SC3DF-180 Equivalent & Substitute Parts

Part Overview

The SC3DF-180 is a 18 µH unshielded wirewound inductor manufactured by Signal Transformer, rated for 880 mA continuous current with a maximum DC resistance of 450mOhm. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The part operates across the industrial temperature range of -40°C to 125°C and is ROHS3 compliant.

Substiute Parts

SC3DF-180

Signal TransformerIn Stock: 1018SC3DF-180 Datasheet

Current PartRFQ

SDR0703-180KL

Bourns Inc.In Stock: 684SDR0703-180KL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC3DF-180 is based on the following critical parameters:

• Inductance Value: 18 µH (primary electrical requirement)
• Current Rating: Minimum 880 mA to maintain circuit performance
• DC Resistance: Maximum 450 mOhm to ensure acceptable power dissipation
• Mounting Type: Surface Mount (SMD) for PCB compatibility
• Operating Temperature Range: -40°C to 125°C
• Shielding Configuration: Unshielded
• Compliance Standards: ROHS3 and REACH requirements

The SDR0703-180KL from Bourns Inc. meets these substitution criteria with compatible electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The SDR0703-180KL is an active product from Bourns Inc. and serves as a direct substitute for the obsolete SC3DF-180. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility in current manufacturing environments.

The substitute part offers improved specifications in several areas: tighter inductance tolerance (±10% versus ±20%), lower DC resistance (280 mOhm versus 450 mOhm), and a lower seated height (2.70mm versus 3.10mm). The SDR0703-180KL's continuous current rating of 700 mA is lower than the original 880 mA specification; circuit designs must verify that this reduced rating is acceptable for the intended application. The substitute's higher saturation current (1.05 A versus 510 mA) provides improved headroom against saturation effects.

Both components are unshielded surface mount inductors with identical operating temperature ranges and moisture sensitivity classifications, ensuring functional equivalence in standard PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the SDR0703-180KL directly replace the SC3DF-180 in all applications?

A: The SDR0703-180KL is electrically and mechanically compatible for most applications. However, the reduced continuous current rating (700 mA versus 880 mA) must be verified against circuit requirements. If the design operates the inductor above 700 mA continuous current, the substitute is not suitable.

Q: What is the impact of the lower DC resistance in the substitute part?

A: The SDR0703-180KL's lower DC resistance (280 mOhm versus 450 mOhm) reduces power dissipation and heat generation. This is a beneficial characteristic that improves thermal performance without affecting circuit functionality.

Q: Are there packaging differences between these parts?

A: The SC3DF-180 uses nonstandard packaging, while the SDR0703-180KL is supplied in Tape & Reel (TR) format. Both are surface mount components with compatible footprints. The SDR0703-180KL has a slightly lower seated height (2.70mm versus 3.10mm), which may provide additional PCB clearance in space-constrained designs.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both the SC3DF-180 and SDR0703-180KL are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic component manufacturing and assembly.

Q: What is the difference in inductance tolerance between these parts?

A: The SC3DF-180 has ±20% tolerance, while the SDR0703-180KL has ±10% tolerance. The substitute provides tighter tolerance control, which may improve circuit performance consistency in applications sensitive to inductance variation.