WELWYN/TT ELECTRONICS HM78D-128100MLFTR Shielded Surface Mount Coupled Inductor
The HM78D-128100MLFTR from WELWYN/TT ELECTRONICS is a high-performance shielded surface mount coupled inductor designed for a wide range of electronic applications. Manufactured in China, this component offers reliable inductance and low DCR for efficient power management in compact designs.
Product Features
Shielded surface mount design for enhanced electromagnetic compatibility
Operating temperature range: -40°C to +125°C
Maximum temperature rise: 40°C
Operating frequency up to 3MHz
RoHS compliant for environmentally conscious manufacturing
Electrical Specifications
Connection Type
Part Number
Inductance (μH)
DCR Typ. (Ω)
Saturation Current (A)
RMS Current (A)
Parallel
HM78D-128100MLF
10 ± 20%
0.029
10.50
6.20
Series
HM78D-128100MLF
40 ± 25%
0.116
5.40
3.20
Physical Dimensions
Dimension
Size (mm)
Case Size
128
A
12.5
B
12.5
C
8.05
D
7.0
Recommended Solder Pad Layout
Refer to datasheet for detailed layout
Packaging & Ordering
Standard packaging: Embossed tape and reel
Reel diameter: 13 inches (330.2mm)
Capacity: 500 units per case for size 128
Part Number Example: HM78D-128100MLFTR
Lead-Free, Tolerance options: ±10%, ±20%
Additional Information
For detailed specifications and application guidelines, please refer to the datasheet.
Part Number: HM78D-128100MLFTR Manufacturer: WELWYN/TT ELECTRONICS Country of Origin: CN UOM: EA ECCN: Not specified Package Type: Surface Mount Datasheet:Download Datasheet
Disclaimer
TT Electronics reserves the right to make changes in product specifications without notice. All information is considered accurate at the time of publication. Please verify details before purchase.
Note: The product image displayed is a standard reference image. Actual product appearance may vary. For the most accurate and up-to-date representation, we recommend searching the part number online.
{"id":10005297267005,"title":"HM78D-128100MLFTR","handle":"hm78d-128100mlftr","description":"\u003ch3\u003eWELWYN\/TT ELECTRONICS HM78D-128100MLFTR Shielded Surface Mount Coupled Inductor\u003c\/h3\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eHM78D-128100MLFTR\u003c\/strong\u003e from \u003cstrong\u003eWELWYN\/TT ELECTRONICS\u003c\/strong\u003e is a high-performance shielded surface mount coupled inductor designed for a wide range of electronic applications. Manufactured in China, this component offers reliable inductance and low DCR for efficient power management in compact designs.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eShielded surface mount design for enhanced electromagnetic compatibility\u003c\/li\u003e\n \u003cli\u003eOperating temperature range: -40°C to +125°C\u003c\/li\u003e\n \u003cli\u003eMaximum temperature rise: 40°C\u003c\/li\u003e\n \u003cli\u003eOperating frequency up to 3MHz\u003c\/li\u003e\n \u003cli\u003eRoHS compliant for environmentally conscious manufacturing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eElectrical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eConnection Type\u003c\/th\u003e\n \u003cth\u003ePart Number\u003c\/th\u003e\n \u003cth\u003eInductance (μH)\u003c\/th\u003e\n \u003cth\u003eDCR Typ. (Ω)\u003c\/th\u003e\n \u003cth\u003eSaturation Current (A)\u003c\/th\u003e\n \u003cth\u003eRMS Current (A)\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eParallel\u003c\/td\u003e\n \u003ctd\u003eHM78D-128100MLF\u003c\/td\u003e\n \u003ctd\u003e10 ± 20%\u003c\/td\u003e\n \u003ctd\u003e0.029\u003c\/td\u003e\n \u003ctd\u003e10.50\u003c\/td\u003e\n \u003ctd\u003e6.20\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eSeries\u003c\/td\u003e\n \u003ctd\u003eHM78D-128100MLF\u003c\/td\u003e\n \u003ctd\u003e40 ± 25%\u003c\/td\u003e\n \u003ctd\u003e0.116\u003c\/td\u003e\n \u003ctd\u003e5.40\u003c\/td\u003e\n \u003ctd\u003e3.20\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePhysical Dimensions\u003c\/h3\u003e\n\u003ctable\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eDimension\u003c\/th\u003e\n \u003cth\u003eSize (mm)\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eCase Size\u003c\/td\u003e\n \u003ctd\u003e128\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eA\u003c\/td\u003e\n \u003ctd\u003e12.5\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eB\u003c\/td\u003e\n \u003ctd\u003e12.5\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eC\u003c\/td\u003e\n \u003ctd\u003e8.05\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eD\u003c\/td\u003e\n \u003ctd\u003e7.0\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eRecommended Solder Pad Layout\u003c\/td\u003e\n \u003ctd\u003eRefer to datasheet for detailed layout\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePackaging \u0026amp; Ordering\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eStandard packaging: Embossed tape and reel\u003c\/li\u003e\n \u003cli\u003eReel diameter: 13 inches (330.2mm)\u003c\/li\u003e\n \u003cli\u003eCapacity: 500 units per case for size 128\u003c\/li\u003e\n \u003cli\u003ePart Number Example: HM78D-128100MLFTR\u003c\/li\u003e\n \u003cli\u003eLead-Free, Tolerance options: ±10%, ±20%\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAdditional Information\u003c\/h3\u003e\n\u003cp\u003eFor detailed specifications and application guidelines, please refer to the \u003ca href=\"https:\/\/www.waldomapac.com\/productfiles\/mf-WEW\/HM78D-128100MLFTR.pdf\" target=\"_blank\"\u003edatasheet\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e HM78D-128100MLFTR\u003cbr\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e WELWYN\/TT ELECTRONICS\u003cbr\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e CN\u003cbr\u003e\n\u003cstrong\u003eUOM:\u003c\/strong\u003e EA\u003cbr\u003e\n\u003cstrong\u003eECCN:\u003c\/strong\u003e Not specified\u003cbr\u003e\n\u003cstrong\u003ePackage Type:\u003c\/strong\u003e Surface Mount\u003cbr\u003e\n\u003cstrong\u003eDatasheet:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.waldomapac.com\/productfiles\/mf-WEW\/HM78D-128100MLFTR.pdf\" target=\"_blank\"\u003eDownload Datasheet\u003c\/a\u003e\u003c\/p\u003e\n\n\u003ch3\u003eDisclaimer\u003c\/h3\u003e\n\u003cp\u003eTT Electronics reserves the right to make changes in product specifications without notice. All information is considered accurate at the time of publication. Please verify details before purchase.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNote: The product image displayed is a standard reference image. Actual product appearance may vary. For the most accurate and up-to-date representation, we recommend searching the part number online.\u003c\/strong\u003e\u003c\/p\u003e","published_at":"2025-08-06T21:40:56+05:30","created_at":"2025-08-06T21:40:56+05:30","vendor":"Waldom Electonics","type":"","tags":["STD_IMG","TT","WELWY-TTEL","WLDM"],"price":11642,"price_min":11642,"price_max":11642,"available":true,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":50555731607869,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"HM78D-128100MLFTR","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"HM78D-128100MLFTR","public_title":null,"options":["Default Title"],"price":11642,"weight":250,"compare_at_price":null,"inventory_management":"shopify","barcode":"HM78D-128100MLFTR","requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/thinkrobotics.com\/cdn\/shop\/files\/fbe811dc-181f-41c1-ab5a-dc3410446d1d_0ecfb457-6d56-459a-b819-d9a879525f38.jpg?v=1754496656"],"featured_image":"\/\/thinkrobotics.com\/cdn\/shop\/files\/fbe811dc-181f-41c1-ab5a-dc3410446d1d_0ecfb457-6d56-459a-b819-d9a879525f38.jpg?v=1754496656","options":["Title"],"media":[{"alt":null,"id":45701260869949,"position":1,"preview_image":{"aspect_ratio":1.0,"height":1024,"width":1024,"src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/fbe811dc-181f-41c1-ab5a-dc3410446d1d_0ecfb457-6d56-459a-b819-d9a879525f38.jpg?v=1754496656"},"aspect_ratio":1.0,"height":1024,"media_type":"image","src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/fbe811dc-181f-41c1-ab5a-dc3410446d1d_0ecfb457-6d56-459a-b819-d9a879525f38.jpg?v=1754496656","width":1024}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch3\u003eWELWYN\/TT ELECTRONICS HM78D-128100MLFTR Shielded Surface Mount Coupled Inductor\u003c\/h3\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eHM78D-128100MLFTR\u003c\/strong\u003e from \u003cstrong\u003eWELWYN\/TT ELECTRONICS\u003c\/strong\u003e is a high-performance shielded surface mount coupled inductor designed for a wide range of electronic applications. Manufactured in China, this component offers reliable inductance and low DCR for efficient power management in compact designs.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eShielded surface mount design for enhanced electromagnetic compatibility\u003c\/li\u003e\n \u003cli\u003eOperating temperature range: -40°C to +125°C\u003c\/li\u003e\n \u003cli\u003eMaximum temperature rise: 40°C\u003c\/li\u003e\n \u003cli\u003eOperating frequency up to 3MHz\u003c\/li\u003e\n \u003cli\u003eRoHS compliant for environmentally conscious manufacturing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eElectrical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eConnection Type\u003c\/th\u003e\n \u003cth\u003ePart Number\u003c\/th\u003e\n \u003cth\u003eInductance (μH)\u003c\/th\u003e\n \u003cth\u003eDCR Typ. (Ω)\u003c\/th\u003e\n \u003cth\u003eSaturation Current (A)\u003c\/th\u003e\n \u003cth\u003eRMS Current (A)\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eParallel\u003c\/td\u003e\n \u003ctd\u003eHM78D-128100MLF\u003c\/td\u003e\n \u003ctd\u003e10 ± 20%\u003c\/td\u003e\n \u003ctd\u003e0.029\u003c\/td\u003e\n \u003ctd\u003e10.50\u003c\/td\u003e\n \u003ctd\u003e6.20\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eSeries\u003c\/td\u003e\n \u003ctd\u003eHM78D-128100MLF\u003c\/td\u003e\n \u003ctd\u003e40 ± 25%\u003c\/td\u003e\n \u003ctd\u003e0.116\u003c\/td\u003e\n \u003ctd\u003e5.40\u003c\/td\u003e\n \u003ctd\u003e3.20\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePhysical Dimensions\u003c\/h3\u003e\n\u003ctable\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eDimension\u003c\/th\u003e\n \u003cth\u003eSize (mm)\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eCase Size\u003c\/td\u003e\n \u003ctd\u003e128\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eA\u003c\/td\u003e\n \u003ctd\u003e12.5\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eB\u003c\/td\u003e\n \u003ctd\u003e12.5\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eC\u003c\/td\u003e\n \u003ctd\u003e8.05\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eD\u003c\/td\u003e\n \u003ctd\u003e7.0\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eRecommended Solder Pad Layout\u003c\/td\u003e\n \u003ctd\u003eRefer to datasheet for detailed layout\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePackaging \u0026amp; Ordering\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eStandard packaging: Embossed tape and reel\u003c\/li\u003e\n \u003cli\u003eReel diameter: 13 inches (330.2mm)\u003c\/li\u003e\n \u003cli\u003eCapacity: 500 units per case for size 128\u003c\/li\u003e\n \u003cli\u003ePart Number Example: HM78D-128100MLFTR\u003c\/li\u003e\n \u003cli\u003eLead-Free, Tolerance options: ±10%, ±20%\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAdditional Information\u003c\/h3\u003e\n\u003cp\u003eFor detailed specifications and application guidelines, please refer to the \u003ca href=\"https:\/\/www.waldomapac.com\/productfiles\/mf-WEW\/HM78D-128100MLFTR.pdf\" target=\"_blank\"\u003edatasheet\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e HM78D-128100MLFTR\u003cbr\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e WELWYN\/TT ELECTRONICS\u003cbr\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e CN\u003cbr\u003e\n\u003cstrong\u003eUOM:\u003c\/strong\u003e EA\u003cbr\u003e\n\u003cstrong\u003eECCN:\u003c\/strong\u003e Not specified\u003cbr\u003e\n\u003cstrong\u003ePackage Type:\u003c\/strong\u003e Surface Mount\u003cbr\u003e\n\u003cstrong\u003eDatasheet:\u003c\/strong\u003e \u003ca href=\"https:\/\/www.waldomapac.com\/productfiles\/mf-WEW\/HM78D-128100MLFTR.pdf\" target=\"_blank\"\u003eDownload Datasheet\u003c\/a\u003e\u003c\/p\u003e\n\n\u003ch3\u003eDisclaimer\u003c\/h3\u003e\n\u003cp\u003eTT Electronics reserves the right to make changes in product specifications without notice. All information is considered accurate at the time of publication. Please verify details before purchase.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNote: The product image displayed is a standard reference image. Actual product appearance may vary. For the most accurate and up-to-date representation, we recommend searching the part number online.\u003c\/strong\u003e\u003c\/p\u003e"}
