{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE33CA","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"1.5KE33CA","canonicalUrl":"https://icboms.com/stmicroelectronics/1.5KE33CA","factsUrl":"https://icboms.com/api/mcp/products/1.5KE33CA","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics 1.5KE33CA TRANSIL™ bidirectional TVS diode, 1500W peak pulse power, 28.2V reverse standoff, 31.4V breakdown, DO-201AA axial package, through-hole mounting.","salesMarkdown":"## Bidirectional TVS for 28 V rails — 1500 W surge capacity The STMicroelectronics 1.5KE33CA is a bidirectional TRANSIL™ transient voltage suppressor designed to clamp overvoltage events on DC power rails and signal lines. Its 1500 W peak pulse power rating (10/1000 µs waveform) handles industrial surge requirements, while the 28.2 V reverse standoff voltage lets it sit on a 24 V nominal bus without conducting. The 31.4 V minimum breakdown voltage defines the threshold where clamping begins, and the maximum clamping voltage at 169 A peak pulse current is 59 V — the voltage the protected circuitry must survive. A single bidirectional device replaces two unidirectional TVS diodes in antiparallel, saving board space and part count. ## Capacitance matters for signal integrity At 1 MHz the 1.5KE33CA presents 1350 pF of capacitance — typical for a 1500 W bidirectional TVS in this voltage class. On a high-speed data line this capacitance loads the bus and rounds edges; for 24 VDC power inputs, relay coils, or solenoid drives it is transparent. If the protected node carries a communication signal above 100 kHz, check the signal rise time against the RC time constant formed by the source impedance and this capacitance. ## Package and mounting — axial DO-201 The DO-201AA (DO-27) axial-lead package is a through-hole form factor suited for point-to-point wiring, terminal blocks, or PCB mounting with 0.9 mm diameter holes. The body is non-hermetic but the axial leads handle high surge currents without trace lift-off — a common choice for bulkhead-mounted transient protection in industrial and telecom equipment.","metaTitle":"1.5KE33CA STMicroelectronics Bidirectional TVS Diode, 1500W","metaDescription":"STMicroelectronics 1.5KE33CA bidirectional TVS diode, 1500W peak pulse power, 28.2V standoff, 31.4V breakdown. Available for RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"STMicroelectronics","Type":"Zener","Series":"1.5KE, TRANSIL™","Package":"Cut Tape (CT); Tape & Box (TB)","Applications":"General Purpose","Mounting Type":"Through Hole","Package / Case":"DO-201AA, DO-27, Axial","Product Status":"Active","lifecycle_stage":"eol_hot","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"1.5KE33","Operating Temperature":"-","Power Line Protection":"No","Bidirectional Channels":"1","Capacitance @ Frequency":"1350pF @ 1MHz","Supplier Device Package":"DO-201","Voltage - Breakdown (Min)":"31.4V","Voltage - Clamping (Max) @ Ipp":"59V","Voltage - Reverse Standoff (Typ)":"28.2V","Current - Peak Pulse (10/1000µs)":"169A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.9400","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/572f99690aeb2b0f302ed9cdcfd976ec.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/1.5KE33CA/alternatives.json"},"ai":{"faq":[{"question":"Is 1.5KE33CA bidirectional?","answer":"Yes, the 1.5KE33CA is a single bidirectional channel. It clamps both positive and negative transients symmetrically, so polarity does not matter during installation — either lead can connect to the protected rail."},{"question":"What is the difference between 1.5KE33CA and 1.5KE33A?","answer":"The 'C' in the suffix indicates bidirectional clamping; the 'A' suffix (without 'C') denotes a unidirectional device. The 1.5KE33A protects only one polarity and has an anode/cathode orientation, while the 1.5KE33CA clamps both polarities and is polarity-insensitive. Breakdown and standoff voltages are the same between the two."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/1.5KE33CA","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/1.5KE33CA 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}}