{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE250ARL","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"1.5KE250ARL","canonicalUrl":"https://icboms.com/stmicroelectronics/1.5KE250ARL","factsUrl":"https://icboms.com/api/mcp/products/1.5KE250ARL","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics 1.5KE250ARL, TRANSIL™ series, Zener TVS, 1500W peak pulse, 213V reverse standoff, 442V clamp, 23A (8/20µs), unidirectional, DO-201AA axial, through hole, obsolete.","salesMarkdown":"## What this TVS is and what it protects It delivers 1500W peak pulse power (10/1000µs waveform) with a reverse standoff voltage of 213V and a maximum clamping voltage of 442V at the rated peak pulse current of 23A (8/20µs waveform). The single unidirectional channel means it protects one polarity — positive transients above the breakdown threshold are shunted to ground; reverse polarity is not clamped. The 1.5KE250ARL is listed as obsolete. STMicroelectronics no longer manufactures this exact suffix variant. The good news: the 1.5KE series is a mature, widely cloned TVS family, and the 1.5KE250A (without the R or L suffix) is a common pin-compatible alternative from multiple manufacturers — same DO-201 package, same 213V standoff, same 1500W rating. When sourcing, confirm the breakdown voltage window (237V minimum) and clamping voltage (442V maximum) match, and verify the unidirectional polarity marking — the cathode band should be present on the body. This part comes in a DO-201AA (DO-27) axial-lead through-hole package. The body is about 9.5 mm long with 0.96 mm diameter leads — standard for the 1.5 kW class. Mounting is straightforward: through-hole into a board with 1.2 mm drilled holes, or you can solder the leads directly to a terminal. The axial leads are tinned and solderable with a standard iron or wave. No special thermal management needed for single-pulse transients; the lead frame and body handle the 1500W pulse within the rated waveform. If you are replacing a failed part on a board, the scorch mark around the body is usually obvious — the part fails shorted, which takes down the rail. A visual check for a cracked or bulged epoxy body confirms it. ## Capacitance and frequency considerations The 1.5KE250ARL has a typical capacitance of 560 pF at 1 MHz. That matters if you are protecting a high-speed data line — 560 pF will load the signal and roll off the edge rate above a few MHz. For a 213V rail, that is not usually a concern; this part is meant for DC power buses, not Ethernet or USB. If you need to protect a faster interface at a lower voltage, look at a lower-capacitance TVS array (e.g., the STMicroelectronics ESDA series). But for a 48V telecom bus or a 170V DC link, 560 pF is negligible.","metaTitle":"STMicroelectronics 1.5KE250ARL Zener TVS, 1500W, DO-201","metaDescription":"STMicroelectronics 1.5KE250ARL unidirectional Zener TVS diode, 1500W peak pulse, 213V standoff, 442V clamp. DO-201 axial package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"STMicroelectronics","Type":"Zener","Series":"1.5KE, TRANSIL™","Package":"Tape & Reel (TR)","Applications":"General Purpose","Mounting Type":"Through Hole","Package / Case":"DO-201AA, DO-27, Axial","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"1.5KE","Operating Temperature":"-","Power Line Protection":"No","Capacitance @ Frequency":"560pF @ 1MHz","Supplier Device Package":"DO-201","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"237V","Voltage - Clamping (Max) @ Ipp":"442V","Voltage - Reverse Standoff (Typ)":"213V","Current - Peak Pulse (10/1000µs)":"23A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.0300","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/089e26c8bbf5e28593f663899fc6cea1.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1.5KE250ARL/alternatives.json"},"ai":{"faq":[{"question":"What is the replacement for 1.5KE250ARL?","answer":"The direct functional replacement is the 1.5KE250A from STMicroelectronics or any major TVS manufacturer (e.g., Littelfuse, Vishay, ON Semiconductor). It shares the same DO-201 package, 213V standoff, 237V breakdown, 442V clamp, and 1500W peak pulse rating. The original 'R' and 'L' suffixes indicate reel packaging and lead form, not a different die. Verify unidirectional polarity (cathode band) when substituting."},{"question":"What is the polarity of 1.5KE250ARL?","answer":"It is unidirectional — one channel with a cathode band on the body. It clamps positive transients above the breakdown voltage; reverse polarity is not protected."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/1.5KE250ARL","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/1.5KE250ARL when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-16T14:45:15.026Z","lastPublished":"2026-07-16T14:45:15.026Z","indexable":true}}