{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LTC1643ALCGN#PBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LTC1643ALCGN~4PBF","canonicalUrl":"https://icboms.com/analog-devices/LTC1643ALCGN~4PBF","factsUrl":"https://icboms.com/api/mcp/products/LTC1643ALCGN%23PBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LTC1643ALCGN#PBF Hot Swap Controller, 4-channel, 16-SSOP (0.154\", 3.90mm Width), Surface Mount, Tube, 3.3V/5V/±12V supply, 200mA/500mA output.","salesMarkdown":"## Four-rail hot swap for CompactPCI backplanes The LTC1643ALCGN#PBF is a 4-channel Hot Swap Controller from Analog Devices, purpose-built for CompactPCI card insertion into a live backplane. It manages the inrush on the 3.3V, 5V, and ±12V rails simultaneously, with the internal pass FETs handling both the turn-on slew rate and fault isolation on each channel. Each of the four channels is independently programmable for current limit, fault timeout, and output slew rate via external passives, so you can tune the ramp-up to match the bulk capacitance on each rail without tripping the upstream supply. ## Per-rail current rating and what it means at the bench The output current rating is split: 200 mA on the 3.3V and 5V channels, and 500 mA on the ±12V channels. That 500 mA on the ±12V rails is the one that catches people — a CompactPCI card drawing 300 mA on +12V is fine, but if the downstream regulator on the card has a high inrush cap, the fault-timeout programming needs to account for the longer ramp. The latched-fault behaviour means once a channel hits the current limit and times out, it stays off until the UVLO reset or the power is cycled — no auto-retry. That is deliberate for backplane safety: a shorted card does not keep hammering the bus. If the backplane lives in an outdoor cabinet or an unventilated enclosure, the industrial-temperature sibling LTC4244IGN#PBF (-40°C to 85°C) is the one to reach for. ## Package, footprint, and the scorch-mark test The 16-SSOP (0.154\" body width, 3.90 mm) is a standard fine-pitch SOIC variant. The 0.025\" lead pitch means a standard SSOP-16 land pattern works; no exotic pad geometry. The supplier device package is the same 16-SSOP, so no confusion between body widths. Surface-mount only — no through-hole option. If you are reworking a CompactPCI card that has a blown hot-swap controller, the scorch mark on the board usually points to the FET side, not the controller itself. But when the controller does fail, the latched-fault behaviour means the card will not power up at all, which is a clean failure signature to diagnose. ROHS3 compliant, so it passes the current EU material restrictions without an exemption. No AEC-Q automotive qualification; this is a commercial/industrial part.","metaTitle":"LTC1643ALCGN#PBF Hot Swap Controller, 4-Ch, 16-SSOP","metaDescription":"Analog Devices LTC1643ALCGN#PBF 4-channel Hot Swap Controller for CompactPCI. 3.3V/5V/±12V supply, 200mA/500mA output. Active, ROHS3. Order via RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Type":"Hot Swap Controller","Package":"Tube","Features":"Latched Fault, Thermal Limit, UVLO","Applications":"CompactPCI™","Mounting Type":"Surface Mount","Package / Case":"16-SSOP (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Voltage - Supply":"3.3V, 5V, ±12V","Internal Switch(s)":"Both","Number of Channels":"4","Operating Temperature":"0°C ~ 70°C","Programmable Features":"Current Limit, Fault Timeout, Slew Rate","Current - Output (Max)":"200mA, 500mA","Supplier Device Package":"16-SSOP"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$11.29","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$11.29000","currency":"USD"},{"qty":10,"price":"$10.37200","currency":"USD"},{"qty":25,"price":"$9.94240","currency":"USD"},{"qty":100,"price":"$8.75990","currency":"USD"},{"qty":250,"price":"$8.33000","currency":"USD"},{"qty":500,"price":"$7.79260","currency":"USD"},{"qty":1000,"price":"$7.60500","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"Will LTC1643ALCGN#PBF drop into a board that was specified around LTC1643AL-1CGN#PBF without rewiring?","answer":"Yes, the LTC1643ALCGN#PBF and LTC1643AL-1CGN#PBF share the same package (16-SSOP), channel count (4), supply voltage range (3.3V/5V/±12V), and programmable features. The primary difference is the output current rating on the ±12V channels — the LTC1643AL-1CGN#PBF is limited to 200 mA on all four channels, while the LTC1643ALCGN#PBF delivers 500 mA on the ±12V rails. If your board draws more than 200 mA on the ±12V rails, the LTC1643ALCGN#PBF is the correct fit; otherwise, the swap is pin-compatible."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LTC1643ALCGN~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/LTC1643ALCGN~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}}