SD2931-10
RF power transistors HF/VHF/UHF N-channel MOSFETs
Features
Gold metallization Excellent thermal stability Common source configuration POUT = 150 W min. with 14 dB gain @ 175 MHz Thermally enhanced packaging for lower junction temperatures
Description
The SD2931-10 is a gold metallized N-channel MOS field-effect RF power transistor. Being electrically identical to the standard SD2931 MOSFET, it is intended for use in 50 V dc large signal applications up to 230 MHz. The SD2931-10 is mechanical compatible to the SD2931 but offers in addition a better thermal capability (25 % lower thermal resistance), representing the best-in-class transistors for ISM applications, where reliability and ruggedness are critical factors.
M174 Epoxy sealed
Figure 1.
Pin connection 4 1
3 1. Drain 2. Source
2 3. Gate 4. Source
Table 1.
Device summary
Marking SD2931-10 Package M174 Packaging Plastic tray
Order code SD2931-10
March 2008
Rev 6
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www.st.com 16
Contents
SD2931-10
Contents
1 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 1.2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 2.2 Static . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 D ynamic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 4 5 6 7 8
Impedance data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Circuit layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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SD2931-10
Electrical data
1
1.1
Electrical data
Maximum ratings
Table 2.
Symbol V(BR)DSS(1) VDGR VGS ID PDISS TJ TSTG
1. TJ = 150C
Absolute maximum ratings (TCASE = 25 C)
Parameter Drain source voltage Drain-gate voltage (RGS = 1 M) Gate-source voltage Drain current Power dissipation Max. operating junction temperature Storage temperature Value 125 125 20 20 389 200 -65 to +150 Unit V V V A W C C
1.2
Thermal data
Table 3.
Symbol RthJC
Thermal data
Parameter Junction - case thermal resistance Value 0.45 Unit C/W
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Electrical characteristics (TCASE = +25 C)
SD2931-10
2
2.1
Electrical characteristics (TCASE = +25 C)
Static
Table 4.
Symbol V(BR)DSS IDSS IGSS VGS(Q)
(1)
Static (per side)
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 6 480 190 18 Min 125 50 250 See table below 3.0 Typ Max Unit V A nA V V mho pF pF pF
VDS(ON) GFS CISS COSS CRSS
1. VGS(Q) sorted with alpha/numeric code marked on unit.
2.2
Dynamic
Table 5.
Symbol POUT GPS nD VDD = 50 V
Dynamic
Test conditions IDQ = 250 mA f = 175 MHz Min 150 14 55 10:1 15 65 Typ Max Unit W dB % VSWR
VDD = 50 V IDQ = 250 mA POUT = 150 W f = 175 MHz VDD = 50 V IDQ = 250 mA POUT = 150 W f = 175 MHz
VDD = 50 V IDQ = 250 mA POUT = 150 W f = 175 MHz Load mismatch All phase angles
Table 6.
A B C D E F G H J
VGS sorts
2.0 - 2.1 2.1 - 2.2 2.2 - 2.3 2.3 - 2.4 2.4 - 2.5 2.5 - 2.6 2.6 - 2.7 2.7 - 2.8 2.8 - 2.9 K L M N P Q R S 2.9 - 3.0 3.0 - 3.1 3.1 - 3.2 3.2 - 3.3 3.3 - 3.4 3.4 - 3.5 3.5 - 3.6 3.6 - 3.7
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SD2931-10
Impedance data
3
Impedance data
Figure 2. Impedance data
D
ZDL
Typical Input Impedance
Typical Drain Load Impedance
G
Zin
S
Table 7.
Impedance data
Freq 30 MHz 175 MHz ZIN () 1.7 - j 5.7 1.2 - j 2.0 ZDL () 6.8 + j 0.9 2.0 + j 2.4
5/16
Typical performance
SD2931-10
4
Figure 3.
10000
Typical performance
Capacitance vs drain-source voltage Figure 4. Drain current vs gate voltage
20
Tc=-20 C
ID, DRAIN CURRENT (A)
C, CAPACITANCE (pF)
f =1MHz
15
Tc=+25 C
1000
Ciss
10
VDS = 10 V
Coss
Tc=+80 C
100
5
Crss
10 0 10 20 30 40 50
0 2 2 .5 3 3 .5 4 4 .5 5 5 .5 6
VDS, DRAIN-SOURCE VOLTAGE (V)
VGS, GATE-SOURCE VOLTAGE (V)
Figure 5.
VGS, GATE-SOURCE VOLTAGE (NORMALIZED)
Gate-source voltage vs case temperature
Figure 6.
Maximum thermal resistance vs case temperature
1.12 1.08 1.04 1 0.96 0.92 0.88
Id =.25A Id =.1A Id =4A Id =2A Id =1A Id =9A Id =10A Id =11A Id =7A Id =5A
0.6
RTH(j-c) (C/W)
0.56
0.52
0.48
Vds= 10 V
0.84 0.8 -25 0 25
0.44 25 35 45 55 65 75 85
100
50
75
Tc, CASE TEMPERATURE (C)
Tc, CASE TEMPERATURE (C)
Figure 7.
100
Safe operating area
Ids(A)
10
(1)
1 1 10 100 1000
Vds(V)
(1) Current in this area may be limited by Rds(on)
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SD2931-10
Typical performance 175 MHz
5
Figure 8.
270
Typical performance 175 MHz
Output power vs input power Figure 9.
270
Output power vs input power
Pout, OUTPUT POWER (W)
Pout, OUTPUT POWER (W)
240 210 180 150 120 90 60 30 0 0 5 10 15
Vdd= 50V Vdd= 40V
240 210 180 150 120 90 60 30 0 0 5 10 15
Vdd= 50V Idq= 250mA f= 175MHz
Tc =-20 C Tc =+25 C
Tc =+80 C
f= 175MHz Idq= 250mA
20 25
Pin, INPUT POWER (W)
20
25
Pin, INPUT POWER(W)
Figure 10. Power gain vs output power
18
Figure 11. Efficiency vs output power
80 70 60 50 40 30 20 0 50 100 150 200 250
Gp, POWER GAIN (dB)
14 12 10 8 6 0 50 100 150 200 250
Vdd=50V Idq=250mA f=175Mhz
Nd, EFFICIENCY (%)
16
Vdd=50V Idq=250mA f=175Mhz
Pout, OUTPUT POWER (W)
Pout, OUTPUT POWER (W)
Figure 12. Output power vs supply voltage
270 240 Pin =10W
Figure 13. Drain current vs gate-source voltage
20
Tc=-20 C
Pout,OUTPUT POWER(W)
ID, DRAIN CURRENT (A)
210 180 150 Pin =2.5W 120 90 60 30 0 24 28 32 36 40 44 48 52 Idq= 250mA f= 175MHz Pin =5W
15
Tc=+25 C
10
Tc=+80 C
5
0 2 2.5 3 3.5 4 4.5 5 5.5 6
Vdd,DRAIN VOLTAGE(V)
VGS, GATE-SOURCE VOLTAGE (V)
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Test circuit
SD2931-10
6
Test circuit
Figure 14. 175 MHz test circuit schematic (production test circuit)
Note: All dimensions in inches REF. 1021579C
Table 8.
Component part list
Description 4:1 transformer, 25 ohm flexible coax .090 OD 6" long 1:4 transformer, 25 ohm 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 ohm semi-rigid coax .141 OD 12" Long 0.62" woven fiberglass, 1 oz. copper, 2 sides, r = 2.55 470 ohm 1 W chip resistor 360 ohm 1/2 W resistor 20 Kohm 10 turn potentiometer 560 ohm 1 W resistor 470 pF ATC chip cap 43 pF ATC chip cap Arco 404, 12-65 pF Arco 423, 16-100 pF
Component T1 T2 FB1 FB2, FB3 FB4 L1 PCB R1, R3 R2 R4 R5 C1, C11 C2 C3, C8, C9 C4
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SD2931-10 Table 8. Component part list (continued)
Description 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
Test circuit
Component C5 C6 C7 C10 C12, C15 C13, C14,C16, C17 C18
Figure 15. 175 MHz test circuit photomaster
6.4 inches
4 inches
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Test circuit Figure 16. 175 MHz test circuit
SD2931-10
10/16
SD2931-10
Typical performance 30 MHz
7
Typical performance 30 MHz
Figure 18. Power gain vs output power
Figure 17. Output power vs input power
250
Pout, OUTPUT POWER (W)
30
PG, POWER GAIN (dB)
Vdd = 50 V
200 150 100 50 0 0 0.1 0.2 0.3 0.4 0.5
29 28 27 26 25 24 0 40 80 120 160 200
Vdd = 40 V f = 30 MHz IDQ = 250 mA
f = 30 MHz VDD = 50 V IDQ = 250 mA
Pin, INPUT POWER (W)
Pout, OUTPUT POWER (W)
Figure 19. Efficiency vs output power
70 60
Figure 20. Output power vs supply voltage
200
Pin=.31 W Pin=.22 W
Efficiency (%)
50
150
Pout(W)
40 30 20 10 0 0 40 80 120 160 200
f = 30 MHz VDD = 50 V IDQ = 250 mA
100
Pin=.13 W f = 30 MHz IDQ = 250 mA
50
0 24 28 32 36 40 44 48 52
Pout, OUTPUT POWER (W)
VDD(V)
Figure 21. Output power vs gate voltage
Pout, OUTPUT POWER (W)
200
T= +25 C
150
T= -20 C
100
T= +80 C VDD = 50 V IDQ = 250 mA f = 30 MHz Pin = Constant
0 1 2 3 4 5 6
50
0
VGS GATE-SOURCE VOLTAGE (V)
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Test circuit 30 MHz
SD2931-10
8
Test circuit 30 MHz
Figure 22. 30 MHz test circuit schematic (engineering test circuit)
Figure 23. 30 MHz test circuit component part list
Symbol T1 T2 FB1 FB2 FB3 RFC1 PCB R1, R3 R2 Description 9:1 transformer, 25 flexible coax with extra shield .090 OD 15" long 1:4 transformer, 50 flexible coax .225 OD 15" long Toroid 1.7" OD .30" ID 220 4 turns Surface mount EMI shield bead Toroid 1.7" OD .300" ID 220 3 turns Toroid 0.5" OD 0.30" ID 125 4 turns 12 awg wire 0.62" Woven Fiberglass, 1 oz. Copper, 2 Sides, r = 2.55 1 K 1 W chip resistor 680 3 W wirewound resistor
C1,C4,C6,C7,C8,C 9, 0.1 F ATC chip cap C11,C12,C13 C2,C3 C5 C10 C14 750 pF ATC chip cap 470 pF ATC chip cap 10 F 63 V electrolytic capacitor 100 F 63 V electrolytic capacitor
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SD2931-10
Package mechanical data
9
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK packages. These packages have a lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
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Package mechanical data Table 9.
Dim. Min A B C D E F G H I J K L M 25.53 3.05 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 3.30 1.005 0.120 0.970 0.495 0.003 0.083 0.150 5.56 3.18 6.48 18.54 0.245 0.720 0.125 Typ Max 5.584 Min 0.219 0.125 Typ
SD2931-10
M174 (0.500 DIA 4/L N/HERM W/FLG) mechanical data
mm. Inch Max 0.230
0.255 0.730
0.980 0.505 0.007 0.118 0.175 0.280 1.050 0.130
Figure 24. Package dimensions
Controlling Dimension: Inches
1011000D
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SD2931-10
Revision history
10
Revision history
Table 10.
Date 09-Sep-2004 17-Jun-2004 04-Mar-2008
Document revision history
Revision 4 5 6 Updated Table 5: Dynamic on page 4 Updated Table 4: Static (per side), Table 5: Dynamic and Table 6: VGS sorts on page 4 Changes
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SD2931-10
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