Preliminary Data Sheet
Part Number 855745
70 MHz SAW Filter
Features
• For broadband applications
• Typical 3 dB bandwidth of 5.7 MHz
• High attenuation
• Single-ended operation
• Ceramic Surface Mount Package (SMP)
• Replaces Sawtek P/N 851553 (BW 3dB=5.5 MHz)
• Hermetic
• RoHS compliant (2002/95/EC), Pb-free
•
Package Pin Configuration
Surface Mount 19.00 x 6.50 x 1.75 mm Bottom View
10 9 8 76
5
4
3
21
Pin No. Description
5 RF output
10 RF input
1,6 Ground
2,3,4 Case ground
7,8,9 Case ground
R0.51
1.91
2.31
1.02
1.80
0.76
19.0
6.50
1.75 NOM.
1.96 MAX.
Dimensions shown are nominal in millimeters
All tolerances are ±0.15mm except overall
length and width +0.15mm/-0.10mm
Body: Al2O3 ceramic
Lid: Kovar, Ni plated
Terminations: Au plating 0.5 - 1.0µm,
over a 2 - 6µm Ni plating
Pb
Subject to change or obsolescence without notice Rev B 13-Oct-2005 Page 1 of 5
Preliminary Data Sheet
Part Number 855745
70 MHz SAW Filter
Electrical Specifications (1)
Operating Temperature Range: (2) 0 to +70 oC
Parameter (3) Minimum Typical Maximum Unit
Center Frequency - 70 - MHz
Minimum Insertion Loss - 22.2 24 dB
Lower 1 dB Bandedge (4)
Upper 1 dB Bandedge
-
72.35
67.45
72.66
67.65
-
MHz
MHz
Lower 3 dB Bandedge (4)
Upper 3 dB Bandedge
-
72.73
67.17
72.89
67.27
-
MHz
MHz
Lower 40 dB Bandedge (4)
Upper 40 dB Bandedge
66.08
-
66.28
73.76
-
73.92
MHz
MHz
Amplitude Variation
67.65 - 72.35 MHz
-
0.61
1.1
dB p-p
Phase Linearity
67.65 - 72.35 MHz
-
2.6
5.0
deg p-p
Group Delay Variation
67.65 - 72.35 MHz
-
55.7
110
nsec
Absolute Delay - 2.065 -
µsec
Relative Attenuation(4)
10 - 58 MHz
58 - 66 MHz
74 - 82 MHz
82 - 90 MHz
90 - 120 MHz
120 - 145 MHz
145 - 200 MHz
42.0
37.0
41.0
44.5
51.0
47.5
59.0
55
47
47
54
60
54
65
-
-
-
-
-
-
-
dB
dB
dB
dB
dB
dB
dB
Source Impedance: (5) - 50 -
Ω
Load Impedance: (5) - 50 -
Ω
Substrate Material - LiTaO3 - -
Temperature Coefficient of Frequency - -23 - ppm/oC
Notes:
1. All specifications are based on the matching schematic shown on page 4
2. In production, devices will be tested at room temperature to a guardbanded specification to ensure electrical compliance over
temperature
3. Electrical margin has been built into the design to account for the variations due to temperature drift and manufacturing tolerances
4. All attenuation measurements are measured relative to minimum insertion loss
5. This is the optimum impedance in order to achieve the performance shown
Subject to change or obsolescence without notice Rev B 13-Oct-2005 Page 2 of 5
Preliminary Data Sheet
Part Number 855745
70 MHz SAW Filter
Typical Performance (at +25oC)
Subject to change or obsolescence without notice Rev B 13-Oct-2005 Page 3 of 5
Preliminary Data Sheet
Part Number 855745
70 MHz SAW Filter
Matching Schematic
Actual matching values may vary due to PCB layout and parasitics
50Ω
Single-ended
1,2,3,4
6,7,8,9
50
Ω
15pF
180nH
10 5
560nH
50
Ω
10pF
Marking PCB Footprint
XXXXXX
855745
SAWTEK
Date Code
ID Dot
2.51
6.70
8.86
.69
1.22
2.00
The date code consists of: day of the current year (Julian,
3 digits), last digit of the year (1 digit) and hour (2 digits)
This footprint represents a recommendation only
Dimensions shown are nominal in millimeters
Tape and Reel
Ø1.5
12.0
2.3
4.0
0.3 2.0
0.20
Section A-A 7.1
19.6
R0.75 1.75
Ø1.5
14.2
28.4
32.0
A
A
ID dot
Direction of travel
Ø330
Ø102
2.7
Ø13.0
Ø20.2 2.0
32.8
Dimensions shown are nominal in millimeters
Packaging quantity: 2000 units/reel
Subject to change or obsolescence without notice Rev B 13-Oct-2005 Page 4 of 5
Preliminary Data Sheet
Part Number 855745
70 MHz SAW Filter
Maximum Ratings
Parameter Symbol Minimum Typical Maximum Unit
Operating Temperature Range T 0 +25 +70 oC
Storage Temperature Range Tstg -40 - +85 oC
Important Notes
Warnings
• Electrostatic Sensitive Device (ESD)
• Avoid ultrasonic exposure
RoHS Compliance
• This product complies with EU directive 2002/95/EC (RoHS)
Solderability
• Compatible with JEDEC J-STD-020C Pb-free process, 260°C peak reflow temperature (see soldering profile)
Links to Additional Technical Information
PCB Layout Tips Qualification Flowchart Soldering Profile
S-Parameters RoHS Information Other Technical Information
Sawtek’s liability is limited only to the Surface Acoustic Wave (SAW) component(s) described in this data sheet. Sawtek does not accept any liability for
applications, processes, circuits or assemblies, which are implemented using any Sawtek component described in this data sheet.
Contact Information
PO Box 609501
Orlando, FL 32860-9501
USA
Phone: +1 (407) 886-8860
Fax: +1 (407) 886-7061
Email: custservice@sawtek.com
Web: www.sawtek.com
Or contact one of our worldwide
Network of sales offices,
representatives or distributors
Pb
Subject to change or obsolescence without notice Rev B 13-Oct-2005 Page 5 of 5
