RMCS0805FT49K9 Equivalent & Substitute Parts

Part Overview

The RMCS0805FT49K9 is a 49.9 kOhms ±1% 0.125W thick film chip resistor in 0805 (2012 Metric) package manufactured by Stackpole Electronics Inc. This anti-sulfur resistor operates across -55°C to 155°C and is ROHS3 compliant with unlimited moisture sensitivity rating. The part is currently active in production with 746 units in stock. Equivalent and substitute parts are identified for applications requiring alternative sourcing, higher power ratings, automotive qualification, or enhanced environmental performance.

Substiute Parts

RMCS0805FT49K9

Stackpole Electronics IncIn Stock: 855RMCS0805FT49K9 Datasheet

Current PartRFQ

RMCF0805FT49K9

Stackpole Electronics IncIn Stock: 351937RMCF0805FT49K9 Datasheet

MFR RecommendedRFQ

AC0805FR-0749K9L

YAGEOIn Stock: 33337AC0805FR-0749K9L Datasheet

MFR RecommendedRFQ

CRCW080549K9FKEA

Vishay DaleIn Stock: 128911CRCW080549K9FKEA Datasheet

MFR RecommendedRFQ

CRCW080549K9FKEAHP

Vishay DaleIn Stock: 14966CRCW080549K9FKEAHP Datasheet

MFR RecommendedRFQ

CRCW080549K9FKTA

Vishay DaleIn Stock: 13979CRCW080549K9FKTA Datasheet

MFR RecommendedRFQ

ERJ-6ENF4992V

Panasonic Electronic ComponentsIn Stock: 129466ERJ-6ENF4992V Datasheet

MFR RecommendedRFQ

RC0805FR-0749K9L

YAGEOIn Stock: 2745373RC0805FR-0749K9L Datasheet

MFR RecommendedRFQ

RCS080549K9FKEA

Vishay DaleIn Stock: 10675RCS080549K9FKEA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RMCS0805FT49K9 are grouped based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

• Resistance value: 49.9 kOhms
• Tolerance: ±1%
• Package: 0805 (2012 Metric)
• Temperature coefficient: ±100ppm/°C
• Operating temperature range: -55°C ~ 155°C
• Composition: Thick film

Secondary Differentiation Factors:

• Power rating (0.125W standard, 0.5W enhanced)
• Automotive qualification (AEC-Q200)
• Environmental features (anti-sulfur, moisture resistant, pulse withstanding)
• RoHS compliance status
• Packaging format (Tape & Reel vs. Cut Tape)

All identified substitutes maintain the core electrical specifications while offering variations in automotive qualification, power handling, and environmental protection features.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Same Specifications): RMCF0805FT49K9 from Stackpole Electronics Inc provides identical electrical and mechanical specifications with the addition of automotive AEC-Q200 qualification. This part is recommended for applications requiring automotive-grade reliability while maintaining the same form factor and power rating.

Automotive-Qualified Alternatives: CRCW080549K9FKEA, CRCW080549K9FKTA, and ERJ-6ENF4992V are automotive AEC-Q200 qualified alternatives maintaining 0.125W power rating. CRCW080549K9FKEA and ERJ-6ENF4992V are ROHS3 compliant. CRCW080549K9FKTA is RoHS non-compliant and should be avoided for applications requiring RoHS compliance.

Enhanced Power Rating Options: CRCW080549K9FKEAHP and RCS080549K9FKEA provide 0.5W (1/2W) power rating with automotive AEC-Q200 qualification and pulse withstanding capability. These are suitable for applications requiring higher power dissipation or transient pulse tolerance.

Moisture-Resistant Variants: AC0805FR-0749K9L and RC0805FR-0749K9L offer moisture-resistant thick film construction. AC0805FR-0749K9L includes automotive AEC-Q200 qualification, while RC0805FR-0749K9L does not.

Packaging Considerations: ERJ-6ENF4992V and RC0805FR-0749K9L are supplied in Cut Tape & Digi-Reel format. All other substitutes are supplied in Tape & Reel format matching the original part.

Frequently Asked Questions (FAQ)

Q: Can RMCF0805FT49K9 be used as a direct replacement for RMCS0805FT49K9?

A: Yes. RMCF0805FT49K9 maintains identical resistance, tolerance, power rating, package, temperature coefficient, and operating temperature range. The primary difference is the addition of automotive AEC-Q200 qualification, making it suitable for automotive applications while remaining compatible with standard industrial designs.

Q: What is the difference between 0.125W and 0.5W power-rated parts?

A: Power rating determines maximum continuous power dissipation. The 0.125W (1/8W) rating of the original part limits continuous dissipation to 125 milliwatts. The 0.5W (1/2W) variants (CRCW080549K9FKEAHP, RCS080549K9FKEA) allow up to 500 milliwatts continuous dissipation and include pulse withstanding capability for transient overvoltage events. Selection depends on circuit power requirements.

Q: Are all substitutes ROHS3 compliant?

A: No. CRCW080549K9FKTA is RoHS non-compliant. All other listed substitutes are ROHS3 compliant. Verify compliance requirements for your application before selection.

Q: What does AEC-Q200 qualification mean?

A: AEC-Q200 is an automotive electronics council qualification standard for passive components. It certifies the part meets automotive reliability, temperature cycling, and environmental stress requirements. Parts with AEC-Q200 qualification are suitable for automotive applications but remain fully compatible with industrial and consumer applications.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel and Cut Tape & Digi-Reel packaging formats do not affect electrical specifications. Selection depends on assembly equipment compatibility and procurement preferences. Both formats maintain identical component performance.

Q: Can moisture-resistant variants be used in standard applications?

A: Yes. AC0805FR-0749K9L and RC0805FR-0749K9L provide enhanced moisture resistance without compromising standard application compatibility. These variants are suitable for both moisture-sensitive and standard environments.

Q: What is the significance of anti-sulfur and pulse withstanding features?

A: Anti-sulfur protection (RMCS0805FT49K9) prevents sulfur corrosion in high-sulfur environments. Pulse withstanding capability (CRCW080549K9FKEAHP, RCS080549K9FKEA) allows the resistor to tolerate transient voltage spikes beyond normal operating conditions. Select based on environmental and circuit requirements.