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PDF MZP4736A Data sheet ( Hoja de datos )

Número de pieza MZP4736A
Descripción 3 Watt DO-41 Surmetic 30 Zener Voltage Regulators
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MZP4729A Series
3 Watt DO-41 SurmeticE 30
Zener Voltage Regulators
This is a complete series of 3 Watt Zener diodes with limits and
excellent operating characteristics that reflect the superior capabilities
of silicon–oxide passivated junctions. All this in an axial–lead,
transfer–molded plastic package that offers protection in all common
environmental conditions.
Specification Features:
Zener Voltage Range – 3.6 V to 30 V
ESD Rating of Class 3 (>16 KV) per Human Body Model
Surge Rating of 98 W @ 1 ms
Maximum Limits Guaranteed on up to Six Electrical Parameters
Package No Larger than the Conventional 1 Watt Package
Mechanical Characteristics:
CASE: Void free, transfer–molded, thermosetting plastic
FINISH: All external surfaces are corrosion resistant and leads are
readily solderable
MAXIMUM LEAD TEMPERATURE FOR SOLDERING PURPOSES:
230°C, 1/16from the case for 10 seconds
POLARITY: Cathode indicated by polarity band
MOUNTING POSITION: Any
MAXIMUM RATINGS
Rating
Max. Steady State Power Dissipation
@ TL = 75°C, Lead Length = 3/8
Derate above 75°C
Steady State Power Dissipation
@ TA = 50°C
Derate above 50°C
Operating and Storage
Temperature Range
Symbol
PD
PD
TJ, Tstg
Value
3
24
1
6.67
–65 to
+200
Unit
W
mW/°C
W
mW/°C
°C
http://onsemi.com
Cathode
Anode
AXIAL LEAD
CASE 59
PLASTIC
MARKING DIAGRAM
L
MZP4
7xxA
YYWW
L = Assembly Location
MZP47xxA = Device Code
= (See Table Next Page)
YY = Year
WW = Work Week
ORDERING INFORMATION
Device
Package
Shipping
MZP47xxA
Axial Lead 2000 Units/Box
MZP47xxARL
Axial Lead 6000/Tape & Reel
MZP47xxATA
Axial Lead 4000/Ammo Pack
MZP47xxARR1 { Axial Lead 2000/Tape & Reel
MZP47xxARR2 } Axial Lead 2000/Tape & Reel
{ Polarity band up with cathode lead off first
} Polarity band down with cathode lead off first
© Semiconductor Components Industries, LLC, 2002
February, 2002 – Rev. 2
1
Publication Order Number:
MZP4729A/D

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MZP4736A pdf
MZP4729A 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 = θLA PD + 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
30–40°C/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:
TJ = TL + TJL
TJL is the increase in junction temperature above the lead
temperature and may be found from Figure 2 for a train of
power pulses (L = 3/8 inch) or from Figure 10 for dc power.
TJL = θJL PD
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 = θVZ TJ
θVZ, the zener voltage temperature coefficient, is found
from Figures 5 and 6.
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.
Data of Figure 2 should not be used to compute surge
capability. Surge limitations are given in Figure 3. 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 3 be exceeded.
http://onsemi.com
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