Board to Board & Mezzanine Connectors

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FSB SlimStack Board-to-Board Connectors

Molex FSB SlimStack Board-to-Board Connectors feature an extensive floating range for space-saving and design flexibility. The connectors feature a ±0.50mm floating range in X-, Y-, and Z-axis directions to facilitate assembly in the event of misalignment or blind joining. The compact connectors have a 0.40mm pitch, a height of only 5mm, and a width of 3.80mm. The series supports high-speed transmission rates up to 6Gbps. FSB connectors are ideal for various automotive, industrial, and consumer applications.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (IDR) Filter the results in the table by unit price based on your quantity.	Qty.	Product	Number of Positions	Pitch	Number of Rows	Termination Style	Mounting Angle	Stack Height	Current Rating	Voltage Rating	Minimum Operating Temperature	Maximum Operating Temperature	Contact Plating	Contact Material	Housing Material	Series	Packaging
Board to Board & Mezzanine Connectors .40mm SlimStack Floating Plug 20Ckt 204928-0201 Molex 1: Rp62.927 8.812In Stock	Mfr. Part No. 204928-0201 Mouser Part No 538-204928-0201	Molex	Board to Board & Mezzanine Connectors .40mm SlimStack Floating Plug 20Ckt Learn More about Molex fsb5 b2b connectors	Datasheet	8.812In Stock	Cut Tape Rp62.927 Rp53.570 Rp47.883 Rp45.498 Reel Rp37.426 View Rp42.746 Rp40.728 Rp39.994 Rp34.857	Min.: 1 Mult.: 1 : 3.000	Headers	20 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	3 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	204928	Reel, Cut Tape
Board to Board & Mezzanine Connectors .40mm SlimStack Rec Floating 20Ckt 204927-0201 Molex 1: Rp55.405 9.877In Stock	Mfr. Part No. 204927-0201 Mouser Part No 538-204927-0201	Molex	Board to Board & Mezzanine Connectors .40mm SlimStack Rec Floating 20Ckt Learn More about Molex fsb5 b2b connectors	Datasheet	9.877In Stock	Cut Tape Rp55.405 Rp47.149 Rp42.196 Rp40.178 Reel Rp31.372 View Rp37.609 Rp35.775 Rp34.674 Rp29.904	Min.: 1 Mult.: 1 : 3.000	Receptacles	20 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	3 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	204927	Reel, Cut Tape
Board to Board & Mezzanine Connectors 0.4 FLOATING BB Rec PKG 30ckt 204927-0301 Molex 1: Rp65.862 12.196In Stock	Mfr. Part No. 204927-0301 Mouser Part No 538-204927-0301	Molex	Board to Board & Mezzanine Connectors 0.4 FLOATING BB Rec PKG 30ckt Learn More about Molex fsb5 b2b connectors	Datasheet	12.196In Stock	Cut Tape Rp65.862 Rp55.955 Rp49.901 Rp47.516 Reel Rp37.242 View Rp44.581 Rp42.563 Rp42.012 Rp36.509 MouseReel Available	Min.: 1 Mult.: 1 : 3.000	Receptacles	30 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	3 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	204928	Reel, Cut Tape, MouseReel
Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM RECEPT 20CKT 203955-0203 Molex 1: Rp37.793 3.353In Stock 12.690Expected 16/10/2026	Mfr. Part No. 203955-0203 Mouser Part No 538-203955-0203	Molex	Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM RECEPT 20CKT Learn More about Molex fsb5 b2b connectors	Datasheet	3.353In Stock 12.690Expected 16/10/2026	Cut Tape Rp37.793 Rp33.023 Rp29.904 Rp28.620 Reel Rp22.749 View Rp26.785 Rp25.317 Rp24.767 Rp21.098 MouseReel Available	Min.: 1 Mult.: 1 : 3.300	Receptacles	20 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	5 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	203955	Reel, Cut Tape, MouseReel
Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM RECEPT 30CKT 203955-0303 Molex 1: Rp43.297 8.291In Stock	Mfr. Part No. 203955-0303 Mouser Part No 538-203955-0303	Molex	Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM RECEPT 30CKT Learn More about Molex fsb5 b2b connectors	Datasheet	8.291In Stock	Cut Tape Rp43.297 Rp36.875 Rp33.023 Rp31.372 Reel Rp24.584 View Rp29.354 Rp28.069 Rp26.602 Rp23.299	Min.: 1 Mult.: 1 : 3.300	Receptacles	30 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	5 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	203955	Reel, Cut Tape
Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM PLUG 20CKT 203956-0203 Molex 1: Rp45.131 5.183In Stock	Mfr. Part No. 203956-0203 Mouser Part No 538-203956-0203	Molex	Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM PLUG 20CKT Learn More about Molex fsb5 b2b connectors	Datasheet	5.183In Stock	Cut Tape Rp45.131 Rp39.627 Rp35.408 Rp33.757 Reel Rp24.951 View Rp31.555 Rp30.087 Rp25.134 Rp24.400 MouseReel Available	Min.: 1 Mult.: 1 : 2.200	Headers	20 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	5 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	203956	Reel, Cut Tape, MouseReel
Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM PLUG 50CKT 203956-0503 Molex 1: Rp61.276 4.359In Stock	Mfr. Part No. 203956-0503 Mouser Part No 538-203956-0503	Molex	Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM PLUG 50CKT Learn More about Molex fsb5 b2b connectors	Datasheet	4.359In Stock	Cut Tape Rp61.276 Rp52.103 Rp46.599 Rp44.397 View Reel Rp33.757 Rp41.645 Rp39.627 Rp35.224 Rp33.757	Min.: 1 Mult.: 1 : 2.200	Headers	50 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	5 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	203956	Reel, Cut Tape
Board to Board & Mezzanine Connectors .40mm SlimStack Floating Plug 50Ckt 204928-0501 Molex 1: Rp86.960 3.964In Stock	Mfr. Part No. 204928-0501 Mouser Part No 538-204928-0501	Molex	Board to Board & Mezzanine Connectors .40mm SlimStack Floating Plug 50Ckt Learn More about Molex fsb5 b2b connectors	Datasheet	3.964In Stock	Cut Tape Rp86.960 Rp73.934 Rp69.348 Rp66.046 View Reel Rp50.635 Rp62.927 Rp58.891 Rp57.790 Rp54.488 Rp50.635	Min.: 1 Mult.: 1 : 3.000	Headers	50 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	3 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	204928	Reel, Cut Tape
Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM RECEPT 40CKT 203955-0403 Molex 1: Rp45.865 1.533In Stock	Mfr. Part No. 203955-0403 Mouser Part No 538-203955-0403	Molex	Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM RECEPT 40CKT Learn More about Molex fsb5 b2b connectors	Datasheet	1.533In Stock	Cut Tape Rp45.865 Rp39.077 Rp34.857 Rp33.206 Reel Rp28.987 View Rp31.005 Rp29.721 Rp29.537 Rp28.620	Min.: 1 Mult.: 1 : 3.300	Receptacles	40 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	5 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	203955	Reel, Cut Tape
Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM RECEPT 50CKT 203955-0503 Molex 1: Rp59.991 4.883In Stock	Mfr. Part No. 203955-0503 Mouser Part No 538-203955-0503	Molex	Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM RECEPT 50CKT Learn More about Molex fsb5 b2b connectors	Datasheet	4.883In Stock	Cut Tape Rp59.991 Rp51.002 Rp45.498 Rp43.480 Reel Rp33.206 View Rp40.728 Rp38.710 Rp37.976 Rp32.106	Min.: 1 Mult.: 1 : 3.300	Receptacles	50 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	5 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	203955	Reel, Cut Tape
Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM RECEPT 60CKT 203955-0603 Molex 1: Rp65.495 2.661In Stock 9.900Expected 31/12/2026	Mfr. Part No. 203955-0603 Mouser Part No 538-203955-0603	Molex	Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM RECEPT 60CKT Learn More about Molex fsb5 b2b connectors	Datasheet	2.661In Stock 9.900Expected 31/12/2026	Cut Tape Rp65.495 Rp55.772 Rp49.718 Rp47.333 View Reel Rp35.591 Rp44.397 Rp42.379 Rp41.829 Rp35.591 Quote MouseReel Available	Min.: 1 Mult.: 1 : 3.300	Receptacles	60 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	5 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	203955	Reel, Cut Tape, MouseReel
Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM PLUG 30CKT 203956-0303 Molex 1: Rp47.883 1.219In Stock 6.600Expected 29/10/2026	Mfr. Part No. 203956-0303 Mouser Part No 538-203956-0303	Molex	Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM PLUG 30CKT Learn More about Molex fsb5 b2b connectors	Datasheet	1.219In Stock 6.600Expected 29/10/2026	Cut Tape Rp47.883 Rp40.912 Rp36.509 Rp34.674 Reel Rp25.868 View Rp32.472 Rp31.005 Rp26.785 Rp25.134	Min.: 1 Mult.: 1 : 2.200	Headers	30 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	5 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	203956	Reel, Cut Tape
Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM PLUG 60CKT 203956-0603 Molex 1: Rp73.567 5.094In Stock	Mfr. Part No. 203956-0603 Mouser Part No 538-203956-0603	Molex	Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM PLUG 60CKT Learn More about Molex fsb5 b2b connectors	Datasheet	5.094In Stock	Cut Tape Rp73.567 Rp62.560 Rp55.955 Rp53.203 View Reel Rp40.545 Rp49.901 Rp47.516 Rp41.829 Rp40.545 MouseReel Available	Min.: 1 Mult.: 1 : 2.200	Headers	60 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	5 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	203956	Reel, Cut Tape, MouseReel
Board to Board & Mezzanine Connectors .40mm SlimStack Rec Floating 50Ckt 204927-0501 Molex 1: Rp73.567 2.976In Stock	Mfr. Part No. 204927-0501 Mouser Part No 538-204927-0501	Molex	Board to Board & Mezzanine Connectors .40mm SlimStack Rec Floating 50Ckt Learn More about Molex fsb5 b2b connectors	Datasheet	2.976In Stock	Cut Tape Rp73.567 Rp62.560 Rp55.955 Rp53.203 View Reel Rp42.746 Rp49.901 Rp47.516 Rp46.599 Rp42.746 Quote	Min.: 1 Mult.: 1 : 3.000	Receptacles	50 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	3 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	204927	Reel, Cut Tape
Board to Board & Mezzanine Connectors 0.4 FLOATING BB Plug PKG 30ckt 204928-0301 Molex 1: Rp71.366 2.510In Stock 9.000Expected 03/12/2026	Mfr. Part No. 204928-0301 Mouser Part No 538-204928-0301	Molex	Board to Board & Mezzanine Connectors 0.4 FLOATING BB Plug PKG 30ckt Learn More about Molex fsb5 b2b connectors	Datasheet	2.510In Stock 9.000Expected 03/12/2026	Cut Tape Rp71.366 Rp60.725 Rp54.304 Rp51.736 View Reel Rp40.545 Rp48.433 Rp46.048 Rp44.948 Rp40.545 Quote	Min.: 1 Mult.: 1 : 3.000	Headers	30 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	3 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	204928	Reel, Cut Tape
Board to Board & Mezzanine Connectors .40mm SlimStack Floating Plug 60Ckt 204928-0601 Molex 1: Rp95.950 518In Stock	Mfr. Part No. 204928-0601 Mouser Part No 538-204928-0601	Molex	Board to Board & Mezzanine Connectors .40mm SlimStack Floating Plug 60Ckt Learn More about Molex fsb5 b2b connectors	Datasheet	518In Stock	Cut Tape Rp95.950 Rp81.640 Rp76.503 Rp72.834 View Reel Rp54.488 Rp69.348 Rp65.128 Rp63.477 Rp60.725 Rp54.488	Min.: 1 Mult.: 1 : 3.000	Headers	60 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	3 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	204928	Reel, Cut Tape
Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM PLUG 40CKT 203956-0403 Molex 1: Rp54.121 335In Stock 13.200Expected 07/01/2027	Mfr. Part No. 203956-0403 Mouser Part No 538-203956-0403	Molex	Board to Board & Mezzanine Connectors SLIMSTACK FSB5 .40MM PLUG 40CKT Learn More about Molex fsb5 b2b connectors	Datasheet	335In Stock 13.200Expected 07/01/2027	Cut Tape Rp54.121 Rp46.048 Rp41.095 Rp39.077 Reel Rp29.904 View Rp36.692 Rp35.041 Rp30.087 Rp29.354	Min.: 1 Mult.: 1 : 2.200	Headers	40 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	5 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	203956	Reel, Cut Tape
Board to Board & Mezzanine Connectors .40mm SlimStack Floating Plug 40Ckt 204928-0401 Molex 1: Rp79.805 219In Stock 9.000Expected 03/12/2026	Mfr. Part No. 204928-0401 Mouser Part No 538-204928-0401	Molex	Board to Board & Mezzanine Connectors .40mm SlimStack Floating Plug 40Ckt Learn More about Molex fsb5 b2b connectors	Datasheet	219In Stock 9.000Expected 03/12/2026	Cut Tape Rp79.805 Rp67.880 Rp60.542 Rp57.790 View Reel Rp45.315 Rp54.121 Rp51.919 Rp45.315	Min.: 1 Mult.: 1 : 3.000	Headers	40 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	3 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	204928	Reel, Cut Tape
Board to Board & Mezzanine Connectors .40mm SlimStack Rec Floating 60Ckt 204927-0601 Molex 1: Rp78.888 321In Stock	Mfr. Part No. 204927-0601 Mouser Part No 538-204927-0601	Molex	Board to Board & Mezzanine Connectors .40mm SlimStack Rec Floating 60Ckt Learn More about Molex fsb5 b2b connectors	Datasheet	321In Stock	Cut Tape Rp78.888 Rp67.146 Rp59.991 Rp57.056 View Reel Rp44.764 Rp53.570 Rp51.185 Rp49.351 Rp44.764 Quote	Min.: 1 Mult.: 1 : 3.000	Receptacles	60 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	3 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	204927	Reel, Cut Tape
Board to Board & Mezzanine Connectors .40mm SlimStack Rec Floating 40Ckt 204927-0401 Molex 1: Rp68.431 8.959Expected 16/10/2026	Mfr. Part No. 204927-0401 Mouser Part No 538-204927-0401	Molex	Board to Board & Mezzanine Connectors .40mm SlimStack Rec Floating 40Ckt Learn More about Molex fsb5 b2b connectors	Datasheet	8.959Expected 16/10/2026	Cut Tape Rp68.431 Rp58.157 Rp51.919 Rp49.534 View Reel Rp38.710 Rp46.415 Rp44.214 Rp43.847 Rp38.710	Min.: 1 Mult.: 1 : 3.000	Receptacles	40 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	3 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper	Liquid Crystal Polymer (LCP)	204927	Reel, Cut Tape
Board to Board & Mezzanine Connectors SlimStack Board-to-Board Plug, 0.40mm Pitch, FSB3 Floating Series, 3.00mm Mated Height, 3.20 Mated Width, Without Cover Tape, 20 Circuits 204928-0202 Molex 9.000: Rp5.210 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. 204928-0202 Mouser Part No 538-204928-0202	Molex	Board to Board & Mezzanine Connectors SlimStack Board-to-Board Plug, 0.40mm Pitch, FSB3 Floating Series, 3.00mm Mated Height, 3.20 Mated Width, Without Cover Tape, 20 Circuits	Datasheet	Non-Stocked Lead-Time 12 Weeks	Cut Tape Rp5.210	Min.: 9.000 Mult.: 9.000 : 3.000	Plug	20 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	3 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper Alloy	Liquid Crystal Polymer (LCP)	204928	Reel
Board to Board & Mezzanine Connectors SlimStack Board-to-Board Plug, 0.40mm Pitch, FSB3 Floating Series, 3.00mm Mated Height, 3.20 Mated Width, Without Cover Tape, 60 Circuits 204928-0602 Molex 1: Rp1.835 Non-Stocked Lead-Time 12 Weeks New At Mouser	Mfr. Part No. 204928-0602 Mouser Part No 538-204928-0602 New At Mouser	Molex	Board to Board & Mezzanine Connectors SlimStack Board-to-Board Plug, 0.40mm Pitch, FSB3 Floating Series, 3.00mm Mated Height, 3.20 Mated Width, Without Cover Tape, 60 Circuits	Datasheet	Non-Stocked Lead-Time 12 Weeks	Cut Tape Rp1.835 Rp36,7 Rp18,3 Reel Rp18,3	Min.: 1 Mult.: 1 : 3.000	Plug	60 Position	0.4 mm (0.016 in)	2 Row	Solder	Vertical	3 mm	300 mA	40 V	- 40 C	+ 125 C	Gold	Copper Alloy	Liquid Crystal Polymer (LCP)	204928	Reel, Cut Tape
Board to Board & Mezzanine Connectors .4 FLOATING BB CONN H=5 REC PKG 203955-0202 Molex 13.200: Rp22.382 Non-Stocked	Mfr. Part No. 203955-0202 Mouser Part No 538-203955-0202	Molex	Board to Board & Mezzanine Connectors .4 FLOATING BB CONN H=5 REC PKG Learn More about Molex fsb5 b2b connectors	Datasheet	Non-Stocked	Cut Tape Rp22.382	Min.: 13.200 Mult.: 13.200 : 3.300															203955	Reel
Board to Board & Mezzanine Connectors .4 FLOATING BB CONN H=5 REC PKG 203955-0302 Molex 13.200: Rp25.317 Non-Stocked	Mfr. Part No. 203955-0302 Mouser Part No 538-203955-0302	Molex	Board to Board & Mezzanine Connectors .4 FLOATING BB CONN H=5 REC PKG Learn More about Molex fsb5 b2b connectors	Datasheet	Non-Stocked	Cut Tape Rp25.317	Min.: 13.200 Mult.: 13.200 : 3.300															203955	Reel
Board to Board & Mezzanine Connectors .4 FLOATING BB CONN H=5 REC PKG 203955-0402 Molex 9.900: Rp28.803 Non-Stocked	Mfr. Part No. 203955-0402 Mouser Part No 538-203955-0402	Molex	Board to Board & Mezzanine Connectors .4 FLOATING BB CONN H=5 REC PKG Learn More about Molex fsb5 b2b connectors	Datasheet	Non-Stocked	Cut Tape Rp28.803	Min.: 9.900 Mult.: 9.900 : 3.300															203955	Reel

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