WF06A WALSIN | Alldatasheet
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Page 1 of 7 ASC_WF06A_V01 NOV - 201 5 WF06A 1 ~ 1Mohm High Power Chip Resistors Size 0603 1/4W *Contents in this sheet are subject to change without prior notice.
Page 2 of 7 ASC_WF06A_V01 NOV - 201 5 FEATURE 1. Small size and light weight 2. High reliability and stability 3. Reduced size of final equipment 4. High power 5. RoHS compliant and Lead free products APPLICATION /circle6 High accuracy dc-power supply /circle6 Digital multi-meter /circle6 Telecommunication /circle6 Computer /circle6 Automotive industry /circle6 Medical and military equipment
DESCRIPTION
The resistors are constructed in a high grade ceramic body (aluminum oxide). Internal metal electrodes are added at each end and connected by a resistive paste that is applied to the top surface of the substrate. The composition of the paste is adjusted to give the approximate resistance required and the value is trimmed to nominated value within tolerance which controlled by laser trimming of this resistive layer. The resistive layer is covered with a protective coat. Finally, the two external end terminations are added. For ease of soldering the outer layer of these end terminations is a Tin (lead free) alloy. Fig 1. Construction of Chip-R
Page 3 of 7 ASC_WF06A_V01 NOV - 201 5 QUICK REFERENCE DATA Item General Specification Series No. WF06A Size code 0603(1608) Resistance Tolerance ±5%, ±1% Resistance Range 1 ~ 1M Ω (E96+E24 series) TCR (ppm/ °C) 51 ~ 1Mohm: ≤ ± 100 ppm/ °C 1 ~ 49.9ohm: +500 ~ -200 ppm/ °C Max. dissipation at T amb =70 °C 1/4W Max. Operation Voltage) 150V Max. Overload Voltage 300V Climatic category (IEC 60068) 55/155/56 DIMENSIONS(unit : mm) Part No WF06A L 1.60 ± 0.10 T 0.45 ± 0.15 Tb 0.30 ± 0.10 Tt 0.30 ± 0.20 MARKING Each resistor is marked with a three-digit (E24) on the protective coating to designate the nominal resistance value. No marking in the E96 series! 510
Page 4 of 7 ASC_WF06A_V01 NOV - 201 5 FUNCTIONAL DESCRIPTION Product characterization Standard values of nominal resistance are taken from the E96&E24 series for resistors with a tolerance of ±1%, ±5%. The values of the E96/E24 series are in accordance with “IEC publication 60063”. Derating The power that the resistor can dissipate depends on the operating temperature; see Fig.2 MOUNTING Due to their rectangular shapes and small tolerances, Surface Mountable Resistors are suitable for handling by automatic placement systems. Chip placement can be on ceramic substrates and printed-circuit boards (PCBs). Electrical connection to the circuit is by individual soldering condition. The end terminations guarantee a reliable contact. SOLDERING CONDITION The robust construction of chip resistors allows them to be completely immersed in a solder bath of 260 °C for 10 seconds. Therefore, it is possible to mount Surface Mount Resistors on one side of a PCB and other discrete components on the reverse (mixed PCBs). Surface Mount Resistors are tested for solderability at 235°C during 2 seconds. The test condition for no leaching is 260 °C for 30 seconds. Typical examples of soldering processes that provide reliable joints without any damage are given in Fig 3. Fig 3. Infrared soldering profile for Chip Resistors
Page 5 of 7 ASC_WF06A_V01 NOV - 201 5 CATALOGUE NUMBERS The resistors have a catalogue number starting with . WF06 A 510_ F T L Size code WF06: 0603 Type code A :Power 0603 size= 1/4W Resistance code 5% E24: 2 significant digits followed by No. of zeros e.g.: 3ohm =3R0 10ohm =100 56Kohm =563 1% E24+E96: 3 significant digits followed by No. of zeros 100Ω =1000 37.4K Ω =3742 Tolerance J : ±5% F : ±1% Packaging code T : 7” Reeled taping paper taping 5Kpcs/reel. Termination code L = Sn base (lead free) /square6 Reeled tape packaging : 8mm width paper taping 5000pcs per 7” reel.
Page 6 of 7 ASC_WF06A_V01 NOV - 201 5 TEST AND REQUIREMENTS Basic specification : JIS C 5201-1 : 1998 TEST PROCEDURE REQUIREMENT Clause 4.8 Temperature Coefficient of Resistance (TCR ) Natural resistance change per change in degree centigrade. ( ) 12 1 12 10 ×− ttR RR (ppm/ °C) R 1 : Resistance at reference temperature R 2 : Resistance at test temperature t1 : 20 ℃+5 ℃-1℃. Refer to quick reference data for T.C.R specification Clause 4.13 Short time overload 2.5 × Rated voltage or Max. Overload Voltage for 2 sec. Measure resistance after 30 minutes. ΔR/R max.:≦ ±(1%+0.05 Ω ) Clause 4.18 Resistance to soldering heat(R.S.H) Un-mounted chips completely immersed for 10 ±1second in a SAC solder bath at 260 ℃±5ºC. No visible damage ΔR/R max. :≦ ±(1%+0.05 Ω ) Clause 4.17 Solderability Un-mounted chips completely immersed for 2±0.5 second in a SAC solder bath at 235℃±5 ℃. Good tinning (>95% covered) No visible damage Clause 4.19 Temperature cycling 1. 30 minutes at -55 °C ±3°C, 2. 2~3 minutes at 20° C+5° C-1° C, 3. 30 minutes at +155 °±3°C, 4. 2~3 minutes at 20° C+5° C-1° C, Total 5 continuous cycles. No visible damage ΔR/R max. ≦ ±(1% +0.05 Ω ) Clause 4.25 Load life (endurance) 1000 +48/-0 hours, loaded with RCWV or Vmax in chamber controller 70 ±2ºC, 1.5 hours on and 0.5 hours off. No visible damage ΔR/R max. ≦ ±(5%+0.1 Ω ) Clause 4.24 Load life in Humidity 1000 +48/-0 hours, loaded with RCWV or Vmax in humidity chamber controller at 40 °C ±2°C and 90~95% relative humidity, continuous on. No visible damage ΔR/R max. ≦ ±(5%+0.1 Ω ) Clause 4.33 Bending strength Resistors mounted on a 90mm glass epoxy resin PCB(FR4); bending : 3 mm, once for 10 seconds. No visible damage ΔR/R max. ≦ ±(1% +0.05 Ω ) Clause 4.32 Adhesion Pressurizing force: 5N, Test time: 10 ±1sec. No remarkable damage or removal of the terminations Clause 4.6 Insulation Resistance Apply the insulation voltage 150Vdc for 1minute. R ≧1G Ω Clause 4.7 Dielectric Withstand Voltage Apply 1.42 times the insulation voltage for 1 minute. No breakdown or flashover
Page 7 of 7 ASC_WF06A_V01 NOV - 201 5 PACKAGING Paper Tape specifications (unit :mm) Series No. A B W F E Series No. P1 P0 Φ D T 0 . 050 . 1+ Φ Max. 0.80 Reel dimensions Symbol A B C D