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®
FEATURES
s VBO : 32V
s Low breakover current: 15µA max
s Breakover voltage range: 30 to 34V
DESCRIPTION
Functioning as a trigger diode with a fixed voltage
reference, the DB3TG can be used in conjunction
with triacs for simplified gate control circuits or as
a starting element in fluorescent lamp ballasts.
DB3TG
DIAC
DO-35
ABSOLUTE MAXIMUM RATINGS (limiting values)
Symbol
Parameter
ITRM Repetitive peak on-state current
tp = 20 µs F= 120 Hz
Tstg Storage temperature range
Tj Operating junction temperature range
Value
2
Unit
A
- 40 to + 125 °C
October 2001 - Ed: 2A
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DB3TG
ELECTRICAL CHARACTERISTICS (Tj = 25°C unless otherwise specified)
Symbol
Parameter
Test Conditions
VBO Breakover voltage *
I VBO1 - VBO2 I Breakover voltage
symmetry
V Dynamic breakover
voltage *
VO Output voltage *
IBO Breakover current *
tr Rise time *
IR Leakage current *
* Applicable to both forward and reverse directions.
** Connected in parallel to the device.
C = 22nF **
C = 22nF **
VBO and VF at
10mA
see diagram 2
(R=20)
C = 22nF **
see diagram 3
VR = 0.5 VBO max
MIN.
TYP.
MAX.
MAX.
MIN.
MIN.
MAX.
MAX.
MAX.
Value
30
32
34
±2
9
5
15
2
10
Unit
V
V
V
V
µA
µs
µA
ORDERING INFORMATION
DB 3 TG
Diac Series
Breakover voltage
3: VBO typ = 32V
Special VBO range
OTHER INFORMATION
Part Number
Marking
DB3TG
DB3TG (Blue Body Coat)
Weight
0.15 g
Base Quantity
5000
Packing Mode
Tape & Reel
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Diagram 1: Voltage - current characteristic curve. Diagram 2: Test circuit.
10 k500 kD.U.T Rs=0
DB3TG
+ IF
10mA
220 V
50 Hz
C=0.1µF
Vo
I
P
T410
R=20
IB O
- V IR
+ V Diagram 3: Rise time measurement.
0,5 VBO
V
lp
VF VBO
90 %
- IF
10 %
tr
Fig. 1: Relative variation of VBO versus junction
temperature (typical values)
VBO [Tj]
VBO [Tj = 25°C]
1.08
1.06
1.04
1.02
1.00
25
Tj (°C)
50 75
100
125
Fig. 2: Repetitive peak pulse current versus pulse
duration (maximum values).
ITRM(A)
20.0
10.0
F=120Hz
Tj initial=25°C
1.0
0.1
1
tp(µs)
10
100
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Fig. 3: Time duration while current pulse is higher
50mA versus C and Rs (typical values).
tp(µs)
40
Tj=25°C
35
30
25
20
15
10
5
0
10 20
68
47
33
22
10
0C(nF)
50 100 200
500
DB3TG
PACKAGE MECHANICAL DATA (in millimeters)
DO-35
CA
C O/ B
O/ D O/ D
REF.
A
B
C
D
DIMENSIONS
Millimeters
Inches
Min.
3.05
Max.
4.50
Min.
0.120
Max.
0.177
1.53 2.00 0.060 0.079
28.00
1.102
0.458 0.558 0.018 0.022
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility 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 STMicroelectronics. Specifications mentioned in this publication are subject to
change without notice. This publication supersedes and replaces all information previously supplied.
STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written ap-
proval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
© 2001 STMicroelectronics - Printed in Italy - All rights reserved.
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