Current Sense Transformer B82801B0324A040 by EPCOS
The EPCOS B82801B0324A040 is a high-quality current sense transformer designed for precise current measurement in switching power supplies, overload sensing, feedback control, and load drop/shut down detection applications. Manufactured in China (COO: CN), this transformer complies with RoHS standards and is available in a reel packaging type for efficient automated assembly.
Product Features
Series/Type: B82801B
Application: Switching power supplies, feedback control, overload sensing, load drop/shut down detection
Very low DC resistance for efficient power transfer
Delivered on a 16 mm blister tape or 330 mm reel, with packing units of 900 pcs/reel or 7200 pcs/carton
Technical Specifications
Parameter
Value
Inductance (L min)
80 μH (for 1:20 turns ratio), up to 2000 μH (for 1:100 turns ratio)
Turns ratio (N:Ns)
1:20 to 1:200 (see ordering codes)
DC Resistance R (max)
0.6 mΩ
Sensed current
Max primary current of 20 A causes approx. +40 °C temperature rise
Frequency range
50 kHz ... 1 MHz
Hi-pot test voltage
1000 V AC, 50 Hz, 2 s (winding to winding)
Solderability
≥ 99.9% Sn, lead-free, +245°C for 3 seconds
Resistance to soldering heat
+260°C for 10 seconds
Storage conditions
–20°C to +40°C, ≤ 75% RH
Operating temperature range
–40°C to +125°C
Weight
Approx. 0.4 g
Application Circuit and Pinning
Refer to the datasheet for detailed application circuit diagrams and pin configurations. [Datasheet](https://www.waldomapac.com/upload/parts/datasheets/mf-eps/eps-b82801b0324a040.pdf)
{"id":10013474947389,"title":"B82801B0324A040","handle":"b82801b0324a040","description":"\u003ch3\u003eCurrent Sense Transformer B82801B0324A040 by EPCOS\u003c\/h3\u003e\n\n\u003cp\u003eThe EPCOS B82801B0324A040 is a high-quality current sense transformer designed for precise current measurement in switching power supplies, overload sensing, feedback control, and load drop\/shut down detection applications. Manufactured in China (COO: CN), this transformer complies with RoHS standards and is available in a reel packaging type for efficient automated assembly.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eSeries\/Type: B82801B\u003c\/li\u003e\n \u003cli\u003eApplication: Switching power supplies, feedback control, overload sensing, load drop\/shut down detection\u003c\/li\u003e\n \u003cli\u003eVery low DC resistance for efficient power transfer\u003c\/li\u003e\n \u003cli\u003eMultiple turns ratios available: 1:40 (this model), 1:20, 1:30, 1:50, 1:60, 1:70, 1:100, 1:125, 1:200\u003c\/li\u003e\n \u003cli\u003eSmall package size for space-constrained designs\u003c\/li\u003e\n \u003cli\u003eRoHS compliant\u003c\/li\u003e\n \u003cli\u003eDelivered on a 16 mm blister tape or 330 mm reel, with packing units of 900 pcs\/reel or 7200 pcs\/carton\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n \u003cth\u003eParameter\u003c\/th\u003e\n \u003cth\u003eValue\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eInductance (L min)\u003c\/td\u003e\n \u003ctd\u003e80 μH (for 1:20 turns ratio), up to 2000 μH (for 1:100 turns ratio)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eTurns ratio (N:Ns)\u003c\/td\u003e\n \u003ctd\u003e1:20 to 1:200 (see ordering codes)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eDC Resistance R (max)\u003c\/td\u003e\n \u003ctd\u003e0.6 mΩ\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eSensed current\u003c\/td\u003e\n \u003ctd\u003eMax primary current of 20 A causes approx. +40 °C temperature rise\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eFrequency range\u003c\/td\u003e\n \u003ctd\u003e50 kHz ... 1 MHz\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eHi-pot test voltage\u003c\/td\u003e\n \u003ctd\u003e1000 V AC, 50 Hz, 2 s (winding to winding)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eSolderability\u003c\/td\u003e\n \u003ctd\u003e≥ 99.9% Sn, lead-free, +245°C for 3 seconds\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eResistance to soldering heat\u003c\/td\u003e\n \u003ctd\u003e+260°C for 10 seconds\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eStorage conditions\u003c\/td\u003e\n \u003ctd\u003e–20°C to +40°C, ≤ 75% RH\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eOperating temperature range\u003c\/td\u003e\n \u003ctd\u003e–40°C to +125°C\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eWeight\u003c\/td\u003e\n \u003ctd\u003eApprox. 0.4 g\u003c\/td\u003e\n \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eApplication Circuit and Pinning\u003c\/h3\u003e\n\u003cp\u003eRefer to the datasheet for detailed application circuit diagrams and pin configurations. [Datasheet](https:\/\/www.waldomapac.com\/upload\/parts\/datasheets\/mf-eps\/eps-b82801b0324a040.pdf)\u003c\/p\u003e\n\n\u003ch3\u003eOrdering Codes and Characteristics\u003c\/h3\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n \u003cth\u003eInductance (μH)\u003c\/th\u003e\n \u003cth\u003eTurns ratio N : Ns\u003c\/th\u003e\n \u003cth\u003eDC Resistance R (mΩ)\u003c\/th\u003e\n \u003cth\u003eVoltage-time product V·μs\u003c\/th\u003e\n \u003cth\u003eRecommended R\u003csub\u003eT\u003c\/sub\u003e (Ω)\u003c\/th\u003e\n \u003cth\u003ePart Number\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e80\u003c\/td\u003e\n \u003ctd\u003e1 : 20\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e10.0\u003c\/td\u003e\n \u003ctd\u003e20\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0803A020\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e180\u003c\/td\u003e\n \u003ctd\u003e1 : 30\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e15.0\u003c\/td\u003e\n \u003ctd\u003e30\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0184A030\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e320\u003c\/td\u003e\n \u003ctd\u003e1 : 40\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e20.0\u003c\/td\u003e\n \u003ctd\u003e40\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0324A040\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e500\u003c\/td\u003e\n \u003ctd\u003e1 : 50\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e25.0\u003c\/td\u003e\n \u003ctd\u003e50\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0504A050\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e720\u003c\/td\u003e\n \u003ctd\u003e1 : 60\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e30.0\u003c\/td\u003e\n \u003ctd\u003e60\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0724A060\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e980\u003c\/td\u003e\n \u003ctd\u003e1 : 70\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e35.0\u003c\/td\u003e\n \u003ctd\u003e70\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0984A070\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e2000\u003c\/td\u003e\n \u003ctd\u003e1 : 100\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e50.0\u003c\/td\u003e\n \u003ctd\u003e100\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0205A100\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e3000\u003c\/td\u003e\n \u003ctd\u003e1 : 125\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e62.5\u003c\/td\u003e\n \u003ctd\u003e125\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0305A125\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e8000\u003c\/td\u003e\n \u003ctd\u003e1 : 200\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e100.0\u003c\/td\u003e\n \u003ctd\u003e200\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0925A200\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eDisclaimers\u003c\/h3\u003e\n\u003cp\u003ePlease review the cautions and warnings in the datasheet before use. For more detailed specifications and application notes, refer to the \u003ca href=\"https:\/\/www.waldomapac.com\/upload\/parts\/datasheets\/mf-eps\/eps-b82801b0324a040.pdf\"\u003edatasheet\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003eNote: Datasheet was not processed; please search the internet for the part number for more details.\u003c\/p\u003e","published_at":"2025-08-10T17:35:04+05:30","created_at":"2025-08-10T17:35:04+05:30","vendor":"Waldom Electonics","type":"Transformers","tags":["20A","Current","EPCOS","IMPORT_CSV","Transformer","WLDM"],"price":18433,"price_min":18433,"price_max":18433,"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":50578436489533,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"B82801B0324A040","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"B82801B0324A040","public_title":null,"options":["Default Title"],"price":18433,"weight":250,"compare_at_price":null,"inventory_management":"shopify","barcode":"B82801B0324A040","requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/thinkrobotics.com\/cdn\/shop\/files\/B82801B0324A040_56006092_528a7148.jpg?v=1754827508"],"featured_image":"\/\/thinkrobotics.com\/cdn\/shop\/files\/B82801B0324A040_56006092_528a7148.jpg?v=1754827508","options":["Title"],"media":[{"alt":null,"id":45763378643261,"position":1,"preview_image":{"aspect_ratio":1.0,"height":200,"width":200,"src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/B82801B0324A040_56006092_528a7148.jpg?v=1754827508"},"aspect_ratio":1.0,"height":200,"media_type":"image","src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/B82801B0324A040_56006092_528a7148.jpg?v=1754827508","width":200}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch3\u003eCurrent Sense Transformer B82801B0324A040 by EPCOS\u003c\/h3\u003e\n\n\u003cp\u003eThe EPCOS B82801B0324A040 is a high-quality current sense transformer designed for precise current measurement in switching power supplies, overload sensing, feedback control, and load drop\/shut down detection applications. Manufactured in China (COO: CN), this transformer complies with RoHS standards and is available in a reel packaging type for efficient automated assembly.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eSeries\/Type: B82801B\u003c\/li\u003e\n \u003cli\u003eApplication: Switching power supplies, feedback control, overload sensing, load drop\/shut down detection\u003c\/li\u003e\n \u003cli\u003eVery low DC resistance for efficient power transfer\u003c\/li\u003e\n \u003cli\u003eMultiple turns ratios available: 1:40 (this model), 1:20, 1:30, 1:50, 1:60, 1:70, 1:100, 1:125, 1:200\u003c\/li\u003e\n \u003cli\u003eSmall package size for space-constrained designs\u003c\/li\u003e\n \u003cli\u003eRoHS compliant\u003c\/li\u003e\n \u003cli\u003eDelivered on a 16 mm blister tape or 330 mm reel, with packing units of 900 pcs\/reel or 7200 pcs\/carton\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n \u003cth\u003eParameter\u003c\/th\u003e\n \u003cth\u003eValue\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eInductance (L min)\u003c\/td\u003e\n \u003ctd\u003e80 μH (for 1:20 turns ratio), up to 2000 μH (for 1:100 turns ratio)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eTurns ratio (N:Ns)\u003c\/td\u003e\n \u003ctd\u003e1:20 to 1:200 (see ordering codes)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eDC Resistance R (max)\u003c\/td\u003e\n \u003ctd\u003e0.6 mΩ\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eSensed current\u003c\/td\u003e\n \u003ctd\u003eMax primary current of 20 A causes approx. +40 °C temperature rise\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eFrequency range\u003c\/td\u003e\n \u003ctd\u003e50 kHz ... 1 MHz\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eHi-pot test voltage\u003c\/td\u003e\n \u003ctd\u003e1000 V AC, 50 Hz, 2 s (winding to winding)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eSolderability\u003c\/td\u003e\n \u003ctd\u003e≥ 99.9% Sn, lead-free, +245°C for 3 seconds\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eResistance to soldering heat\u003c\/td\u003e\n \u003ctd\u003e+260°C for 10 seconds\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eStorage conditions\u003c\/td\u003e\n \u003ctd\u003e–20°C to +40°C, ≤ 75% RH\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eOperating temperature range\u003c\/td\u003e\n \u003ctd\u003e–40°C to +125°C\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eWeight\u003c\/td\u003e\n \u003ctd\u003eApprox. 0.4 g\u003c\/td\u003e\n \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eApplication Circuit and Pinning\u003c\/h3\u003e\n\u003cp\u003eRefer to the datasheet for detailed application circuit diagrams and pin configurations. [Datasheet](https:\/\/www.waldomapac.com\/upload\/parts\/datasheets\/mf-eps\/eps-b82801b0324a040.pdf)\u003c\/p\u003e\n\n\u003ch3\u003eOrdering Codes and Characteristics\u003c\/h3\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n \u003cth\u003eInductance (μH)\u003c\/th\u003e\n \u003cth\u003eTurns ratio N : Ns\u003c\/th\u003e\n \u003cth\u003eDC Resistance R (mΩ)\u003c\/th\u003e\n \u003cth\u003eVoltage-time product V·μs\u003c\/th\u003e\n \u003cth\u003eRecommended R\u003csub\u003eT\u003c\/sub\u003e (Ω)\u003c\/th\u003e\n \u003cth\u003ePart Number\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e80\u003c\/td\u003e\n \u003ctd\u003e1 : 20\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e10.0\u003c\/td\u003e\n \u003ctd\u003e20\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0803A020\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e180\u003c\/td\u003e\n \u003ctd\u003e1 : 30\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e15.0\u003c\/td\u003e\n \u003ctd\u003e30\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0184A030\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e320\u003c\/td\u003e\n \u003ctd\u003e1 : 40\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e20.0\u003c\/td\u003e\n \u003ctd\u003e40\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0324A040\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e500\u003c\/td\u003e\n \u003ctd\u003e1 : 50\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e25.0\u003c\/td\u003e\n \u003ctd\u003e50\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0504A050\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e720\u003c\/td\u003e\n \u003ctd\u003e1 : 60\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e30.0\u003c\/td\u003e\n \u003ctd\u003e60\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0724A060\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e980\u003c\/td\u003e\n \u003ctd\u003e1 : 70\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e35.0\u003c\/td\u003e\n \u003ctd\u003e70\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0984A070\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e2000\u003c\/td\u003e\n \u003ctd\u003e1 : 100\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e50.0\u003c\/td\u003e\n \u003ctd\u003e100\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0205A100\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e3000\u003c\/td\u003e\n \u003ctd\u003e1 : 125\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e62.5\u003c\/td\u003e\n \u003ctd\u003e125\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0305A125\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e8000\u003c\/td\u003e\n \u003ctd\u003e1 : 200\u003c\/td\u003e\n \u003ctd\u003e0.6\u003c\/td\u003e\n \u003ctd\u003e100.0\u003c\/td\u003e\n \u003ctd\u003e200\u003c\/td\u003e\n \u003ctd\u003e\u003ca href=\"#\"\u003eB82801B0925A200\u003c\/a\u003e\u003c\/td\u003e\n \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eDisclaimers\u003c\/h3\u003e\n\u003cp\u003ePlease review the cautions and warnings in the datasheet before use. For more detailed specifications and application notes, refer to the \u003ca href=\"https:\/\/www.waldomapac.com\/upload\/parts\/datasheets\/mf-eps\/eps-b82801b0324a040.pdf\"\u003edatasheet\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003eNote: Datasheet was not processed; please search the internet for the part number for more details.\u003c\/p\u003e"}
