1N4728A thru 1N4751A Transient Voltage Suppressor Breakdown Voltage 3.3 to 30 Volts Features CASE: DO-204AL (DO-41) Extensive Voltages selection from 3.3 to 30V Silicon 1.0 Watt Zener Diodes Hermetically sealed glass body construction Application Voltage stabilization Regulates voltage over a broad operating current and temperature range Flexible axial-lead mounting terminals Mechanical Data Case: Void-free transfer molded thermosetting epoxy body meeting UL94V-O Terminals: Tin-Lead or ROHS Compliant annealed matte-Tin plating readily solderable per MIL-STD-750, Method 2026 Marking: Part number Polarity: Cathode indicated by band Weight: 0.3gApproximately Dimensions in inches and (millimeters) Maximum Ratings and Electrical Characteristics @ Symbol 25OC unless otherwise specified Value Unit Steady state power at TL 95 0.375"(10mm) from body 1.0 W Steady state power at TA 35 when mounted on FR4 PC described for thermal resistance (also see Fig.1) 1.0 W Maximum instantaneous forward voltage at 200mA 1.2 V RJL Thermal resistance junction to lead 80 /W RJA Thermal resistance junction to ambient 140 /W -65 to +175 PM(AV) VF TJ, TSTG Conditions Operating and Storage Temperature Document Number: 1N4728A thru 1N4751A Feb.29, 2012 www.smsemi.com 1 1N4728A thru 1N4751A Electrical Characteristics @ 25C (Unless Otherwise Noted) JEDEC Type Number (Note1) 1N4728A 1N4729A 1N4730A 1N4731A 1N4732A 1N4733A 1N4734A 1N4735A 1N4736A 1N4737A 1N4738A 1N4739A 1N4740A 1N4741A 1N4742A 1N4743A 1N4744A 1N4745A 1N4746A 1N4747A 1N4748A 1N4749A 1N4750A 1N4751A Zener Voltage VZ @ IZT (Note4) Test Current Maximum Dynamic Impedance (Note2) ZZT @ IZT Maximum Knee Impedance ZZk @ IZk Maximum Regulator Current TA=50C Knee Current VZ (V) IZT (mA) ZZT (Ohms) ZZK (Ohms) IZM (mA) IZK (mA) IR (A) VR (V) Izsm (mA) 3.3 3.6 3.9 4.3 4.7 5.1 5.6 6.2 6.8 7.5 8.2 9.1 10.0 11.0 12.0 13.0 15.0 16.0 18.0 20.0 22.0 24.0 27.0 30.0 76.0 69.0 64.0 58.0 53.0 49.0 45.0 41.0 37.0 34.0 31.0 28.0 25.0 23.0 21.0 19.0 17.0 15.5 14.0 12.5 11.5 10.5 9.5 8.5 10.0 10.0 9.0 9.0 8.0 7.0 5.0 2.0 3.5 4.0 4.5 5.0 7.0 8.0 9.0 10.0 14.0 16.0 20.0 22.0 23.0 25.0 35.0 40.0 400 400 400 400 500 550 600 700 700 700 700 700 700 700 700 700 700 700 750 750 750 750 750 1000 276 252 234 217 193 178 162 146 133 121 110 100 91 83 76 69 61 57 50 45 41 38 34 30 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 0.50 0.50 0.50 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 100 100 50 10 10 10 10 10 10 10 10 10 10 5 5 5 5 5 5 5 5 5 5 5 1.0 1.0 1.0 1.0 1.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 7.6 8.4 9.1 9.9 11.4 12.2 13.7 15.2 16.7 18.2 20.6 22.8 1380 1260 1190 1070 970 890 810 730 660 605 550 500 454 414 380 344 304 285 250 225 205 190 170 150 Maximum Reverse Current IR @ VR Maximum Surge Current (Note3) Note: 1. The JEDEC type numbers shown with an A suffix have a 5% tolerance on nominal zener voltage. No suffix signifies a 10% tolerance, C signifies 2%, and D signifies 1% tolerance. 2. The Zener impedance is derived from the 60 HZ ac voltage that results when an ac current having an rms value equal to 10% of the dc Zener current (IZT or IZK ) is superimposed on IZT or IZK. Zener impedance is measured at two points to ensure a sharp knee on the breakdown curve and eliminate unstable units. 3. The reverse surge current is measured at 25C ambient using a 1/2 square wave or equivalent sine wave pulse 1/120 second duration superimposed on IZT. 4. Zener voltage (VZ) is measured at TL=25C (+8,-2C) and 90 seconds after application of dc current. Document Number: 1N4728A thru 1N4751A Feb.29, 2012 www.smsemi.com 2 1N4728A thru 1N4751A Characteristic Curve 104 0.75 C J- Junction Capacitance (pF) Rated Power Dissipation (W) 1.00 TL 0.50 TA 0.25 0 0 50 100 150 Lead or Ambient Temperature () 200 1N4734A (5.6V) 1N4742A (12V) 1N4746A (18V) 10 0.1 1.0 10 VR - Reverse Voltage (V) 100 Fig.2 Capacitance vs. Voltage for Representative Types 100 Temperature Coefficient mV/ 1N4751A (30V) 102 Fig.1 Power Derating Curve 75 50 25 0 1N4730A (3.9V) 103 0 25 50 Nominal Zener Voltage (V) 75 100 Fig.3 Temp Coefficient vs. Zener Voltage Document Number: 1N4728A thru 1N4751A Feb.29, 2012 www.smsemi.com 3