RC3225F31R6CS Equivalent & Substitute Parts Reference

Part Overview

The RC3225F31R6CS is a 31.6 Ohm ±1% thick film chip resistor manufactured by Samsung Electro-Mechanics in the 1210 (3225 Metric) package format. This component is rated for 0.333W (1/3W) power dissipation with moisture-resistant construction and operates across the temperature range of -55°C to 155°C. The part maintains Active product status and is ROHS3 compliant with MSL 1 rating.

Substitute parts become necessary when the primary part experiences supply constraints, inventory limitations, or when design requirements permit higher power ratings or enhanced automotive qualification levels without compromising circuit performance.

Substiute Parts

RC3225F31R6CS

Samsung Electro-MechanicsIn Stock: 811RC3225F31R6CS Datasheet

Current PartRFQ

CRCW121031R6FKEA

Vishay DaleIn Stock: 12096CRCW121031R6FKEA Datasheet

SimilarRFQ

ERJ-14NF31R6U

Panasonic Electronic ComponentsIn Stock: 2693ERJ-14NF31R6U Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the RC3225F31R6CS is based on the following criteria:

Mandatory Matching Parameters:

• Resistance value: 31.6 Ohms (exact match required)
• Tolerance: ±1% (no deviation permitted)
• Package format: 1210 (3225 Metric) (physical and electrical compatibility)
• Composition: Thick Film (electrical performance characteristics)
• Temperature coefficient: ±100ppm/°C (stability requirement)
• Operating temperature range: -55°C to 155°C (environmental specification)
• RoHS compliance: ROHS3 (regulatory requirement)

Allowable Variation Parameters:

• Power rating: Substitute parts may exceed 0.333W (0.5W acceptable as higher rating provides design margin)
• Moisture sensitivity: MSL 1 maintained across all substitutes
• Automotive qualification: AEC-Q200 certification is an enhancement, not a requirement for substitution

The identified substitute parts CRCW121031R6FKEA and ERJ-14NF31R6U meet all mandatory parameters while offering increased power dissipation capability (0.5W vs. 0.333W) and automotive-grade qualification.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: CRCW121031R6FKEA (Vishay Dale)

This part is the preferred substitute based on the following factors:

• Active product status ensures long-term availability and supply chain stability
• Identical electrical specifications to the main part (31.6 Ohms, ±1%, ±100ppm/°C, -55°C to 155°C)
• Higher power rating (0.5W vs. 0.333W) provides additional thermal margin without circuit modification
• AEC-Q200 automotive qualification adds robustness for demanding applications
• Physically compatible with identical package dimensions (3.20mm x 2.50mm)
• ROHS3 compliant with MSL 1 rating maintained

Secondary Substitute: ERJ-14NF31R6U (Panasonic Electronic Components)

This part is acceptable as a substitute with the following considerations:

• Meets all mandatory electrical parameters (31.6 Ohms, ±1%, ±100ppm/°C, -55°C to 155°C)
• Higher power rating (0.5W) provides thermal design margin
• AEC-Q200 automotive qualification available
• Product status is "Not For New Designs," indicating this part is in mature/declining phase; use only for legacy system maintenance or when CRCW121031R6FKEA is unavailable
• Slightly higher maximum height (0.70mm vs. 0.66mm) requires verification of PCB clearance in space-constrained layouts

Frequently Asked Questions (FAQ)

Q: Can the RC3225F31R6CS be replaced with a higher power-rated resistor?

A: Yes. Both substitute parts feature 0.5W (1/2W) power ratings compared to the original 0.333W (1/3W). Higher power ratings are acceptable substitutes provided all other parameters (resistance, tolerance, package, temperature coefficient, operating range) remain identical. This substitution provides additional thermal margin and does not degrade circuit performance.

Q: Are the physical dimensions compatible between the main part and substitutes?

A: The 1210 (3225 Metric) package format is standardized across all three parts. Length is identical at 3.20mm. Width varies slightly (2.55mm vs. 2.50mm), which is within standard package tolerance and does not affect PCB footprint compatibility. Height differences (0.66mm, 0.60mm, 0.70mm) are minimal and do not impact clearance in typical applications; verify clearance only in space-constrained designs.

Q: What is the significance of AEC-Q200 automotive qualification on the substitute parts?

A: AEC-Q200 is an automotive industry standard qualification that certifies component reliability under automotive operating conditions. The main part (RC3225F31R6CS) does not specify this qualification, while both substitutes carry AEC-Q200 certification. This is an enhancement that does not prevent substitution; it indicates the substitute parts have undergone additional qualification testing and are suitable for automotive applications.

Q: Why is the ERJ-14NF31R6U marked "Not For New Designs"?

A: This product status indicates the part is in the mature or declining phase of its lifecycle. Panasonic continues to support existing inventory and legacy applications, but recommends new designs use alternative parts. For new circuit designs, CRCW121031R6FKEA is the preferred substitute. ERJ-14NF31R6U remains electrically and mechanically compatible and may be used for maintenance, repair, or legacy system support.

Q: Can these resistors be used interchangeably in the same PCB assembly?

A: Yes, all three parts use identical 1210 (3225 Metric) package format with two terminations. PCB footprints are compatible. Substitution requires no circuit redesign or PCB layout modification. Verify component height clearance only in applications with restricted vertical space.

Q: What compliance certifications apply to all parts in this substitution group?

A: All three parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. REACH status is "REACH Unaffected" for all parts. ECCN classification is EAR99 for all parts. These regulatory and compliance parameters are consistent across the substitution group.