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EPCOS
B57703M0303G040
EPS B57703M0303G040 - Thermistor NTC 30KΩ 3964K with Ring Lug
The EPCOS B57703M0303G040 is a high-precision NTC thermistor designed for accurate temperature measurement applications. Encapsulated in a metal-tag case with a ring lug, this thermistor ensures excellent thermal coupling and reliable mounting, making it ideal for surface temperature monitoring on housings and heat sinks.
Product Features
High accuracy temperature sensing
Easy mounting with metal-tag encapsulation
Good thermal coupling through metal tag
UL approved (E69802)
Flexible lead options: AWG 30 PTFE-insulated silver-plated nickel wire or AWG 26 PTFE-insulated silver-plated copper wire
Bulk delivery mode
Technical Specifications
Part Number: B57703M0303G040
Manufacturer: EPCOS
Country of Origin: Indonesia (ID)
Product Type: Resistors | Non-linear Resistors
Package Type: Black (BLK)
UOM: Each (EA)
ECCN: EAR99
RoHS Compliant: Yes
Datasheet: Download Datasheet
Electrical and Mechanical Data
Resistance Rating
Resistance Tolerance
Wire Length (mm)
Wire Type
Ordering Code
30KΩ
±1%
45 ±3
AWG 30 PTFE-insulated silver-plated nickel wire
B57703M0303G040
Reliability Data
Test
Standard
Test Conditions
∆R / R 25 (typical)
Remarks
Storage in dry heat
IEC 60068-2-2
125°C for 1000 hours
< 1%
No visible damage
Storage in damp heat
IEC 60068-2-78
40°C, 93% RH, 56 days
< 1%
No visible damage
Rapid temperature cycling
IEC 60068-2-14
55°C to 125°C, 10 cycles
< 0.5%
No visible damage
Endurance
-
150mW, 1000 hours
< 1%
-
Long-term stability
-
70°C, 10,000 hours
< 2%
-
R/T Characteristics
Temperature (°C)
Resistance Ratio R/R25
Alpha (%/K)
0.0
96.3
7.4
25.0
100.0
7.2
55.0
47.17
6.9
125.0
30.235
4.1
150.0
16.53
4.4
For more detailed technical information, please refer to the Datasheet .
Note: Contact with liquids and solvents should be avoided. Ensure no water ingress or condensation unless specified for such conditions.
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{"id":10026691920189,"title":"B57703M0303G040","handle":"b57703m0303g040","description":"\u003ch3\u003eEPS B57703M0303G040 - Thermistor NTC 30KΩ 3964K with Ring Lug\u003c\/h3\u003e\n\n\u003cp\u003eThe EPCOS B57703M0303G040 is a high-precision NTC thermistor designed for accurate temperature measurement applications. Encapsulated in a metal-tag case with a ring lug, this thermistor ensures excellent thermal coupling and reliable mounting, making it ideal for surface temperature monitoring on housings and heat sinks.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eHigh accuracy temperature sensing\u003c\/li\u003e\n \u003cli\u003eEasy mounting with metal-tag encapsulation\u003c\/li\u003e\n \u003cli\u003eGood thermal coupling through metal tag\u003c\/li\u003e\n \u003cli\u003eUL approved (E69802)\u003c\/li\u003e\n \u003cli\u003eFlexible lead options: AWG 30 PTFE-insulated silver-plated nickel wire or AWG 26 PTFE-insulated silver-plated copper wire\u003c\/li\u003e\n \u003cli\u003eBulk delivery mode\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003ePart Number: B57703M0303G040\u003c\/li\u003e\n \u003cli\u003eManufacturer: EPCOS\u003c\/li\u003e\n \u003cli\u003eCountry of Origin: Indonesia (ID)\u003c\/li\u003e\n \u003cli\u003eProduct Type: Resistors | Non-linear Resistors\u003c\/li\u003e\n \u003cli\u003ePackage Type: Black (BLK)\u003c\/li\u003e\n \u003cli\u003eUOM: Each (EA)\u003c\/li\u003e\n \u003cli\u003eECCN: EAR99\u003c\/li\u003e\n \u003cli\u003eRoHS Compliant: Yes\u003c\/li\u003e\n \u003cli\u003eDatasheet: \u003ca href=\"https:\/\/www.waldomapac.com\/upload\/parts\/datasheets\/mf-eps\/eps-b57703m0303g040.pdf\" target=\"_blank\"\u003eDownload Datasheet\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eElectrical and Mechanical Data\u003c\/h3\u003e\n\u003ctable\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eResistance Rating\u003c\/th\u003e\n \u003cth\u003eResistance Tolerance\u003c\/th\u003e\n \u003cth\u003eWire Length (mm)\u003c\/th\u003e\n \u003cth\u003eWire Type\u003c\/th\u003e\n \u003cth\u003eOrdering Code\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e30KΩ\u003c\/td\u003e\n \u003ctd\u003e±1%\u003c\/td\u003e\n \u003ctd\u003e45 ±3\u003c\/td\u003e\n \u003ctd\u003eAWG 30 PTFE-insulated silver-plated nickel wire\u003c\/td\u003e\n \u003ctd\u003eB57703M0303G040\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eReliability Data\u003c\/h3\u003e\n\u003ctable\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eTest\u003c\/th\u003e\n \u003cth\u003eStandard\u003c\/th\u003e\n \u003cth\u003eTest Conditions\u003c\/th\u003e\n \u003cth\u003e∆R \/ R 25 (typical)\u003c\/th\u003e\n \u003cth\u003eRemarks\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eStorage in dry heat\u003c\/td\u003e\n \u003ctd\u003eIEC 60068-2-2\u003c\/td\u003e\n \u003ctd\u003e125°C for 1000 hours\u003c\/td\u003e\n \u003ctd\u003e\u0026lt; 1%\u003c\/td\u003e\n \u003ctd\u003eNo visible damage\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eStorage in damp heat\u003c\/td\u003e\n \u003ctd\u003eIEC 60068-2-78\u003c\/td\u003e\n \u003ctd\u003e40°C, 93% RH, 56 days\u003c\/td\u003e\n \u003ctd\u003e\u0026lt; 1%\u003c\/td\u003e\n \u003ctd\u003eNo visible damage\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eRapid temperature cycling\u003c\/td\u003e\n \u003ctd\u003eIEC 60068-2-14\u003c\/td\u003e\n \u003ctd\u003e55°C to 125°C, 10 cycles\u003c\/td\u003e\n \u003ctd\u003e\u0026lt; 0.5%\u003c\/td\u003e\n \u003ctd\u003eNo visible damage\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eEndurance\u003c\/td\u003e\n \u003ctd\u003e-\u003c\/td\u003e\n \u003ctd\u003e150mW, 1000 hours\u003c\/td\u003e\n \u003ctd\u003e\u0026lt; 1%\u003c\/td\u003e\n \u003ctd\u003e-\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eLong-term stability\u003c\/td\u003e\n \u003ctd\u003e-\u003c\/td\u003e\n \u003ctd\u003e70°C, 10,000 hours\u003c\/td\u003e\n \u003ctd\u003e\u0026lt; 2%\u003c\/td\u003e\n \u003ctd\u003e-\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eR\/T Characteristics\u003c\/h3\u003e\n\u003ctable\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eTemperature (°C)\u003c\/th\u003e\n \u003cth\u003eResistance Ratio R\/R25\u003c\/th\u003e\n \u003cth\u003eAlpha (%\/K)\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e0.0\u003c\/td\u003e\n \u003ctd\u003e96.3\u003c\/td\u003e\n \u003ctd\u003e7.4\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e25.0\u003c\/td\u003e\n \u003ctd\u003e100.0\u003c\/td\u003e\n \u003ctd\u003e7.2\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e55.0\u003c\/td\u003e\n \u003ctd\u003e47.17\u003c\/td\u003e\n \u003ctd\u003e6.9\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e125.0\u003c\/td\u003e\n \u003ctd\u003e30.235\u003c\/td\u003e\n \u003ctd\u003e4.1\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e150.0\u003c\/td\u003e\n \u003ctd\u003e16.53\u003c\/td\u003e\n \u003ctd\u003e4.4\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eFor more detailed technical information, please refer to the \u003ca href=\"https:\/\/www.waldomapac.com\/upload\/parts\/datasheets\/mf-eps\/eps-b57703m0303g040.pdf\" target=\"_blank\"\u003eDatasheet\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Contact with liquids and solvents should be avoided. Ensure no water ingress or condensation unless specified for such conditions.\u003c\/p\u003e\u003cbr\u003e","published_at":"2025-08-15T13:41:38+05:30","created_at":"2025-08-15T13:41:39+05:30","vendor":"Waldom Electonics","type":"Resistors","tags":["EPCOS","IMPORT_CSV","IMPORT_PT2","Linear","Non","NTC","Resistors","WLDM"],"price":50170,"price_min":50170,"price_max":50170,"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":50622965711165,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"B57703M0303G040","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"B57703M0303G040","public_title":null,"options":["Default Title"],"price":50170,"weight":250,"compare_at_price":null,"inventory_management":"shopify","barcode":"B57703M0303G040","requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/thinkrobotics.com\/cdn\/shop\/files\/53135649.jpg?v=1755245499"],"featured_image":"\/\/thinkrobotics.com\/cdn\/shop\/files\/53135649.jpg?v=1755245499","options":["Title"],"media":[{"alt":null,"id":45851061092669,"position":1,"preview_image":{"aspect_ratio":1.0,"height":420,"width":420,"src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/53135649.jpg?v=1755245499"},"aspect_ratio":1.0,"height":420,"media_type":"image","src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/53135649.jpg?v=1755245499","width":420}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch3\u003eEPS B57703M0303G040 - Thermistor NTC 30KΩ 3964K with Ring Lug\u003c\/h3\u003e\n\n\u003cp\u003eThe EPCOS B57703M0303G040 is a high-precision NTC thermistor designed for accurate temperature measurement applications. Encapsulated in a metal-tag case with a ring lug, this thermistor ensures excellent thermal coupling and reliable mounting, making it ideal for surface temperature monitoring on housings and heat sinks.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003eHigh accuracy temperature sensing\u003c\/li\u003e\n \u003cli\u003eEasy mounting with metal-tag encapsulation\u003c\/li\u003e\n \u003cli\u003eGood thermal coupling through metal tag\u003c\/li\u003e\n \u003cli\u003eUL approved (E69802)\u003c\/li\u003e\n \u003cli\u003eFlexible lead options: AWG 30 PTFE-insulated silver-plated nickel wire or AWG 26 PTFE-insulated silver-plated copper wire\u003c\/li\u003e\n \u003cli\u003eBulk delivery mode\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n \u003cli\u003ePart Number: B57703M0303G040\u003c\/li\u003e\n \u003cli\u003eManufacturer: EPCOS\u003c\/li\u003e\n \u003cli\u003eCountry of Origin: Indonesia (ID)\u003c\/li\u003e\n \u003cli\u003eProduct Type: Resistors | Non-linear Resistors\u003c\/li\u003e\n \u003cli\u003ePackage Type: Black (BLK)\u003c\/li\u003e\n \u003cli\u003eUOM: Each (EA)\u003c\/li\u003e\n \u003cli\u003eECCN: EAR99\u003c\/li\u003e\n \u003cli\u003eRoHS Compliant: Yes\u003c\/li\u003e\n \u003cli\u003eDatasheet: \u003ca href=\"https:\/\/www.waldomapac.com\/upload\/parts\/datasheets\/mf-eps\/eps-b57703m0303g040.pdf\" target=\"_blank\"\u003eDownload Datasheet\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eElectrical and Mechanical Data\u003c\/h3\u003e\n\u003ctable\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eResistance Rating\u003c\/th\u003e\n \u003cth\u003eResistance Tolerance\u003c\/th\u003e\n \u003cth\u003eWire Length (mm)\u003c\/th\u003e\n \u003cth\u003eWire Type\u003c\/th\u003e\n \u003cth\u003eOrdering Code\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e30KΩ\u003c\/td\u003e\n \u003ctd\u003e±1%\u003c\/td\u003e\n \u003ctd\u003e45 ±3\u003c\/td\u003e\n \u003ctd\u003eAWG 30 PTFE-insulated silver-plated nickel wire\u003c\/td\u003e\n \u003ctd\u003eB57703M0303G040\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eReliability Data\u003c\/h3\u003e\n\u003ctable\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eTest\u003c\/th\u003e\n \u003cth\u003eStandard\u003c\/th\u003e\n \u003cth\u003eTest Conditions\u003c\/th\u003e\n \u003cth\u003e∆R \/ R 25 (typical)\u003c\/th\u003e\n \u003cth\u003eRemarks\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eStorage in dry heat\u003c\/td\u003e\n \u003ctd\u003eIEC 60068-2-2\u003c\/td\u003e\n \u003ctd\u003e125°C for 1000 hours\u003c\/td\u003e\n \u003ctd\u003e\u0026lt; 1%\u003c\/td\u003e\n \u003ctd\u003eNo visible damage\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eStorage in damp heat\u003c\/td\u003e\n \u003ctd\u003eIEC 60068-2-78\u003c\/td\u003e\n \u003ctd\u003e40°C, 93% RH, 56 days\u003c\/td\u003e\n \u003ctd\u003e\u0026lt; 1%\u003c\/td\u003e\n \u003ctd\u003eNo visible damage\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eRapid temperature cycling\u003c\/td\u003e\n \u003ctd\u003eIEC 60068-2-14\u003c\/td\u003e\n \u003ctd\u003e55°C to 125°C, 10 cycles\u003c\/td\u003e\n \u003ctd\u003e\u0026lt; 0.5%\u003c\/td\u003e\n \u003ctd\u003eNo visible damage\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eEndurance\u003c\/td\u003e\n \u003ctd\u003e-\u003c\/td\u003e\n \u003ctd\u003e150mW, 1000 hours\u003c\/td\u003e\n \u003ctd\u003e\u0026lt; 1%\u003c\/td\u003e\n \u003ctd\u003e-\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eLong-term stability\u003c\/td\u003e\n \u003ctd\u003e-\u003c\/td\u003e\n \u003ctd\u003e70°C, 10,000 hours\u003c\/td\u003e\n \u003ctd\u003e\u0026lt; 2%\u003c\/td\u003e\n \u003ctd\u003e-\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eR\/T Characteristics\u003c\/h3\u003e\n\u003ctable\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eTemperature (°C)\u003c\/th\u003e\n \u003cth\u003eResistance Ratio R\/R25\u003c\/th\u003e\n \u003cth\u003eAlpha (%\/K)\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e0.0\u003c\/td\u003e\n \u003ctd\u003e96.3\u003c\/td\u003e\n \u003ctd\u003e7.4\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e25.0\u003c\/td\u003e\n \u003ctd\u003e100.0\u003c\/td\u003e\n \u003ctd\u003e7.2\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e55.0\u003c\/td\u003e\n \u003ctd\u003e47.17\u003c\/td\u003e\n \u003ctd\u003e6.9\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e125.0\u003c\/td\u003e\n \u003ctd\u003e30.235\u003c\/td\u003e\n \u003ctd\u003e4.1\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003e150.0\u003c\/td\u003e\n \u003ctd\u003e16.53\u003c\/td\u003e\n \u003ctd\u003e4.4\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eFor more detailed technical information, please refer to the \u003ca href=\"https:\/\/www.waldomapac.com\/upload\/parts\/datasheets\/mf-eps\/eps-b57703m0303g040.pdf\" target=\"_blank\"\u003eDatasheet\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Contact with liquids and solvents should be avoided. Ensure no water ingress or condensation unless specified for such conditions.\u003c\/p\u003e\u003cbr\u003e"}
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