RLW-2012-F-R030-FNH Equivalent & Substitute Parts

Part Overview

The RLW-2012-F-R030-FNH is a 30 mOhms ±1% metal film chip resistor rated at 0.333W (1/3W) in a Wide 0805 (2012 Metric) package. Designed for current sensing applications, this component is manufactured by Delta Electronics/Cyntec and is currently classified as obsolete. Due to its obsolete status, identifying equivalent and substitute parts is necessary to maintain design continuity and ensure supply chain availability for new production runs or legacy system maintenance.

Substiute Parts

RLW-2012-F-R030-FNH

Delta Electronics/CyntecIn Stock: 1207RLW-2012-F-R030-FNH Datasheet

Current PartRFQ

UCR18EVHFSR030

Rohm SemiconductorIn Stock: 1244UCR18EVHFSR030 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the RLW-2012-F-R030-FNH is determined by the following critical parameters:

• Resistance Value: 30 mOhms (exact match required)
• Tolerance: ±1% (exact match required)
• Power Rating: Minimum 0.333W (equal or higher acceptable)
• Temperature Coefficient: 0/+200 ppm/°C (exact match required)
• Operating Temperature Range: Minimum -55°C to 125°C (equal or wider acceptable)
• RoHS Compliance: ROHS3 Compliant (required)
• Moisture Sensitivity Level: MSL 1 (required)
• Application Suitability: Current sense capability (required)

The UCR18EVHFSR030 meets all substitution criteria with equivalent electrical specifications and enhanced power rating (0.5W vs. 0.333W), making it a valid substitute despite package size differences.

Parameter Comparison

Engineering Selection Recommendations

The UCR18EVHFSR030 is an active substitute for the obsolete RLW-2012-F-R030-FNH. Both components meet identical electrical specifications for resistance, tolerance, and temperature coefficient. The substitute offers a higher power rating (0.5W vs. 0.333W), which provides additional thermal margin in current sensing applications. The UCR18EVHFSR030 includes AEC-Q200 automotive qualification and operates across an extended temperature range (-55°C to 155°C vs. -55°C to 125°C). Both parts maintain ROHS3 compliance and MSL 1 rating. The primary design consideration is the package size difference: the substitute uses a larger 1206 (3216 Metric) package compared to the original Wide 0805 (2012 Metric) package, which may require PCB layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the UCR18EVHFSR030 directly replace the RLW-2012-F-R030-FNH without circuit modifications?

A: Electrical substitution is valid. The resistance value, tolerance, and temperature coefficient are identical. However, the larger 1206 package footprint requires PCB layout changes. Verify that board space accommodates the 0.126" L x 0.063" W dimensions.

Q: What is the impact of the higher power rating on circuit performance?

A: The UCR18EVHFSR030 rated at 0.5W provides greater thermal headroom than the original 0.333W rating. This does not negatively affect circuit operation; it only increases the component's ability to dissipate heat without exceeding temperature limits.

Q: Are there any compliance differences between the two parts?

A: Both parts are ROHS3 compliant with MSL 1 rating. The UCR18EVHFSR030 includes AEC-Q200 automotive qualification, which the original part does not specify. This additional qualification does not create incompatibility.

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

A: Both compositions meet the specified tolerance (±1%) and temperature coefficient (0/+200 ppm/°C). The composition difference does not prevent substitution when electrical parameters match.

Q: What should be considered for PCB redesign when switching to the UCR18EVHFSR030?

A: The substitute requires a 1206 footprint instead of Wide 0805. Verify trace routing, thermal management, and component spacing accommodate the larger package dimensions. Confirm that the extended operating temperature range (-55°C to 155°C) aligns with system requirements.