Gas Discharge Tube (GDT) Products
© 2015 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 01/13/15
PMT3(310) Series
Description
Littelfuse three electrode PMT3(310) series GDTs are
designed primarily to protect telecommunications
equipment requiring simultaneous crowbar action
of two signal lines. GDTs function as switches;
dissipating a minimum amount of energy and can
handle much higher currents than other types of
transient voltage protection.
Features
•Ruggedceramic-metal
construction
•Lowcapacitance(<1.5
pF)
•Availablewithor
withoutfail-safeclip
•Availablewithor
without leads
•Availablewithvarious
lead spacings
•TestedtoREAPE-80
Applications
•Telephoneinterface
•Telephonelinecards
•Repeaters
•Modems
•Linetestequipment
Agency Approvals
AGENCY AGENCY FILE NUMBER
E128662
NOTES:
1. Totalcurrentthroughcenterelectrode,testedinaccordancewithITU-TRecK.12andREAPE80
EndoflifeDC:50%ofminimuminitialDCbreakdownvoltageto150%ofmaximuminitialDCbreakdownvoltagelimit.
Impulse:lessthan150%ofinitialimpulsebreakdowndownlimit.
Electrical Characteristics
Part Number
Device Specifications Life Ratings
DCBreakdown
(I-g)
@500V/s
DC
Voltage
100V/
μSec.
DC
Voltage
1kV/
μSec.
Insulation
Resistance
Capaci-
tance
(@1Mhz)
AC
Current
11 cycles @
50-60Hz1
AC
Current
50Hz1Sec.
x101
Surge
Current
8/20μSec
x101
Max
Single
Surge
8/20
μSec1
Max
Single
Surge
10/350
μSec1
Surge
Life
10/1000
μSec
x4001
Min Typ Max Min
PMT3(310)075 60 75 90 500 650
1010 Ω
(at 50V)
1.5pf 130Amps 20Amps 20kA 25kA 5kA 1kA
PMT3(310)090 72 90 108 500 650
PMT3(310)150 120 150 180 500 600
1010 Ω
(at 100V)
PMT3(310)230 184 230 276 600 700
PMT3(310)250 200 250 300 600 700
PMT3(310)350 280 350 420 900 1000
PMT3(310)400 320 400 480 900 1000
PMT3(310)500 400 500 600 110 0 1200
3 Electrode GDT Graphical Symbol
a
e
ba = TIP
b=RING
e=GROUND
(center electrode)
PMT3(310) Series
RoHS
Gas Discharge Tube (GDT) Products
© 2015 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 01/13/15
PMT3(310) Series
Product Characteristics
Materials DullTinPlate17.5±12.5Microns
withCeramicInsulator
Product Marking Littelfuse‘LF’marking,Voltageand
date code.
Glow to arc
transition current ~1Amp
Glow Voltage
~60-200Volts
Reflow Condition Pb – Free assembly
Pre Heat
- Temperature Min (Ts(min))150°C
- Temperature Max (Ts(max))200°C
- Time (Min to Max) (ts)60–180secs
Average ramp up rate (Liquidus Temp
(TL) to peak 3°C/secondmax
TS(max) to TL - Ramp-up Rate 5°C/secondmax
Reflow - Temperature (TL) (Liquidus) 217°C
- Temperature (tL)60–150seconds
Peak Temperature (TP)260+0/-5°C
Time within 5°C of actual peak
Temperature (tp)10 – 30 seconds
Ramp-down Rate 6°C/secondmax
Time 25°C to peak Temperature (TP)8minutesMax.
Do not exceed 260°C
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:
(DependsonFluxActivationTemperature) (TypicalIndustryRecommendation)
TemperatureMinimum: 100°C
TemperatureMaximum: 150°C
PreheatTime: 60-180seconds
Solder Pot Temperature: 280°CMaximum
Solder Dwell Time: 2-5seconds
Recommended Process Parameters:
SolderIronTemperature:350°C+/-5°C
HeatingTime:5secondsmax.
Note:SurgeArrestorswithaFailsafemechanism should be
individually examined after soldering
Storage and Operational
Temperature
-40to+90°C
Transverse Voltage (Delay Time)
TestedtoITU-TRec.K.12 <0.2µSec
Arc Voltage
~10to35Volts
Holdover Voltage
TestedtoITU-TRec.K.12&REAPE80 <150mS
Gas Discharge Tube (GDT) Products
© 2015 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 01/13/15
PMT3(310) Series
Device Dimensions
Part Numbering System
PMT3(310) XXX XX X
Breakdown Voltage
075 = 75V
090 = 90V
150 = 150V
230 = 230V
250 = 250V
350 = 350V
400 = 400V
500 = 500V
Series
PMT3(310)
Device Type
See Dimensions section:
01 = Type 01
04 = Type 04
06 = Type 06
14 = Type 14
Packaging Option Code
Blank = No Failsafe
F = With Failsafe
Packaging
Device Type Description Quantity
Type 01 100pcs/trayx5trayspercarton 500
Type04 100pcs/trayx5trayspercarton 500
Type06 100pcs/trayx5trayspercarton 500
Type14 50pcs/trayx5trayspercarton 250
8.1
[0.319]
10.10
[0.398]
9.9
[0.354]
9.9
[0.354]
10.10
[0.398]
4.4± 0.3
[0.173± 0.12]
4.4± 0.3
[0.173± 0.12]
15
[0.590]
16.8
[0.661]
4.4
[0.173]
1.0 DIA.
[0.039]
12.4 ± 1
[0.488 ± 0.039]
11. 8
[0.464]
11.8
[0.464]
8.1.
[0.319]
9.9
[0.354]
16.8
[0.661]
11.8
[0.464]
6.35 ± 0.5
[0.25 ± 0.25]
15
[0.590]
1.0 DIA.
[0.039]
8.1 DIA. MAX.
[0.319]
10.10
[0.398]
14.7
[0.579]
6.35 ± 0.5
[0.25 ± 0.25]
10.10
[0.398]
22
[0.866] 1.0 DIA.
[0.039]
50 ± 3
[1.968 ± 0.118 ]
8.1 DIA. MAX.
[0.319]
11.8
[0.464]
23.8
[0.937]
9.0
[0.354]
0.3mm
Minimum
Gap
0.3mm
Minimum
Gap
0.3mm
Minimum
Gap
Mounting Area
9.0
[0.354]
Mounting Area
9.0
[0.354]
Mounting Area
9.0
[0.354]
Mounting Area
0.3mm
Minimum
Gap
Type 04 - Shaped Radial Leads
Type 06 - Straight Radial Leads
Type 14 - Straight "T" Leads
Type 01 - Surface Mount Core
NOTE: Failsafe option dimensions shown in green.
Part Number Available Package Option
Type 01 Type 04 Type 06 Type 14
PMT3(310)075 X
PMT3(310)090 X
PMT3(310)150 X X X X
PMT3(310)230 X X
PMT3(310)250 X X X X
PMT3(310)350 X X
PMT3(310)400 X X
PMT3(310)500 X X