard frequencies available, this unit is ideal for a variety of applications. lCompatible with surface mounting. lAirtight metal package ensures high-reliability. lAT-51CD2 meets the requirements for re-flow profiling using lead-free solder. AT-51 AT-51CD2 Pb Free n Specifications Model Item Frequency Range AT-51 / AT-51CD2 3.1875 to 28.63636MHz Overtone Order 26 to 75MHz Fundamental 3rd overtone Frequency Tolerance (25 ±3℃) ±20 × 10−6 Temperature Characteristics (with reference to +25°C) ±30 × 10−6 Operating Temperature Range −10 to +70℃ Equivalent Series Resistance Refer to *1 and *2 Drive Level Refer to *3 (Max:1000μW) Load Capacitance 16pF Series resonance n How to Specify an Order When ordering our products, specify them with an “Ordering Code” that consists of the following : Example AT-51-4.000-STD-PFV-2 Model name - Frequency (Max : 9 digits) M - Number for specifying an order 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 3.7max 0.65±0.1 5.5±0.3 5.08 3.5 to 20±1 max 10.1max AT-51CD2 mm φ0.43+0.05 -0.03 4.65max 11.4 ±0.2 4.88±0.2 *1 Equivalent Series Resistance (Fundamental) Overtone Order Fundamental mm Reference land pattern 6.0 2.0 11.05max 12.4 ±0.3 4.7 ±0.1 4.88±0.20 connections 0 to 0.3max 10.1max AT-51 9.0 *2 Equivalent Series Resistance (3rd overtone) Frequency (MHz) (Range) Equivalent Series Resistance max.[Ω] 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 Frequency (MHz) (Range) Equivalent Series Resistance max.[Ω] 26 to 35 35 to 48 48 to 75 140 100 80 Frequency (MHz) (Range) Drive Level(μW) 3.1875 to 3.541 3.541 to 28.63636 26 to 60 60 to 75 500 50 500 10 *3 Drive Level Overtone Order Fundamental 3rd overtone cu39_071108_AT-51_e1