{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"UC3844AN","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"UC3844AN","canonicalUrl":"https://icboms.com/stmicroelectronics/UC3844AN","factsUrl":"https://icboms.com/api/mcp/products/UC3844AN","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics UC3844AN, current-mode PWM controller, 8-DIP through-hole package, boost/flyback topology, switching frequency up to 500 kHz, 48% max duty cycle, commercial temperature range 0°C to 70°C.","salesMarkdown":"## What the UC3844AN does in a boost or flyback supply It drives a single external transistor with a maximum duty cycle of 48% and can switch at frequencies up to 500 kHz, which lets you shrink the transformer and output filter compared to a 100 kHz design. The controller operates from a supply voltage of 10V to 30V and includes frequency control for setting the oscillator timing. It does not support clock synchronization or synchronous rectification, so the design uses a freewheeling diode on the secondary side. STMicroelectronics lists the UC3844AN as Obsolete. If you have an existing design using this controller, you are looking at a last-time-buy to cover remaining production or a redesign with a pin-compatible or functionally equivalent current-mode PWM controller. The 8-DIP through-hole package (8-Mini DIP) is still widely stocked by independent distributors for legacy repairs and short-run builds. Sourcing is per-RFQ — we confirm availability and current pricing at quote time against your BOM quantity. ## Package and temperature — fit check for your board The UC3844AN comes in an 8-pin DIP package (0.300-inch body width, 7.62 mm) with through-hole mounting. This is a legacy footprint — it mates with standard 0.100-inch pitch sockets or solders directly into plated through-holes. For industrial or automotive use, you would need a different part with an extended temperature grade.","metaTitle":"UC3844AN PWM Controller STMicroelectronics – Obsolete","metaDescription":"UC3844AN current-mode PWM controller from STMicroelectronics. Boost/flyback topology, up to 500 kHz, 8-DIP. Obsolete — last-time-buy or replacement options.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Obsolete","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"STMicroelectronics","Series":"-","Package":"Tube","Function":"Step-Up, Step-Up/Step-Down","Topology":"Boost, Flyback","Clock Sync":"No","Output Type":"Transistor Driver","Mounting Type":"Through Hole","Output Phases":"1","Package / Case":"8-DIP (0.300\\\", 7.62mm)","Product Status":"Obsolete","lifecycle_stage":"eol_hot","Control Features":"Frequency Control","Duty Cycle (Max)":"48%","Number of Outputs":"1","Serial Interfaces":"-","Base Product Number":"UC3844","Output Configuration":"Positive, Isolation Capable","Frequency - Switching":"Up to 500kHz","Operating Temperature":"0°C ~ 70°C (TA)","Synchronous Rectifier":"No","Supplier Device Package":"8-Mini DIP","Voltage - Supply (Vcc/Vdd)":"10V ~ 30V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.7900","priceTiers":[{"qty":1,"price":"$1.49000","currency":"USD"},{"qty":10,"price":"$1.33500","currency":"USD"},{"qty":25,"price":"$1.26720","currency":"USD"},{"qty":100,"price":"$1.04100","currency":"USD"},{"qty":250,"price":"$0.97312","currency":"USD"},{"qty":500,"price":"$0.85998","currency":"USD"},{"qty":1000,"price":"$0.67893","currency":"USD"},{"qty":2500,"price":"$0.64050","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/72463d7c352ecebe0441deb1ec8c852d.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/UC3844AN/alternatives.json"},"ai":{"faq":[{"question":"What is the replacement for UC3844AN?","answer":"STMicroelectronics does not list a direct successor for the UC3844AN. For a functional replacement, look at other current-mode PWM controllers in the same family, such as the UC3842AN (which has a different undervoltage lockout threshold and max duty cycle). The UCC2806DWTR from Texas Instruments is a dual-output controller with a similar boost/flyback topology but a 50% duty cycle and surface-mount package — it is not a pin-for-pin drop-in."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/UC3844AN","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/UC3844AN when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T17:50:46.371Z","lastPublished":"2026-07-17T17:50:46.371Z","indexable":true}}