Inverted Mesa Crystals Blanks
SM156
30 - 250MHz 0.220 round clip mount designs
The SM156 series of electrode plated Square inverted Mesa blanks are designed to mount in standard 0.220" mounts (two or
four point mounts).
This series offers an much lower pricing than CM220 series.
XECO's proprietary process yields a mesa which is clean and free of defects, enabling high performance operation for
oscillators and filters.
Features
XECO high quality low spurs crystals
Electrodes plated to opposite corners
Electrodes in various sizes possible for frequencies and
C1/C0 ratios
Tune Low and Tune High options
High Q, chemically etched, free of etch channels
Applications
Standard 0.220 round mount applications
High performance VCXO, XO, OCXO, filters, and specials
requiring hybrid design
Telecom, communications, networking, military
Operation Mode
Fundamental or Overtone
Frequency Range
30 to 250 MHz
Frequency Tolerance
+/- 0.010 F^2 (489KHz at 156.25)
Electrode Size
Contact Sales
Electrode Style
Plated to opposite corners and opposing sides
Material and Q
Low Etch Channel Pure Z Quartz with a
Q minimum of 1.8 Million
Surface Finish
Polished
Angle
Std AT cut 35D8' to 35D29' [EFG 3D6' t
Angle Tolerance
+/- 2' or +/- 1'
Specification Note
Custom or special requirements are available
Dimensions (mm)
3.962 x 3.962 x 0.080 mm
Dimensions (inches)
0.156 x 0.156" (0.220 across diagonal) x
Ship Pack Method
Vacuum sealed wafflepack
Contact Material:
Same as Electrode or Chrome-Gold with Aluminum
Frequency Range 3Rd: 90 to 750 MHz
Electrode Material
Chrome Gold or Aluminum
Benefits:
Lower cost implementation than with round blanks
Low spurs for filter (with small electrodes and Aluminum
plating)
Fit wide range of mounts
High yield potential
Electrode Freq. Tol.:
Low Cost Inverted Mesa Crystals Blanks
RM126
50 - 700 MHz for 5 x7 mm SMD & UM-1/HC45
Device Dimensions
+0.000 -0.025
mm
+0.000 -0.025
+0.025 -0.025
+0.025 -0.025
+0.001 -0.001
+0.003 -0.003
+0.001 -0.001
+0.001 -0.001
X
1.829
Z
3.200
MX
1.524
MZ
1.524
ma
0.533
mb
0.762
mc
md
m:
tx
0.152
t:
0.838
m:
NA
arcS
NA
+0.002 -0.002
+0.013 -0.013
+0.013 -0.013
NA
NA
Tolerances
mm
+0.00 -1.00
Inches
+0.00 -1.00
+1.00 -1.00
+1.00 -1.00
+0.05 -0.05
+0.10 -0.10
+0.05 -0.05
+0.05 -0.05
+0.08 -0.08
+0.5 -0.5
+0.5 -0.5
NA
NA
Tolerances
mils (0.001")
72.00
126.00
60.00
60.00
21.00
30.00
6.00
33.00
NA
NA
X
Z
MX
MZ
ma
mb
mc
md
m:
tx
t:
m:
arcS
The Roditi International Corporation Ltd
London, England
Phone +44 20 7439 4390
Fax
+44 20 7434 0896
Email: sales@roditi.com
For more information, sales and technical support: