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Molex 2039550403 — Mezzanine & Stacking Connectors

Molex SlimStack FSB5 2039550403, 0.40mm Pitch

MPN2039550403
Active

Molex SlimStack FSB5 2039550403, 40-position receptacle, 0.016" (0.40mm) pitch, dual-row, SMT, gold contacts, 2.90mm board height, 5mm mated stack height, solder retention.

$2.6000Ref. price · indicative, final on quote
Molex 2039550403 datasheet (PDF)
RoHSROHS3 Compliant
SeriesSlimStack FSB5 203955
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

2039550403 specifications
ParameterValue
SeriesSlimStack FSB5 203955
MountingSurface Mount
Connector typeReceptacle, Outer Shroud Contacts
Height above board0.114\" (2.90mm)
Mated stacking heights5mm
Pitch0.016\" (0.40mm)
PackageTape & Reel (TR) Cut Tape (CT)
FeaturesSolder Retention
Contact finishGold
Rows2
Positions40

Product details

Board-Stacking Fit for Tight Z-Height Budgets

The Molex 2039550403 is a 40-position receptacle from the SlimStack FSB5 203955 series, designed for board-to-board mezzanine stacking where the gap between parallel PCBs is fixed at 5 mm. The 0.016" (0.40 mm) pitch on a dual-row layout packs 40 signal circuits into a compact footprint — the tight pitch means routing traces between pads requires careful clearance planning, but the density saves real estate on both boards.

Stack Height and the Gap It Lives In

The mated stack height is 5 mm, with the receptacle itself sitting 0.114" (2.90 mm) above the board.

Frequently asked questions

What is the mating connector for 2039550403?

The 2039550403 is a receptacle with outer shroud contacts; it mates with the corresponding SlimStack FSB5 203955 series header (same pitch and stack height) to form a 5 mm mated pair. The exact header order code depends on the position count and orientation needed — confirm the header part number against the same series for a guaranteed fit.

What is the stacking height of 2039550403?

The mated stacking height is 5 mm, with the receptacle standing 0.114" (2.90 mm) above the board surface. This defines the gap between the two parallel PCBs when mated with the matching SlimStack FSB5 header.