NS12555T331MN Equivalent & Substitute Parts

Part Overview

The NS12555T331MN is a 330 µH shielded drum core, wirewound inductor manufactured by Taiyo Yuden, rated for 960 mA continuous current with 410mOhm DC resistance. This component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. Identification of equivalent substitute parts is necessary for applications currently using this inductor, particularly where design continuity or inventory replenishment is required.

Substiute Parts

NS12555T331MN

Taiyo YudenIn Stock: 2337NS12555T331MN Datasheet

Current PartRFQ

BPSF00131355331M00

Pulse ElectronicsIn Stock: 1098BPSF00131355331M00 Datasheet

SimilarRFQ

SRR1260-331K

Bourns Inc.In Stock: 28024SRR1260-331K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the NS12555T331MN is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 330 µH (exact match required)
• Inductance tolerance: ±20% or tighter
• Core material: Ferrite shielded construction
• DC resistance: 410mOhm or lower
• Current rating: Equal to or greater than 960 mA
• Operating temperature range: -40°C to 125°C minimum
• Mounting type: Surface Mount
• Physical footprint: 12.50mm x 12.50mm base dimensions
• Compliance: ROHS3 Compliant

Secondary Compatibility Factors:

• Saturation current (Isat) should not fall below 820mA
• Self-resonant frequency should remain above 3.0 MHz
• Height variation acceptable within ±0.5mm from seated maximum

The substitute parts identified below meet these criteria within the specified tolerances for direct circuit board replacement.

Parameter Comparison

Engineering Selection Recommendations

BPSF00131355331M00 (Pulse Electronics)

This substitute provides equivalent inductance and DC resistance specifications with a higher current rating of 1 A. The part is currently Active in the manufacturer's product line, ensuring long-term availability. ROHS3 compliance and REACH Unaffected status match the original component. The saturation current of 590 mA is lower than the original 820 mA specification; applications operating near saturation limits require circuit analysis. Physical footprint and height are compatible with existing PCB layouts. Inductance testing frequency differs (1 kHz vs. 100 kHz), which may result in minor inductance value variations at operational frequencies.

SRR1260-331K (Bourns Inc.)

This substitute offers superior electrical performance with higher current rating (1.15 A), higher saturation current (1.1 A), and tighter inductance tolerance (±10% vs. ±20%). The part is Active in production with established supply chain availability. ROHS3 compliance and REACH Unaffected status are maintained. DC resistance is higher at 580 mOhm maximum, resulting in increased power dissipation compared to the original 410 mOhm specification. Physical footprint matches the original; height is 6.50 mm, representing a 0.65 mm increase from the original 5.85 mm. Self-resonant frequency of 3.2 MHz remains within acceptable operating range. Inductance testing at 100 kHz matches the original specification frequency.

Both substitutes maintain ferrite shielded construction, surface mount configuration, and full temperature range operation. Selection between these options depends on specific circuit requirements regarding saturation current performance, DC resistance losses, and available PCB clearance for height variation.

Frequently Asked Questions (FAQ)

Q: Can the BPSF00131355331M00 be used as a direct replacement for the NS12555T331MN?

A: The BPSF00131355331M00 meets the primary electrical specifications for inductance, DC resistance, and current rating. However, the saturation current is 590 mA compared to the original 820 mA. Applications where the inductor operates near saturation limits require circuit verification. Physical dimensions are compatible for PCB layout.

Q: What is the significance of the different inductance test frequencies (1 kHz vs. 100 kHz)?

A: Inductance values can vary with measurement frequency due to core material characteristics. The NS12555T331MN and SRR1260-331K are both tested at 100 kHz, providing direct comparison. The BPSF00131355331M00 is tested at 1 kHz, which may result in slightly different inductance readings at operational frequencies. Both values remain within the ±20% tolerance band.

Q: Is the height difference between SRR1260-331K (6.50 mm) and the original part (5.85 mm) a concern?

A: The 0.65 mm height increase must be evaluated against available PCB clearance in the application. If the original design has minimal vertical clearance, this difference may require layout modification. The horizontal footprint (12.50 x 12.50 mm) remains identical.

Q: Are all three parts RoHS3 compliant?

A: Yes. The NS12555T331MN, BPSF00131355331M00, and SRR1260-331K are all ROHS3 Compliant with REACH Unaffected status, meeting current environmental and regulatory requirements.

Q: Which substitute has the best long-term availability?

A: Both BPSF00131355331M00 and SRR1260-331K are classified as Active products in their respective manufacturers' product lines, ensuring continued availability. The original NS12555T331MN is classified as Not For New Designs, indicating it is being phased out.

Q: How does DC resistance affect circuit performance?

A: DC resistance directly impacts power dissipation and voltage drop across the inductor. The original part specifies 410 mOhm. The BPSF00131355331M00 matches this specification at 410 mOhm maximum. The SRR1260-331K has 580 mOhm maximum, resulting in approximately 41% higher resistive losses. Applications sensitive to power dissipation or thermal performance should account for this difference.

Q: Can the SRR1260-331K be used in all applications where the NS12555T331MN was used?

A: The SRR1260-331K provides superior electrical performance with higher current and saturation ratings, making it suitable for most applications. The higher DC resistance and increased height are the primary considerations. Circuits designed with minimal thermal margin or tight vertical clearance require evaluation.

Q: What does "Nonstandard" package type mean?

A: All three parts use nonstandard package dimensions (12.50 x 12.50 mm), indicating they do not conform to industry standard package outlines. This requires specific PCB footprint design and cannot use generic inductor footprints. Verify PCB layout compatibility before substitution.