{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM120H-12","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM120H-12","canonicalUrl":"https://icboms.com/texas-instruments/LM120H-12","factsUrl":"https://icboms.com/api/mcp/products/LM120H-12","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM120H-12 linear voltage regulator, fixed -12V output, 200mA, TO-205AD / TO-39-3 metal can, through-hole, bulk package.","salesMarkdown":"## What this -12V fixed regulator does on the board The Texas Instruments LM120H-12 is a single-output linear regulator that delivers a fixed -12V rail from a negative input up to -32V maximum. It sources up to 200 mA continuous, making it a direct fit for powering analog signal chains, op-amp supplies, or interface circuits that need a clean negative voltage referenced to ground. The output is fixed at -12V with no external resistor divider needed — the internal bandgap reference sets the regulation point. Quiescent current is 1 mA typical, which matters for battery-powered or thermally constrained designs where the regulator's own draw adds to the load. ## PSRR and noise rejection at line frequency Power-supply rejection ratio is 64 dB at 120 Hz — this is the ripple-rejection figure that matters when the regulator follows a full-wave rectifier. At 64 dB, a 1 Vpp ripple on the input is attenuated to roughly 0.6 mVpp at the output, keeping the -12V rail clean for sensitive analog loads like preamplifiers or ADC reference buffers. The 120 Hz test frequency is standard for line-frequency applications (60 Hz full-wave ripple). The PSRR rolls off above this frequency, so for switching preregulators a post-filter or additional decoupling is needed to maintain rejection at higher harmonics. ## Temperature range and package — where this regulator survives This qualifies the LM120H-12 for avionics, satellite power distribution, downhole instrumentation, and engine-bay electronics where the ambient temperature exceeds commercial or industrial limits. The TO-205AD / TO-39-3 metal can (supplier device package TO-3) is a hermetic package — the metal lid and glass-to-metal seals keep moisture and contaminants out. Through-hole mounting with the metal tab provides a low thermal resistance path to the board or heatsink, which is essential for dissipating the dropout power at high input-output differentials. ## Protection and compliance details Built-in over-temperature protection shuts down the regulator if the die temperature exceeds the safe operating limit — this prevents thermal runaway under sustained overload or high ambient conditions.","metaTitle":"Texas Instruments LM120H-12 Linear Regulator","metaDescription":"Active-production -12V fixed-output LDO in hermetic TO-39 metal can. 200mA output, 64dB PSRR at 120Hz, -55°C to 150°C range. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Power Management (PMIC / Gate Driver)"],"specifications":{"PSRR":"64dB (120Hz)","Package":"Bulk","Output Type":"Fixed","Mounting Type":"Through Hole","Package / Case":"TO-205AD, TO-39-3 Metal Can","lifecycle_stage":"eol_hot","Current - Output":"200mA","Protection Features":"Over Temperature","Number of Regulators":"1","Output Configuration":"Negative","Operating Temperature":"-55°C ~ 150°C","Voltage - Input (Max)":"-32V","Supplier Device Package":"TO-3","Current - Quiescent (Iq)":"1 mA","Voltage - Output (Min/Fixed)":"-12V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$21.67","priceTiers":[{"qty":1,"price":"$21.67000","currency":"USD"},{"qty":10,"price":"$19.98100","currency":"USD"},{"qty":25,"price":"$19.08320","currency":"USD"},{"qty":100,"price":"$17.06260","currency":"USD"},{"qty":250,"price":"$16.27684","currency":"USD"},{"qty":500,"price":"$15.88500","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/1257e4b33a4d7574011c44e419e4a8ad.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM120H-12/alternatives.json"},"ai":{"faq":[{"question":"What is LM120H-12's PSRR at 120 Hz?","answer":"The power-supply rejection ratio is 64 dB at 120 Hz. This is the line-frequency ripple rejection figure, measured with a 120 Hz input ripple — typical for full-wave rectified 60 Hz mains."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM120H-12","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM120H-12 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}}