ERO-S2PHF3900 Equivalent & Substitute Parts

Part Overview

The ERO-S2PHF3900 is a 390 Ohms ±1% 0.25W (1/4W) through-hole resistor with axial metal film construction, manufactured by Panasonic Electronic Components. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support, maintenance, and production continuity. The ERO series metal film resistor provides precision tolerance and stable temperature characteristics suitable for general-purpose analog and signal conditioning applications.

Substiute Parts

ERO-S2PHF3900

Panasonic Electronic ComponentsIn Stock: 775ERO-S2PHF3900 Datasheet

Current PartRFQ

RNMF14FTC390R

Stackpole Electronics IncIn Stock: 16277RNMF14FTC390R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ERO-S2PHF3900 is determined by strict equivalence across the following critical parameters:

• Resistance Value: 390 Ohms (exact match required)
• Tolerance: ±1% (precision class requirement)
• Power Rating: 0.25W / 1/4W (thermal dissipation capacity)
• Composition: Metal Film (electrical performance and stability characteristics)
• Package Type: Axial (mechanical and PCB layout compatibility)
• Temperature Coefficient: ±50ppm/°C (frequency and temperature stability)
• Operating Temperature Range: Minimum -55°C to 150°C (environmental operating envelope)

The RNMF14FTC390R from Stackpole Electronics Inc meets all substitution criteria. This part maintains identical electrical specifications while offering active product status and enhanced features including flame retardant coating and safety-rated construction.

Parameter Comparison

Engineering Selection Recommendations

The RNMF14FTC390R is a direct functional equivalent for the obsolete ERO-S2PHF3900. Selection of this substitute is supported by:

• Electrical Equivalence: Identical resistance, tolerance, power rating, temperature coefficient, and composition ensure drop-in compatibility for circuit performance.
• Active Product Status: The RNMF14FTC390R maintains active manufacturing status with confirmed inventory availability (16,209 pcs), ensuring long-term supply chain reliability.
• Enhanced Operating Range: The substitute provides an extended upper operating temperature limit of 155°C versus 150°C, offering additional thermal margin.
• Compliance Certifications: The RNMF14FTC390R is RoHS3 compliant and REACH unaffected, meeting current regulatory requirements.
• Physical Compatibility: Minor dimensional variations (0.003" diameter and 0.004" length increases) remain within standard PCB layout tolerances for axial through-hole components.

Frequently Asked Questions (FAQ)

Q: Can the RNMF14FTC390R replace the ERO-S2PHF3900 in existing designs?

A: Yes. Both components share identical electrical specifications (390 Ohms, ±1%, 0.25W, metal film, ±50ppm/°C). The minor physical dimension differences are within standard PCB hole tolerances for axial resistors and do not affect mechanical or electrical performance.

Q: What is the significance of the flame retardant coating on the RNMF14FTC390R?

A: The flame retardant coating and safety-rated construction on the Stackpole part provide enhanced safety characteristics. This is an additional feature that does not alter the core electrical performance but may improve compliance with specific safety standards in certain applications.

Q: Are there any temperature range considerations when substituting?

A: The RNMF14FTC390R operates from -55°C to 155°C, which exceeds the original ERO-S2PHF3900 range of -55°C to 150°C. This provides additional thermal margin and is fully compatible with the original specification envelope.

Q: How do the physical dimensions affect PCB layout?

A: The RNMF14FTC390R is 0.003" larger in diameter and 0.004" longer than the original part. Standard PCB through-hole designs accommodate these minor variations without modification. Verify hole spacing and clearances in space-constrained layouts.

Q: What is the packaging format for the substitute part?

A: The RNMF14FTC390R is supplied in Cut Tape (CT) packaging, suitable for both manual assembly and automated pick-and-place operations. The original ERO-S2PHF3900 packaging format was not specified in available data.

Q: Are there compliance or certification differences?

A: The RNMF14FTC390R is RoHS3 compliant and REACH unaffected. Both parts carry EAR99 ECCN classification and identical HTSUS codes (8533.21.0090), indicating equivalent regulatory treatment for export and trade purposes.