AT-51CD2

Crystal Units
AT-51 / AT-51AD / AT-51CD / AT-51CD2
For Automotive
■ Features
d
En
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.
●Highly reliable under severe environmental conditions in terms of
stable start-up characteristics, heat and heat-cycle resistance and
vibration resistance.
●A surface-mount crystal unit that due to the resin seating attached
to the AT-51 type crystal unit maintains high-level electrical
characteristics and reliability.
●AT-51AD, AT-51CD and AT-51CD2 meet the requirements for reflow profiling using lead-free solder.
●AT-51CD2 meets the requirements for re-flow profiling using leadfree solder.
AT-51
AT-51AD
AT-51CD2
AT-51CD
■ Specifications
Model
Item
Nominal frequency
AT-51 / AT-51AD / AT-51CD / AT-51CD2
4 to 25 MHz
Overtone order
Fundamental
±50 × 10−6
±150 × 10−6
7
fe 1
Li 20
of arM
Frequency tolerance (25 ±3 °C)
Frequency versus temperature characteristics (with reference to +25 °C)
Operating temperature range
−40 to +125 °C
Storage temperature range
−40 to +125 °C
Equivalent series resistance
Level of drive
Refer to *1
50 μW (Max. 1000 μW)
Load capacitance
16 pF
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.
■ 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/).
mm
AT-51AD
AT-51CD
Terminal land connections
(TOP VIEW)
5.0max
11.5max
4.88±0.20
11.05max
6.8±0.3
9.0±0.3
2.0±0.2
Land pattern (Typical)
2.4
2.2
5.08±0.2
2.0±0.2
Land pattern (Typical)
3.5
4.4
1.2±0.1
3.5 to 20±1
6.8±0.3
5.08
max
11.5max
φ0.43 +0.05
-0.03
mm
Terminal land connections
(TOP VIEW)
1.5
mm
10.1max
5.2 max
AT-51
1.0±0.2
■ Dimensions
1.0±0.2
1.2±0.2
5.08
10
4.65max
150
4.5 to 6
120
6 to 8
80
8 to 10
70
10 to 25
50
12.4 ±0.3
11.4 ±0.2
Land pattern (Typical)
6.0
2.0
4 to 4.5
mm
0 to 0.3max
3.7max
Equivalent Series
Resistance max. [Ω]
4.7 ±0.1
Nominal frequency (MHz)
0.65±0.1 5.5±0.3
*1 Equivalent Series Resistance
Terminal land connections
(TOP VIEW)
10.1max
AT-51CD2
4.88±0.2
9.0
cu51_110916_AT-51_e
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