Power / DC-DC

LT8640S

Analog Devices 3.4-42V 6A Silent Switcher 2 buck · LQFN-24 4x4x0.94 · 4.00 × 4.00 · 24 pins · irregular pads

Irregular pads. Build this part from the land pattern in the datasheet, not as a normal QFN with a center pad. PnP Toolkit marks it in red everywhere it appears.

Open LT8640S in PnP Toolkit Datasheet source

Package drawing

• Irregular pads (HotRod / flip-chip / module): program from the datasheet land pattern, not the QFN decoder

Top view, to scale, drawn by the same engine the app uses. Letters match the datasheet. In the app you can flip to the bottom view, which is how most datasheets draw it.

Numbers to program

Body D	4 mm
Body E	4 mm
Height (A)	0.94 mm
Leads / pins / balls	24

Silent Switcher LQFN: laminate body with several separate ground pads underneath, not one center pad. Build from the datasheet drawing.

Values come from the linked datasheet. Always confirm against the datasheet for the exact part number and suffix you are placing, and check the first board.

What to watch on Power / DC-DC

A HotRod part programmed as a plain QFN with a center pad
Suffix mix-ups: R vs T reels of the same part
Bags left open past floor life

Read the full guide: Power and DC-DC converter parts.

Program it on your machine

PnP Toolkit sets its words and setup sheet for your machine. Pick yours for the step-by-step:

Tools that use this part

FeatureParts libraryA built-in library of 179 packages and real part numbers, each with body and lead sizes, tape, MSL level and, for 104…FeatureQFN decoderType the numbers from the package drawing exactly as printed, like “0.18 0.25 0.30”. The decoder picks the nominal,…FeatureLoad checkScan or type each reel before it goes in a feeder. The answer is instant: on this job with its slot, close but not the…

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