SMA4949A SURFACE MOUNT ZENER TYPE 2.0 Watts Surface Mount Zener Diode VOLTAGE 24V 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 MECHANICAL DATA For surface mounted applications 2.0 W power dissipation Ideally suited for automated assembly processes 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 VF VALUE Pd / Vz 1.2 UNIT mA Volts Pd 2 W RthjL 20 Rthja 80 -55 to +150 -55 to +150 SYMBOLS Zener Current(see page1) IZM Forward Voltage @ IF=200mA Max. Steady State Power Dissipation @ TL=100℃,Lead Length=1mm Typical Thermal Resistnace(Note1) Operating Temperature Range TJ Storage Temperature Range TSTG ℃/W ℃ ℃ NOTES: 1. Thermal Resistance Junction to Lead/Ambient. 2. The type number listed have a standard tolerance on the nominal zener voltage of ± 5% Maximum Zener Nominal Zener Voltage ZENER 2W SERIES SMA4949 www.paceleader.tw VZ@IZT (V) 24 ZZT@IZ ZZK@IZ (mA) (Ω) (Ω) 20.8 13 750 IZT Maximum Reverse Leakage Current Maximum DC Zener Current IR@VR IZM IZK 1 (mA) (uA) (V) (mA) 0.25 0.5 18.2 76 SMA4949A SURFACE MOUNT ZENER TYPE VOLTAGE 24V 2.0 Watts Surface Mount Zener Diode Vz TEMPERATURE COEFFICIENT (mV/℃) PM (AV) AVE PAGE POWER DISSIPATION (W) FIG. 1- MAXIMUM CONTINUOUS POWER DISSIPATION 2.0 1.5 1.0 0.5 0.0 25 50 75 100 125 150 FIG. 2-TYPICAL TEMPERATURE COEFFICIENTS 50 40 30 20 10 0 0 5 10 15 175 LEAD TEMPERATURE (℃) FIG. 3 - TYPICAL FORWARD CHARACTERISTICS INSTANTANEOUS FORWARD CURRENT ,(A) 100 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 20 25 30 Vz, ZENER VOLTAGE (V) 2 35 40