Littelfuse RA Varistor Series - Manual (Page 7)

© 2013 Littelfuse, Inc. 199
Revised: May 8, 2013
Varistor Products
RA Varistor Series
Low Profile / Application Specific Varistors > RA Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ra.html for current information.
RA Series
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
5°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) 250+0/-5°C
Time within 5°C of actual peak
Temperature (tp)
20 – 40 seconds
Ramp-down Rate 5°C/second max
Time 25°C to peak Temperature (TP) 8 minutes Max.
Do not exceed 260°C
0
50
100
150
200
250
300
0 0.5 1 1.5 2 2.5 3 3.5 4
TIME(MINUTES)
T
E
M
P
E
RAT
URE
(
ºC)
Maximum Wave 240C
Lead–free Profile
0
50
100
150
200
250
300
0 0.5 1 1.5 2 2.5 3 3.5 4
TIME(MINUTES)
T
EMPER
A
T
U
R
E
(º
C
)
Maximum Wave 260C
Non Lead–free Profile
Wave Solder Profile
Operating/Storage
Temperature
-55°C to +125°C / -55°C to +150°C
Humidity Aging
+85°C, 85% RH, 1000 hours
+/-10% Voltage
Thermal Shock
+85°C to -40°C 10 times
+/-10% Voltage
Solvent Resistance MIL–STD–202, Method 215F
Moisture Sensitivity Level 1, J–STD–020C
Lead Material Tin–Coated Copper
Soldering
Characteristics Solderability per MIL–STD–202,
Method 208E
Insulating Material
Cured, flame retardant epoxy polymer
meets UL94V–0 requirements.
Device Labeling
Marked with LF, voltage, amperage rating,
and date code.
Physical Specifications Environmental Specifications
Figure 16
Figure 17