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參數(shù)資料
| 型號： | 1N974DTA |
| 廠商： | MOTOROLA INC |
| 元件分類： | 齊納二極管 |
| 英文描述： | 36 V, 0.5 W, SILICON, UNIDIRECTIONAL VOLTAGE REGULATOR DIODE, DO-204AH |
| 文件頁數(shù)： | 11/18頁 |
| 文件大小： | 185K |
| 代理商： | 1N974DTA |
GENERAL DATA — 500 mW DO-35 GLASS
Motorola TVS/Zener Device Data
6-98
500 mW DO-35 Glass Data Sheet
APPLICATION NOTE — ZENER VOLTAGE
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 from Figure 2 for dc power:
TJL = θJLPD.
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 = θVZTJ.
θVZ, the zener voltage temperature coefficient, is found from
Figures 4 and 5.
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 7. 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 7 be exceeded.
LL
500
400
300
200
100
0
0.2
0.4
0.6
0.8
1
2.4–60 V
62–200 V
L, LEAD LENGTH TO HEAT SINK (INCH)
JL
,JUNCTION-T
O-LEAD
THERMAL
RESIST
ANCE
(
C/W)
θ
°
Figure 2. Typical Thermal Resistance
TYPICAL LEAKAGE CURRENT
AT 80% OF NOMINAL
BREAKDOWN VOLTAGE
+25
°C
+125
°C
1000
7000
5000
2000
1000
700
500
200
100
70
50
20
10
7
5
2
1
0.7
0.5
0.2
0.1
0.07
0.05
0.02
0.01
0.007
0.005
0.002
0.001
34
5
6
7
8
9
10
11
12
13
14
15
VZ, NOMINAL ZENER VOLTAGE (VOLTS)
I
,LEAKAGE
CURRENT
(
A
)
R
Figure 3. Typical Leakage Current
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 1N975 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:SILICON PLANAR ZENER DIODES |
| 1N975A | 制造商:Microsemi Corporation 功能描述:ZENER SGL 39V 10% 500MW 2PIN DO-35 - Bulk 制造商:Microsemi Corporation 功能描述:DIODE ZENER 39V 500MW DO-7 |
| 1N975B | 功能描述:穩(wěn)壓二極管 Zener Diode RoHS:否 制造商:Vishay Semiconductors 齊納電壓:12 V 電壓容差:5 % 電壓溫度系數(shù):0.075 % / K 齊納電流: 功率耗散:3 W 最大反向漏泄電流:3 uA 最大齊納阻抗:7 Ohms 最大工作溫度:+ 150 C 安裝風格:SMD/SMT 封裝 / 箱體:DO-214AC 封裝:Reel |
| 1N975B BK | 功能描述:DIODE ZENER 39V 500MW DO35 制造商:central semiconductor corp 系列:- 包裝:散裝 零件狀態(tài):在售 電壓 - 齊納（標稱值）（Vz）:39V 容差:±5% 功率 - 最大值:500mW 阻抗（最大值）（Zzt）:80 Ohms 不同?Vr 時的電流 - 反向漏電流:5μA @ 29.7V 不同 If 時的電壓 - 正向（Vf:1.5V @ 200mA 工作溫度:-65°C ~ 200°C（TJ） 安裝類型:通孔 封裝/外殼:DO-204AH，DO-35，軸向 供應商器件封裝:DO-35 標準包裝:2,500 |
| 1N975B TR | 功能描述:DIODE ZENER 39V 500MW DO35 制造商:central semiconductor corp 系列:- 包裝:帶卷（TR） 零件狀態(tài):在售 電壓 - 齊納（標稱值）（Vz）:39V 容差:±5% 功率 - 最大值:500mW 阻抗（最大值）（Zzt）:80 Ohms 不同?Vr 時的電流 - 反向漏電流:5μA @ 29.7V 不同 If 時的電壓 - 正向（Vf:1.5V @ 200mA 工作溫度:-65°C ~ 200°C（TJ） 安裝類型:通孔 封裝/外殼:DO-204AH，DO-35，軸向 供應商器件封裝:DO-35 標準包裝:10,000 |
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