RSMF3JB680R Equivalent & Substitute Parts

Part Overview

The RSMF3JB680R is a 680 Ohms ±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 harsh thermal environments. The part maintains Active product status with 727 units in current inventory. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the allowed parameter tolerances for this resistor category.

Substiute Parts

RSMF3JB680R

Stackpole Electronics IncIn Stock: 780RSMF3JB680R Datasheet

Current PartRFQ

SQP500JB-680R

YAGEOIn Stock: 2306SQP500JB-680R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SQP500JB-680R qualifies as a substitute for the RSMF3JB680R based on the following critical parameters:

• Resistance value: Both parts are 680 Ohms ±5%
• Package configuration: Both are axial through-hole resistors
• Electrical tolerance: Both maintain ±5% tolerance
• Compliance: Both are ROHS3 Compliant and REACH Unaffected
• Termination count: Both have 2 terminations

Substitution is valid when the application permits a higher power rating (5W vs 3W) and can accommodate the larger physical dimensions of the SQP500JB-680R. The cement composition of the substitute part provides pulse withstanding capability not present in the metal oxide film composition of the main part.

Parameter Comparison

Engineering Selection Recommendations

Both the RSMF3JB680R and SQP500JB-680R maintain Active product status and full ROHS3 compliance. Selection between these parts depends on application-specific constraints:

The RSMF3JB680R is the primary choice when the 3W power rating is sufficient and the compact axial dimensions (5.50mm diameter) are required for space-constrained PCB layouts. The metal oxide film composition and ±200ppm/°C temperature coefficient provide stable performance across the full -55°C to 235°C operating range.

The SQP500JB-680R serves as a substitute when higher power dissipation capacity (5W) is beneficial or when pulse withstanding capability is required. The larger physical dimensions (9.50mm x 9.00mm x 22.00mm) must be accommodated in the circuit layout. The operating temperature range is limited to -55°C to 155°C, which may restrict use in high-temperature applications.

Frequently Asked Questions (FAQ)

Q: Can the SQP500JB-680R directly replace the RSMF3JB680R in any application?

A: Direct replacement is possible only when the circuit layout accommodates the larger dimensions of the SQP500JB-680R (9.50mm x 9.00mm x 22.00mm versus 5.50mm diameter x 15.00mm length) and the maximum operating temperature does not exceed 155°C.

Q: What is the primary difference between these two 680 Ohm resistors?

A: The main differences are power rating (3W vs 5W), composition (metal oxide film vs cement), physical size, and maximum operating temperature (235°C vs 155°C). Both maintain identical resistance value and tolerance.

Q: Are both parts suitable for high-temperature applications above 155°C?

A: Only the RSMF3JB680R is rated for continuous operation up to 235°C. The SQP500JB-680R is limited to 155°C maximum.

Q: Do both resistors meet current compliance requirements?

A: Yes, both the RSMF3JB680R and SQP500JB-680R are ROHS3 Compliant and REACH Unaffected.

Q: What packaging formats are available?

A: The RSMF3JB680R is supplied in Bulk packaging, while the SQP500JB-680R is supplied in Tray packaging.