{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"B03B-WPJRS-2(LF)(SN)","brand":"JST","brandSlug":"jst","productSlug":"B03B-WPJRS-2~1LF~2~1SN~2","canonicalUrl":"https://icsourcedirect.com/jst/B03B-WPJRS-2~1LF~2~1SN~2","factsUrl":"https://icsourcedirect.com/api/mcp/products/B03B-WPJRS-2(LF)(SN)","rawCanonicalId":null},"summary":{"shortDescription":"JST WPJ Series, Header, 3 Positions, 1 Row, 0.197\" (5.00mm) Pitch, Through Hole, Solder, Waterproof, Tin Contacts, Red PBT Housing","salesMarkdown":"## What This Connector Is and Where It Fits The JST B03B-WPJRS-2(LF)(SN) is a 3-position single-row header from the WPJ series, designed for board-to-cable/wire interconnects that need a sealed, vibration-resistant connection. It carries a 5.00 mm pitch, rated 7 A per circuit at 300 V, with tin-plated contacts on both the mating and solder sides. The housing is a red, glass-filled PBT rated UL94 V-0, and the connector is fully shrouded on all four walls with a latch holder for positive retention. The waterproof ingress protection makes this header suited for outdoor, washdown, or high-humidity environments where moisture would corrode an unsealed connector. The operating temperature range of -25°C to 85°C covers automotive cabin, industrial cabinet, and telecom enclosure conditions. ## Key Ratings and What They Mean for Your Build The 5.00 mm pitch gives enough room for the 300 V rating without forcing an oversized board footprint — it's a common spacing for power and signal in sealed harnesses. The 7 A per-contact rating is derated from the 85°C upper limit; if your enclosure runs hot, expect to drop current. The tin-plated contacts are rated for a moderate number of mating cycles — fine for field-service connections, but not for frequent reconnects in a test fixture. The latch holder locks the mated pair against vibration, so it won't shake loose on a moving assembly. The mated stacking height of 25.3 mm is set by the mating receptacle housing — the board-mount header's insulation height is 21.41 mm above the PCB surface, with a solder post length of 3.30 mm. The board guide feature helps align the connector during assembly, reducing the risk of bent pins. ## Mating and Termination This header mates with the JST WPJ series receptacle housing (crimp terminal style) — the latch holder on the header engages the matching lock on the receptacle. The through-hole solder termination is straightforward for wave or hand soldering. The square male pins accept the receptacle's female crimp terminals, which are ordered separately.","metaTitle":"JST WPJ B03B-WPJRS-2(LF)(SN) Header, 3-Pos 5.00mm","metaDescription":"JST WPJ series 3-position single-row header, 5.00mm pitch, 7A, 300V, waterproof IP-rated, shrouded with latch holder. Active production, sourced to order. RoHS.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Pin Headers, Sockets & Housings"],"specifications":{"Mfr":"JST Sales America Inc.","Style":"Board to Cable/Wire","Series":"WPJ","Package":"Bulk","Features":"Board Guide","Shrouding":"Shrouded - 4 Wall","Termination":"Solder","Applications":"-","Contact Type":"Male Pin","Contact Shape":"Square","Mounting Type":"Through Hole","Connector Type":"Header","Fastening Type":"Latch Holder","Number of Rows":"1","Pitch - Mating":"0.197\\\" (5.00mm)","Product Status":"Active","Voltage Rating":"300V","lifecycle_stage":"unknown","Contact Material":"Copper Alloy","Insulation Color":"Red","Insulation Height":"0.843\\\" (21.41mm)","Ingress Protection":"Waterproof","Base Product Number":"B03B-WPJ","Insulation Material":"Polybutylene Terephthalate (PBT), Glass Filled","Number of Positions":"3","Row Spacing - Mating":"-","Contact Finish - Post":"Tin","Contact Length - Post":"0.130\\\" (3.30mm)","Current Rating (Amps)":"7A","Operating Temperature":"-25°C ~ 85°C","Mated Stacking Heights":"25.3mm","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":"-","Contact Finish Thickness - Mating":"-"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.3352","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icsourcedirect.com/api/mcp/products/B03B-WPJRS-2(LF)(SN)/alternatives.json"},"ai":{"faq":[{"question":"What is the pitch of the JST B03B-WPJRS-2(LF)(SN) connector?","answer":"The pitch is 5.00 mm (0.197 inches), which is the center-to-center spacing between adjacent pins."},{"question":"Is the B03B-WPJRS-2(LF)(SN) RoHS compliant?","answer":"The part number suffix (LF) indicates lead-free / RoHS-compliant construction, consistent with JST's standard compliance for this series."},{"question":"What is the mating connector for the JST B03B-WPJRS-2(LF)(SN)?","answer":"It mates with the JST WPJ series receptacle housing that accepts crimp terminals. The latch holder on this header locks with the matching feature on the receptacle."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icsourcedirect.com/jst/B03B-WPJRS-2~1LF~2~1SN~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/jst/B03B-WPJRS-2~1LF~2~1SN~2 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:04:01.345Z","lastPublished":"2026-07-22T18:04:01.345Z","indexable":true}}