Surface Mount Fuses NANO2® > 157T Fuse and Holder Combination 157T Series – Standard Nano2® Fuse and Clip Assembly RoHS PS E Description The 157T Series Fuse/Clip assembly is a small, square, Time-Lag, surface mount fuse that is assembled in surface mountable fuse clips. The unique time delay feature of this fuse design helps solve the problem of nuisance “opening” by accommodating inrush currents that normally cause a fast acting fuse to open. The fuse clip and pre-installed fuse combination can be automatically placed in PC Board in one efficient manufacturing operation. It permits quick and easy replacement of fuses without performing desoldering process, even in the field and without exposing the PC Board to detrimental effects of rework solder heat. Agency Approvals AGENCY PS E Features AGENCY FILE NUMBER AMPERE RANGE E14721 0.375A ~ 5A NBK030205-E10480B 1A - 5A Electrical Characteristics for Series % of Ampere Rating % of Ampere Rating Opening Time at 25ºC 100% 0.375A ~ 5A 4 hours, Minimum 200% 0.375A ~ 5A 300% 0.375A ~ 5A 800% 0.375A ~ 5A 1 sec. Minimum, 60 secs. Maximum 0.20 secs. Minimum, 3.00 secs. Maximum 0.02 secs. Minimum, 0.10 secs. Maximum • Surface Mountable, Time-Lag Fuse. • Easily replaceable on PC Board (Field Replaceable) • Fully compatible with RoHS/Pb-Free solder alloys and higher temperature profiles associated with leadfree assembly. • RoHS Compliant and Halogen-free • Available in ratings of 0.375 ~ 5 Amperes. Applications •Instrumentations •Telecommunications • Base Stations Additional Information Datasheet Resources Samples Electrical Specifications by Item Ampere Rating (A) Amp Code Max Voltage Rating (V) 0.375 0.500 0.750 1.00 1.50 2.00 2.50 3.00 3.50 4.00 5.00 .375 .500 .750 001 01.5 002 02.5 003 03.5 004 005 125 125 125 125 125 125 125 125 125 125 125 Interrupting Rating (A) Fuse Furnished Nominal Cold Resistance (Ohms) Nominal Melting I2t (A2sec) 50A @ 125VAC/VDC 0454.375 0454.500 0454.750 0454001. 045401.5 0454002. 045402.5 0454003. 045403.5 0454004. 0454005. 1.2214 0.7047 0.3602 0.2245 0.0934 0.0629 0.0452 0.0342 0.0226 0.0188 0.0138 0.101 0.240 0.904 1.98 3.65 8.20 15.0 20.16 26.53 34.40 53.72 1. Cold resistance measured at less than 10% of rated current at 23ºC. 2.I2t values stated for 8ms opening time. 3. Agency Approval Table Key: X=Approved or Certified, P=Pending and Blank=Not Approved 4.Have special electrical characteristic needs? Contact Littelfuse to learn more about application specific options © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Application testing is strongly recommended. Revised: 05/20/15 Agency Approvals PS E X X X X X X X X X X X X X X X X X X X Surface Mount Fuses NANO2® > 157T Fuse and Holder Combination 2.0A 2.5A 3.0A 3.5A 4A 5A .75A 1.0A 1.5A 100 .50A Average Time Current Curves .375A Temperature Re-rating Curve TIME IN SECONDS 10 1 0.1 Note: 0.01 1. Rerating depicted in this curve is in addition to the standard derating of 25% for continuous operation. 0.001 0.1 1 10 100 CURRENT IN AMPS Soldering Parameters Pre Heat Pb – Free assembly - Temperature Min (Ts(min)) 150°C - Temperature Max (Ts(max)) 200°C - Time (Min to Max) (ts) 60 – 120 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 – 90 seconds Peak Temperature (TP) 250 Time within 5°C of actual peak Temperature (tp) 20 – 40 seconds +0/-5 tP TP °C Ramp-down Rate 5°C/second max Time 25°C to peak Temperature (TP) 8 minutes Max. Do not exceed 260°C Temperature Reflow Condition Critical Zone TL to TP Ramp-up TL TS(max) tL Ramp-down TS(min) Preheat tS 25 time to peak temperature (t 25ºC to peak) Time © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 05/20/15 Surface Mount Fuses NANO2® > 157T Fuse and Holder Combination Product Characteristics Body: Ceramic Cap: For 0.375A ~ 5A – Silver plated Brass Clip Plating: Matte Tin Materials Product Marking Body: Brand Logo, Current Rating, “T” for Time-Lag Clip Retention Force applied at fuse center, perpendicular to the long axis (@0.75 lbs. MIN) Solderability MIL-STD-202, Method 208 / IPC/ EIA / JEDEC J-STD-002, Test Condition A Humidity Test MIL –STD-202, Method 103 @ 85ºC / 85%RH, 1000 hours Resistance to Solvents MIL-STD-202, Method 215 (3 solvent types) Operating Temperature -55ºC to 125ºC with proper derating Thermal Shock MIL-STD-202, Method 107, Test Condition B (5 cycles -65ºC to +125ºC) Vibration MIL-STD-202, Method 201 (10-55 Hz) Moisture Resistance MIL-STD-202, Method 106, 10 cycles Salt Spray/ Atmosphere MIL-STD-202, Method 101, Test Condition B (48 hrs.), 5% NaCl in De-ionized Water Shock MIL-STD-202, Method 213, Test Condition I (100 G’s peak for 6 milliseconds) Part Numbering System Dimensions 6.50 ± 0.20 [0.256] 0157 005. D R T 6.10 [0.240] 2.69 [0.106] LF T 3.7 ± 0.13 [0.146] 1A 1.45 [0.057] SERIES TIME-LAG FUSE AMP CODE PACKING OPTION 2.69 [0.106] R = Tape and Reel 3.70 [0.146] QUANTITY CODE D = 1500 pcs 3.40 [0.134] 3.90 ± 0.13 [0.154] 2.50 ± 0.2 [0.098] "A" "B" 0.10 7.26 [0.29] 2.46 [0.10] 3.00 [0.12] 2.40 [0.09] PCB Recommendation for Thermal Management 1. Minimum Copper Layer Thickness = 100um 2. Minimum Copper Trace Width = 10mm Note: Alternate methods of thermal management may be used. In such cases, under normal operations, the maximum temperature of the fuse body should not exceed 80ºC in a 25ºC ambient environment. © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 05/20/15 Packaging Packaging Option Packaging Specification Quantity Quantity & Packaging Code Tape and Reel Surface Mount 1500 DRT