RSF100JB-73-39K Equivalent & Substitute Parts

Part Overview

The RSF100JB-73-39K is a 39 kOhms ±5% 1W through-hole axial resistor manufactured by YAGEO. This metal oxide film resistor features flame-proof and safety characteristics, with an operating temperature range of -55°C to 235°C. The part is active and in stock with 974 units available. Substitute parts are identified when equivalent electrical specifications (resistance value, tolerance, power rating) and mechanical compatibility (axial package, through-hole termination) are maintained within allowable parameter variations.

Key Parameters

Parameter	Value
Resistance	39 kOhms
Tolerance	±5%
Power Rating	1W
Composition	Metal Oxide Film
Package Type	Axial
Terminations	2 (Through-Hole)
Operating Temperature Range	-55°C ~ 235°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the RSF100JB-73-39K are qualified based on the following criteria:

Electrical Equivalence: All substitute parts maintain the same resistance value (39 kOhms) and tolerance (±5%), ensuring direct functional replacement in circuit applications.

Power Rating Compatibility: Substitutes are grouped by power rating. The RSF1JT39K0 and ROX1SJ39K maintain the 1W rating for direct pin-compatible replacement. The ROX2SJ39K provides 2W rating, suitable for applications requiring higher power dissipation capability.

Package and Mechanical Compatibility: All substitutes use axial through-hole packaging with 2 terminations, maintaining identical PCB footprint and assembly compatibility.

Composition and Features: All substitutes employ metal oxide film composition with flame-proof or flame-retardant safety features, meeting the same environmental and safety requirements.

Compliance Standards: All substitutes are ROHS3 compliant and carry EAR99 ECCN classification, matching the regulatory status of the main part.

Parameter Comparison

Parameter	RSF100JB-73-39K (Main)	RSF1JT39K0	ROX1SJ39K	ROX2SJ39K
Manufacturer	YAGEO	Stackpole Electronics Inc	TE Connectivity Passive Product	TE Connectivity Passive Product
Resistance	39 kOhms	39 kOhms	39 kOhms	39 kOhms
Tolerance	±5%	±5%	±5%	±5%
Power Rating	1W	1W	1W	2W
Composition	Metal Oxide Film	Metal Oxide Film	Metal Oxide Film	Metal Oxide Film
Package	Axial	Axial	Axial	Axial
Operating Temperature	-55°C ~ 235°C	-55°C ~ 235°C	-55°C ~ 130°C	-55°C ~ 200°C
Temperature Coefficient	Not specified	±200ppm/°C	±350ppm/°C	±350ppm/°C
Size (Diameter x Length)	4.50mm x 11.50mm	4.50mm x 11.00mm	4.60mm x 10.00mm	5.00mm x 12.00mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

RSF1JT39K0 (Stackpole Electronics Inc): This substitute provides identical 1W power rating and operating temperature range (-55°C to 235°C) to the main part. It maintains ROHS3 compliance and REACH Unaffected status. The part is active with 3453 units in stock. Physical dimensions are nearly identical (4.50mm diameter, 11.00mm length versus 11.50mm), ensuring PCB compatibility. Temperature coefficient specification (±200ppm/°C) is tighter than the main part's unspecified value.

ROX1SJ39K (TE Connectivity Passive Product, MFR Recommended): This substitute maintains 1W power rating and axial package compatibility. It is designated as manufacturer-recommended and carries ROHS3 compliance. Operating temperature range is -55°C to 130°C, which is narrower than the main part. Physical dimensions are smaller (4.60mm diameter, 10.00mm length), which may require PCB layout verification for clearance. Temperature coefficient is ±350ppm/°C. Inventory availability is high at 13080 units.

ROX2SJ39K (TE Connectivity Passive Product, Upgrade Option): This substitute provides increased power rating (2W) while maintaining 39 kOhms ±5% resistance and axial package configuration. It is suitable for applications requiring higher power dissipation. Operating temperature range is -55°C to 200°C. Physical dimensions are larger (5.00mm diameter, 12.00mm length), requiring PCB layout verification. ROHS3 compliant with 10360 units in stock.

Frequently Asked Questions (FAQ)

Q: Can ROX2SJ39K be used as a direct replacement for RSF100JB-73-39K?

A: ROX2SJ39K maintains electrical equivalence (39 kOhms ±5%) and axial through-hole package compatibility. The 2W power rating is a superset of the 1W requirement, making it functionally compatible. However, physical dimensions are larger (5.00mm x 12.00mm versus 4.50mm x 11.50mm), requiring verification that PCB layout accommodates the increased size.

Q: What is the difference between RSF1JT39K0 and ROX1SJ39K?

A: Both maintain 1W power rating and 39 kOhms ±5% resistance. RSF1JT39K0 offers identical operating temperature range (-55°C to 235°C) and slightly better temperature coefficient (±200ppm/°C). ROX1SJ39K has a narrower operating temperature range (-55°C to 130°C) and larger temperature coefficient (±350ppm/°C). Physical dimensions differ: RSF1JT39K0 is 4.50mm x 11.00mm; ROX1SJ39K is 4.60mm x 10.00mm.

Q: Are all substitutes ROHS3 compliant?

A: Yes. RSF100JB-73-39K, RSF1JT39K0, ROX1SJ39K, and ROX2SJ39K are all ROHS3 compliant, meeting the same regulatory requirements.

Q: Which substitute has the best temperature stability?

A: RSF1JT39K0 has the tightest temperature coefficient specification at ±200ppm/°C, compared to ±350ppm/°C for ROX1SJ39K and ROX2SJ39K. The main part does not specify a temperature coefficient value.

Q: Can ROX1SJ39K be used in applications requiring the full -55°C to 235°C temperature range?

A: No. ROX1SJ39K is rated only to 130°C maximum, making it unsuitable for applications requiring operation above 130°C. RSF1JT39K0 maintains the full -55°C to 235°C range of the main part.

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