RMCS1206FT51R1 Equivalent & Substitute Parts

Part Overview

The RMCS1206FT51R1 is a 51.1 Ohm ±1% 0.25W thick film chip resistor in 1206 (3216 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. Substitute parts are necessary to address supply availability, specific application requirements such as automotive qualification, or enhanced performance characteristics while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Resistance	51.1 Ohms
Tolerance	±1%
Power Rating	0.25W (1/4W)
Package / Case	1206 (3216 Metric)
Composition	Thick Film
Temperature Coefficient	±100ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Number of Terminations	2
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the RMCS1206FT51R1 is determined by the following critical parameters:

Resistance value: 51.1 Ohms
Tolerance: ±1%
Power rating: 0.25W (1/4W)
Package: 1206 (3216 Metric)
Composition: Thick Film
Temperature coefficient: ±100ppm/°C
Operating temperature range: -55°C ~ 155°C
Termination count: 2

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in physical dimensions (length, width, height), packaging format (Tape & Reel vs. Cut Tape), and additional features (automotive AEC-Q200 qualification, pulse withstanding capability, moisture resistance) do not affect functional substitutability within the specified parameter constraints.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (Watts)	Package	Composition	Temp Coeff	Operating Temp	RoHS Status	Product Status
RMCS1206FT51R1	Stackpole Electronics Inc	51.1 Ohms	±1%	0.25W	1206	Thick Film	±100ppm/°C	-55°C ~ 155°C	ROHS3 Compliant	Active
RMCF1206FT51R1	Stackpole Electronics Inc	51.1 Ohms	±1%	0.25W	1206	Thick Film	±100ppm/°C	-55°C ~ 155°C	ROHS3 Compliant	Active
CR1206-FX-51R1ELF	Bourns Inc.	51.1 Ohms	±1%	0.25W	1206	Thick Film	±100ppm/°C	-55°C ~ 155°C	ROHS3 Compliant	Active
CRCW120651R1FKEA	Vishay Dale	51.1 Ohms	±1%	0.25W	1206	Thick Film	±100ppm/°C	-55°C ~ 155°C	ROHS3 Compliant	Active
CRCW120651R1FKEAHP	Vishay Dale	51.1 Ohms	±1%	0.75W	1206	Thick Film	±100ppm/°C	-55°C ~ 155°C	ROHS3 Compliant	Active
CRCW120651R1FKTA	Vishay Dale	51.1 Ohms	±1%	0.25W	1206	Thick Film	±100ppm/°C	-55°C ~ 155°C	RoHS non-compliant	Active
ERJ-8ENF51R1V	Panasonic Electronic Components	51.1 Ohms	±1%	0.25W	1206	Thick Film	±100ppm/°C	-55°C ~ 155°C	ROHS3 Compliant	Not For New Designs
RC1206FR-0751R1L	YAGEO	51.1 Ohms	±1%	0.25W	1206	Thick Film	±100ppm/°C	-55°C ~ 155°C	ROHS3 Compliant	Active

Engineering Selection Recommendations

Primary Substitutes (Active Status, ROHS3 Compliant):

RMCF1206FT51R1, CR1206-FX-51R1ELF, CRCW120651R1FKEA, and RC1206FR-0751R1L are direct functional equivalents with active product status and full ROHS3 compliance. These parts are suitable for new designs and production applications requiring standard 0.25W operation.

Automotive-Qualified Alternatives:

RMCF1206FT51R1, CRCW120651R1FKEA, CRCW120651R1FKEAHP, and ERJ-8ENF51R1V carry AEC-Q200 automotive qualification. CRCW120651R1FKEAHP provides enhanced 0.75W power rating with pulse withstanding capability for demanding automotive applications, though this exceeds the original 0.25W specification.

Compliance Considerations:

CRCW120651R1FKTA is RoHS non-compliant and REACH affected; use only in applications where legacy compliance status is acceptable. ERJ-8ENF51R1V is marked "Not For New Designs" and should be used only for legacy system maintenance or replacement scenarios.

Packaging Format:

CRCW120651R1FKEA is supplied in Cut Tape & Digi-Reel format; all other substitutes use Tape & Reel packaging. Verify packaging compatibility with assembly equipment before selection.

Frequently Asked Questions (FAQ)

Q: Can CRCW120651R1FKEAHP (0.75W) replace RMCS1206FT51R1 (0.25W)?

A: Electrically, yes. The 0.75W part maintains all core parameters (51.1 Ohms, ±1%, 1206 package, -55°C to 155°C). However, the higher power rating introduces different thermal characteristics and physical dimensions. Use only if circuit design accommodates the enhanced power capability and dimensional variations.

Q: What is the difference between anti-sulfur and moisture-resistant features?

A: Anti-sulfur protection (RMCS1206FT51R1) addresses corrosion from sulfur-containing environments. Moisture-resistant formulations (CR1206-FX-51R1ELF, RC1206FR-0751R1L) provide protection against humidity ingress. Both are compatible substitutes; selection depends on environmental exposure conditions.

Q: Is ERJ-8ENF51R1V suitable for new product designs?

A: No. ERJ-8ENF51R1V carries "Not For New Designs" status. Use only for replacement or legacy system support. For new designs, select from RMCF1206FT51R1, CR1206-FX-51R1ELF, CRCW120651R1FKEA, or RC1206FR-0751R1L.

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

A: No. Packaging format affects only handling, storage, and assembly logistics. CRCW120651R1FKEA (Cut Tape & Digi-Reel) is electrically identical to Tape & Reel variants. Verify compatibility with your assembly equipment before ordering.

Q: Are all substitutes ROHS3 compliant?

A: No. CRCW120651R1FKTA is RoHS non-compliant. All other listed substitutes are ROHS3 compliant. Verify compliance requirements for your application before selection.

Q: What is the significance of AEC-Q200 qualification?

A: AEC-Q200 indicates automotive-grade qualification meeting reliability and performance standards for automotive applications. Parts with this rating (RMCF1206FT51R1, CRCW120651R1FKEA, CRCW120651R1FKEAHP, ERJ-8ENF51R1V) are suitable for automotive designs; non-qualified parts are not.

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