PD55025-E PD55025S-E RF POWER transistor, LdmoST plastic family N-channel enhancement-mode, lateral MOSFETs Features ■ Excellent thermal stability ■ Common source configuration ■ POUT = 25 W with 14.5dB gain @ 500 MHz / 12.5 V ■ New RF plastic package PowerSO-10RF (formed lead) Description The device is a common source N-channel, enhancement-mode lateral field-effect RF power transistor. It is designed for high gain, broad band commercial and industrial applications. It operates at 12 V in common source mode at frequencies up to 1 GHz. The device boasts the excellent gain, linearity and reliability of ST’s latest LDMOS technology mounted in the first true SMD plastic RF power package, PowerSO-10RF. The device’s superior linearity performance makes it an ideal solution for car mobile radio. The PowerSO-10 plastic package, designed to offer high reliability, is the first ST JEDEC approved, high power SMD package. It has been specially optimized for RF needs and offers excellent RF performance and ease of assembly. Mounting recommendations are available in www.st.com/rf/ (look for application note AN1294). Table 1. June 2010 PowerSO-10RF (straight lead) Figure 1. Pin connection Source Drain Gate Device summary Order code Package Packing PD55025-E PowerSO-10RF (formed lead) Tube PD55025S-E PowerSO-10RF (straight lead) Tube PD55015TR-E PowerSO-10RF (formed lead) Tape and reel PD55015STR-E PowerSO-10RF (straight lead) Tape and reel Doc ID 12330 Rev 2 1/23 www.st.com 23 Contents PD55025-E, PD55025S-E Contents 1 2 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 Static . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Dynamic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.3 Moisture sensitivity level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 Circuit layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 Common source s-parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2/23 Doc ID 12330 Rev 2 PD55025-E, PD55025S-E Electrical data 1 Electrical data 1.1 Maximum ratings Table 2. Absolute maximum ratings (TCASE = 25°C) Symbol Value Unit V(BR)DSS Drain-source voltage 40 V VGS Gate-source voltage ± 20 V Drain current 7 A Power dissipation (@ TC = 70°C) 79 W Max. operating junction temperature 165 °C -65 to +150 °C Value Unit 1.2 °C/W ID PDISS TJ TSTG 1.2 Parameter Storage temperature Thermal data Table 3. Symbol RthJC Thermal data Parameter Junction - case thermal resistance Doc ID 12330 Rev 2 3/23 Electrical characteristics 2 PD55025-E, PD55025S-E Electrical characteristics TCASE = +25 oC 2.1 Static Table 4. Static Symbol 2.2 Test conditions Min. Unit VGS = 0 VDS = 28 V 1 µA IGSS VGS = 20 V VDS = 0 1 µA VGS(Q) VDS = 28 V ID = 100 mA 5.0 V VDS(ON) VGS = 10 V ID = 3 A 0.8 V GFS VDS = 10 V ID = 3 A CISS VGS = 0 VDS = 12.5 V f = 1 MHz 86 pF COSS VGS = 0 VDS = 12.5 V f = 1 MHz 76 pF CRSS VGS = 0 VDS = 12.5 V f = 1 MHz 5.8 pF 2.0 0.7 2.5 mho Dynamic Symbol POUT Dynamic Test conditions VDD = 12.5 V, IDQ = 200 mA Min. f = 500 MHz Typ. 25 Max. Unit W GP VDD = 12.5 V, IDQ = 200 mA, POUT = 25 W, f = 500 MHz 14.5 dB hD VDD = 12.5 V, IDQ = 200 mA, POUT = 25 W, f = 500 MHz 50 % Load VDD = 15.5 V, IDQ = 200 mA, POUT = 25 W, f = 500 MHz mismatch All phase angles 20:1 VSWR Moisture sensitivity level Table 6. 4/23 Max. IDSS Table 5. 2.3 Typ. Moisture sensitivity level Test methodology Rating J-STD-020B MSL 3 Doc ID 12330 Rev 2 PD55025-E, PD55025S-E 3 Impedance Impedance Figure 2. Current conventions Table 7. Impedance data Freq. (MHz) ZIN (Ω) ZDL(Ω) 175 3.20 - j 4.41 1.56 + j 2.14 480 1.01 - j 1.67 1.06 + j 0.22 500 0.93 - j 1.53 1.12 + j 0.20 520 0.88 - j 1.98 1.07 + j 0.83 Doc ID 12330 Rev 2 5/23 Typical performance PD55025-E, PD55025S-E 4 Typical performance Figure 3. Capacitance vs supply voltage Figure 4. 1000 Drain current vs gate source voltage 6 Vds = 10 V 5 C is s 100 4 Id (A) C (pF) C os s 10 3 2 C rs s 1 f = 1 MHz 1 0 0 4 8 12 16 20 24 28 2.0 2.5 3.0 Figure 5. 3.5 4.0 4.5 5.0 5.5 Vgs (V) Vds (V) Gate-source voltage vs case temperature Figure 6. Output power vs input power 45 1.04 480 MHz 40 500 MHz 520 MHz 1.02 35 Id = 5 A Id (A) Id = 4 A Id = 3 A Pout (W) 30 1.00 25 20 0.98 Id = 2 A 15 Id = 1 A 10 0.96 Id = .5 A 0.94 -25 0 25 50 75 100 0 0.00 1.00 2.00 3.00 P in (W ) Vgs (V) 6/23 Vdd = 12.5 V Idq = 200 m A 5 Vds = 10 V Doc ID 12330 Rev 2 4.00 5.00 6.00 PD55025-E, PD55025S-E Figure 7. Typical performance Output power vs input power Figure 8. 45 18 40 Vdd = 13.8 V 16 35 14 Vdd = 12.5 V 30 12 25 Gp (dB) Pout (W) Power gain vs. output power 20 15 480 MHz 10 520 MHz 8 6 10 4 f = 520 MHz Idq = 200 m A 5 0 1 2 3 4 5 Vdd = 12.5 V Idq = 200 m A 2 0 0 6 0 10 20 30 Pin (W ) Figure 9. 40 50 P out (W ) Drain efficiency vs output power Figure 10. Input return loss vs output power 0 70 Vdd = 12.5 V Idq = 200 m A -5 60 500 MHz -10 50 -15 480, 520 MHz 40 RL (dB) Nd (%) 500 MHz 30 480 MHz -20 -25 500 MHz 20 -30 Vdd = 12.5 V Idq = 200 m A 10 520 MHz -35 0 -40 0 10 20 30 40 50 0 P out (W ) 10 20 30 40 50 P out (W ) Doc ID 12330 Rev 2 7/23 Typical performance PD55025-E, PD55025S-E Figure 11. Output power vs bias current Figure 12. Drain efficiency vs bias current 40 60 35 500 MHz 50 480 MHz 520 MHz 30 480 MHz 520 MHz Nd (%) Pout (W) 40 500 MHz 25 20 30 15 20 10 10 5 Vdd = 12.5 V Pin = 0.85 W Vdd = 12.5 V P in = 0.85 W 0 0 0 200 400 600 800 1000 0 1200 200 400 600 800 1000 1200 Idq (m A) Idq (m A) Figure 13. Output power vs supply voltage Figure 14. Drain efficiency vs supply voltage 70 35 480 MHz 60 30 500 MHz 500 MHz 50 25 500 MHz 20 Nd (%) Pout (W) 520 MHz 40 520 MHz 15 30 10 20 Idq = 200 m A P in = 0.85 W 5 10 0 Idq = 200 m A Pin = 0.85 W 0 5 7 9 11 13 15 17 19 6 Vdd (V) 8/23 8 10 12 Vdd (V) Doc ID 12330 Rev 2 14 16 18 PD55025-E, PD55025S-E Typical performance Figure 15. Output power vs gate bias voltage Figure 16. Output power vs input power (f = 175 MHz) 30 45 40 25 35 30 480 MHz 15 Pout (W) Pout (W) 20 500 MHz 25 20 520 MHz 15 10 10 5 Vdd = 12.5 V Idq = 200 m A 5 Vdd = 12.5 V Pin = 0.85 W 0 0 0 1 2 3 0 4 0.5 1 1.5 2 2.5 Pin (W ) Vgs (V) Figure 17. Power gain vs output power (f = 175 MHz) Figure 18. Drain efficiency vs output power (f = 175 MHz) 30 80 70 25 60 20 Nd (%) Gp (W) 50 15 40 30 10 20 Vdd = 12.5 V Idq = 200 m A 5 Vdd = 12.5 V Idq = 200 m A 10 0 0 0 10 20 30 40 50 0 10 20 30 40 50 P out (W ) P out (W ) Doc ID 12330 Rev 2 9/23 Typical performance PD55025-E, PD55025S-E Figure 19. Input return loss vs output power (f = 175 MHz) 0 -5 RL (dB) -10 -15 -20 Vdd = 12.5 V Idq = 200 m A -25 -30 0 10 20 30 40 50 P out (W ) 10/23 Doc ID 12330 Rev 2 PD55025-E, PD55025S-E 5 Test circuit Test circuit Figure 20. 500 MHz test circuit schematic (engineering) Table 8. Test circuit component part list Component B1,B2 C1,C13 C2,C3,C4,C12,C13,C14 C6 Description Ferrite bead 300 pF, 100 mil chip capacitor 1 to 20 pF trimmer capacitor 39 pF ATC 100B surface mount ceramic chip capacitor C7, C19 120 pF 100 mil chip capacitor C10, C16 10 µF, 50 V electrolytic capacitor C9, C17 0.1 mF, 100 mil chip cap C8, C18 1.000 pF 100 mil chip cap C5, C11 33 pF, 100 mil chip cap L1 N1, N2 56 nH, 7 TURN, Coilcraft Type N flange mount R1 15 Ω, 1 W chip resistor R2 1 kΩ, 1 W chip resistor R3 33 kΩ, 1 W chip resistor Z1 0.471” X 0.080” microstrip Z2 1.082” X 0.080” microstrip Z3 0.372” X 0.080” microstrip Z4,Z5 0.260” X 0.223” microstrip Z6 0.050” X 0.080” microstrip Z7 0.551” X 0.080” microstrip Z8 0.825” X 0.080” microstrip Z9 0.489” X 0.080” microstrip Board Roger, ultra lam 2000 THK 0.030”, εr = 2.55 2oz. ED cu 2 Sides. Doc ID 12330 Rev 2 11/23 Circuit layout 6 PD55025-E, PD55025S-E Circuit layout Figure 21. 500 MHz test circuit %, $6 Figure 22. 500 MHz test circuit photomaster 12/23 Doc ID 12330 Rev 2 ='' * 1' PD55025-E, PD55025S-E Circuit layout Figure 23. 175 MHz test circuit schematic (engineering) FB1 FB2 +V C8 C9 C10 C11 R1 C13 C12 DD ) GG ) +V C16 R2 C14 C15 L1 R3 C6 C1 RF INPUT C2 C3 R5 C4 RF OUTPUT C5 R4 C7 Table 9. 175 MHz test circuit component part list Component Description C1, C6 300 pF chip capacitor C2, C3 91 pF chip capacitor C4, C14 75 pF chip capacitor C5 1-20 pF trimmer capacitor C7 .01 µF molded capacitor C8, C13 10 µF electrolytic capacitor C9, C12 .1 µF chip capacitor C10, C11 1000 pF chip capacitor C15, C16 1200 pF chip capacitor FB1, FB2 Ferrite bead R1 33 kΩ chip resistor R2 17 Ω chip resistor R3 15 Ω chip resistor R4 47 Ω chip resistor R5 220 Ω chip resistor L1 5 turn, 16 AWG magnet wire, ID = .40” , inductor Board Roger, ultra lam 2000, THK 0.030”, εr = 2.55 2oz. ED cu 2 SIDES. Doc ID 12330 Rev 2 13/23 Common source s-parameter PD55025-E, PD55025S-E 7 Common source s-parameter Table 10. S-parameter for PD55025S-E (VDS = 12.5 V ID = 500 mA) Freq (MHz) IS11I S11 < Φ IS21I S21< Φ IS12I S12< Φ IS22I S22< Φ 50 0.837 -162 13.33 89 0.018 -1 0.780 -168 100 0.846 -169 6.51 76 0.017 -12 0.803 -172 150 0.862 -171 4.15 66 0.016 -19 0.831 -172 200 0.878 -173 2.93 58 0.015 -26 0.859 -172 250 0.895 -174 2.20 51 0.013 -31 0.874 -172 300 0.910 -174 1.71 45 0.012 -36 0.886 -173 350 0.921 -175 1.36 40 0.010 -40 0.892 -173 400 0.932 -176 1.11 35 0.009 -42 0.897 -175 450 0.941 -177 0.92 31 0.008 -43 0.915 -176 500 0.946 -178 0.78 27 0.007 -44 0.932 -177 550 0.953 -178 0.66 24 0.006 -43 0.946 -178 600 0.957 -179 0.57 21 0.005 -42 0.964 -179 650 0.960 -180 0.50 18 0.004 -39 0.975 -178 700 0.964 180 0.44 16 0.004 -34 0.976 -179 750 0.966 179 0.39 14 0.003 -29 0.981 -179 800 0.968 178 0.95 12 0.002 -15 0.979 -179 850 0.970 178 0.31 10 0.002 -2 0.964 -179 900 0.971 177 0.28 8 0.002 16 0.960 180 950 0.972 177 0.26 6 0.002 34 0.953 179 1000 0.972 176 0.23 5 0.003 45 0.940 178 Table 11. S-parameter PD55025S-E (VDS = 12.5 V ID = 1.5 A) Freq (MHz) IS11I S11 < Φ IS21I S21< Φ IS12I S12< Φ IS22I S22< Φ 50 0.876 -164 13.87 90 0.013 1 0.823 -172 100 0.880 -172 6.87 79 0.012 -7 0.838 -175 150 0.887 -174 4.46 71 0.012 -13 0.855 -176 200 0.895 -175 3.22 64 0.011 -18 0.873 -175 250 0.905 -176 2.47 58 0.010 -22 0.879 -175 300 0.915 -176 1.96 52 0.009 -25 0.885 -175 350 0.922 -177 1.60 47 0.009 -28 0.886 -175 14/23 Doc ID 12330 Rev 2 PD55025-E, PD55025S-E Table 11. Common source s-parameter S-parameter PD55025S-E (VDS = 12.5 V ID = 1.5 A) (continued) Freq (MHz) IS11I S11 < Φ IS21I S21< Φ IS12I S12< Φ IS22I S22< Φ 400 0.931 -178 1.32 42 0.008 -30 0.889 -177 450 0.938 -178 1.11 38 0.007 -31 0.906 -178 500 0.942 -179 0.95 34 0.006 -31 0.923 -179 550 0.948 -179 0.82 31 0.005 -30 0.937 -179 600 0.952 -180 0.71 28 0.005 -27 0.956 -179 650 0.954 180 0.63 25 0.004 -22 0.967 -179 700 0.959 179 0.55 22 0.003 -16 0.969 -179 750 0.961 178 0.49 20 0.003 -6 0.973 -179 800 0.963 178 0.45 17 0.003 3 0.970 -179 850 0.966 177 0.40 15 0.003 17 0.956 -180 900 0.967 177 0.36 13 0.003 27 0.952 179 950 0.968 176 0.33 11 0.003 38 0.945 179 1000 0.968 176 0.30 9 0.003 45 0.933 177 Table 12. S-parameter for PD55025S-E (VDS = 12.5 V ID = 3 A) Freq (MHz) IS11I S11 < Φ IS21I S21< Φ IS12I S12< Φ IS22I S22< Φ 50 0.890 -165 13.19 91 0.012 2 0.837 -174 100 0.892 -172 6.55 81 0.011 -6 0.846 -176 150 0.898 -174 4.28 73 0.011 -12 0.865 -176 200 0.904 -175 3.11 66 0.010 -15 0.879 -176 250 0.913 -176 2.39 60 0.010 -20 0.883 -176 300 0.921 -177 1.91 54 0.009 -23 0.089 -176 350 0.926 -177 1.57 49 0.008 -25 0.887 -176 400 0.935 -178 1.31 44 0.007 -27 0.889 -177 450 0.941 -179 1.10 40 0.007 -28 0.905 -179 500 0.944 -179 0.94 36 0.006 -27 0.921 -179 550 0.949 -180 0.82 33 0.005 -25 0.936 -180 600 0.953 180 0.71 29 0.004 -21 0.954 180 650 0.955 179 0.63 26 0.004 -17 0.964 -180 700 0.959 179 0.56 24 0.003 -10 0.965 -180 750 0.961 178 0.50 21 0.003 -2 0.968 -180 800 0.963 177 0.45 19 0.003 10 0.966 -179 850 0.966 177 0.41 17 0.003 22 0.952 -180 Doc ID 12330 Rev 2 15/23 Common source s-parameter Table 12. PD55025-E, PD55025S-E S-parameter for PD55025S-E (VDS = 12.5 V ID = 3 A) (continued) Freq (MHz) IS11I S11 < Φ IS21I S21< Φ IS12I S12< Φ IS22I S22< Φ 900 0.967 176 0.37 15 0.003 32 0.948 180 950 0.968 176 0.34 15 0.003 41 0.942 179 1000 0.969 175 0.31 11 0.004 49 0.930 177 Table 13. S-parameter for PD55025S-E (VDS = 13.8 V ID = 3 A) Freq (MHz) IS11I S11 < Φ IS21I S21< Φ IS12I S12< Φ IS22I S22< Φ 50 0.849 -164 13.99 91 0.012 2 0.833 -173 100 0.881 -171 6.94 80 0.011 -6 0.841 -175 150 0.895 -173 4.51 72 0.011 -12 0.857 -175 200 0.903 -175 3.27 65 0.010 -16 0.871 -175 250 0.912 -176 2.50 58 0.010 -21 0.877 -175 300 0.921 -176 1.99 52 0.009 -24 0.882 -175 350 0.927 -177 1.62 47 0.008 -27 0.883 -176 400 0.936 -178 1.35 42 0.007 -29 0.886 -177 450 0.943 -178 1.13 38 0.006 -29 0.904 -178 500 0.946 -179 0.97 34 0.006 -29 0.920 -179 550 0.952 -180 0.83 31 0.005 -26 0.935 -179 600 0.955 180 0.72 27 0.004 -23 0.955 -180 650 0.957 179 0.64 24 0.004 -17 0.965 -179 700 0.961 179 0.56 22 0.003 -8 0.967 -179 750 0.963 178 0.50 19 0.003 2 0.970 -179 800 0.965 178 0.45 17 0.003 14 0.968 -179 850 0.968 177 0.41 15 0.003 27 0.953 -179 900 0.969 176 0.37 13 0.003 36 0.949 180 950 0.970 176 0.34 11 0.003 45 0.943 179 1000 0.971 175 0.31 9 0.003 54 0.930 178 16/23 Doc ID 12330 Rev 2 PD55025-E, PD55025S-E 8 Package mechanical data Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Doc ID 12330 Rev 2 17/23 Package mechanical data Table 14. PD55025-E, PD55025S-E PowerSO-10RF formed lead (Gull Wing) mechanical data Dim. mm. Min. Typ. A1 0 0.05 A2 3.4 3.5 A3 1.2 1.3 A4 0.15 0.2 b 5.4 c D Inch Min. Typ. Max. 0.1 0. 0.0019 0.0038 3.6 0.134 0.137 0.142 1.4 0.046 0.05 0.054 0.25 0.005 0.007 0.009 5.53 5.65 0.212 0.217 0.221 0.23 0.27 0.32 0.008 0.01 0.012 9.4 9.5 9.6 0.370 0.374 0.377 a Max. 0.2 0.007 D1 7.4 7.5 7.6 0.290 0.295 0.298 E 13.85 14.1 14.35 0.544 0.555 0.565 E1 9.3 9.4 9.5 0.365 0.37 0.375 E2 7.3 7.4 7.5 0.286 0.292 0.294 E3 5.9 6.1 6.3 0.231 0.24 0.247 F 0.5 0.019 G 1.2 0.047 L 0.8 1 1.1 R1 0.039 0.25 R2 2 deg 0.031 5 deg 8 deg 2 deg 5 deg T1 6 deg 6 deg T2 10 deg 10 deg Resin protrusions not included (max value: 0.15 mm per side) Figure 24. Package dimensions PowerSO-10RF formed lead )O , -# % % % & % ' 2 5 4 4 , 2 2 ! $ 3EEDETAIL+ $ETAIL+ 3CALE 4 , 3EEDETAIL+ # 2 4 ! ! 18/23 $ 'AUGEPLANE ! 4 0.042 0.01 0.8 T Note: 0.030 2 $ETAIL+ 3CALE Doc ID 12330 Rev 2 Critical dimensions: - Stand-off (A1) - Overall width (L) 8 deg PD55025-E, PD55025S-E Table 15. Package mechanical data PowerSO-10RF straight lead mechanical data Dim. mm. Inch Min. Typ. Max. Min. Typ. Max. A1 1.62 1.67 1.72 0.064 0.065 0.068 A2 3.4 3.5 3.6 0.134 0.137 0.142 A3 1.2 1.3 1.4 0.046 0.05 0.054 A4 0.15 0.2 0.25 0.005 0.007 0.009 a 0.2 0.007 b 5.4 5.53 5.65 0.212 0.217 0.221 c 0.23 0.27 0.32 0.008 0.01 0.012 D 9.4 9.5 9.6 0.370 0.374 0.377 D1 7.4 7.5 7.6 0.290 0.295 0.298 E 15.15 15.4 15.65 0.595 0.606 0.615 E1 9.3 9.4 9.5 0.365 0.37 0.375 E2 7.3 7.4 7.5 0.286 0.292 0.294 E3 5.9 6.1 6.3 0.231 0.24 0.247 F 0.5 0.019 G 1.2 0.047 R1 0.01 R2 0.8 0.031 T1 6 deg 6 deg T2 10 deg 10 deg Resin protrusions not included (max value: 0.15 mm per side) Figure 25. Package dimensions PowerSO-10RF straight lead 5 )O , -# ! 2 4 4 & # , % % % - % ' 2 2 ! $ ! 2 4 ! Note: 0.25 4 2 CRITICAL DIMENSIONS: - Overall width (L) $ Doc ID 12330 Rev 2 19/23 Package mechanical data PD55025-E, PD55025S-E Figure 26. Tube information 20/23 Doc ID 12330 Rev 2 PD55025-E, PD55025S-E Package mechanical data Figure 27. Reel information Doc ID 12330 Rev 2 21/23 Revision history 9 PD55025-E, PD55025S-E Revision history Table 16. 22/23 Document revision history Date Revision Changes 29-Apr-2006 1 Initial release. 03-Jun-2010 2 Added: Table 6: Moisture sensitivity level. Doc ID 12330 Rev 2 PD55025-E, PD55025S-E Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. 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