RNF12FTC40R2 Equivalent & Substitute Parts

Part Overview

The RNF12FTC40R2 is a 40.2 Ohm ±1% metal film axial through-hole resistor rated at 0.5W (1/2W) manufactured by Stackpole Electronics Inc. This component features flame retardant coating and safety-grade construction, designed for applications requiring precision resistance with thermal stability across industrial temperature ranges. The part maintains Active product status with 939 units in current inventory. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility allow direct replacement in circuit designs.

Substiute Parts

RNF12FTC40R2

Stackpole Electronics IncIn Stock: 990RNF12FTC40R2 Datasheet

Current PartRFQ

CMF5540R200FHEB

Vishay DaleIn Stock: 9353CMF5540R200FHEB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNF12FTC40R2 is determined by strict equivalence across the following parameters:

• Resistance value: 40.2 Ohms (exact match required)
• Tolerance: ±1% (equivalent precision class)
• Power rating: 0.5W / 1/2W (identical thermal dissipation capability)
• Composition: Metal film (same construction technology)
• Temperature coefficient: ±50ppm/°C (matching frequency stability)
• Package: Axial through-hole (mechanical compatibility)
• Regulatory compliance: ROHS3 Compliant, REACH Unaffected (environmental standards)

The CMF5540R200FHEB from Vishay Dale meets all substitution criteria. Both parts share identical electrical specifications and axial package geometry, enabling direct functional replacement in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both the RNF12FTC40R2 and CMF5540R200FHEB maintain Active product status and full ROHS3 compliance with REACH Unaffected designation, confirming regulatory equivalence for industrial and commercial applications. The CMF5540R200FHEB extends the upper operating temperature limit to 175°C compared to 155°C for the RNF12FTC40R2, providing additional thermal margin in high-temperature environments. The Vishay Dale substitute incorporates moisture-resistant construction, offering enhanced environmental protection. Physical dimensions differ slightly (CMF: 2.29mm diameter × 6.10mm length versus RNF: 2.75mm diameter × 8.75mm length), requiring verification of board layout constraints. Packaging format differs (Cut Tape versus Tape & Reel), affecting procurement and assembly workflows.

Frequently Asked Questions (FAQ)

Q: Can CMF5540R200FHEB replace RNF12FTC40R2 in existing designs?

A: Yes. Both parts share identical resistance (40.2 Ohms), tolerance (±1%), power rating (0.5W), composition (metal film), and temperature coefficient (±50ppm/°C). Axial package compatibility enables direct substitution provided board layout accommodates the dimensional differences.

Q: What are the physical dimension differences?

A: RNF12FTC40R2 measures 2.75mm diameter × 8.75mm length. CMF5540R200FHEB measures 2.29mm diameter × 6.10mm length. The Vishay part is smaller, which may affect board routing and component spacing.

Q: Does the extended temperature range of CMF5540R200FHEB affect substitution?

A: No. The CMF5540R200FHEB operating range (-55°C ~ 175°C) encompasses the RNF12FTC40R2 range (-55°C ~ 155°C). Extended upper temperature capability does not compromise compatibility.

Q: Are packaging formats interchangeable?

A: Packaging format (Tape & Reel versus Cut Tape) affects procurement and assembly processes but does not impact electrical or mechanical compatibility. Component selection depends on production volume and assembly equipment requirements.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both RNF12FTC40R2 and CMF5540R200FHEB are ROHS3 Compliant and REACH Unaffected, meeting identical environmental and safety requirements.