1N5918B 판매점 - Zener Voltage Regulator Diodes

1N5918B 반도체 회로 부품 판매점

Zener Voltage Regulator Diodes

Motorola Semiconductors

MOTOROLA

SEMICONDUCTOR

TECHNICAL DATA

1 to 3 Watt DO-41 Surmetic 30

Zener Voltage Regulator Diodes

GENERAL DATA APPLICABLE TO ALL SERIES IN

THIS GROUP

1 to 3 Watt Surmetic 30

Silicon Zener Diodes

. . . a complete series of 1 to 3 Watt Zener Diodes with limits and operating characteristics

that reflect the superior capabilities of silicon-oxide-passivated junctions. All this in an

axial-lead, transfer-molded plastic package offering protection in all common environmen-

tal conditions.

Specification Features:

• Surge Rating of 98 Watts @ 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

POLARITY: Cathode indicated by color band. When operated in zener mode, cathode

will be positive with respect to anode

MOUNTING POSITION: Any

WEIGHT: 0.4 gram (approx)

WAFER FAB LOCATION: Phoenix, Arizona

ASSEMBLY/TEST LOCATION: Seoul, Korea

GENERAL

DATA

1–3 WATT

DO-41

SURMETIC 30

1 TO 3 WATT

ZENER REGULATOR

DIODES

3.3–400 VOLTS

CASE 59-03

DO-41

PLASTIC

MAXIMUM RATINGS

Rating

DC Power Dissipation @ TL = 75°C

Lead Length = 3/8″

Derate above 75°C

DC Power Dissipation @ TA = 50°C

Derate above 50°C

Operating and Storage Junction Temperature Range

Symbol

TJ, Tstg

Value

6.67

– 65 to +200

Unit

Watts

mW/°C

Watt

mW/°C

°C

L = LEAD LENGTH

L = 1/8″

TO HEAT SINK

L = 3/8″

2 L = 1″

0 20 40 60 80 100 120 140 160 180 200

TL, LEAD TEMPERATURE (°C)

Figure 1. Power Temperature Derating Curve

Motorola TVS/Zener Device Data

1–3 Watt DO-41 Surmetic 30 Data Sheet

6-43

GENERAL DATA — 1-3 WATT DO-41 SURMETIC 30

20 D =0.5

7 0.2

0.1

2 0.05

0.02

0.7 0.01

0.5 D = 0

0.3

0.0001 0.0002

PPK t1

DUTY CYCLE, D =t1/t2

0.0005

0.001

NOTE: BELOW 0.1 SECOND, THERMAL

RESPONSE CURVE IS APPLICABLE

TO ANY LEAD LENGTH (L).

SINGLE PULSE ∆TJL = θJL (t)PPK

REPETITIVE PULSES ∆TJL = θJL (t,D)PPK

0.002

0.005 0.01 0.02

0.05 0.1

t, TIME (SECONDS)

0.2

0.5 1

5 10

Figure 2. Typical Thermal Response L, Lead Length = 3/8 Inch

RECTANGULAR

500 NONREPETITIVE

WAVEFORM

300 TJ = 25°C PRIOR

200 TO INITIAL PULSE

100

0.1 0.2 0.3 0.5

1 2 3 5 10 20 30 50 100

PW, PULSE WIDTH (ms)

Figure 3. Maximum Surge Power

0.5

0.2

0.1

0.05

0.02

0.01

0.005

0.002

0.001

0.0005

0.0003

TA = 125°C

2 5 10 20 50 100 200 400 1000

NOMINAL VZ (VOLTS)

Figure 4. Typical Reverse Leakage

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 = 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 mea-

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

mined by:

TJ = TL + ∆TJL

1–3 Watt DO-41 Surmetic 30 Data Sheet

6-44

∆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 capa-

bility. Surge limitations are given in Figure 3. They are lower

than would be expected by considering only junction tempera-

ture, as current crowding effects cause temperatures to be ex-

tremely high in small spots resulting in device degradation

should the limits of Figure 3 be exceeded.

Motorola TVS/Zener Device Data

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1N5918B 반도체 회로 부품 판매점

Zener Voltage Regulator Diodes

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