{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SST39LF040-55-4C-NHE","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"SST39LF040-55-4C-NHE","canonicalUrl":"https://icboms.com/microchip/SST39LF040-55-4C-NHE","factsUrl":"https://icboms.com/api/mcp/products/SST39LF040-55-4C-NHE","rawCanonicalId":null},"summary":{"shortDescription":"Microchip SST39 MPF™ series, SST39LF040-55-4C-NHE, 4Mbit parallel Flash, 55 ns access time, 3V to 3.6V supply, 32-PLCC (J-Lead) surface-mount package, 0°C to 70°C operating temperature.","salesMarkdown":"## 55 ns parallel Flash in a 32-PLCC footprint The Microchip SST39LF040-55-4C-NHE is a 4Mbit parallel Flash memory from the SST39 MPF™ series, organized as 512K x 8 bits. The 20 µs word/page write cycle time suits firmware-update routines where the host processor manages the erase-and-write sequence. This is a commercial-temperature device (0°C to 70°C), intended for indoor, non-condensing environments like office equipment, industrial controllers, or test instrumentation. ## 55 ns access — timing margin on the bus The 55 ns access time is the spec that determines whether this part can keep up with your memory controller without wait states. At a 20 MHz bus clock (50 ns period), a 55 ns access leaves negative margin for a single-cycle read — you will need at least one wait state inserted. For a 16 MHz bus (62.5 ns period), the 55 ns access fits with about 7.5 ns of setup margin, which is tight but workable if the PCB trace delay is under 2 ns. Budget the access time against your controller's read-cycle timing, not just the clock frequency. The supply range of 3V to 3.6V means this part operates on a 3.3V rail, with no 5V tolerance on the I/O pins. If your system uses a 5V bus, you will need level translation or a different Flash variant. The 3.3V-only requirement is common for low-power embedded systems, but it rules out direct connection to legacy 5V logic families.","metaTitle":"Microchip SST39LF040-55-4C-NHE Parallel Flash, 55 ns","metaDescription":"Microchip SST39LF040-55-4C-NHE 4Mbit parallel Flash, 55 ns access, 3V-3.6V, 32-PLCC, 0°C to 70°C. Active lifecycle.","metaKeywords":null},"attributes":{"series":"SST39 MPF™","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Series":"SST39 MPF™","Package":"Tube","Technology":"FLASH","Access Time":"55 ns","Memory Size":"4Mbit","Memory Type":"Non-Volatile","Memory Format":"FLASH","Mounting Type":"Surface Mount","Package / Case":"32-LCC (J-Lead)","lifecycle_stage":"eol_hot","Memory Interface":"Parallel","Voltage - Supply":"3V ~ 3.6V","Memory Organization":"512K x 8","Operating Temperature":"0°C ~ 70°C (TA)","Supplier Device Package":"32-PLCC (11.43x13.97)","Write Cycle Time - Word, Page":"20µs"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.52","priceTiers":[{"qty":1,"price":"$2.52000","currency":"USD"},{"qty":25,"price":"$2.52000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/c12703952514c8e3a7005ba27b772dce.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SST39LF040-55-4C-NHE/alternatives.json"},"ai":{"faq":[{"question":"Is SST39LF040-55-4C-NHE obsolete?","answer":"Microchip continues to produce it, so there is no end-of-life pressure."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/SST39LF040-55-4C-NHE","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/SST39LF040-55-4C-NHE 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}}