{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3-643821-3","brand":"TE Connectivity AMP Connectors","brandSlug":"te-connectivity-amp-connectors","productSlug":"3-643821-3","canonicalUrl":"https://icsourcedirect.com/te-connectivity-amp-connectors/3-643821-3","factsUrl":"https://icsourcedirect.com/api/mcp/products/3-643821-3","rawCanonicalId":null},"summary":{"shortDescription":"TE Connectivity MTA-156 IDC receptacle, 3 positions, 0.156\" (3.96mm) pitch, single row, tin plating, 26 AWG, free-hanging, locking ramp, blue housing.","salesMarkdown":"## What This MTA-156 IDC Receptacle Does in a Harness The 0.156\" (3.96mm) pitch matches the MTA-156 header pin row, so the board footprint is set by that spacing. The single-row, 3-position layout is meant for low-circuit-count signal or low-power distribution — think sensor leads, control panel wiring, or internal appliance harnesses where three wires need a reliable, mass-terminated connection to a PCB header. The blue housing carries a closed end and polarizing key, which together prevent the connector from being inserted backwards or over-inserted onto the header — a practical safeguard on an assembly line where orientation mistakes cost rework. The locking ramp snaps over the mating header latch for positive retention under vibration or cable tug. ## Termination and Wire Fit — IDC Only, 26 AWG This is an IDC (insulation displacement) receptacle, not a crimp type. The specified wire gauge is 26 AWG; that is the only supported size for reliable IDC termination. Using a different gauge risks an intermittent or open connection because the slot geometry is fixed for that wire diameter. ## Mating and Mounting — Free-Hanging Receptacle The 3-643821-3 is a free-hanging (in-line) receptacle, so it does not mount to a PCB — it terminates the cable end and mates with a board-mounted MTA-156 header. The single-row, 3-position layout means the mating header will have three pins at 0.156\" pitch. Because the housing has a closed end, the receptacle cannot be pushed past the last header pin — a small detail that prevents pin damage during blind mating in a crowded enclosure. RoHS compliance is confirmed, so the part meets the restriction-of-hazardous-substances requirements for European and most global markets.","metaTitle":"TE Connectivity 3-643821-3 MTA-156 Receptacle, 3 Pos","metaDescription":"TE Connectivity MTA-156 IDC receptacle, 3 positions, 0.156\" pitch, 26 AWG, tin plating. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":"MTA-156","packageCase":null,"mountingType":null,"rohsStatus":"RoHS Compliant","productStatus":"Active","categoryPath":["Circular Connectors","Panel-Mount & In-Line Circular"],"specifications":{"Mfr":"TE Connectivity AMP Connectors","Color":"Blue","Pitch":"0.156\\\" (3.96mm)","Series":"MTA-156","Package":"Bulk","Features":"Closed End, Polarizing Key","Wire Type":"Discrete or Ribbon Cable","Wire Gauge":"26 AWG","Row Spacing":"-","Contact Type":"Female Socket","Mounting Type":"Free Hanging (In-Line)","Connector Type":"Receptacle","Contact Finish":"Tin","Fastening Type":"Locking Ramp","Number of Rows":"1","Product Status":"Active","lifecycle_stage":"unknown","Cable Termination":"IDC","Base Product Number":"643821","Number of Positions":"3","Contact Finish Thickness":"80.0µin (2.03µm)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.3300","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.33000","currency":"USD"},{"qty":10,"price":"$0.29500","currency":"USD"},{"qty":25,"price":"$0.29360","currency":"USD"},{"qty":50,"price":"$0.28760","currency":"USD"},{"qty":100,"price":"$0.24590","currency":"USD"},{"qty":250,"price":"$0.22128","currency":"USD"},{"qty":500,"price":"$0.20898","currency":"USD"},{"qty":1000,"price":"$0.18316","currency":"USD"},{"qty":2500,"price":"$0.18193","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icsourcedirect.com/fdbcce876e4e651cce625f0f39993f5e.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What wire gauge does 3-643821-3 accept?","answer":"The 3-643821-3 accepts 26 AWG wire only, for IDC termination to discrete or ribbon cable. Using a different wire gauge will not produce a reliable connection."},{"question":"What is the pitch of connector 3-643821-3?","answer":"The pitch is 0.156\" (3.96mm), which matches the MTA-156 header pin row spacing for the board footprint."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"isd-matrix-langgraph","citationUrl":"https://icsourcedirect.com/te-connectivity-amp-connectors/3-643821-3","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/te-connectivity-amp-connectors/3-643821-3 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}}