Datasheet > 1N4732DRL2

1N4732DRL2

更新时间： 2023-02-15 00:00:00

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		/
页数	文件大小	规格书
8页	82K
描述
4.7V, 1W, SILICON, UNIDIRECTIONAL VOLTAGE REGULATOR DIODE, DO-41, GLASS, CASE 59-03, 2 PIN

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1N4732DRL2 数据手册

GENERAL DATA — 500 mW DO-35 GLASS

APPLICATION NOTE

Since the actual voltage available from a given zener diode

temperature and may be found as follows:

is temperature dependent, it is necessary to determine junc-

tiontemperatureunderanysetofoperatingconditionsinorder

to calculate its value. The following procedure is recom-

mended:

∆T = θ P .

JL JL D

may be determined from Figure 3 for dc power condi-

tions. For worst-case design, using expected limits of I , limits

ofP andtheextremesofT (∆T )maybeestimated.Changes

Lead Temperature, T , should be determined from:

in voltage, V , can then be found from:

T = θ

LA D

+ T .

∆V = θ

∆T .

, the zener voltage temperature coefficient, is found from

isthelead-to-ambientthermalresistance(°C/W)andP is

Figure 2.

Under high power-pulse operation, the zener voltage will

the power dissipation. The value forθ willvaryanddepends

onthedevicemountingmethod.θ isgenerally30to40°C/W

for the various clips and tie points in common use and for

printed circuit board wiring.

vary with time and may also be affected significantly by the

zenerresistance. Forbestregulation, keepcurrentexcursions

as low as possible.

Surge limitations are given in Figure 5. They are lower than

would be expected by considering only junction temperature,

as current crowding effects cause temperatures to be ex-

tremely high in small spots, resulting in device degradation

should the limits of Figure 5 be exceeded.

The temperature of the lead can also be measured using a

thermocoupleplacedontheleadascloseaspossibletothetie

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 mea-

sured value of T , the junction temperature may be deter-

mined by:

T = T + ∆T .

∆T is the increase in junction temperature above the lead

Motorola TVS/Zener Device Data

500 mW DO-35 Glass Data Sheet

6-118

1 2 345 6 7 8

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