{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SMAJ4733CE3/TR13","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"SMAJ4733CE3-TR13","canonicalUrl":"https://icboms.com/microchip/SMAJ4733CE3-TR13","factsUrl":"https://icboms.com/api/mcp/products/SMAJ4733CE3%2FTR13","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology Zener Diode, SMAJ4733CE3/TR13, 5.1 V, 2 W, ±2% Tolerance, DO-214AC (SMA) Surface Mount, Tape & Reel.","salesMarkdown":"## 5.1 V regulation at 2 W — the thermal budget and the load The SMAJ4733CE3/TR13 is a 5.1 V Zener diode in a DO-214AC (SMA) surface-mount package, rated for 2 W continuous power dissipation. That 2 W ceiling sets the practical current limit: at 5.1 V, the diode can sink roughly 392 mA before the junction hits its thermal limit at 150 °C ambient — but the actual derating depends on the PCB copper area under the cathode tab, which is the primary heat path in the SMA package. The ±2% tolerance on the nominal 5.1 V means the actual Zener voltage falls between 4.998 V and 5.202 V across the operating temperature range of -55 °C to 150 °C. For a 5 V rail clamp or a reference shunt, that band is tight enough to keep the load within spec without a separate trim resistor. ## Impedance and leakage — what the bench sees Maximum Zener impedance (Zzt) is 7 Ohms at the test current. That figure governs how much the Zener voltage shifts when the load current varies: a 10 mA change in current through the diode shifts the voltage by 70 mV worst-case. For a simple shunt regulator feeding a low-power MCU or a comparator reference, that ripple is usually acceptable — but it matters if the load steps hard. Reverse leakage is 10 µA max at 1 V reverse bias. In a battery-powered circuit that idles at 1 µA system draw, that 10 µA leak from the Zener alone dominates the sleep budget — you would need a series switch or a higher-voltage Zener to keep the quiescent current down. Forward voltage drop is 1.2 V max at 200 mA forward current. If the diode is used in a bidirectional clamp (back-to-back Zeners), the forward drop adds to the clamp threshold on one polarity. ## Active production — no lifecycle risk for new builds The base product number is SMAJ473, which covers the whole family of 2 W Zener diodes in the DO-214AC package. The CE3 suffix indicates the ±2% tolerance grade and the /TR13 suffix denotes Tape & Reel packaging for automated pick-and-place assembly.","metaTitle":"Microchip SMAJ4733CE3/TR13 Zener Diode, 5.1 V, 2 W, DO-214AC","metaDescription":"Microchip SMAJ4733CE3/TR13 Zener diode, 5.1 V nominal, 2 W, ±2% tolerance, DO-214AC (SMA) surface mount. Active production, sourced per RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"Microchip Technology","Series":"-","Package":"Tape & Reel (TR)","Tolerance":"±2%","Power - Max":"2 W","Mounting Type":"Surface Mount","Package / Case":"DO-214AC, SMA","Product Status":"Active","lifecycle_stage":"eol_hot","Base Product Number":"SMAJ473","Impedance (Max) (Zzt)":"7 Ohms","Operating Temperature":"-55°C~150°C","Supplier Device Package":"DO-214AC","Voltage - Zener (Nom) (Vz)":"5.1 V","Current - Reverse Leakage @ Vr":"10 µA @ 1 V","Voltage - Forward (Vf) (Max) @ If":"1.2 V @ 200 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6150","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/ebad8f820d8ea0d9e07e6ed7b505adea.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What does the ±2% tolerance mean for my 5 V rail?","answer":"The 5.1 V nominal Zener voltage will measure between 4.998 V and 5.202 V at the test current and 25 °C. For a rough clamp or a non-critical reference, that is fine — for a precision reference, you would want a lower-tolerance part or a bandgap reference."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/SMAJ4733CE3-TR13","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/SMAJ4733CE3-TR13 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}}