Gas Discharge Tube (GDT) Products
SL1021A/B, SL1024A/B and PMT8 Series
SL1021A/B, SL1024A/B and PMT8 Series
Description
®
GDT circuit protection devices dissipate electrical
surge energy safely within a contained plasma gas.
Commonly used to help protect sensitive telecom and
networking equipment and lines, GDTs protect from
damage that may result from lightning strikes and
equipment switching operations.
The Littelfuse GDT series described in this document
are available in a variety of leaded and surface mount
forms and offered with and without optional fail-
safe clip. Please refer to the electrical specifications,
dimension and packaging options section of this
document for additional information.
Agency Approvals
AGENCY
®
AGENCY FILE NUMBER
E128662
SL1021A/B and SL1024A/B Series:
SL1021A/B and SL1024A/B series GDTs are designed
to offer high levels of performance on fast rising
transients in the range of 100V/μS to 1KV/μS, which
are those most likely created by induced lightning
disturbances.
These devices feature ultra low capacitance (typically
1.5pF or less) and are extremely robust with SL102xA
devices able to divert a 10,000 Amp pulse without
destruction, and SL102xB suffix devices able to divert
a 20,000 Amp pulse without destruction.
These series offer optimized internal geometry which
provide low insertion loss at high frequencies, ideal
for the protection of broadband and other high speed
transmission equipment.
PMT8 Series:
PMT8 GDT's are telecom grade devices designed to
meet the recommendations in CCITT-K12 and Bellcore
GR-1361-CORE. The three electrode configuration
is used in applications where simultaneous crowbar
action of two signal lines is required.
Product Characteristics
Materials
Dull Tin Plate 17 ± 12.5 Microns.
.5
with ceramic insulator
‘LF’ mark, voltage& date code:
SL102xA
- Red/White
text
SL102xB
& PMT8 - Blue/White
text
~ 1Amp
~60-200 Volts
-40 to +90°C
< 0.2μSec
(Tested to ITU-T Rec. K.12)
~10 to 35 Volts
<150mS
(Tested to ITU-T Rec. K.12)
SL1021A/B, SL1024A/B and PMT8 Series
3 Electrode GDT Graphical Symbol
a
b
a = TIP
b = RING
e = GROUND
(center electrode)
e
Features
• RoHS compliant
• Low insertion loss
• Excellent response to
fast rising transients
• Ultra low capacitance
• 10KA (A suffix devices) /
20KA (B suffix devices)
surge capability tested
with 8/20μs pulse as
defined by IEC 61000-4-5
• Available with thermal
failsafe option (add ‘F’
suffix to part number)
Applications
SL1021 / SL1024:
• Broadband equipment
• ADSL equipment
• XDSL equipment
• Satellite and CATV
equipment
• Splitters
• General telecom
equipment
PMT8:
• Telecom network
interfaces
• Telephone line cards
• Repeaters
• Modems
• Line test equipment
Product Marking
Glow to arc
transition current
Glow Voltage
Storage and Operation
Temperature
Transverse Voltage
(Delay Time)
Arc Voltage
Holdover Voltage
©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com for current information.
Customer should verify actual device performance in their specific applications.
19
Revised: November 10, 2009
Gas Discharge Tube (GDT) Products
SL1021A/B, SL1024A/B and PMT8 Series
Electrical Characteristics
Device Specifications
(at 25°C)
Part
Number*
SL1021A090
SL1024A090
SL1021B090
SL1024B090
PMT 8 090
SL1021A145
SL1024A145
SL1021B145
SL1024B145
SL1021A150
SL1024A150
SL1021B150
SL1024B150
SL1021A200
SL1021A230
SL1024A230
SL1021B230
SL1024B230
PMT 8 230
SL1021A250
SL1024A250
SL1021B250
SL1024B250
PMT 8 250
SL1021A260
SL1024A260
SL1021B260
SL1024B260
SL1021A300
SL1024A300
SL1021B300
SL1024B300
SL1021A350
SL1024A350
SL1021B350
SL1024B350
PMT 8 350
SL1021A400
SL1024A400
SL1021B400
SL1024B400
PMT 8 400
SL1021A420
SL1024A420
SL1021B420
SL1024B420
SL1021A450
SL1024A450
SL1021B450
SL1024B450
SL1021A500
SL1024A500
SL1021B500
SL1024B500
SL1021A600
SL1024A600
Life Ratings
Capaci-
tance
(@1Mhz)
DC Voltage
100V/Sec.
MIN
TYP
MAX
DC
Voltage
100 V/
μSec.
DC
Voltage
1kV/
μSec.
Insulation
Resistance
MIN
AC
Current
50Hz
1Sec.x10
1
Surge
Current
8/20μSec
x10
1
Max
Single
Surge
8/20μSec
1
Max Single
Surge
10/350μSec
1
Surge Life
10/1000
μSecx300
1
72
90
108
650
!
4kA
2
5kA
3
116
145
174
500
600
120
150
150
200
180
250
184
230
276
450
650
200
250
300
500
210
260
310
550
700
<1.5pF
10Amps
!
10kA
2
20kA
3
15kA
2
25kA
3
2.5kA
2
5kA
3
200Amps
240
300
360
650
850
280
350
420
700
900
320
400
480
850
950
345
420
500
360
450
540
900
1000
400
500
600
950
1100
480
600
720
1000
1200
NOTES:
*Max capacitance is 1.5 pF measured at 1 MHz.
,
1. Total current through centre electrode, tested in accordance with ITU-T Rec K.12
2. SL A series
3. SL B series & PMT 8 series
SL1021A/B, SL1024A/B and PMT8 Series
20
Revised: November 10, 2009
©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com for current information.
Customer should verify actual device performance in their specific applications.
Gas Discharge Tube (GDT) Products
SL1021A/B, SL1024A/B and PMT8 Series
Time vs. Current for Failsafe
60
30
20
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
SL102xA with Failsafe
SL102xB or PMT8 500 Volt Higher Melting Point Solder
SL102xB or PMT8 350 Volt Higher Melting Point Solder
SL102xB or PMT8 90 Volt Higher Melting Point Solder
Voltage vs. Time Characteristic
Max dynamic breakover
voltage
Voltage
(V)
Hold-over voltage
On-State voltage
0.5 1
2
5
10
15
30
0
200
400
600
Time (ns)
800
1000
1200
Soldering Parameters - Reflow Soldering (Surface Mount Devices)
Reflow Condition
- Temperature Min (T
s(min)
)
Pre Heat
- Temperature Max (T
s(max)
)
- Time (Min to Max) (t
s
)
Average ramp up rate (Liquidus Temp
(T
L
) to peak
T
S(max)
to T
L
- Ramp-up Rate
Reflow
- Temperature (T
L
) (Liquidus)
- Temperature (t
L
)
Pb – Free assembly
150°C
T
P
Ramp-up
t
P
Critical Zone
T
L
to T
P
60 – 180 secs
3°C/second max
5°C/second max
217°C
60 – 150 seconds
260
+0/-5
Temperature
200°C
T
L
T
S(max)
Preheat
t
L
Ramp-down
T
S(min)
t
S
25
time to peak temperature
(t 25ºC to peak)
Time
Peak Temperature (T
P
)
Time within 5°C of actual peak
Temperature (t
p
)
Ramp-down Rate
Time 25°C to peak Temperature (T
P
)
Do not exceed
°C
10 – 30 seconds
6°C/second max
8 minutes Max.
260°C
Soldering Parameters - Hand Soldering
Solder Iron Temperature: 350° C +/- 5°C
Heating Time: 5 seconds max.
Soldering Parameters - Wave Soldering (Thru-Hole Devices)
300
Recommended Process Parameters:
Wave Parameter
Preheat:
(Depends on Flux Activation Temperature)
(Typical Industry Recommendation)
Temperature
(°C) - Measured on bottom side of board
280
260
240
220
200
180
160
140
120
100
80
60
40
20
100
110
120
130
150
160
170
180
190
200
210
220
230
140
240
10
20
30
40
50
60
70
80
90
0
0
Lead-Free Recommendation
Temperature Minimum:
Temperature Maximum:
Preheat Time:
Solder Pot Temperature:
Solder Dwell Time:
100
°
C
150
°
C
60-180 seconds
280
°
C Maximum
2-5 seconds
Time
(Seconds)
Preheat
Time
Dwell
Time
Cooling
Time
Note: Surge Arrestors with a Failsafe mechanism should be
individually examined after soldering
©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com for current information.
Customer should verify actual device performance in their specific applications.
21
Revised: November 10, 2009
SL1021A/B, SL1024A/B and PMT8 Series
Gas Discharge Tube (GDT) Products
SL1021A/B, SL1024A/B and PMT8 Series
Device Dimensions
NOTE: Failsafe option dimensions shown in
green.
Shaped Radial Leaded Devices:
12.4 ± 1
[0.488 ± 0.039]
Surface Mount Devices:
Mounting Area
9.0
[0.354]
8.1.
[0.319]
Type 04 / R
11.8
[0.464]
10.10
[0.398]
Type 01 / C
0.3mm
Minimum
Gap
11.8
[0.464]
10.10
[0.398]
Mounting Area
9.0
[0.354]
8.1
[0.319]
0.3mm
Minimum
Gap
9.9
[0.354]
9.9
[0.354]
15
[0.590]
16.8
[0.661]
1.0 DIA. MAX.
[0.039]
4.4
[0.173]
Type 60
4.4± 0.3
[0.173± 0.12]
10.0 ± 0.3
[0.394 ± 0.019]
7.7 ± 0.3
[0.303 ± 0.019]
Ø7.0 ± 0.1
[0.275 ± 0.004]
4.4± 0.3
[0.173± 0.12]
12.4 ± 1
[0.488 ± 0.039]
Type 05 / P
11.8
[0.464]
10.10
[0.398]
Mounting Area
9.0
[0.354]
8.1.
[0.319]
8.3 +0.3/-0.0
[0.327
+0.019/-0.00]
8.0 +0.3/-0.1
[0.315
+0.019/-0.004]
PROFILE VIEW
SIDE VIEW
TOP VIEW
0.3mm
Minimum
Gap
9.9
[0.354]
1.2 ± 0.0
[0.047 ± 0.000]
2.2 ± 0.0
[0.087 ± 0.000]
1.2 ± 0.0
[0.047 ± 0.000]
15
[0.590]
16.8
[0.661]
1.0 DIA. MAX.
[0.039]
6.0 ± 0.0
[0.236 ± 0.000]
8.5 ± 0.0
[0.335 ± 0.000]
4.4
[0.173]
10.75 ± 0.0
[0.423 ± 0.000]
5.5± 0.3
[0.216± 0.12]
SOLDERING PAD LAYOUT
Overall Product Space
DO NOT ENCROACH
5.5± 0.3
[0.216± 0.12]
Straight "T" Leaded Devices:
Type 14 / X
50 ± 3
[1.968 ± 0.118 ]
11.8
[0.464]
10.10
[0.398]
0.3mm
Minimum
Gap
Mounting Area
9.0
[0.354]
8.1 DIA. MAX.
[0.319]
Straight Radial Leaded Devices:
14.7
[0.579]
Type 06 / Y
11.8
[0.464]
10.10
[0.398]
Mounting Area
9.0
[0.354]
8.1 DIA. MAX.
[0.319]
0.3mm
Minimum
Gap
9.9
[0.354]
15
[0.590]
23.8
[0.937]
22
[0.866]
1.0 DIA. MAX.
[0.039]
6.35 ± 0.5
[0.25 ± 0.25]
6.35 ± 0.5
[0.25 ± 0.25]
16.8
[0.661]
1.0 DIA. MAX.
[0.039]
SL1021A/B, SL1024A/B and PMT8 Series
22
Revised: November 10, 2009
©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com for current information.
Customer should verify actual device performance in their specific applications.
Gas Discharge Tube (GDT) Products
SL1021A/B, SL1024A/B and PMT8 Series
Part Numbering System and Ordering Information
Packaging
Device Type
Type 01 / C
Type 04 / R
Type 05 / P
Description
100pcs/tray x 5 trays per carton
100pcs/tray x 5 trays per carton
100pcs/tray x 5 trays per carton
100pcs/tray x 5 trays per carton
50pcs/tray x 5 trays per carton
500pcs/reel* x 10 reels per carton
Quantity
500
500
500
500
250
5000
SL102x x xxx x x
Series
SL1021
SL1024
PMT8 xxx x x
Series
PMT8
Surge Capability
A = 10kA
B = 20kA
Breakdown Voltage
090 = 90V
145 = 145V
150 = 150V
200 = 200V
230 = 230V
250 = 250V
260 = 260V
300 = 300V
350 = 350V
400 = 400V
420 = 420V
450 = 450V
500
=
500V
600 = 600V
Breakdown Voltage
090 = 90V
230 = 230V
250 = 250V
350 = 350V
400 = 400V
Type 06 / Y
Type 14 / X
Type 60
* For tape and reel specifications, please contact factory.
Configuration Code
(See Device Dimensions section)
C
Y
R
S
P
X
Configuration Code
(See Device Dimensions section)
01
10
04
14
05
60
06
Option Code
Blank = No failsafe
F or G = With Failsafe
Option Code
Blank = No Failsafe
F = With Failsafe
©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com for current information.
Customer should verify actual device performance in their specific applications.
23
Revised: November 10, 2009
SL1021A/B, SL1024A/B and PMT8 Series
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