BOURNS ST-0840

PL
IA
N
T
Features
Applications
M
■ Formerly a
product
CO
*R
oH
S
■ Igniters for architectural and automotive
Xenon discharge lamps
■ Fast switching rate
■ High energy, low loss capability
■ Wide operating temperature range
■ Long service life
■ High insulation resistance
■ Electronic igniters for gas heating and gas
domestic appliances, e.g., cookers
■ Ignition of ultra-high pressure gas
discharge lamps for data and video
projectors
■ RoHS compliant*
ST-0840 Series Sparctube™ Switching Spark Gap
Description
Bourns® Sparctube™ Series is a range of switching spark gaps designed specifically for voltage controlled switching of capacitive
discharge circuits where a high energy, low loss, fast rate of switching is required. This series is ideally suited for applications where a
capacitive discharge is utilized with a transformer to obtain pulses of very high voltage levels in the order of several thousand volts.
Characteristics
Initial Values:
Static Breakdown Voltage @ 800 V/s 1
First Ignition Values ..............................................................................................................< 950 V
Following Ignition Values ......................................................................................................740 V to 940 V
Electrical Life:
Minimum Number of Switching Cycles .......................................................................................2x105
Peak Current ..............................................................................................................................Approx. 450 A
Maximum Switching Frequency..................................................................................................500 Hz
Breakdown Characteristics @ 1000 V Limit
First Ignition Values ..............................................................................................................≤ 1000 V
Delay Time............................................................................................................................< 60 ms
Following Ignition Values ......................................................................................................720 V to 960 V
General Data:
Breakdown Time .........................................................................................................................< 50 ns
Insulation Resistance @100 Vdc ...............................................................................................> 100 megohms
Maximum Static Breakdown Voltage @ 100 V/ms .....................................................................1300 V
Share of Early Ignition Values (< 720 V) ....................................................................................< 1 %
Residual Voltage @ 50 ns ..........................................................................................................< 300 V
Capacitance................................................................................................................................< 1 pF
Operating Temperature Range 2 ................................................................................................-40 °C to +170 °C
Storage Temperature Range ......................................................................................................-65 °C to +125 °C
Weight ........................................................................................................................................Approx. 2.3 g
Testing ........................................................................................................................................100 %
Robustness of Terminations .......................................................................................................IEC 60068-2-21 3
Notes:
1 At delivery AQL 0.65 Level II, DIN ISO 2859.
2 Distribution of switchings: maximum 20 % above +125 °C and 20 % below +20°C.
3 Test Ua1 (tensile), Ua2 (thrust), Ub (bending) and Uc (torsion).
Basic Application Circuit
Sparctube™
Switching Spark Gap
R
C
LOAD
*RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
Asia-Pacific:
Tel: +886-2 2562-4117
Fax: +886-2 2562-4116
Europe:
Tel: +41-41 768 5555
Fax: +41-41 768 5510
The Americas:
Tel: +1-951 781-5500
Fax: +1-951 781-5700
www.bourns.com
ST-0840 Series Sparctube™ Switching Spark Gap
Product Dimensions
How to Order
ST - 0840 - B x x - STD
ST-0840-BLx
8.0 +0.1/-0.3
(.315 +.004/-.012)
DIA.
CERAMIC INSULATOR
Series
Designator
Switching Voltage
0840 = 840 V
METAL ELECTRODE
TINNED LEADS
1.0
(.039)
DIA.
Tolerance
B = 12 %
Lead Shape
B = Bent Leads
C = No Leads*
L = Straight Leads
5.8 ± 0.3
(.228 ± .012)
60.0 - 82.0
(2.362 - 3.228)
Packaging
B = Bulk
T = Tape & Reel*
Standard or Modified Product Indicator
STD = Standard
ST-0840-BCx
8.0 +0.1/-0.3
(.315 +.004/-.012)
DIA.
CERAMIC INSULATOR
*Leadless version available in bulk packaging
only.
METAL ELECTRODE
Typical Part Marking
ST 0840 wwy ...... “wwy” = Week and
year of production
5.8 ± 0.3
(.228 ± .012)
ST-0840-BBx
5.8 ± 0.3
(.228 ± .012)
8.6
(.339)
MAX.
8.0 +0.1/-0.3
(.315 +.004/-.012)
DIA.
8.4
(.331)
MAX.
1.00
(.039)
DIA.
0.25 +0.15/-0.05
(.010 +.006/-.002)
0.20
(.008)
APPROX.
DIMENSIONS:
2.52 ± 0.20
(.099 ± .008)
MM
(INCHES)
8.4
(.331)
MAX.
Test Circuit
R
Uo
L
C
DUT
Us
Uo .........1000-1500 V
R ...........See Note
C ...........100 nF
L............0.5 µH
DUT ......Device Under Test
Us .........Breakdown Voltages
NOTE: Uo and R are set to provide suitable conditions for
different measurements.
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
ST-0840 Series Sparctube™ Switching Spark Gap
Packaging Specifications
Models ST-0840-BBB, ST-0840-BLB and ST-0840-BCB* ship standard bulk pack, 1,000 pcs./bag. The optional tape and reel packaging
contains 1,000 pcs./reel for Model ST-0840-BLT; 500 pcs./reel for Model ST-0840-BBT.
* Available in bulk packaging only.
ST-0840-BLT
ST-0840-BBT
2.2 ± 0.5
(.087 ± .020)
16.5 ± 0.1
(.650 ± .004)
20.2 ± 1.0
(.795 ± .039)
14.0 +1.0/-0.0
(.551 +.039/-.00)
DIA.
100 ± 1.0
(3.937 ± .039)
90.0 ± 2.0
(3.543 ± .079)
13.0 ± 0.2
(.512 ± .008)
90.0 ± 2.0
(3.543 ± .079)
356.0 ± 2.0
(14.016 ± .079)
DIA.
330
(12.992)
105.0
(4.134)
4.0 ± 0.1
(.157 ± .004)
2.0 ± 0.1
(.079 ± .004)
12.0 ± 0.1
(.472 ± .004)
12.0 ± 0.1
(.472 ± .004)
1.75
(.069)
C B
10.0 ± 1.0
(.394 ± .039)
SPACING
7.50
(.295)
6.2 ± 1.0
(.244 ± .039)
A
85.0 ± 2.0
(3.346 ± .079)
A
C B
9.1 +0.2/-0.0
(.358 +.008/-.000)
DIMENSIONS:
16.0
(.630)
8.2 +0.2/-0.0
(.323 +.008/-.000)
0.50 ± 0.05
(.020 ± .002)
MM
(INCHES)
SECTION C-C
SECTION B-B
8.5 +0.15/-0.05
(.335 +.006/-.002)
REV. 10/12
“Sparctube” is a registered trademark of Bourns, Inc. in the European Community, with pending trademark registration applications in the U.S. and China.
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
9.3 ± 0.1
(.366 ± .004)
SECTION A-A