NF08AA0809M Inrush Current Limiter - Equivalent & Substitute Parts

Part Overview

The NF08AA0809M is an inrush current limiter manufactured by KYOCERA AVX, rated at 8 ohms with ±20% tolerance and a maximum steady-state current of 2.7 A. The component features an 8mm (0.315") diameter cylindrical form factor with 7.62mm lead spacing. This part is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

NF08AA0809M--

KYOCERA AVXIn Stock: 976NF08AA0809M-- Datasheet

Current PartRFQ

B57236S0809L002

EPCOS - TDK ElectronicsIn Stock: 878B57236S0809L002 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NF08AA0809M is determined by the following critical parameters:

• Resistance value: 8 ohms (primary electrical requirement)
• Tolerance specification: ±20% maximum acceptable deviation
• Steady-state current rating: minimum 2.7 A required
• Physical form factor: cylindrical inrush current limiter package
• Thermal and electrical performance characteristics at rated current

The B57236S0809L002 qualifies as a substitute based on matching the core resistance value (8 ohms), exceeding the current rating requirement (3.7 A vs. 2.7 A), and maintaining compatible electrical performance. Tolerance improvement (±15% vs. ±20%) and enhanced RoHS compliance represent secondary advantages in the substitution.

Parameter Comparison

Engineering Selection Recommendations

The B57236S0809L002 is an active product with current manufacturing support, eliminating obsolescence risk associated with the NF08AA0809M. The substitute meets or exceeds all critical electrical parameters: identical 8-ohm resistance, improved tolerance specification (±15%), and higher steady-state current capacity (3.7 A).

Physical dimensions differ: the B57236S0809L002 has a larger diameter (11.50mm vs. 8.00mm) and shorter lead spacing (5.00mm vs. 7.62mm). PCB layout and mechanical clearance verification is required before implementation.

The B57236S0809L002 carries UL approval and ROHS3 compliance, providing regulatory advantages over the non-compliant original part. REACH status differs between the two components; compliance requirements for your application must be evaluated independently.

Frequently Asked Questions (FAQ)

Q: Can the B57236S0809L002 directly replace the NF08AA0809M without circuit modification?

A: Electrical substitution is valid based on matching 8-ohm resistance and exceeding current requirements. Physical form factor differences (diameter and lead spacing) require PCB layout assessment. No circuit modifications are necessary if mechanical fit is accommodated.

Q: What is the significance of the tolerance difference (±20% vs. ±15%)?

A: The substitute part offers tighter tolerance control. If your circuit design depends on the ±20% tolerance band of the original part, the ±15% specification of the substitute remains compatible and provides improved precision.

Q: Does the higher current rating (3.7 A vs. 2.7 A) affect circuit operation?

A: No. The higher rating indicates greater thermal capacity and margin. The component will operate identically at the original design current of 2.7 A or lower.

Q: Are there mechanical constraints with the larger diameter?

A: The B57236S0809L002 diameter is 11.50mm compared to 8.00mm for the original. Lead spacing is also reduced (5.00mm vs. 7.62mm). Verify available PCB space and component placement clearances before selection.

Q: What compliance considerations apply to this substitution?

A: The substitute is ROHS3 compliant and carries UL approval, whereas the original is RoHS non-compliant. If your application requires RoHS compliance, the substitute provides regulatory alignment. REACH status differs; confirm applicability to your supply chain requirements.