{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MMBTA42LT1HTSA1","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"MMBTA42LT1HTSA1","canonicalUrl":"https://icboms.com/infineon/MMBTA42LT1HTSA1","factsUrl":"https://icboms.com/api/mcp/products/MMBTA42LT1HTSA1","rawCanonicalId":null},"summary":{"shortDescription":"Infineon MMBTA42LT1HTSA1 NPN transistor, 300 V VCEO, 500 mA Ic, 360 mW, 70 MHz ft, SOT-23-3 package, surface mount.","salesMarkdown":"## 300 V NPN in a SOT-23 — what the ratings mean The Infineon MMBTA42LT1HTSA1 is a high-voltage NPN bipolar transistor in a SOT-23-3 surface-mount package. The 500 mA maximum collector current (Ic) and 360 mW power dissipation define the safe operating area in that small package; at 300 V you're not pulling 500 mA continuously, but the current rating gives headroom for transient loads like relay coil kickback or flyback snubber circuits. ## Switching performance and drive requirements Transition frequency is 70 MHz, adequate for switching applications up to a few megahertz — think 100 kHz flyback converters, display bias supplies, or solenoid drivers where the 300 V rating is the constraint, not the speed. The 500 mV Vce saturation at 20 mA collector current (with 2 mA base drive) is moderate; the hFE minimum of 40 at 30 mA, 10 V means you need a base current around 2.5% of the collector load to guarantee saturation. The 100 nA collector cutoff current (ICBO) at 25 °C is clean for a high-voltage device, but expect it to double roughly every 10 °C rise — factor that into high-temperature leakage budgets. ## Last Buy — what it means for procurement That means the manufacturer has announced end-of-life and the final ordering window is open. For a BOM line using the MMBTA42LT1HTSA1, the decision is time-sensitive: either place a last-time buy for estimated lifetime demand, or qualify a replacement. The base product number is MMBTA42, so other suffix variants (different hFE grade or packaging) may still be active — check each suffix individually. No lead-time number can be stated here because the Last Buy window is finite and stock is drawn down by the day.","metaTitle":"MMBTA42LT1HTSA1 NPN Transistor, 300 V, 500 mA, SOT-23","metaDescription":"Infineon MMBTA42LT1HTSA1 NPN transistor, 300 V VCEO, 500 mA Ic, 360 mW, SOT-23.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Last Buy","categoryPath":["Discrete Semiconductors"],"specifications":{"Mfr":"Infineon Technologies","Series":"-","Package":"Tape & Reel (TR); Cut Tape (CT)","Power - Max":"360 mW","Mounting Type":"Surface Mount","Package / Case":"TO-236-3, SC-59, SOT-23-3","Product Status":"Not For New Designs","Transistor Type":"NPN","lifecycle_stage":"eol_hot","Base Product Number":"MMBTA42","Operating Temperature":"150°C(TJ)","Frequency - Transition":"70MHz","Supplier Device Package":"PG-SOT23","Vce Saturation (Max) @ Ib, Ic":"500mV @ 2mA, 20mA","Current - Collector (Ic) (Max)":"500 mA","Current - Collector Cutoff (Max)":"100nA (ICBO)","DC Current Gain (hFE) (Min) @ Ic, Vce":"40 @ 30mA, 10V","Voltage - Collector Emitter Breakdown (Max)":"300 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.3900","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/b1853886cf396f968983741ef153b659.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is MMBTA42LT1HTSA1 obsolete or end-of-life?","answer":"Yes, the MMBTA42LT1HTSA1 carries a Last Buy lifecycle status. The manufacturer has announced discontinuation and the final ordering window is active. This is not a surprise EOL — it is a planned phase-out with a known last-time-buy period. For a production BOM, you should either place a lifetime buy or begin qualifying a replacement now."},{"question":"What is the maximum collector current (Ic) of MMBTA42LT1HTSA1?","answer":"The maximum collector current (Ic) is 500 mA. Combined with the 300 V VCEO breakdown, this defines the switching capability — but in the SOT-23 package the 360 mW power dissipation limit will constrain continuous current at high Vce. For a 300 V rail, practical continuous current is in the tens of milliamps before the thermal budget is consumed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/MMBTA42LT1HTSA1","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/MMBTA42LT1HTSA1 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}