{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"DF40TC(3.0)-40DS-0.4V(51)","brand":"Hirose Electric Co Ltd","brandSlug":"hirose-electric-co-ltd","productSlug":"DF40TC~13.0~2-40DS-0.4V~151~2","canonicalUrl":"https://icsourcedirect.com/hirose-electric-co-ltd/DF40TC~13.0~2-40DS-0.4V~151~2","factsUrl":"https://icsourcedirect.com/api/mcp/products/DF40TC(3.0)-40DS-0.4V(51)","rawCanonicalId":null},"summary":{"shortDescription":"Hirose DF40T series receptacle, center strip contacts, 0.016\" (0.40mm) pitch, 40 positions, 2 rows, 3mm mated stacking height, surface mount, gold contact finish.","salesMarkdown":"## What this 0.40 mm pitch mezzanine receptacle does that a wider-pitch part cannot The Hirose DF40TC(3.0)-40DS-0.4V(51) is a 40-position, 2-row receptacle from the DF40T series, built for board-to-board mezzanine stacking at a mated height of 3 mm. At 0.016\" (0.40 mm) pitch, it packs 40 I/Os into a footprint that a 0.50 mm or 0.80 mm pitch part would need nearly double the board real estate to deliver. The gold finish is there to keep contact resistance stable through a handful of mates, not to survive hundreds of reconnects. Surface-mount termination with pick-and-place and solder retention features means it runs through a standard reflow line without special handling. ## The 3 mm stack height sets the board gap — measure your enclosure before you commit The mated stacking height of 3 mm is the single dimension that decides whether this connector fits your board stack. That is the distance between the two PCBs when the receptacle is mated with its matching header. If your enclosure or mezzanine card gap is tighter than 3 mm, this part will not fit. If it is wider, the connector may not maintain contact beam pressure. The DF40T series includes variants with other stacking heights — this one is fixed at 3 mm. The receptacle itself sits 0.114\" (2.90 mm) above the board surface before mating, so the header side contributes the remaining 0.10 mm to reach the 3 mm total. ## Gold flash plating — what it means for mating cycle life That is flash plating — the thinnest gold layer in common use. It prevents oxidation during storage and initial mating, but it wears through after a few dozen cycles. For comparison, a connector rated for 500+ mating cycles typically carries 30 µin or more of gold. The gold is there for corrosion protection during the product life, not for wear life. ## SMT assembly features that keep the line moving The DF40TC(3.0)-40DS-0.4V(51) includes pick-and-place vacuum pick area and solder retention features. The pick-and-place surface lets the placement nozzle handle the part without a custom nozzle. Without them, a 40-position, 0.40 mm pitch part would be prone to tombstoning or shifting during reflow. The part ships in Tape & Reel packaging, which is the standard feed format for high-speed SMT lines.","metaTitle":"Hirose DF40TC(3.0)-40DS-0.4V(51) Receptacle, 0.40mm Pitch","metaDescription":"Hirose DF40TC(3.0)-40DS-0.4V(51) receptacle, 0.016\" (0.40mm) pitch, 40 positions, 2 rows, 3mm stacking height. Gold contacts. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Board-to-Board Connectors"],"specifications":{"Mfr":"Hirose Electric Co Ltd","Pitch":"0.016\\\" (0.40mm)","Series":"DF40T","Package":"Tape & Reel (TR)","Features":"Pick and Place, Solder Retention","Mounting Type":"Surface Mount","Connector Type":"Receptacle, Center Strip Contacts","Contact Finish":"Gold","Number of Rows":"2","Product Status":"Active","lifecycle_stage":"unknown","Height Above Board":"0.114\\\" (2.90mm)","Number of Positions":"40","Mated Stacking Heights":"3mm","Contact Finish Thickness":"1.97µin (0.050µm)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.7460","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icsourcedirect.com/ee353916a52fdc0d2aa13cbbf97c384a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the stacking height of DF40TC(3.0)-40DS-0.4V(51)?","answer":"The mated stacking height is 3 mm. The receptacle itself sits 0.114\" (2.90 mm) above the board; the mating header contributes the remaining height to reach the 3 mm total."},{"question":"Is DF40TC(3.0)-40DS-0.4V(51) RoHS compliant?","answer":"The part is listed as RoHS compliant per Hirose's standard DF40T series documentation. The gold contact finish and the liquid crystal polymer housing are both RoHS-compatible materials."},{"question":"What is the pitch of the Hirose DF40T connector?","answer":"The DF40T series uses a 0.016\" (0.40 mm) pitch. This is consistent across all DF40T variants, including the DF40TC(3.0)-40DS-0.4V(51)."},{"question":"Where can I buy DF40TC(3.0)-40DS-0.4V(51)?","answer":"This part is active and quoted to order against your BOM quantity."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icsourcedirect.com/hirose-electric-co-ltd/DF40TC~13.0~2-40DS-0.4V~151~2","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/hirose-electric-co-ltd/DF40TC~13.0~2-40DS-0.4V~151~2 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}}