TAK CHEONG Licensed by ON Semiconductor, A trademark of semiconductor Components Industries, LLC for Zener Technology and Products. 500 mW DO-35 Hermetically Sealed Glass Zener Voltage Regulators Maximum Ratings (Note 1) Rating Symbol Value Units Maximum Steady State Power Dissipation @TL75, Lead Length = 3/8" PD 500 mW 4.0 mW/ -65 to +200 C Derate Above 75 Operating and Storage Temperature Range TJ, Tstg AXIAL LEAD DO35 Note 1: Some part number series have lower JEDEC registered ratings. Specification Features: Zener Voltage Range = 2.4V to 12V ESD Rating of Clas 3 (>6 KV) per Human Body Model DO-35 Package (DO-204AH) Cathode Anode Double Slug Type Construction Metallurgical Bonded Construction Specification Features: L 43 7x A 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 L 437xA Maximum Lead Temperature for Soldering Purposes 230, 1/16" from the case for 10 seconds = Logo = 1N437xA Device Code L 7x xA Ordering Information Device Package Quantity 1NxxxxA Axial Lead 3000 Units / Box 1NxxxxARL Axial Lead 5000 Units / Tape & Reel 1NxxxxARL2* Axial Lead 5000 Units / Tape & Reel 1NxxxxARR1 ! Lead Form 3000 Units / Radial Tape & Reel 1NxxxxARR2 i Lead Form 3000 Units / Radial Tape & Reel 1NxxxxATA Axial Lead 5000 Units / Tape & Ammo 1NxxxxATA2* Axial Lead 5000 Units / Tape & Ammo 1NxxxxARA1 ! Axial Lead 3000 Units / Radial Tape & Ammo 1NxxxxARA2 i Axial Lead 3000 Units / Radial Tape & Ammo L 7xxA = Logo = 1N7xxA Device Code * The "2" suffix refer to 26mm tape spacing. ! "1": Polarity band up with cathode lead off first. i "2": Polarity band down with cathode lead off first. 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 1N4370A through 1N759A Series (R) 1N4370A through 1N759A Series ELECTRICAL CHARACTERISTICS (TA = 25C unless otherwise noted, VF = 1.5 V Max @ IF = 200mA for all types) Symbol Parameter VZ Reverse Zener Voltage @ IZT IZT Reverse Zener Current ZZT Maximum Zener Impedance @ IZT IZM Maximum DC Zener Current IR Reverse Leakage Current @ VR VR Reverse Voltage IF Forward Current VF Forward Voltage @ IF ELECTRICAL CHARACTERISTICS (TA = 25C unless otherwise noted, VF = 1.5 V Max @ IF = 200mA for all types) Zener Voltage (Note 3.) @ IZT @ IZT (Note 2.) Device Marking Min Nom Max (mA) 1N4370A 1N4370A 2.28 2.4 2.52 1N4271A 1N4271A 2.57 2.7 1N4372A 1N4372A 2.85 3 1N746A 1N746A 3.14 1N747A 1N747A 1N748A 1N749A Device VZ (Volts) IR @ VR = 1V ZZT (Note 4.) IZM TA = 25C TA = 150C ) ( (mA) A) ( A) ( 20 30 150 100 200 2.84 20 30 135 75 150 3.15 20 29 120 50 100 3.3 3.47 20 28 110 10 30 3.42 3.6 3.78 20 24 100 10 30 1N748A 3.71 3.9 4.10 20 23 95 10 30 1N749A 4.09 4.3 4.52 20 22 85 2 30 (Note 5.) 1N750A 1N750A 4.47 4.7 4.94 20 19 75 2 30 1N751A 1N751A 4.85 5.1 5.36 20 17 70 1 20 1N752A 1N752A 5.32 5.6 5.88 20 11 65 1 20 1N753A 1N753A 5.89 6.2 6.51 20 7 60 0.1 20 1N754A 1N754A 6.46 6.8 7.14 20 5 55 0.1 20 1N755A 1N755A 7.13 7.5 7.88 20 6 50 0.1 20 1N756A 1N756A 7.79 8.2 8.61 20 8 45 0.1 20 1N757A 1N757A 8.65 9.1 9.56 20 10 40 0.1 20 1N758A 1N758A 9.50 10 10.5 20 17 35 0.1 20 1N759A 1N759A 11.4 12 12.6 20 30 30 0.1 20 2. TOLERANCE AND TYPE NUMBER DESIGNATION (VZ) The type numbers listed have a standard tolerance on the nominal zener voltage of 5%. 3. 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. 4. ZENER IMPEDANCE (ZZ) DERIVATION ZZT and ZZK are measured by dividing the AC voltage drop across the device by the AC current applied. The specified limits are for IZ(AC) = 0.1 IZ(DC) with AC frequency = 60Hz. 5. MAXIMUM ZENER CURRENT RATINGS (IZM) Values shown are based on the JEDEC rating of 400mW where the actual zener voltage (VZ) is known at the operating point, the zener current may be increased and is limited by the derating curve. http://www.takcheong.com 2 1N4370A through 1N759A Series 0.7 HEAT SINKS P D , MAXIMUM STEADY STATE POWER DISSIPATION (WATTS) 0.6 0.5 0.4 3/8" 3/8" 0.3 0.2 0.1 0 0 20 40 60 80 100 120 140 160 T L , LEAD TEMPERATURE (C) Figure 1. Steady State Power Derating http://www.takcheong.com 3 180 200 1N4370A through 1N759A Series 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: JL, JUNCTION TO LEAD THERMAL RESISTANCE ( C/W) APPLICATION NOTE - ZENER VOLTAGE L 2.4-60 V 200 62-200 V 100 0 0 0.2 0.4 1000 7000 5000 0.6 0.8 1 TYPICAL LEAKAGE CURRENT AT 80% OF NOMINAL BREAKDOWN VOLTAGE 2000 1000 700 500 200 TJL = JLPD. 100 70 50 I R , LEAKAGE CURRENT ( A) VZ, the zener voltage temperature coefficient, is found from Figures 4 and 5. 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 7. 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 7 be exceeded. L 300 Figure 2. Typical Thermal Resistance TJL is the increase in junction temperature above the lead temperature and may be found from Figure 2 for dc power: V = VZTJ. 400 L , LEAD LENGTH TO HEAT SINK (INCH) TJ = TL + TJL. 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: 500 20 10 7 5 2 1 0.7 0.5 +125C 0.2 0.1 0.07 0.05 0.02 0.01 0.007 0.005 +25C 0.002 0.001 3 4 5 6 7 8 9 10 11 12 VZ , NOMINAL ZENER VOLTAGE (VOLTS) Figure 3. Typical Leakage Current http://www.takcheong.com 4 13 14 15 1N4370A through 1N759A Series TEMPERATURE COEFFICIENTS TEMPERATURE COEFFICIENT (mV/ C) +12 +10 +8 +6 +4 +2 RANGE VZ @ IZT (NOTE 2) 0 -2 VZ , VZ , TEMPERA TURE COEFFICIENT (mV/ C) (-55 C to +150 C temperature range; 90% of the units are in the ranges indicated.) -4 2 4 3 5 6 7 8 10 9 11 100 70 50 30 20 5 3 2 1 10 12 20 TEMPERATURE COEFFICIENT (mV/C) 160 140 VZ @ IZT (NOTE 2) VZ , TEMPERA TURE COEFFICIENT (mV/C) VZ , 180 100 140 150 160 170 70 100 180 190 +6 VZ @ IZ TA= 25 C +4 +2 20mA 0 0.01mA 1mA -2 NOTE: BELOW 3 VOLTS AND ABOVE 8 VOL TS NOTE: CHANGES IN ZENER CURRENT DO NOT NOTE: AFFECT TEMPERATURE COEFFICIENTS -4 3 200 6 5 4 8 7 V Z , ZENER VOLTAGE (VOLTS) V Z , ZENER VOLTAGE (VOLTS) Figure 4c. Range for Units 120 to 200 Volts Figure 5. Effect of Zener Current 1000 100 TA = 25 C 70 500 T= 25 C 50 0V BIAS 0 BIAS C, CAP ACIT ANCE (pF) 200 C, CAP ACIT ANCE (pF) 50 Figure 4b. Range for Units 12 to 100 Volts 200 130 30 V Z , ZENER VOLTAGE (VOLTS) Figure 4a. Range for Units to 12 Volts 120 (NOTE 2) 7 V Z , ZENER VOLTAGE (VOLTS) 120 VZ @ IZ RANGE 10 100 1V BIAS 50 20 10 50% OF V Z BIAS 5 30 20 1 VOLT BIAS 10 7 50% OF V BIAS 5 3 2 2 1 1 1 2 5 10 20 50 100 120 140 160 180 190 200 V Z, ZENER VOLTAGE (VOLTS) V Z, ZENER VOLTAGE (VOLTS) Figure 6a. Typical Capacitance 2.4-100 Volts Figure 6b. Typical Capacitance 120-200 Volts http://www.takcheong.com 5 220 1N4370A through 1N759A Series Ppk , PEAK SURGE POWER (WATTS) 100 70 50 RECT ANGULAR WAVEFORM T J = 25C PRIOR TO INITIAL PULSE 11V-91V NONREPETITIVE 30 5% DUTY CYCLE 1.8V-10V 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 20 50 100 200 500 1000 PW, PULSE WIDTH (ms) Figure 7a. Maximum Surge Power 1.8-91 Volts 1000 RECT ANGULAR WAVEFORM, TJ = 25 C 300 200 100 70 50 100-200 VOLTS NONREPETITIVE 30 20 10 7 5 3 2 1 0.01 T J = 25C iZ (rms) = 0.1 Iz(dc) VZ = 2.7V f = 60 Hz 200 47V 100 27V 50 20 6.2V 10 5 2 1 0.1 1 10 100 0.1 1000 0.2 0.5 1 2 5 10 20 PW, PULSE WIDTH (ms) IZ , ZENER CURRENT (mA) Figure 7b. Maximum Surge Power DO-35 100-200Volts Figure 8. Effect of Zener Current on Zener Impedance 1000 700 500 Z Z , DYNAMIC IMPEDANCE (OHMS) Z Z , DYNAMIC IMPEDANCE (OHMS) 500 TJ = 25C 200 100 70 50 5mA 20 20mA 100 MAXIMUM 500 f = 60Hz IZ = 1mA 50 1000 iZ (rms) = 0.1 IZ (dc) I F , FOR WARD CURRENT (mA) Ppk , PEAK SURGE POWER (WATTS) 1000 700 500 10 7 5 2 MINIMUM 200 100 50 75 C 20 10 25 C 5 150 C 0 C 2 1 1 1 2 3 5 7 10 20 30 50 70 100 0.4 0.5 V Z , ZENER VOLTAGE (VOLTS) 0.6 0.7 0.8 0.9 1 V F , FOR WARD VOLTAGE (VOLTS) Figure 9. Effect of Zener Voltage on Zener Impedance Figure 10. Typical Forward Characteristics http://www.takcheong.com 6 1.1 1N4370A through 1N759A Series 20 10 I Z , ZENER CURRENT (mA) TA = 25C 1 0.1 0.01 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 29 30 V Z , ZENER VOLTAGE (VOLTS) Figure 1 1. Zener Voltage versus Zener Current - VZ = 1 thru 16 Volts 10 I Z , ZENER CURRENT (mA) TA = 25C 1 0.1 0.01 15 16 17 18 19 20 21 22 23 24 25 26 27 V Z , ZENER VOLTAGE (VOLTS) Figure 12. Zener Voltage versus Zener Current - VZ = 15 thru 30 Volts http://www.takcheong.com 7 28 1N4370A through 1N759A Series I Z , ZENER CURRENT (mA) 10 TA = 25 1 0.1 0.01 30 35 40 45 50 55 60 65 70 75 80 85 95 100 105 240 250 260 90 V Z , ZENER VOLTAGE (VOLTS) Figure 13. Zener Voltage versus Zener Current - VZ = 30 thru 105 Volts I Z , ZENER CURRENT (mA) 10 1 0.1 0.01 110 120 130 140 150 160 170 180 190 200 210 220 230 V Z , ZENER VOLTAGE (VOLTS) Figure 14. Zener Voltage versus Zener Current - VZ = 110 thru 220 Volts http://www.takcheong.com 8