Crystal Units
AT-51 / AT-51AD / AT-51CD / AT-51CD2
■
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.
● 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 re-
flow profiling using lead-free solder.
● AT-51CD2 meets the requirements for re-flow profiling using lead-
free solder.
For Automotive
AT-51
AT-51AD
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Specifications
Item
Nominal frequency
Overtone order
Frequency tolerance (25 ±3 °C)
Operating temperature range
Storage temperature range
Equivalent series resistance
Level of drive
Load capacitance
Frequency versus temperature characteristics (with reference to +25 °C)
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.
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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
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/).
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Dimensions
AT-51
10.1max
5.2 max
11.5max
11.5max
5.08
max
6.8±0.3
3.5 to 20±1
1.2±0.1
1.0±0.2
2.2
5.08±0.2
2.0±0.2
4.88±0.20
11.05max
4.65max
4.4
φ0.43
+0.05
-0.03
1.0±0.2
5.08
1.2±0.2
10
AT-51CD2
10.1max
3.7max
Terminal land connections
(TOP VIEW)
Nominal frequency (MHz)
4 to 4.5
4.5 to 6
6 to 8
8 to 10
10 to 25
Equivalent Series
Resistance max. [Ω]
150
80
70
50
4.7 ±0.1
0.65±0.1 5.5±0.3
*1 Equivalent Series Resistance
12.4 ±0.3
11.4 ±0.2
0 to 0.3max
Land pattern (Typical)
6.0
2.0
120
4.88±0.2
9.0
cu51_110916_AT-51_e
1.5
Land pattern (Typical)
2.4
9.0±0.3
2.0±0.2
6.8±0.3
5.0max
En
mm
AT-51CD
AT-51CD2
Model
AT-51 / AT-51AD / AT-51CD / AT-51CD2
4 to 25 MHz
Fundamental
±50 × 10
−6
±150 × 10
−6
−40 to +125 °C
−40 to +125 °C
Refer to *1
16 pF
d
AT-51AD
7
fe 1
Li 0
-2
of
ar
50 μW (Max. 1000 μW)
M
Example AT-51-4.000M-STD-PFE-2
mm
AT-51CD
Terminal land connections
(TOP VIEW)
Terminal land connections
(TOP VIEW)
mm
Land pattern (Typical)
3.5
mm
MCU
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