{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"DF37NB-40DS-0.4V(53)","brand":"Hirose Electric Co Ltd","brandSlug":"hirose-electric-co-ltd","productSlug":"DF37NB-40DS-0.4V~153~2","canonicalUrl":"https://icsourcedirect.com/hirose-electric-co-ltd/DF37NB-40DS-0.4V~153~2","factsUrl":"https://icsourcedirect.com/api/mcp/products/DF37NB-40DS-0.4V(53)","rawCanonicalId":null},"summary":{"shortDescription":"Hirose DF37 series, 40-position receptacle, center strip contacts, 0.40mm pitch, dual-row, surface mount, gold-plated contacts, 0.97mm height above board, solder retention features.","salesMarkdown":"## 0.40mm Pitch, 40-Position Mezzanine Receptacle — the Z-Height is the Constraint The Hirose DF37NB-40DS-0.4V(53) is a 40-position receptacle from the DF37 series, designed for board-to-board mezzanine stacking. The 0.016\" (0.40mm) pitch packs 40 circuits into a dual-row layout, and the 0.038\" (0.97mm) height above board sets a tight z-height budget — the mated stacking height is 0.98mm. This is the dimension that drives the PCB gap: if your board stack-up calls for a 1.0mm or 1.2mm separation, this part lands right at the lower end of the range. The center strip contact arrangement mates only with the matching DF37 header — it is not a generic 0.40mm pitch socket. ## Gold Flash Plating — Low Mating Cycle Duty The contacts carry 2.00µin (0.051µm) of gold over the base metal — a flash plating. The gold ensures low contact resistance at first mate; the thin layer will wear through under repeated cycling, exposing the nickel underplate. For a one-time board-stacking application inside an enclosure, this is fine. If the connector sees regular disconnect, step up to a thicker gold variant in the DF37 family. The housing includes solder retention features — small metal tabs or dimples that hold the connector flat against the PCB pads during SMT reflow. On a 0.40mm pitch part, even a few degrees of skew or a lifted corner can short adjacent pads. The retention anchors prevent tombstoning and keep the contact-to-pad alignment through the solder solidification phase. This is a practical feature for high-volume pick-and-place lines where the part must survive the oven without shifting. ## 40 Positions vs 34 and 50 — Match the Circuit Count The DF37NB-40DS-0.4V(53) sits between the 34-position DF37NB-34DS-0.4V(51) and the 50-position DF37NB-50DS-0.4V(53) in the same series. All three share the 0.40mm pitch, 0.97mm height, gold flash plating, and solder retention. The 40-position version gives a 7.9mm-wide footprint (40 × 0.40mm ÷ 2 rows), which is 6 positions more than the 34-position variant and 10 fewer than the 50-position option. There is no official cross-reference or second-source; the DF37NB-40DS-0.4V(51) suffix variant is the same connector with a different packaging code (Digi-Reel vs Cut Tape).","metaTitle":"Hirose DF37NB-40DS-0.4V(53), 40-pos 0.40mm Receptacle","metaDescription":"Hirose DF37NB-40DS-0.4V(53) 40-position receptacle, 0.40mm pitch, 0.97mm height, gold contacts, solder retention. Active production, RoHS. Sourced per RFQ.","metaKeywords":null},"attributes":{"series":"DF37","packageCase":null,"mountingType":null,"rohsStatus":"RoHS Compliant","productStatus":"Active","categoryPath":["Board-to-Board Connectors","Mezzanine & Stacking Connectors"],"specifications":{"Mfr":"Hirose Electric Co Ltd","Pitch":"0.016\\\" (0.40mm)","Series":"DF37","Package":"Tape & Reel (TR) Cut Tape (CT)","Features":"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":"0.038\\\" (0.97mm)","Base Product Number":"DF37N","Number of Positions":"40","Mated Stacking Heights":"0.98mm","Contact Finish Thickness":"2.00µin (0.051µm)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.3600","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$1.36000","currency":"USD"},{"qty":10,"price":"$1.18700","currency":"USD"},{"qty":25,"price":"$1.13640","currency":"USD"},{"qty":50,"price":"$1.11100","currency":"USD"},{"qty":100,"price":"$1.06050","currency":"USD"},{"qty":250,"price":"$0.95952","currency":"USD"},{"qty":500,"price":"$0.88376","currency":"USD"},{"qty":1000,"price":"$0.75750","currency":"USD"},{"qty":2000,"price":"$0.73225","currency":"USD"},{"qty":3000,"price":"$0.70700","currency":"USD"},{"qty":5000,"price":"$0.67165","currency":"USD"},{"qty":10000,"price":"$0.65650","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icsourcedirect.com/3aa4291611ad64fcbe6042571475da76.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the mated stacking height of DF37NB-40DS-0.4V(53)?","answer":"The mated stacking height is 0.98mm. The height above board is 0.038\" (0.97mm), so the total gap between parallel PCBs when mated with the matching DF37 header is 0.98mm."},{"question":"What connector mates with DF37NB-40DS-0.4V(53)?","answer":"This receptacle mates with the matching DF37 series header from Hirose. The center strip contact arrangement is specific to the DF37 family — it will not mate with generic 0.40mm pitch sockets or other series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icsourcedirect.com/hirose-electric-co-ltd/DF37NB-40DS-0.4V~153~2","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/DF37NB-40DS-0.4V~153~2 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:46:37.382Z","lastPublished":"2026-07-22T19:46:37.382Z","indexable":true}}