Product specification 1SMA5945 DO-214AC(SMA) ■ Features Unit: mm 4.32 4.12 4.597 3.988 ● ESD Rating of Class 3 (＞16 kV) per Human Body Model 2.126 1.397 ● Flat Handling Surface for Accurate Placement 1 2 2.896 2.489 2.22 2.02 ● Low Profile Package 2.75 2.55 5.87 5.67 5.668 4.925 ● Pb-Free Packages are Available ● Maximum Lead Temperature for Soldering Purposes Recommended Land Pattern 2.438 1.981 for 10 seconds: 260 ℃ 1.524 0.762 0.203 0.051 0.305 0.152 ■ Absolute Maximum Ratings Ta = 25℃ Parameter Symbol DC Power Dissipation @ TL = 75℃ * Rating Unit 1.5 W PD Derate above 75℃ DC Power Dissipation @ TA = 25℃ * PD Derate above 25℃ 20 mW/℃ 0.5 W 4.0 mW/℃ Thermal Resistance, Junction-to-Ambient R èJA 250 ℃/W Thermal Resistance, Junction-to-Lead R èJLL 50 ℃/W TJ, Tstg -65 to +150 ℃ Operating and Storage Temperature Range * FR4 Board, using Motorola minimum recommended footprint, as shown in case 403B outline dimensions spec. ■ Electrical Characteristics (TA = 25℃ unless otherwise noted, VF = 1.5 V Max. @ IF = 200 mA for all types) Zener Voltage *2 VZ (Volts) Device *1 Min 1SMA5945 Nom 68 64.60 Max 71.40 Zener Impedance @IZT ZZT @ IZT mA Ω 5.5 120 Leakage Current ZZK @ IZK IZM IR @ VR Ω mA μA Volts 1700 0.25 1.0 51.7 mA(dc) 22 *1 Tolerance and Voltage Regulation Designation The type number listed indicates a tolerance of ±5%. *2 VZ limits are to be guaranteed at thermal equilibrium. ■ Marking Marking 1SMA5945 http://www.twtysemi.com [email protected] 4008-318-123 1 of 3 Product specification 1SMA5945 Typical Characteristics PD, MAXIMUM POWER DISSIPATION (WATTS) 4 100 IZ, ZENER CURRENT (mA) 3.2 2.4 TL 1.6 10 1 0.8 TA 0 0 25 50 75 100 T, TEMPERATURE (°C) 125 150 0.1 0 2 Figure 1. Steady State Power Derating θVZ , TEMPERATURE COEFFICIENT (mV/° C) IZ, ZENER CURRENT (mA) 10 1 0.1 10 20 30 40 50 60 VZ, ZENER VOLTAGE (VOLTS) 70 8 10 Figure 2. VZ − 3.3 thru 10 Volts 100 0 4 6 VZ, ZENER VOLTAGE (VOLTS) 80 10 8 VZ @ IZT 6 4 2 0 −2 −4 2 4 Figure 3. VZ = 12 thru 68 Volts 6 8 VZ, ZENER VOLTAGE (VOLTS) 10 12 Figure 4. Zener Voltage − 3.3 to 12 Volts 70 ZZ, DYNAMIC IMPEDANCE (OHMS) θVZ , TEMPERATURE COEFFICIENT (mV/° C) 100 VZ @ IZT 50 30 20 100 IZ(dc) = 1 mA 10 10 mA 20 mA 10 10 20 30 50 VZ, ZENER VOLTAGE (VOLTS) 70 100 Figure 5. Zener Voltage − 12 to 68 Volts http://www.twtysemi.com [email protected] IZ(rms) = 0.1 IZ(dc) 10 100 VZ, ZENER VOLTAGE (VOLTS) Figure 6. Effect of Zener Voltage 4008-318-123 2 of 3 Product specification 1SMA5945 10 1000 MEASURED @ VZ/2 100 NONREPETITIVE, EXPONENTIAL PULSE WAVEFORM, TJ = 25°C Ppk , PEAK POWER (kW) C, CAPACITANCE (pF) MEASURED @ ZERO BIAS 1 0.1 TJ = 25°C 10 10 BREAKDOWN VOLTAGE (VOLTS) 0.01 100 0.01 Figure 7. Capacitance Curve PEAK VALUE Ippm 60 10/1000 ms WAVEFORM AS DEFINED BY R.E.A. 20 0 0.9 IPEAK HALF VALUE − Ipp/2 40 80 60 0.5 IPEAK 40 20 td 0 8/20 ms WAVEFORM AS DEFINED BY ANSI C62.1 AND IEC 801−5. 100 CURRENT (%) 100 80 120 TA = 25°C PW (ID) IS DEFINED AS THE POINT WHERE THE PEAK CURRENT DECAYS TO 50% OF Ipp. ≤ 10 ms 10 Figure 8. Typical Pulse Rating Curve Ippm, PEAK PULSE Ippm, PEAK PULSE CURRENT (%) 120 0.1 1 TP, PULSE WIDTH (ms) 0.1 IPEAK 1 2 3 t, TIME (ms) 4 5 Figure 9. Pulse Waveform http://www.twtysemi.com [email protected] T = 8 ms 0 0 0.02 T 20 ms 0.04 0.06 t, TIME (ms) 0.08 0.1 Figure 10. Pulse Waveform 4008-318-123 3 of 3