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 (THB) 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: ฿114.29 8,729In 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	8,729In Stock	Cut Tape ฿114.29 ฿97.29 ฿86.97 ฿82.63 Reel ฿67.97 View ฿77.64 ฿73.97 ฿72.64 ฿62.97	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: ฿100.63 9,827In 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	9,827In Stock	Cut Tape ฿100.63 ฿85.63 ฿76.64 ฿72.97 Reel ฿56.31 View ฿68.31 ฿64.97 ฿62.97 ฿54.31	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 SLIMSTACK FSB5 .40MM RECEPT 30CKT 203955-0303 Molex 1: ฿78.64 8,116In 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	8,116In Stock	Cut Tape ฿78.64 ฿66.97 ฿59.98 ฿56.98 Reel ฿44.32 View ฿53.31 ฿50.98 ฿48.31 ฿41.98	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 RECEPT 20CKT 203955-0203 Molex 1: ฿68.64 15,763In Stock	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	15,763In Stock	Cut Tape ฿68.64 ฿59.98 ฿54.31 ฿51.98 Reel ฿41.32 View ฿48.65 ฿45.98 ฿44.98 ฿38.32 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 0.4 FLOATING BB Rec PKG 30ckt 204927-0301 Molex 1: ฿119.62 11,696In 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	11,696In Stock	Cut Tape ฿119.62 ฿101.63 ฿90.63 ฿86.30 Reel ฿67.64 View ฿80.97 ฿77.30 ฿76.30 ฿66.31 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 .40mm SlimStack Rec Floating 40Ckt 204927-0401 Molex 1: ฿124.28 8,959In Stock	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	8,959In Stock	Cut Tape ฿124.28 ฿105.62 ฿94.30 ฿89.96 View Reel ฿70.31 ฿84.30 ฿80.30 ฿79.63 ฿70.31 Quote	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 FSB5 .40MM PLUG 20CKT 203956-0203 Molex 1: ฿80.97 4,617In 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	4,617In Stock	Cut Tape ฿80.97 ฿71.97 ฿64.31 ฿61.31 Reel ฿45.32 View ฿56.98 ฿54.64 ฿45.65 ฿44.32 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 30CKT 203956-0303 Molex 1: ฿86.97 1,119In Stock 6,600Expected 10/30/2026	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	1,119In Stock 6,600Expected 10/30/2026	Cut Tape ฿86.97 ฿74.30 ฿66.31 ฿62.97 Reel ฿46.98 View ฿58.98 ฿56.31 ฿48.65 ฿45.65	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 50CKT 203956-0503 Molex 1: ฿111.29 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 ฿111.29 ฿94.63 ฿84.63 ฿80.63 View Reel ฿61.31 ฿75.64 ฿71.97 ฿63.97 ฿61.31	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: ฿157.94 3,706In 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	3,706In Stock	Cut Tape ฿157.94 ฿134.28 ฿125.95 ฿119.95 View Reel ฿91.96 ฿114.29 ฿106.96 ฿104.96 ฿98.96 ฿91.96	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: ฿83.30 1,486In 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	1,486In Stock	Cut Tape ฿83.30 ฿70.97 ฿63.31 ฿60.31 Reel ฿52.65 View ฿56.31 ฿53.98 ฿53.65 ฿51.98	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: ฿108.96 4,790In 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	4,790In Stock	Cut Tape ฿108.96 ฿92.63 ฿82.63 ฿78.97 Reel ฿60.31 View ฿73.97 ฿70.31 ฿68.97 ฿58.31	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: ฿118.95 2,641In Stock 9,900Expected 10/30/2026	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	2,641In Stock 9,900Expected 10/30/2026	Cut Tape ฿118.95 ฿101.29 ฿90.30 ฿85.97 View Reel ฿64.64 ฿80.63 ฿76.97 ฿75.97 ฿64.64 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 60CKT 203956-0603 Molex 1: ฿133.61 5,074In 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	5,074In Stock	Cut Tape ฿133.61 ฿113.62 ฿101.63 ฿96.63 View Reel ฿73.64 ฿90.63 ฿86.30 ฿75.97 ฿73.64 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: ฿133.61 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 ฿133.61 ฿113.62 ฿101.63 ฿96.63 View Reel ฿77.64 ฿90.63 ฿86.30 ฿84.63 ฿77.64 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: ฿129.61 2,510In Stock 9,000Expected 12/3/2026	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 12/3/2026	Cut Tape ฿129.61 ฿110.29 ฿98.63 ฿93.96 View Reel ฿73.64 ฿87.96 ฿83.63 ฿81.63 ฿73.64 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 SLIMSTACK FSB5 .40MM PLUG 40CKT 203956-0403 Molex 1: ฿98.29 315In Stock 13,200Expected 1/7/2027	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	315In Stock 13,200Expected 1/7/2027	Cut Tape ฿98.29 ฿83.63 ฿74.64 ฿70.97 Reel ฿54.31 View ฿66.64 ฿63.64 ฿54.64 ฿53.31	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 Rec Floating 60Ckt 204927-0601 Molex 1: ฿143.28 717In 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	717In Stock	Cut Tape ฿143.28 ฿121.95 ฿108.96 ฿103.63 View Reel ฿81.30 ฿97.29 ฿92.96 ฿89.63 ฿81.30 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 Floating Plug 40Ckt 204928-0401 Molex 1: ฿144.94 219In Stock 9,000Expected 12/3/2026	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 12/3/2026	Cut Tape ฿144.94 ฿123.28 ฿109.96 ฿104.96 View Reel ฿82.30 ฿98.29 ฿94.30 ฿82.30	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 Floating Plug 60Ckt 204928-0601 Molex 1: ฿174.26 377In 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	377In Stock	Cut Tape ฿174.26 ฿148.27 ฿138.94 ฿132.28 View Reel ฿98.96 ฿125.95 ฿118.29 ฿115.29 ฿110.29 ฿98.96	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 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: ฿9.46 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 ฿9.46	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: ฿3.33 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 ฿3.33 ฿0.067 ฿0.033 Reel ฿0.033	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: ฿40.65 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 ฿40.65	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: ฿45.98 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 ฿45.98	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: ฿52.31 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 ฿52.31	Min.: 9,900 Mult.: 9,900 : 3,300															203955	Reel

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