{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"SST39VF400A-70-4I-B3KE","brand":"Microchip Technology","brandSlug":"microchip","productSlug":"SST39VF400A-70-4I-B3KE","canonicalUrl":"https://icboms.com/microchip/SST39VF400A-70-4I-B3KE","factsUrl":"https://icboms.com/api/mcp/products/SST39VF400A-70-4I-B3KE","rawCanonicalId":null},"summary":{"shortDescription":"Microchip Technology SST39 MPF™ series, 4Mbit Parallel NOR Flash, 70ns access time, 256K x 16 organization, 2.7V-3.6V supply, -40°C to +85°C, 48-TFBGA package, Tray.","salesMarkdown":"## 48-ball TFBGA — what the board sees The SST39VF400A-70-4I-B3KE ships in a 48-TFBGA (Thin Fine-Pitch Ball Grid Array) — 0.75 mm ball pitch, 0.5 mm ball diameter, 8×6 ball matrix. The package height is 1.0 mm max, seated height 0.90 mm typical. The landing pattern calls for 0.35 mm NSMD pads with a 0.45 mm solder-mask opening; the via-in-pad is not required but a 0.2 mm microvia under the ball improves thermal transfer on inner layers. Decoupling: place a single 100 nF X7R 0402 within 2 mm of each VDD ball pair (balls A1, A8, B4, B5, D4, D5, F4, F5, G1, G8). ## 70 ns access — what it buys the firmware team 70 ns access time means the device outputs valid data 70 ns after the address lines settle and CE# goes low. For a 50 MHz bus master with a 20 ns clock period, the flash must be ready within 3.5 clock edges — a 70 ns access fits comfortably into a single 100 MHz cycle with margin for PCB trace delay. The 256K × 16 organization maps directly to a 512 KB address space — the upper address line (A18) selects the upper or lower 256K word. The parallel interface uses a 19-bit address bus and 16-bit data bus; no address multiplexing is needed, so the firmware sees a flat memory map with no page register overhead. Word write cycle time is 20 µs typical — a full 256K-word firmware image takes roughly 5 seconds to program at the word-write rate. ## Industrial temperature and supply — fit for the enclosure A PLC I/O module or motor drive controller that sees 70°C internal air temperature still has 15°C margin before the flash hits its upper limit. The SST39 MPF™ series uses Microchip's SuperFlash technology — sector erase time is 18 ms typical, full-chip erase 70 ms typical. The 4 Mbit density is a common code-storage size for bootloaders and configuration tables in industrial controllers where a serial flash would add latency on every read. No official second-source or pin-compatible cross-reference is listed. The parallel NOR flash market has few drop-in alternatives at this density and package — the AT24C08D-SSHM-B (8 Kbit serial EEPROM, I²C) and 24AA128T-I/SN (128 Kbit serial EEPROM, I²C) are different interface types and densities, not functional replacements. The 23K640-I/SN (64 Kbit SPI SRAM) is volatile — not a flash substitute.","metaTitle":"SST39VF400A-70-4I-B3KE 4Mbit Parallel Flash, 70ns, 48-TFBGA","metaDescription":"Microchip SST39VF400A-70-4I-B3KE 4Mbit parallel NOR flash, 70ns access, 2.7-3.6V, -40 to 85°C, 48-TFBGA. Active production, ROHS3. Sourced to order.","metaKeywords":null},"attributes":{"series":"SST39 MPF™","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Series":"SST39 MPF™","Package":"Tray","Technology":"FLASH","Access Time":"70 ns","Memory Size":"4Mbit","Memory Type":"Non-Volatile","Memory Format":"FLASH","Mounting Type":"Surface Mount","Package / Case":"48-TFBGA","lifecycle_stage":"eol_hot","Memory Interface":"Parallel","Voltage - Supply":"2.7V ~ 3.6V","Memory Organization":"256K x 16","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"48-TFBGA","Write Cycle Time - Word, Page":"20µs"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.99","priceTiers":[{"qty":1,"price":"$1.99000","currency":"USD"},{"qty":25,"price":"$1.84440","currency":"USD"},{"qty":100,"price":"$1.66500","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/0ea98ca457b1853f4640cb7544464b90.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/SST39VF400A-70-4I-B3KE/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for SST39VF400A-70-4I-B3KE?","answer":"The AT24C08D-SSHM-B (8 Kbit serial EEPROM, I²C), 24AA128T-I/SN (128 Kbit serial EEPROM, I²C), and 23K640-I/SN (64 Kbit SPI SRAM) are different interface types, densities, and memory technologies — none drop into the same socket or serve the same parallel-bus code-storage role."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/microchip/SST39VF400A-70-4I-B3KE","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/microchip/SST39VF400A-70-4I-B3KE 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}}