Page 1
• LOW NOISE FIGURE: NFmin = 1.05dB
@ 1.8GHz, 5mA, 2V
• COMPRESSION P1dB = 12.5dBm
@ 1.8GHz, 20mA, 2V
• ULTRA MINIATURE SOT343 PACKAGE
START420
NPN Silicon RF Transistor
SOT343 (SC70)
DESCRIPTION
ORDER CODE
START420TR
BRANDING
420
The START420 is a member of the START family
that provide market with the state of the art of RF
silicon process. Manufacturated in the third
generation of ST propri etary bipolar process, it
offers the best mix of gain and NF for given
breakdown voltage(BVceo).
It reaches performance level only achieved with
GaAs products before.
APPLICATIONS
• LNA FOR GSM/DCS, DECT, PDC, PCS,
PCN
• PREDRIVER FOR DECT
• GENERAL PURPOSE 500MHz-5GHz
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
ceo
V
cbo
V
ebo
I
c
I
b
P
tot
T
stg
T
j
Collector emitter voltage 4.5 V
Collector base voltage 15 V
Emitter base voltage 1.5 V
Collector current 40 mA
Base current 4 mA
Total dissipation, Ts = 101
Storage temperature -65 to 150
Max. operating junction temperature 150
180 mW
o
C
o
C
ABSOLUTE MAXIMUM RATINGS
R
thjs
Thermal Resistance Junction soldering point 270
o
C/W
1/7July, 3 2002
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START420
w
ELECTRICAL CHARACTERISTICS (Tj=25 oC,unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
I
cbo
I
ebo
Hfe DC current gain Ic = 20mA, Vce = 3V 100 150
NFmin Minimim noise figure
Ga NFmin associated gain Ic = 5mA, Vce = 2V, f = 1.8GHz 16 dB
|S21|
Gms
P
-1dB
OIP3
Note(1) : Gm s = | S21 / S12 |
PINOUT
Collector cutoff current Vcb = 5V, Ie = 0A 150 nA
Emitter-base cutoff
current
2
(1)
Insertion power gain Ic = 20mA, Vce = 2V, f = 1.8GHz 19.5 dB
Maximum stable gain Ic = 20mA, Vce = 2V, f = 1.8GHz 22.6 dB
1dB compression point Ic = 20mA,Vce = 2V, f = 1.8GHz 12.5 dBm
Ouput third order
intercept point
4
3
Top vie
12
SOT343
Veb = 1.5V, Ic = 0A 15 µA
Ic = 5mA, Vce = 2V, f = 1.8GHz,
Ic = 20mA,Vce = 2V, f = 1.8GHz 23 dBm
Z
s
= Zsopt
1.05 dB
PIN CONNECTION
Pin No. Description
1BASE
3 COLLECTOR
2,4 EMITTER
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Page 3
SPICE PARAMETERS (Gummel-Poon Model, Berkley-SPICE 2G.6 Syntax)
TRANSISTOR CHIP DAT A
Symbol Value Symbol Value Symbol Value
TMEAS 27.0 FC 0.66 XJBC 0.53
IS 1.00E-16 EG 1.12 XTI 3.76
ISE 1.58E-11 NF 1 BF 280
NR 1 NE 3.1 VAF 70
ISC 1.55E-15 BR 9.52 VAR 2.3
o
IKF
TR 7E-10 PTF 32.0 VTF 27.9
XTF 9.84 ITF 0.498 MJE 0.497
RB 12.86 RBM 5 MJC 0.292
RC 3.7 RE 0.42 MJS 0.245
CJE 421E-15 VJE 1.03 IKR 8.32E-3
CJC 160E-15 VJC 0.6 XTB -0.54
CJS 112E-15 VJS 0.4
{0.217*((T(
300.15)^(-1.63)}
C)+273.15)/
NC 1.495 TF 3.0E-12
PACKAGE EQUIVALENT CIRCUIT
C2
C=66 fF
START420
B
L4
L=0.6 nH
. .
B’ C’
L3 L5 L6
L=0.35 nH
C1
Transistor
Chip
E’
L=0.1 nH
L1
.
L=0.05 nHL2
.
E
L=0.3 nH L=0.6 nH
C3
C=334 fFC=436 fF
. .
C
In order to avoid high complexity of the package equivalent circuit, the two emitter leads of SOT-343
package are combined in one electrical connection.
FOR MORE ACCURACY SIMULATION IN SATURATION REGION :
Adding the 5 Spice parameters showed in Table A and using ST Spice Library (available on request) you
can achieve a more a ccuracy simulation in the saturation region. S T Spice library is compatible with
following simulators: ELDO MENTOR (any version), SPECTRE CADENCE (any version), ADS (version
2001 only).
Table A (Spice Parameters extracted in saturation region)
RW Vjj ENP VRP RP
1.173 0.8 2.085 {4.12*((TEMPER+273.15)/300.15)^(0.303)} 1.00E-6
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Page 4
START420
COMMON EMITTER S-PARAMETERS ( VCE = 2V, IC = 20mA )
FREQ
(MHz)
0.1
0.5
0.9
1
1.5
1.8
2
2.5
3
3.5
4
IS11IIS
S
∠Φ S
IIS
21
∠Φ
IS12∠Φ IS22IS22∠Φ
12
0.700 -22 42.223 164 0.010 89 0.932 -12
0.545 -90 27.116 120 0.027 58 0.632 -51
0.480 -130 18.322 98 0.036 48 0.421 -71
0.476 -137 16.756 94 0.038 47 0.387 -75
0.484 -167 11.532 77 0.048 42 0.263 -96
0.494 180 9.528 68 0.052 39 0.210 -111
0.503 172 8.390 63 0.055 37 0.183 -123
0.513 158 6.364 54 0.061 32 0.148 -154
0.533 148 4.936 46 0.069 27 0.143 -171
0.552 140 4.546 37 0.077 21 0.153 178
0.559 134 3.873 28 0.085 14 0.154 163
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START420
TAPE & REEL DIMENSIONS
mm
MIN. TYP. MAX
A 178.5 179 179.5
C 12.8 13.0 13.5
D 20.2
N 54.5 55 55.5
T 14.4
Ao 2.25
Bo 2.7
Ko 1.2
Po 3.8 (cumulative 10 Po) 4.0 4.2 (cumulative 10 Po)
P 4.0
DEVICE ORIENTATION
TOP VIEW END VIEW
420 420 420 420
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START420
PACKAGE DIMENSIONS SOT343 (SC-70 4 leads)
1.30
1.15-1.35
2.00-2.20
1.90-2.10
0.80-1.00
0.25-0.35 0.00-0.10
1.15
0.55-0.65
1.15-1.35
0.45
0.10-0.20
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START420
p
Information furnished is believed to be ac curate and reliable. Howev er, STMicroelec tronics assumes no responsibility for the consequen ces
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implic ation or otherwise u nder any pat ent or patent rights of STMicroelectron i cs . Specifications mentioned in this public at i on are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics product s are not
authorized for use as cri t i cal compone nts in life support devices or systems without express written approval of STMi croelect roni cs .
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