{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5SMB91A","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5SMB91A","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5SMB91A","factsUrl":"https://icboms.com/api/mcp/products/1.5SMB91A","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. 1.5SMB series TVS Zener diode, order code 1.5SMB91A, unidirectional, 1500W peak pulse power, 77.8V reverse standoff, DO-214AA SMB package, tape and reel.","salesMarkdown":"## 1500 W peak pulse, 77.8 V standoff — the clamping decision The Littelfuse 1.5SMB91A is a unidirectional TVS Zener diode rated for 1500 W (1.5 kW) peak pulse power at the 10/1000 µs waveform, clamping at 125 V max with a 12.2 A peak pulse current. The 77.8 V reverse standoff means it sits across a 72 V or 75 V rail without conducting, then breaks down at 86.5 V min to shunt the surge. That 125 V clamp is what the downstream IC must survive — if the protected device's abs-max is 120 V, this part does not leave enough margin. One channel, unidirectional — polarity matters on the board. The cathode band on the DO-214AA body marks the protected rail side; reverse the orientation and the diode conducts at the forward voltage, not the Zener breakdown. No power-line protection rating here, so this is signal or DC bus, not mains. ## DO-214AA SMB — field-swappable with a standard iron Surface-mount DO-214AA (SMBJ) package, same footprint as the SMB case code. Two-terminal device with a visible cathode band — orientation is obvious even without a magnifier, which matters when you are swapping it on a live board in a telecom cabinet. No thermal pad, no exposed paddle; the junction-to-ambient thermal path runs through the solder pads and the copper pour area. A standard soldering iron or hot-air station handles the rework; no pre-bake required below MSL 1 unless the reel has been exposed to humidity. Operating temperature range -65 °C to 150 °C junction — wide enough for outdoor telecom enclosures that see both desert sun and winter nights. The 1500 W rating is derated above 25 °C per the datasheet curve; at 85 °C ambient the peak pulse power drops to roughly 75 % of the 25 °C value, so the actual surge-handling budget is about 1125 W in a warm cabinet.","metaTitle":"Littelfuse 1.5SMB91A TVS Diode, 1500W, 77.8V Standoff","metaDescription":"Littelfuse 1.5SMB91A unidirectional TVS Zener diode, 1500W peak pulse power, 77.8V reverse standoff, DO-214AA SMB. Active, sourced per RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Littelfuse Inc.","Type":"Zener","Series":"1.5SMB","Package":"Tape & Reel (TR)","Applications":"Telecom","Mounting Type":"Surface Mount","Package / Case":"DO-214AA, SMB","Product Status":"Active","lifecycle_stage":"unknown","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"1.5SMB","Operating Temperature":"-65°C~150°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"DO-214AA (SMBJ)","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"86.5V","Voltage - Clamping (Max) @ Ipp":"125V","Voltage - Reverse Standoff (Typ)":"77.8V","Current - Peak Pulse (10/1000µs)":"12.2A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.2415","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/81b90dfb07fef606df152b0bf1427329.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What package does the 1.5SMB91A come in?","answer":"The supplier device package is also listed as DO-214AA (SMBJ)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5SMB91A","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1.5SMB91A 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}}