Crystal Units
AT-51 / AT-51AD / AT-51CD / AT-51CD2
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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.
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Highly reliable under severe environmental conditions in terms of stable start-up
characteristics, heat and heat-cycle resistance and vibration resistance.
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A surface-mount crystal unit that due to the resin seating attached to the AT-51 type
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crystal unit maintains high-level electrical characteristics and reliability.
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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.
AT-51
AT-51AD
For Car Electronics
Pb
Free
AT-51CD
AT-51CD2
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Specifications
Item
Model
AT-51 / AT-51AD / AT-51CD / AT-51CD2
4 to 25 MHz
Fundamental
±50 × 10
−6
±150 × 10
−6
-40 to +125℃
Refer to *1
50μW(Max:1000μW)
16pF
Frequency Range
Overtone Order
Frequency Tolerance (25 ±3℃)
Temperature Characteristics (with reference to +25°C)
Operating Temperature Range
Equivalent Series Resistance
Drive Level
Load Capacitance
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
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/).
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Dimensions
AT-51
10.1max
mm
AT-51AD
5.2 max
connections
mm
AT-51CD
5.0 max
connections
mm
11.5max
11.5max
6.8±0.3
Reference land pattern
2.4
2.2
4.4
1.0±0.2
5.08
max
3.5 to 20±1
6.8±0.3
5.08±0.2
1.2±0.1
2.0±0.2
9.0±0.3
2.0±0.2
Reference land pattern
3.5
1.5
10
φ0.43
+0.05
-0.03
4.88±0.20
11.05max
4.65max
1.0±0.2
5.08
1.2±0.2
AT-51CD2
3.7max
10.1max
mm
connections
0.65±0.1
Frequency (MHz)
(Range)
4 to 4.5
4.5 to 6
6 to 8
8 to 10
10 to 25
Equivalent Series
Resistance max.[Ω]
150
4.7 ±0.1
5.5±0.3
*1 Equivalent Series Resistance
12.4 ±0.3
11.4 ±0.2
0 to 0.3max
Reference land pattern
6.0
2.0
120
80
70
50
4.88±0.2
9.0
cu40_071108_AT-51_e1
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