STTH108 High voltage ultrafast rectifier Features ■ Low forward voltage drop ■ High reliability A ■ High surge current capability A ■ Soft switching for reduced EMI disturbances ■ Planar technology K K Description SMA DO-41 (JEDEC DO-214AC) STTH108 The STTH108, which is using ST ultrafast high STTH108A voltage planar technology, is specially suited for free-wheeling, clamping, snubbering, T able 1. Device summary demagnetization in power supplies and other power switching applications. Symbol Value I 1 A F(AV) V 800 V RRM T (max) 175 °C j V (max) 1.25 V F October 2009 Doc ID 9342 Rev 3 1/6 www.st.com 6

Characteristics STTH108 1 Characteristics T able 2. Absolute ratings (limiting values) Symbol Parameter Value Unit V Repetitive peak reverse voltage 800 V RRM V Voltage rms 560 V (RMS) SMA T = 110 °C δ = 0.5 L I Average forward current 1 A F(AV) DO-41 T = 130 °C δ = 0.5 L SMA 20 I Forward Surge current t = 8.3 ms A FSM DO-41 25 T Storage temperature range -50 to + 175 °C stg T Maximum operating junction temperature 175 °C j T able 3. Thermal resistance Symbol Parameter Value Unit SMA 30 R Junction to lead th(j-l) Lead length = 10 mm DO-41 45 °C/W Rth(j-a) Junction to ambient Lead length = 10 mm DO-41 110 T able 4. Static electrical characteristics Symbol Parameter Tests conditions Min. Typ. Max. Unit Reverse leakage Tj = 25 °C 5 I V = 800 V µA R current R T = 125 °C 1 50 j Tj = 25 °C 1.65 VF Forward voltage drop IF = 1 A V T = 125 °C 0.89 1.25 j To evaluate the conduction losses use the following equation: P = 1.05 x I + 0.20 I 2 F(AV) F (RMS) T able 5. Dynamic electrical characteristics Symbol Parameter Tests conditions Min. Typ. Max. Unit I = 0.5 A, Reverse F t T = 25 °C I = 0.25 A 75 ns rr recovery time j rr I = 1 A R I = 1 A, Forward F t T = 25 °C dI /dt = 50 A/ms 200 ns fr recovery time j F V = 1.1 x V max FR F Forward I = 1 A, V T = 25 °C F 12 V FP recovery voltage j dI /dt = 50 A/ms F 2/6 Doc ID 9342 Rev 3

STTH108 Characteristics Figure 1. C onduction losses versus average Figure 2. Forward voltage drop versus current forward current P(W) IFM(A) 1.6 100.0 δ= 0.1 δ= 0.2 δ= 0.5 1.4 δ= 0.05 Tj=150°C (maximum values) 1.2 δ= 1 Tj=150°C 10.0 (typical values) 1.0 0.8 Tj=25°C (maximum values) 0.6 1.0 0.4 T 0.2 IF(AV)(A) δ=tp/T tp VFM(V) 0.0 0.1 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 Figure 3. R elative variation of thermal Figure 4. Relative variation of thermal impedance junction ambient versus impedance junction ambient versus pulse duration (DO-41) pulse duration (epoxy FR4) (SMA) Zth(j-c)/Rth(j-c) Zth(j-c)/Rth(j-c) 1.0 1.0 epoxyFR4,leads=10mm 0.9 0.9 0.8 0.8 0.7 0.7 0.6 0.6 δ= 0.5 δ= 0.5 0.5 0.5 0.4 0.4 0.3 0.3 δ= 0.2 δ= 0.2 T δ= 0.1 T 0.2 0.2 δ= 0.1 0.1 Single pulse tp(s) δ=tp/T tp 0.1 Single pulse tp(s) δ=tp/T tp 0.0 0.0 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03 Figure 5. T hermal resistance junction to Figure 6. Thermal resistance junction to ambient versus copper surface ambient versus copper surface under each lead (DO-41) under each lead (SMA) Rth(j-a)(°C/W) Rth(j-a)(°C/W) 120 140 110 epoxy printed circuit board FR4,copper thickness:35 µm 130 epoxy printed circuit board FR4,copper thickness:35 µm 100 120 110 90 100 80 90 70 80 60 70 50 60 40 50 40 30 30 20 20 10 S(cm²) 10 S(cm²) 0 0 0 1 2 3 4 5 6 7 8 9 10 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Doc ID 9342 Rev 3 3/6

Package information STTH108 2 Package information ● Epoxy meets UL 94, V0 ● Band indicates cathode ● Bending method (DO-41): see Application note AN1471 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. T able 6. SMA dimensions Dimensions Ref. Millimeters Inches E1 Min. Max. Min. Max. D A1 1.90 2.45 0.075 0.094 A2 0.05 0.20 0.002 0.008 b 1.25 1.65 0.049 0.065 E c 0.15 0.40 0.006 0.016 D 2.25 2.90 0.089 0.114 A1 E 4.80 5.35 0.189 0.211 C A2 L b E1 3.95 4.60 0.156 0.181 L 0.75 1.50 0.030 0.059 Figure 7. Footprint (dimensions in mm) 1.4 2.63 1.4 1.64 5.43 T able 7. DO-41 (plastic) package dimensions Dimensions Ref. Millimeters Inches Min. Max. Min. Max. ØD ØB A 4.07 5.20 0.160 0.205 B 2.04 2.71 0.080 0.107 C A C C 25.4 1 D 0.71 0.86 0.028 0.034 4/6 Doc ID 9342 Rev 3

STTH108 Ordering information 3 Ordering information T able 8. Ordering information Order code Marking Package Weight Base qty Delivery mode STTH108 STTH108 DO-41 0.34 g 2000 Ammopack STTH108A H08 SMA 0.068 g 5000 Tape and reel STTH108RL STTH108 DO-41 0.34 g 5000 Tape and reel 4 Revision history T able 9. Document revision history Date Revision Changes Jan-2003 2 Last update. 30-Sep-2009 3 Updated table 7 package dimensions. Doc ID 9342 Rev 3 5/6

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