{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1N751A-1E3","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"1N751A-1E3","canonicalUrl":"https://icboms.com/microchip/1N751A-1E3","factsUrl":"https://icboms.com/api/mcp/products/1N751A-1E3","rawCanonicalId":null},"summary":{"shortDescription":"Microchip / 1N751A-1E3, Zener Diode, 5.1 V nominal, 500 mW, ±5% tolerance, DO-204AH (DO-35) axial, Through Hole, -65°C to 175°C.","salesMarkdown":"The 1N751A-1E3 is a 5.1 V zener diode in a DO-35 axial-lead package, rated for 500 mW maximum power dissipation. The ±5% tolerance on the zener voltage means the actual Vz across a production batch will fall between about 4.85 V and 5.36 V — tight enough for most reference and clamping roles, but not a precision voltage reference. The 14 Ω maximum impedance (Zzt) at the test current tells you the dynamic resistance; in a shunt regulator circuit that impedance adds to the output resistance, so budget for a few tens of millivolts of load-regulation error if the current varies. ## Temperature range and environment The 175°C upper limit is unusual for a small-signal zener — most 500 mW devices stop at 150°C. That extra headroom matters when the diode is mounted near a hot power stage or in a sealed module with limited convection. Derate the 500 mW maximum linearly above 25°C; at 175°C the allowable dissipation drops to zero. ## Package and mounting (not tape-and-reel) in the DO-204AH / DO-35 axial-lead package. The through-hole body is 0.018 inch diameter leads on 0.200 inch lead spacing — standard for hand-insertion or wave-solder assembly. No moisture sensitivity level to track; no bake required before reflow because there is no reflow. The axial format is a common footprint shared with other DO-35 zeners, so a board laid out for a 1N751 or 1N752 will accept this part without a layout change. ## Lifecycle and compliance The 1N751A-1E3 is the lead-free / RoHS-compliant variant of the classic 1N751A; if your BOM still calls out the tin-lead version, this is the drop-in replacement that meets current environmental requirements.","metaTitle":"1N751A-1E3 Zener Diode, 5.1 V, 500 mW, DO-35, ±5%","metaDescription":"1N751A-1E3 5.1 V zener diode in DO-35 axial package, 500 mW power dissipation, ±5% tolerance, -65°C to 175°C range.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Signal Isolation"],"specifications":{"Package":"Bulk","Tolerance":"±5%","Power - Max":"500 mW","Mounting Type":"Through Hole","Package / Case":"DO-204AH, DO-35, Axial","lifecycle_stage":"eol_hot","Impedance (Max) (Zzt)":"14 Ohms","Operating Temperature":"-65°C ~ 175°C (TJ)","Supplier Device Package":"DO-35 (DO-204AH)","Voltage - Zener (Nom) (Vz)":"5.1 V","Current - Reverse Leakage @ Vr":"5 µA @ 2 V","Voltage - Forward (Vf) (Max) @ If":"1.1 V @ 200 mA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.21","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$2.21000","currency":"USD"},{"qty":100,"price":"$2.05000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/6d98779aa8949dce03bf707e4821c9ef.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to the 1N751A-1E3?","answer":"Any standard 5.1 V, 500 mW zener in a DO-35 package with ±5% tolerance is a functional equivalent — for example, the 1N751A (non-RoHS) or the BZX55C5V1. The 1N751A-1E3 differs only in its ROHS3 compliance; the electrical ratings are identical to the standard 1N751A."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/1N751A-1E3","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/1N751A-1E3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}