RSF2JB390R Equivalent & Substitute Parts

Part Overview

The RSF2JB390R is a 390 Ohm, 2W through-hole axial resistor manufactured by Stackpole Electronics Inc. This metal oxide film resistor features flame retardant coating and is designed for general-purpose applications requiring stable resistance values across industrial temperature ranges. The part is currently active in production with full RoHS3 compliance. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained within the allowed parameter tolerances for this resistor category.

Substiute Parts

RSF2JB390R

Stackpole Electronics IncIn Stock: 1100RSF2JB390R Datasheet

Current PartRFQ

RSF2JT390R

Stackpole Electronics IncIn Stock: 892RSF2JT390R Datasheet

DirectRFQ

RSMF5JT390R

Stackpole Electronics IncIn Stock: 1052RSMF5JT390R Datasheet

UpgradeRFQ

RSMF2JT390R

Stackpole Electronics IncIn Stock: 7958RSMF2JT390R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RSF2JB390R is determined by the following critical parameters:

• Resistance Value: Must be 390 Ohms
• Tolerance: Must be ±5%
• Power Rating: 2W (primary specification); 5W acceptable as upgrade
• Composition: Metal Oxide Film
• Temperature Coefficient: ±200ppm/°C
• Operating Temperature Range: -55°C ~ 235°C minimum
• Package Type: Axial configuration
• Termination Count: 2-pin through-hole

Substitute parts are grouped into three categories based on packaging format and power rating:

Direct Substitutes (Same Packaging Compatibility): RSF2JT390R maintains identical electrical specifications and axial package dimensions, differing only in supply format (Tape & Reel vs. Bulk).

Manufacturer Recommended Substitute: RSMF2JT390R provides equivalent 2W performance with improved flame-proof rating and reduced physical dimensions, supplied in Cut Tape format with higher inventory availability.

Upgrade Substitute: RSMF5JT390R increases power rating to 5W while maintaining all other electrical parameters, suitable for applications requiring higher thermal margin.

Parameter Comparison

Engineering Selection Recommendations

RSF2JT390R: Select this direct substitute when Tape & Reel packaging is required for automated assembly processes. Electrical and thermal performance are identical to the RSF2JB390R. All regulatory compliance certifications (RoHS3, REACH Unaffected, EAR99) are maintained.

RSMF2JT390R: This manufacturer-recommended substitute is preferred for new designs due to enhanced flame-proof rating and compact physical dimensions (4.50mm x 11.00mm). Cut Tape packaging and superior inventory availability (7,881 units) support production continuity. Electrical specifications remain equivalent to the original part.

RSMF5JT390R: Select this upgrade substitute when circuit design permits increased power dissipation capability. The 5W rating provides thermal margin for applications operating near maximum current limits. Physical dimensions increase to 6.00mm x 17.50mm; verify PCB layout compatibility before selection. All electrical parameters and compliance certifications remain equivalent.

Frequently Asked Questions (FAQ)

Q: Can RSF2JT390R be used as a direct replacement for RSF2JB390R?

A: Yes. Both parts are identical in electrical specifications, temperature performance, and axial package dimensions. The difference is packaging format: RSF2JB390R is supplied in Bulk, while RSF2JT390R is supplied in Tape & Reel. Selection depends on assembly process requirements.

Q: What is the difference between RSMF2JT390R and RSF2JB390R?

A: Both maintain 390 Ohm resistance, ±5% tolerance, and 2W power rating. RSMF2JT390R features improved flame-proof rating (versus flame retardant) and reduced physical dimensions (4.50mm x 11.00mm versus 5.50mm x 15.00mm). All electrical and thermal parameters are equivalent.

Q: When should RSMF5JT390R be selected instead of the 2W alternatives?

A: Select the 5W variant when circuit analysis indicates sustained power dissipation approaching or exceeding 2W, or when thermal margin is required for reliability. The 5W rating does not change resistance, tolerance, or temperature coefficient. Physical size increases; verify PCB layout compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. RSF2JT390R, RSMF2JT390R, and RSMF5JT390R are all RoHS3 compliant and REACH unaffected, matching the compliance status of the original RSF2JB390R.

Q: What packaging formats are available for 390 Ohm 2W axial resistors?

A: The RSF2JB390R series is available in Bulk (RSF2JB390R), Tape & Reel (RSF2JT390R), and Cut Tape (RSMF2JT390R) formats. Selection depends on assembly automation requirements and production volume.