WS74285M-8
Public Unreviewedby Ray
WILLSEMI Will Semicon Current-Sensing Amplifiers, MSOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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README
markdownWS74285M-8
WILLSEMI Will Semicon · Current-Sensing Amplifiers · MSOP-8
WS74285M-8 from WILLSEMI Will Semicon, in a MSOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | RS1+ | input | Channel 1 external sense-resistor power-side (high-side) connection. Common-mode range 2.7 V to 76 V; input bias current ~45 uA (typ, 70 uA max). Differential voltage vs RS1- is amplified by the fixed gain to OUT1. |
| 2 | RS1- | input | Channel 1 external sense-resistor load-side connection. Forms the differential sense input together with RS1+. Absolute voltage between RS+ and RS- limited to +/-10 V. |
| 3 | RS2+ | input | Channel 2 external sense-resistor power-side (high-side) connection. Common-mode range 2.7 V to 76 V; input bias current ~45 uA typ. |
| 4 | RS2- | input | Channel 2 external sense-resistor load-side connection. Forms the differential sense input together with RS2+. |
| 5 | GND | power_in | Device ground reference for the supply and the output stages. All voltages (except differential RS sense voltages) are referenced to this pin. |
| 6 | OUT2 | output | Channel 2 analog output. Delivers G x (VRS2+ - VRS2-) referenced to GND. Full-scale VSENSE = 125 mV (variant-dependent: 200 mV @ G=12.5, 125 mV @ G=20, 50 mV @ G=50, 25 mV @ G=100). Output is high-Z during power-up. |
| 7 | OUT1 | output | Channel 1 analog output. Delivers G x (VRS1+ - VRS1-) referenced to GND. VOH ~ VDD - 7 mV sourcing 500 uA; VOL ~ 8 mV sinking 500 uA. |
| 8 | VDD | power_in | Supply voltage input, 2.7 V to 5.5 V (absolute maximum 6 V). Quiescent current 200 uA typ (680 uA max) at TA = +25 C. PSRR 130 dB typ. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | WILLSEMI Will Semicon |
| Package | MSOP-8 |
| Category | Op-amp/Cmp |
| Pins | 8 |
Ordering variants
Same part, different packaging or reel option.
WS74285M-8/TRWS74285M-8C-8/TR
CAD (KiCad official)
- Symbol:
WS74285M-8 - Footprint:
Package_SO:MSOP-8_3x3mm_P0.65mm - 3D model: MSOP-8 (KiCad packages3D, STEP)
3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
ws74285m-8.step |
123 KB | You want the bare part, or you mark your own boards. |
ws74285m-8-etched.step |
2.2 MB | You want the part with WS74285M-8 already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 538 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: WILLSEMI Will Semicon datasheet (14 pp, sha256
c04b7387c9ff2d9f, retrieved 2026-08-17, tier: lcsc) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).