{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N4742CP/TR12","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"1N4742CP-TR12","canonicalUrl":"https://icboms.com/microchip/1N4742CP-TR12","factsUrl":"https://icboms.com/api/mcp/products/1N4742CP%2FTR12","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology Zener Diode, 1N4742CP/TR12, 12 V, 1 W, ±2%, DO-204AL (DO-41) Axial, Tape & Reel.","salesMarkdown":"## 12 V rail clamp with 1 W dissipation headroom The 1N4742CP/TR12 is a 12 V Zener diode in the standard DO-41 axial-lead package, rated for 1 W continuous power dissipation. That 1 W ceiling means at the nominal 12 V knee the diode can sink about 83 mA before the junction temperature starts climbing past the safe operating area — plenty for a simple shunt regulator or a rail clamp on a low-power supply. The ±2% tolerance on the Zener voltage is tighter than the generic ±5% grade you often see on 1N4742 parts; if your BOM calls for a 12 V reference with a known spread, this variant gives you a narrower window without moving to a three-terminal reference IC. ## Thermal and leakage profile for the repair bench The 9 Ω maximum Zener impedance is the dynamic resistance at the test current — a higher impedance means the regulation voltage shifts more with load current, so for a precision 12 V rail you want to bias the diode at the current where the datasheet curve flattens. Reverse leakage is specified at 5 µA max with 9.1 V applied across the junction. That low leakage means the diode won't load down a high-impedance bias string until it actually breaks over, which is exactly what you want in a voltage-sensing or overvoltage-protection circuit. ## Active production — no EOL scramble There is no end-of-life notice or last-time-buy clock running; this part is still a standard catalog item.","metaTitle":"Microchip Technology 1N4742CP/TR12 Zener Diode, 12V, 1W","metaDescription":"Microchip Technology 1N4742CP/TR12 Zener diode, 12V nominal, 1W, ±2% tolerance, DO-41 axial package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"Microchip Technology","Series":"-","Package":"Tape & Reel (TR)","Tolerance":"±2%","Power - Max":"1 W","Mounting Type":"Through Hole","Package / Case":"DO-204AL, DO-41, Axial","Product Status":"Active","lifecycle_stage":"eol_hot","Base Product Number":"1N4742","Impedance (Max) (Zzt)":"9 Ohms","Operating Temperature":"-65°C~150°C","Supplier Device Package":"DO-204AL (DO-41)","Voltage - Zener (Nom) (Vz)":"12 V","Current - Reverse Leakage @ Vr":"5 µA @ 9.1 V","Voltage - Forward (Vf) (Max) @ If":"1.2 V @ 200 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.1900","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f2579cdb7aec091d0b5f99df5459e04c.pdf","sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/1N4742CP-TR12","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/1N4742CP-TR12 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}