242 Series Datasheet by Littelfuse Inc.

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© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/31/18
Special Application Fuses
242 Series Barrier Fuse
242 Series Barrier Fuse
Description
Agency Approvals
Agency Agency File Number Ampere Range
E10480 0.040A - 0.250A
Electrical Characteristics
Features
Applications
RoHS
% of Ampere
Rating Opening Time
100% 4 hours, Minimum
300% 10 seconds, Maximum
1000% 0.002 seconds, Maximum
High interrupting rating
suitable for intrinsic
safety protection of
hazardous locations
equipment.
Available in both axial
lead and surface mount.
RoHS compliant and
Halogen-free.
Electrical Characteristics
Ampere Rating
(A) Amp Code
Body
Color
Coding
Interrupting
Rating
Nominal
Cold
Resistance
(Ohms)
Nominal Melting
I2t (A2 Sec.)
Agency
Approvals
0.040 .040 Gold
4000A @
250VAC/VDC
16.48 0.000078 x
0.050 .050 Red 11.34 0.000103 x
0.080 .080 Green 8.19 0.000214 x
0.100 .100 Blue 3.60 0.000977 x
0.125 .125 Orange 3.78 0.001026 x
0.160 .160 Violet 3.00 0.00157 x
0.200 .200 Brown 2.68 0.0025 x
0.250 .250 Black 1.6 0.00579 x
The 242 Series fuse is designed for barrier circuits in intrinsic
safety applications relating to Hazardous Locations. Ranging
from 40mA to 250mA, the 242 Series provides overcurrent
protection solutions to fit many Hazardous Location
barrier applications.
Intrinsic saftey electrical
equipment; Electrical
connections and
components; Test
equipment
Barriers providing
intrinsically safe outputs to
Hazardous Locations
Additional Information
Datasheet Samples
Resources
Specifications are subject to change without notice. Application testing is strongly recommended.
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate 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.
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© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/31/18
Special Application Fuses
242 Series Barrier Fuse
Average Time Current Curves
0.1
0.01
0.001
0.0001
1
10
100
TIME IN SECONDS
.050A
.080A
.100A
.200A
.125A
.160A
.250A
0.01 0.1 110 100 1000
CURRENT IN AMPERES
.040A
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 secs
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 Temp. (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
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
-55 -35 -15 5 25 -45 65 85 105 125
Temperature (°C)
0%
20%
40%
60%
80%
100%
120%
140%
Percent of Rating
Temperature De-Rating Curve
Product Characteristics
Operating Temperature –40OC to 125OC (Consider re-
rating)
Thermal Shock Withstands 5 cycles of – 55OC to
125OC
Vibration Per MIL-STD-202 Method 201
Insulation Resistance
(After Opening) Greater than 10,000 ohms.
Material Information
Body Ceramic
Leads Tin-Plated Copper
Endcaps Silver-Plated Brass
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© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/31/18
Special Application Fuses
242 Series Barrier Fuse
Part Numbering System
0242.050UAT1
SERIES
AMP CODE
QUANTITY & PACKAGING CODE
Refer to Amp Code column in the
Electrical Specifications table.
HAT1 = 100 pcs, Axial Leaded, Ammo Pack T1 Tape
UAT1 = 500 pcs, Axial Leaded, Ammo Pack T1 Tape
UR = 500 pcs, Surface Mount, Tape & Reel
Dimensions
3.02mm
(.119")
8.40mm
(.331")
4.00mm
4.60mm
(.181")
1.90mm
(.075")
3.02mm
(.119")
8.40mm
(.331")
4.60mm
(.181")
2.90mm
3.20mm
9.80mm
1.90
mm
(.075")
.635mm
(.025")
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate 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.

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