{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"STTS2004B2DN3F","brand":"STMicroelectronics","brandSlug":"stmicroelectronics","productSlug":"STTS2004B2DN3F","canonicalUrl":"https://icboms.com/stmicroelectronics/STTS2004B2DN3F","factsUrl":"https://icboms.com/api/mcp/products/STTS2004B2DN3F","rawCanonicalId":null},"summary":{"shortDescription":"STMicroelectronics STTS2004B2DN3F, Temp Monitoring System (Sensor) for DIMM DDR Memory, ±3°C Max Accuracy, I²C, 2.2V~3.6V, -20°C~125°C, 8-TDFN (2x3), Active.","salesMarkdown":"## DIMM thermal watchdog with on-chip EEPROM The STTS2004B2DN3F is a temperature monitoring system from STMicroelectronics built specifically for DIMM DDR memory modules. It integrates a sigma-delta ADC, a register bank, and 4 Kbit of EEPROM — the EEPROM holds the module's SPD (Serial Presence Detect) data, while the sensor tracks the DIMM's thermal state and reports it over a 2-wire I²C bus. Accuracy is rated at ±3°C maximum across the full -20°C to 125°C sensing range, which covers the operating envelope of server, workstation, and desktop DIMMs. The supply rail accepts 2.2V to 3.6V, letting it run directly from a 3.3V or 2.5V DIMM power plane without an extra LDO. Packaged in an 8-TDFN with exposed pad (2x3 mm footprint), it mounts flush on the DIMM PCB — surface-mount only, no through-hole option. The part is active in ST's portfolio and ROHS3 compliant. ## What the ±3°C accuracy means for the BOM A ±3°C maximum error is the thermal tolerance your system sees at the worst-case corner — not a typical figure, but the guaranteed limit over temperature and supply. ## I²C interface and DIMM compatibility Communication is 2-wire I²C, the same bus used by the DIMM's SPD EEPROM. The STTS2004B2DN3F shares the I²C bus with the SPD data — the sensor has its own I²C address, so no collision. The part is designed for DDR memory modules, but the evidence does not specify DDR3, DDR4, or DDR5 explicitly; the supply range and temperature range are compatible with all three. The on-chip EEPROM stores the SPD content, so this single IC replaces a separate EEPROM plus a temperature sensor — a BOM consolidation move for memory module makers. It is ROHS3 compliant. For a DIMM module builder or a server OEM qualifying this into a BOM, the active status means no forced redesign cycle.","metaTitle":"STTS2004B2DN3F Temperature Sensor, ±3°C Max, I²C, 8-TDFN","metaDescription":"STTS2004B2DN3F temp monitoring system for DIMM DDR memory. ±3°C max accuracy, I²C interface, 2.2-3.6V supply, 8-TDFN package. Active, ROHS3.","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)","Accuracy":"±3°C(Max)","Function":"Temp Monitoring System (Sensor), DIMM DDR Memory","Topology":"ADC (Sigma Delta), Register Bank","Output Fan":"No","Output Type":"2-Wire Serial, I²C","Sensor Type":"Internal","Output Alarm":"Yes","Mounting Type":"Surface Mount","Package / Case":"8-WFDFN Exposed Pad","lifecycle_stage":"eol_hot","Voltage - Supply":"2.2V ~ 3.6V","Sensing Temperature":"-20°C ~ 125°C","Operating Temperature":"-20°C ~ 125°C","Supplier Device Package":"8-TDFN (2x3)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.96","priceTiers":[{"qty":1,"price":"$1.96000","currency":"USD"},{"qty":10,"price":"$1.75900","currency":"USD"},{"qty":25,"price":"$1.65960","currency":"USD"},{"qty":100,"price":"$1.41380","currency":"USD"},{"qty":250,"price":"$1.32756","currency":"USD"},{"qty":500,"price":"$1.16160","currency":"USD"},{"qty":1000,"price":"$1.09585","currency":"USD"},{"qty":3000,"price":"$1.09585","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/38518957a0978e9558b6e7780cba6fad.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/STTS2004B2DN3F/alternatives.json"},"ai":{"faq":[{"question":"What is the accuracy of STTS2004B2DN3F?","answer":"The accuracy is ±3°C maximum over the full -20°C to 125°C temperature range. This is the worst-case guaranteed limit, not a typical value."},{"question":"Is STTS2004B2DN3F compatible with DDR4 DIMMs?","answer":"The part is designed for DIMM DDR memory modules. Its 2.2V to 3.6V supply range and -20°C to 125°C sensing range are compatible with DDR4 DIMM requirements. The evidence does not explicitly list DDR4, but the electrical and thermal specifications align."},{"question":"Is STTS2004B2DN3F obsolete?","answer":"No — STMicroelectronics lists the STTS2004B2DN3F as Active. There is no end-of-life notice or discontinuation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/stmicroelectronics/STTS2004B2DN3F","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/stmicroelectronics/STTS2004B2DN3F 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}}