CRL1206-FW-R051ELF Equivalent & Substitute Parts

Part Overview

The CRL1206-FW-R051ELF is a 51 milliohm thick film chip resistor manufactured by Bourns Inc. in the 1206 (3216 Metric) package format. This component is rated for 0.5W (1/2W) power dissipation with ±1% tolerance and operates across a temperature range of -55°C to 125°C. The part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical performance specifications while offering improved availability and current product status.

Substiute Parts

CRL1206-FW-R051ELF

Bourns Inc.In Stock: 854CRL1206-FW-R051ELF Datasheet

Current PartRFQ

CRM1206-FX-R051ELF

Bourns Inc.In Stock: 31010CRM1206-FX-R051ELF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CRL1206-FW-R051ELF is determined by strict alignment with the following electrical and mechanical parameters:

Mandatory Matching Criteria:

• Resistance value: 51 mOhms
• Tolerance: ±1% (substitutes with equal or tighter tolerance are acceptable)
• Power rating: 0.5W minimum (equal or higher ratings are acceptable)
• Package format: 1206 (3216 Metric)
• Number of terminations: 2
• Composition: Thick Film

Compliance Requirements:

• RoHS3 compliance status
• Moisture Sensitivity Level 1 classification
• REACH unaffected status

The CRM1206-FX-R051ELF qualifies as a direct substitute based on matching all mandatory electrical parameters, identical package specifications, and equivalent regulatory compliance certifications. The substitute part is manufactured by the same supplier (Bourns Inc.) and maintains functional equivalence for circuit applications requiring 51 milliohm current sense resistors in 1206 package format.

Parameter Comparison

Engineering Selection Recommendations

The CRM1206-FX-R051ELF is a qualified direct substitute for the obsolete CRL1206-FW-R051ELF based on the following engineering criteria:

Electrical Equivalence: Both parts maintain identical resistance values (51 mOhms), tolerance specifications (±1%), and power ratings (0.5W). The substitute part demonstrates superior temperature coefficient performance (±100ppm/°C versus ±200ppm/°C), providing enhanced stability across operating conditions.

Physical Compatibility: Package format, footprint, and termination configuration are identical between the main part and substitute. Both components are specified in 1206 (3216 Metric) format with two terminations, ensuring direct PCB layout compatibility without design modifications.

Regulatory Compliance: Both parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 moisture sensitivity classification. Substitution does not introduce regulatory compliance risks or require updated documentation for restricted substance declarations.

Product Availability: The substitute part (CRM1206-FX-R051ELF) is classified as active with substantial inventory availability (30,951 pieces), compared to the obsolete status of the main part. This substitution addresses supply chain continuity for ongoing production and new design implementations.

Extended Operating Range: The substitute part supports an extended operating temperature range (-55°C to 155°C) compared to the main part (-55°C to 125°C), providing additional thermal margin for applications operating at elevated temperatures.

Frequently Asked Questions (FAQ)

Q: Can the CRM1206-FX-R051ELF be used as a direct replacement for the CRL1206-FW-R051ELF without PCB modifications?

A: Yes. Both parts are specified in identical 1206 (3216 Metric) package format with matching footprints and two-terminal configurations. No PCB layout changes are required for substitution.

Q: What is the primary reason for substituting the CRL1206-FW-R051ELF?

A: The CRL1206-FW-R051ELF is classified as obsolete. The CRM1206-FX-R051ELF is an active product with current manufacturing and availability, ensuring supply chain continuity for production and new designs.

Q: Are the electrical specifications identical between these two parts?

A: The resistance value (51 mOhms), tolerance (±1%), and power rating (0.5W) are identical. The substitute part features a superior temperature coefficient (±100ppm/°C versus ±200ppm/°C) and extended operating temperature range (-55°C to 155°C versus -55°C to 125°C).

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both the CRL1206-FW-R051ELF and CRM1206-FX-R051ELF are ROHS3 compliant, REACH unaffected, and classified as MSL 1 (Unlimited moisture sensitivity level). Substitution does not introduce compliance risks.

Q: What is the difference between the CRL and CRM series designations?

A: The CRL1206 series is obsolete. The CRM1206 series is the current active product line from Bourns Inc. for 1206 package thick film resistors. The CRM1206-FX variant includes current sense features and improved performance characteristics.

Q: Are there any packaging format differences between these parts?

A: The main part (CRL1206-FW-R051ELF) is specified without explicit packaging notation. The substitute part (CRM1206-FX-R051ELF) is supplied in Tape & Reel (TR) format. Both maintain identical component specifications and 1206 package dimensions.

Q: Can the CRM1206-FX-R051ELF be used in applications with operating temperatures above 125°C?

A: The CRM1206-FX-R051ELF supports operating temperatures up to 155°C, compared to the main part's 125°C maximum. This extended range makes the substitute suitable for higher-temperature applications within the specified limits.

Q: Is the substitute part suitable for current sense applications?

A: Yes. The CRM1206-FX-R051ELF is designated as a current sense resistor and is appropriate for applications requiring precision current measurement in the 51 milliohm range.