{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LTC1555LEGN#PBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LTC1555LEGN~4PBF","canonicalUrl":"https://icboms.com/analog-devices/LTC1555LEGN~4PBF","factsUrl":"https://icboms.com/api/mcp/products/LTC1555LEGN%23PBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LTC1555LEGN#PBF bidirectional voltage level translator, SIM card interface, thermal-shutdown protection, open-drain output, 16-SSOP package, bulk tube.","salesMarkdown":"## What the supply rails tell you about the interface The LTC1555LEGN#PBF is a single-circuit bidirectional voltage level translator purpose-built for SIM card interfaces. The VCCA side runs from 1.425 V to 4.4 V, which covers the 1.8 V signaling used by modern SIMs and the 3 V legacy cards. The open-drain output means the pull-up resistor lives off-chip on the VCCB side. The BOM needs to budget that resistor value based on the bus capacitance and the required rise time — the translator itself does not source current high. ## SIM card protection and thermal shutdown — not just a buffer The integrated SIM Card Interface handles the handshake sequence and level shifting for the clock, reset, and I/O lines. The thermal-shutdown protection kicks in if the output gets shorted or the part is asked to sink more current than the package can dissipate — a real risk when a SIM card is hot-plugged or the contact springs are dirty. An outdoor base-station controller or a factory-floor terminal that sees seasonal extremes will stay inside the envelope. ## Package and sourcing reality This is the tube (Bulk) variant of the LTC1555LEGN family. The die and the 16-SSOP package are identical to the tape-and-reel sibling LTC1555LEGN-1.8#TRPBF — the only difference is the shipping medium. If your pick-and-place line is set up for reels, order the -1.8#TRPBF; if you are hand-placing or reworking, the tube part is fine. No last-time-buy or end-of-life notice is on file.","metaTitle":"LTC1555LEGN#PBF Level Translator, SIM Card Interface","metaDescription":"Analog Devices LTC1555LEGN#PBF bidirectional voltage level translator with SIM card interface and thermal shutdown. Active production, 16-SSOP tube.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Bulk","Features":"SIM Card Interface, Thermal-Shutdown Protection","Output Type":"Open Drain","Channel Type":"Bidirectional","Mounting Type":"Surface Mount","Package / Case":"16-SSOP (0.154\\\", 3.90mm Width)","Voltage - VCCA":"1.425 V ~ 4.4 V","Voltage - VCCB":"2.6 V ~ 6 V","Translator Type":"Voltage Level","lifecycle_stage":"eol_hot","Number of Circuits":"1","Channels per Circuit":"1","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"16-SSOP"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$3.89","stockQuantity":0,"priceTiers":[{"qty":78,"price":"$3.89000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/c9204c6a79e3bbba29fd4d701d85bbbe.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the difference between LTC1555LEGN#PBF and LTC1555LEGN-1.8#TRPBF?","answer":"The die and the 16-SSOP package are identical. LTC1555LEGN#PBF ships in a tube (Bulk), while LTC1555LEGN-1.8#TRPBF ships on tape and reel. The -1.8# suffix indicates the VCCA supply voltage option is factory-trimmed for 1.8 V operation on the reel variant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LTC1555LEGN~4PBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/LTC1555LEGN~4PBF 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}}