RSMF3JB1K00 Equivalent & Substitute Parts

Part Overview

The RSMF3JB1K00 is a 1 kOhms ±5% 3W through hole resistor manufactured by Stackpole Electronics Inc. This axial metal oxide film resistor features flame proof and safety characteristics, designed for applications requiring reliable power dissipation in the 3W range. The part is currently active in production with 1131 pieces in stock. Substitute parts become necessary when design requirements shift toward higher power ratings, alternative packaging formats, or when primary inventory becomes unavailable.

Substiute Parts

RSMF3JB1K00

Stackpole Electronics IncIn Stock: 1226RSMF3JB1K00 Datasheet

Current PartRFQ

SQP500JB-1K

YAGEOIn Stock: 2255SQP500JB-1K Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SQP500JB-1K qualifies as a substitute for the RSMF3JB1K00 based on the following matching parameters:

• Resistance value: 1 kOhms (identical)
• Tolerance: ±5% (identical)
• Package type: Axial (identical)
• Termination count: 2 (identical)
• RoHS compliance: ROHS3 Compliant (identical)
• REACH status: REACH Unaffected (identical)
• ECCN classification: EAR99 (identical)

The SQP500JB-1K differs in power rating (5W versus 3W), composition (Cement versus Metal Oxide Film), and operating temperature range (-55°C ~ 155°C versus -55°C ~ 235°C). These differences establish the substitution as a higher-capacity alternative suitable for applications requiring increased power dissipation or pulse withstanding capability.

Parameter Comparison

Engineering Selection Recommendations

Both the RSMF3JB1K00 and SQP500JB-1K maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for industrial and commercial applications. The RSMF3JB1K00 is the primary choice for circuits operating within the 3W power dissipation envelope and requiring the extended upper temperature limit of 235°C. The SQP500JB-1K serves as a substitute when circuit design requires 5W power handling capability or when the RSMF3JB1K00 becomes unavailable. The SQP500JB-1K's maximum operating temperature of 155°C limits its use in high-temperature applications. Selection between these parts depends on the specific thermal and power requirements of the target application.

Frequently Asked Questions (FAQ)

Can the SQP500JB-1K replace the RSMF3JB1K00 in all applications?

The SQP500JB-1K matches the RSMF3JB1K00 in resistance value, tolerance, and axial package configuration. However, applications requiring operation above 155°C must use the RSMF3JB1K00 due to its extended temperature range to 235°C. Applications with power dissipation below 3W can use either part.

What are the physical dimension differences between these parts?

The RSMF3JB1K00 measures 0.217" diameter by 0.591" length (5.50mm x 15.00mm). The SQP500JB-1K measures 0.374" x 0.354" rectangular by 0.866" length (9.50mm x 9.00mm x 22.00mm). The SQP500JB-1K is physically larger due to its higher power rating.

Are there composition differences that affect circuit performance?

The RSMF3JB1K00 uses metal oxide film composition while the SQP500JB-1K uses cement composition. Both maintain ±5% tolerance and identical resistance values. The composition difference reflects the different power handling approaches between the two designs.

Which part should be selected for new designs?

For new designs, select based on the actual power dissipation requirement. If the circuit dissipates 3W or less, either part is acceptable provided the operating temperature does not exceed 155°C. If operating temperature exceeds 155°C, the RSMF3JB1K00 is required.

Do packaging differences affect circuit board layout?

The RSMF3JB1K00 comes in bulk packaging while the SQP500JB-1K comes in tray packaging. Both are axial through-hole components with identical lead spacing and termination configuration, so they use the same PCB footprint and hole pattern.