{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N4742AP/TR8","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"1N4742AP-TR8","canonicalUrl":"https://icboms.com/microchip/1N4742AP-TR8","factsUrl":"https://icboms.com/api/mcp/products/1N4742AP%2FTR8","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology 1N4742AP/TR8 Zener Diode, 12 V Nominal, 1 W, ±5% Tolerance, DO-204AL (DO-41) Axial Package, Tape & Reel.","salesMarkdown":"## 12 V regulation, 1 W dissipation — the sizing numbers The 1N4742AP/TR8 is a 12 V zener diode from Microchip Technology, rated for 1 W continuous power dissipation in the standard DO-204AL (DO-41) axial-lead package. The ±5% tolerance on the nominal voltage means a 12 V part regulates between 11.4 V and 12.6 V at the test current — tight enough for most bias supply and voltage reference circuits. Maximum impedance (Zzt) is 9 Ohms at the zener test current. A lower impedance means tighter regulation as the bias current varies; 9 Ohms is typical for a 1 W, 12 V device and keeps the voltage shift under 100 mV for a 10 mA change in current. ## Thermal and leakage — what the ratings mean on the bench At 150°C junction temperature the 1 W power rating must be derated — the DO-41 package's thermal resistance to ambient is roughly 100°C/W, so at 25°C ambient the full 1 W is available, but at 85°C ambient the allowable dissipation drops to about 650 mW. Reverse leakage is specified at 5 µA maximum with 9.1 V applied across the junction — well below the 12 V breakdown knee. This low leakage means the diode draws negligible current in the off state, important for battery-powered bias circuits or high-impedance voltage references. Forward voltage is 1.2 V maximum at 200 mA forward current. If the diode is used in a bidirectional clamping or protection circuit, this forward drop adds to the clamping threshold.","metaTitle":"1N4742AP/TR8 Zener Diode, 12 V, 1 W, DO-41, Active","metaDescription":"Microchip Technology 1N4742AP/TR8 zener diode, 12 V nominal, 1 W, ±5%, DO-204AL (DO-41) axial lead. Active production, sourced to order. RFQ for volume pricing.","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) Cut Tape (CT)","Tolerance":"±5%","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":"$1.6300","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/5f236ca5540da5bdb84674abb4a197c3.pdf","sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/1N4742AP-TR8","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/1N4742AP-TR8 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}}