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| SMA4949A SURFACE MOUNT ZENER TYPE VOLTAGE 24V 2.0 Watts Surface Mount Zener Diode SMA/DO-214AC .055(1.40) .062(1.60) .098(2.50) .114(2.90) .157(4.00) .181(4.60) .006(.152) .012(.305) .078(2.00) .096(2.44) .030(0.76) .060(1.52) .004(.102) .008(.203) .188(4.80) .208(5.28) Dimensions in inches and (millimeters) FEATURES For surface mounted applications 2.0 W power dissipation Ideally suited for automated assembly processes MECHANICAL DATA Case: Molded plastic Epoxy: UL 94V-0 rate flame retardant Terminals:Solderable per MIL-STD-750 method 2026 Polarity: Cathode band Mounting position: Any MAXIMUM RATINGS (at TA=25 C unless otherwise noted) o Rating 25 ambient temperature unless otherwise specified. Single phase half wave, 60Hz, resistive or inductive load. For capacitive load, derate current by 20. CHARACTERISTICS Zener Current(see page1) Forward Voltage @ IF=200mA Max. Steady State Power Dissipation @ TL=100,Lead Length=1mm Typical Thermal Resistnace(Note1) Operating Temperature Range Storage Temperature Range NOTES: 1. Thermal Resistance Junction to Lead/Ambient. 2. The type number listed have a standard tolerance on the nominal zener voltage of 5% Nominal Zener Voltage ZENER 2W SERIES VZ@IZT (V) SMA4949 24 IZT (mA) 20.8 ZZT@IZ () 13 Maximum Zener ZZK@IZ () 750 IZK (mA) 0.25 (uA) 0.5 Maximum Reverse Leakage Current IR@VR (V) 18.2 Maximum DC Zener Current IZM (mA) 76 SYMBOLS IZM VF Pd RthjL Rthja TJ TSTG VALUE Pd / Vz 1.2 2 20 80 -55 to +150 -55 to +150 UNIT mA Volts W /W www.paceleader.tw 1 SMA4949A SURFACE MOUNT ZENER TYPE VOLTAGE 24V 2.0 Watts Surface Mount Zener Diode FIG. 1- MAXIMUM CONTINUOUS POWER DISSIPATION PM (AV) AVE PAGE POWER DISSIPATION (W) Vz TEMPERATURE COEFFICIENT (mV/) 2.0 FIG. 2-TYPICAL TEMPERATURE COEFFICIENTS 50 40 30 20 10 0 0 5 10 15 20 25 30 35 40 Vz, ZENER VOLTAGE (V) 1.5 1.0 0.5 0.0 25 50 75 100 125 150 175 LEAD TEMPERATURE () FIG. 3 - TYPICAL FORWARD CHARACTERISTICS 100 INSTANTANEOUS FORWARD CURRENT ,(A) 10 1 Tj=25 Pulse Width 300us 2% Duty Cycle 0.1 0.5 0.7 0.9 1.1 1.3 1.5 INSTANTANEOUS FORWARD COLTAGE , VOLTS www.paceleader.tw 2 |
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