BZX79C51 Datasheet | Motorola Semiconductor

Features : - plete Voltage Range - 1.8 to 200 Volts - DO-204AH Package - Smaller than Conventional DO-204AA Package - Double Slug Type Construction - Metallurgically Bonded Construction Mechanical Characteristics: CASE: Double slug type, hermetically sealed glass MAXIMUM LEAD TEMPERATURE FOR SOLDERING PURPOSES: 230°C, 1/16″ from case for 10 seconds FINISH: All external surfaces are corrosion resistant with readily solderable leads POLARITY: Cathode indicated by color band. When operated in zener mode, cathode will be positive with respect to anode MOUNTING POSITION: Any WAFER FAB LOCATION: Phoenix, Arizona ASSEMBLY/TEST LOCATION: Seoul, Korea MAXIMUM RATINGS (Motorola Devices)- Rating DC Power Dissipation and TL ≤ 75°C Lead Length = 3/8″ Derate above TL = 75°C Operating and Storage Temperature Range - Some part number series have lower JEDEC registered ratings. CASE 299 DO-204AH GLASS Symbol PD Value 500 4 Unit m W m W/°C °C TJ, Tstg - 65 to +200 PD , MAXIMUM POWER DISSIPATION (WATTS) 0.7 0.6 0.5 0.4 3/8” 3/8” HEAT SINKS 0.3 0.2 0.1 0 0 20 40 60 80 100 120 140 160 180 200 TL, LEAD TEMPERATURE (°C) Figure 1. Steady State Power Derating Motorola TVS/Zener Device Data 500 m W DO-35 Glass Data Sheet 6-97 GENERAL DATA - 500 m W DO-35 GLASS APPLICATION NOTE - ZENER VOLTAGE 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 remended: Lead Temperature, TL, should be determined from: TL = θLAPD + TA. θLA is the lead-to-ambient thermal resistance (°C/W) and PD is the power dissipation. The value for θLA will vary and depends on the device mounting method. θLA is generally 30 to 40°C/W for the various clips and tie points in mon 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...