Gas Discharge Tube (GDT) Products
CG/CG2 Series
CG/CG2 Series
Description
Littelfuse highly reliable CG/CG2 Series GDTs provide
a high degree of surge protection in a small size ideal
for board level circuit protection.
GDTs function as switches which dissipate a
minimum amount of energy and therefore handle
currents that far surpass other types of transient
voltage protection. Their gas-filled, rugged ceramic
metal construction make them well suited to adverse
environments.
The CG/CG2 series comes in a variety of forms
including surface mount, core, straight and shaped
leads, to serve a variety of mounting methods.
AGENCY FILE NUMBER
Agency Approvals
AGENCY
E128662
E320116
2 Electrode GDT Graphical Symbol
The CG Series (75-110V) is ideal for protection of test
and communication equipment and other devices
in which low voltage limits and extremely low arc
voltages are required.
The CG2 Series (145V-1000V) is ideal for protecting
equipment where higher voltage limits and holdover
voltages are necessary.
Features
• Rugged Ceramic-Metal
construction
• Low Capacitance
(<1.5pf)
Applications
• Meets REA PE-80
• Available in surface
mount, and a variety of
lead options options
• Communication lines
and equipment
• CATV equipment
• Test equipment
• Data lines
• Power supplies
•
•
•
•
Instrumentation circuits
Medical electronics
ADSL equipment
Telecom SLIC
protection
©2013 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.
CG/CG2 Series
Revised: January 10, 2013
Gas Discharge Tube (GDT) Products
CG/CG2 Series
Electrical Characteristics
Device Specifications
(at 25°C)
DC Breakdown
in Volts
(@100V/s)
Life Ratings
Surge
Life
(@500A
10/1000µs)
Impulse
Break-
down
in Volts
(@100V/µs)
Impulse
Break-
down In
Volts
(@1 Kv/µsec)
Insulation
Capaci-
Arc
Resistance
tance Voltage
(@1MHz)
(on state
Voltage)
@1Amp
Min
Nominal Nominal
AC
DC
Max
Impulse
AC
Dischage Holdover Impulse
Discharge Discharge Current Voltage
2
Discharge
(9 cycle
Current
Current
Current
(8/20µs)
(10x1sec
@50-60Hz)
@50Hz)
(1 Application
@ 10/350µs)
Part
Number
CG75
CG90
CG90 SN
CG110
CG2145
CG2230
CG2250
CG2300
CG2350
CG2420
CG2470
CG2600
CG2800
1
MIN
TYP MAX
MAX
MIN
MAX
TYP
TYP
60
72
72
88
75
90
90
110
90
108
108
132
174
174
265
276
288
300
345
360
403
420
483
540
564
690
720
920
400
400
400
450
500
500
600
600
625
625
700
700
750
750
800
850
850
1000
1000
1200
1500
650
600
600
600
600
600
700
700
725
725
800
800
900
900
1000
1200
1200
1400
1400
1500
1600
10 shots
(@10kA)
10 A
65 A
10
10
Ω
(at 100V)
135 V
1.5 pf
15 V
400
shots
10 shots
(@20kA)
3
20 A
100 A
2.5kA
80 V
10
10
Ω
(at 50V)
52 V
4kA
116 145
195 230
213 250
255 300
297 350
357 420
400 470
510 600
680 800
CG2145 SN 120 145
CG2230 SN 184 230
CG2250 SN 200 250
CG2300 SN 240 300
CG2350 SN 280 350
CG2470 SN 376 470
CG2600 SN 480 600
CG21000
1
850 1000 1150
NOTES:
1. Tested to UL1449 Third Edition
2. Reference REA PE-80, 0.2A. Tested to ITU-T Rec K.12 and REA PE 80 < 150 mSec.
Product Characteristics
LS, Axial:
Device: Tin Plated 2–5 Microns
Lead Wires: Tin Plated 17 ± 12.5 Microns
.5
Construction: Ceramic Insulator
Core:
Device: Tin Plated 17 ± 12.5 Microns.
.5
Construction: Ceramic Insulator
MS:
Device: Dull Tin Plated 7–9 Microns
Construction: Ceramic Insulator
LF Logo, Voltage and date code; Black in
positive print
Glow to arc
transition current
Glow Voltage
Storage and
Operational
Temperature
Maximum Follow
On Current
1
< 0.5Amps
60-160 Volts
-40 to +90
230 Volts r.m.s, 200 Amps.
(800V and 1000V devices tested to UL1449 3rd edition)
Materials
Product Marking
CG/CG2 Series
Revised: January 10, 2013
©2013 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.
ace Mount (MS)
Gas Discharge Tube
Dimensions
TOP VIEW
8.30 ± 0.1
(GDT) Products
SOLDER PAD LAYOUT
PROFILE VIEW
CG/CG2 Series
5.58
[0.232]
6.05 ± 0.2
[0.268 ± 0.0080]
SEMI–PROFILE VIEW
4 ± 0.2
[0.161 ± 0.0080]
2.29
[0.090]
ø8.30±0.1
8.71
[0.343]
Device Dimensions
5.89
[0.232]
Ø6.81
[0.268]
0.47 ± 0.1
Leaded 'L' Type Straight Axial Devices
PROFILE VIEW
0.81
DIA. TYP.
[0.032]
8.10
DIA. MAX.
[0.319]
Leaded 'LS' Type Shaped Lead Devices
PROFILE VIEW
6.07 ± 0.3
[0.239 ± 0.012]
TOP VIEW
TOP VIEW
[0.319 DIA Max.]
8.10 Max.
8.40 ± 0.3
[0.331 ± 0.012]
6.07 ± 0.15
[0.239 ± 0.006]
62 ± 2
0.004
2 Surfaces
PROFILE VIEW
6.07
±
0.30
[0.239 ± 0.012]
TOP VIEW
[0.319 DIA Max.]
SOLDER PAD LAYOUT
9.85 ± 0.30
[0.388 ± 0.012]
11.15 ± 0.30
[0.439 ± 0.012]
0.40 ± 0.03
[0.0157 ± 0.0012]
8.4 ± 0.3
[0.331 ± 0.012]
0.80
[0.032]
8.10 Max.
Core Devices
8.40 ± 0.3
[0.331 ± 0.012]
TOP VIEW
8.10 Max.
[0.032 Max.]
0.004
9.85
[0.388]
SOLDER PAD LAYOUT
8.66
[0.341]
PROFILE VIEW
SEMI–PROFILE VIEW
9.85
[0.388]
8.60
[0.339]
2 Surfaces
0.40 ± 0.03
[0.0157 ± 0.0012]
8.10 Max.
[0.239
0.81
± 0.0059]
[0.032]
8.4 ± 0.3
5.89
[0.331 ± 0.012]
[0.232]
6.07 ± 0.15
1.77
[0.070]
11.68
[0.460]
11.65
[0.459]
1.80
[0.071]
9.85 ± 0.30
[0.388 ± 0.012]
11.15 ± 0.30
[0.439 ± 0.012]
DIMENSIONS
mm
[inches]
0.47 ± 0.1
[0.019 ± 0.0039]
'MS' Type Devices
TOP VIEW
Littelfuse
Trademark
250G
XXXX
16
4.00
Shaped Lead
1.75
Voltage Rating
8.30 ± 0.1
Current Rating
[0.327 ± 0.0039]
Date Code
4 ± 0.2
(Contact Littelfuse
[0.157 ± 0.0079]
for additional
R5.29
information)
[R0.208]
ø8.30±0.1
PROFILE VIEW
SEMI–PROFILE VIEW
5.58
[0.220]
6.05 ± 0.2
[0.238 ± 0.0079]
2
9]
0.
7
±
.00
30
0
9.
6 ±
6
.3
[0
11.50
24.00
250G
XXXX
16
250G
XXXX
16
250G
XXXX
16
250G
XXXX
16
250G
XXXX
16
0.47 ± 0.1
[0.019 ± 0.0039]
SOLDER PAD LAYOUT
2.29
[0.090]
16.00
0.512 (13.0) Arbor
Hole Dia.
12.99
(330.0)
8.71
[0.343]
5.89
[0.232]
1.01
(25.7)
Direction of F
eed
©2013 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.
CG/CG2 Series
Revised: January 10, 2013
Gas Discharge Tube (GDT) Products
CG/CG2 Series
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
Temperature
200°C
60 – 180 secs
3°C/second max
5°C/second max
217°C
60 – 150 seconds
260
+0/-5
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 - 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
140
150
160
170
180
190
200
210
220
230
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
Soldering Parameters - Hand Soldering
Solder Iron Temperature: 350° C +/- 5°C
Heating Time: 5 seconds max.
CG/CG2 Series
Revised: January 10, 2013
©2013 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.
<0.8 Max
Gas Discharge Tube (GDT) Products
CG/CG2 Series
52.4
[2.063]
22.8
[0.898]
6.4
[0.252]
5.0 Pitch
[0.197]
Packaging Dimensions
For 'L' Type Axial Lead Items
<1.2 Max. Lead Bend
254.0 - 356.0
[10.0
- 14.0]
<0.8 Max
52.4
[2.063]
22.8
[0.898]
80.0
[3.15]
Direction of Feed
6.4
[0.252]
5.0 Pitch
[0.197]
Core and 'MS' Type Items
275.0
[10.83]
254.0 - 356.0
1.75 ± 0.1
[10.0
- 14.0]
[0.069 ± 0.004]
10x4 ± 0.1 = 40
± 0.2
[10
x 0.157 ± 0.004 = 1.575
± 0.008]
1.5 DIA. MAX.
[0.059]
4 ± 0.1
[0.157 ± 0.004]
76.0
[2.99]
100.0
[3.94]
25.0
[0.98]
0.4 ± 0.05
[0.016 ± 0.002]
8.5 ± 0.1
[0.335 ± 0.004]
80.0
[3.15]
8.6 ± 0.1
[0.339 ± 0.004]
7.5 ± 0.1
[0.295 ± 0.004]
16 +0.3 / -0.1
[0.630
+0.012 / -0.004]
1.5 DIA. MAX.
[0.059]
Direction of Feed
17.7
[0.697]
Direction of Feed
12 ± 0.1
[0.472 ± 0.004]
For 'LS' Type Shaped Lead Items
10x4 ± 0.1 = 40
± 0.2
[10x.157
± 0.004 = 1.575
± 0.008]
0.5 ± 0.05
[0.020 ± 0.002]
1.9
[0.075]
1.75 ± 0.1
[0.069 ± 0.004]
1.5 DIA. MAX.
[0.059]
4 ± 0.1
[0.157 ± 0.004]
275.0
[10.82]
100.0
[3.93]
76.0
[2.99]
25.0
[0.98]
11.5 ± 0.1
[0.453 ± 0.004]
24 +0.3 / -0.1
[0.945
+0.019 / -0.004]
25.7
[1.01]
11.75 ± 0.1
[0.463 ± 0.004]
8 ± 0.1
[0.315 ± 0.004]
Direction of Feed
0.5 ± 0.01
[0.020 ± 0.004]
9 ± 0.1
[0.354 ± 0.004]
1.5 DIA. MAX.
[0.059]
16 ± 0.1
[0.630 ± 0.004]
©2013 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.
CG/CG2 Series
Revised: January 10, 2013
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