Data Sheet
Part Number 855271
479.75 MHz SAW Filter
Features
Usable bandwidth of 9 MHz
High attenuation
Single-ended operation at 50
Ceramic Surface Mount Package (SMP)
Small size
Package
Pin Configuration
Surface Mount 7.01 x 5.51 x 1.63 mm
Bottom View
12
11
10
4
5
6
8
9
7
3
2
1
Pin No.
Description
3
Output
9
Input
1,2,4,5,6,7
Case
Ground
8,10,11,12
Case
Ground
1.63 NOM.
1.78 MAX.
5.51
0.76
1.14
1.27
1.70
0.79
1.27
7.01
Dimensions shown are nominal in millimeters
All tolerances are
0.15mm except overall
length and width
0.13mm
Body: Al
2
O
3
ceramic
Lid: Kovar, Ni plated
Terminations: Au plating 0.5 - 1.0
m,
over a 2 - 6
m Ni plating
Subject to change or obsolescence without notice
Rev A
25-Jul-2003
Page 1 of 5
Data Sheet
Part Number 855271
479.75 MHz SAW Filter
Electrical Specifications
(1,2,3)
Parameter
(4)
Minimum
Typical
Maximum
Unit
Center Frequency
- 479.75 -
MHz
Insertion Loss
- 19.5
22
dB
3 dB Bandwidth
(5)
9
11.7
-
MHz
35 dB Bandwidth
(5)
- 19.9
22
MHz
Passband Variation
(6)
- 0.38
1
dB
p-p
Group Delay Variation
475.25 - 484.25
MHz
-
26
50
nsec
Source Impedance
(7)
- 50 -
Load Impedance
(7)
- 50 -
Temperature Coefficient
(3)
- -23 -
ppm/
o
C
Substrate Material
- LiTaO
3
- -
Notes:
1. All specifications are based on the test circuit shown below
2. This specification is valid for room temperature only
3. Device will function over an operating temperature of -40 to 85
o
C, but may not meet the above ambient specification. Insertion loss
and frequency shift performance will change over temperature. See coefficient of temperature for frequency shift estimation.
4. Electrical margin has been built into the design to account for the variations due to manufacturing tolerances
5. Referenced to insertion loss at 479.75 MHz
6. Referenced to 100% of 1dB bandwidth
7. This is the optimum impedance in order to achieve the performance shown
Test Circuit:
Actual matching values may vary due to PCB layout and parasitics
50
Single-ended
1,2,4,5,6,7
8,10,11,12
50
12pF
9
3
50
39pF
Subject to change or obsolescence without notice
Rev A
25-Jul-2003
Page 2 of 5
Data Sheet
Part Number 855271
479.75 MHz SAW Filter
Typical Performance
(at +25
o
C)
Subject to change or obsolescence without notice
Rev A
25-Jul-2003
Page 3 of 5
Data Sheet
Part Number 855271
479.75 MHz SAW Filter
Matching Schematics
Actual matching values may vary due to PCB layout and parasitics
50
Single-ended
1,2,4,5,6,7
8,10,11,12
50
12pF
9
3
50
39pF
Marking
PCB Footprint
Date code
855271
SAWTEK
ID dot
XXXXXX
5.71
.99
7.21
1.34
1.34
.99
.28
.28
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
Section A-A
0.3
2.2
7.3
5.8
1.5
8.0
4.0
2.0
A
A
1.5
16.0
7.5
1.75
ID dot
2.0
13.0
20.2
330
16.8
2.7
Direction of travel
102
Dimensions shown are nominal in millimeters
Packaging quantity: 3000 units/reel
Subject to change or obsolescence without notice
Rev A
25-Jul-2003
Page 4 of 5
Data Sheet
Part Number 855271
479.75 MHz SAW Filter
Maximum Ratings
Parameter
Symbol
Minimum
Maximum
Unit
Operating Temperature Range
T
-40
+85
o
C
Storage Temperature Range
T
stg
-40 +85
o
C
Warnings
Electrostatic Sensitive Device (ESD)
Avoid ultrasonic exposure
Links to Additional Technical Information
PCB Layout Tips
Qualification Flowchart
S-Parameters
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
Soldering Profile
Other Technical Information
Subject to change or obsolescence without notice
Rev A
25-Jul-2003
Page 5 of 5
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