Trisil for telecom equipment protection Features bidirectional crowbar protection voltage: 8 V low leakage current: I R = 2 µa max holding current: I H = 15 ma min repetitive peak pulse current: I PP = 75 A (1/1 µs) Benefits Trisils are not subject to ageing and provide a fail safe mode in short circuit for a better protection. This device can be used to help equipment to meet main standards such as UL195, IEC 95 / CSA C22.2 and UL1459. Trisils have UL94 V approved resin. SMB package is JEDEC registered (DO-214AA). Trisils comply with the following standards: GR-189 Core ITU-T-K2/K21 VDE433 VDE878 IEC 61-4-5 FCC part 68 Applications Any sensitive equipment requiring protection against lightning strikes and power crossing: Ethernet, T1/E1 Figure 1. Description SMB (JEDEC DO-214AA) Device configuration The SMP75 is a very low voltage transient surge arrestor especially designed to protect sensitive telecommunication equipment against lightning strikes and other transients. Its low voltage makes it suitable to protect low voltage transformer in T1/E1 and Ethernet links without saturation of the transformer. TM: Trisil is a trademark of STMicroelectronics. October 21 Doc ID 515 Rev 5 1/9 www.st.com 9
Characteristics SMP75 1 Characteristics Table 1. In compliance with the following standards Peak surge Waveform Required peak Standard voltage voltage current (A) (V) Current waveform Minimum serial resistor to meet standard (Ω) GR-189 Core First level GR-189 Core Second level GR-189 Core Intra-building ITU-T-K2/K21 ITU-T-K2 (IEC61-4-2) VDE433 VDE878 IEC61-4-5 FCC Part 68, lightning surge type A FCC Part 68, lightning surge type B 25 1 2/1 µs 1/1 µs 5 1 2/1 µs 1/1 µs 5 2/1 µs 5 2/1 µs 1 15 2/1 µs 1 2/1 µs 6 15 8 15 4 2 4 2 4 4 15 8 1/7 µs 1/6 ns 1/7 µs 1.2/5 µs 1/7 µs 1.2/5 µs 1/16 µs 1/56 µs 15 37.5 5/31 µs ESD contact discharge ESD air discharge 1 5 1 5 1 1 2 1 5/31 µs 1/2 µs 5/31 µs 8/2 µs 1/16 µs 1/56 µs 1 9/72 µs 25 5/32 µs 5 3.3 1 2.5 2/9 Doc ID 515 Rev 5
Characteristics Table 2. Absolute ratings (T amb = 25 C) Symbol Parameter Value Unit I PP Repetitive peak pulse current 1/1 µs 8/2 µs 1/56 µs 5/31 µs 1/16 µs 1/2 µs 2/1 µs I FS Fail-safe mode : maximum current (1) 8/2 µs 5 ka I TSM I²t Non repetitive surge peak on-state current (sinusoidal) I²t value for using t =.2 s t = 1 s t = 2 s t = 15 mn t = 16.6 ms t = 2 ms 75 25 1 12 15 25 25 14 8 6.5 2 12 12.2 T stg Storage temperature range -55 to + 15 C Tj Maximum junction temperature 15 C T L Maximum lead temperature for soldering during 1 s. 26 C 1. In fail safe mode, the device acts as a short circuit. Table 3. Thermal resistances Symbol Parameter Value Unit R th(j-a) Junction to ambient (with recommended footprint) 1 C/W R th(j-l) Junction to leads 2 C/W A A A²s Table 4. Symbol V RM V BR V BO I RM I PP I BO I H V R I R C Electrical characteristics - definitions (T amb = 25 C) Parameter Stand-off voltage Breakdown voltage Breakover voltage Leakage current Peak pulse current Breakover current Holding current Continuous reverse voltage Leakage current at V R Capacitance Doc ID 515 Rev 5 3/9
Characteristics SMP75 Table 5. Order code Electrical characteristics - values (T amb = 25 C) I RM @ V RM I R (1) @ V R Dynamic V BO Static V BO @ I BO I H C (2) max. max. max. max. max. typ. max. µa V µa V V V ma ma pf SMP75-8 2 6 5 8 2 15 8 5 6 1. I R measured at V R guaranteed V BR min V R 2. V R = 2 V bias, V RMS = 1 V, F = 1 MHz Figure 2. Pulse waveform Figure 3. Non repetitive surge peak on-state current versus overload duration % I PP I TSM(A) 1 Repetitive peak pulse current t r = rise time (µs) t p = pulse duration time (µs) 5 45 4 35 3 F=5Hz Tj initial = 25 C 5 25 2 15 t r t p t 1 5 t(s) 1E-2 1E-1 1E+ 1E+1 1E+2 1E+3 Figure 4. 1 I T(A) Tj=25 C On-state voltage versus on-state current (typical values) Figure 5. 2. 1.8 1.6 1.4 1.2 1..8.6.4 I H[Tj] / I H[Tj=25 C] Relative variation of holding current versus junction temperature 1 V (V) T 1 2 3 4 5 6 7 8.2. Tj( C) -4-3 -2-1 1 2 3 4 5 6 7 8 9 1 11 12 13 4/9 Doc ID 515 Rev 5
Characteristics Figure 6. V BO[Tj] / V BO[Tj=25 C] 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1..99.98.97.96.95.94 Figure 8. 1..9.8.7.6.5.4.3.2.1. Relative variation of breakover voltage versus junction temperature Tj( C) -4-3 -2-1 1 2 3 4 5 6 7 8 9 1 11 12 13 Z th(j-a) /Rth(j-a) Variation of thermal impedance junction to ambient versus pulse duration Printed circuit board FR4, copper thickness = 35 µm, recommended pad layout tp(s) 1.E-2 1.E-1 1.E+ 1.E+1 1.E+2 1.E+3 Figure 7. 1 1 1 1 1 Figure 9. 1.2 1.1 1..9.8.7.6.5.4.3.2.1. Relative variation of leakage current versus reverse voltage applied (typical values) I R[Tj] / I R[Tj=25 C] Tj( C) 25 5 75 1 125 C [V R] / C [V R=2V] Relative variation of junction capacitance versus reverse voltage applied (typical values) V (V) R F =1MHz V OSC = 1VRMS Tj = 25 C 1 1 Doc ID 515 Rev 5 5/9
Ordering information scheme SMP75 2 Ordering information scheme Figure 1. Ordering information scheme SMP 75-8 Trisil surface mount Repetitive peak pulse current 75 = 75 A Voltage 8 = 8 V 6/9 Doc ID 515 Rev 5
Package information 3 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 6. SMB Dimensions Dimensions E1 Ref. Millimeters Inches Min. Max. Min. Max. D A1 1.9 2.45.75.96 A2.5.2.2.8 b 1.95 2.2.77.87 E c.15.4.6.16 C L A1 A2 b D 3.3 3.95.13.156 E 5.1 5.6.21.22 E1 4.5 4.6.159.181 L.75 1.5.3.59 Figure 11. Footprint (dimensions in mm) 1.62 2.6 (.64) (.12) 1.62 (.64) 2.18 (.86) 5.84 (.23) Doc ID 515 Rev 5 7/9
Ordering information SMP75 4 Ordering information Table 7. Ordering information Order code Marking Package Weight Base qty Delivery mode SMP75-8 L8 SMB.11 g 25 Tape and reel 5 Revision history Table 8. Document revision history Date Revision Changes 19-July-25 3 Previous issue 2-Jan-26 4 19-Oct-21 5 Added ECOPACK statement and changed page layout. Minor updates to technical values in Tables 1, 2, and 4. Updated ECOPACK statement. Updated trademark statement. Updated Figure 11. Removed Section 2 Test circuits. 8/9 Doc ID 515 Rev 5
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