july 2007 rev 4 1/7 7 mss40, mss50 back to back scr module description packaged in isotop modules, the mss40 / mss50 series is based on two back-to-back scr configurations, providing high noise immunity. they are suitable for high power applications such as solid state relays, heating control systems, welding equipment, motor control circuits... the compactness of the isotop package allows high power density and optimized power bus connections. thanks to their internal ceramic pad, they provide high voltage insulation (2500 v rms ), complying with ul standards (file ref: e81734). figure 1. pin connections table 1. main features symbol value unit i t(rms) 55 and 70 a v drm /v rrm 800 and 1200 v i gt 50 ma table 2. order codes part numbers marking mss40-1200 mss40-1200 mss50-800 mss50-800 MSS50-1200 MSS50-1200 a1 a2 g2 g1 isotop 1: thyristor 2 anode (a2) 2: thyristor 2 gate (g2) 3: thyristor 1 anode (a1) 4: thyristor 2 gate (g1) 4 1 3 2 g1 a2 g2 a1 www.st.com obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
characteristics mss40, mss50 2/7 1 characteristics table 3. absolute ratings (limiting values) symbol parameter value unit mss40 mss50 v drm /v rrm repetitive peak off-state voltage 1200 800 1200 v i t(rms) rms on-state current t c = 80 c 55 a t c = 85 c 70 i tsm non repetitive surge peak on-state current t p = 16.7 ms t j = 25 c 420 630 a t p = 20 ms 400 600 i 2 ti 2 t value for fusing t p = 10 ms t j = 25 c 800 1800 a 2 s di/dt critical rate of ri se of on-state current i g = 2 x i gt , t r 100 ns f = 120 hz t j = 125 c 50 a/s i gm peak gate current t p = 20 s t j = 125 c 4 a p g(av) average gate power dissipation t j = 125 c 1 w t stg t j storage junction temperature range operating junction temperature range - 40 to + 150 - 40 to + 125 c v rgm maximum peak reverse gate voltage 5 v table 4. electrical characteristics (t j = 25 c, unless otherwise specified) symbol test conditions value unit mss40 mss50 i gt v d = 12 v r l = 33 min. 5 ma max. 50 v gt max. 1.3 v v gd v d = v drm r l = 3.3 k t j = 125 c min. 0.2 v i h i t = 500 ma gate open max. 80 ma i l i g = 1.2 i gt max. 120 ma dv/dt v d = 67 % v drm gate open t j = 125 c min. 1000 v/s v tm i tm = 80 a t p = 380 s t j = 25 c max. 1.7 v i tm = 100 a t p = 380 s 1.7 v t0 threshold voltage t j = 125 c max. 0.85 v r d dynamic resistance t j = 125 c max. 11 7 m i drm i rrm v drm = v rrm t j = 25 c max. 20 a t j = 125 c 10 ma table 5. thermal reistances symbol parameter value unit r th(j-c) junction to case (ac) mss40 0.6 c/w mss50 0.45 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
mss40, mss50 characteristics 3/7 figure 2. maximum average power dissipation versus average on-state current figure 3. average and dc on-state current versus case temperature 0 1020304050607080 0 10 20 30 40 50 60 70 80 90 100 p(w) i (a) t(rms) = 180 mss40 mss50 180 0 25 50 75 100 125 150 0 10 20 30 40 50 60 70 80 i (a) t(rms) t (c) case = 180 mss40 mss50 figure 4. relative variation of thermal impedance versus pulse duration figure 5. relative variation of gate trigger current and holding current versus junction temperature 1e-3 1e-2 1e-1 1e+0 1e+1 0.1 0.2 0.5 1.0 k=[z /r th(j-c) th(j-c) ] t (s) p -40 -20 0 20 40 60 80 100 120 140 160 0.0 0.5 1.0 1.5 2.0 2.5 t (c) j i,i,i[t] / gt h l j i ,i ,i [t =25c] gt h l j i gt i h & i l figure 6. surge peak on-state current versus number of cycles figure 7. non-repetitive surge peak on-state current for a sinusoidal pulse with width t p < 10 ms, and corresponding values of i 2 t 1 10 100 1000 0 100 200 300 400 500 600 700 i (a) tsm number of cycles non repetitive t initial=25c j mss40 t =80c repetitive c mss50 t =85c repetitive c mss50 mss40 t=20ms one cycle 5000 1000 100 0.01 0.10 1.00 10.00 i (a), i t (a s) tsm 22 t (ms) p i t 2 i tsm t initial = 25c j di/dt limitation: 50a/s mss50 mss40 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
ordering information scheme mss40, mss50 4/7 2 ordering information scheme figure 10. ordering information scheme figure 8. on-state characteristics (maximum values) (mss40) figure 9. on-state characteristics (maximum values) (mss50) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 10 100 500 i (a) tm v (v) tm t j =max t =25c j v =0.85v r =11m t max.: j t0 d 0.0 1.0 2.0 3.0 4.0 5.0 6.0 10 100 1000 i (a) tm v (v) tm t j =max t =25c j v =0.85v r =7m t max.: j t0 d mss 40 - 800 scr module series voltage current 40 = 55 a 50 = 70 a 800 = 800 v 1200 = 1200 v obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
mss40, mss50 package information 5/7 3 package information epoxy meets ul94, v0 cooling method: by conduction (c) recommended torque value: 0.9 nm (max. 1.2 nm) for the 6 x m4 screws (2 x m4 screws recommended for mounting the package on the heatsink and the 4 provided screws). the screws supplied with the package are adapted for mounting on a board (or other types of terminals) with a thickness of 0.6 mm min. and 2.2 mm max. 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. table 6. isotop dimensions ref. dimensions millimeters inches min. max. min. max. a 11.80 12.20 0.465 0.480 a1 8.90 9.10 0.350 0.358 b 7.8 8.20 0.307 0.323 c 0.75 0.85 0.030 0.033 c2 1.95 2.05 0.077 0.081 d 37.80 38.20 1.488 1.504 d1 31.50 31.70 1.240 1.248 e 25.15 25.50 0.990 1.004 e1 23.85 24.15 0.939 0.951 e2 24.80 typ. 0.976 typ. g 14.90 15.10 0.587 0.594 g1 12.60 12.80 0.496 0.504 g2 3.50 4.30 0.138 0.169 f 4.10 4.30 0.161 0.169 f1 4.60 5.00 0.181 0.197 p 4.00 4.30 0.157 0.69 p1 4.00 4.40 0.157 0.173 s 30.10 30.30 1.185 1.193 f1 f d1 g d s b e1 g1 ?p p1 e e2 g2 c c2 a1 a obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
ordering information mss40, mss50 6/7 4 ordering information 5 revision history table 7. ordering information part number marking package weight base qty delivery mode mss40-1200 mss40-1200 isotop 27 g (without screws) 10 (with screws) tube mss50-800 mss50-800 MSS50-1200 MSS50-1200 table 8. revision history date revision changes sep-2000 3 last release. 11-jul-2007 4 reformated to current standards. removed mss40-800 product. obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
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