High Frequency
Surface Mount Attenuators
RFAxx Series
•
High power chip attenuators
•
Low return loss, long life and termperature stability resulting from Ni-Cr thin
film and heat conductive ceramic substrates
•
Industrial RF power sources, RF Amplifiers, radio and fixed
transmitter or mobile systems, and measurements
IRC Advanced Film Division
The RFAxx series of 50 ohm high frequency attenuators are available
in a variety of sizes and termination styles to suit applications for
mounting on heat sinks or normal PC board materials. High thermal conductivity aluminum nitride substrates
provide the low resistance thermal path for high power dissipation applications. The RFAxx series is available
with power dissipation to 30 watts when mounted to a heat sink. Frequency performance up to 4 GHz assures
proper operation in RF and microwave power amplifiers, RF transmitters and receivers and RF power sources.
Electrical Data
Model
Frequency Range
Power Rating @ 70°C
Attenuation
1
Impedance
Absolute TCR
RFA53SD
DC to 4GHz
0.25W
RFA54SD
DC to 4GHz
0.25W
RFA54DD
DC to 4GHz
0.25W
RFA55SD
DC to 4GHz
0.25W
RFA55DD
DC to 4GHz
0.25W
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40 dB
50 ±2%
±50ppm/C°
Model
Frequency Range
Power Rating @ 70°C
Attenuation
1
Impedance
Absolute TCR
Notes:
RFA84SD
DC to 1GHz
0.50W
RFA84DD
DC to 1GHz
0.50W
RFA37SD
DC to 1GHz
1.0W
RFA37DD
DC to 1GHz
1.0W
RFA68DD
DC to 1GHz
30W
2
10, 20, 30dB
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40 dB
50 ±2%
±50ppm/C°
7, 8, 9, 10dB: ±0.3dB
20, 30, 40dB: ±0.4dB
1. Attenuations tolerances as follows: 1, 2, 3, 4, 5, 6dB: ±0.2dB
2. RFA58DD rating of 30W with chip attached to proper heatsink.
General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of going to print.
46
A subsidiary of
TT electronics plc
RFAXX Series Issue October 2006 Sheet 1 of 4
© IRC Advanced Film Division
• Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Email: afdsales@irctt.com • Website: www.irctt.com
High Frequency
Surface Mount Attenuators
Surface Mount RF Power Attenuators
RFA55DD20dB Impedance
CH1
S 11
hp
IRC Advanced Film Division
RFA55DD40dB Impedance
CH1
S 11
hp
1 U FS
1:
50.178
W
6 Jul 2004 13:57:17
1.4336
W
228.16 pH
1 000. 000 000 MHz
1 U FS
1:
50.076
W
6 Jul 2004 10:02:26
1.4336
W
95.473 pF
1 000. 599 997 MHz
PRm
Cor
2: 50.141
W
2.8203
W
2 GHz
3: 50.213
W
3.8828
W
3 GHz
PRm
Cor
2: 50.617
W
-3.2188
W
2 GHz
3: 51.748
W
-4.8027
W
3 GHz
↑
1
4: 50.305
W
4.791
W
4 GHz
5: 50.563
W
5.2852
W
5 GHz
↑
1
4: 59.217
W
-6.1836
W
4 GHz
5: 55.033
W
-7.25
W
5 GHz
2
34
5
START
.030 000 MHz
STOP 6 000. 000 000 MHz
START
.030 000 MHz
STOP 6 000. 000 000 MHz
RFA55DD20dB Attenuation
RFA55DD40dB Attenuation
RFA55DD20dB VSWR
RFA55DD40dB VSWR
© IRC Advanced Film Division
• Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Email: afdsales@irctt.com • Website: www.irctt.com
47
RFAXX Series Issue October 2006 Sheet 2 of 4
High Frequency
Surface Mount Attenuators
Physical Data
RFA53SD
A
D
B
E
E
E
E
D
RFA55SD
A
B
D
RFA84SD
A
B
D
IRC Advanced Film Division
RFA37SD
A
B
C
C
C
RFA37DD
A
E
B
E
D
C
RFA54SD
A
E
D
B
E
E
D
RFA55DD
A
E
B
E
D
RFA84DD
A
B
C
C
C
C
RFA54DD
A
E
D
E
E
B
D
E
RFA68DD
A
B
C
C
Type
RFA53SD
RFA54SD
RFA54DD
RFA55SD
RFA55D
RFA84SD
RFA84DD
RFA68DD
RFA37SD
RFA37DD
A
B
C
D
E
5.00
2.70
0.70
1.20
0.80
5.00
3.80
0.70
1.20
0.80
5.00
3.80
0.70
1.20
0.80
5.00
4.50
0.70
1.20
1.00
5.00
4.50
0.70
1.20
1.00
8.00
5.25
0.70
1.40
1.10
8.00
5.25
0.70
1.40
1.10
6.70
8.65
1.05
1.00
0.80
13.00
7.00
0.70
2.00
1.40
13.00
7.00
0.70
2.00
1.40
Note: All dimensions are in mm.
© IRC Advanced Film Division
• Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Email: afdsales@irctt.com • Website: www.irctt.com
48
RFAXX Series Issue October 2006 Sheet 3 of 4
High Frequency
Surface Mount Attenuators
Environmental Data
Test Condition
Load Life
Moisture Load
Life
Solder Heat
Resistance
Solderability
1000 Hours, 70°C
1000 Hours, 40°C
95% RH
350°C, 3 sec.
235°C, 3 sec.
To meet
±1.0%
±1.0%
±1.0%
>95% coverage
0
25°
IRC Advanced Film Division
Power Derating Curve
% of Rated Power
100
60
70°
125°
Ambient Temperature (°C)
Ordering Data
Prefix
Model
RFA53SD; RFA54SD; RFA54DD; RFA55SD; RFA55DD;
RFA84SD; RFA84DD; RFA68DD; RFA37SD; RFA37DD
HFR - RFA53SD - 10dB
G
Z00
Attenuation
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40dB
Impedance Tolerance
G = ±2%
Packaging
Z00 = 100 pcs/bulk package
© IRC Advanced Film Division
• Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Email: afdsales@irctt.com • Website: www.irctt.com
49
RFAXX Series Issue October 2006 Sheet 4 of 4
