General Semiconductor 1N978B, 1N977B, 1N976B, 1N974B, 1N975B Datasheet

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SYMBOL MIN. TYP. MAX. UNIT

Thermal Resistance

thJA

– – 300

(1)

°C/W

Junction to Ambient Air Forward Voltage

– – 1.5 Volts

at IF= 200 mA

NOTES:

(1) Valid provided that leads at a distance of 3/8” from case are kept at ambient temperature.

FEATURES

♦ Silicon Planar Power Zener Diodes ♦ Standard Zener voltage tolerance is ±5% for

“B” suffix. Other tolerances are available upon request.

MECHANICAL DATA

Case: DO-35 Glass Case Weight: approx. 0.13 g

MAXIMUM RATINGS

Ratings at 25°C ambient temperature unless otherwise specified.

1N957 THRU 1N978

ZENER DIODES

min. 1.083 (27.5)

max. .150 (3.8)

max.

∅

Cathode

.020 (0.52)

Mark

max.

∅

.079 (2.0)

DO-35

Dimensions are in inches and (millimeters)

1/6/98

SYMBOL VALUE UNIT

Zener Current (see Table “Characteristics”) Power Dissipation at TL= 75°C P

tot

500

(1)

Junction Temperature T

175 °C

Storage Temperature Range T

– 65 to +175 °C

NOTES:

(1) TLis measured 3/8” from body.

NEW PRODUCT NEW PRODUCT NEW PRODUCT

1N957 THRU 1N978

ELECTRICAL CHARACTERISTICS

Ratings at 25°C ambient temperature unless otherwise specified.

Type Number

Nominal

Zener Voltage

(3)

(Volts)

Test

Current

(mA)

Maximum Zener Impedance

(1)

Maximum

Regulator Current

(2)

(mA)

Maximum Reverse Current

IRMaximum

(µA)

Test Voltage Vdc

(Volts)

ZT @IZT

(Ω)

ZK @IZK

(Ω)

(mA)

1N957B 6.8 18.5 4.5 700 1 47 150 5.2 1N958B 7.5 16.5 5.5 700 0.5 42 75 5.7 1N959B 8.2 15 6.5 700 0.5 38 50 6.2 1N960B 9.1 14 7.5 700 0.5 35 25 6.9 1N961B 10 12.5 8.5 700 0.25 32 10 7.6 1N962B 11 11.5 9.5 700 0.25 28 5 8.4 1N963B 12 10.5 11.5 700 0.25 26 5 9.1 1N964B 13 9.5 13 700 0.25 24 5 9.9 1N965B 15 8.5 16 700 0.25 21 5 11.4 1N966B 16 7.8 17 700 0.25 19 5 12.2 1N967B 18 7 21 750 0.25 17 5 13.7 1N968B 20 6.2 25 750 0.25 15 5 15.2 1N969B 22 5.6 29 750 0.25 14 5 16.7 1N970B 24 5.2 33 750 0.25 13 5 18.2 1N971B 27 4.6 41 750 0.25 11 5 20.6 1N972B 30 4.2 49 1000 0.25 10 5 22.8 1N973B 33 3.8 58 1000 0.25 9.2 5 25.1 1N974B 36 3.4 70 1000 0.25 8.5 5 27.4 1N975B 39 3.2 80 1000 0.25 7.8 5 29.7 1N976B 43 3 93 1500 0.25 7 5 32.7 1N977B 47 2.7 105 1500 0.25 6.4 5 35.8 1N978B 51 2.5 125 1500 0.25 5.9 5 38.8

NOTES:

(1) The Zener Impedance is derived from the 1 KHZAC voltage which results when an AC current having an RMS value equal to 10% of the Zener current (IZT) is

superimposed on I

. Zener Impedance is measured at two points to insure a sharp knee on the breakdown curve and to eliminate unstable units. (2) Valid provided that leads at a distance of 3/8” from case are kept at ambient temperature. (3) Measured with device junction in thermal equilibrium.