RNMF12FTC2K21 Equivalent & Substitute Parts

Part Overview

The RNMF12FTC2K21 is a 2.21 kOhms ±1% metal film axial resistor rated at 0.5W (1/2W) manufactured by Stackpole Electronics Inc. This through-hole component features flame retardant coating and safety construction, designed for applications requiring precision resistive elements in standard axial package configurations. The part maintains active product status with 969 units in current inventory. Substitute parts are identified to address supply chain flexibility, enhanced performance specifications, or alternative sourcing requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

RNMF12FTC2K21

Stackpole Electronics IncIn Stock: 999RNMF12FTC2K21 Datasheet

Current PartRFQ

CMF552K2100FHEB

Vishay DaleIn Stock: 15758CMF552K2100FHEB Datasheet

DirectRFQ

CMF552K2100DHR6

Vishay DaleIn Stock: 1886CMF552K2100DHR6 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RNMF12FTC2K21 is determined by the following critical parameters:

Core Electrical Requirements (Non-Negotiable):

• Resistance value: 2.21 kOhms
• Power rating: 0.5W minimum
• Composition: Metal Film
• Package: Axial through-hole

Tolerance Compatibility:

• Direct substitutes must maintain ±1% tolerance or tighter (±0.5%)
• Tighter tolerance specifications represent performance upgrades

Environmental & Compliance Parameters:

• Operating temperature range must encompass or exceed -55°C ~ 155°C
• Flame retardant coating and safety features required
• RoHS3 compliance preferred for new designs

Mechanical Compatibility:

• Axial package dimensions must be compatible with PCB footprints designed for standard axial resistors
• Minor dimensional variations within industry tolerance are acceptable

The RNMF12FTC2K21 has two identified substitutes: CMF552K2100FHEB (direct equivalent) and CMF552K2100DHR6 (performance upgrade with tighter tolerance).

Parameter Comparison

Engineering Selection Recommendations

CMF552K2100FHEB (Direct Equivalent): This substitute maintains identical electrical specifications (2.21 kOhms ±1%, 0.5W) and composition (metal film axial). The part offers extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 155°C), additional moisture resistance features, and ROHS3 compliance matching the original. Higher inventory availability (15742 units) supports supply chain continuity. Packaging format differs (Cut Tape versus Tape & Reel), which may affect procurement workflows but does not impact electrical or mechanical performance.

CMF552K2100DHR6 (Performance Upgrade): This substitute provides tighter tolerance specification (±0.5% versus ±1%), representing improved precision for applications requiring closer resistive value control. Electrical and thermal characteristics remain equivalent. Extended operating temperature range (-55°C ~ 175°C) provides additional thermal margin. However, this part carries RoHS non-compliance and REACH-affected status, restricting use in regulated markets or applications with mandatory environmental compliance requirements. Selection of this substitute requires explicit compliance verification against project specifications.

Frequently Asked Questions (FAQ)

Q: Can CMF552K2100FHEB be used as a direct drop-in replacement for RNMF12FTC2K21?

A: Yes. Both parts share identical resistance (2.21 kOhms), tolerance (±1%), power rating (0.5W), composition (metal film), and axial package configuration. The CMF552K2100FHEB provides extended temperature range and moisture resistance without compromising compatibility. Packaging format differs (Cut Tape versus Tape & Reel), affecting only procurement and handling procedures, not circuit performance.

Q: What is the primary difference between CMF552K2100FHEB and CMF552K2100DHR6?

A: The CMF552K2100DHR6 offers tighter tolerance (±0.5% versus ±1%), providing superior precision for applications requiring closer resistive value control. Both maintain identical power rating, composition, and operating temperature range. The critical distinction is regulatory compliance: CMF552K2100FHEB is ROHS3 compliant and REACH unaffected, while CMF552K2100DHR6 is RoHS non-compliant and REACH affected.

Q: Should I select the tighter tolerance substitute (CMF552K2100DHR6)?

A: Tolerance selection depends on circuit requirements and regulatory constraints. Select ±0.5% tolerance only if the application circuit design explicitly requires precision better than ±1%. Verify RoHS and REACH compliance requirements before selecting CMF552K2100DHR6, as this part does not meet these environmental standards.

Q: Are there mechanical compatibility concerns with these substitutes?

A: All three parts use standard axial through-hole package configuration. Dimensional variations (RNMF12FTC2K21: 0.093" Dia x 0.250" L; CMF series: 0.090" Dia x 0.240" L) fall within industry tolerance for axial resistor footprints. No mechanical redesign is required for PCB integration.

Q: What inventory considerations apply to these substitutes?

A: RNMF12FTC2K21 has 969 units available. CMF552K2100FHEB offers significantly higher availability (15742 units), supporting extended production runs. CMF552K2100DHR6 has moderate availability (1840 units). For supply chain planning, CMF552K2100FHEB provides the most reliable sourcing option.