Special Application Fuses 242 Series Barrier Fuse 242 Series Barrier Fuse RoHS Description 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. Features • High interrupting rating • Available in both axial suitable for intrinsic lead and surface mount. safety protection of • RoHS compliant and hazardous locations Halogen-free. Agency Approvals equipment. Agency Agency File Number Ampere Range Applications E10480 0.040A - 0.250A • Intrinsic saftey electrical • Barriers providing equipment; Electrical intrinsically safe outputs to connections and Hazardous Locations components; Test equipment Electrical Characteristics % of Ampere Opening Time Additional Information Rating 100% 4 hours, Minimum 300% 10 seconds, Maximum 1000% 0.002 seconds, Maximum Datasheet Resources Samples Electrical Characteristics Agency Nominal Body Approvals Ampere Rating Interrupting Cold Nominal Melting Amp Code Color (A) Rating Resistance I2t (A2 Sec.) Coding (Ohms) 0.040 .040 Gold 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 4000A @ 3.60 0.000977 x 0.125 .125 Orange 250VAC/VDC 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 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. © 2018 Littelfuse, Inc. Specifications are subject to change without notice. Application testing is strongly recommended. Specifications are subject to change without notice. Revised: 05/31/18

Special Application Fuses 242 Series Barrier Fuse Temperature De-Rating Curve Average Time Current Curves 140% .040A .050A .080A .100A .125A .160A .200A .250A 120% 100 g Ratin100% of 80% ent 60% 10 Perc 40% 20% S 1 D 0% N O -55 -35 -15 5 25 -45 65 85 105 125 C E Temperature (°C) N S E I 0.1 M TI 0.01 0.001 0.0001 0.01 0.1 1 10 100 1000 CURRENT IN AMPERES Soldering Parameters Reflow Condition Pb – Free assembly t P - Temperature Min (T ) 150°C TP s(min) Ramp-up CriTtiLc taol ZToPne Pre Heat - Temperature Max (T ) 200°C s(max) T Average ram- Tpim uep (rmatien (tLoi qmuaidxu) s( tTse)mp 56°0C –/ s1e8c0o nsedc msax erutaTS(maxL) tL (T) to peak re Ramp-down L p Preheat T to T - Ramp-up Rate 5°C/second max mTS(min) S(max) L eT tS - Temperature (T) (Liquidus) 217°C Reflow L - Temperature (t) 60 – 150 seconds L 25 Peak Temperature (T) 250+0/-5 °C time to peak temperature Time P (t 25ºC to peak) Time within 5°C of actual peak Temp. (t) 20 – 40 seconds p Ramp-down Rate 5°C/second max Time 25°C to peak Temperature (T) 8 minutes Max. P Wave Soldering 260°C, 10 seconds max. Do not exceed 260°C Material Information Product Characteristics Body Ceramic Operating Temperature –40OC to 125OC (Consider re- rating) Leads Tin-Plated Copper Withstands 5 cycles of – 55OC to Thermal Shock 125OC Endcaps Silver-Plated Brass Vibration Per MIL-STD-202 Method 201 Insulation Resistance Greater than 10,000 ohms. (After Opening) © 2018 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 05/31/18

Special Application Fuses 242 Series Barrier Fuse Dimensions Part Numbering System 1.90mm 0242.050UAT1 4.60mm (.075") (.181") SERIES 3.02mm AMP CODE (.119") .635mm Refer to Amp Code column in the 8.40mm (.025") Electrical Specifications table. (.331") QUANTITY & PACKAGING CODE HAT1 = 100 pcs, Axial Leaded, Ammo Pack T1 Tape 1.90mm UAT1 = 500 pcs, Axial Leaded, Ammo Pack T1 Tape 4.60mm (.075") UR = 500 pcs, Surface Mount, Tape & Reel (.181") 3.02mm (.119") 8.40mm (.331") 9.80mm 2.90mm 3.20mm 4.00mm 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. © 2018 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 05/31/18