SMF Series RoHS Pb e3 Uni-directional Description The SMF series is designed specifically to protect sensitive electronic equipment from voltage transients induced by lightning and other transient voltage events. SMF package is 5% smaller in footprint when compare to SMA package and deliverying one of the low height profiles (1.1mm in the industry. Features Agency Approvals AGENCY Maximum Ratings and Thermal Characteristics (T A =25 O C unless otherwise noted Parameter Symbol Value Unit Peak Pulse Power Dissipation at T A =25ºC by 1/1µs (Note 1 Thermal Resistance Junction- to- Ambient Thermal Resistance Junction- to- Lead AGENCY FILE NUMBER E23531 P PPM 2 W R θja 22 C/W R θjl 1 C/W Operating Temperature Range T J -65 to 15 C Storage Temperature Range T STG -65 to 175 C Notes: 1. Non-repetitive current pulse, per Fig. 4 and derated above T J (initial =25ºC per Fig. 3. 2W peak pulsepower capability at 1/1µs waveform, repetition rate (duty cycle:.1% Compatible with industrial standard package SOD-123FL Low profile: maximum height of 1.1mm. Low inductance, excellent clamping capability For surface mounted applications to optimize board space High temperature to reflow soldering guaranteed: 26 C/4sec Typical failure mode is short from over-specified voltage or current Whisker test is conducted based on JEDEC JESD21A per its table 4a and 4c IEC-61-4-2 ESD 3kV(Air, 3kV (Contact ESD protection of data lines in accordance with IEC 61-4-2 EFT protection of data lines in accordance with IEC 61-4-4 Fast response time: typically less than 1.ns from Volts to V BR min Glass passivated junction Built-in strain relief Plastic package is flammability rated V- per Underwriters Laboratories Meet MSL level1, per J-STD-2, LF maximun peak of 26 C Matte tin lead free plated Halogen-free and RoHS compliant Pb-free E3 means 2nd level interconnect is Pb-free and the terminal finish material is tin(sn (IPC/ JEDEC J-STD- 69A.1 Functional Diagram Bi-directional Applications Cathode Uni-directional Anode SMF devices are ideal for the protection of I/O interfaces, V CC bus and other vulnerable circuit used in cellular phones, portable devices, business machines, power supplies and other consumer applications. Additional Infomarion Datasheet Resources Samples
Electrical Characteristics (T A =25 C unless otherwise noted Part Number Marking Code Breakdown Voltage V BR (Volts @ I T MIN MAX Test Current I T (ma Reverse Stand off Voltage V R (V Maximum Reverse Leakage @ V R I R (µa Maximum Peak Pulse Current I pp (A Maximum Clamping Voltage @I pp V C (V Agency Approval SMF5.A AE 6.4 7. 1 5. 4 21.7 9.2 X SMF6.A AG 6.67 7.37 1 6. 4 19.4 1.3 X SMF6.5A AK 7.22 7.98 1 6.5 25 17.9 11.2 X SMF7.A AM 7.78 8.6 1 7. 1 16.7 12. X SMF7.5A AP 8.33 9.21 1 7.5 5 15.5 12.9 X SMF8.A AR 8.89 9.83 1 8. 25 14.7 13.6 X SMF8.5A AT 9.44 1.4 1 8.5 1 13.9 14.4 X SMF9.A AV 1. 11.1 1 9. 5 13. 15.4 X SMF1A AX 11.1 12.3 1 1 2.5 11.8 17. X SMF11A AZ 12.2 13.5 1 11 2.5 11. 18.2 X SMF12A BE 13.3 14.7 1 12 2.5 1.1 19.9 X SMF13A BG 14.4 15.9 1 13 1. 9.3 21.5 X SMF14A BK 15.6 17.2 1 14 1. 8.6 23.2 X SMF15A BM 16.7 18.5 1 15 1. 8.2 24.4 X SMF16A BP 17.8 19.7 1 16 1. 7.7 26. X SMF17A BR 18.9 2.9 1 17 1. 7.2 27.6 X SMF18A BT 2. 22.1 1 18 1. 6.8 29.2 X SMF2A BV 22.2 24.5 1 2 1. 6.2 32.4 X SMF22A BX 24.4 26.9 1 22 1. 5.6 35.5 X SMF24A BZ 26.7 29.5 1 24 1. 5.1 38.9 X SMF26A CE 28.9 31.9 1 26 1. 4.8 42.1 X SMF28A CG 31.1 34.4 1 28 1. 4.4 45.4 X SMF3A CK 33.3 36.8 1 3 1. 4.1 48.4 X SMF33A CM 36.7 4.6 1 33 1. 3.8 53.3 X SMF36A CP 4. 44.2 1 36 1. 3.4 58.1 X SMF4A CR 44.4 49.1 1 4 1. 3.1 64.5 X SMF43A CT 47.8 52.8 1 43 1. 2.9 69.4 X SMF45A CV 5. 55.3 1 45 1. 2.8 72.7 X SMF48A CX 53.3 58.9 1 48 1. 2.6 77.4 X SMF51A CZ 56.7 62.7 1 51 1. 2.4 82.4 X SMF54A DE 6. 66.3 1 54 1. 2.3 87.1 X SMF58A RG 64.4 71.2 1 58 1. 2.1 93.6 SMF6A RK 66.7 73.7 1 6 1. 1.8 96.8 SMF64A RM 71.1 78.6 1 64 1. 1.7 13. SMF7A RP 77.8 86. 1 7 1. 1.5 113. SMF75A RR 83.3 92.1 1 75 1. 1.4 121. SMF78A RT 86.7 95.8 1 78 1. 1.4 126. SMF85A RV 94.4 14. 1 85 1. 1.3 137. SMF9A RW 1. 111. 1 9 1. 1.2 146. SMF1A RX 111. 123. 1 1 1. 1.1 162. Notes: 1. V BR measured after I T applied for 3µs, I T = square wave pulse or equivalent. 2. Surge current waveform per 1/1µs exponential wave and derated per Fig.2. 3. All terms and symbols are consistent with ANSI/IEEE C62.35.
I-V Curve Characteristics Uni-directional Vc VBR VR IR IT VF V Ipp P PPM Peak Pulse Power Dissipation -- Max power dissipation V R Stand-off Voltage -- Maximum voltage that can be applied to the TVS without operation V BR Breakdown Voltage -- Maximum voltage that flows though the TVS at a specified test current (I T V C Clamping Voltage -- Peak voltage measured across the TVS at a specified Ippm (peak impulse current I R V F Reverse Leakage Current -- Current measured at V R Forward Voltage Drop for Uni-directional Ratings and Characteristic Curves (T A =25 C unless otherwise noted Figure 1 - TVS Transients Clamping Waveform Figure 2 - Peak Pulse Power Rating Curve Voltage Transients 1 Voltage or Current Voltage Across TVS Current Through TVS P PPM -Peak Pulse Power (kw 1 Time.1.1.1.1.1 t d -Pulse Width (sec. continues on next page.
Ratings and Characteristic Curves (T A =25 C unless otherwise noted (Continued Figure 3 - Peak Pulse Power Derating Curve Figure 4 - Pulse Waveform - 1/1µS Peak Pulse Power (P PP or Current (I PP Derating in Percentage % 1 8 6 4 2 25 5 75 1 125 15 175 T J - Initial Junction Temperature (ºC I PPM - Peak Pulse Current, % I RSM 15 1 5 td tr=1µsec Peak Value IPPM Half Value IPPM 2 IPPM ( TJ=25 C Pulse Width(td is defined as the point where the peak current decays to 5% of IPPM 1/1µsec. Waveform as defined by R.E.A 1. 2. 3. 4. t-time (ms Figure 5 - Forward Voltage Figure 6 - Typical Junction Capacitance.9 1 V f - Typical forward dropped voltage.8.7.6.5.4-55 1 75 14 C j (pf 1 1 Measured@5%Vr Measured@Vr=v Temperature (ºC Figure 7 - Peak Forward Voltage Drop vs. Peak Forward Current Figure 1 8 - Maximum Non-Repetitive Forward Surge 1 Current Uni-Directional 1 Only 1 35 V br - Reverse breakdown voltage I F -Peak Forward Current(A 1 1.1.1.5 1 1.5 2 2.5 3 3.5 4 V F -Peak Forward Voltage(V IFSM - Peak Forward Surve Current(A 3 25 2 15 1 5 1 1 1 Number of Cycles at 6 Hz
Temperature (T Transient Voltage Suppression Diodes Soldering Parameters Reflow Condition Lead free assembly Pre Heat - Temperature Min (T s(min 15 C - Temperature Max (T s(max 2 C - Time (min to max (t s 6 18 secs Average ramp up rate (Liquidus Temp (T A to peak T S(max to T A - Ramp-up Rate Reflow - Temperature (T A (Liquidus 217 C 3 C/second max 3 C/second max - Time (min to max (t s 6 15 seconds Peak Temperature (T P 26 +/-5 C Time within 5 C of actual peak Temperature (t p 2 4 seconds Ramp-down Rate 6 C/second max Time 25 C to peak Temperature (T P 8 minutes Max. Do not exceed 26 C T P T L T s(max T s(min 25 C Environmental Specifications High Temp. Storage t s Preheat t 25 C to Peak Ramp-up Time (t t p JESD22-A13 t L Critical Zone T L to T P Ramp-down Physical Specifications Case Polarity Terminal SOD-123FL plastic over glass passivated junction Color band denotes cathode except bipolar Matte tin-plated leads, solderable per JESD22-B12 HTRB JESD22-A18 Temperature Cycling JESD22-A14 MSL JEDEC-J-STD-2, Level 1 H3TRB JESD22-A11 RSH JESD22-A111 Dimensions - SOD-123FL Package C D G H A B E E F Dimensions Millimeters Inches Min Max Min Max A 2.5 2.9.984.1142 B 3.4 3.9.1339.1535 C.7 1.2.275.472 D 1.5 2..591.787 E.35.9.138.354 F.5.26.2.12 G..1..39 H.95 1.1.374.433 Mounting Pad Layout 1.6 (.62 1.3 (.51 1.4 (.55
Part Numbering System Part Marking System SMF xx A 5% V BR VOLTAGE TOLERANCE V R VOLTAGE LF XX YM Cathode Band (for uni-directional products only Marking Code Trace Code Marking Y:Year Code M: Month Code SERIES Packaging Options Part number Component Package Quantity Packaging Option Packaging Specification SMFXXX SOD-123FL 3 Tape & Reel 8mm tape/7 reel EIA RS-481 SMFXXX-T13 SOD-123FL 1 Tape & Reel 8mm tape/13 reel EIA RS-481 Tape and Reel Specification.31 (8..157 (4. Cathode.157 (4..59 DIA (1.5 Cover tape.8 (2.2 Arbor Hole Dia. 7. (178 Dimensions are in inches (and millimeters..33 (8.5 Direction of Feed Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.