RMCS0805FT4K99 Equivalent & Substitute Parts

Part Overview

The RMCS0805FT4K99 is a 4.99 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 937 units in stock. Substitute parts are necessary to address supply availability, specific application requirements such as automotive qualification, or enhanced performance features like pulse withstanding capability.

Substiute Parts

RMCS0805FT4K99

Stackpole Electronics IncIn Stock: 996RMCS0805FT4K99 Datasheet

Current PartRFQ

RMCF0805FT4K99

Stackpole Electronics IncIn Stock: 61187RMCF0805FT4K99 Datasheet

MFR RecommendedRFQ

AF0805FR-074K99L

YAGEOIn Stock: 4237AF0805FR-074K99L Datasheet

UpgradeRFQ

AC0805FR-074K99L

YAGEOIn Stock: 66342AC0805FR-074K99L Datasheet

MFR RecommendedRFQ

CRCW08054K99FKEA

Vishay DaleIn Stock: 266040CRCW08054K99FKEA Datasheet

MFR RecommendedRFQ

CRCW08054K99FKEAHP

Vishay DaleIn Stock: 120344CRCW08054K99FKEAHP Datasheet

MFR RecommendedRFQ

CRCW08054K99FKTA

Vishay DaleIn Stock: 66408CRCW08054K99FKTA Datasheet

MFR RecommendedRFQ

ERJ-6ENF4991V

Panasonic Electronic ComponentsIn Stock: 79722ERJ-6ENF4991V Datasheet

MFR RecommendedRFQ

RC0805FR-074K99L

YAGEOIn Stock: 9274RC0805FR-074K99L Datasheet

MFR RecommendedRFQ

RCS08054K99FKEA

Vishay DaleIn Stock: 11157RCS08054K99FKEA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following mandatory parameters:

• Resistance value: 4.99 kOhms
• Tolerance: ±1%
• Package / Case: 0805 (2012 Metric)
• Composition: Thick Film
• Temperature Coefficient: ±100ppm/°C
• Operating Temperature Range: -55°C ~ 155°C

All listed substitute parts meet these core electrical and mechanical specifications. Substitutes are grouped by power rating and additional features:

Group 1 (0.125W / 1/8W): RMCF0805FT4K99, AF0805FR-074K99L, AC0805FR-074K99L, CRCW08054K99FKEA, CRCW08054K99FKTA, ERJ-6ENF4991V, RC0805FR-074K99L

Group 2 (0.5W / 1/2W): CRCW08054K99FKEAHP, RCS08054K99FKEA

Power rating upgrades from 0.125W to 0.5W are acceptable substitutions when circuit design permits higher power dissipation capability.

Parameter Comparison

Engineering Selection Recommendations

For standard applications without automotive requirements: RMCF0805FT4K99 (Stackpole) or CRCW08054K99FKEA (Vishay Dale) provide direct electrical equivalence with ROHS3 compliance and high inventory availability.

For automotive applications (AEC-Q200 qualified): AF0805FR-074K99L, AC0805FR-074K99L, CRCW08054K99FKEA, ERJ-6ENF4991V, or RCS08054K99FKEA are suitable. AC0805FR-074K99L and AF0805FR-074K99L combine anti-sulfur or moisture-resistant features with automotive qualification.

For applications requiring enhanced pulse withstanding capability: CRCW08054K99FKEAHP or RCS08054K99FKEA offer 0.5W power rating with pulse withstanding features while maintaining AEC-Q200 qualification.

For space-constrained designs: CRCW08054K99FKEA and CRCW08054K99FKEAHP feature the lowest seated height (0.50mm) among available substitutes.

Compliance consideration: CRCW08054K99FKTA is RoHS non-compliant and REACH affected; use only when legacy design requirements mandate this specification.

Frequently Asked Questions (FAQ)

Q: Can RMCS0805FT4K99 be directly replaced with any of the listed substitutes?

A: Yes, all listed substitutes maintain the core electrical specifications: 4.99 kOhms ±1%, 0805 package, thick film composition, and -55°C to 155°C operating range. Physical height variations (0.50mm to 0.70mm) are within typical PCB design tolerances for 0805 components.

Q: What is the difference between 0.125W and 0.5W rated substitutes?

A: The 0.125W parts (CRCW08054K99FKEAHP, RCS08054K99FKEA) provide four times the power dissipation capability. These are suitable substitutes when circuit design permits higher power handling. Standard 0.125W applications do not require the 0.5W upgrade.

Q: Are automotive-qualified parts (AEC-Q200) interchangeable with non-automotive versions?

A: Yes. AEC-Q200 qualified parts exceed the electrical and reliability requirements of standard industrial-grade resistors and are fully compatible in non-automotive applications. Automotive-qualified substitutes provide additional qualification margin.

Q: What packaging formats are available?

A: Tape & Reel (TR) is the standard format for high-volume applications. Cut Tape (CT) & Digi-Reel® options are available for CRCW08054K99FKTA, ERJ-6ENF4991V, and RC0805FR-074K99L, suitable for lower-volume or mixed-component orders.

Q: Does the anti-sulfur feature affect substitution compatibility?

A: Anti-sulfur and moisture-resistant features are enhancements that do not affect electrical compatibility. Parts with these features (RMCS0805FT4K99, AF0805FR-074K99L, AC0805FR-074K99L, RC0805FR-074K99L) are suitable for environments with corrosive atmospheres or high humidity but are interchangeable in standard applications.

Q: Which substitute offers the best inventory availability?

A: CRCW08054K99FKEA (Vishay Dale) has the highest inventory at 265,993 units, followed by CRCW08054K99FKEAHP at 120,249 units and RMCF0805FT4K99 at 61,132 units.