1/8
PRELIMINARY DATA
March, 10 2003
SMA428A
High Gain, Low Noise Amplifier
R
thjs
Thermal Resistance Junction soldering point
200
o
C/W
Symbol
Parameter
Value
Unit
V
cc
Device voltage
4
V
V
out
Voltage at pin Out
4
V
V
GS
Voltage at pin GS
3.5
V
I
tot
Total Device Current
12
mA
I
in
Current into pin In
0.5
mA
P
tot
Total dissipation, T
s
<
125
o
C
60
mW
P
IN
Input Power
8
dBm
T
op
Operating temperature
-40 to +85
o
C
T
stg
Storage temperature
-65 to +150
o
C
T
j
Max. operating junction temperature
150
o
C
ORDER CODE
SMA428ATR
BRANDING
TBD
SOT323-6L (SC70)
HIGH GAIN Gp = 21 dB at 1.85 GHz
LOW NOISE FIGURE NF = 1.3 dB at 1.85 GHz
LOW CURRENT CONSUMPTION 5.9 mA
OPEN COLLECTOR OUTPUT
TYPICAL SUPPLY VOLTAGE: 2.4-3 V
GAIN-STEP-MODE (36dB)
ULTRA MINIATURE SOT323-6L PACKAGE (LEAD
FREE)
APPLICATIONS
LNA FOR CELLULAR MARKET (ideal for GSM900,
DCS1800 and PCS1900).
LNA FOR GPS APPLICATIONS
DESCRIPTION
High gain and low noise figures make the SMA428A an
ideal solution for Low Noise Amplifiers and receiver
front end stages up to 2.5 GHz. SMA428A's typical
supply voltage range is 2.4 to 3.3 volts. It shows
excellent performances in terms of NF, Gain and
current consumption, using just 3 external matching
components. Applying supply voltage to the GS pin and
grounding Vcc pin, it provides a reduced gain step of 35
dB. SMA428A is housed in ultra miniature SOT323-6L
package(LEAD FREE), the relative dimensions are
1.15mmx1.8mm with 0.8mm thickness.
ABSOLUTE MAXIMUM RATINGS
THERMAL RESISTANCE
In, 6
GS, 4
Vcc, 1
GND, 2;5
Out, 3
BLOCK DIAGRAM
3/8
SMA428A
ELECTRICAL CHARACTERISTICS
(Ta = +25
o
C, V
CC
= 2.7V, tested in circuit shown in fig.1, unless otherwise specified)
Symbol
Parameters
Test Conditions
Min
Typ
Max
Unit
f
Frequency Range
1850
MHz
I
tot
Total device current
5.9
7.5
mA
Gp
Power Gain
18
21
dB
NF
Noise Figure (Zs = 50
)
1.3
1.7
dB
P
-1dB
Input Power at 1 dB Gain Compression
-23
dBm
IIP3
Input third order intercept point
-13
dBm
L
GS
Insertion Loss in Gain-Step-Mode
Vcc = 0.0 V, V
CTRL
= 2.7 V,
R
CTRL
= 3 k
11
18
dB
I
CTR
Current consumption in Gain-Step-Mode
Vcc = 0.0 V, V
CTRL
= 2.7 V,
R
CTRL
= 3 k
0.33
mA
3
2
1
4
5
6
(Bottom View)
4
5
6
3
2
1
(Top View)
Pin No.
Pin Name
1
VCC
2
GND
3
OUTPUT
4
GS
5
GND
6
INPUT
PIN CONNECTION
5/8
SMA428A
Supply Current Vs Temperature
-3 0
-2 5
-2 0
-1 5
-1 0
-5
0
18 00
18 10 18 20
183 0
1 84 0
1 85 0 1 86 0
18 70
18 80 18 90
190 0
f (MHz )
Gp (dB
)
T c = 25 C
T c = -40 C
T c = 85 C
TYPICAL PERFORMANCE
Control Current Vs Temperature
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
-4 0
-25
25
50
85
T (C )
Ictr
l
(
m
A
)
OFF-Gain
(Vcc = 0V, Vctrl = 2.7V, Rctrl = 3Kohm)
-3 0
-2 8
-2 6
-2 4
-2 2
-2 0
-1 8
-1 6
-1 4
-1 2
-1 0
18 00
18 10 18 20
183 0
1 84 0
1 85 0 1 86 0
18 70
18 80 18 90
190 0
f (MHz )
Gp (dB
)
T c = 25 C
T c = -40 C
T c = 85 C
PDF 
ZIP
