33,226 of Walsin’s 234,815 chip resistor part numbers sit under a datasheet we hold. For a United States defence BOM, here is exactly what we can document.
Of 60 filter bands, 27 balun bands and 5 coupler bands in Walsin’s RF export, exactly one — 2400-2500 MHz — appears in all three. Measured.
Walsin offers only Y2 at X1-440Vac and only Y1 at X1-400Vac. 367 safety parts measured, plus the SMD series that carries no AC rating at all.
Walsin’s AEC-Q200 MLCC range stops at 10 nF in 0201. Measured part counts, the 0201 ceiling and four data defects in the automotive export.
Walsin’s precision thick film line offers 0.25 percent tolerance in four case sizes only, and none at 1210, 2010 or 2512. What that costs a cross.
Walsin’s thick film current sense line stops at 5 milliohm. All 58 part numbers at 1 milliohm or below are metal foil. A BMS selection checklist.
Only 20 of Walsin’s 379 MOV part numbers clear both 510 Vac and 40,000 A. Real MOV, high-voltage MLCC and divider resistor numbers for a string inverter.
Walsin publishes 17 RF coupler part numbers, not 34. At 2.4 GHz the choice is 14.6 dB coupling at 0.32 dB loss, or 6.5 dB at 1.83 dB.
21 of Walsin’s 47 inductor series hold under 20 part numbers each, 240 of 5,410. Four of them publish identical data: 72 parts, one differing cell.
Walsin’s low profile TT MLCC saves 0.20 to 1.65 mm of height. But thickness has no field in the ordering key, and 344 MLCC codes list two.
