{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BM20B(0.8)-34DP-0.4V(51)","brand":"Hirose Electric Co Ltd","brandSlug":"hirose-electric-co-ltd","productSlug":"BM20B~10.8~2-34DP-0.4V~151~2","canonicalUrl":"https://icsourcedirect.com/hirose-electric-co-ltd/BM20B~10.8~2-34DP-0.4V~151~2","factsUrl":"https://icsourcedirect.com/api/mcp/products/BM20B(0.8)-34DP-0.4V(51)","rawCanonicalId":null},"summary":{"shortDescription":"Hirose BM20 series header, outer shroud contacts, 34 positions, 2 rows, 0.016\" (0.40mm) pitch, 0.026\" (0.65mm) height above board, 0.8mm mated stacking height, gold contact finish, surface mount, solder retention.","salesMarkdown":"## What the 0.40mm pitch and 0.8mm stack height mean for the board gap The Hirose BM20B(0.8)-34DP-0.4V(51) is a 34-position header from the BM20 series, built for tight board-to-board stacking. The 0.016\" (0.40mm) pitch and 0.8mm mated stacking height define the z-axis budget — the gap between the two PCBs is exactly 0.8mm when mated with the matching BM20 series receptacle. The 2.00µin (0.051µm) gold contact finish is a light flash — adequate for the single mate cycle of a production board stack, but not designed for repeated disconnect/reconnect in the field. ## 34 positions — matching the BOM line The 34 circuits match the position count on the schematic. At 0.40mm pitch, the wipe has to seat at the worst case of the stack tolerance; the shroud helps absorb the misalignment so the gold contacts still land on the receptacle pads. The 34-position count and 0.40mm pitch are the two checks against the BOM; confirm the mating BM20 series receptacle before committing. The BM20B(0.8)-34DP-0.4V(51) sits between the 30-position BM20B(0.8)-30DP-0.4V(51) and the 40-position BM20B(0.8)-40DP-0.4V(51) in the same BM20 series. All three share the 0.016\" (0.40mm) pitch, 0.026\" (0.65mm) height above board, 0.8mm mated stacking height, and 2.00µin gold contact finish. There is no 34-position variant with a different plating or stack height in this series; the (51) suffix denotes the standard 0.8mm stack height version.","metaTitle":"Hirose BM20B(0.8)-34DP-0.4V(51) Header, 34 Pos, 0.40mm Pitch","metaDescription":"Hirose BM20 series header, 34 positions, 0.016\" (0.40mm) pitch, 0.8mm stacking height, gold contacts, SMT. Active production, sourced per RFQ.","metaKeywords":null},"attributes":{"series":"BM20","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":"BM20","Package":"Tape & Reel (TR) Cut Tape (CT)","Features":"Solder Retention","Mounting Type":"Surface Mount","Connector Type":"Header, Outer Shroud Contacts","Contact Finish":"Gold","Number of Rows":"2","Product Status":"Active","lifecycle_stage":"unknown","Height Above Board":"0.026\\\" (0.65mm)","Base Product Number":"BM20B","Number of Positions":"34","Mated Stacking Heights":"0.8mm","Contact Finish Thickness":"2.00µin (0.051µm)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.5000","priceTiers":[{"qty":1,"price":"$1.50000","currency":"USD"},{"qty":10,"price":"$1.30500","currency":"USD"},{"qty":25,"price":"$1.25000","currency":"USD"},{"qty":50,"price":"$1.22200","currency":"USD"},{"qty":100,"price":"$1.16660","currency":"USD"},{"qty":250,"price":"$1.05544","currency":"USD"},{"qty":500,"price":"$0.97212","currency":"USD"},{"qty":1000,"price":"$0.83325","currency":"USD"},{"qty":2500,"price":"$0.77770","currency":"USD"},{"qty":8000,"price":"$0.72215","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icsourcedirect.com/290b4cbd6888a2538ee728cd73c27f4c.pdf","sourceUrl":null,"alternativesUrl":"https://icsourcedirect.com/api/mcp/products/BM20B(0.8)-34DP-0.4V(51)/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy BM20B(0.8)-34DP-0.4V(51) and what is the lead time?","answer":"Submit an RFQ for the quantity needed."},{"question":"What is the exact pitch and stacking height of BM20B(0.8)-34DP-0.4V(51)?","answer":"The pitch is 0.016\" (0.40mm) and the mated stacking height is 0.8mm. These three dimensions define the board-to-board gap and the footprint pitch."},{"question":"What is the contact finish thickness of BM20B(0.8)-34DP-0.4V(51)?","answer":"The contact finish is gold with a thickness of 2.00µin (0.051µm). This is a light flash suitable for a single mate cycle in a production board stack."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icsourcedirect.com/hirose-electric-co-ltd/BM20B~10.8~2-34DP-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/BM20B~10.8~2-34DP-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}}