WRF1JB27R0 Equivalent & Substitute Parts

Part Overview

The WRF1JB27R0 is a 27 Ohm, 1W axial wirewound resistor manufactured by Stackpole Electronics Inc. This component features flame-proof and moisture-resistant construction with safety certification. The part is currently obsolete, necessitating identification of functionally equivalent alternatives from active product lines that maintain electrical and mechanical compatibility for through-hole axial applications.

Substiute Parts

WRF1JB27R0

Stackpole Electronics IncIn Stock: 771WRF1JB27R0 Datasheet

Current PartRFQ

CB2JBR330

Stackpole Electronics IncIn Stock: 1080CB2JBR330 Datasheet

DirectRFQ

CB2JB27R0

Stackpole Electronics IncIn Stock: 965CB2JB27R0 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the WRF1JB27R0 is determined by the following criteria:

Primary Substitution Criteria:

• Resistance value: 27 Ohms (exact match required)
• Tolerance: ±5% (matching specification)
• Composition: Wirewound (required for thermal and safety characteristics)
• Package: Axial through-hole (mechanical compatibility)
• Features: Flame Proof, Moisture Resistant, Safety (functional equivalence)

Secondary Compatibility Factors:

• Power rating: Equal to or greater than 1W
• Operating temperature range: Must encompass or exceed -55°C ~ 200°C
• RoHS compliance: ROHS3 Compliant (regulatory requirement)

The CB2JB27R0 qualifies as a manufacturer-recommended direct substitute, meeting all primary criteria with enhanced specifications. The CB2JBR330 is listed as an alternative but does not meet the primary resistance requirement and is therefore not suitable for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

CB2JB27R0 (Manufacturer-Recommended Substitute): The CB2JB27R0 is the primary substitute for the obsolete WRF1JB27R0. This part maintains identical resistance and tolerance specifications while providing enhanced power rating (2W versus 1W) and extended operating temperature range (-55°C ~ 275°C versus -55°C ~ 200°C). Both components are wirewound axial resistors with flame-proof and moisture-resistant construction. The CB2JB27R0 is currently in active production status with ROHS3 compliance and equivalent regulatory certifications. The increased power rating and improved temperature coefficient (±200 ppm/°C) provide superior performance margins in thermal and electrical stress conditions.

CB2JBR330 (Not Recommended for Direct Substitution): The CB2JBR330 does not qualify as a functional equivalent due to its resistance value of 330 mOhms, which differs fundamentally from the required 27 Ohms specification. This part cannot be used as a direct replacement in circuits designed for the WRF1JB27R0.

Frequently Asked Questions (FAQ)

Q: Can the CB2JB27R0 be used as a direct replacement for the WRF1JB27R0? A: Yes. The CB2JB27R0 maintains the same resistance value (27 Ohms), tolerance (±5%), composition (wirewound), and axial package configuration. The higher power rating (2W) and extended temperature range provide enhanced performance margins without affecting circuit compatibility.

Q: What is the significance of the power rating difference between 1W and 2W? A: The CB2JB27R0's 2W rating indicates higher thermal dissipation capability. In applications where the WRF1JB27R0 operates at or near its 1W limit, the CB2JB27R0 provides additional thermal headroom, reducing component stress and extending service life.

Q: Are the physical dimensions compatible between WRF1JB27R0 and CB2JB27R0? A: Both components use axial through-hole packaging. The WRF1JB27R0 measures 0.197" Dia x 0.433" L, while the CB2JB27R0 measures 0.252" Square x 0.709" L. Verify PCB layout and mounting clearances before substitution, as the CB2JB27R0 is physically larger.

Q: Why is CB2JBR330 listed if it cannot be substituted? A: The CB2JBR330 is documented as an alternative part from the same manufacturer series but does not meet the primary electrical requirement of 27 Ohms resistance. It is included for reference only and is not suitable for applications requiring the WRF1JB27R0 specification.

Q: Are both substitute options ROHS3 compliant? A: Yes. Both CB2JB27R0 and CB2JBR330 are ROHS3 compliant and REACH unaffected, matching the regulatory status of the WRF1JB27R0.