{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"KSD1691YS","brand":"onsemi","brandSlug":"onsemi","productSlug":"KSD1691YS","canonicalUrl":"https://icboms.com/onsemi/KSD1691YS","factsUrl":"https://icboms.com/api/mcp/products/KSD1691YS","rawCanonicalId":null},"summary":{"shortDescription":"onsemi KSD1691YS NPN power transistor, TO-225AA / TO-126-3 through-hole package, 5 A collector current, 60 V VCEO, 1.3 W power dissipation, ROHS3 compliant.","salesMarkdown":"## NPN power transistor — 5 A, 60 V in TO-126 The KSD1691YS is an NPN silicon power transistor from onsemi, housed in a TO-225AA / TO-126-3 through-hole package. It is rated for a continuous collector current of 5 A and a collector-emitter breakdown voltage of 60 V, placing it in the medium-current, general-purpose switching class. ## Saturation voltage and conduction loss Maximum Vce(sat) is 300 mV at 200 mA base current and 2 A collector current. At this operating point the conduction loss is 0.6 W, leaving 0.7 W of the 1.3 W total power budget for switching losses and ambient temperature derating. The 150°C maximum junction temperature sets the thermal derating curve. In a 25°C ambient with the TO-126 package mounted on a minimal heatsink, the usable continuous collector current is limited by the junction-to-ambient thermal resistance, not the 5 A silicon rating. ## Active production and compliance The through-hole TO-126-3 package is suited for manual assembly and rework environments. The collector tab is electrically common with the centre pin — board layout must account for this when heatsinking or isolating the mounting surface.","metaTitle":"onsemi KSD1691YS NPN Power Transistor, 5 A, 60 V, TO-126","metaDescription":"onsemi KSD1691YS NPN power transistor, 5 A Ic, 60 V VCEO, 160 min hFE at 2 A. Active production, ROHS3 compliant. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Signal Isolation"],"specifications":{"Package":"Bulk","Power - Max":"1.3 W","Mounting Type":"Through Hole","Package / Case":"TO-225AA, TO-126-3","Transistor Type":"NPN","lifecycle_stage":"eol_hot","Operating Temperature":"150°C (TJ)","Supplier Device Package":"TO-126-3","Vce Saturation (Max) @ Ib, Ic":"300mV @ 200mA, 2A","Current - Collector (Ic) (Max)":"5 A","Current - Collector Cutoff (Max)":"10µA (ICBO)","DC Current Gain (hFE) (Min) @ Ic, Vce":"160 @ 2A, 1V","Voltage - Collector Emitter Breakdown (Max)":"60 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.7","stockQuantity":31,"priceTiers":[{"qty":1,"price":"$0.70000","currency":"USD"},{"qty":10,"price":"$0.60900","currency":"USD"},{"qty":100,"price":"$0.42180","currency":"USD"},{"qty":500,"price":"$0.35242","currency":"USD"},{"qty":1000,"price":"$0.29993","currency":"USD"},{"qty":2000,"price":"$0.26713","currency":"USD"},{"qty":5000,"price":"$0.25307","currency":"USD"},{"qty":10000,"price":"$0.23432","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/3646440550ffd2e44654c23f7833fd4e.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is KSD1691YS's listed power dissipation?","answer":"The maximum power dissipation is 1.3 W. This is the total power the TO-126 package can dissipate at 25°C case temperature before the junction reaches 150°C."},{"question":"What compliance documentation does onsemi provide for KSD1691YS?","answer":"The KSD1691YS is ROHS3 compliant. onsemi provides the standard RoHS certificate of compliance; no separate UL or IEC certification is listed in the product record."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/onsemi/KSD1691YS","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/onsemi/KSD1691YS when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}