SC312MF-180 Equivalent & Substitute Parts

Part Overview

The SC312MF-180 is a 18 µH shielded wirewound inductor manufactured by Signal Transformer, rated for 440 mA continuous current with a maximum DC resistance of 1.16Ohm. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The part operates across an industrial temperature range of -40°C to 125°C and meets ROHS3 compliance requirements.

Substiute Parts

SC312MF-180

Signal TransformerIn Stock: 1060SC312MF-180 Datasheet

Current PartRFQ

CDRH3D11HPNP-180NC

Sumida America Components Inc.In Stock: 934CDRH3D11HPNP-180NC Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The CDRH3D11HPNP-180NC from Sumida America Components Inc. qualifies as a functional substitute based on the following alignment of critical parameters:

Matching Parameters:

• Inductance value: 18 µH (identical)
• Inductance test frequency: 100 kHz (identical)
• Shielding classification: Shielded (identical)
• Mounting type: Surface Mount (identical)
• Package footprint: 0.150" L x 0.150" W / 3.80mm x 3.80mm (identical)
• RoHS3 compliance: Yes (identical)
• MSL rating: 1 (Unlimited) (identical)

Allowable Parameter Variations:

• Current rating: 400 mA (substitute) vs. 440 mA (main part) — within acceptable tolerance for applications not requiring maximum current capacity
• DC resistance: 888 mOhm (substitute) vs. 1.16 Ohm (main part) — lower resistance provides improved performance characteristics
• Saturation current: 520 mA (substitute) vs. 680 mA (main part) — lower saturation point requires verification for high-current transient conditions
• Inductance tolerance: ±25% (substitute) vs. ±20% (main part) — wider tolerance acceptable for general applications
• Operating temperature: -40°C ~ 105°C (substitute) vs. -40°C ~ 125°C (main part) — reduced upper temperature limit requires thermal environment verification
• Product status: Active (substitute) vs. Obsolete (main part) — substitute offers ongoing availability

Parameter Comparison

Engineering Selection Recommendations

The CDRH3D11HPNP-180NC is suitable as a substitute for the SC312MF-180 in applications where the following conditions are met:

• Operating current does not exceed 400 mA continuous
• Operating temperature does not exceed 105°C
• Circuit design tolerates inductance tolerance of ±25%
• Lower DC resistance (888 mOhm vs. 1.16 Ohm) is acceptable or beneficial
• PCB layout accommodates the reduced seated height of 0.047" (1.20mm) versus 0.053" (1.35mm)

Both components maintain identical footprint dimensions (3.80mm x 3.80mm), identical shielding classification, and identical RoHS3 compliance status. The substitute part is currently in active production status, ensuring long-term procurement availability compared to the obsolete SC312MF-180.

Frequently Asked Questions (FAQ)

Q: Can the CDRH3D11HPNP-180NC replace the SC312MF-180 in all applications?

A: No. The substitute part has a lower continuous current rating (400 mA vs. 440 mA) and lower saturation current (520 mA vs. 680 mA). Applications requiring currents above 400 mA or experiencing high-current transient conditions must be evaluated individually.

Q: What is the impact of the different DC resistance values?

A: The CDRH3D11HPNP-180NC has lower DC resistance (888 mOhm vs. 1.16 Ohm). This reduces resistive losses and heat generation, which is generally beneficial. However, circuits designed with specific impedance or damping characteristics may require recalculation.

Q: Are the package dimensions compatible?

A: Yes. Both parts share identical footprint dimensions of 0.150" L x 0.150" W (3.80mm x 3.80mm). The substitute has a slightly lower seated height (0.047" vs. 0.053"), which is compatible with standard PCB assembly processes.

Q: What is the significance of the wider inductance tolerance on the substitute?

A: The CDRH3D11HPNP-180NC has ±25% tolerance versus ±20% for the SC312MF-180. Applications with tight inductance specifications or frequency-dependent performance may require circuit tuning or tolerance stack analysis.

Q: Does the reduced operating temperature range affect compatibility?

A: The substitute operates to 105°C maximum versus 125°C for the main part. Applications operating above 105°C require the original SC312MF-180 or alternative parts with higher temperature ratings.

Q: Are both parts RoHS compliant?

A: Yes. Both the SC312MF-180 and CDRH3D11HPNP-180NC are ROHS3 compliant with MSL rating 1 (Unlimited), meeting current environmental and reliability standards.