{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"0039299186","brand":"Molex","brandSlug":"molex","productSlug":"0039299186","canonicalUrl":"https://icsourcedirect.com/molex/0039299186","factsUrl":"https://icsourcedirect.com/api/mcp/products/0039299186","rawCanonicalId":null},"summary":{"shortDescription":"Molex Mini-Fit Jr 5566 series header, 0039299186, 18 positions, 2-row, 4.20 mm pitch, through-hole, vertical, shrouded with board lock and locking ramp, tin-plated contacts, UL94 V-0 natural nylon, tray.","salesMarkdown":"## 18-Position Header with Locking Ramp for Vibration-Prone Harnesses The 0039299186 is a Molex Mini-Fit Jr 5566 series header, 18 circuits in two rows at 4.20 mm pitch — the same pitch as the matching crimp receptacle housing. ## Board Footprint and Solder Anchoring The board lock snaps into a plated through-hole and holds the header flush during reflow; no secondary hold-down fixture needed for most wave-solder profiles. Insulation height is 0.504\" (12.80 mm) above the board — the vertical profile leaves clearance underneath for bottom-side components in a tight enclosure. ## Mating Half and Contact Finish This header mates with Mini-Fit Jr 5557 receptacle housings and 5556 crimp terminals. Tin works well in dry-circuit signal applications where the contact voltage wipes through any surface oxide on first mate. Contact material is brass, post finish is tin (35.0 µinch / 0.90 µm). The square pin geometry gives four contact points per circuit in the receptacle terminal, distributing the current load across the interface. The base product number is 003929; this variant carries the full 18-position load in a tray package. No official cross-reference or pin-compatible alternate from Molex is listed — the Mini-Fit Jr 5566 series is the only direct fit.","metaTitle":"Molex 0039299186 Mini-Fit Jr Header 18 Pos 4.2mm","metaDescription":"Molex 0039299186 Mini-Fit Jr 5566 header, 18 circuits, 4.20 mm pitch, through-hole, locking ramp, board lock, UL94 V-0. Active production. Sourced per RFQ.","metaKeywords":null},"attributes":{"series":"Mini-Fit Jr 5566","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Pin Headers, Sockets & Housings","Pin Headers"],"specifications":{"Mfr":"Molex","Style":"Board to Cable/Wire","Series":"Mini-Fit Jr 5566","Package":"Tray","Features":"Board Lock","Shrouding":"Shrouded - 4 Wall","Termination":"Solder","Applications":"General Purpose, Industrial, Telecommunications","Contact Type":"Male Pin","Contact Shape":"Square","Mounting Type":"Through Hole","Connector Type":"Header","Fastening Type":"Locking Ramp","Number of Rows":"2","Pitch - Mating":"0.165\\\" (4.20mm)","Product Status":"Active","Voltage Rating":"-","lifecycle_stage":"unknown","Contact Material":"Brass","Insulation Color":"Natural","Insulation Height":"0.504\\\" (12.80mm)","Ingress Protection":"-","Base Product Number":"003929","Insulation Material":"Polyamide (PA66), Nylon 6/6","Number of Positions":"18","Row Spacing - Mating":"0.165\\\" (4.20mm)","Contact Finish - Post":"Tin","Contact Length - Post":"0.138\\\" (3.50mm)","Current Rating (Amps)":"-","Operating Temperature":"-","Mated Stacking Heights":"-","Overall Contact Length":"-","Contact Finish - Mating":"Tin","Contact Length - Mating":"-","Number of Positions Loaded":"All","Material Flammability Rating":"UL94 V-0","Contact Finish Thickness - Post":"35.0µin (0.90µm)","Contact Finish Thickness - Mating":"35.4µin (0.90µm)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.6000","priceTiers":[{"qty":1,"price":"$4.60000","currency":"USD"},{"qty":10,"price":"$4.04400","currency":"USD"},{"qty":80,"price":"$3.21688","currency":"USD"},{"qty":945,"price":"$2.66539","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icsourcedirect.com/91adb2b0e25e5bffdfb7eb781672472f.pdf","sourceUrl":null,"alternativesUrl":"https://icsourcedirect.com/api/mcp/products/0039299186/alternatives.json"},"ai":{"faq":[{"question":"Is 0039299186 RoHS compliant?","answer":"Yes, the 0039299186 is ROHS3 compliant."},{"question":"What is the mating connector for 0039299186?","answer":"This header mates with Mini-Fit Jr 5557 receptacle housings and 5556 crimp terminals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icsourcedirect.com/molex/0039299186","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/molex/0039299186 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}}