{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"IR21531SPBF","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"IR21531SPBF","canonicalUrl":"https://icboms.com/infineon/IR21531SPBF","factsUrl":"https://icboms.com/api/mcp/products/IR21531SPBF","rawCanonicalId":null},"summary":{"shortDescription":"Infineon IR21531SPBF half-bridge gate driver, N-Channel MOSFET, 600 V bootstrap, 80 ns rise / 45 ns fall, 10 V to 15.6 V supply, -40°C to 125°C, 8-SOIC, Tube.","salesMarkdown":"## Half-bridge gate driver with integrated bootstrap diode The Infineon IR21531SPBF is a high-voltage half-bridge gate driver designed for driving N-channel MOSFETs in a synchronous half-bridge configuration. It integrates a bootstrap diode for the high-side supply, simplifying the external component count in offline AC-DC converters, ballasts, and motor-drive inverter stages. The driver operates from a 10 V to 15.6 V supply rail, which covers the standard 12 V and 15 V bias rails common in power electronics. The 600 V high-side bootstrap rating allows the high-side driver to float with the switching node in line-voltage applications up to 400 VDC bus. Rise and fall times are 80 ns and 45 ns typical respectively, giving enough margin to set a dead-time that avoids cross-conduction in the half-bridge at switching frequencies up to several hundred kilohertz. The RC input circuit sets the oscillator frequency with an external resistor and capacitor, a common topology in self-oscillating half-bridge controllers. The 600 V high-side voltage rating (bootstrap) is the maximum voltage the high-side driver can withstand when the half-bridge switching node rises to the DC bus. In a typical 230 VAC input offline converter, the rectified DC bus is around 310 V to 400 V, so the 600 V rating provides a comfortable margin for transients and ringing. The bootstrap diode is integrated, which saves one external diode and one resistor compared to discrete bootstrap implementations. The supply voltage range of 10 V to 15.6 V means the undervoltage lockout thresholds are set for standard gate-drive bias rails. A 12 V rail is the most common — it keeps gate drive voltage within the typical Vgs rating of standard N-channel MOSFETs while staying above the driver's UVLO rising threshold.","metaTitle":"IR21531SPBF Half-Bridge Gate Driver, 600 V Bootstrap","metaDescription":"IR21531SPBF half-bridge gate driver with 600 V bootstrap, 80 ns rise / 45 ns fall, 10 V to 15.6 V supply, -40°C to 125°C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"Mfr":"Infineon Technologies","Series":"-","Package":"Tube","Gate Type":"N-Channel MOSFET","Input Type":"RC Input Circuit","Channel Type":"Synchronous","Mounting Type":"Surface Mount","Package / Case":"8-SOIC (0.154\\\", 3.90mm Width)","Product Status":"Active","lifecycle_stage":"eol_hot","Voltage - Supply":"10V ~ 15.6V","Number of Drivers":"2","Base Product Number":"IR21531","Driven Configuration":"Half-Bridge","Operating Temperature":"-40°C~125°C(TJ)","Rise / Fall Time (Typ)":"80ns, 45ns","Supplier Device Package":"8-SOIC","Logic Voltage - VIL, VIH":"-","High Side Voltage - Max (Bootstrap)":"600 V","Current - Peak Output (Source, Sink)":"-"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.9600","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/IR21531SPBF/alternatives.json"},"ai":{"faq":[{"question":"Is IR21531SPBF compatible with 12V systems?","answer":"Yes. The supply voltage range of 10 V to 15.6 V covers a 12 V bias rail directly. The undervoltage lockout thresholds are set within this range, so a 12 V supply keeps the driver operational and provides adequate gate drive voltage for standard N-channel MOSFETs."},{"question":"Can IR21531SPBF be used as a replacement for IR2153?","answer":"The IR21531SPBF is a variant of the IR2153 family with a different package and temperature grade. The IR21531SPBF is in an 8-SOIC surface-mount package, while the IR2153 is typically in a DIP-8. Pin compatibility depends on the specific IR2153 variant — confirm the pinout and package footprint before substituting. The electrical characteristics (600 V bootstrap, 80 ns rise / 45 ns fall, 10 V to 15.6 V supply) are consistent across the family."},{"question":"What is the difference between IR21531SPBF and IR21531PBF?","answer":"The suffix 'SPBF' indicates the 8-SOIC surface-mount package, while 'PBF' typically refers to a DIP-8 through-hole package. Both are lead-free (PbF). The electrical specifications — 600 V bootstrap, 80 ns rise / 45 ns fall, 10 V to 15.6 V supply, -40°C to 125°C — are the same. The choice is driven by the PCB assembly process: surface-mount vs through-hole."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/IR21531SPBF","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/IR21531SPBF when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:03:28.771Z","lastPublished":"2026-07-22T18:03:28.771Z","indexable":true}}