Silicon Surge Voltage Suppressor 5SSB ..X Series Doc. No. 5SYA 1031-01 Nov.95 Features The 5SSB silicon surge voltage suppressor consists of a diffused pnp-Si-wafer mounted with pressure contact in a hermetically sealed metal-ceramic-package. 5SSB silicon surge voltage suppressors are best suited to protect power thyristors against small and medium power surges (e.g. 200 kW over 10 s). They allow the use of thyristors with lower voltage capability and much smaller snubber circuits. Applications are e.g.: Traction, HVDC transmission, generator excitation, transmitter power supply, high power motor controls. Type and ordering number 5SSB 50X0400 5SSB 50X0500 5SSB 38X0600 5SSB 38X0700 5SSB 30X0800 5SSB 30X0900 5SSB 26X1000 5SSB 26X1100 5SSB 23X1200 5SSB 23X1300 5SSB 20X1400 5SSB 20X1500 5SSB 30X1600 5SSB 30X1700 5SSB 30X1800 5SSB 30X1900 5SSB 26X2000 5SSB 26X2100 5SSB 26X2200 5SSB 26X2300 5SSB 23X2400 5SSB 23X2500 5SSB 23X2600 5SSB 23X2700 5SSB 20X2800 5SSB 20X2900 5SSB 20X3000 5SSB 20X3100 VR [V] 450 50 550 50 650 50 750 50 850 50 950 50 1050 50 1150 50 1250 50 1350 50 1450 50 1550 50 1650 50 1750 50 1850 50 1950 50 2050 50 2150 50 2250 50 2350 50 2450 50 2550 50 2650 50 2750 50 2850 50 2950 50 3050 50 3150 50 ABB Semiconductors AG Dimensions in mm Weight: 0.115 kg ABB Semiconductors AG Type and ordering number 5SSB ..X Series Thyristor VDRM VRRM VR IR M [A] IRRM PRAV 10 x 100 s [V] [V] 1 x 10s 1 x 100s 1 x 1ms 5SSB 50X0400 5SSB 50X0500 450 50 550 50 500 600 500 135 5SSB 38X0600 5SSB 38X0700 650 50 750 50 700 800 380 5SSB 30X0800 5SSB 30X0900 850 50 950 50 900 1000 5SSB 26X1000 5SSB 26X1100 1050 50 1150 50 5SSB 23X1200 5SSB 23X1300 PRSM 1 x 10 s 1 x 10ms [A] [W] [kW] 33 7.5 70 30 * 350 100 25 4.5 60 30 * 350 300 80 21 4 50 30 * 350 1100 1200 260 67 18 3.6 41 30 * 350 1250 50 1350 50 1300 1400 230 58 15 3.4 35 30 * 350 5SSB 20X1400 5SSB 20X1500 1450 50 1550 50 1500 1600 200 50 13 3 30 30 * 350 5SSB 30X1600 5SSB 30X1700 5SSB 30X1800 5SSB 30X1900 1650 1750 1850 1950 50 50 50 50 1800 1800 2000 2000 300 80 21 4 50 60 ** 700 5SSB 26X2000 5SSB 26X2100 5SSB 26X2200 5SSB 26X2300 2050 2150 2250 2350 50 50 50 50 2200 2200 2400 2400 260 67 18 3.6 41 60 ** 700 5SSB 23X2400 5SSB 23X2500 5SSB 23X2600 5SSB 23X2700 2450 2550 2650 2750 50 50 50 50 2600 2600 2800 2800 230 58 15 3.4 35 60 ** 700 5SSB 20X2800 5SSB 20X2900 5SSB 20X3000 5SSB 20X3100 2850 2950 3050 3150 50 50 50 50 3000 3000 3200 3200 200 50 13 3 30 60 ** 700 VR Symmetrical avalanche voltage at sin IA = 20 A, tp = 10 s, Tvj = 60 C. IRM Max. avalanche current for a single sine half wave pulse. IRRM Max. avalanche current for 10 pulses of 100 s width, repetition frequency 50 Hz. PRAV Admissible continuous losses at RthCA 1 K/W, TA 60 C. * Single side cooling ** Double side cooling PRSM Peak power losses for a single 10 s current surge. Tvj The initial virtual junction temperature is 60 C. Thermal resistance junction-heatsink: 5SSB 50X0400 ... 20X1500: Rth = 0.5 K/W. 5SSB 30X1600 ... 20X3100 (double sided cooling): Rth = 0.25 K/W. For single sided cooling (5SSB 50X0400 ... 20X1500) the side carrying the serial number shall be cooled. Temperature coefficient of the avalanche voltage VR:+ 0.11 % per degree C: -3 VR (T) = VRO [1 + 1.1 * 10 (T - 60 C)]. VR (60 C) = VRO; VR (25 C) = 0.93* VRO; VR (125 C) = 1.07 * VRO. The blocking current IR is proportional to e [T(C)/20C]. IR (0.8 * VR; Tvj = 45 C): 50 % - Value: < 4 A; Arithm. meanvalue: < 8 A. Junction capacitance at zero voltage (Tvj = 60 C); 5SSB 50X0400 ... 20X1500: 1100 pF; 5SSB 30X1600 ... 20X3100: 550 pF. Storage temperature/max. junction temperature -40...125 C/125 C . Admissible acceleration (vibration): 10 g. Mounting torque: 3.5 Nm. 2 of 6 Doc. No. 5SYA 1031-01 Nov.95 5SSB ..X Series Avalanche voltage VR vs. junction temperature Tvj. 5SSB 50X0400 - 5SSB 20X1500 ABB Semiconductors AG A 5SSB 50X0400 5SSB 50X0500 B 5SSA 38X0600 5SSB 38X0700 C 5SSB 5SSB 5SSB 5SSB 5SSB 5SSB D 5SSB 5SSB 5SSB 5SSB 5SSB 5SSB 30X0800 30X0900 30X1600 30X1700 30X1800 30X1900 26X1000 26X1100 26X2000 26X2100 26X2200 26X2300 E 5SSB 5SSB 5SSB 5SSB 5SSB 5SSB 23X1200 23X1300 23X2400 23X2500 23X2600 23X2700 F 5SSB 5SSB 5SSB 5SSB 5SSB 5SSB 20X1400 20X1500 20X2800 20X2900 20X3000 20X3100 Max. admissible current peak IR vs. base width tp. 5SSB 30X1600 - 5SSB 20X3100 Product of max. admissible square wave current IRRM and avalanche voltage VR in function of pulse width tp; parameter is the repetition frequency. Case temperature Tc 60 C. Doc. No. 5SYA 1031-01 Nov.95 3 of 6 ABB Semiconductors AG 5SSB ..X Series 1 2 3 5SSB 50X0400 5SSB 50X0500 5SSB 38X0600 4 5 6 5SSB 38X0700 5SSB 30X0800 5SSB 30X0900 7 8 9 5SSB 26X1000 5SSB 26X1100 5SSB 23X1200 10 11 12 5SSB 23X1300 5SSB 20X1400 5SSB 20X1500 13 14 15 16 5SSB 30X1600 5SSB 30X1700 5SSB 30X1800 5SSB 30X1900 17 18 19 20 5SSB 26X2000 5SSB 26X2100 5SSB 26X2200 5SSB 26X2300 21 22 23 24 5SSB 23X2400 5SSB 23X2500 5SSB 23X2600 5SSB 23X2700 25 26 27 28 5SSB 20X2800 5SSB 20X2900 5SSB 20X3000 5SSB 20X3100 Avalanche current IR in function of the avalanche voltage VR for single sine wave pulses of base width tp 20s. Tvj = 60 C. 4 of 6 Doc. No. 5SYA 1031-01 Nov.95 5SSB ..X Series ABB Semiconductors AG Avalanche voltage VR vs. base width tp for a single sine half wave current with peak IR as parameter. Tvj = 60 C. Doc. No. 5SYA 1031-01 Nov.95 5 of 6 Avalanche voltage VR vs. base width tp for a single sine half wave current with peak IR as parameter. Tvj = 60 C. Advantages of the 5SSB ..R Surge Voltage Suppressors: * Sharp avalanche-knee: small safety factor ( 1.2) for the protected thyristor required, very small leakage currents at 0.8 x VR; that means higher operating voltages or cost reduction by using thyristors with lower blocking voltage. * Immediate turn-on, no dangerous overshoot as seen e.g. with varistors, thereby clear and safe protection against overvoltages. RC-snubber can be smaller (smaller losses, cheaper), approx. 50-100 nF/100 , to damp RFI oscillations. By using 5SSB, a matching of power thyristors can in most cases be avoided. * 5SSB can be heat sunk and is therefore ideal to protect against repetitive surges. There is no aging, e.g. as compared to varistors (limited number of surges, deterioration of electrical data). The temperature coefficient is the same for both 5SSB and protected thyristor. * In case of a thermal overload, the 5SSB produces always a short circuit, thus still protecting the thyristor. ABB Semiconductors AG Fabrikstrasse 3 CH-5600 Lenzburg, Switzerland Telephone +41 62 888 6300 Fax +41 62 888 6305 Sales Fax +41 62 888 6306 Doc. No. 5SYA 1031-01 Nov.95