RL-1005-2-R549-FNH Equivalent & Substitute Parts

Part Overview

The RL-1005-2-R549-FNH is a 549 mOhms ±1% 1/8W chip resistor in 0402 (1005 Metric) package manufactured by Delta Electronics/Cyntec. This metal film current sense resistor is designed for precision applications requiring low resistance values with tight tolerance specifications. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance requirements. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substiute Parts

RL-1005-2-R549-FNH

Delta Electronics/CyntecIn Stock: 1169RL-1005-2-R549-FNH Datasheet

Current PartRFQ

PT0805FR-070R549L

YAGEOIn Stock: 895PT0805FR-070R549L Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the RL-1005-2-R549-FNH is determined by the following critical parameters:

• Resistance value: 549 mOhms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 0.125W minimum (1/8W)
• Temperature coefficient: ±100ppm/°C or better
• Compliance: ROHS3 and REACH unaffected status
• Moisture sensitivity: MSL 1 or better
• Application suitability: Current sense capability

The substitute part PT0805FR-070R549L from YAGEO meets all critical electrical parameters. The primary difference is the package size change from 0402 to 0805 (2012 Metric), which represents a physical size increase but maintains electrical equivalence for the specified resistance, tolerance, and power rating requirements.

Parameter Comparison

Engineering Selection Recommendations

The PT0805FR-070R549L serves as an active substitute for the obsolete RL-1005-2-R549-FNH. Both parts maintain identical electrical specifications: 549 mOhms resistance, ±1% tolerance, 0.125W power rating, and ±100ppm/°C temperature coefficient. Both are ROHS3 compliant with MSL 1 rating and REACH unaffected status.

The substitute part offers extended operating temperature range (-55°C to 155°C versus -55°C to 125°C) and includes AEC-Q200 automotive qualification. The package size increase from 0402 to 0805 requires PCB layout modification but does not affect electrical performance for current sense applications.

Selection of PT0805FR-070R549L is appropriate for applications where PCB space permits the larger 0805 package footprint and where active product availability is required.

Frequently Asked Questions (FAQ)

Q: Can PT0805FR-070R549L directly replace RL-1005-2-R549-FNH without circuit modification?

A: Electrical substitution is valid. The resistance value, tolerance, power rating, and temperature coefficient are identical. PCB layout modification is required due to package size change from 0402 to 0805 (2012 Metric).

Q: What is the physical size difference between these packages?

A: The 0402 package measures 0.039" L x 0.020" W (1.00mm x 0.50mm) with 0.020" maximum height. The 0805 package measures 0.079" L x 0.049" W (2.00mm x 1.25mm) with 0.026" maximum height.

Q: Are both parts suitable for current sense applications?

A: Yes. Both parts are specified for current sense applications and maintain the required electrical characteristics for this function.

Q: What compliance certifications apply to both parts?

A: Both parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited moisture sensitivity) rating. The substitute part additionally carries AEC-Q200 automotive qualification.

Q: Why is the main part listed as obsolete?

A: The RL-1005-2-R549-FNH is classified as obsolete by the manufacturer. The PT0805FR-070R549L is an active product from YAGEO, ensuring continued availability for production requirements.

Q: Does the composition difference (Metal Film vs. Thick Film) affect substitution validity?

A: Both compositions meet the specified electrical parameters. The tolerance, temperature coefficient, and power rating requirements are satisfied by both technologies for this application.