RMCS1206FT1K00 Equivalent & Substitute Parts

Part Overview

The RMCS1206FT1K00 is a 1 kOhms ±1% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Stackpole Electronics Inc. This anti-sulfur component operates across -55°C to 155°C and is ROHS3 compliant with unlimited moisture sensitivity rating. The part is currently active in production with 706 units in stock.

Substitute parts are necessary when the RMCS1206FT1K00 becomes unavailable, when design requirements demand enhanced features such as automotive qualification or higher power ratings, or when supply chain optimization requires alternative sourcing from qualified manufacturers.

Key Parameters

Parameter	Value
Resistance	1 kOhms
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 is determined by strict equivalence across the following parameters: resistance value (1 kOhms), tolerance (±1%), package type (1206), composition (thick film), temperature coefficient (±100ppm/°C), operating temperature range (-55°C ~ 155°C), and termination count (2). All listed substitute parts meet these core electrical and mechanical requirements.

Substitute parts are grouped into three categories based on additional features and certifications:

Category 1: Direct Equivalent with Enhanced Features — Parts matching all core parameters with added automotive AEC-Q200 qualification or anti-sulfur protection.

Category 2: Higher Power Rating Variants — Parts with identical electrical specifications but increased power dissipation capability (0.5W or 0.75W).

Category 3: Legacy or Restricted Status — Parts meeting all specifications but with product status limitations or compliance restrictions.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Temp Range	Features	AEC-Q200	RoHS Status	Product Status
RMCS1206FT1K00	Stackpole	1 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Anti-Sulfur	No	ROHS3	Active
RMCF1206FT1K00	Stackpole	1 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Automotive AEC-Q200	Yes	ROHS3	Active
AF1206FR-071KL	YAGEO	1 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Anti-Sulfur, Automotive AEC-Q200	Yes	ROHS3	Active
AC1206FR-071KL	YAGEO	1 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Automotive AEC-Q200, Moisture Resistant	Yes	ROHS3	Active
CR1206-FX-1001ELF	Bourns Inc.	1 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Moisture Resistant	No	ROHS3	Active
CRCW12061K00FKEA	Vishay Dale	1 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Automotive AEC-Q200	Yes	ROHS3	Active
CRCW12061K00FKEAHP	Vishay Dale	1 kΩ	±1%	0.75	1206	±100ppm/°C	-55~155°C	Automotive AEC-Q200, Pulse Withstanding	Yes	ROHS3	Active
CRCW12061K00FKTA	Vishay Dale	1 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Automotive AEC-Q200	Yes	RoHS Non-compliant	Active
ERJ-8ENF1001V	Panasonic	1 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Automotive AEC-Q200	Yes	ROHS3	Not For New Designs
ESR18EZPF1001	Rohm Semiconductor	1 kΩ	±1%	0.5	1206	±100ppm/°C	-55~155°C	Automotive AEC-Q200, Pulse Withstanding	Yes	ROHS3	Active
KTR18EZPF1001	Rohm Semiconductor	1 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Automotive AEC-Q200, High Voltage	Yes	ROHS3	Active

Engineering Selection Recommendations

For direct replacement in non-automotive applications: RMCF1206FT1K00 (Stackpole) provides identical electrical performance with automotive AEC-Q200 qualification, maintaining the same anti-sulfur composition and active product status.

For automotive applications requiring AEC-Q200 certification: CRCW12061K00FKEA (Vishay Dale), AF1206FR-071KL (YAGEO), AC1206FR-071KL (YAGEO), KTR18EZPF1001 (Rohm), or RMCF1206FT1K00 (Stackpole) are all qualified alternatives with active product status and ROHS3 compliance.

For applications requiring enhanced power dissipation: CRCW12061K00FKEAHP (Vishay Dale, 0.75W) or ESR18EZPF1001 (Rohm, 0.5W) provide higher power ratings while maintaining all core electrical specifications and automotive qualification.

For moisture-resistant applications: AC1206FR-071KL (YAGEO) or CR1206-FX-1001ELF (Bourns) offer moisture resistance features with full ROHS3 compliance.

Parts to avoid for new designs: ERJ-8ENF1001V (Panasonic) carries "Not For New Designs" status. CRCW12061K00FKTA (Vishay Dale) is RoHS non-compliant and REACH affected.

Frequently Asked Questions (FAQ)

Q: Can RMCS1206FT1K00 be replaced with any 1 kOhms 1206 resistor?

A: No. Substitutes must match all core parameters: 1 kOhms resistance, ±1% tolerance, 0.25W power rating, 1206 package, ±100ppm/°C temperature coefficient, and -55°C to 155°C operating range. Additional features such as automotive qualification or anti-sulfur composition do not prevent substitution but may be required by specific application standards.

Q: What is the difference between RMCS1206FT1K00 and RMCF1206FT1K00?

A: Both are Stackpole 1 kOhms ±1% 0.25W 1206 resistors with identical electrical specifications. RMCF1206FT1K00 includes automotive AEC-Q200 qualification, making it suitable for automotive applications. RMCS1206FT1K00 includes anti-sulfur protection. Both are ROHS3 compliant and active products.

Q: Can I use ESR18EZPF1001 (0.5W) instead of RMCS1206FT1K00 (0.25W)?

A: Yes. ESR18EZPF1001 meets all core electrical parameters and operates in the same temperature range. The higher power rating (0.5W vs 0.25W) is a superset capability and does not prevent substitution. However, physical dimensions differ slightly (0.126" L x 0.063" W vs 0.122" L x 0.061" W), requiring PCB layout verification.

Q: Are there RoHS compliance concerns with any substitutes?

A: CRCW12061K00FKTA is RoHS non-compliant and REACH affected. All other listed substitutes are ROHS3 compliant. For applications requiring RoHS compliance, avoid CRCW12061K00FKTA.

Q: Which substitute has the best availability?

A: ERJ-8ENF1001V (Panasonic) has the highest inventory at 360,085 units. However, this part carries "Not For New Designs" status. For active products, CRCW12061K00FKEA (Vishay Dale) has 60,200 units and RMCF1206FT1K00 (Stackpole) has 484,440 units in stock.

Q: Do all substitutes have the same package dimensions?

A: No. While all use the 1206 (3216 Metric) package designation, physical dimensions vary slightly. RMCS1206FT1K00 measures 0.122" L x 0.061" W (3.10mm x 1.55mm). Most substitutes measure 0.126" L x 0.063" W (3.20mm x 1.60mm). Height also varies from 0.024" to 0.030" maximum. PCB layout must accommodate these dimensional tolerances.

Q: What does "Pulse Withstanding" mean in ESR18EZPF1001 and CRCW12061K00FKEAHP?

A: Pulse withstanding capability indicates the component can tolerate transient overvoltage or overcurrent pulses beyond normal operating conditions. This feature does not affect DC electrical specifications but provides enhanced reliability in applications with voltage spikes or surge events.

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