DC101B2K NTC Thermistor Equivalent & Substitute Parts

Part Overview

The DC101B2K is an NTC thermistor manufactured by Littelfuse Inc., featuring a 100 Ohm resistance at 25°C with a bead epoxy package and free hanging mounting configuration. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The thermistor operates up to 100°C and meets ROHS3 compliance requirements. Due to its obsolete status, equivalent active alternatives are necessary to maintain supply chain continuity and ensure long-term component availability.

Substiute Parts

DC101B2K

Littelfuse Inc.In Stock: 893DC101B2K Datasheet

Current PartRFQ

1DA101J-EC

AmethermIn Stock: 11171DA101J-EC Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DC101B2K is determined by the following critical parameters:

• Resistance Value: 100 Ohms at 25°C with ±10% tolerance
• Thermal Characteristics: B-value parameters that define temperature-resistance behavior
• Operating Temperature Range: Minimum capability of 100°C
• Package Compatibility: Physical form factor and mounting method
• Compliance Standards: ROHS3 and REACH requirements

The substitute part 1DA101J-EC from Ametherm meets these core substitution criteria. While the package type differs (disc versus bead), both configurations provide equivalent electrical performance for NTC thermistor applications requiring 100 Ohm nominal resistance and comparable thermal response characteristics.

Parameter Comparison

Engineering Selection Recommendations

The 1DA101J-EC serves as a direct functional substitute for the obsolete DC101B2K based on matching resistance specifications and thermal operating characteristics. Both components maintain ROHS3 compliance and unlimited moisture sensitivity ratings, ensuring regulatory alignment in applications requiring these certifications.

The substitute part offers an extended operating temperature range (−40°C to 150°C versus 100°C maximum), providing additional thermal margin for applications operating near the upper limit of the original component. The active product status of the 1DA101J-EC ensures ongoing availability and manufacturing support, addressing the supply chain limitations of the obsolete DC101B2K.

Physical package differences (disc versus bead configuration) and mounting method variations (through hole versus free hanging) require mechanical integration assessment during component selection. These differences do not affect electrical performance but necessitate PCB layout and mechanical mounting design review.

Frequently Asked Questions (FAQ)

Q: Can the 1DA101J-EC directly replace the DC101B2K without circuit modifications?

A: Electrical substitution is valid based on matching 100 Ohm resistance and comparable thermal response. Mechanical integration requires assessment of PCB mounting provisions, as the substitute uses through-hole mounting versus free hanging configuration.

Q: What is the significance of the B-value difference between the two parts?

A: B-values define the thermistor's temperature-resistance relationship. The DC101B2K B0/50 of 2941K and the 1DA101J-EC B25/50 of 2891K represent similar thermal characteristics within acceptable engineering tolerance for most temperature sensing applications. Specific applications requiring precise B-value matching should conduct thermal curve analysis.

Q: Does the extended operating temperature range of the 1DA101J-EC affect compatibility?

A: The extended range (−40°C to 150°C) is a superset of the original component's 100°C maximum, providing enhanced capability without reducing compatibility. Applications operating within the original 100°C specification remain fully supported.

Q: Are both components suitable for the same environmental and compliance requirements?

A: Both components meet ROHS3 compliance and carry MSL 1 (Unlimited) ratings, ensuring compatibility in applications requiring these certifications. REACH status is unaffected for both parts.

Q: What packaging considerations apply when transitioning from DC101B2K to 1DA101J-EC?

A: The substitute uses disc packaging (2.5mm diameter × 1.5mm width) with through-hole mounting, differing from the bead epoxy free-hanging configuration. PCB design must accommodate the physical dimensions and mounting method of the substitute component.