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CX MINIATURE CRYSTALS
18kHz to 600kHz MINIATURE SMD CRYSTAL
EUROQUARTZ
Telephone: +44(0)1460 230000 Fax: +44(0)1460 230001 Email: sales@euroquartz.co.uk Web: www.euroquartz.co.uk
CX-3V-SM
Page 1 of 2
General Description
The miniature CX-3V-SM crystals are leadless devices designed for surface-mounting on printed circuit boards or hybrid substrates. These crystals are intended for use in Pierce oscillators. Hermetically sealed in a rugged, miniature ceramic package the crystals are produced using a photo-lithographic process giving repeatability and consistency.

Miniature tuning fork design High shock resistance Designed for low power applications Compatible with hybrid or PCB mounting Low ageing Full military environmental testing available Ideal for battery operated applications
Specification
Frequency Range: Functional Mode: Calibration Tolerance*: Motional Resistance (R): Motional Capacitance (C): Quality Factor (Q): Shunt Capacitance (C): Drive Level: Turning Point (T)**: Temperature Coefficient: Ageing, first year: Shock***: Vibration, survival: Operating Temperature: Storage Temperature: Max. Process Temperature: 18kHz to 600kHz Tuning Fork (Flexure) A, B, or C (see below) See Figure 1 Max: 18-25kHz, 2 x typ. 25-600kHz, 2.5 x typ. See Figure 2 See Figure 3 min. is 0.25 x typ. 1.8pF max. 18-25kHz 0.5W max. 25-600kHz 1.0W max. See Figure 4 -0.035ppm/C 5ppm max. 1,500g peak, 0.3ms, 1/2 sine 10g rms 20-2,000Hz random -10~+70C (commercial) -40~+85C (industrial) -55~+125C (military) -55C~+125C 260C for 20 seconds
D
(TOP)
A D D
B
C
E
Outline CX-3V-SM Package Dimensions
Dimension Typical (mm) Maximum (mm)
A B C D E
Dimension "C"
6.73 2.62 1.27 1.32
Glass Lid (mm max.)
7.11 2.90 see below 1.52 1.57
Ceramic Lid (mm max.)
Specifications are typical at 25C unless otherwise indicated. * ** *** Closer frequency calibration available Other turning point available A higher shock and vibration version is available.
SM1 SM2 SM3
1.47 1.52 1.60
1.75 1.80 1.88
CX-3V Crystal Calibration Tolerance at 25C Equivalent Circuit
L1 R1
Calibration
Frequency Range (kHz) 18~74.9 75~169.9 170~249.9 250~600
1
C1 C0
2
A B C
0.003% 0.01% 0.1%
0.005% 0.01% 0.1%
0.01% 0.02% 0.2%
0.02% 0.05% 0.5%
L 1 Motional Inductance C 1 Motional Capacitance C0 Shunt Capacitance
R 1 Motional Resistance
CX MINIATURE CRYSTALS
18kHz to 600kHz MINIATURE SMD CRYSTAL
EUROQUARTZ
Telephone: +44(0)1460 230000 Fax: +44(0)1460 230001 Email: sales@euroquartz.co.uk Web: www.euroquartz.co.uk
CX-3V-SM
Page 2 of 2
Figure 3 - CX-3V Typical Quality Factor (Q)
300
Circuit Design
Conventional HCMOS Pierce Oscillator Circuit
RB Amplifier
200
100
in '000s
50
Buffer
20 18 50 100 200 500
C5
R)
Osc. Freq. (Fo)
Frequency
(kH z)
C
CX-2
C
Figure 4 - CX-3V Typical Turning Point Temp. (C)
+80 +70 +60 +50 +40 To(C) +30 +20 + 10
Figure 1 - CX-3V Typical Motional Resistance (R)
300 200 100 50 R1 (k
9)
20 10 5
0 - 10 -20 10 20 50 100 200 600
2 18 50 100 200 600 Frequency (kHz)
Frequency (kHz)
Figure 2 - CX-3V Typical Motional Capacitance (C)
5
Solder Pad Layout
1.78 3.05 5.46
C1 (fF)
2 1.0
0.5 18 50 100 200 600 Frequency (kHz)
Terminations
Designation Termination
Packaging
CX-1-SM - Bulk Pack (Standard) - 16mm tape, 178mm or 330mm reels (Optional) per EIA 481 - Tray Pack (Optional)
SM1 SM2 SM3
Gold Plated Nickel, Silver Plated Nickel, Solder Plated and Solder Dipped
Order Code
CX-3V
O.T.=3rd O.T. Mode Blank = Fundamental Frequency
-SM1 32.768kHz ( A
SM1 SM2 SM3 Calibration Tolerance* @ 25C A, B, C *For other calibration tolerances enter figure in ppm
/
I
)
"S" if special C = Ceramic Lid Blank = Glass Lid or custom design Blank if standard
Temperature Range: C = Commercial I = Industrial M = Military S = Specify

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