Licensed by ON Semiconductor, A trademark of semiconductor Components Industries, LLC for Zener Technology and Products. TAK CHEONG 1 Watt DO-41 Hermetically Sealed Glass Zener Voltage Regulators Maximum Ratings Rating Symbol Value Units Maximum Steady State Power Dissipation @TL50, Lead Length = 3/8" PD 1 W 6.67 mW/ -65 to +200 C Derate Above 50 Operating and Storage Temperature Range TJ, Tstg Specification Features: Zener Voltage Range = 3.3V to 100V ESD Rating of Clas 3 (>6 KV) per Human Body Model DO-41 Package (DO-204AL) Double Slug Type Construction Metallurgical Bonded Construction Cathode Anode Oxide Passivated Die Specification Features: Case : Double slug type, hermetically sealed glass Finish : All external surfaces are corrosion resistant and leads are readily solderable Polarity : Cathode indicated by polarity band Mounting: Any Maximum Lead Temperature for Soldering Purposes 230, 1/16" from the case for 10 seconds L 1N 47 xx A L 1N47xxA = Logo = Device Code Ordering Information Device Package Quantity 1N47xxA Axial Lead 2000 Units / Box 1N47xxARL Axial Lead 6000 Units / Tape & Reel 1N47xxARL2* Axial Lead 6000 Units / Tape & Reel 1N47xxATA Axial Lead 4000 Units / Tape & Ammo 1N47xxATA2* Axial Lead 4000 Units / Tape & Ammo * The "2" suffix refer to 26mm tape spacing. Devices listed in bold italic are Tak Cheong Preferred devices. Preferred devices are recommended choices for future use and best overall value. December 2005 / B http://takcheong.com 1 1N4728A through 1N4764A Series (R) 1N4728A through 1N4764A Series ELECTRICAL CHARACTERISTICS (TA = 25C unless otherwise noted. VF = 1.2 V Max @ IF = 200mA for all types) Symbol Parameter VZ Reverse Zener Voltage @ IZT IZT Reverse Zener Current ZZT Maximum Zener Impedance @ IZT IZk Reverse Zener Current ZZk Maximum Zener Impedance @ IZk IR Reverse Leakage Current @ VR VR Reverse Voltage IF Forward Current VF Forward Voltage @ IF Ir Surge Current @ TA = 25C ELECTRICAL CHARACTERISTICS (TA = 25C unless otherwise noted, VF = 1.2 V Max @ IF = 200mA for all types) Zener Impedance (Note 5.) Zener Voltage (Note 3 & 4.) Ir IR @ VR (Note 6.) @ IZT ZZT @ IZT Max (mA) ) ( ) ( (mA) A Max) ( (Volts) (mA) 3.3 3.465 76 10 400 1 100 1 1380 3.42 3.6 3.78 69 10 400 1 100 1 1260 1N4730A 3.705 3.9 4.095 64 9 400 1 50 1 1190 1N4731A 1N4731A 4.085 4.3 4.515 58 9 400 1 10 1 1070 1N4732A 1N4732A 4.465 4.7 4.935 53 8 500 1 10 1 970 1N4733A 1N4733A 4.845 5.1 5.355 49 7 550 1 10 1 890 1N4734A 1N4734A 5.32 5.6 5.88 45 5 600 1 10 2 810 1N4735A 1N4735A 5.89 6.2 6.51 41 2 700 1 10 3 730 1N4736A 1N4736A 6.46 6.8 7.14 37 3.5 700 1 10 4 660 1N4737A 1N4737A 7.125 7.5 7.875 34 4 700 0.5 10 5 605 1N4738A 1N4738A 7.79 8.2 8.61 31 4.5 700 0.5 10 6 550 1N4739A 1N4739A 8.645 9.1 9.555 28 5 700 0.5 10 7 500 1N4740A 1N4740A 9.5 10 10.5 25 7 700 0.25 10 7.6 454 1N4741A 1N4741A 10.45 11 11.55 23 8 700 0.25 5 8.4 414 1N4742A 1N4742A 11.4 12 12.6 21 9 700 0.25 5 9.1 380 Device VZ (Volts) Leakage Current (Note 2.) Device Marking Min Nom 1N4728A 1N4728A 3.135 1N4729A 1N4729A 1N4730A ZZK @ IZK 2. TOLERANCE AND TYPE NUMBER DESIGNATION (VZ) The type numbers listed have a standard tolerance on the nominal zener voltage of 5%. 3. SPECIALS AVAILABLE INCLUDE Nominal zener voltages between the voltages shown and tighter voltage tolerances. For detailed information on price, availability and delivery, contact your nearest Tak Cheong representative. 4. ZENER VOLTAGE (VZ) MEASUREMENT Nominal zener voltage is measured with the device junction in the thermal equilibrium at the lead temperature (TL) at 30C 1C and 3/8" lead length. 5. ZENER IMPEDANCE (ZZ) DERIVATION The zener impedance is derived from the 60 cycle AC voltage, which 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. 6. SURGE CURRENT (Ir) NON-REPETITIVE The rating listed in the electrical characteristics table is maximum peak, non-repetitive, reverse surge current of 1/2 square wave or equivalent sine wave pulse of 1/120 second duration superimposed on the test current IZT per JEDEC registration; however, actual device capability is as described in figure 5 of the General Data DO-41 Glass. http://www.takcheong.com 2 1N4728A through 1N4764A Series ELECTRICAL CHARACTERISTICS (TA = 25C unless otherwise noted, VF = 1.2 V Max @ IF = 200mA for all types) Zener Impedance (Note 10.) Zener Voltage (Note 8 & 9.) Ir IR @ VR (Note 11.) @ IZT ZZT @ IZT Max (mA) ) ( ) ( (mA) A Max) ( (Volts) (mA) 13 13.65 19 10 700 0.25 5 9.9 344 14.25 15 15.75 17 14 700 0.25 5 11.4 304 15.2 16 16.8 15.5 16 700 0.25 5 12.2 285 1N4746A 17.1 18 18.9 14 20 750 0.25 5 13.7 250 1N4747A 1N4747A 19 20 21 12.5 22 750 0.25 5 15.2 225 1N4748A 1N4748A 20.9 22 23.1 11.5 23 750 0.25 5 16.7 205 1N4749A 1N4749A 22.8 24 25.2 10.5 25 750 0.25 5 18.2 190 1N4750A 1N4750A 25.65 27 28.35 9.5 35 750 0.25 5 20.6 170 1N4751A 1N4751A 28.5 30 31.5 8.5 40 1000 0.25 5 22.8 150 1N4752A 1N4752A 31.35 33 34.65 7.5 45 1000 0.25 5 25.1 135 1N4753A 1N4753A 34.2 36 37.8 7 50 1000 0.25 5 27.4 125 1N4754A 1N4754A 37.05 39 40.95 6.5 60 1000 0.25 5 29.7 115 1N4755A 1N4755A 40.85 43 45.15 6 70 1500 0.25 5 32.7 110 1N4756A 1N4756A 44.65 47 49.35 5.5 80 1500 0.25 5 35.8 95 1N4757A 1N4757A 48.45 51 53.55 5 95 1500 0.25 5 38.8 90 1N4758A 1N4758A 53.2 56 58.8 4.5 110 2000 0.25 5 42.6 80 1N4759A 1N4759A 58.9 62 65.1 4 125 2000 0.25 5 47.1 70 1N4760A 1N4760A 64.6 68 71.4 3.7 150 2000 0.25 5 51.7 65 1N4761A 1N4761A 71.25 75 78.75 3.3 175 2000 0.25 5 56 60 1N4762A 1N4762A 77.9 82 86.1 3 200 3000 0.25 5 62.2 55 1N4763A 1N4763A 86.45 91 95.55 2.8 250 3000 0.25 5 69.2 50 1N4764A 1N4764A 95 100 105 2.5 350 3000 0.25 5 76 45 Device VZ (Volts) Leakage Current (Note 7.) Device Marking Min Nom 1N4743A 1N4743A 12.35 1N4744A 1N4744A 1N4745A 1N4745A 1N4746A ZZK @ IZK 7. TOLERANCE AND TYPE NUMBER DESIGNATION (VZ) The type numbers listed have a standard tolerance on the nominal zener voltage of 5%. 8. SPECIALS AVAILABLE INCLUDE Nominal zener voltages between the voltages shown and tighter voltage tolerances. For detailed information on price, availability and delivery, contact your nearest Tak Cheong representative. 9. ZENER VOLTAGE (VZ) MEASUREMENT Nominal zener voltage is measured with the device junction in the thermal equilibrium at the lead temperature (TL) at 30C 1C and 3/8" lead length. 10. ZENER IMPEDANCE (ZZ) DERIVATION The zener impedance is derived from the 60 cycle AC voltage, which 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. 11. SURGE CURRENT (Ir) NON-REPETITIVE The rating listed in the electrical characteristics table is maximum peak, non-repetitive, reverse surge current of 1/2 square wave or equivalent sine wave pulse of 1/120 second duration superimposed on the test current IZT per JEDEC registration; however, actual device capability is as described in figure 5 of the General Data DO-41 Glass. http://www.takcheong.com 3 P D , STEADY STATE POWER DISSIPATION (WATTS) 1N4728A through 1N4764A Series 1.25 L = LEAD LENGTH TO HEAT SINK L = 1" L = 1/8" 1 L = 3/8" 0.75 0.5 0.25 0 20 40 60 80 100 120 140 160 180 T L, LEAD TEMPERATURE (C) Figure 1. Power Temperature Derating Curve http://www.takcheong.com 4 200 1N4728A through 1N4764A Series b. Range for Units to 12 to 100 Volts 100 VZ , TEMPERATURE COEFFICIENT (mV/ C) V Z , TEMPERATURE COEFFICIENT (mV/ C) a. Range for Units to 12 Volts +12 +10 +8 +6 +4 +2 V Z @ I ZT RANGE 0 -2 -4 4 3 2 6 5 7 8 10 9 11 70 50 30 20 V Z @ I ZT RANGE 10 7 5 3 2 1 12 10 20 V Z , ZENER VOLTAGE (VOLTS) 30 50 70 100 V Z , ZENER VOLTAGE (VOLTS) +6 175 VZ , TEMPERATURE COEFFICIENT (mV/ C) JL , JUNCTION-TO-LEAD THERMAL RESISTANCE (mV/ C) Figure 2. Temperature Coefficients (-55 C to +150 C temperature range; 90% of the units are in the ranges indicated.) 150 125 100 75 50 25 0 V Z @ IZ TA = 25 C +4 +2 20 mA 0 0.01 mA 1 mA -2 NOTE: BELOW 3 VOLTS AND ABOVE 8 VOLTS NOTE: CHANGES IN ZENER CURRENT DO NOT NOTE: EFFECT TEMPERATURE COEFFICIENTS -4 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 4 3 7 6 5 8 V Z , ZENER VOLTAGE (VOLTS) L, LEAD LENGTH TO HEAT SINK (INCHES) Figure 3. Typical Thermal Resistance versus Lead Length Figure 4. Effect of Zener Current P pk , PEAK SURGE POWER (WATTA) 100 70 50 30 RECT ANGULAR WAVEFORM T J = 25C PRIOR TO INITIAL PULSE 11 V - 100 V NONREPETITIVE 5% DUTY CYCLE 3.3 V - 10 V NONREPETITIVE 20 10 10% DUTY CYCLE 7 5 20% DUTY CYCLE 3 2 1 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 10 PW, PULSE WIDTH (ms) This graph represents 90 percentile data points. For worst case design characteristics, multiply surge power by 2/3. Figure 5. Maximum Surge Power http://www.takcheong.com 5 20 50 100 200 500 1000 1N4728A through 1N4764A Series 1000 1000 700 500 T J = 25 C iZ (rms) = 0.1 IZ (dc) f = 60 Hz V Z = 2.7 V Z Z , DYNAMIC IMPEDANCE (OHMS) Z Z , DYNAMIC IMPEDANCE (OHMS) 500 200 47 V 100 27 V 50 20 10 6.2 V 5 T J = 25 C iZ (rms) = 0.1 IZ (dc) f = 60 Hz IZ = 1 mA 200 100 70 50 5 mA 20 20 mA 10 7 5 2 2 1 1 0.1 0.2 0.5 1 2 5 10 20 50 1 100 2 3 5 7 Figure 6. Effect of Zener Current on Zener Impedance 20 30 50 70 100 Figure 7. Effect of Zener Voltage on Zener Impedance 10000 7000 5000 400 300 200 TYPICAL LEAKAGE CURRENT AT 80% OF NOMINAL 2000 0 V BIAS 100 C, CAP ACIT ANCE (pF) BREAKDOWN VOLTAGE 1000 700 500 200 100 70 50 I R , LEAKAGE CURRENT ( m A) 10 V Z, ZENER VOLTAGE (V) IZ, ZENER CURRENT (mA) 1 V BIAS 50 20 10 8 50% OF BREAKDOWN BIAS 20 4 10 7 5 1 2 5 10 20 50 100 V Z , NOMINAL V Z (VOLTS) Figure 9. Typical Capacitance versus VZ 2 1 0.7 0.5 1000 +125 C I F , FOR WARD CURRENT (mA) 0.2 0.1 0.07 0.05 0.02 0.01 0.007 0.005 MINIMUM 500 +25 C MAXIMUM 200 100 50 75 C 20 10 25 C 5 150 C 0 C 2 0.002 1 0.001 3 4 5 6 7 8 9 10 11 12 13 14 15 0.4 0.5 V Z , NOMINAL ZENER VOL T AGE (VOLTS) 0.6 0.7 0.8 0.9 1 V F , FORWARD VOLTAGE (VOLTS) Figure 10. Typical Forward Characteristics Figure 8. Typical Leakage Current http://www.takcheong.com 6 1.1 1N4728A through 1N4764A Series APPLICATION NOTE Since the actual voltage available from a given zener diode is temperature dependent, it is necessary to determine junction temperature under any set of operating conditions in order to calculate its value. The following procedure is recommended: Lead Temperature, TL, should be determined from: TL = LAPD + TA. LA is the lead-to-ambient thermal resistance (C/W) and PD is the power dissipation. The value for LA will vary and depends on the device mounting method. LA is generally 30 to 40C/W for the various clips and tie points in common use and for printed circuit board wiring. The temperature of the lead can also be measured using a thermocouple placed on the lead as close as possible to the tie point. The thermal mass connected to the tie point is normally large enough so that it will not significantly respond to heat surges generated in the diode as a result of pulsed operation once steady-state conditions are achieved. Using the measured value of TL, the junction temperature may be determined by: TJL is the increase in junction temperature above the lead temperature and may be found as follows: TJL = JLPD. JL may be determined from Figure 3 for dc power conditions. For worst-case design, using expected limits of IZ, limits of PD and the extremes of TJ(TJ) may be estimated. Changes in voltage, VZ, can then be found from: V = VZ TJ. VZ, the zener voltage temperature coefficient, is found from Figure 2. Under high power-pulse operation, the zener voltage will vary with time and may also be affected significantly by the zener resistance. For best regulation, keep current excursions as low as possible. Surge limitations are given in Figure 5. They are lower than would be expected by considering only junction temperature, as current crowding effects cause temperatures to be extremely high in small spots, resulting in device degradation should the limits of Figure 5 be exceeded. TJ = TL + TJL. http://www.takcheong.com 7