{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N4742P/TR12","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"1N4742P-TR12","canonicalUrl":"https://icboms.com/microchip/1N4742P-TR12","factsUrl":"https://icboms.com/api/mcp/products/1N4742P%2FTR12","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology 1N4742P/TR12 Zener diode, 12 V, 1 W, ±10% tolerance, DO-204AL (DO-41) axial, Tape & Reel.","salesMarkdown":"## Zener voltage and power — the two numbers that decide the slot The 1N4742P/TR12 is a 12 V Zener diode rated at 1 W maximum power dissipation in the standard DO-204AL (DO-41) axial-lead package from Microchip Technology. The 12 V nominal breakdown voltage, held within ±10%, sets the regulation point for shunt-clamp or reference circuits — a 12 V rail that needs to stay between 10.8 V and 13.2 V across the load range uses this part. With a 9 Ohm maximum Zzt impedance, the regulation voltage shifts about 9 mV per mA of Zener current change — significant if the load current varies widely, but fine for fixed-load or low-dynamic applications. ## Thermal and package — what the rework bench needs to know The DO-41 axial package is through-hole, which means it survives hot-air removal and hand-soldering without the risk of lifting a pad — a rework-friendly part. At 1 W maximum dissipation, the junction-to-ambient thermal resistance in free air is roughly 50-70 °C/W for a DO-41 with 0.4-inch lead length — so at 1 W the junction sits about 50-70 °C above ambient. Keep the leads short and the PCB copper area generous if running near the power limit. Tape & Reel packaging (the /TR suffix) means the part ships on a reel for automated insertion, but the through-hole axial body is equally happy in hand-assembly or repair work — the reel just saves pick-and-place setup time. ## Leakage and forward drop — the secondary specs that matter in bias circuits Reverse leakage is a maximum 5 µA at 9.1 V reverse voltage — well below the Zener knee, so standby power loss in a 12 V rail is negligible (about 45 µW per diode). This matters in battery-powered circuits where every microamp counts. Forward voltage drop is 1.2 V maximum at 200 mA forward current — the diode can be pressed into service as a general-purpose rectifier in a pinch, though the 1 W power limit restricts continuous forward current to about 800 mA peak.","metaTitle":"Microchip 1N4742P/TR12 Zener Diode, 12 V, 1 W, DO-41","metaDescription":"Microchip Technology 1N4742P/TR12 Zener diode, 12 V nominal, 1 W, ±10% tolerance, DO-204AL (DO-41) axial package. Active production. Quoted to order.","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":"±10%","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":"$1.7850","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f2579cdb7aec091d0b5f99df5459e04c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the tolerance of the 1N4742P/TR12 Zener voltage?","answer":"The Zener voltage tolerance is ±10%, so a 12 V nominal part will regulate between 10.8 V and 13.2 V at the specified test current."},{"question":"What package does the 1N4742P/TR12 come in?","answer":"It comes in the DO-204AL (DO-41) axial-lead through-hole package, supplied on Tape & Reel for automated assembly."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/1N4742P-TR12","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/1N4742P-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}}