NF15AA0139M Inrush Current Limiter - Equivalent & Substitute Parts

Part Overview

The NF15AA0139M is an inrush current limiter manufactured by KYOCERA AVX, rated at 1.3 Ohms ±20% with a maximum steady-state current of 8.9 A and a 15mm diameter form factor. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The NF15 series has been discontinued, necessitating evaluation of active alternative components that meet the electrical and mechanical requirements of the original specification.

Substiute Parts

NF15AA0139M--

KYOCERA AVXIn Stock: 857NF15AA0139M-- Datasheet

Current PartRFQ

SL12 1R010

AmethermIn Stock: 12156SL12 1R010 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NF15AA0139M is determined by the following critical electrical and mechanical parameters:

• Resistance Value: Nominal 1.3 Ohms with ±20% tolerance range (1.04 to 1.56 Ohms)
• Steady-State Current Rating: Minimum 8.9 A capability
• Resistance at Operating Current: Performance characteristic at rated current
• Physical Form Factor: Diameter and lead spacing compatibility for PCB mounting
• Tolerance Class: ±20% tolerance specification
• Environmental Classification: Moisture Sensitivity Level 1 (Unlimited)

The SL12 1R010 from Ametherm qualifies as a substitute based on comparable electrical performance within the tolerance band and compatible physical dimensions, despite minor variations in nominal resistance and current rating.

Parameter Comparison

Engineering Selection Recommendations

The SL12 1R010 serves as a functional substitute for the obsolete NF15AA0139M based on the following criteria:

Electrical Compatibility: Both components operate within the ±20% tolerance class. The SL12 1R010 nominal resistance of 1.0 Ohms falls within the acceptable tolerance band of the NF15AA0139M (1.04 to 1.56 Ohms at ±20%). The substitute's higher steady-state current rating of 10 A exceeds the original 8.9 A specification, providing operational margin.

Physical Compatibility: Lead spacing differs by 0.18mm (7.62mm to 7.80mm), which remains within standard PCB manufacturing tolerances. The diameter reduction from 15mm to 13mm requires verification of PCB clearance and thermal management considerations in the application.

Compliance Status: The SL12 1R010 is classified as active product status with ROHS3 compliance, addressing regulatory requirements that the obsolete NF15AA0139M does not meet. Both components share identical Moisture Sensitivity Level 1 classification and REACH Unaffected status.

Thermal Performance: The substitute exhibits lower hot resistance (27 mOhms versus 50 mOhms), resulting in reduced power dissipation during steady-state operation. This characteristic may require thermal design re-evaluation in applications with tight thermal budgets.

Frequently Asked Questions (FAQ)

Q: Can the SL12 1R010 be used as a direct replacement for the NF15AA0139M?

A: The SL12 1R010 qualifies as a functional substitute based on electrical parameters and tolerance class. Physical form factor differences (diameter and lead spacing) require PCB layout verification. Thermal performance improvements in the substitute may necessitate design review.

Q: What is the resistance tolerance overlap between these components?

A: The NF15AA0139M tolerance range is 1.04 to 1.56 Ohms (±20% of 1.3 Ohms). The SL12 1R010 tolerance range is 0.8 to 1.2 Ohms (±20% of 1.0 Ohms). The overlap region is 1.04 to 1.2 Ohms, ensuring compatibility within this band.

Q: Does the smaller diameter of the SL12 1R010 affect mounting?

A: The 2mm diameter reduction (15mm to 13mm) may affect PCB footprint and thermal dissipation characteristics. Verify that the application PCB layout accommodates the smaller form factor and that thermal management remains adequate for the application current profile.

Q: What are the lead spacing implications?

A: Lead spacing increases from 7.62mm to 7.80mm, a difference of 0.18mm. This falls within standard PCB manufacturing tolerances and should not present compatibility issues for typical through-hole mounting applications.

Q: How does the lower hot resistance of the substitute affect circuit performance?

A: The SL12 1R010 exhibits 27 mOhms resistance at operating current compared to 50 mOhms for the NF15AA0139M. This 46% reduction in hot resistance decreases power dissipation and heat generation, potentially improving thermal performance in the application.

Q: Is the SL12 1R010 RoHS compliant?

A: Yes, the SL12 1R010 is ROHS3 compliant, meeting current regulatory requirements. The original NF15AA0139M is RoHS non-compliant, making the substitute advantageous for applications subject to RoHS regulations.