RC3225J3R9CS Equivalent & Substitute Parts Reference

Part Overview

The RC3225J3R9CS is a 3.9 Ohm ±5% thick film chip resistor manufactured by Samsung Electro-Mechanics, rated at 1/3W (0.333W) power dissipation in a 1210 (3225 Metric) surface mount package. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). The part is specified for general-purpose applications requiring moisture-resistant thick film construction across an operating temperature range of -55°C to 155°C. Equivalent and substitute parts are identified to support component availability, design optimization, and supply chain flexibility while maintaining electrical and mechanical compatibility.

Substiute Parts

RC3225J3R9CS

Samsung Electro-MechanicsIn Stock: 810RC3225J3R9CS Datasheet

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KTR25JZPF3R90

Rohm SemiconductorIn Stock: 8060KTR25JZPF3R90 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RC3225J3R9CS is determined by strict alignment with the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 3.9 Ohms (exact match required)
• Package / Case: 1210 (3225 Metric) for PCB footprint compatibility
• Power rating: minimum 0.333W (1/3W)
• Composition: Thick Film
• Operating temperature range: must encompass -55°C to 155°C
• RoHS3 compliance status

Allowable Variations:

• Tolerance: ±1% is acceptable as a tighter specification than ±5%
• Temperature coefficient: lower values (±100ppm/°C vs. ±300ppm/°C) represent improved stability
• Additional certifications (AEC-Q200): acceptable enhancements for automotive applications
• Packaging format: Tape & Reel (TR) is compatible with standard pick-and-place assembly

The KTR25JZPF3R90 from Rohm Semiconductor qualifies as a direct substitute based on these criteria.

Parameter Comparison

Engineering Selection Recommendations

RC3225J3R9CS (Samsung Electro-Mechanics) is the primary specification for applications requiring standard thick film resistor performance with moisture resistance across the full -55°C to 155°C operating range. This part maintains Active product status with established supply availability (711 Pcs in stock) and full RoHS3 compliance.

KTR25JZPF3R90 (Rohm Semiconductor) is a qualified substitute offering enhanced electrical performance through tighter tolerance (±1% vs. ±5%) and improved temperature stability (±100ppm/°C vs. ±300ppm/°C). This part includes AEC-Q200 automotive qualification, making it suitable for applications requiring automotive-grade reliability. The substitute maintains identical power rating, package footprint, and operating temperature range. Significantly higher inventory availability (7975 Pcs) supports supply chain continuity. Tape & Reel packaging is standard for automated assembly processes.

Selection between these parts should be based on application requirements: the Samsung part for cost-optimized general-purpose designs, and the Rohm part for applications demanding tighter tolerance control, improved temperature stability, or automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can KTR25JZPF3R90 be used as a direct replacement for RC3225J3R9CS on existing PCBs?

A: Yes. Both parts share identical 1210 (3225 Metric) package dimensions (3.20mm length, 0.65mm maximum seated height), identical power rating (0.333W), and identical operating temperature range (-55°C to 155°C). PCB footprints are compatible. The 0.05mm width difference (2.55mm vs. 2.50mm) is within standard PCB design tolerances.

Q: What is the impact of the tolerance difference (±5% vs. ±1%)?

A: The RC3225J3R9CS tolerance of ±5% allows resistance values between 3.705 Ohms and 4.095 Ohms. The KTR25JZPF3R90 tolerance of ±1% restricts values to 3.861 Ohms to 3.939 Ohms. For applications sensitive to resistance variation, the Rohm substitute provides superior precision. For general-purpose applications, both tolerances are functionally equivalent.

Q: Are there differences in moisture handling or storage requirements?

A: Both parts carry MSL 1 (Unlimited) moisture sensitivity rating, indicating no special moisture control requirements during storage or handling. Standard component storage conditions apply to both parts.

Q: Does the AEC-Q200 certification on the Rohm part affect compatibility?

A: No. AEC-Q200 is an automotive qualification standard that represents enhanced reliability testing and quality assurance. It is a superset of standard requirements and does not create incompatibility. Parts with AEC-Q200 certification are suitable for both automotive and general-purpose applications.

Q: What is the significance of the temperature coefficient difference?

A: Temperature coefficient (±300ppm/°C vs. ±100ppm/°C) describes resistance change per degree Celsius. The Rohm part exhibits superior temperature stability, meaning its resistance value remains closer to nominal across the -55°C to 155°C operating range. For precision analog circuits or temperature-sensitive applications, this represents improved performance.

Q: Are both parts RoHS3 compliant?

A: Yes. Both RC3225J3R9CS and KTR25JZPF3R90 carry ROHS3 Compliant status, meeting lead-free and restricted substance requirements for EU and global markets.