{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"L9942XP1TR","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"L9942XP1TR","canonicalUrl":"https://icboms.com/stmicroelectronics/L9942XP1TR","factsUrl":"https://icboms.com/api/mcp/products/L9942XP1TR","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics L9942XP1TR fully integrated bipolar stepper motor driver, DMOS technology, 1.3 A output, 7-20 V load, SPI interface, 1/32 microstepping, PowerSSO-24, -40 to +150 °C, Tape & Reel.","salesMarkdown":"## Integrated bipolar stepper drive with microstepping The L9942XP1TR is a fully integrated bipolar stepper motor driver from STMicroelectronics, combining the control logic and power stage in a single PowerSSO-24 package. It drives one bipolar stepper motor using four half-bridge outputs rated for 1.3 A continuous per bridge. The DMOS output stage keeps conduction losses in check — the Rds(on) at junction temperature determines the thermal budget at 1.3 A, so the 150 °C Tj max rating gives headroom for under-hood or engine-bay duty where ambient soaks above 105 °C. Microstepping resolution is programmable via SPI up to 1/32 step, which smooths low-speed torque ripple and reduces mechanical resonance in the load. The SPI interface also handles diagnostic readback — useful for detecting stall or open-winding conditions without an external sense resistor network. ## Supply rails and operating envelope The motor supply (VM) accepts 7 V to 20 V, covering nominal 12 V automotive batteries with margin for cold-crank dips and load-dump spikes within the absolute maximum. ## Package, mounting, and procurement The tape-and-reel option suits high-volume pick-and-place assembly.","metaTitle":"L9942XP1TR STMicroelectronics Stepper Driver, 1.3A","metaDescription":"STMicroelectronics L9942XP1TR fully integrated bipolar stepper motor driver, 1.3 A output, SPI interface, DMOS technology, PowerSSO-24 package.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","Function":"Driver - Fully Integrated, Control and Power Stage","Interface":"SPI","Technology":"DMOS","Applications":"Automotive","Mounting Type":"Surface Mount","Package / Case":"24-PowerBSOP (0.295\\\", 7.50mm Width)","Voltage - Load":"7V ~ 20V","Step Resolution":"1, 1/2, 1/8, 1/16, 1/32","lifecycle_stage":"eol_hot","Current - Output":"1.3A","Voltage - Supply":"3V ~ 5.3V","Motor Type - Stepper":"Bipolar","Output Configuration":"Half Bridge (4)","Operating Temperature":"-40°C ~ 150°C (TJ)","Supplier Device Package":"PowerSSO-24"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$5.89","priceTiers":[{"qty":1,"price":"$5.89000","currency":"USD"},{"qty":10,"price":"$5.28800","currency":"USD"},{"qty":25,"price":"$4.99960","currency":"USD"},{"qty":100,"price":"$4.33290","currency":"USD"},{"qty":250,"price":"$4.11072","currency":"USD"},{"qty":500,"price":"$3.68852","currency":"USD"},{"qty":1000,"price":"$3.11080","currency":"USD"},{"qty":2000,"price":"$2.95526","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/722681fd27dec2df76710f55633760c2.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/L9942XP1TR/alternatives.json"},"ai":{"faq":[{"question":"What is the output current rating and what does it mean for the thermal design?","answer":"The L9942XP1TR is rated for 1.3 A continuous per half-bridge. At that current, the DMOS Rds(on) generates heat that must be sunk through the exposed pad."},{"question":"What stepper motor types and microstepping resolutions does the L9942XP1TR support?","answer":"It drives bipolar stepper motors with four half-bridge outputs. The SPI-programmable step resolution covers full-step, half-step, 1/8, 1/16, and 1/32 microstepping. The 1/32 mode delivers the smoothest low-speed motion and the highest positional resolution for applications like valve positioning or headlamp leveling."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/L9942XP1TR","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/L9942XP1TR 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}}