Crystal Units
AT-51 / AT-51AD / AT-51CD / AT-51CD2
For Car Electronics
n 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.
lHighly reliable under severe environmental conditions in terms of stable start-up
characteristics, heat and heat-cycle resistance and vibration resistance.
lA 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.
lAT-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
Pb
Free
AT-51AD
AT-51CD
AT-51CD2
n Specifications
Model
Item
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
50 μW (Max. 1000 μW)
16 pF
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.
n 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/).
n Dimensions
mm
AT-51AD
11.5max
11.05max
6.8±0.3
1.0±0.2
Reference land pattern
3.5
1.5
9.0±0.3
2.0±0.2
Reference land pattern
2.4
4.4
1.2±0.1
φ0.43+0.05
-0.03
2.0±0.2
2.2
3.5 to 20±1
5.08±0.2
4.88±0.20
connections
11.5max
6.8±0.3
5.08
max
mm
AT-51CD
connections
5.2 max
10.1max
5.0 max
mm
AT-51
1.0±0.2
10
1.2±0.2
5.08
4.65max
AT-51CD2
10.1max
150
4.5 to 6
120
6 to 8
80
8 to 10
70
10 to 25
50
12.4 ±0.3
Reference land pattern
11.4 ±0.2
6.0
2.0
4 to 4.5
0.65±0.1
Equivalent Series
Resistance max. [Ω]
4.7 ±0.1
Frequency Range
(MHz)
5.5±0.3
*1 Equivalent Series Resistance
mm
0 to 0.3max
3.7max
connections
4.88±0.2
9.0
cu42_080911_AT-51_e
