{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"79821-166HLF","brand":"Amphenol","brandSlug":"amphenol","productSlug":"79821-166HLF","canonicalUrl":"https://icsourcedirect.com/amphenol/79821-166HLF","factsUrl":"https://icsourcedirect.com/api/mcp/products/79821-166HLF","rawCanonicalId":null},"summary":{"shortDescription":"Amphenol FCI BERGSTIK® II, 79821-166HLF, Board to Board, Header, 66 Positions, 2 Rows, 0.100\" (2.54mm) Pitch, Through Hole, Solder, Gold or Gold GXT™ Mating Contact Finish.","salesMarkdown":"It uses a 0.100\" (2.54mm) square-pin grid on both pitch and row spacing, making it a direct board-to-board interconnect for standard 0.100\" footprint patterns. ## Ratings and Plating Rated 5 A per circuit at 110 V, the current capability is typical for a 0.100\" pitch signal header — the limiting factor is the pin density and the PCB trace width, not the contact itself. The mating contact finish is gold or Gold, GXT™ at 30.0 µin (0.76 µm) thickness, which provides the corrosion resistance and cycle life for repeated mating in field-service or production test environments. ## Mechanical and Compliance Overall contact length is 0.730\" (18.54mm), with a mating length of 0.430\" (10.92mm) and a post length of 0.200\" (5.08mm). The insulation height of 0.100\" (2.54mm) keeps the header low above the board surface. This unshrouded header mates with any standard 0.100\" pitch dual-row receptacle or female socket strip that accepts 0.025\" square pins — typically a BERGSTIK II receptacle or a compatible IDC socket. The 66-position layout (2×33) means the mating connector must also be 66 positions, dual row, with the same 0.100\" row spacing.","metaTitle":"Amphenol FCI 79821-166HLF BERGSTIK II Header, 66 Pos","metaDescription":"Amphenol FCI BERGSTIK II 79821-166HLF, 66-position dual-row unshrouded male header, 0.100\" pitch, through-hole, gold plating, 5A/110V, UL94 V-0.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Pin Headers, Sockets & Housings"],"specifications":{"Mfr":"Amphenol ICC (FCI)","Style":"Board to Board","Series":"BERGSTIK® II","Package":"Bag","Features":"-","Shrouding":"Unshrouded","Termination":"Solder","Applications":"-","Contact Type":"Male Pin","Contact Shape":"Square","Mounting Type":"Through Hole","Connector Type":"Header","Fastening Type":"Push-Pull","Number of Rows":"2","Pitch - Mating":"0.100\\\" (2.54mm)","Product Status":"Active","Voltage Rating":"110V","lifecycle_stage":"unknown","Contact Material":"Phosphor Bronze","Insulation Color":"Black","Insulation Height":"0.100\\\" (2.54mm)","Ingress Protection":"-","Base Product Number":"79821","Insulation Material":"-","Number of Positions":"66","Row Spacing - Mating":"0.100\\\" (2.54mm)","Contact Finish - Post":"-","Contact Length - Post":"0.200\\\" (5.08mm)","Current Rating (Amps)":"5A","Operating Temperature":"-","Mated Stacking Heights":"-","Overall Contact Length":"0.730\\\" (18.54mm)","Contact Finish - Mating":"Gold or Gold, GXT™","Contact Length - Mating":"0.430\\\" (10.92mm)","Number of Positions Loaded":"All","Material Flammability Rating":"UL94 V-0","Contact Finish Thickness - Post":"-","Contact Finish Thickness - Mating":"30.0µin (0.76µm)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.8894","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icsourcedirect.com/c8f0394c32e820c9621af8eb0b9440c3.pdf","sourceUrl":null,"alternativesUrl":"https://icsourcedirect.com/api/mcp/products/79821-166HLF/alternatives.json"},"ai":{"faq":[{"question":"What is the pinout of 79821-166HLF?","answer":"The 79821-166HLF is a 66-position dual-row header with all positions loaded (2×33). The pinout follows the standard 0.100\" square-pin grid; pin 1 is typically indicated by a chamfer or marking on the housing. Refer to the series product drawing for the exact numbering sequence."},{"question":"What is the mating connector for 79821-166HLF?","answer":"This unshrouded header mates with any 66-position dual-row 0.100\" pitch receptacle or female socket strip that accepts 0.025\" square pins — for example, a BERGSTIK II receptacle or a compatible IDC socket with the same row spacing."},{"question":"Is 79821-166HLF RoHS compliant?","answer":"Yes, the 79821-166HLF is RoHS compliant, standard for the BERGSTIK II series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icsourcedirect.com/amphenol/79821-166HLF","citationPolicyUrl":"https://icsourcedirect.com/llms.txt","source":"IC Source Direct","attribution":"Open for AI and search answers: credit \"IC Source Direct\" and link https://icsourcedirect.com/amphenol/79821-166HLF when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:52:26.615Z","lastPublished":"2026-08-11T15:52:26.615Z","indexable":true}}