SC312MF-270 Equivalent & Substitute Parts

Part Overview

The SC312MF-270 is a 27 µH shielded wirewound inductor manufactured by Signal Transformer, rated for 380 mA continuous current with a maximum DC resistance of 1.65Ohm. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The part operates across the industrial temperature range of -40°C to 125°C and is ROHS3 compliant.

Substiute Parts

SC312MF-270

Signal TransformerIn Stock: 872SC312MF-270 Datasheet

Current PartRFQ

ASPI-4020S-270M-T

Abracon LLCIn Stock: 720ASPI-4020S-270M-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The ASPI-4020S-270M-T from Abracon LLC qualifies as a functional substitute based on the following critical parameters:

• Inductance Match: Both parts specify 27 µH at 100 kHz with ±20% tolerance
• Shielding Configuration: Both employ shielded construction
• Temperature Range Alignment: Both operate across -40°C to 125°C
• Surface Mount Compatibility: Both are surface mount devices
• Compliance Equivalence: Both are ROHS3 compliant with MSL 1 rating

The substitute part demonstrates superior electrical performance in current handling (500 mA vs. 380 mA) and lower DC resistance (545 mOhm vs. 1.65 Ohm), with an active product status ensuring ongoing availability.

Parameter Comparison

Engineering Selection Recommendations

The ASPI-4020S-270M-T is the qualified substitute for the obsolete SC312MF-270. Selection is based on:

• Functional Equivalence: Identical inductance value and tolerance at the specified test frequency
• Compliance Continuity: Both parts maintain ROHS3 compliance and identical MSL ratings
• Availability: The substitute maintains active product status, ensuring long-term procurement viability
• Performance Enhancement: The substitute provides improved electrical characteristics with higher current ratings and lower DC resistance, making it suitable for applications where the original part was marginal

Physical dimensions differ slightly (4.00mm x 4.00mm vs. 3.80mm x 3.80mm footprint; 2.00mm vs. 1.35mm height), requiring PCB layout verification prior to implementation.

Frequently Asked Questions (FAQ)

Q: Can ASPI-4020S-270M-T directly replace SC312MF-270 in existing designs?

A: The substitute provides electrical equivalence at the specified inductance and frequency. Physical footprint differences require PCB layout assessment. The improved current rating and lower DC resistance make it suitable for the same application class.

Q: What are the key differences between these parts?

A: The primary differences are product status (obsolete vs. active), DC resistance (1.65 Ohm vs. 545 mOhm), current rating (380 mA vs. 500 mA), and physical dimensions. Inductance value, tolerance, temperature range, and compliance specifications are identical.

Q: Are there packaging differences?

A: The SC312MF-270 uses standard tape and reel packaging, while the ASPI-4020S-270M-T is supplied in tape and reel format. Both are surface mount compatible with MSL 1 ratings.

Q: How do the core materials differ?

A: The SC312MF-270 uses wirewound construction, while the ASPI-4020S-270M-T employs drum core wirewound construction with ferrite material. Both achieve the same inductance specification at 100 kHz.

Q: Is thermal performance equivalent?

A: Both parts operate across -40°C to 125°C. The substitute's lower DC resistance (545 mOhm vs. 1.65 Ohm) results in reduced power dissipation at rated current, providing improved thermal performance.