{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE27A-E3/51","brand":"Vishay General Semiconductor - Diodes Division","brandSlug":"vishay-general-semiconductor-diodes-division","productSlug":"1.5KE27A-E3-51","canonicalUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5KE27A-E3-51","factsUrl":"https://icboms.com/api/mcp/products/1.5KE27A-E3%2F51","rawCanonicalId":null},"summary":{"shortDescription":"Vishay General Semiconductor - Diodes Division, TransZorb® series, Zener TVS diode, 1.5KE27A-/51, 1500W peak pulse, 23.1V reverse standoff, DO-201AA axial, bulk.","salesMarkdown":"## 1.5 kW Zener TVS for general-purpose transient clamping The 1.5KE27A-E3/51: Its 23.1 V reverse standoff voltage and 37.5 V clamping ceiling at 40 A peak pulse current make it a fit for 24 VDC rail protection in industrial control, power supplies, and telecom equipment — the clamping voltage sits comfortably below the typical 40 V abs-max of downstream DC-DC converters. Housed in a DO-201AA (DO-27) axial-lead package, it mounts through-hole on a PCB or terminal block — the axial body is common in point-of-use clamping where a radial or SMD part would need a separate heatsink pad. ## Voltage ratings and clamping behaviour Three voltage thresholds define the protection window: reverse standoff at 23.1 V (the DC bus it rides on without conducting), breakdown at 25.7 V minimum (where avalanche starts), and clamping at 37.5 V maximum (the voltage the load sees during a surge). A 24 V nominal rail with 10 % tolerance sits at 26.4 V — above the standoff but below the breakdown knee, so the diode stays off during normal ripple and only clamps on transients. The 40 A peak pulse current rating (10/1000 µs) is the surge capacity at the clamping voltage — multiply 40 A × 37.5 V to get the 1500 W peak power the device absorbs without failing. For shorter pulses (8/20 µs waveform) the peak current capability is higher, but the datasheet's 10/1000 µs rating is the conservative design-in number. ## Obsolete — sourcing through independent channels For new designs, a functionally equivalent TVS in the same 1.5 kW, 24 V class from Vishay or a competitor (e.g., Littlefuse, Bourns) would require a pin-for-pin comparison of the DO-201AA footprint and the clamping voltage window — no direct drop-in replacement is documented here.","metaTitle":"1.5KE27A-E3/51 Vishay TransZorb TVS, 1.5kW, 23.1V","metaDescription":"1.5KE27A-E3/51 Vishay TransZorb Zener TVS diode, 1500W peak pulse, 23.1V reverse standoff, DO-201AA. Obsolete — sourced to order via RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Vishay General Semiconductor - Diodes Division","Type":"Zener","Series":"TransZorb®","Package":"Bulk","Applications":"General Purpose","Mounting Type":"Through Hole","Package / Case":"DO-201AA, DO-27, Axial","Product Status":"Last Time Buy","lifecycle_stage":"unknown","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"1.5KE27","Operating Temperature":"-55°C~175°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"1.5KE","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"25.7V","Voltage - Clamping (Max) @ Ipp":"37.5V","Voltage - Reverse Standoff (Typ)":"23.1V","Current - Peak Pulse (10/1000µs)":"40A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.0800","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/cbd949ebcf4c95d5b4ea8fdecf87536f.pdf","sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/vishay-general-semiconductor-diodes-division/1.5KE27A-E3-51","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/vishay-general-semiconductor-diodes-division/1.5KE27A-E3-51 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:34:45.345Z","lastPublished":"2026-07-20T14:34:45.345Z","indexable":true}}