Low Distortion Attenuator
Plastic Packaged PIN Diodes
SMP1304 Series
Features
s
Low Distortion Design
s
Frequency Range from HF to > 2 GHz
s
Designed for Base Station Applications
s
Configured for PI and TEE Attenuators
Description
The SMP1304 series of plastic packaged, surface
mountable, low capacitance (0.3 pF) silicon PIN diodes
are designed for use in attenuator applications from 5 MHz
to beyond 2 GHz. The thick 100
µm
I region of these PIN
diodes makes them very attractive for use in low distortion
PI and TEE attenuators commonly used in TV distribution
applications. The 1
µS
typical carrier lifetime of these
diodes results in resistance of 20
Ω
maximum at 1 mA and
7
Ω
maximum at 10 mA. Available in a selection of plastic
packages: as a single diode in the small footprint
SOD-323 package and in a variety of configurations in the
SOT-23 package, including a low inductance (0.4 nH)
SMP1304-007 package. Also available in the SOT-143
package are three diode junctions designed for insertion
in TEE attenuators (SMP1304-018) and PI attenuators
(SMP1304-019). Also available in a SOT-5 (SMP1304-027)
package as a four diode array designed for insertion in the
commonly used 4 diode PI attenuator circuit.
Absolute Maximum Ratings
Characteristic
Reverse Voltage (V
R
)
Power Dissipation @ 25°C Lead
Temperature (P
D
)
Storage Temperature (T
ST
)
Operating Temperature (T
OP
)
ESD Human Body Model
Value
200 V
250 mW
-65°C to +150°C
-65°C to +150°C
Class 1C
Single
Marking: PG1
SOT-23
o
SMP1304-001
Common
Cathode
Marking: PG3
SOT-23
o
SMP1304-004
Series Pair
Marking: PG2
SOT-23
o
SMP1304-005
Low
Inductance
Marking: PGB
SOT-23
o
SMP1304-007
Single
PI
Marking: PGJ
PI
Marking: PGM
SOT-5
o
SMP1304-027
SOD-323
o
SMP1304-011
SOT-143
o
SMP1304-019
L
S
= 1.5 nH
L
S
= 1.5 nH
L
S
= 1.5 nH
L
S
= 0.4 nH
L
S
= 1.5 nH
o
Available through distribution.
Alpha Industries, Inc.
[781] 935-5150
•
Fax
[617] 824-4579
•
Email
sales@alphaind.com
•
www.alphaind.com
Specifications subject to change without notice. 1/01A
1
o
Available through distribution.
Low Distortion Attenuator Plastic Packaged PIN Diodes
SMP1304 Series
Electrical Specifications at 25°C
Parameter
Reverse Current (I
R
)
Capacitance (C
T
)
Capacitance (C
T
)
Resistance (R
S
)
Resistance (R
S
)
Resistance (R
S
)
Forward Voltage (V
F
)
Carrier Lifetime (TI)
I Region Width
V
R
= 200 V
F = 1 MHz, V = 30 V
F = 1 MHz, V = 30 V
(SMP1304-018 & SMP1304-019)
F = 100 MHz, I = 1 mA
F = 100 MHz, I = 10 mA
F = 100 MHz, I = 100 mA
IF = 10 mA
IF = 10 mA
0.8
1.0
100
40
Condition
Typ.
Max.
10
0.30
0.45
50
7.0
2.0
Unit
µA
pF
pF
Ω
Ω
Ω
V
µS
µm
Typical Performance Data
10000
100
Series Resistance (Ω)
1000
100
10
1
0.1
0.01
Forward Current (mA)
10
1
.
0.1
0.1
1
10
100
0.01
400
500
600
700
800
900
1000
Forward Current (mA)
Forward Voltage (mV)
Series Resistance vs. Current @ 100 MHz
0.8
0.7
400
350
DC Characteristic
Capacitance (pF)
0.5
0.4
0.3
0.2
0.1
0
0
1
2
5
10
20
50
100
100 MHz
1 GHz
1 MHz
Conductance (µS)
0.6
300
250
200
150
100
50
0
0
500
1000
1500
10 V
40 V
0V
2000
Reverse Voltage (V)
Frequency (MHz)
Capacitance vs. Reverse Voltage
Conductance vs. Frequency
and Reverse Voltage
2
Alpha Industries, Inc.
[781] 935-5150
•
Fax
[617] 824-4579
•
Email
sales@alphaind.com
•
www.alphaind.com
Specifications subject to change without notice. 1/01A
Low Distortion Attenuator Plastic Packaged PIN Diodes
SMP1304 Series
Resistance vs. Temperature @ 100 MHz
I
F
(mA)
0.02
0.10
0.30
1.00
10.00
20.00
100.00
R
-55°C
Ω
(Ω)
1590.0
315.0
108.0
34.5
4.8
3.0
1.3
R
-15°C
Ω
(Ω)
1660.0
340.0
118.0
37.9
5.3
3.3
1.4
R
+25°C
Ω
(Ω)
1752.0
367.0
128.0
41.6
5.8
3.6
1.5
R
+65°C
Ω
(Ω)
1770.0
396.0
141.0
46.3
6.6
4.1
1.7
R
+100°C
Ω
(Ω)
1760.0
409.0
147.0
48.8
7.0
4.3
1.8
SMP1304-019 PI Attenuator PIN Diodes
The SMP1304-019 employ three PIN diode junctions in
a SOT-143 package. They are configured for ease of
insertion in PI attenuator circuits commonly used from 10
MHz to beyond 1 GHz. The SMP1304 PIN diode junction
was designed for low capacitance, wide resistance
dynamic range and low distortion performance.
3
1
4
3
SMP1304-007
In the -007 configuration of the SOT-23 package, the
package inductance is effectively reduced to 0.4 nH, in
comparison to the 1.5 nH value of the standard
configuration. This lower inductance will be particularly
beneficial when the diodes are used as shunt connected
switches at frequencies higher than 500 MHz, where
inductance is the primary limitation on maximum switch
isolation.
To achieve the effective 0.4 nH, the SOT-23 package must
be inserted in the microstrip circuit board with a gap in the
trace, as shown in the figure. Because of the polarity of
the diode junction, this low inductance feature is only
realizable with the cathode connected to ground.
Gap
2
4
1
2
SMP1304-019 (PI)
Ground
Alpha Industries, Inc.
[781] 935-5150
•
Fax
[617] 824-4579
•
Email
sales@alphaind.com
•
www.alphaind.com
Specifications subject to change without notice. 1/01A
3
Low Distortion Attenuator Plastic Packaged PIN Diodes
SMP1304 Series
SOT-23
0.110 (2.80 mm) MIN.
0.120 (3.04 mm) MAX.
3
SOD-323
0.012 (0.30 mm) MIN.
0.020 (0.50 mm) MAX.
0.047 (1.20 mm) MIN.
0.055 (1.40 mm) MAX.
1
2
0.090 (2.30 mm) MIN.
0.108 (2.74 mm) MAX.
0.010
(0.25 mm) MIN.
0.016
(0.40 mm) MAX.
0.063 (1.60 mm) MIN.
0.071 (1.80 mm) MAX.
0.083 (2.10 mm) MIN.
0.104 (2.64 mm) MAX.
0.045 (1.15 mm) MIN.
0.053 (1.35 mm) MAX.
1
2
0.037 (0.95 mm) REF.
0.020 (0.51 mm) REF.
0.076 (1.92 mm) REF.
CATHODE
INDICATOR
0.008 (0.20 mm) NOM.
0.003 (0.080 mm) MIN.
0.008 (0.20 mm) MAX.
8˚ MAX.
0.035 (0.89 mm) MIN.
0.044 (1.12 mm) MAX.
0.006
(0.15 mm) TYP.
0.050
(1.25 mm) MAX.
0.004 (0.10 mm) MAX.
0.022 (0.55 mm) REF.
0.0005 (0.01 mm) MIN.
0.004 (0.10 mm) MAX.
0.010 (0.25 mm) MIN.
SOT-143
0.110 (2.80 mm) MIN.
0.120 (3.04 mm) MAX.
0.020 (0.50 mm) REF.
4
0.083 (2.10 mm) MIN.
0.104 (2.64 mm) MAX.
1
0.068 (1.72 mm) REF.
0.028 (0.70 mm) REF.
0.030 (0.76 mm) MIN.
0.035 (0.89 mm) MAX.
0.047 (1.20 mm) MIN.
0.055 (1.40 mm) MAX.
8˚ MAX.
0.003 (0.08 mm) MIN.
0.008 (0.20 mm) MAX.
0.031 (0.80 mm) MIN.
0.047 (1.20 mm) MAX.
0.012 (0.30 mm) MIN.
0.020 (0.50 mm) MAX.
2
3
0.076 (1.92 mm) REF.
SOT-5
0.074
(1.90 mm)
REF.
5
4
0.069
(1.75 mm)
0.052
(1.30 mm)
3
0.037 (0.95 mm) REF.
0.012 (0.30 mm) TYP.
0.024
(0.61 mm)
0.004
(0.10 mm)
0.118
(3.00 mm)
0.087
(2.20 mm)
1
0.020 (0.51 mm)
0.014 (0.35 mm)
0.012
(0.30 mm)
0.000
(0.00 mm)
MIN.
0.064 (1.63 mm)
0.035 (0.90 mm)
2
0.022 (0.55 mm) REF.
0.0005 (0.01 mm) MIN.
0.004 (0.15 mm) MAX.
0.122 (3.10 mm)
0.106 (2.70 mm)
0.0104 (0.26 mm)
0.0035 (0.09 mm) MIN.
4
Alpha Industries, Inc.
[781] 935-5150
•
Fax
[617] 824-4579
•
Email
sales@alphaind.com
•
www.alphaind.com
Specifications subject to change without notice. 1/01A
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