Surface Mount Fuses NANO2® > 250V > Slo-Blo® Fuse > 443 Series 443 Series Fuse RoHS PES Description The 250V Nano2® Fuse is a small square surface mount fuse that is designed to enable compliance with the RoHS directive. This product is fully compatible with lead-free solder alloy and higher temperature profiles associated with lead-free assembly. Features • 250 VAC voltage rating • Recognized to UL/CSA/ NMX 248-1 and UL/CSA/ • Slo-Blo® Fuse NMX 248-14 • Available 0.50A – 5.00A • Conforms to K60127-1 • Halogen-free and RoHS and K60127-7 Compliant • Conforms to DENAN’s Agency Approvals • Fully compatible with Appendix 3 lead-free solder alloys • Conforms to IEC/EN Agency Agency File Number Ampere Range and higher temperature 60127-1 and IEC/EN profiles associated with E10480 0.500A - 5.00A lead-free assembly 60127-7 SU05024 -14004 0.500A - 0.750A Applications SU05024 -14003 1.00A - 2.50A SU05024 -14002 3.00A - 5.00A • AC/DC power adaptor • Lighting System PS NBK290416-JP1021 1.00A – 5.00A E • Telecom equipment • LED Lighting system power R50310551 0.500A - 5.00A • Portable system built-in AC/DC converter Electrical Characteristics for Series Additional Information % of Ampere Rating Opening Time 100% 4 hours, Minimum 250% 120 seconds, Maximum Datasheet Resources Samples Electrical Specifications by Item Ampere Max Nominal Cold Nominal Nominal Agency Approvals Interrupting Rating Amp Code Voltage Rating Resistance Melting Voltage Drop (A) (V) Rating4 (Ohms) I2t (A2sec) (mV) PES 0.50 .500 250 0.600 1.61 448 x x - x 0.75 .750 250 0.275 3.025 285 x x - x 1 001. 250 0.180 10.17 234 x x x x 1.50 01.5 250 0.100 14.72 196 x x x x 2 002. 250 50A @ 250VAC 0.052 18.06 154 x x x x 2.50 02.5 250 100A @ 125VDC 0.035 18.13 139 x x x x 3 003. 250 0.028 51.44 113 x x x x 3.50 03.5 250 0.019 53.14 98 x x x x 4 004. 250 0.016 122.5 81 x x x x 5 005. 250 0.0115 180.6 80 x x x x Notes: 1. Cold resistance measured at less than 10% of rated current at 23°C. 2. Agency Approval Table Key: X=Approved or Certified, P=Pending and Blank=Not Approved 3. Have special electrical characteristic needs? Contact Littelfuse to learn more about application specific options. 4. Interrupting Rating may differ based on Agency Approval. See Agency Approval certificate for more details. © 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD.11/05/20

Surface Mount Fuses NANO2® > 250V > Slo-Blo® Fuse > 443 Series Temperature Re-rating Curve Average Time Current Curves AAAAAAAAAA 0.50 0.75 1.00 1.50 2.00 2.50 3.00 3.50 4.00 5.00 100 10 1 Seconds me in Ti 0.1 Note: 1. Rerating depicted in this curve is in addition to the standard derating of 25% for continuous operation. 0.01 0.001 0.1 1 10 100 1000 Current in Amps Soldering Parameters Reflow Condition Pb – Free assembly - Temperature Min (T ) 150°C tP s(min) T Pre Heat -- TTeimmep e(Mraitnu rteo MMaaxx )( T(ts(m)ax)) 2600 0–° C180 secs P Ramp-up CriTtiLc taol ZToPne s ATSv(mearxa) gtoe TraL m- Rpa umpp r-autpe R(Laitqeuidus Temp (TL) to peak 55°°CC//sseeccoonndd mmaaxx.. eruTS(mTaxL) tL Reflow - Temperature (TL) (Liquidus) 217°C tar Ramp-down - Temperature (t) 60 – 150 seconds e L p Preheat PTeimake T wemithpienr a5t°uCr eo f( TaPc)tual peak Temperature (t) 22600 –+ 04/–05 °sCeconds meTTS(min) tS p Ramp-down Rate 5°C/second max. Time 25°C to peak Temperature (T) 8 minutes max. 25 P Do not exceed 260°C time to peak temperature Time (t 25ºC to peak) Wave Soldering Parameters 260°C Peak Temperature, 3 seconds max. © 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD.11/05/20

Surface Mount Fuses NANO2® > 250V > Slo-Blo® Fuse > 443 Series Product Characteristics Body: Ceramic Operating Temperature –55OC to 125OC Materials Cap: Silver Plated Brass MIL-STD-202, Method 107, Thermal Shock Test Condition B (5 cycles -65oC Body: Brand Logo, Current Rating to +125oC) Product Marking Rated Voltage, and MIL-STD-202, Method 201 Vibration T - Characteristic “T” (10-55 Hz) MIL-STD-202, Method 106, Moisture Resistance Insulation Resistance MIL-STD-202, Method 302, High Humidity (90-98%RH), Heat (65oC) (after Opening) Test Condition A (10,000 ohms, Minimum) MIL-STD-202, Method 101, Salt Spray Test Condition B Solderability MIL-STD-202, Method 208 MIL-STD-202, Method 213, Mechanical Shock Test Condition I (100 G’s peak for Resistance to Soldering MIL-STD-202, Method 210, 6 milliseconds) Heat Test Condition B (10 sec at 260oC) Moisture Sensitivity Level 1 J-STD-020 Level Min. copper layer thickness = 100um Min. copper trace width = 10mm PCB Recommendation Alternate methods of thermal management for Thermal may be used. In such cases, under normal Management operations, the maximum temperature of the fuse body should not exceed 80OC in a 25OC ambient environment. Dimensions Part Numbering System 3.25 10.08 (.128") 0443 .500 D R (.397") 6.10 Series 5A T 3.05 (.240") 3.43 AC250V (.12") (.135") AMP Code 12.6 Refer to Electrical charac- 3.05 (.496") teristics table (.12") 1.70 typ Quantity Code Recommended Pad Layout (.067") D = 1500 pcs Packaging Code R = Tape and Reel Example: 1.5 amp product is 0443 01.5 D R (0.5 amp product shown above). Packaging Quantity & Packaging Option Packaging Specification Quantity Packaging Code 24mm Tape and Reel EIA-RS 481-2 (IEC 286, part 3) 1500 DR Disclaimer Notice - Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. 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. © 2020 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD.11/05/20