{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"PTZTFTE254.3B","brand":"ROHM Semiconductor","brandSlug":"rohm","productSlug":"PTZTFTE254.3B","canonicalUrl":"https://icboms.com/rohm/PTZTFTE254.3B","factsUrl":"https://icboms.com/api/mcp/products/PTZTFTE254.3B","rawCanonicalId":null},"summary":{"shortDescription":"ROHM Semiconductor PTZTFTE254.3B, Automotive AEC-Q101 zener diode, 4.55 V nominal, 1 W, ±5.49% tolerance, DO-214AC SMA, surface mount.","salesMarkdown":"## AEC-Q101 qualification and what it means for the rail The PTZTFTE254.3B: Nominal zener voltage is 4.55 V with a ±5.49% tolerance — the regulation window spans roughly 4.30 V to 4.80 V, which is tight enough to clamp a 5 V rail without pulling it below the downstream IC's undervoltage lockout threshold. ## Power handling and package fit Rated 1 W continuous power dissipation — at 4.55 V that allows about 220 mA steady-state shunt current before the junction hits the 150 °C limit. The actual derating depends on the PCB copper area under the DO-214AC (SMA) cathode tab; a standard 25 mm² pad keeps the thermal resistance in check. Supplier device package is PMDS — ROHM's internal code for the SMA footprint. The land pattern matches the industry-standard DO-214AC solder pad, so no footprint adjustment is needed when swapping between ROHM and other SMA zener sources. ROHS3 compliant — no restricted substances above the threshold limits, no exemption expiry clock to track for EU or UKCA market entry.","metaTitle":"ROHM PTZTFTE254.3B Zener Diode, 4.55 V, 1 W, DO-214AC","metaDescription":"ROHM PTZTFTE254.3B automotive AEC-Q101 zener diode, 4.55 V nom, 1 W, DO-214AC SMA. Active production, ROHS3. Quoted to order.","metaKeywords":null},"attributes":{"series":"Automotive, AEC-Q101","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Series":"Automotive, AEC-Q101","Package":"Tape & Reel (TR); Cut Tape (CT)","Tolerance":"±5.49%","Power - Max":"1 W","Mounting Type":"Surface Mount","Package / Case":"DO-214AC, SMA","lifecycle_stage":"eol_hot","Impedance (Max) (Zzt)":"15 Ohms","Operating Temperature":"150°C (TJ)","Supplier Device Package":"PMDS","Voltage - Zener (Nom) (Vz)":"4.55 V","Current - Reverse Leakage @ Vr":"20 µA @ 1 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.64","priceTiers":[{"qty":1,"price":"$0.64000","currency":"USD"},{"qty":10,"price":"$0.54600","currency":"USD"},{"qty":100,"price":"$0.40750","currency":"USD"},{"qty":500,"price":"$0.32014","currency":"USD"},{"qty":1500,"price":"$0.24739","currency":"USD"},{"qty":3000,"price":"$0.22556","currency":"USD"},{"qty":7500,"price":"$0.21100","currency":"USD"},{"qty":10500,"price":"$0.20400","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/f3bb8df0d218acae58cd52e0b60dcd78.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/PTZTFTE254.3B/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/rohm/PTZTFTE254.3B","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/rohm/PTZTFTE254.3B 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}}