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RMCS1206FT4K22 Equivalent & Substitute Parts
Part Overview
The RMCS1206FT4K22 is a 4.22 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 to address supply chain variations, application-specific requirements such as automotive qualification, or design flexibility across multiple sourcing options.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Resistance | 4.22 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 |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the RMCS1206FT4K22 is determined by strict equivalence across the following parameters:
- Resistance value: 4.22 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 ~ 155°C
- RoHS compliance: ROHS3 Compliant
- Moisture sensitivity: MSL 1
All substitute parts listed meet these core electrical and mechanical specifications. Variations in physical dimensions (length, width, height) within standard tolerances and differences in additional features (automotive AEC-Q200 qualification, moisture resistance enhancements) do not affect functional substitutability for applications requiring the base electrical parameters.
Parameter Comparison
| Part Number | Manufacturer | Resistance | Tolerance | Power (W) | Package | Temp Coeff | Op. Temp Range | RoHS | MSL | Product Status | Features |
|---|---|---|---|---|---|---|---|---|---|---|---|
| RMCS1206FT4K22 | Stackpole Electronics Inc | 4.22 kΩ | ±1% | 0.25 | 1206 | ±100ppm/°C | -55°C ~ 155°C | ROHS3 | 1 | Active | Anti-Sulfur |
| AC1206FR-074K22L | YAGEO | 4.22 kΩ | ±1% | 0.25 | 1206 | ±100ppm/°C | -55°C ~ 155°C | ROHS3 | 1 | Active | Automotive AEC-Q200, Moisture Resistant |
| CR1206-FX-4221ELF | Bourns Inc. | 4.22 kΩ | ±1% | 0.25 | 1206 | ±100ppm/°C | -55°C ~ 155°C | ROHS3 | 1 | Active | Moisture Resistant |
| CRCW12064K22FKEA | Vishay Dale | 4.22 kΩ | ±1% | 0.25 | 1206 | ±100ppm/°C | -55°C ~ 155°C | ROHS3 | 1 | Active | Automotive AEC-Q200 |
| ERJ-8ENF4221V | Panasonic Electronic Components | 4.22 kΩ | ±1% | 0.25 | 1206 | ±100ppm/°C | -55°C ~ 155°C | ROHS3 | 1 | Not For New Designs | Automotive AEC-Q200 |
| RC1206FR-074K22L | YAGEO | 4.22 kΩ | ±1% | 0.25 | 1206 | ±100ppm/°C | -55°C ~ 155°C | ROHS3 | 1 | Active | Moisture Resistant |
Engineering Selection Recommendations
All listed substitute parts are electrically and mechanically equivalent to the RMCS1206FT4K22 and are suitable for direct replacement in applications requiring 4.22 kOhms ±1% 0.25W 1206 thick film resistors.
For new designs, select from parts with Active product status: AC1206FR-074K22L, CR1206-FX-4221ELF, CRCW12064K22FKEA, or RC1206FR-074K22L. The ERJ-8ENF4221V is marked "Not For New Designs" and should be used only for legacy system maintenance or existing inventory management.
For automotive applications requiring AEC-Q200 qualification, use AC1206FR-074K22L, CRCW12064K22FKEA, or ERJ-8ENF4221V. For general-purpose applications without automotive requirements, all Active-status parts are suitable.
Frequently Asked Questions (FAQ)
Q: Can I substitute the RMCS1206FT4K22 with any of the listed parts?
A: Yes. All listed parts meet the core electrical specifications (4.22 kOhms ±1%, 0.25W, 1206 package, ±100ppm/°C, -55°C ~ 155°C operating range) and RoHS3 compliance. Physical dimension variations within standard tolerances do not affect functional compatibility.
Q: What is the difference between parts with and without AEC-Q200 qualification?
A: AEC-Q200 qualification indicates the part meets automotive industry reliability standards. Parts with this rating (AC1206FR-074K22L, CRCW12064K22FKEA, ERJ-8ENF4221V) are suitable for automotive applications. Parts without this rating (CR1206-FX-4221ELF, RC1206FR-074K22L) are suitable for general-purpose and industrial applications.
Q: Why is ERJ-8ENF4221V marked "Not For New Designs"?
A: This designation indicates the manufacturer is phasing out this part number. While it remains functionally equivalent and suitable for existing designs or legacy system support, new designs should use Active-status alternatives such as CRCW12064K22FKEA or AC1206FR-074K22L.
Q: Are there physical dimension differences between substitute parts?
A: Minor variations exist within standard tolerances. Length ranges from 0.122" to 0.126" (3.10mm to 3.20mm), width from 0.061" to 0.063" (1.55mm to 1.60mm), and height from 0.024" to 0.030" (0.60mm to 0.75mm). These variations do not affect PCB layout compatibility for standard 1206 footprints.
Q: What does MSL 1 (Unlimited) mean?
A: Moisture Sensitivity Level 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed parts carry this rating.
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