0437.250WR Littelfuse Inc, 0437.250WR Datasheet - Page 2

• Manufacturer Part Number: 0437.250WR
• Description: FUSE 125V .250A FAST SMD 1206
• Manufacturer: Littelfuse Inc
• Series: 437r

Specifications of 0437.250WR

• Fuse Type: Fast Acting
• Voltage - Rated: 125VAC, 125VDC
• Current: 250mA
• Package / Case: 1206 (3216 Metric)
• Size / Dimension: 0.126" L x 0.063" W x 0.032" H (3.20mm x 1.60mm x 0.82mm)
• Mounting Type: Surface Mount
• Operating Temperature: -55°C ~ 150°C
• Dc Cold Resistance: 2.29 Ohm
• Melting I²t: 0.003
• Current Rating: 0.25 Amp
• Voltage Rating: 125 Volts
• Fuse Size / Group: 1206
• Termination Style: SMD/SMT
• Body Material: Ceramic
• Product: Surface Mount Fuse
• Interrupt Rating: 50 Amps
• Operating Temperature Range: - 55 C to + 150 C
• Resistance: 2.29 Ohms
• Voltage Rating Vac: 125V
• Voltage Rating Vdc: 125V
• Fuse Current: 250mA
• Breaking Capacity: 50A @ 125VAC/VDC
• Blow Characteristic: Fast Acting
• Fuse Case Style: 1206
• External Depth: 1.67mm
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Color: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: F2877TR

Note:
1. Rerating depicted in this curve is in addition to the standard rerating of 20% for
437 Series
Temperature Rerating Curve
Soldering Parameters
Reflow Condition
Pre Heat
Average Ramp-up Rate (Liquidus Temp
(T
T
Reflow
Peak Temperature (T
Time within 5°C of actual peak
Temperature (t
Ramp-down Rate
Time 25°C to peak Temperature (T
Do not exceed
Wave Soldering
continuous operation.
For continuous operation at 75 degrees celsius, the fuse should be rerated as follows:
I = (0.80)(0.85)I
S(max)
L
140
120
100
) to peak)
80
60
40
-65
to T
L
-45
RAT
- Ramp-up Rate
- Temperature Min (T
- Temperature Max (T
- Time (Min to Max) (t
- Temperature (T
- Temperature (t
= (0.68)I
-25
p
)
RAT
-5
P
)
TEMPERATURE (°C)
15
L
L
)
) (Liquidus)
Introduction to Circuit Protection
260°C, 10 seconds max.
Introduction to Circuit Protection
35
s(min)
s(max)
s
)
P
55
)
)
)
75
150°C
200°C
3°C/second max.
5°C/second max.
217°C
260
6°C/second max.
8 minutes max.
260°C
95
+0/-5
115
Surface Mount Fuses
°C
Ceramic Fuse > 437 Series
135
155
18
Transientology
Average Time Current Curves
T
T
S(max)
0.001
S(min)
0.01
25
100
0.1
T
T
10
1
P
L
0.1
time to peak temperature
Please refer to www.littelfuse.com/series/437.html for current information.
(t 25ºC to peak)
t
Preheat
S
CURRENT IN AMPERES
1
Specifications are subject to change without notice.
Ramp-up
10
t
t
P
L
Time
© 2009 Littelfuse, Inc.
Critical Zone
Ramp-down
T
L
100
to T
P