WW25 WALSIN | Alldatasheet

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Technical content

WW25,WW20,WW12,WW08,WW06,WW04 1%, 0.5% Low Ohmic Thin Film Current Sensor Resistors Size 2512, 2010, 1206, 0805, 0603, 0402

FEATURES

  1. SMD metal film resistor 2. High reliability and stability 3. High performance of TCR 4. Low current noise

APPLICATIONS

DESCRIPTION

The resistors are constructed in a high grade ceramic body (aluminum oxide). Internal metal electrodes (Cu) are plated at each end and connected by a resistive layer that is applied to the bottom surface of the substrate. The composition of the resistive layer 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 environmental soldering issue, the outer layer of these end terminations is a Lead-free solder .

Note : 1. This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication 60115-8” 2. Max. Operation Voltage : So called RCWV (Rated Continuous Working Voltage) is determined by ValueResistancePowerRatedRCWV 3. Operating Temperature Range : -55 oC to +125oC Series No. Size Code Power Rating and TCR Resistance Range Resistance ToleranceF G H WW04 0402 (1005) 1/10W 101m ~ 900m ±0.5% 75 ppm/C 1/10W 21m ~ 900m 100 ppm/C WW06 0603 (1608) 1/8W 101m ~ 900m 75 ppm/C 1/8W 21m ~ 900m 100 ppm/C WW08 0805 (2012) 1/4W 101m ~ 900m 75 ppm/C 1/4W 21m ~ 900m 100 ppm/C WW12 1206 (3216) 1/2W 1W 101m ~ 900m 75 ppm/C 75 ppm/C 1/2W 21m ~ 900m 100 ppm/C WW20 2010 (5025) 101m ~ 900m 75 ppm/C 21m ~ 900m 100 ppm/C WW25 2512 (6342) 101m ~ 900m 75 ppm/C 21m ~ 900m 100 ppm/C

DIMENSIONS:(unit:mm) Type WW25 WW20 WW12 WW08 WW06 WW04 Marking 0402(No Marking) 0603/0805(3 digits) 020=20mR,270=270mR 1206/2010/2512(4 digits) R020=20mR,R270=270mR Protective coat Resistive layer End termination Ceramic Substrate t B A L

Standard values of nominal resistance are taken from the E96 & E24 series for resistors with a tolerance of 0.5%,1.0%. The values of the E24/E96 series are in accordance with “IEC publication 60063”. DERATING The power that the resistor can dissipate depends on the operating temperature; see Fig.1 0402 to 2512 Range: -55°C to +125°C (Fig.1)

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. discrete components on the reverse (mixed PCBs). Surface Mount Resistors are tested for solderability at 235 C during 2 seconds within lead-free solder bath. condition that provide reliable joints without any damage are given in Fig 3. and Table 1. Table 1. Infrared soldering condition for Chip Resistors

WW25: 2512 WW20: 2010 WW12: 1206 WW08: 0805 WW06: 0603 WW04: 0402 TCR & Power F: 75 ppm G:100 ppm H: 75 ppm High Power Resistance R followed by 3 significant digits e.g. : R100 = 100mΩ R050 = 50mΩ Tolerance D : ±0.5% F : ±1% Packaging code T: 7” Taped & Reeled G: 13” Taped & Reeled Termination code L : Sn base (lead free)

TEST AND REQUIREMENTS(JIS C 5201-1 : 1998) TEST PROCEDURE REQUIREMENT Resistor DC resistance Clause 4.5 DC resistance values measured <10@0.1V, Within the specified tolerance Temperature Coefficient of Resistance(T.C.R) Clause 4.8 Natural resistance change per change in degree centigrade. 1 2 1 1 2 10 t t R R R (ppm/C ) R1 : Resistance at reference temperature R2 : Resistance at test temperature t1 : 20°C+5°C-1°C t2 : 125°C+5°C-1°C Refer to “ QUICK REFERENCE DATA “ Short time overload (S.T.O.L) Clause 4.13 5 times of rated power for 5 seconds at room temperature Resistance to soldering heat(R.S.H) IEC 60068-2- 58:2004 Un-mounted chips completely immersed for 10±1second in a SAC solder bath at 260 ±5ºC no visible damage Solderability IEC 60068-2- 58:2004 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 Temperature cycling Clause 4.19 30 minutes at -55 C3C, 2~3 minutes at 20°C+5°C-1°C, 30 minutes at +155 C3C, 2~3 minutes at 20°C+5°C-1°C, total 5 continuous cycles no visible damage Load life (endurance) Clause 4.25 70±2ºC, 1000 hours, loaded with RCWV or Vmax,1.5 hours on and 0.5 hours off Load life in Humidity Clause 4.24 1000 hours, at rated continuous working voltage in humidity chamber controller at 40 C2C and 90~95% relative humidity, 1.5hours on and 0.5 hours off Bending strength Clause 4.33 Resistors mounted on a 90mm glass epoxy resin PCB(FR4); bending : 3 mm, once for 10 seconds. Adhesion Clause 4.32 Pressurizing force: 5N, Test time: 10 1sec. No remarkable damage or removal of the terminations.

Paper Tape specifications (unit :mm) Series No. A B W F E Series No. P1 P0 D T 0 . 050 . 1 Max 1.2 0 . 050 . 1 Max 1.2 0 . 050 . 1 Max. 1.0 0 . 050 . 1 Max. 1.0 0 . 050 . 1 0.65±0.05 0 . 050 . 1 0.40±0.05

  • Chip resistors 4,000 pcs per reel ( WW25, WW20 ) - Chip resistors 5,000 pcs per reel ( WW12, WW08, WW06 ) - Chip resistors 10,000 pcs per reel ( WW04 ) ABC D