0429007.WRML Littelfuse Inc, 0429007.WRML Datasheet - Page 2

• Manufacturer Part Number: 0429007.WRML
• Description: FUSE 7A 24V FAST SMD 1206
• Manufacturer: Littelfuse Inc
• Series: 429r
• Type: Surface Mount Fusesr

Specifications of 0429007.WRML

• Fuse Type: Fast Acting
• Voltage - Rated: 24VAC, 24VDC
• Current: 7A
• Package / Case: 1206 (3216 Metric)
• Size / Dimension: 0.126" L x 0.063" W x 0.045" H (3.20mm x 1.60mm x 1.14mm)
• Mounting Type: Surface Mount
• Operating Temperature: -55°C ~ 90°C
• Dc Cold Resistance: 0.009 Ohm
• Melting I²t: 3.6
• Current Rating: 7 Amps
• Voltage Rating: 63 Volts
• Fuse Size / Group: 1206
• Termination Style: SMD/SMT
• Body Material: Epoxy
• Dimensions: 3.18 mm L x 1.52 mm W
• Product: Surface Mount Fuse
• Mounting Style: SMD/SMT
• Brand/series: 429 Series
• Current, Rating: 7 A
• Material, Body: Epoxy Substrate
• Primary Type: Chip
• Resistance, Dc: 0.00925 Ohms
• Size: 1206
• Termination: SMT
• Voltage, Rating: 24 VAC/VDC
• Dc: N/A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Color: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Note:
1. Derating depicted in this curve is in addition to the standard derating of 25% for
Example:
429 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 70 degrees celsius, the fuse should be deratedas follows:
I = (0.75)(0.80)I
S(max)
L
) to peak
to T
L
RAT
- Ramp-up Rate
- Temperature Min (T
- Temperature Max (T
- Time (Min to Max) (t
- Temperature (T
- Temperature (t
= (0.60)I
p
)
RAT
Thin Film > 1206 Size > Very Fast-Acting > 429 Series
P
)
L
L
)
) (Liquidus)
260°C, 10 seconds max.
Introduction to Circuit Protection
Introduction to Circuit Protection
s(min)
s(max)
s
)
P
)
)
)
Pb – Free assembly
150°C
200°C
60 – 180 secs
5°C/second max
5°C/second max
217°C
60 – 150 seconds
250
20 – 40 seconds
5°C/second max
8 minutes Max.
260°C
+0/-5
Surface Mount Fuses
°C
Revised: January 7, 2009
34
Transientology
Average Time Current Curves
T
T
S(max)
S(min)
25
T
T
P
L
0.001
0.01
100
0.1
10
1
0.1
time to peak temperature
Please refer to www.littelfuse.com/series/429.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
P
t
L
Time
© 2009 Littelfuse, Inc.
100
Critical Zone
Ramp-down
T
L
to T
P