STPS345FP Power Schottky rectifier Features Very small conduction losses Negligible switching losses Extremely fast switching Low thermal resistance Avalanche capability specified A K A Description Schottky rectifier suited for switch mode power supply and high frequency DC to DC converters. Packaged in TO-22 full pack, this device is intended for use in low voltage, high frequency inverters, free wheeling and polarity protection applications. Table 1. Symbol Device summary Value I F(AV) 3 A V RRM 45 V T j (max) 175 C V F (max) K TO-22FPAC STPS345FP.51 V March 211 Doc ID 18668 Rev 1 1/7 www.st.com 7
Characteristics STPS345FP 1 Characteristics Table 2. Absolute ratings (limiting values) Symbol Parameter Value Unit V RRM Repetitive peak reverse voltage 45 V I F(RMS) Forward rms current 45 A I F(AV) Average forward current δ =.5 T c = 85 C 3 A I FSM Surge non repetitive forward current t p = 1 ms sinusoidal, T c = 25 C 3 A P ARM Repetitive peak avalanche power t p = 1 µs, T j = 25 C 125 W T stg Storage temperature range -65 to + 175 C T j Maximum operating junction temperature (1) + 175 C 1. dptot 1 < condition to avoid thermal runaway for a diode on its own heatsink dtj Rth(j-a) Table 3. Thermal resistance parameters Symbol Parameter Value Unit R th(j-c) Junction to case 4. C/W Table 4. Static electrical characteristics Symbol Parameter Tests conditions Min. Typ. Max. Unit I R (1) V F (1) Reverse leakage current Forward voltage drop T j = 25 C 3 µa V R = V RRM T j = 125 C 2 6 ma T j = 25 C.62 I F = 3 A T j = 125 C.51.57 V T j = 25 C.79 I F = 6 A T j = 125 C.65.72 1. Pulse test: t p = 38 µs, δ < 2% To evaluate the conduction losses use the following equation: P =.42 x I F(AV) +.5 x I 2 F (RMS) 2/7 Doc ID 18668 Rev 1
STPS345FP Characteristics Figure 1. Average forward power dissipation versus average forward current Figure 2. Average forward current versus ambient temperature (δ =.5) P F(AV) (W) 25 2 δ =.2 δ =.5 δ = 1 I F(AV) (A) 35 3 R th(j-a) = R th(j-c) δ =.1 25 15 δ =.5 2 1 15 5 I F(AV) (A) T δ=tp/t tp 5 1 15 2 25 3 35 4 1 5 T δ=tp/t tp T amb( C) 25 5 75 1 125 15 175 Figure 3. Normalized avalanche power derating versus pulse duration Figure 4. Normalized avalanche power derating versus junction temperature 1 P ARM(t p) P ARM(1µs) 1.2 P ARM(T) j P ARM(25 C) 1.1.8.6.1.4.1.1.1 1 t p(µs) 1 1 1.2 T ( C) j 25 5 75 1 125 15 Figure 5. Non repetitive surge peak forward current versus overload duration (maximum values) Figure 6. Relative variation of thermal impedance junction to case versus pulse duration 18 16 14 12 1 8 6 4 2 I (A) M IM t δ=.5 T c=25 C T c=75 C T c=125 C t(s) 1.E-3 1.E-2 1.E-1 1.E+ 1..9.8.7.6.5.4.3.2.1 Z th(j-c) /Rth(j-c) Single pulse t (s) p. 1.E-4 1.E-3 1.E-2 1.E-1 1.E+ 1.E+1 Doc ID 18668 Rev 1 3/7
Characteristics STPS345FP Figure 7. Reverse leakage current versus reverse voltage applied (typical values) Figure 8. Junction capacitance versus reverse voltage applied (typical values) 1.E+2 I ( A) R m T j=15 C 1 C(pF) F=1MHz V osc=3mv RMS T j=25 C 1.E+1 T j=125 C T j=1 C 1.E+ T j=75 C 1 1.E-1 T j=5 C 1.E-2 T j=25 C V R(V) 1.E-3 5 1 15 2 25 3 35 4 45 1 V (V) R 1 1 1 Figure 9. Forward voltage drop versus forward current I FM(A) 6 55 5 45 4 35 3 25 2 15 1 5 T j=125 C (Maximum values) T j=125 C (Typical values) T j=25 C (Maximum values) V FM(V)..1.2.3.4.5.6.7.8 4/7 Doc ID 18668 Rev 1
STPS345FP Package information 2 Package information Epoxy meets UL94,V Lead-free package 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. Table 5. TO-22FPAC dimensions Ref. Millimeters Dimensions Inches H A B Min. Max. Min. Max. A 4.4 4.6.173.181 B 2.5 2.7.98.16 D 2.5 2.75.98.18 Dia E.45.7.18.27 F.75 1.3.39 L2 L3 L6 L5 L7 F1 1.15 1.7.45.67 G 4.95 5.2.195.25 G1 2.4 2.7.94.16 L4 F1 D H 1 1.4.393.49 L2 16 Typ..63 Typ. G1 F E L3 28.6 3.6 1.126 1.25 L4 9.8 1.6.386.417 G L5 2.9 3.6.114.142 L6 15.9 16.4.626.646 L7 9. 9.3.354.366 Dia. 3. 3.2.118.126 Doc ID 18668 Rev 1 5/7
Ordering information STPS345FP 3 Ordering information Table 6. Ordering information Order code Marking Package Weight Base qty Delivery mode STPS345FP STPS345FP TO-22FPAC 2.2 g 5 Tube 4 Revision history Table 7. Document revision history Date Revision Changes 3-Mar-211 1 Initial issue 6/7 Doc ID 18668 Rev 1
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