STMicroelectronics SMA428A Technical data

• 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

SMA428A

High Gain, Low Noise Amplifier

PRELIMINARY DATA

SOT323-6L (SC70)

ORDER CODE

SMA428ATR

BLOCK DIAGRAM

Vcc, 1

BRANDING

TBD

DESCRIPTION

GS, 4

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

In, 6

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 hou se d in ul tra miniature S OT323-6L

GND, 2;5

package(LEAD FREE), the relative dimensions are

1.15mmx1.8mm with 0.8mm thickness.

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

cc

V

out

V

GS

I

tot

I

in

P

tot

P

IN

T

op

T

stg

T

j

Device voltage 4 V
Voltage at pin Out 4 V
Voltage at pin GS 3.5 V
Total Device Current 12 mA
Current into pin In 0.5 mA

Total dissipation, Ts < 125 oC
Input Power 8 dBm
Operating temperature -40 to +85

Storage temperature -65 to +150
Max. operating junction temperature 150

60 mW

Out, 3

o

C

o

C

o

C

THERMAL RESISTANCE

R

thjs

March, 10 2003

Thermal Resistance Junction soldering point 200

o

C/W

1/8

SMA428A

Test Circuit (Fig. 1)

Typical application circuit (Fig. 2)

V

V

CTRL

CTRL

3 kΩ

3 kΩ

100 pF

RF in

RF in

100 pF

GS

GS

In

In

Vcc

Vcc

SMA428A

SMA428A

GND

GND

Out

Out

180 pF47 pF

180 pF47 pF

6.8 nH

6.8 nH

0.5 pF

0.5 pF

Supply

Supply

RF Out

RF Out

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SMA428A

ELECTRICAL CHARACTERISTICS

(Ta = +25

Symbol Parameters Test Conditions Min Typ Max Unit

P

o

C, VCC = 2.7V, tested in circuit shown in fig.1, unless otherwise specified)

f Frequency Range 1850 MHz

I

Gp
NF

-1dB

IIP3 Input third order intercept point -13 dBm
L

I

CTR

Total device current 5.9 7.5 mA

tot

Power Gain 18 21 dB
Noise Figure (Zs = 50 Ω)

Input Power at 1 dB Gain Compression -23 dBm

Insertion Loss in Gain-Step-Mode

GS

Current consumption in Gain-Step-Mode

Vcc = 0.0 V, V

R

CTRL

Vcc = 0.0 V, V

R

CTRL

CTRL

= 3 kΩ

CTRL

= 3 kΩ

= 2.7 V,

= 2.7 V,

1.3 1.7 dB

11 18 dB

0.33 mA

PIN CONNECTION

(Top View)

1

2

3

6

5

4

(Botto m View)

6

5

4

Pin No. Pin Name

1

2

3

1VCC
2GND
3OUTPUT
4GS
5GND
6INPUT

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