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参数资料
| 型号： | 1N4746ADRL |
| 厂商： | MOTOROLA INC |
| 元件分类： | 齐纳二极管 |
| 英文描述： | 18 V, 1 W, SILICON, UNIDIRECTIONAL VOLTAGE REGULATOR DIODE, DO-41 |
| 文件页数： | 5/6页 |
| 文件大小： | 55K |
| 代理商： | 1N4746ADRL |
GENERAL DATA — 500 mW DO-35 GLASS
Motorola TVS/Zener Device Data
6-5
500 mW DO-35 Glass Data Sheet
APPLICATION NOTE
Since the actual voltage available from a given zener diode
is temperature dependent, it is necessary to determine junc-
tion temperature under any set of operating conditions in order
to calculate its value. The following procedure is recom-
mended:
Lead Temperature, TL, should be determined from:
TL = θLAPD + TA.
θLAisthelead-to-ambientthermalresistance(°C/W)andPDis
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 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 mea-
sured value of TL, the junction temperature may be deter-
mined by:
TJ = TL + TJL.
TJL is the increase in junction temperature above the lead
temperature and may be found as follows:
TJL = θJLPD.
θJL may be determined from Figure 3 for dc power condi-
tions. 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
Figure 2.
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.
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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 1N4746AE3/TR13 | 功能描述:DIODE ZENER 18V 1W DO204AL 制造商:microsemi corporation 系列:- 包装:带卷（TR） 零件状态:有效 电压 - 齐纳（标称值）（Vz）:18V 容差:±5% 功率 - 最大值:1W 阻抗（最大值）（Zzt）:20 欧姆 不同?Vr 时的电流 - 反向漏电流:5μA @ 13.7V 不同 If 时的电压 - 正向（Vf）:1.2V @ 200mA 工作温度:-65°C ~ 150°C 安装类型:通孔 封装/外壳:DO-204AL，DO-41，轴向 供应商器件封装:DO-204AL（DO-41） 标准包装:5,000 |
| 1N4746AF | 制造商:Fairchild Semiconductor 功能描述:1N4746AF |
| 1N4746AG | 功能描述:Zener Diode 制造商:microsemi corporation 系列:* 零件状态:在售 标准包装:1 |
| 1N4746A-G _AY _10001 | 制造商:PanJit Touch Screens 功能描述: |
| 1N4746A-G_ R2 _10001 | 制造商:PanJit Touch Screens 功能描述: |
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