Part Number: Y78B44124FP
Manufacturer: Littelfuse / C&K COMPONENTS
Country of Origin: France (FR)
Unit of Measure: Each (EA)
ECCN: EAR99
Package Type: Reel
Datasheet: KMR4 Series Datasheet
Product Features
Microminiature SMT top actuated switch with small footprint
Available with 4 actuation forces for versatile applications
Provides an excellent tactile feel even in harsh environments
Ultra-low current capabilities suitable for sensitive electronic circuits
IP40 rated for protection against dust and limited ingress
Long-lasting with an operational life of up to 300,000 cycles depending on model
Electrical Characteristics
Maximum Power
1 VA (Silver contacts), 0.2 VA (Gold contacts)
Maximum Voltage
32 VDC
Minimum Voltage
20 mVDC
Maximum Current
50 mA (Silver), 10 mA (Gold)
Minimum Current
1 mA (standard), 1µA at 1.8 VDC for ULC version
Dielectric Strength
≥ 250 Vrms
Contact Resistance
≤ 100 mΩ
Insulation Resistance
≥ 1 GΩ
Bounce Time
≤ 3 ms
Environmental Characteristics
Operating Temperature: -40°C to 85°C (Silver), -40°C to 125°C (Gold)
Storage Temperature: -55°C to 85°C (Silver), -55°C to 125°C (Gold)
Mechanical Characteristics
Type
Operation Force (N)
Operation Life (cycles)
Travel (mm)
KMR411 / KMR413
1.2 (120 g)
100,000
0.20
KMR421 / KMR423
2.0 (200 g)
100,000
0.25
KMR431 / KMR432
3.0 (300 g)
100,000 / 300,000
0.25
KMR441 / KMR442
4.0 (400 g)
100,000 / 200,000
0.30
Additional Details
Package includes reel for automated placement
Available with ground pin (G) or no ground pin (NG) options
For more detailed specifications, please refer to the KMR4 Series Datasheet. Please note that specifications are subject to change without notice. For custom configurations or specific requirements, contact Littelfuse / C&K COMPONENTS customer service.
Disclaimer: This datasheet does not provide enough information for applications that require a certain level of quality or safety such as automotive, medical systems, or safety equipment. Please contact customer service for the contractual specification package.
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{"id":10027968430397,"title":"Y78B44124FP","handle":"y78b44124fp","description":"\u003ch3\u003eY78B44124FP Tactile Switches Tact - Littelfuse \/ C\u0026amp;K COMPONENTS\u003c\/h3\u003e\n\u003cp\u003ePart Number: Y78B44124FP\u003cbr\u003e\nManufacturer: Littelfuse \/ C\u0026amp;K COMPONENTS\u003cbr\u003e\nCountry of Origin: France (FR)\u003cbr\u003e\nUnit of Measure: Each (EA)\u003cbr\u003e\nECCN: EAR99\u003cbr\u003e\nPackage Type: Reel\u003cbr\u003e\nDatasheet: \u003ca href=\"https:\/\/ckswitches.com\/media\/1480\/kmr4.pdf\" target=\"_blank\"\u003eKMR4 Series Datasheet\u003c\/a\u003e\u003c\/p\u003e\n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eMicrominiature SMT top actuated switch with small footprint\u003c\/li\u003e\n \u003cli\u003eAvailable with 4 actuation forces for versatile applications\u003c\/li\u003e\n \u003cli\u003eProvides an excellent tactile feel even in harsh environments\u003c\/li\u003e\n \u003cli\u003eUltra-low current capabilities suitable for sensitive electronic circuits\u003c\/li\u003e\n \u003cli\u003eIP40 rated for protection against dust and limited ingress\u003c\/li\u003e\n \u003cli\u003eLong-lasting with an operational life of up to 300,000 cycles depending on model\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eElectrical Characteristics\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"5\" cellspacing=\"0\"\u003e\n \u003ctr\u003e\n \u003cth\u003eMaximum Power\u003c\/th\u003e\n \u003ctd\u003e1 VA (Silver contacts), 0.2 VA (Gold contacts)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003cth\u003eMaximum Voltage\u003c\/th\u003e\n \u003ctd\u003e32 VDC\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003cth\u003eMinimum Voltage\u003c\/th\u003e\n \u003ctd\u003e20 mVDC\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003cth\u003eMaximum Current\u003c\/th\u003e\n \u003ctd\u003e50 mA (Silver), 10 mA (Gold)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003cth\u003eMinimum Current\u003c\/th\u003e\n \u003ctd\u003e1 mA (standard), 1µA at 1.8 VDC for ULC version\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003cth\u003eDielectric Strength\u003c\/th\u003e\n \u003ctd\u003e≥ 250 Vrms\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003cth\u003eContact Resistance\u003c\/th\u003e\n \u003ctd\u003e≤ 100 mΩ\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003cth\u003eInsulation Resistance\u003c\/th\u003e\n \u003ctd\u003e≥ 1 GΩ\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003cth\u003eBounce Time\u003c\/th\u003e\n \u003ctd\u003e≤ 3 ms\u003c\/td\u003e\n \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eEnvironmental Characteristics\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eOperating Temperature: -40°C to 85°C (Silver), -40°C to 125°C (Gold)\u003c\/li\u003e\n \u003cli\u003eStorage Temperature: -55°C to 85°C (Silver), -55°C to 125°C (Gold)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMechanical Characteristics\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"5\" cellspacing=\"0\"\u003e\n \u003ctr\u003e\n \u003cth\u003eType\u003c\/th\u003e\n \u003cth\u003eOperation Force (N)\u003c\/th\u003e\n \u003cth\u003eOperation Life (cycles)\u003c\/th\u003e\n \u003cth\u003eTravel (mm)\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eKMR411 \/ KMR413\u003c\/td\u003e\n \u003ctd\u003e1.2 (120 g)\u003c\/td\u003e\n \u003ctd\u003e100,000\u003c\/td\u003e\n \u003ctd\u003e0.20\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eKMR421 \/ KMR423\u003c\/td\u003e\n \u003ctd\u003e2.0 (200 g)\u003c\/td\u003e\n \u003ctd\u003e100,000\u003c\/td\u003e\n \u003ctd\u003e0.25\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eKMR431 \/ KMR432\u003c\/td\u003e\n \u003ctd\u003e3.0 (300 g)\u003c\/td\u003e\n \u003ctd\u003e100,000 \/ 300,000\u003c\/td\u003e\n \u003ctd\u003e0.25\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eKMR441 \/ KMR442\u003c\/td\u003e\n \u003ctd\u003e4.0 (400 g)\u003c\/td\u003e\n \u003ctd\u003e100,000 \/ 200,000\u003c\/td\u003e\n \u003ctd\u003e0.30\u003c\/td\u003e\n \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eAdditional Details\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003ePackage includes reel for automated placement\u003c\/li\u003e\n \u003cli\u003eAvailable with ground pin (G) or no ground pin (NG) options\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more detailed specifications, please refer to the \u003ca href=\"https:\/\/ckswitches.com\/media\/1480\/kmr4.pdf\" target=\"_blank\"\u003eKMR4 Series Datasheet\u003c\/a\u003e. Please note that specifications are subject to change without notice. For custom configurations or specific requirements, contact Littelfuse \/ C\u0026amp;K COMPONENTS customer service.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDisclaimer:\u003c\/strong\u003e This datasheet does not provide enough information for applications that require a certain level of quality or safety such as automotive, medical systems, or safety equipment. Please contact customer service for the contractual specification package.\u003c\/p\u003e\u003cbr\u003e","published_at":"2025-08-16T05:20:56+05:30","created_at":"2025-08-16T05:20:56+05:30","vendor":"Waldom Electonics","type":"","tags":["IMPORT_CSV","IMPORT_PT2","LITTE-CKCO","Switch","WLDM"],"price":4989,"price_min":4989,"price_max":4989,"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":50626368012605,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"Y78B44124FP","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"Y78B44124FP","public_title":null,"options":["Default Title"],"price":4989,"weight":250,"compare_at_price":null,"inventory_management":"shopify","barcode":"Y78B44124FP","requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/thinkrobotics.com\/cdn\/shop\/files\/11132758.png?v=1755301858"],"featured_image":"\/\/thinkrobotics.com\/cdn\/shop\/files\/11132758.png?v=1755301858","options":["Title"],"media":[{"alt":null,"id":45862582550845,"position":1,"preview_image":{"aspect_ratio":1.0,"height":400,"width":400,"src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/11132758.png?v=1755301858"},"aspect_ratio":1.0,"height":400,"media_type":"image","src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/11132758.png?v=1755301858","width":400}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch3\u003eY78B44124FP Tactile Switches Tact - Littelfuse \/ C\u0026amp;K COMPONENTS\u003c\/h3\u003e\n\u003cp\u003ePart Number: Y78B44124FP\u003cbr\u003e\nManufacturer: Littelfuse \/ C\u0026amp;K COMPONENTS\u003cbr\u003e\nCountry of Origin: France (FR)\u003cbr\u003e\nUnit of Measure: Each (EA)\u003cbr\u003e\nECCN: EAR99\u003cbr\u003e\nPackage Type: Reel\u003cbr\u003e\nDatasheet: \u003ca href=\"https:\/\/ckswitches.com\/media\/1480\/kmr4.pdf\" target=\"_blank\"\u003eKMR4 Series Datasheet\u003c\/a\u003e\u003c\/p\u003e\n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eMicrominiature SMT top actuated switch with small footprint\u003c\/li\u003e\n \u003cli\u003eAvailable with 4 actuation forces for versatile applications\u003c\/li\u003e\n \u003cli\u003eProvides an excellent tactile feel even in harsh environments\u003c\/li\u003e\n \u003cli\u003eUltra-low current capabilities suitable for sensitive electronic circuits\u003c\/li\u003e\n \u003cli\u003eIP40 rated for protection against dust and limited ingress\u003c\/li\u003e\n \u003cli\u003eLong-lasting with an operational life of up to 300,000 cycles depending on model\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eElectrical Characteristics\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"5\" cellspacing=\"0\"\u003e\n \u003ctr\u003e\n \u003cth\u003eMaximum Power\u003c\/th\u003e\n \u003ctd\u003e1 VA (Silver contacts), 0.2 VA (Gold contacts)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003cth\u003eMaximum Voltage\u003c\/th\u003e\n \u003ctd\u003e32 VDC\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003cth\u003eMinimum Voltage\u003c\/th\u003e\n \u003ctd\u003e20 mVDC\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003cth\u003eMaximum Current\u003c\/th\u003e\n \u003ctd\u003e50 mA (Silver), 10 mA (Gold)\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003cth\u003eMinimum Current\u003c\/th\u003e\n \u003ctd\u003e1 mA (standard), 1µA at 1.8 VDC for ULC version\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003cth\u003eDielectric Strength\u003c\/th\u003e\n \u003ctd\u003e≥ 250 Vrms\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003cth\u003eContact Resistance\u003c\/th\u003e\n \u003ctd\u003e≤ 100 mΩ\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003cth\u003eInsulation Resistance\u003c\/th\u003e\n \u003ctd\u003e≥ 1 GΩ\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003cth\u003eBounce Time\u003c\/th\u003e\n \u003ctd\u003e≤ 3 ms\u003c\/td\u003e\n \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eEnvironmental Characteristics\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eOperating Temperature: -40°C to 85°C (Silver), -40°C to 125°C (Gold)\u003c\/li\u003e\n \u003cli\u003eStorage Temperature: -55°C to 85°C (Silver), -55°C to 125°C (Gold)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMechanical Characteristics\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"5\" cellspacing=\"0\"\u003e\n \u003ctr\u003e\n \u003cth\u003eType\u003c\/th\u003e\n \u003cth\u003eOperation Force (N)\u003c\/th\u003e\n \u003cth\u003eOperation Life (cycles)\u003c\/th\u003e\n \u003cth\u003eTravel (mm)\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eKMR411 \/ KMR413\u003c\/td\u003e\n \u003ctd\u003e1.2 (120 g)\u003c\/td\u003e\n \u003ctd\u003e100,000\u003c\/td\u003e\n \u003ctd\u003e0.20\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eKMR421 \/ KMR423\u003c\/td\u003e\n \u003ctd\u003e2.0 (200 g)\u003c\/td\u003e\n \u003ctd\u003e100,000\u003c\/td\u003e\n \u003ctd\u003e0.25\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eKMR431 \/ KMR432\u003c\/td\u003e\n \u003ctd\u003e3.0 (300 g)\u003c\/td\u003e\n \u003ctd\u003e100,000 \/ 300,000\u003c\/td\u003e\n \u003ctd\u003e0.25\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eKMR441 \/ KMR442\u003c\/td\u003e\n \u003ctd\u003e4.0 (400 g)\u003c\/td\u003e\n \u003ctd\u003e100,000 \/ 200,000\u003c\/td\u003e\n \u003ctd\u003e0.30\u003c\/td\u003e\n \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eAdditional Details\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003ePackage includes reel for automated placement\u003c\/li\u003e\n \u003cli\u003eAvailable with ground pin (G) or no ground pin (NG) options\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more detailed specifications, please refer to the \u003ca href=\"https:\/\/ckswitches.com\/media\/1480\/kmr4.pdf\" target=\"_blank\"\u003eKMR4 Series Datasheet\u003c\/a\u003e. Please note that specifications are subject to change without notice. For custom configurations or specific requirements, contact Littelfuse \/ C\u0026amp;K COMPONENTS customer service.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDisclaimer:\u003c\/strong\u003e This datasheet does not provide enough information for applications that require a certain level of quality or safety such as automotive, medical systems, or safety equipment. Please contact customer service for the contractual specification package.\u003c\/p\u003e\u003cbr\u003e"}
