RC1005F1271CS Equivalent & Substitute Parts Reference

Part Overview

The RC1005F1271CS is a 1.27 kOhms ±1% thick film chip resistor manufactured by Samsung Electro-Mechanics in 0402 (1005 Metric) package format. This surface mount device is rated at 0.063W (1/16W) power dissipation with moisture resistant characteristics and operates across the temperature range of -55°C to 155°C. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are identified to support component procurement flexibility, supply chain continuity, and application-specific requirements such as automotive qualification or enhanced power ratings.

Key Parameters

Parameter	Value
Resistance	1.27 kOhms
Tolerance	±1%
Power Rating	0.063W (1/16W)
Package / Case	0402 (1005 Metric)
Composition	Thick Film
Temperature Coefficient	±100ppm/°C
Operating Temperature Range	-55°C to 155°C
Terminations	2
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Packaging	Tape & Reel (TR)

Substitute Part Grouping Explanation

Substitute parts for the RC1005F1271CS are classified based on electrical and mechanical parameter alignment within the 0402 thick film resistor category. All identified substitutes maintain the core electrical specifications: 1.27 kOhms resistance value, ±1% tolerance, ±100ppm/°C temperature coefficient, and -55°C to 155°C operating temperature range. Package dimensions, termination count, and physical form factor remain constant across all substitutes.

Substitution grouping is determined by the following criteria:

Direct Equivalents maintain identical power ratings (0.063W / 1/16W), composition (thick film), and moisture resistance characteristics where specified.

Upgrade Substitutes feature enhanced power ratings (0.1W / 1/10W) while maintaining all other electrical parameters, providing increased thermal headroom in the same package footprint.

Automotive-Qualified Substitutes include AEC-Q200 certification in addition to standard electrical specifications, suitable for applications requiring automotive-grade component qualification.

All substitutes are ROHS3 compliant, MSL 1 rated, and available in Tape & Reel packaging format.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Op Temp Range (°C)	Features	AEC-Q200	Height Max (mm)
RC1005F1271CS	Samsung Electro-Mechanics	1.27 kΩ	±1%	0.063	±100	-55 to 155	Moisture Resistant	No	0.40
CR0402-FX-1271GLF	Bourns Inc.	1.27 kΩ	±1%	0.063	±100	-55 to 155	Standard	No	0.40
RC0402FR-071K27L	YAGEO	1.27 kΩ	±1%	0.063	±100	-55 to 155	Moisture Resistant	No	0.40
ERJ-2RKF1271X	Panasonic Electronic Components	1.27 kΩ	±1%	0.1	±100	-55 to 155	Automotive AEC-Q200	Yes	0.40
AC0402FR-071K27L	YAGEO	1.27 kΩ	±1%	0.063	±100	-55 to 155	Automotive AEC-Q200, Moisture Resistant	Yes	0.37
CRCW04021K27FKED	Vishay Dale	1.27 kΩ	±1%	0.063	±100	-55 to 155	Automotive AEC-Q200	Yes	0.40
RMCF0402FT1K27	Stackpole Electronics Inc	1.27 kΩ	±1%	0.063	±100	-55 to 155	Automotive AEC-Q200	Yes	0.40

Engineering Selection Recommendations

For Direct Replacement in Standard Applications: CR0402-FX-1271GLF (Bourns Inc.) and RC0402FR-071K27L (YAGEO) provide direct electrical and mechanical equivalence to the RC1005F1271CS. Both maintain 0.063W power rating, ±1% tolerance, and identical operating temperature specifications. RC0402FR-071K27L includes moisture resistant characteristics matching the original part. Both are ROHS3 compliant and MSL 1 rated.

For Automotive Applications: AC0402FR-071K27L (YAGEO), CRCW04021K27FKED (Vishay Dale), and RMCF0402FT1K27 (Stackpole Electronics Inc) are qualified to AEC-Q200 automotive standards. AC0402FR-071K27L combines automotive qualification with moisture resistant features and maintains 0.063W power rating. CRCW04021K27FKED and RMCF0402FT1K27 provide automotive-grade reliability with standard 0.063W ratings.

For Enhanced Thermal Performance: ERJ-2RKF1271X (Panasonic Electronic Components) offers upgraded 0.1W (1/10W) power rating within the same 0402 package footprint, providing increased thermal margin. This part includes AEC-Q200 automotive qualification and maintains all other electrical parameters identical to the main part.

Compliance Verification: All identified substitutes maintain ROHS3 compliance, MSL 1 moisture sensitivity rating, and EAR99 export classification consistent with the RC1005F1271CS.

Frequently Asked Questions (FAQ)

Q: Can CR0402-FX-1271GLF replace RC1005F1271CS in all applications? A: CR0402-FX-1271GLF provides electrical and mechanical equivalence with identical resistance, tolerance, power rating, and operating temperature range. The primary difference is the absence of specified moisture resistant features in the Bourns part. For applications where moisture resistance is not a design requirement, this part is a direct substitute.

Q: What is the difference between the 0.063W and 0.1W power-rated versions? A: ERJ-2RKF1271X is rated at 0.1W (1/10W) compared to the 0.063W (1/16W) rating of the main part. Both operate within the same temperature range and maintain identical resistance and tolerance specifications. The higher power rating provides increased thermal dissipation capability in the same physical package. Selection depends on circuit power dissipation requirements.

Q: Are all substitute parts suitable for automotive applications? A: AC0402FR-071K27L, CRCW04021K27FKED, RMCF0402FT1K27, and ERJ-2RKF1271X carry AEC-Q200 automotive qualification. CR0402-FX-1271GLF and RC0402FR-071K27L do not include automotive certification. Automotive application requirements determine whether AEC-Q200 qualification is mandatory.

Q: Does package height variation affect PCB assembly compatibility? A: AC0402FR-071K27L has a maximum seated height of 0.37mm, while all other parts are specified at 0.40mm maximum height. This 0.03mm difference is within standard PCB assembly tolerances for 0402 components and does not affect reflow soldering or placement compatibility.

Q: What is the significance of moisture resistant designation? A: RC1005F1271CS and RC0402FR-071K27L include moisture resistant thick film composition. AC0402FR-071K27L also specifies moisture resistant features. CR0402-FX-1271GLF, ERJ-2RKF1271X, CRCW04021K27FKED, and RMCF0402FT1K27 do not specify moisture resistance. Selection depends on environmental exposure and humidity conditions in the application.

Q: Are all parts available in Tape & Reel packaging? A: All identified substitute parts are supplied in Tape & Reel (TR) packaging format, consistent with the RC1005F1271CS packaging specification.

Q: What is MSL 1 rating and why is it important? A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life with no moisture bake requirement prior to soldering. All identified parts maintain MSL 1 rating, ensuring consistent handling and storage procedures across all substitutes.

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