1、 Description, Features and Applications
The R2050 series square Surface Mount fuses are designed for high-end cloud computing servers, telecom base station power supplies, blockchain servers, and new energy vehicle battery management systems, RoHS compliant, Halogen Free and lead(Pb) exempts of the requirements of RoHS Directive(2002/95/EC), with U.S. (UL/CSA) safety agency approvals. Provide board level primary and secondary circuit protection in a wide variety of applications. With excellent inrush current withstanding capability, excellent reliability for thermal and mechanic shock, also have a high reliability and stable solder ability, end caps are available in gold/silver plated.
Features：
?Fast acting /Time-Lag ? Small size(20.5mm*5.06mm)
?High current rating available ? Wide operating temperature range( -55°C to 125°C)
?Low temperature de-rating ? RoHS compliant, Halogen Free
?Tape and Reel for automatic placement ? Conflict free metals
Applications：
? Telecom base station power supplies ? Cloud computing ? Block chain server ? Battery Management System
2、Standards：In accordance with UL 248-14.
3、Electrical Characteristics for Series
% of Ampere rating | OpeningTime |
100% | 4 hours, Minimum |
200% | 60 sec., Max. |
4、Electrical Specifications by Item
●DC Cold Resistance are measured at <10% of rated current in ambient temperature of 25℃;
●Typical Pre-arching I2t are calculated at 10*In Current or 8ms.
Notes:
1. Derating depicted in this curve is in addition to the standard derating of 20% for continuous operation.
Example:For continuous operation at 75 degrees celsius, the fuse should be derated as follows:I = (0.80)(0.85)IRAT= (0.68)IRAT
5、Soldering Parameters
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 – 120 secs | |
Average ramp up rate (Liquidus Temp (TL) to peak | 3°C/second max. |
TS(max) to TL - Ramp-up Rate | 3°C/second max. |
Reflow | - Temperature (TL) (Liquidus) 217°C |
- Temperature (tL) 60 – 90 seconds | |
Peak Temperature (TP) | 260+0/–5 °C |
Time within 5°C of actual peak Temperature (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 |
Wave Soldering Parameters | 260°C Peak Temperature,3 seconds max. |
6、Dimensions and Structure
7、Product Characteristics
編號 NO. | 項目 Item | 內容 Content | 參考標準 Reference standards |
1 | 產品標識 Product Marking |
Brand, Ampere Rating |
marking standards |
2 | 工作溫度 Operating Temperature |
-55°C to 125°C | –55oC to 125oC with proper derating |
3 | 可焊性 Solderability | T=240°C±5°C , t=3sec±0.5sec, Coverage≥95% |
MIL-STD-202, Method 208 |
4 | 耐焊接熱 Resistance to Soldering Heat |
10 sec at 260°C | MIL-STD-202, Method 210, Test condition B |
5 | 絕緣阻抗 Insulation Resistance (after Opening) |
10,000 ohms minimum
5 cycles, -65°C / +125°C, 15 minutes at each extreme |
MIL-STD-202, Method 302, Test Condition A |
6 | 熱沖擊 Thermal Shock | MIL-STD-202, Method 107, Test Condition B | |
7 | 機械沖擊 Mechanical Shock | 100G’s peak for 6 milliseconds, 3cycles | MIL-STD-202, Method 213, Test I |
8 | 振動試驗 Vibration | 0.03”amplitude, 10-55 Hz in 1 min. 2hrs each XYZ=6hrs |
MIL-STD-202, Method 201 |
9 | 耐濕性 Moisture Resistance |
10 cycles |
MIL-STD-202, Method 106 |
10 | 鹽霧試驗 Salt Spray |
5% salt solution, 48hrs | MIL-STD-202, Method 101, Test Condition B |
8、Packaging
2,000 pcs in 13 inches dia. reel, 24mm wide tape, EIA Standard 481
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