SD2941-10
RF power transistors HF/VHF/UHF N-channel MOSFETs
General features
Gold metallization Excellent thermal stability Common source configuration POUT = 175W min. with 15dB gain @ 175MHz Low RDS(on) Thermally enhanced packaging for lower junction temperatures
M174 Epoxy sealed
Pin connection Description
The SD2941-10 is a gold metallized N-Channel MOS field-effect RF power transistor, intended for use in 50 V dc large signal applications up to 230 MHz. It is offering 25% lower R DS(ON) than industry standard, with 20% higher PSAT than ST SD2931-10. The SD2941-10 is housed in the low thermal nonpedestal package, offering 25 % lower thermal resistance than industry standard, thus representing the best-in-class transistors for ISM applications, where reliability and ruggedness are critical factors. 1. Drain 2. Source 3. Gate 4. Source
3 2 4 1
Order codes
Part number SD2941-10 M arking SD2941-10 Package M1 7 4 Packaging Plastic tray
April 2006
Re v 3
1/12
www.st .com 12
SD2941-10
Contents
1 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1 .1 1 .2 1 .3 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Electrical characteristics (TCASE = 25C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 3 4 5 6
Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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SD2941-10
1 Electrical data
1
1.1
Table 1.
Electrical data
Maximum rating
Absolute maximum rating (TCASE = 25C)
Symbol V(BR)DSS(1) VDGR(1) VGS ID PDISS TJ TSTG
1. TJ = 150 C
Parameter D rain Source Voltage D rain-G ate Voltage (RGS = 1M) G ate-Source Voltage D rain Current Power Dissipation M ax. Operating Junction Temperature Storage Temperature
Value 130 130 20 20 389 200 -65 to +150
Unit V V V A W C C
1.2
Table 2.
Thermal data
Thermal data
Parameter Junction to Case thermal resistance Value 0.45 Uni t C/W
Symbol RthJC
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1 Electrical data
SD2941-10
1.3
Table 3.
Electrical characteristics (TCASE = 25C)
Static
Test Conditions VGS = 0 V VGS = 0 V VGS = 20 V VDS = 10 V VGS = 10 V VDS = 10 V VGS = 0 V VGS = 0 V VGS = 0 V IDS = 100 mA VDS = 50 V VDS = 0 V ID = 250 mA ID = 10 A ID = 5 A VDS = 50 V VDS = 50 V VDS = 50 V f = 1 MHz f = 1 MHz f = 1 MHz 5 6 415 236 17 Table 5. 2.0 Min. 130 50 250 Typ. Ma x . Uni t V A nA V V m ho pF pF pF
S y mb o l V(BR)DSS(1) IDSS IGSS VGS(Q) (2) VDS(ON) GF S CISS COSS CRSS
1. TJ = 150C
2. VGS(Q) sorted with alpha/numeric code marked on unit
Table 4.
S y mb o l POUT G PS hD Load Mismatch
Dynamic
Test Conditions VDD = 50 V VDD = 50 V VDD = 50 V VDD = 50 V IDQ = 250 mA IDQ = 250 mA POUT = 175 W IDQ = 250 mA POUT = 175 W IDQ = 250 mA POUT = 175W f = 175MHz f = 175MHz f = 175MHz f = 175MHz Min. 175 14 55 10:1 Typ. 200 15.8 65 Ma x . Unit W dB % V S WR
All Phase Angles
Table 5.
S y mb o l AA BB CC DD EE A B C D
VGS Sorts
Value 1.5 - 1.6 1.6 - 1.7 1.7 - 1.8 1.8 - 1.9 1.9 - 2.0 2.0 - 2.1 2.1 - 2.2 2.2 - 2.3 2.3 - 2.4 S y mb o l E F G H J K L M N Value 2.4 - 2.5 2.5 - 2.6 2.6 - 2.7 2.7 - 2.8 2.8 - 2.9 2.9 - 3.0 3.0 - 3.1 3.1 - 3.2 3.2 - 3.3 S y mb o l P Q R S T U V Value 3.3 - 3.4 3.4 - 3.5 3.5 - 3.6 3.6 - 3.7 3.7 - 3.8 3.8 - 3.9 3.9 - 4.0
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SD2941-10
2 Impedance
2
Figure 1.
Impedance
Impedance data schematic
D ZDL
Typical Input Impedance
Typical Drain Load Impedance
G ZIN
S
Table 6.
f
Impedance data
ZIN () 1.7 - j 5.7 1.2 - j 2.0 ZDL () 6.8 + j 0.9 2.0 + j 2.4
30 MHz 175 MHz
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3 Typical performance
SD2941-10
3
Typical performance
Figure 2.
1000
Capacitance Vs Drain Voltage
Figure 3.
20
Drain Current Vs Gate Voltage
C is s
18 16
Vds = 10 V
C os s 100 C (pF)
14 12 Id (A)
C rs s
10 8 6
10
Freq = 1 MHz
4 Tc = +80 C 2 Tc = +25 C Tc = -20 C 0
1 0 4 8 12 16 20 24 28 32 36 40 44 48 52 Vdd (V)
0
1
2
3 Vgs (V)
4
5
6
Figure 4.
Max. Thermal Resist.Vs Case Temp. Figure 5.
Safe Operating Area
100
0 .6
RTH(j-c) (C/W)
0 .5 6
0 .5 2
Ids(A)
10
(1 )
0 .4 8
0 .4 4 25 35 45 55 65 75 85
1 1 10 100 1000
T c, CASE TEMPERATURE (C)
Vds(V)
(1) Current in this area may be limited by Rds(on)
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SD2941-10
Figure 6.
22 21 20
3 Typical performance
Power Gain Vs Output Power
Figure 7.
80 70
Efficiency Vs Output Power
175 MHz 60
100 MHz
19 Gain (dB) 18
50 Nd (%) 100 MHz 40 30
175 MHz
17 16 15 14 13 12 0 25 50 75 100 125 150 175 200 225 250 275 Pout (W) Vdd = 50V Idq = 250mA
20 10 0 0 25 50 75 100 125 15 0 175 200 22 5 250 275 P out (W )
Vdd = 50V Id q = 250mA
Table 7.
Input Return Loss Vs Output Power
24
20 175 MHz 16 R TL (dB)
12
8
100 MHz
4 Vdd = 50V Idq = 250mA 0 0 25 50 75 100 125 150 175 200 225 250 275 Pout (W)
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4 Test circuit
SD2941-10
4
Figure 8.
Test circuit
30 MHz Test circuit schematic (Engineering test circuit)
Not e:
All dimension are in inches.
Table 8.
30 MHz test circuit component part list
Description 1:4 Transformer, 25 Semi-Rigid Coax .141 OD 6" Long Toroid X 2, 0.5" OD .312" ID 850 2 Turns VK200 Shield Bead, 1" OD 0.5" ID 850 3 Turns 1/4 Wave Choke, 50 Semi-Rigid Coax .141 OD 12" Long 0.62" Woven Fiberglass, 1 oz. Copper, 2 Sides, r = 2.55 470 1 W Chip Resistor 360 1/2 W Resistor 20 K 10 Turn Potentiometer 560 1 W Resistor 470 pF ATC Chip Cap 43 pF ATC Chip Cap Arco 404, 12-65 pF Arco 423, 16-100 pF 120 pF ATC Chip Cap 0.01 F ATC Chip Cap 30 pF ATC Chip Cap 91 pF ATC Chip Cap 1200 pF ATC Chip Cap 0.01 F / 500 V Chip Cap 10 F 63 V Electrolytic Capacitor T2 FB1
Simbol
FB2, FB3 FB4 L1 PCB R1, R3 R2 R4 R5 C1, C11 C2 C3, C8, C9 C4 C5 C6 C7 C10 C12, C15 C13, C14,C16, C17 C18 8/12
SD2941-10
Figure 9. 175 MHz test circuit pPhotomaster
4 Test circuit
6.4 inches
Figure 10. 175 MHz test circuit
4 inches
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5 Mechanical data
SD2941-10
5
Table 9.
DIM.
Mechanical data
M174 (.500 DIA 4/L N/HERM W/FLG)
m m. MI N. A B C D E F G H I J K L M 25.53 24.64 12.57 0.08 2.11 3.81 6.22 18.28 3.18 24.89 12.83 0.18 3.00 4.45 7.11 26.67 1.005 0.970 0.495 0.003 0.083 0.150 5.56 3.18 6.48 18.54 0.245 0.720 0.125 0.980 0.505 0.007 0.118 0.175 0.280 1.050 5.584 0.219 0.125 0.255 0.730 0.230 TYP. M AX MIN. inch TYP. MA X
Figure 11. M174 Package dimensions
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SD2941-10
6 Revision history
6
Revision history
Table 10.
D ate 15-Nov-2005 06-Apr-2006 13-Apr-2006
Revision history
Revision 1 2 3 First Issue Complete version VDS(ON) updated Changes
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6 Revision history
SD2941-10
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