{"product_id":"ft140-43-nickel-zinc-ferrite-toroid-core-36x23x12-7mm-850-permeability","title":"FT140-43 NiZn Ferrite Toroid Core 36x23x12.7mm | 850µ Mix 43","description":"\n\u003ch2\u003eFT140-43 Nickel-Zinc Ferrite Toroid Core – High Permeability RF \u0026amp; EMI Filtering\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eFT140-43 Nickel-Zinc Ferrite Toroid Core\u003c\/strong\u003e is a precision-engineered, ring-shaped magnetic core designed for RF chokes, EMI suppression filters, broadband transformers, and power inductors. With an outer diameter of \u003cstrong\u003e36mm\u003c\/strong\u003e, inner diameter of \u003cstrong\u003e23mm\u003c\/strong\u003e, and height of \u003cstrong\u003e12.7mm\u003c\/strong\u003e, this toroid delivers \u003cstrong\u003ehigh permeability rated at 850 (±20%)\u003c\/strong\u003e — ideal for amateur radio (ham radio), telecommunications, and electronics hobbyist applications.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Mix 43 Nickel-Zinc (NiZn) Ferrite\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e OD 36mm × ID 23mm × H 12.7mm (equivalent to FT140 size)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInitial Permeability (µi):\u003c\/strong\u003e 850 ±20%\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFrequency Range:\u003c\/strong\u003e Optimized for 1 MHz – 300 MHz applications\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCore Shape:\u003c\/strong\u003e Toroidal (ring) — self-shielding, low leakage flux\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Typically grey\/nickel finish (characteristic of Mix 43 material)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e RF chokes, baluns, EMI\/RFI filters, broadband transformers, common-mode chokes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNon-electrified:\u003c\/strong\u003e Passive component, contains no high-concern chemicals\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat Is Mix 43 Ferrite?\u003c\/h3\u003e\n\u003cp\u003eMix 43 is a Nickel-Zinc ferrite compound widely recognised in the RF engineering community for its excellent broadband suppression characteristics across \u003cstrong\u003eHF to VHF frequencies\u003c\/strong\u003e. It is especially effective for winding common-mode chokes and 1:1 or 4:1 baluns used in antenna feed lines and transceiver circuits. Its high permeability makes it efficient at suppressing unwanted common-mode currents with fewer winding turns.\u003c\/p\u003e\n\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAmateur (Ham) Radio — baluns \u0026amp; antenna chokes\u003c\/li\u003e\n  \u003cli\u003eEMI \/ RFI noise suppression in power supplies\u003c\/li\u003e\n  \u003cli\u003eBroadband RF transformers\u003c\/li\u003e\n  \u003cli\u003eCommon-mode chokes for USB, audio, and data lines\u003c\/li\u003e\n  \u003cli\u003eSwitch-mode power supply (SMPS) inductors\u003c\/li\u003e\n  \u003cli\u003eEducational \u0026amp; hobbyist electronics projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-channel-relay-module-dc-3-3v-24v-optocoupler-arduino\"\u003e1-Channel Relay Module DC 3.3V–24V Optocoupler for Arduino\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-channel-scr-solid-state-relay-switch-module-dc3-24v-40a-optocoupler\"\u003e1-Channel SCR Solid State Relay Module DC3-24V 40A Optocoupler\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eExternal Reference\u003c\/h3\u003e\n\u003cp\u003eFor background on electromagnetic compatibility (EMC) standards and ferrite component performance guidelines, visit the NIST Electromagnetic Fields Group.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Ferrite_core\" target=\"_blank\" rel=\"noopener\"\u003eFerrite core\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What frequency range is the FT140-43 nickel-zinc ferrite toroid core best suited for?\u003c\/h4\u003e\n\u003cp\u003eA: The FT140-43 Mix 43 NiZn ferrite toroid is optimised for use across approximately 1 MHz to 300 MHz. It is particularly popular for HF and VHF amateur radio baluns, broadband RF transformers, and common-mode choke applications in this frequency band.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What does the permeability rating of 850 (±20%) mean for this ferrite core?\u003c\/h4\u003e\n\u003cp\u003eA: Permeability (µi) indicates how effectively a material concentrates magnetic flux compared to air. A rating of 850 ±20% means the FT140-43 ferrite toroid has very high magnetic permeability, allowing you to achieve the required inductance with fewer winding turns — saving wire and reducing winding resistance in your RF choke or transformer design.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the difference between Mix 43 and other ferrite mixes like Mix 31 or Mix 61?\u003c\/h4\u003e\n\u003cp\u003eA: Mix 43 (µi ≈ 850) offers the broadest HF suppression bandwidth and is excellent for common-mode chokes and baluns across 1–300 MHz. Mix 31 (µi ≈ 1500) is better below 10 MHz (MF\/LF), while Mix 61 (µi ≈ 125) excels at VHF frequencies above 200 MHz with lower loss. Mix 43 strikes a strong balance for general HF ham radio and EMI suppression use.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I use this toroid core in a switch-mode power supply (SMPS)?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The FT140-43 ferrite toroid is suitable for use as a common-mode choke or output filter inductor in SMPS designs operating in the HF range. Ensure your operating frequency and flux density requirements fall within the core's rated parameters for best performance.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What frequency range is the FT140-43 nickel-zinc ferrite toroid core best suited for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The FT140-43 Mix 43 NiZn ferrite toroid is optimised for use across approximately 1 MHz to 300 MHz. It is particularly popular for HF and VHF amateur radio baluns, broadband RF transformers, and common-mode choke applications in this frequency band.\"}}, {\"@type\": \"Question\", \"name\": \"What does the permeability rating of 850 (±20%) mean for this ferrite core?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Permeability (µi) indicates how effectively a material concentrates magnetic flux compared to air. A rating of 850 ±20% means the FT140-43 ferrite toroid has very high magnetic permeability, allowing you to achieve the required inductance with fewer winding turns — saving wire and reducing winding resistance in your RF choke or transformer design.\"}}, {\"@type\": \"Question\", \"name\": \"What is the difference between Mix 43 and other ferrite mixes like Mix 31 or Mix 61?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Mix 43 (µi ≈ 850) offers the broadest HF suppression bandwidth and is excellent for common-mode chokes and baluns across 1–300 MHz. Mix 31 (µi ≈ 1500) is better below 10 MHz (MF\/LF), while Mix 61 (µi ≈ 125) excels at VHF frequencies above 200 MHz with lower loss. Mix 43 strikes a strong balance for general HF ham radio and EMI suppression use.\"}}, {\"@type\": \"Question\", \"name\": \"Can I use this toroid core in a switch-mode power supply (SMPS)?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. The FT140-43 ferrite toroid is suitable for use as a common-mode choke or output filter inductor in SMPS designs operating in the HF range. Ensure your operating frequency and flux density requirements fall within the core's rated parameters for best performance.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/oasis-select.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Electronics \u0026 Tech\", \"item\": \"https:\/\/oasis-select.com\/collections\/electronics-tech\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"FT140-43 NiZn Ferrite Toroid Core 36x23x12.7mm | 850µ Mix 43\", \"item\": \"https:\/\/oasis-select.com\/products\/ft140-43-nickel-zinc-ferrite-toroid-core-36x23x12-7mm-850-permeability\"}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"Default Title","offer_id":47745255571561,"sku":"\u003cnone\u003e","price":14.13,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/S0aec4bd024c647fe9e8e78f5a7fd3030R.webp?v=1783031321","url":"https:\/\/oasis-select.com\/products\/ft140-43-nickel-zinc-ferrite-toroid-core-36x23x12-7mm-850-permeability","provider":"Oasis Select","version":"1.0","type":"link"}