©2011 Littelfuse, Inc.
Gas Discharge Tube (GDT) Products
20
Revised: September 26, 2011 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
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.
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
t3VHHFE$FSBNJD.FUBM
construction
t-PX$BQBDJUBODF
(<1.5pf)
t.FFUT3&"1&
t"WBJMBCMFJOTVSGBDF
mount, and a variety of
lead options options
Applications
t$PNNVOJDBUJPOMJOFT
and equipment
t$"57FRVJQNFOU
t5FTUFRVJQNFOU
t%BUBMJOFT
t1PXFSTVQQMJFT
t*OTUSVNFOUBUJPODJSDVJUT
t.FEJDBMFMFDUSPOJDT
t"%4-FRVJQNFOU
t5FMFDPN4-*$
protection
AGENCY AGENCY FILE NUMBER
&
&
Agency Approvals
CG/CG2 Series
2 Electrode GDT Graphical Symbol
©2011 Littelfuse, Inc.
Gas Discharge Tube (GDT) Products
21
Revised: September 26, 2011
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
CG/CG2 Series
Electrical Characteristics
Part
Number
Device Specifications (at 25°C) Life Ratings
DC Breakdown
in Volts
(@100V/s)
Impulse
Break-
down
in Volts
(@100V/μs)
Impulse
Break-
down In
Volts
(@1 Kv/μsec)
Insulation
Resistance
Capaci-
tance
!.)[
Arc
Voltage
(on state
Voltage)
!"NQ
.JO
Surge
Life
!"
10/1000μs)
Nominal
Impulse
Discharge
Current
T
Nominal
AC
Discharge
Current
(10x1sec
!)[
AC
Dischage
Current
(9 cycle
!)[
DC
Holdover
Voltage2
Max
Impulse
Discharge
Current
"QQMJDBUJPO
!T
MIN TYP MAX MAX MIN MAX TYP TYP
CG75
60 75 90 400 650
1010ȍ
(at 50V)
1.5 pf 15 V 400
shots
10 shots
(@20kA)320 A 100 A
52 V 4kA
CG90
72 90 108 400 600
CG90 SN
72 90 108 400 600
CG110
88 110 132 450 600 80 V
2.5kA
CG2145
116 145 174 500 600
1010ȍ
(at 100V)
CG2145 SN
120 145 174 500 600
CG2230
195 230 265 600 700
135 V
CG2230 SN
184 230 276 600 700
CG2250
213 250 288 625 725
CG2250 SN
200 250 300 625 725
CG2300
255 300 345 700 800
CG2300 SN
240 300 360 700 800
CG2350
297 350 403 750 900
CG2350 SN
280 350 420 750 900
CG2420
357 420 483 800 1000
CG2470
400 470 540 850 1200
CG2470 SN
376 470 564 850 1200
CG2600
510 600 690 1000 1400
CG2600 SN
480 600 720 1000 1400
CG28001
680 800 920 1200 1500 10 shots
(@10kA) 10 A
CG210001
850 1000 1 150 1500 1600 65 A
/05&4
5FTUFEUP6-5IJSE&EJUJPO
3FGFSFODF3&"1&"5FTUFEUP*5653FD,BOE3&"1&N4FD
Product Characteristics
Materials
LS, Axial:
%FWJDF/JDLFM1MBUFEo.JDSPOT
-FBE8JSFT5JO1MBUFE.JDSPOT
$POTUSVDUJPO$FSBNJD*OTVMBUPS
Core:
%FWJDF5JO1MBUFE.JDSPOT
$POTUSVDUJPO$FSBNJD*OTVMBUPS
MS:
%FWJDF%VMM5JO1MBUFEo.JDSPOT
$POTUSVDUJPO$FSBNJD*OTVMBUPS
Product Marking LF Logo, Voltage and date code; Black in
positive print
Glow to arc
transition current "NQT
Glow Voltage
7PMUT
Storage and
Operational
Temperature
-40 to +90
Maximum Follow
On Current
1
7PMUTSNT"NQT
7BOE7EFWJDFTUFTUFEUP6-SEFEJUJPO
©2011 Littelfuse, Inc.
Gas Discharge Tube (GDT) Products
22
Revised: September 26, 2011 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
CG/CG2 Series
Device Dimensions
[0.331 ± 0.012]
8.4 ± 0.3
[0.239 ± 0.012]
6.07 ± 0.3
[0.0157 ± 0.0012]
0.40 ± 0.03
0.004
2 Surfaces
[0.032]
0.80
[0.388 ± 0.012]
9.85 ± 0.30
[0.439 ± 0.012]
11.15 ± 0.30
[0.331 ± 0.012]
8.40 ± 0.3
8.10 Max.
[0.319 DIA Max.]
9.85
[0.388]
11.65
[0.459]
8.60
[0.339]
1.80
[0.071]
TOP VIEWPROFILE VIEW
SOLDER PAD LAYOUT
6.05 ± 0.2
[0.238 ± 0.0079]
5.58 [0.220]
ø8.30±0.1
R5.29 [R0.208]
4 ± 0.2
[0.157 ± 0.0079]
8.30 ± 0.1
[0.327 ± 0.0039]
8.71 [0.343]
2.29 [0.090]
5.89 [0.232]
0.47 ± 0.1
[0.019 ± 0.0039]
9.30 ± 0.2
[0.366 ± 0.0079]
TOP VIEW
PROFILE VIEW SEMI–PROFILE VIEW
SOLDER PAD LAYOUT
Leaded 'LS' Type Shaped Lead Devices
'MS' Type Devices
Leaded 'L' Type Straight Axial Devices
Core Devices
8.10 DIA. MAX
.
[0.319]
6.07 ± 0.15
0.81 DIA. TYP.
[0.032]
62 ± 2
[0.239 ± 0.006]
TOP VIEW
PROFILE VIEW
6.07 ± 0.15
[0.239 ± 0.0059]
5.89 [0.232]
8.10 Max.
[0.032 Max.]
8.10 Max.
TOP VIEW PROFILE VIEW SEMI–PROFILE VIEW
0.47 ± 0.1
[0.019 ± 0.0039]
©2011 Littelfuse, Inc.
Gas Discharge Tube (GDT) Products
23
Revised: September 26, 2011
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
CG/CG2 Series
Reflow Condition 1Co'SFFBTTFNCMZ
Pre Heat
- Temperature Min (Ts(min))150°C
- Temperature Max (Ts(max))200°C
- Time (Min to Max) (ts)oTFDT
Average ramp up rate (Liquidus Temp
(TL) to peak ¡$TFDPOENBY
TS(max) to TL - Ramp-up Rate 5°C/second max
Reflow - Temperature (TL) (Liquidus) 217°C
- Temperature (tL)oTFDPOET
Peak Temperature (TP)+0/-5 °C
Time within 5°C of actual peak
Temperature (tp)oTFDPOET
Ramp-down Rate ¡$TFDPOENBY
Time 25°C to peak Temperature (TP)NJOVUFT.BY
Do not exceed ¡$
Soldering Parameters - Reflow Soldering (Surface Mount Devices)
Time
Temperature
TP
TL
TS(max)
TS(min)
25
tP
tL
tS
time to peak temperature
(t 25ºC to peak)
Ramp-down
Ramp-up
Preheat
Critical Zone
TL to TP
Soldering Parameters - Wave Soldering (Thru-Hole Devices)
Soldering Parameters - Hand Soldering
Dwell Time
0
20
40
60
80
100
120
140
160
180
200
220
240
260
280
300
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
Time (Seconds)
Temperature (°C) - Measured on bottom side of board
Cooling Time
Preheat Time
Wave Parameter Lead-Free Recommendation
Preheat:
%FQFOETPO'MVY"DUJWBUJPO5FNQFSBUVSF 5ZQJDBM*OEVTUSZ3FDPNNFOEBUJPO
5FNQFSBUVSF.JOJNVN 100° C
5FNQFSBUVSF.BYJNVN 150° C
1SFIFBU5JNF TFDPOET
Solder Pot Temperature: ° $.BYJNVN
Solder Dwell Time: 2-5 seconds
Recommended Process Parameters:
4PMEFS*SPO5FNQFSBUVSF¡$¡$
)FBUJOH5JNFTFDPOETNBY
©2011 Littelfuse, Inc.
Gas Discharge Tube (GDT) Products
24
Revised: September 26, 2011 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
CG/CG2 Series
Packaging Dimensions
24 +0.3 / -0.1
[0.945 +0.019 / -0.004]
11.5 ± 0.1
[0.453 ± 0.004]
1.75 ± 0.1
[0.069 ± 0.004] 1.5 DIA. MAX.
[0.059]
1.5 DIA. MAX.
[0.059] 16 ± 0.1
[0.630 ± 0.004]
0.5 ± 0.05
[0.020 ± 0.002]
0.5 ± 0.01
[0.020 ± 0.004]
10x4 ± 0.1 = 40 ± 0.2
[10x.157 ± 0.004 = 1.575 ± 0.008]
4 ± 0.1
[0.157 ± 0.004]
11.75 ± 0.1
[0.463 ± 0.004]
8 ± 0.1
[0.315 ± 0.004]
9 ± 0.1
[0.354 ± 0.004]
1.9
[0.075]
Direction of Feed
25.7
[1.01]
275.0
[10.82]
100.0
[3.93]
25.0
[0.98]
76.0
[2.99]
For 'LS' Type Shaped Lead Items
22.8
[0.898]
52.4
[2.063]
6.4
[0.252]
<0.8 Max
<1.2 Max. Lead Bend
5.0 Pitch
[0.197]
16 +0.3 / -0.1
[0.630 +0.012 / -0.004]
7.5 ± 0.1
[0.295 ± 0.004]
8.5 ± 0.1
[0.335 ± 0.004]
1.75 ± 0.1
[0.069 ± 0.004] 1.5 DIA. MAX.
[0.059]
1.5 DIA. MAX.
[0.059] 12 ± 0.1
[0.472 ± 0.004]
8.6 ± 0.1
[0.339 ± 0.004]
0.4 ± 0.05
[0.016 ± 0.002]
10x4 ± 0.1 = 40 ± 0.2
[10 x 0.157 ± 0.004 = 1.575 ± 0.008]
4 ± 0.1
[0.157 ± 0.004]
Direction of Feed
17.7
[0.697]
275.0
[10.83]
100.0
[3.94]
25.0
[0.98]
76.0
[2.99]
For 'L' Type Axial Lead Items
Core and 'MS' Type Items
Direction of Feed
254.0 - 356.0
[10.0 - 14.0]
0
.0
15]
©2011 Littelfuse, Inc.
Gas Discharge Tube (GDT) Products
25
Revised: September 26, 2011
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
CG/CG2 Series
Part Numbering System and Ordering Information
Examples:
CG75"OPOMFBEFE7EFWJDF
CG2230L"MFBEFE7EFWJDF
CG2800LTR"MFBEFE7EFWJDFUBQFBOESFFM QFS&*"TUBOEBSE34%
Notes:
CG/CG2 devices with other breakdown voltages in the 75-1000 V range are available upon request.
CG2 XXX XX * XX
Breakdown Voltage
75
90
110
145
230
250
300
350
470
600
800
1000
Series
CG -- for 75, 90, or 110V
CG2 -- for 145V to 1000V
Lead Option Code
Option Code*
(Blank) = No Leads / Core
L = Straight Leads
LS = Shaped Leads
MS = Surface Mount
Packaging Option Code
(Blank) = No Leads / Core, Bulk Bag - 400 pcs
L(Blank) = Straight Lead, Tray - 50 pcs
LTR = Straight Lead, Tape & Reel per EIA RS-296-E - 500 per reel
LTE = Straight Lead, Tape & Reel per IEC 60286-1 - 500 per reel
LS(Blank) = Shaped Lead (see LS dimensions), Tape & Reel - 500 per reel
SN = may have different DC Breakover
Voltage Limit. Please refer to Electrical
Characteristics table for additional
information.