Network cabinet fan controller

29
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Surface Mount Fuses
Thin Film > 1206 Size > Very Fast-Acting > 466 Series
466 Series
466 Series 
Please refer to www.littelfuse.com/series/466.html for current information.
466 Series Fuse
Description
The 466 Series Fast-Acting Surface Mount Fuse (SMF) 
is a small (1206 size) thin-film device designed for 
secondary protection of circuits used in space constrained 
applications such as hand-held portable electronic devices. 
This series is 100% lead-free and meets the requirements 
of the RoHS directive. New Halogen-Free 466 Series 
fuses are available to order using the “HF” suffix. See Part 
Numbering section for additional information.
Agency Approvals
Agency
Agency File Number
Ampere Range
E10480
125mA - 5A
LR29862
125mA - 5A
Features
Electrical Characteristics for Series
• Product is compatible 
with lead-free solders 
and higher temperature 
profiles
• Product is marked on 
top surface with code to 
allow amperage rating 
identification without 
testing
• Low profile for height 
sensitive applications
• Flat top surface for pick-
and-place operations
• Element-covering material 
is resistant to industry 
standard cleaning 
operations
• Mounting pad and 
electrical performance are 
identical to Littelfuse 429 
and 433 Series products
• Alloy-based element 
construction provides 
superior inrush withstand 
characteristics (I2t) over 
ceramic or glass-based 
1206 chip fuse products
% of Ampere 
Rating
Opening Time at 25OC
100%
4 hours, Minimum
200%
5 sec., Maximum
300%
0.2 sec., Maximum
Applications
Ampere 
Rating
(A)
Amp 
Code
Max
Voltage Rating 
(V)
Interrupting
Rating
Nominal Cold 
Resistance 
(Ohms)
Nominal 
Melting 
I2t (A2sec)
Nom
Voltage Drop 
 (mV)
Nom Power 
Dissipation 
 (W)
Agency Approvals
0.125
.125
125
50A @125 V AC/
DC
4.000
0.00040
552.66
0.0691
x
x
0.200
.200
125
1.160
0.00055
254.28
0.0509
x
x
0.250
.250
125
0.710
0.0010
207.01
0.0518
x
x
0.375
.375
125
0.350
0.0028
169.18
0.0634
x
x
0.500
.500
63
50A @63 V AC/DC
0.248
0.0060
158.47
0.0792
x
x
0.750
.750
63
0.111
0.0276
98.65
0.0740
x
x
1.00
001.
63
0.076
0.0423
89.94
0.0899
x
x
1.25
1.25
63
0.059
0.0640
85.71
0.1071
x
x
1.50
01.5
63
0.048
0.1103
82.97
0.1244
x
x
1.75
1.75
63
0.039
0.1323
80.73
0.1413
x
x
2.00
002.
63
0.031
0.2326
78.73
0.1575
x
x
2.50
02.5
32
50A @32 V AC/DC
0.024
0.3516
76.99
0.1925
x
x
3.00
003.
32
0.020
0.5760
75.99
0.2280
x
x
4.00
004.
32
0.014
1.024
74.50
0.2980
x
x
5.00
005.
32
0.011
1.600
73.75
0.3688
x
x
Electrical Specifications by Item
1.	 Measured at 10% of rated current, 25ºC.
2.	Measured at rated voltage.
• Cell phones
• Battery packs
• Digital cameras
• DVD players
• Hard disk drives
Secondary protection for space constrained applications:
Revised: Jun 16, 2011

Introduction to Circuit Protection
Introduction to Circuit Protection
Transientology
30
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice. 
Surface Mount Fuses
 Thin Film > 1206 Size > Very Fast-Acting > 466 Series
466 Series
Please refer to www.littelfuse.com/series/466.html for current information.
Average Time Current Curves
TIME IN SECONDS
CURRENT IN AMPERES
0.01
0.1
0.1
1
1
10
100
10
100
0.001
4A
3A
2 1/2A
2A
1 3/4A
1 1/2A
1 1/4A
1A
3/4A
1/2A
3/8A
1/4A
1/8A
5A
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 seconds
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
Soldering Parameters
Temperature Rerating Curve
Wave Soldering
260°C, 10 seconds max.
Note:
1.	 Rerating depicted in this curve is in addition to the standard rerating of 25% for 
continuous operation.
Example:
	
For continuous operation at 70 degrees celsius, the fuse should be rerated as follows:
	
I = (0.75)(0.80)IRAT = (0.60)IRAT
2.	The temperature derating curve represents the nominal conditions. For questions 
about temperature derating curve, please consult Littelfuse technical support for 
assistance.
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

31
© 2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Surface Mount Fuses
Thin Film > 1206 Size > Very Fast-Acting > 466 Series
466 Series
466 Series 
Please refer to www.littelfuse.com/series/466.html for current information.
Dimensions
2.03
(.080")
2.03
(.080")
WAVE SOLDER
REFLOW SOLDER
3.81
(.150")
1.52
(.060")
0.584 ± 0.076
(0.023" ± 0.003")
0.559 ± 0.127
(0.022" ± 0.005")
0.660 ± 0.127
(0.026" ± 0.005")
1.14
(.045")
MARKING CODE VARIES 
WITH AMPERAGE RATING
(SEE CHART)
3.175 ± 0.127
(0.125" ± 0.005")
3.175 ± 0.127
(0.125" ± 0.005")
4.83
(.190")
1.65
(.065")
1.52
(.060")
Sn
Sn
Sn
Cu
Coating
1.524 ± 0.127
(0.060" ± 0.005")
Packaging
Part Numbering System
Materials
Body: Advanced High Temperature Substrate
Terminations: 100% Tin over Nickel over 
Copper
Element Cover Coat: Conformal Coating
Operating 
Temperature
– 55OC to 90OC. 
Consult temperature rerating curve chart.
Thermal Shock
Withstands 5 cycles of –55OC to 125OC
Humidity
MIL-STD-202F, Method 103B, Condition D
Product Characteristics
Vibration
Per MIL-STD-202F, Method 201A
Insulation Resistance 
(After Opening) 
Greater than 10,000 ohms
Resistance to 
Soldering Heat
MIL-STD-202G, Method 210F,    
Condition D
Part Marking System
Packaging Option
Packaging Specification
Quantity
Quantity &
 Packaging Code
8mm Tape and Reel
EIA-481 Rev. D (IEC 60286, part 3)
5000
NR
Amp 
Code
Marking 
Code
.125
B
.200
C
.250 
D
.375 
E
.500 
F
.750 
G
001. 
H
1.25 
J
01.5 
K
1.75 
L
002. 
N
02.5 
O
003. 
P
004. 
S
005. 
T
0466002.NRHF
SERIES
Amp Code
‘HF’ SUFFIX
HALOGEN FREE ITEM
Quantity code
Refer to Amp Code column in the 
Electrical Specifications table. 
The dot is poisitioned before the Pack-
aging Suffix with whole ratings and 
within the numbering sequence for 
fractional ratings.
N = 5000 pcs
packaging code
R = Tape and Reel
Example:
.125 amp product is 
0466.125 NR HF 
(2 amp product shown 
above).