NF15AA0200M Inrush Current Limiter - Equivalent & Substitute Parts

Part Overview

The NF15AA0200M is a 20 Ohm inrush current limiter manufactured by KYOCERA AVX, designed for thermal management in power supply circuits. This component operates at a steady-state maximum current of 3.1 A with a resistance tolerance of ±20%. The part is currently obsolete, making identification of compatible substitutes essential for ongoing system support and component procurement.

Substiute Parts

NF15AA0200M--

KYOCERA AVXIn Stock: 857NF15AA0200M-- Datasheet

Current PartRFQ

SL12 20003

AmethermIn Stock: 3830SL12 20003 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NF15AA0200M is determined by the following critical parameters:

• Resistance value: 20 Ohms (primary electrical specification)
• Tolerance: ±20% (acceptable variance range)
• Steady-state current rating: minimum 3.0 A (operational threshold)
• Resistance at operating current: within acceptable thermal performance range
• Physical form factor: cylindrical inrush current limiter
• Moisture sensitivity: MSL 1 or equivalent

The SL12 20003 from Ametherm meets these substitution criteria. While the diameter is reduced from 0.591" to 0.512" and the steady-state current is rated at 3.0 A (versus 3.1 A), the core electrical parameters—resistance, tolerance, and thermal characteristics—remain compatible for equivalent circuit performance.

Parameter Comparison

Engineering Selection Recommendations

The SL12 20003 is the manufacturer-recommended substitute for the NF15AA0200M. Selection is based on:

• Electrical equivalence: identical resistance and tolerance specifications ensure circuit performance parity
• Current rating: the 3.0 A steady-state maximum is sufficient for applications designed for 3.1 A operation, with a 0.1 A margin
• Thermal characteristics: resistance at operating current (487 mOhms) remains within the acceptable performance envelope
• Compliance advantage: the SL12 20003 is ROHS3 compliant, addressing regulatory requirements that the obsolete NF15AA0200M does not meet
• Active product status: the SL12 20003 is in active production, ensuring long-term availability and supply chain stability
• Physical compatibility: the reduced diameter (13.00 mm versus 15.00 mm) provides a smaller footprint while maintaining lead spacing compatibility

Frequently Asked Questions (FAQ)

Q: Can the SL12 20003 be used as a direct replacement for the NF15AA0200M in existing designs?

A: Yes. The SL12 20003 meets the core electrical specifications (20 Ohms, ±20% tolerance) and current rating requirements. The reduced physical diameter may require PCB layout verification to confirm mechanical fit, but electrical performance is equivalent.

Q: What is the significance of the 0.1 A difference in steady-state current rating?

A: The NF15AA0200M is rated for 3.1 A maximum, while the SL12 20003 is rated for 3.0 A. For applications operating below 3.0 A, this difference is not a limiting factor. Applications requiring operation above 3.0 A should be evaluated against the SL12 20003 thermal characteristics.

Q: Does the smaller diameter of the SL12 20003 affect circuit performance?

A: No. The diameter reduction (15.00 mm to 13.00 mm) is a physical characteristic only. Electrical performance is determined by resistance, tolerance, and current rating, which are equivalent. PCB layout and mechanical mounting must be verified for the smaller form factor.

Q: Is the SL12 20003 RoHS compliant?

A: Yes. The SL12 20003 is ROHS3 compliant, whereas the NF15AA0200M is non-compliant. This represents a regulatory advantage for new designs and systems subject to RoHS requirements.

Q: What is the lead spacing difference between these parts?

A: The NF15AA0200M has 7.62 mm lead spacing; the SL12 20003 has 7.80 mm lead spacing. This 0.18 mm difference is within standard PCB tolerance and does not prevent direct substitution in most applications.

Q: Why is the NF15AA0200M listed as obsolete?

A: Obsolescence indicates the part is no longer in active production. The SL12 20003 is the active equivalent, ensuring continued availability and support for this inrush current limiter function.