PL
IA
N
T
Features
Applications
CO
M
■ Formerly a
product
*R
oH
S
■ Fast switching rate
■ Igniters for Xenon discharge lamps
■ Electronic igniters for gas heating and gas
■ High energy, low loss capability
■ Wide operating temperature range
■ Long service life
■ High insulation resistance
domestic appliances, e.g., cookers
■ Ignition of ultra-high pressure gas
discharge lamps for data and video
projectors
■ RoHS compliant*
Sparctube® Switching Spark Gap ST-0840 Series
Description
for voltage controlled
Bourns® Sparctube® Switching Spark Gap Series is a range of switching spark gaps designed
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 Device
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. Users should verify actual device performance in their specific
applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the
last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
Tel: +886-2 2562-4117
Email: asiacus@bourns.com
Europe:
Tel: +36 88 520 390
Email: eurocus@bourns.com
The Americas:
Tel: +1-951 781-5500
Email: americus@bourns.com
www.bourns.com
Sparctube® Switching Spark Gap ST-0840 Series
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
METAL ELECTRODE
Series
Designator
Switching Voltage
0840 = 840 V
TINNED LEADS
Tolerance
B = 12 %
1.0
(.039)
DIA.
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*
ST-0840-BCx
Product Indicator
Standard or
STD = Standard
8.0 +0.1/-0.3
(.315 +.004/-.012)
DIA.
CERAMIC INSULATOR
*Leadless version available in bulk packaging
only.
METAL ELECTRODE
Typical Part Marking
5.8 ± 0.3
(.228 ± .012)
ST 0840 wwy ...... “wwy” = Week and
year of production
ST-0840-BBx
5.8 ± 0.3
(.228 ± .012)
Recommended Pad Layout
8.6
(.339)
MAX.
9.6
(.38)
8.0 +0.1/-0.3
(.315 +.004/-.012)
DIA.
8.4
(.331)
MAX.
1.00
(.039)
DIA.
8.6
(.34)
2.52 ± 0.20
(.099 ± .008)
0.25 +0.15/-0.05
(.010 +.006/-.002)
0.20
(.008)
APPROX.
DIMENSIONS:
4.5
(.18)
8.4
(.331)
MAX.
MM
(INCHES)
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.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
Sparctube® Switching Spark Gap ST-0840 Series
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)
9.3 ± 0.1
(.366 ± .004)
SECTION A-A
REV. 11/18
“Sparctube” is a registered trademark of Bourns, Inc. in the U.S., the European Community and People’s Republic of China.
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
Legal Disclaimer Notice
This legal disclaimer applies to purchasers and users of Bourns® products manufactured by or on behalf of Bourns, Inc. and
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Unless otherwise expressly indicated in writing, Bourns® products and data sheets relating thereto are subject to change
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