AT-51

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
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