LR1F1K21 Equivalent & Substitute Parts

Part Overview

The LR1F1K21 is a 1.21 kOhms ±1% 0.6W through-hole resistor manufactured by TE Connectivity Passive Product in the Neohm series. This axial metal film resistor is designed for general-purpose applications requiring precision tolerance and stable performance across industrial temperature ranges. The part maintains Active product status with full RoHS3 compliance and REACH unaffected designation. Substitute parts are identified to provide alternative sourcing options when primary inventory is unavailable or when procurement requirements necessitate alternative manufacturers.

Substiute Parts

LR1F1K21

TE Connectivity Passive ProductIn Stock: 1110LR1F1K21 Datasheet

Current PartRFQ

MRS25000C1211FRP00

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 18051MRS25000C1211FRP00 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LR1F1K21 is determined by strict equivalence across the following critical parameters:

• Resistance Value: 1.21 kOhms (exact match required)
• Tolerance: ±1% (exact match required)
• Power Rating: 0.6W (exact match required)
• Composition: Metal Film (exact match required)
• Temperature Coefficient: ±50ppm/°C (exact match required)
• Operating Temperature Range: -55°C ~ 155°C (exact match required)
• Package Configuration: Axial through-hole (exact match required)
• Termination Count: 2 (exact match required)
• Compliance Standards: RoHS3 Compliant, REACH Unaffected (exact match required)

The MRS25000C1211FRP00 meets all substitution criteria and is classified as a direct equivalent. Physical dimensions vary slightly between manufacturers but remain within acceptable tolerances for standard through-hole PCB applications.

Parameter Comparison

Engineering Selection Recommendations

Both the LR1F1K21 and MRS25000C1211FRP00 are Active status products with identical electrical specifications and full regulatory compliance. Selection between these parts is based on procurement and inventory considerations rather than technical performance differences.

The LR1F1K21 (TE Connectivity Neohm series) is suitable for applications where Tape & Box packaging is preferred or when TE Connectivity supply chain integration is required. Current inventory status shows 1007 pieces available.

The MRS25000C1211FRP00 (Vishay Beyschlag MRS25 series) is suitable for high-volume production environments where Tape & Reel packaging is standard. Current inventory status shows 17945 pieces available, providing extended supply availability.

Both parts satisfy RoHS3 compliance and REACH unaffected requirements for regulated markets. Physical dimension variations between the two axial packages are minor and do not affect standard through-hole PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can MRS25000C1211FRP00 be used as a direct replacement for LR1F1K21?

A: Yes. Both parts are electrically identical with matching resistance value (1.21 kOhms), tolerance (±1%), power rating (0.6W), temperature coefficient (±50ppm/°C), and operating temperature range (-55°C ~ 155°C). Both are metal film axial resistors with two terminations and identical compliance certifications.

Q: What are the physical dimension differences between these parts?

A: The LR1F1K21 measures 0.091" diameter x 0.244" length (2.30mm x 6.20mm). The MRS25000C1211FRP00 measures 0.098" diameter x 0.256" length (2.50mm x 6.50mm). These minor variations do not affect standard through-hole PCB assembly compatibility.

Q: Do packaging format differences affect substitution?

A: The LR1F1K21 is supplied in Tape & Box (TB) format while the MRS25000C1211FRP00 is supplied in Tape & Reel (TR) format. Both formats are compatible with standard PCB assembly equipment. Format selection depends on production volume and assembly line configuration requirements.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the LR1F1K21 and MRS25000C1211FRP00 are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for restricted substance use in electronic components.

Q: What is the temperature coefficient specification and why is it important?

A: Both parts have a temperature coefficient of ±50ppm/°C, meaning the resistance value changes by a maximum of 50 parts per million for each degree Celsius change in operating temperature. This specification ensures stable performance across the -55°C ~ 155°C operating range and is critical for precision applications.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. The electrical and mechanical specifications are equivalent. PCB layouts designed for either part will accommodate the other without circuit performance impact. Minor physical dimension differences do not require design modifications for standard through-hole applications.