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STMicroelectronics
STMicroelectronics

DB4 Datasheet

DIAC


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®
FEATURES
VBO : 32V / 34V / 40V VERSIONS
LOW BREAKOVER CURRENT
DB3 /DB4 / DC34
TRIGGER DIODES
DESCRIPTION
High reliability glass passivation insuring
parameter stability and protection against
junction contamination.
DO 35
(Glass)
ABSOLUTE RATINGS (limiting values)
Symbol
Parameter
P Power dissipation on printed circuit
(L = 10 mm)
Ta = 65 °C
ITRM Repetitive peak on-state curren t
tp = 20 µs
F= 100 Hz
Tstg Storage and operating junction temperature range
Tj
Value
150
2
- 40 to + 125
- 40 to + 125
Unit
mW
A
°C
°C
THERMAL RESISTANCES
Symbol
Parameter
Rth (j-a) Junction to ambient
Rth (j-l) Junction-leads
April 1995
Value
400
150
Unit
°C/W
°C/W
1/4
Page 1

DB3 / DB4 / DC34
ELECTRICAL CHARACTERISTICS (Tj = 25°C)
Symbol
Parameter
Test Conditions
Value
Unit
DB3 DC34 DB4
VBO Breakover voltage *
C = 22nF **
MIN 28 30 35
V
see diagram 1
TYP 32 34 40
MAX 36 38 45
[I+VBOI-I-VBOI] Breakover voltage
symmetry
C = 22nF **
see diagram 1
MAX
±3
V
IV± I
Dynamic breakover I = [IBO to IF=10mA] MIN
voltage *
see diagram 1
5
V
VO Output voltage *
see diagram 2
MIN
5
V
IBO Breakover current *
C = 22nF **
MAX 100 50 100 µA
tr Rise time *
see diagram 3
IB
Leakage current *
VB = 0.5 VBO max
see diagram 1
* Electrical characteristic applicable in both forward and reverse directions.
** Connected in parallel with the devices.
TYP
MAX
1.5
10
µs
µA
DIAGRAM 1 : Current-voltage characteristics
DIAGRAM 2 : Test circuit for output voltage
-V
2/4
+ IF
1 0m A
220 V
50 Hz
10 k
500 k
0.1 F
D.U.T
VO
R = 20
IBO
IB
0,5 VBO
V
+V
VBO
- IF
DIAGRAM 3 : Test circuit see diagram 2.
Adjust R for lp=0.5A
90 %
lp
10 %
tr
®
Page 2

Fig.1 : Power dissipation versus ambient tempera-
ture (maximum values)
DB3 / DB4 / DC34
Fig.2 : Relative variation of VBO versus junction
temperature (typical values)
P (mW)
160
140
120
100
80
60
40
20
Tamb
(o
o
C)
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130
VBO[Tj]
VBO[Tj=25oC]
1.08
1.06
1.04
1.02
1.00
25
50
o
Tj( C)
75
100 125
Fig.3 : Peak pulse current versus pulse duration
(maximum values)
I TRM (A)
2
1
F = 100 Hz
Tj initial = 25 o C
0.1
0.01
10
tp ( s)
100 1000
10000
3/4
®
Page 3

DB3 / DB4 / DC34
PACKAGE MECHANICAL DATA (in millimeters)
DO 35 Glass
B
note 1 E
A
B
E note 1
O/ C
O/ D
note 2
O/ D
REF.
DIMENSIONS
NOTES
Millimeters
Inches
Min. Max. Min. Max.
A 3.050 4.500 0.120 0.117 1 - The lead diameter D is not controlled over zone E
B 12.7
0.500
2 - The minimum axial lengh within which the device may be
C 1.530 2.000 0.060 0.079 placed with its leads bent at right angles is 0.59”(15 mm)
D 0.458 0.558 0.018 0.022
E 1.27 0.050
Cooling method by convection and conduction
Marking : type number
Weight : 0.15 g
Polarity : N A
Stud torque : N A
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
© 1995 SGS-THOMSON Microelectronics - All rights reserved.
Purchase of I2C Components by SGS-THOMSON Microelectronics, conveys a license under the Philips
I2C Patent. Rights to use these components in an I2C system, is granted provided that the system conforms to
the I2C Standard Specifications as defined by Philips.
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
4/4
®
Page 4
Part Number DB4
Manufactur STMicroelectronics
Description DIAC
Total Page 4 Pages
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