RC1005F4991CS Equivalent & Substitute Parts

Part Overview

The RC1005F4991CS is a 4.99 kOhms ±1% thick film chip resistor manufactured by Samsung Electro-Mechanics in 0402 (1005 Metric) package format. This surface mount device (SMD) is rated at 0.063W (1/16W) power dissipation with a temperature coefficient of ±100ppm/°C and operates across -55°C to 155°C. The component features moisture resistance and is ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. The RC1005F4991CS maintains Active product status with 918 pieces currently in stock. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical dimensions, and package compatibility to support design flexibility and supply chain continuity.

Substiute Parts

RC1005F4991CS

Samsung Electro-MechanicsIn Stock: 977RC1005F4991CS Datasheet

Current PartRFQ

CR0402-FX-4991GLF

Bourns Inc.In Stock: 75201CR0402-FX-4991GLF Datasheet

DirectRFQ

RCG04024K99FKED

Vishay DaleIn Stock: 37416RCG04024K99FKED Datasheet

DirectRFQ

ERJ-2RKF4991X

Panasonic Electronic ComponentsIn Stock: 2315009ERJ-2RKF4991X Datasheet

UpgradeRFQ

AC0402FR-074K99L

YAGEOIn Stock: 1527AC0402FR-074K99L Datasheet

SimilarRFQ

AF0402FR-074K99L

YAGEOIn Stock: 10828AF0402FR-074K99L Datasheet

SimilarRFQ

CRCW04024K99FKED

Vishay DaleIn Stock: 179418CRCW04024K99FKED Datasheet

SimilarRFQ

CRCW04024K99FKTD

Vishay DaleIn Stock: 85942CRCW04024K99FKTD Datasheet

SimilarRFQ

RCA04024K99FKED

Vishay DaleIn Stock: 33047RCA04024K99FKED Datasheet

SimilarRFQ

RMCF0402FT4K99

Stackpole Electronics IncIn Stock: 46279RMCF0402FT4K99 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RC1005F4991CS are classified based on strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Resistance Value: 4.99 kOhms (exact match required)
• Tolerance: ±1% (exact match required)
• Package / Case: 0402 (1005 Metric) (exact match required)
• Composition: Thick Film (exact match required)
• Temperature Coefficient: ±100ppm/°C (exact match required)
• Operating Temperature Range: -55°C to 155°C (exact match required)
• Size / Dimension: 0.039" L x 0.020" W (1.00mm x 0.50mm) (exact match required)
• Number of Terminations: 2 (exact match required)

Secondary Considerations:

• Power Rating: 0.063W (1/16W) baseline; higher ratings (0.1W / 1/10W) are acceptable upgrades
• RoHS Compliance: ROHS3 Compliant preferred; non-compliant parts noted separately
• Moisture Sensitivity: MSL 1 (Unlimited) standard across all substitutes
• Packaging Format: Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® formats are interchangeable for component selection

Substitution Categories:

Direct Substitutes maintain identical electrical and mechanical specifications with equivalent performance characteristics:

• CR0402-FX-4991GLF (Bourns Inc.)
• RCG04024K99FKED (Vishay Dale)

Upgrade Substitute provides enhanced power rating while maintaining all other specifications:

• ERJ-2RKF4991X (Panasonic Electronic Components) – 0.1W (1/10W) rating with Automotive AEC-Q200 certification

Similar Substitutes match core specifications with additional features or certifications:

• AC0402FR-074K99L (YAGEO) – Automotive AEC-Q200, Moisture Resistant
• AF0402FR-074K99L (YAGEO) – Anti-Sulfur, Automotive AEC-Q200
• CRCW04024K99FKED (Vishay Dale) – Automotive AEC-Q200, Cut Tape packaging
• CRCW04024K99FKTD (Vishay Dale) – Automotive AEC-Q200, Tape & Reel packaging
• RCA04024K99FKED (Vishay Dale) – Anti-Sulfur, Automotive AEC-Q200
• RMCF0402FT4K99 (Stackpole Electronics Inc) – Automotive AEC-Q200

Parameter Comparison

Engineering Selection Recommendations

For Standard Industrial Applications: CR0402-FX-4991GLF (Bourns Inc.) and RCG04024K99FKED (Vishay Dale) provide direct electrical and mechanical equivalence to the RC1005F4991CS. Both maintain ROHS3 compliance and identical performance characteristics across the specified operating temperature range. These options are suitable for applications where the original moisture-resistant feature is not a critical requirement.

For Automotive and Enhanced Reliability Applications: ERJ-2RKF4991X (Panasonic Electronic Components) offers an upgrade path with increased power rating (0.1W vs. 0.063W) and Automotive AEC-Q200 certification. This component is appropriate for automotive-grade designs requiring enhanced thermal performance and qualification standards.

For Moisture-Sensitive or Harsh Environment Applications: AC0402FR-074K99L (YAGEO) combines Automotive AEC-Q200 certification with moisture resistance, matching the environmental protection features of the original RC1005F4991CS. AF0402FR-074K99L (YAGEO) adds anti-sulfur protection for corrosive environments.

For Anti-Sulfur Protection Requirements: RCA04024K99FKED (Vishay Dale) and AF0402FR-074K99L (YAGEO) provide anti-sulfur thick film composition suitable for applications exposed to sulfur-containing atmospheres or corrosive conditions.

Compliance Considerations: All recommended substitutes maintain ROHS3 compliance except CRCW04024K99FKTD (Vishay Dale), which is RoHS non-compliant and REACH Affected. CRCW04024K99FKTD should be selected only when legacy design requirements or specific supply chain constraints mandate its use.

Packaging Format Selection: Tape & Reel (TR) packaging is standard for high-volume automated assembly. Cut Tape (CT) & Digi-Reel® formats are available for lower-volume or mixed-component applications. Packaging format does not affect electrical or mechanical performance.

Frequently Asked Questions (FAQ)

Q: Can CR0402-FX-4991GLF be used as a direct replacement for RC1005F4991CS?

A: Yes. CR0402-FX-4991GLF matches all critical electrical parameters (4.99 kΩ ±1%, 0.063W, ±100ppm/°C) and mechanical specifications (0402 package, 1.00mm x 0.50mm, 0.40mm height). Both are ROHS3 compliant with MSL 1 rating. The primary difference is the absence of explicit moisture-resistant designation on the Bourns part, though both maintain MSL 1 (Unlimited) moisture sensitivity level.

Q: What is the difference between the direct substitutes and the upgrade substitute?

A: Direct substitutes (CR0402-FX-4991GLF, RCG04024K99FKED) maintain identical 0.063W power rating. The upgrade substitute ERJ-2RKF4991X increases power rating to 0.1W (1/10W) while preserving all other specifications. The higher power rating allows greater thermal headroom in applications with higher current or power dissipation requirements. Upgrade substitutes are backward compatible with designs specified for lower power ratings.

Q: Are automotive-qualified parts (AEC-Q200) compatible with non-automotive applications?

A: Yes. Automotive AEC-Q200 qualified parts exceed standard industrial reliability requirements and are fully compatible with non-automotive designs. AEC-Q200 certification indicates enhanced qualification testing, extended temperature cycling, and stricter failure rate monitoring. Using automotive-qualified components in industrial applications provides additional design margin and reliability assurance.

Q: What does anti-sulfur protection mean, and when is it required?

A: Anti-sulfur thick film composition resists degradation from hydrogen sulfide (H₂S) and other sulfur-containing compounds in the environment. This protection is required in applications exposed to industrial atmospheres, coastal environments, or manufacturing facilities with sulfur emissions. Standard thick film resistors without anti-sulfur protection may experience resistance drift or failure in these conditions. AF0402FR-074K99L and RCA04024K99FKED provide this protection.

Q: Can I substitute a 0.1W rated resistor (ERJ-2RKF4991X) in a circuit designed for 0.063W (1/16W)?

A: Yes. A higher power-rated component is a safe upgrade. The 0.1W rating indicates the resistor can dissipate more power without exceeding temperature limits. If the circuit design specifies 0.063W, the actual power dissipation will remain below this threshold, and the 0.1W component will operate well within its safe operating range. This substitution improves thermal performance and reliability margins.

Q: What is the significance of MSL 1 (Unlimited) moisture sensitivity level?

A: MSL 1 (Unlimited) indicates the component has no moisture sensitivity restrictions. The part does not require special moisture-controlled storage, handling, or baking procedures before soldering. This classification applies to all listed substitutes and the original RC1005F4991CS, making them suitable for standard warehouse storage and manufacturing environments without specialized moisture control measures.

Q: Why is CRCW04024K99FKTD listed as RoHS non-compliant?

A: CRCW04024K99FKTD is marked as RoHS non-compliant and REACH Affected, indicating it may contain restricted substances or does not meet current environmental regulations. This part should be selected only when legacy design requirements, specific supply chain constraints, or regulatory exemptions mandate its use. For new designs, ROHS3 compliant alternatives are recommended.

Q: Does packaging format (Tape & Reel vs. Cut Tape) affect component performance?

A: No. Packaging format affects only handling, storage, and assembly logistics. Tape & Reel (TR) is optimized for high-volume automated pick-and-place assembly. Cut Tape (CT) & Digi-Reel® formats are suitable for lower-volume or mixed-component applications. The electrical and mechanical performance of the resistor is identical regardless of packaging format.

Q: Are there any dimensional differences between substitute parts that could affect PCB layout?

A: Dimensional differences are minimal. The RC1005F4991CS specifies maximum seated height of 0.016" (0.40mm). YAGEO parts (AC0402FR-074K99L, AF0402FR-074K99L) have slightly lower maximum height of 0.015" (0.37mm). All other dimensions (length, width) are identical at 0.039" L x 0.020" W (1.00mm x 0.50mm). These minor height variations do not affect standard PCB layout or assembly processes.

Q: Which substitute offers the best overall compatibility for general-purpose applications?

A: CR0402-FX-4991GLF (Bourns Inc.) and RCG04024K99FKED (Vishay Dale) provide the closest direct equivalence to RC1005F4991CS with identical electrical specifications, ROHS3 compliance, and standard packaging options. For applications requiring enhanced reliability or automotive qualification, CRCW04024K99FKED (Vishay Dale) or RMCF0402FT4K99 (Stackpole Electronics Inc) are recommended as they add AEC-Q200 certification while maintaining all core specifications.