RMCS1206FT1K33 Equivalent & Substitute Parts

Part Overview

The RMCS1206FT1K33 is a 1.33 kOhms ±1% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Stackpole Electronics Inc. This component is actively produced and widely used in general-purpose applications requiring precision resistive elements with anti-sulfur protection. Substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design requirements mandate specific certifications such as automotive AEC-Q200 qualification or alternative moisture-resistant formulations.

Key Parameters

Parameter	Value
Resistance	1.33 kOhms
Tolerance	±1%
Power Rating	0.25W (1/4W)
Package	1206 (3216 Metric)
Composition	Thick Film
Temperature Coefficient	±100ppm/°C
Operating Temperature Range	-55°C to 155°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the RMCS1206FT1K33 is determined by strict equivalence across the following parameters:

Resistance value: 1.33 kOhms
Tolerance: ±1%
Power rating: 0.25W (1/4W)
Package designation: 1206 (3216 Metric)
Composition: Thick Film
Temperature coefficient: ±100ppm/°C
Operating temperature range: -55°C to 155°C
RoHS3 compliance
MSL rating: 1 (Unlimited)

All substitute parts listed meet these core electrical and mechanical requirements. Variations in physical dimensions (length, width, height) within the 1206 package specification, feature enhancements (automotive AEC-Q200 certification, moisture resistance), and product status differences are noted but do not disqualify substitution eligibility.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op. Temp Range	Features	Product Status
RMCS1206FT1K33	Stackpole Electronics Inc	1.33 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Anti-Sulfur	Active
AC1206FR-071K33L	YAGEO	1.33 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200, Moisture Resistant	Active
CR1206-FX-1331ELF	Bourns Inc.	1.33 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	Active
CRCW12061K33FKEA	Vishay Dale	1.33 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active
ERJ-8ENF1331V	Panasonic Electronic Components	1.33 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Not For New Designs
RC1206FR-071K33L	YAGEO	1.33 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	Active

Engineering Selection Recommendations

For Active Production Designs: AC1206FR-071K33L (YAGEO), CR1206-FX-1331ELF (Bourns Inc.), CRCW12061K33FKEA (Vishay Dale), and RC1206FR-071K33L (YAGEO) are all suitable direct substitutes with Active product status. Selection among these options depends on design-specific requirements:

If automotive AEC-Q200 certification is required, select AC1206FR-071K33L or CRCW12061K33FKEA.
If moisture resistance is the primary enhancement criterion without automotive qualification, select CR1206-FX-1331ELF or RC1206FR-071K33L.
If no additional certifications or features are mandated, any Active-status substitute maintains electrical and mechanical equivalence.

For Legacy or Existing Designs: ERJ-8ENF1331V (Panasonic Electronic Components) is electrically and mechanically equivalent but carries "Not For New Designs" status. This part remains suitable for sustaining production or replacement in existing applications where supply of the primary part is unavailable.

Frequently Asked Questions (FAQ)

Q: Can I substitute RMCS1206FT1K33 with any of the listed parts without circuit redesign? A: Yes. All listed substitute parts maintain identical resistance value (1.33 kOhms), tolerance (±1%), power rating (0.25W), package (1206), and operating temperature range (-55°C to 155°C). No circuit redesign is required for electrical compatibility.

Q: What is the difference between the anti-sulfur feature of RMCS1206FT1K33 and the moisture-resistant features of substitute parts? A: Anti-sulfur protection and moisture resistance are distinct protective mechanisms. The RMCS1206FT1K33 specifically addresses sulfur contamination in high-sulfur environments. Substitute parts with moisture-resistant formulations address humidity and moisture ingress. Selection depends on the specific environmental conditions of the application.

Q: Are there physical dimension differences between the main part and substitutes? A: Minor variations exist within the 1206 package specification. The RMCS1206FT1K33 measures 0.122" L × 0.061" W × 0.026" H (max). Substitute parts range from 0.122" to 0.126" in length and 0.061" to 0.063" in width, with heights from 0.024" to 0.030" (max). These variations remain within 1206 package tolerances and do not affect PCB footprint compatibility.

Q: Should I use ERJ-8ENF1331V if it is marked "Not For New Designs"? A: ERJ-8ENF1331V is electrically and mechanically equivalent and remains available in inventory. Use this part only for sustaining production of existing designs or emergency replacement scenarios. For new design initiation, select from parts with Active product status.

Q: Do all substitute parts have the same RoHS and MSL ratings? A: Yes. All listed parts are ROHS3 Compliant with MSL rating 1 (Unlimited), matching the primary part specification.

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