{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LTC2928CUHF#PBF","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"LTC2928CUHFPBF","canonicalUrl":"https://icboms.com/analog-devices/LTC2928CUHFPBF","factsUrl":"https://icboms.com/api/mcp/products/LTC2928CUHF%23PBF","rawCanonicalId":null},"summary":{"shortDescription":"Analog Devices LTC2928CUHF#PBF, Type Sequencer, Reset Active Low, 4 Voltages Monitored, Reset Timeout 5ms Minimum, 38-WFQFN Exposed Pad, Surface Mount, 0°C ~ 70°C.","salesMarkdown":"## Four-rail power sequencer for controlled start-up The LTC2928CUHF#PBF is a four-channel power supply sequencer from Analog Devices that manages the turn-on and turn-off order of up to four independent voltage rails. It monitors each rail against an adjustable threshold and asserts an active-low reset signal when any rail falls outside the programmed window. The 5 ms minimum reset timeout gives downstream logic a clean power-good window before the system starts. This part is built for controlled start-up sequencing in multi-rail systems — think server motherboards, base stations, or industrial controllers where the FPGA core must come up before the I/O banks. ## What the ratings mean for the BOM Four monitored voltages means this single 38-QFN replaces what used to take a handful of reset ICs and a CPLD. The adjustable threshold per channel lets you set each rail's trip point independently — no fixed-voltage variants to stock. The active-low reset output matches the majority of FPGA and processor reset inputs, so no external inverter is needed. The commercial temperature range (0°C to 70°C) limits it to indoor, conditioned environments; if the board sees an engine bay or a rooftop cabinet, you will need the industrial-grade version. ## Package and mounting Housed in a 38-lead WFQFN with an exposed pad (5x7 mm body). The pad must be soldered to a thermal land on the PCB — it is the primary heat path and also ties to the ground plane. Reflow soldering is the intended assembly method; hand-soldering a QFN on site is possible with a hot-air station and a steady hand, but it is not a field-swap part like a DIP or an SOIC. The tube shipping medium is fine for prototype builds; for production, order the tape-and-reel variant if your pick-and-place needs it. ## Active production — no LTB risk The LTC2928CUHF#PBF is listed as Active and ROHS3 compliant. No end-of-life notice, no last-time-buy window to track. For a BOM freeze or a long-production-run design, this part is safe to qualify now. If you are looking for a second-source option, the ADM1186-2ARQZ is a functional peer — same sequencer type, same 4-channel count, but its reset is active high and its operating temperature range extends to -40°C to 85°C. That wider temperature grade makes the ADM1186 a better fit for outdoor or industrial builds, but the polarity difference means a board spin if you swap directly.","metaTitle":"LTC2928CUHF#PBF Power Supply Sequencer, 4-Channel, 38-QFN","metaDescription":"LTC2928CUHF#PBF is an active 4-channel power supply sequencer from Analog Devices. Active-low reset, 5ms min timeout, 0°C to 70°C range.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Type":"Sequencer","Reset":"Active Low","Package":"Tube","Mounting Type":"Surface Mount","Reset Timeout":"5ms Minimum","Package / Case":"38-WFQFN Exposed Pad","lifecycle_stage":"eol_hot","Voltage - Threshold":"Adjustable/Selectable","Operating Temperature":"0°C ~ 70°C (TA)","Supplier Device Package":"38-QFN (5x7)","Number of Voltages Monitored":"4"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$11.91","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$11.91000","currency":"USD"},{"qty":10,"price":"$10.75700","currency":"USD"},{"qty":25,"price":"$10.25640","currency":"USD"},{"qty":100,"price":"$8.90570","currency":"USD"},{"qty":250,"price":"$8.50544","currency":"USD"},{"qty":500,"price":"$7.75496","currency":"USD"},{"qty":1000,"price":"$7.08000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/497b611aee40cb95c4183d70cfe608f3.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is LTC2928CUHF#PBF used for?","answer":"It is a four-channel power supply sequencer that controls the order in which multiple voltage rails turn on and off. Typical applications include multi-rail systems such as server motherboards, telecom base stations, and industrial controllers where an FPGA or processor requires a specific power-up sequence."},{"question":"What is the closest functional second-source for LTC2928CUHF#PBF?","answer":"The ADM1186-2ARQZ is a functional peer — same sequencer type and 4-channel count. However, its reset is active high (the LTC2928 is active low) and its operating temperature range is -40°C to 85°C, so a direct drop-in swap requires checking the reset polarity and thermal environment."},{"question":"How do you sequence power supplies with LTC2928?","answer":"Each of the four channels monitors a voltage rail through an external resistor divider that sets the threshold. When all rails are within tolerance, the active-low reset output de-asserts. The 5 ms minimum reset timeout provides a clean power-good signal to the system controller. The adjustable thresholds let you set each rail's trip point independently."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/LTC2928CUHFPBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/LTC2928CUHFPBF 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}}