V385SM7 Littelfuse Inc, V385SM7 Datasheet - Page 3

• Manufacturer Part Number: V385SM7
• Description: VARISTOR 385VRMS 1.2KA 7MM SMD
• Manufacturer: Littelfuse Inc
• Series: SM7r

Specifications of V385SM7

• Varistor Voltage: 682V
• Current-surge: 1.2kA
• Number Of Circuits: 1
• Maximum Ac Volts: 385VAC
• Maximum Dc Volts: 505VDC
• Energy: 27J
• Package / Case: Non-Standard SMD
• Voltage Rating Dc: 505 V
• Voltage Rating Ac: 385 V
• Clamping Voltage: 1025 V
• Peak Surge Current: 1200 A
• Capacitance: 60 pF
• Operating Temperature Range: - 40 C to + 85 C
• Mounting: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: F3553TR

©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/sm7.html for current information.
Lead (Pb) Soldering Recommendations
Wave soldering is the most strenuous of the processes.
To avoid the possibility of generating stresses due to
process should be rigidly controlled.
ensure that the SM7 chip is not subjected to a thermal
still necessary to ensure that any further thermal shocks
are avoided. One possible cause of thermal shock is hot
printed circuit boards being removed from the solder
process and subjected to cleaning solvents at room
temperature. The boards must be allowed to cool gradually
Lead–free (Pb-free) Soldering Recommendations
compatible.
standards and practices. There are multiple choices of all
optimum combination for their process as processes vary
considerably from site to site.
Varistor Products
Surface Mount Varistors > SM7 Series
Revision: January 10, 2011
Reflow Solder Profile
Wave Solder Profile
Lead–free Re-flow Solder Profile
300
250
200
150
100
250
200
150
100
300
250
200
150
100
50
50
50
0
0
0
0.0
0
0
0.5
0.5
MAXIMUM TEMPERATURE 250˚C,
TIME WITHIN 5˚C OF PEAK
20 SECONDS MAXIMUM
1.0
PREHEAT ZONE
PREHEAT ZONE
1.0
1.0
PREHEAT DWELL
FIRST PREHEAT
2.0
MAXIMUM TEMPERATURE
1.5
1.5
TIME (MINUTES)
TIME (MINUTES)
MAXIMUM WAVE 260°C
TIME (MINUTES)
RAMP RATE
<3˚C/s
3.0
2.0
230°C
2.0
SECOND PREHEAT
RAMP RATE
<2°C/s
2.5
4.0
2.5
ABOVE 183°C
3.0
SECONDS
40-80
5.0
60 - 150 SEC
3.0
> 217˚C
3.5
SM7 Series Varistor
6.0
3.5
4.0
4.0
4.5
7.0