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RC1608F6491CS Equivalent & Substitute Parts Reference
Part Overview
The RC1608F6491CS is a 6.49 kOhms ±1% thick film chip resistor manufactured by Samsung Electro-Mechanics, rated at 0.1W (1/10W) in a 0603 (1608 Metric) surface mount package. This component is classified as Active product status with 921 pieces currently in stock. The part is designed for general-purpose applications requiring moisture-resistant thick film construction with standard industrial temperature range operation.
Substitute parts are necessary when the primary manufacturer part becomes unavailable, when alternative packaging formats are required, or when design specifications call for enhanced features such as automotive qualification or anti-sulfur protection.
Substiute Parts
Key Parameters
| Parameter | Value | Specification Basis |
|---|---|---|
| Resistance Value | 6.49 kOhms | Exact match required for substitution |
| Tolerance | ±1% | Exact match required for substitution |
| Power Rating | 0.1W (1/10W) | Exact match required for substitution |
| Package / Case | 0603 (1608 Metric) | Exact match required for substitution |
| Composition | Thick Film | Exact match required for substitution |
| Temperature Coefficient | ±100ppm/°C | Exact match required for substitution |
| Operating Temperature Range | -55°C ~ 155°C | Exact match required for substitution |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | Exact match required for substitution |
| RoHS Status | ROHS3 Compliant | Compliance consideration for substitution |
| Number of Terminations | 2 | Exact match required for substitution |
Substitute Part Grouping Explanation
Substitution logic for the RC1608F6491CS is based on strict electrical and mechanical parameter matching. All substitute parts must meet the following criteria:
Core Substitution Requirements (Non-Negotiable):
- Resistance value: 6.49 kOhms
- Tolerance: ±1%
- Power rating: 0.1W (1/10W)
- Package: 0603 (1608 Metric)
- Composition: Thick Film
- Temperature coefficient: ±100ppm/°C
- Operating temperature range: -55°C ~ 155°C
- Moisture sensitivity level: 1 (Unlimited)
- Number of terminations: 2
Compliance Considerations:
- RoHS3 compliance is preferred for general industrial applications
- REACH status affects supply chain and regulatory requirements
- AEC-Q200 automotive qualification is an optional enhancement feature
Packaging Format Variations:
- Cut Tape (CT) packaging is functionally equivalent to Tape & Reel (TR) packaging
- Packaging format does not affect electrical or mechanical performance
Substitute parts are grouped into two categories: Direct Substitutes (identical specifications and packaging format) and Similar Substitutes (identical electrical specifications with optional enhanced features such as automotive qualification or anti-sulfur protection).
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Resistance | Tolerance | Power (W) | Package | Temp Coeff | Op Temp Range | MSL | RoHS Status | Features | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| RC1608F6491CS | Samsung Electro-Mechanics | 6.49 kΩ | ±1% | 0.1 | 0603 | ±100ppm/°C | -55~155°C | 1 | ROHS3 | Moisture Resistant | Active |
| CR0603-FX-6491ELF | Bourns Inc. | 6.49 kΩ | ±1% | 0.1 | 0603 | ±100ppm/°C | -55~155°C | 1 | ROHS3 | Moisture Resistant | Active |
| RC0603FR-076K49L | YAGEO | 6.49 kΩ | ±1% | 0.1 | 0603 | ±100ppm/°C | -55~155°C | 1 | ROHS3 | Moisture Resistant | Active |
| AC0603FR-076K49L | YAGEO | 6.49 kΩ | ±1% | 0.1 | 0603 | ±100ppm/°C | -55~155°C | 1 | ROHS3 | Automotive AEC-Q200, Moisture Resistant | Active |
| AF0603FR-076K49L | YAGEO | 6.49 kΩ | ±1% | 0.1 | 0603 | ±100ppm/°C | -55~155°C | 1 | ROHS3 | Anti-Sulfur, Automotive AEC-Q200 | Active |
| CRCW06036K49FKEA | Vishay Dale | 6.49 kΩ | ±1% | 0.1 | 0603 | ±100ppm/°C | -55~155°C | 1 | ROHS3 | Automotive AEC-Q200 | Active |
| CRCW06036K49FKEB | Vishay Dale | 6.49 kΩ | ±1% | 0.1 | 0603 | ±100ppm/°C | -55~155°C | 1 | ROHS3 | Automotive AEC-Q200 | Discontinued at DiGi Electronics |
| CRCW06036K49FKTA | Vishay Dale | 6.49 kΩ | ±1% | 0.1 | 0603 | ±100ppm/°C | -55~155°C | 1 | RoHS non-compliant | Automotive AEC-Q200 | Active |
| ERJ-3EKF6491V | Panasonic Electronic Components | 6.49 kΩ | ±1% | 0.1 | 0603 | ±100ppm/°C | -55~155°C | 1 | ROHS3 | Automotive AEC-Q200 | Active |
| RMCF0603FT6K49 | Stackpole Electronics Inc | 6.49 kΩ | ±1% | 0.1 | 0603 | ±100ppm/°C | -55~155°C | 1 | ROHS3 | Automotive AEC-Q200 | Active |
Engineering Selection Recommendations
Direct Substitutes (Identical Specifications and Packaging):
CR0603-FX-6491ELF (Bourns Inc.) and RC0603FR-076K49L (YAGEO) are direct functional equivalents to the RC1608F6491CS. Both parts maintain identical electrical parameters, package dimensions, and RoHS3 compliance status. These parts are suitable for one-to-one replacement in applications where the original Samsung part is unavailable.
Automotive-Qualified Alternatives (Enhanced Features):
AC0603FR-076K49L, AF0603FR-076K49L, CRCW06036K49FKEA, ERJ-3EKF6491V, and RMCF0603FT6K49 are functionally equivalent to the RC1608F6491CS with the addition of AEC-Q200 automotive qualification. These parts meet all core electrical and mechanical specifications while providing enhanced reliability certification for automotive applications. All automotive-qualified alternatives maintain ROHS3 compliance and active product status, with the exception of CRCW06036K49FKEB, which is discontinued at DiGi Electronics.
Compliance Considerations:
CRCW06036K49FKTA (Vishay Dale) is RoHS non-compliant and REACH Affected. This part is not recommended for applications requiring RoHS3 compliance or REACH compliance verification.
Inventory Availability:
ERJ-3EKF6491V (Panasonic) offers the highest inventory availability at 162,445 pieces. RMCF0603FT6K49 (Stackpole) provides 100,154 pieces. CRCW06036K49FKEA (Vishay Dale) offers 51,278 pieces. These alternatives provide robust supply chain options for high-volume procurement.
Frequently Asked Questions (FAQ)
Q: Can I substitute RC1608F6491CS with CR0603-FX-6491ELF?
A: Yes. CR0603-FX-6491ELF is a direct substitute. Both parts share identical resistance value (6.49 kOhms), tolerance (±1%), power rating (0.1W), package (0603), temperature coefficient (±100ppm/°C), operating temperature range (-55°C ~ 155°C), and RoHS3 compliance status. Electrical and mechanical performance are equivalent.
Q: What is the difference between the standard RC1608F6491CS and the automotive-qualified alternatives?
A: The RC1608F6491CS is a general-purpose thick film resistor. Automotive-qualified alternatives (AC0603FR-076K49L, AF0603FR-076K49L, CRCW06036K49FKEA, ERJ-3EKF6491V, RMCF0603FT6K49) carry AEC-Q200 certification, indicating compliance with automotive industry reliability and testing standards. All other electrical and mechanical parameters remain identical. Automotive qualification is not required for non-automotive applications.
Q: Is AF0603FR-076K49L suitable for high-sulfur environments?
A: Yes. AF0603FR-076K49L includes anti-sulfur protection in addition to AEC-Q200 automotive qualification. This feature provides enhanced resistance to sulfur-containing atmospheres. All other specifications remain identical to the base RC1608F6491CS.
Q: Can I use CRCW06036K49FKTA as a substitute?
A: CRCW06036K49FKTA is electrically and mechanically equivalent to RC1608F6491CS. However, this part is RoHS non-compliant and REACH Affected. Use this part only in applications where RoHS3 compliance is not required and REACH compliance verification is not necessary.
Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?
A: Cut Tape and Tape & Reel are packaging format variations only. Both formats contain identical components with identical electrical and mechanical specifications. Packaging format selection depends on assembly process requirements and volume considerations. Electrical performance is not affected by packaging format.
Q: Why is CRCW06036K49FKEB listed as discontinued?
A: CRCW06036K49FKEB is discontinued at DiGi Electronics. However, this part remains electrically and mechanically equivalent to RC1608F6491CS. Alternative sources may carry inventory. Use CRCW06036K49FKEA or other active alternatives for new designs or high-volume procurement.
Q: Are all substitute parts MSL 1 (Unlimited)?
A: Yes. All listed substitute parts maintain MSL 1 (Unlimited) moisture sensitivity level, identical to the RC1608F6491CS. This specification indicates no moisture sensitivity precautions are required during storage or handling.
Q: Can I mix different manufacturers' parts in the same assembly?
A: Yes. All listed substitute parts meet identical electrical and mechanical specifications. Parts from different manufacturers can be used interchangeably in the same assembly without performance degradation, provided compliance requirements (RoHS, REACH, AEC-Q200) are met for the specific application.
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