News DetailsNews Details
November 16, 2017 /  Category: Passive components, Beck Handel

Increased Power Ratings for Wide Terminal Chip Resistors from KOA

 

resistor-wide-terminal-koa

The power rating for several wide terminal chip resistor series has been increased - as a result of rigorous temperature testing, development and evaluation.

KOA’s wide terminations SMD resistors now allow the designer to use a higher power rating for chip sizes 0612, 1020 and 1225.

The 90° rotated design offers several advantages compared to standard resistor footprints, such as:
 

  • Higher reliability in power applications
  • Improved terminal strength
  • Lower expansion stress
  • Lower temperature rise
  • PCB space saving

Features:

  • Higher power than conventional style types
  • Excellent heat dissipation characteristics
  • Superior temperature and power cycling performance
  • WU73: current sensing with improved T.C.R.
  • WK73S: current sensing range from 10 mΩ ~ 9.76 Ω
  • WK73R: regular R-range from 10 Ω ~ 1 MΩ
  • WK73-RT: Anti-Sulphuration types with increased power ratings are also available
  • AEC-Q200 qualified

Applications:

  • Automotive, including ‘under the hood’ applications such as ECUs
  • Power supplies
  • DC-DC converters
  • Motor controls
  • Industrial power controls
  • Battery packs
  • Consumer electronics
Ratings
TypeSize
(inch)
Power
Rating
Rated
Terminal
Part Temp.
T.C.R
(ppm/K)
Resistance Range (Ω)
D: ±0.5%
(E24, E96)
F: ±1%
(E24, E96)
J: ±5%
(E24)
WU73 2B1506121.5 W+95 °C±100-10 m - 12 m-
±75-13 m - 27 m-
±100-30 m - 100 m-
WK73S 2B1506121.5 W+95 °C±800--10 m - 27 m
±200-30 m - 422 m30 m - 390 m
±100430 m - 9.76430 m - 9.76430 m - 9.1
WK73R 2B1506121.5 W+95 °C±10010 - 9.76 k10 - 9.76 k10 - 9.1 k
WK73S 2H210202.0 W+95 °C±800--10 m -24 m
±200-27 m -215 m27 m - 200 m
±100-220 m - 9.76220 m - 9.1
WK73R 2H210202.0 W+95 °C±100-10 - 430 k10 - 430 k
±200-432 k - 1 M470 k - 1 M
WK73S 3A312253.0 W+95 °C±800--10 m - 20 m
±300-22 m - 32.4 m22 m - 30 m
±200-33 m - 357 m33 m - 330 m
±100-360 m - 9.76360 m - 9.1
WK73R 3A312253.0 W+95 °C±100-10 - 330 k10 - 330 k
±200-332 k - 1 M360 k - 1 M

In case of using the parts at max. power rating, make sure that the max. terminal part temp. is not exceeded and follow the derating curve for these resistors.
The temperature of the product will increase depending on external elements heating the PCB. If this is the case please check the resistor terminal temperature.