Datasheet > BZX55C6V8RA2

BZX55C6V8RA2

更新时间： 2022-12-01 21:05:06

品牌	Logo	应用领域
TAK_CHEONG		/
页数	文件大小	规格书
9页	569K
描述
Zener Diode, 6.8V V(Z), 5.88%, 0.5W, Silicon, Unidirectional, DO-35, HERMETIC SEALED, GLASS, DO-204AH, 2 PIN

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BZX55C6V8RA2 数据手册

BZX55C2V4 through BZX55C91 Series

APPLICATION NOTE - ZENER VOLTAGE

500

400

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:

300

200

100

Lead Temperature, T_L, should be determined from:

2.4-60 V

T_L= θ_LAP_D+ T_A.

θ_LAis the lead-to-ambient thermal resistance (°C/W) and P_D

is the power dissipation. The value for θ_LAwill vary and

depends on the device mounting method. θ_LAis generally 30

to 40°C/W for the various clips and tie points in common use

and for printed circuit board wiring.

62-200 V

0.2

0.4

0.6

0.8

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 T_L, the junction temperature

may be determined by:

L , LEAD LENGTH TO HEAT SINK (INCH)

Figure 2. Typical Thermal Resistance

1000

7000

5000

TYPICAL LEAKAGE CURRENT

AT 80% OF NOMINAL

2000

1000

BREAKDOWN VOLTAGE

T_J= T_L+ ∆T_JL

700

500

∆T_JLis the increase in junction temperature above the lead

temperature and may be found from Figure 2 for dc power:

200

100

∆T_JL= θ_JLP_D.

For worst-case design, using expected limits of I_Z, limits

of P_Dand the extremes of T_J(∆T_J) may be estimated.

Changes in voltage, V_Z, can then be found from:

∆V = θ_VZT_J.

θ_VZ, the zener voltage temperature coefficient, is found

from Figures 4 and 5.

0.7

0.5

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.

+125°C

0.2

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 extremely high in small spots, resulting in device

degradation should the limits of Figure 7 be exceeded.

0.1

0.07

0.05

0.02

0.01

0.007

0.005

+25°C

0.002

0.001

, NOMINAL ZENER VOLTAGE (VOLTS)

Figure 3. Typical Leakage Current

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