Littelfuse Inc. 的 438GT Series 规格书

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© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 02/15/18
Surface Mount Fuses
Ceramic Fuse > 438GT Series
438GT Series – 0603 Fast-Acting Fuse
Description
The 438GT Series is a 100% Lead-free, RoHS compliant
and Halogen-free fuse series designed specifically to
provide over-current protection to circuits that operate
under high working ambient temperature up to 150ºC.
The general design ensures excellent temperature stability
and performance reliability.
The high I²t values which is typical in the Littelfuse Ceramic
Fuse family ensure high inrush current withstand capability.
Agency Approvals
AGENCY AGENCY FILE NUMBER AMPERE RANGE
E10480 2A – 6A
29862 2A – 6A
Features
Electrical Characteristics for Series
• Operating Temperature
from -55ºC to +150ºC
• 100% Lead-free,
RoHS compliant and
Halogen-free
• Suitable for both leaded
and lead-free reflow/
wave soldering
% of Ampere
Rating Ampere Rating Opening Time at 25ºC
100% 2A – 6A 4 Hours, Minimum
250% 2A – 6A 5 Seconds, Maximum
Applications
Ampere
Rating
(A)
Amp
Code
Max.
Voltage
Rating (V)
Interrupting Rating
(AC/DC) 1
Nominal
Resistance
(Ohms) 2
Nominal
Melting I2t
(A2Sec.) 3
Nominal Voltage
Drop At Rated
Current (V) 4
Nominal Power
Dissipation At
Rated Current (W)
Agency Approvals
2 002. 32
50A @ 32VDC/12VAC
0.0490 0.181 0.110 0.220 x x
2.5 02.5 32 0.0364 0.240 0.094 0.235 x x
3 003. 32 0.0264 0.439 0.082 0.246 x x
3.5 03.5 32 0.0210 0.647 0.078 0.273 x x
4 004. 32 0.0164 0.739 0.075 0.300 x x
5 005. 32 0.0127 0.747 0.072 0.360 x x
6 006. 24 50A @ 24VDC/12VAC 0.0086 1.444 0.070 0.420 x x
Electrical Specifications by Item
Notes:
1. AC Interrupting Rating tested at rated voltage with unity power factor.
DC Interrupting Rating tested at rated voltage with time constant <0.8 msec.
2. Nominal Resistance measured with <10% rated current.
3. Nominal Melting I²t measured at 1msec. opening time.
4. Nominal Voltage Drop measured at rated current after temperature has stabilized.
RoHS
Pb
• Handheld Electronics
• LCD Displays
• Battery Packs
• Hard Disk Drives
• SD Memory Cards
Devices designed to carry rated current for 4 hours minimum. It is recommended that
devices be operated continuously at no more than 80% rated current. See “Temperature
Re-rating Curve”for additional re-rating information.
Devices designed to be mounted with marking code facing up.
Specifications are subject to change without notice. Application testing is strongly recommended.
Additional Information
Datasheet Samples
Resources
HH/H muzoomm 2. ms:
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 02/15/18
Surface Mount Fuses
Ceramic Fuse > 438GT Series
Average Time Current Curves
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) 3°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)260+0/-5 °C
Time within 5°C of actual peak
Temperature (tp)10 – 30 seconds
Ramp-down Rate 6°C/second max.
Time 25°C to peak Temperature (TP)8 minutes max.
Do not exceed 260°C
Soldering Parameters
Temperature Re-rating Curve
40
60
80
100
120
140
-65 -45 -25 -5 15 35 55 75 95 115 135 15 5
TEMPERATURE (°C)
PERCENT OF RATING
Example:
For continuous operation at 75 degrees celsius, the fuse should be rerated as follows:
I = (0.80)(0.85)IRAT = (0.68)IRAT
Note:
1. Re-rating depicted in this curve is in addition to the standard re-rating of 20% for
continuous operation.
Wave Soldering 260°C, 10 seconds max.
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
0.001
0.01
0.1
1
10
100
0.11 10 10
0
TIME IN SECONDS
CURRENT IN AMPERES
2A
2.5
A
3A
4A
5A
6A
3.5
A
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© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 02/15/18
Surface Mount Fuses
Ceramic Fuse > 438GT Series
Materials
Body: Advanced Ceramic
Terminations: Ag / Ni / Sn (100% Lead-free)
Element Cover Coating: Lead-free Glass
Moisture
Sensitivity Level IPC/JEDEC J-STD-020, Level 1
Solderability IPC/EIC/JEDEC J-STD-002, Condition B
Humidity MIL-STD-202, Method 103, Conditions D
Resistance to
Solder Heat MIL-STD-202, Method 210, Condition B
Product Characteristics
Moisture Resistance MIL-STD-202, Method 106
Thermal Shock MIL-STD-202, Method 107,
Condition B-3
Mechanical Shock MIL-STD-202, Method 213,
Condition A
Vibration MIL-STD-202, Method 201
Vibration,
High Frequency
MIL-STD-202, Method 204,
Condition D
Dissolution of
Metallization
IPC/EIC/JEDEC J-STD-002,
Condition D
Terminal Strength IEC 60127-4
Dimensions
1.582 ± 0.152
[0.062 ± 0.006]
0.74
[0.029]
1. 00
[0.039]
1.94
[0.076]
0.60
[0.024]
0.508 ± 0.102
[0.02 ± 0.004]
0.83 ± 0.152
[0.032 ± 0.006]
0.432 +/- 0.150
[0.017 +/- 0.006]
Packaging
Part Marking System
Packaging Option Packaging Specification Quantity Quantity &
Packaging Code
8mm Tape and Reel EIA-481, IEC 60286, Part 3 3000 WR
Part Numbering System
0438 005. W R GT
SERIES
AMP CODE
QUANTITY CODE
PACKING CODE
W = 3000 pcs
R = Reel Pack
Amp Code Marking Code
002. N
02.5 O
003. P
03.5 R
004. S
005. T
006. U
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently eval-
uate the suitability of and test each product selected for their own applications.Littelfuse products are not designed for, and
may not be used in, all applications.Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.