RSF2JB120K Equivalent & Substitute Parts

Part Overview

The RSF2JB120K is a 120 kOhms ±5% 2W through-hole resistor manufactured by Stackpole Electronics Inc. This metal oxide film axial resistor features flame retardant coating and safety design, operating across a temperature range of -55°C to 235°C. The part maintains Active product status and is ROHS3 compliant. Substitute parts are identified when electrical specifications remain constant while packaging or power ratings may be upgraded to meet specific application requirements or inventory availability.

Substiute Parts

RSF2JB120K

Stackpole Electronics IncIn Stock: 798RSF2JB120K Datasheet

Current PartRFQ

RSMF3JT120K

Stackpole Electronics IncIn Stock: 873RSMF3JT120K Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

The RSMF3JT120K qualifies as a substitute for the RSF2JB120K based on the following criteria:

Matching Parameters:

• Resistance value: 120 kOhms
• Tolerance: ±5%
• Composition: Metal Oxide Film
• Package: Axial
• Temperature Coefficient: ±200ppm/°C
• Operating Temperature Range: -55°C ~ 235°C
• RoHS Status: ROHS3 Compliant

Upgrade Parameter:

• Power Rating: 3W (versus 2W in original part)

The substitute part maintains identical electrical and thermal characteristics while providing increased power dissipation capability. The axial package dimensions remain consistent at 0.217" Dia x 0.591" L (5.50mm x 15.00mm), ensuring mechanical compatibility in existing circuit board layouts.

Parameter Comparison

Engineering Selection Recommendations

Both the RSF2JB120K and RSMF3JT120K are Active products with ROHS3 compliance and REACH unaffected status. Selection between these parts depends on application power dissipation requirements. The RSF2JB120K is suitable for circuits requiring 2W dissipation at 120 kOhms. The RSMF3JT120K provides a 50% increase in power handling capacity while maintaining identical electrical performance and thermal characteristics, making it applicable to higher-power applications or as a design margin upgrade. Both parts are classified under ECCN EAR99 and HTSUS 8533.21.0090.

Frequently Asked Questions (FAQ)

Q: Can RSMF3JT120K replace RSF2JB120K in existing designs?

A: Yes. Both parts share identical resistance, tolerance, temperature coefficient, operating temperature range, and axial package dimensions. The substitute part provides increased power rating (3W versus 2W) without affecting electrical or mechanical compatibility.

Q: What is the difference between these two resistor series?

A: The RSF series (2W) and RSMF series (3W) differ in power dissipation capability. Both utilize metal oxide film composition with flame retardant or flame proof safety features. The RSMF3JT120K features flame proof design compared to the flame retardant coating of the RSF2JB120K.

Q: Are the physical dimensions identical?

A: Yes. Both parts measure 0.217" Dia x 0.591" L (5.50mm x 15.00mm) in axial configuration, ensuring direct mechanical substitution in PCB layouts.

Q: Do these parts have different packaging options?

A: The RSF2JB120K is supplied in Bulk packaging, while the RSMF3JT120K is supplied in Tape & Reel (TR) format. This affects procurement and assembly processes but does not impact component performance.

Q: Are both parts RoHS compliant?

A: Yes. Both the RSF2JB120K and RSMF3JT120K are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.