SC3DF-220 Equivalent & Substitute Parts

Part Overview

The SC3DF-220 is a 22 µH unshielded wirewound inductor manufactured by Signal Transformer, rated for 860 mA continuous current with a maximum DC resistance of 534 mOhm. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The part operates across the industrial temperature range of -40°C to 125°C and is mounted as a surface mount device in a nonstandard package configuration.

Substiute Parts

SC3DF-220

Signal TransformerIn Stock: 799SC3DF-220 Datasheet

Current PartRFQ

UP0.4C-220-R

Eaton - Electronics DivisionIn Stock: 931UP0.4C-220-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC3DF-220 is based on the following critical parameters:

• Inductance Value: 22 µH with ±20% tolerance
• Current Rating: Minimum 860 mA continuous current capability
• DC Resistance: Maximum 534 mOhm to maintain circuit performance
• Mounting Type: Surface mount configuration
• Shielding Configuration: Unshielded topology
• Temperature Range: Operating capability within -40°C to 125°C
• Package Compatibility: Nonstandard package with physical dimensions 0.256" L × 0.173" W × 0.122" H (6.50mm × 4.40mm × 3.10mm)

The substitute part UP0.4C-220-R from Eaton - Electronics Division meets the core electrical requirements for inductance, current rating, and DC resistance specifications. Both parts maintain unshielded wirewound construction and surface mount deployment, with compatible physical footprints within manufacturing tolerances.

Parameter Comparison

Engineering Selection Recommendations

The UP0.4C-220-R substitute part is suitable for applications where the SC3DF-220 is no longer available. Key considerations for selection:

Compliance and Availability: The UP0.4C-220-R maintains active product status with current manufacturing support, ensuring long-term procurement viability. Both parts are RoHS compliant and carry MSL 1 moisture sensitivity ratings.

Electrical Performance: The substitute part delivers equivalent inductance at 22 µH with matching ±20% tolerance. The UP0.4C-220-R exhibits lower DC resistance (360 mOhm vs. 534 mOhm), which reduces resistive losses in the circuit. The continuous current rating of 760 mA is lower than the original 860 mA specification; applications requiring the full 860 mA rating must be re-evaluated.

Temperature Derating: The substitute part operates to 85°C maximum, compared to the original 125°C upper limit. Designs operating in the 85°C to 125°C range require thermal analysis to confirm suitability.

Physical Compatibility: Dimensional differences are minimal (0.004" length and width variance, 0.007" height reduction), with compatibility confirmed for standard surface mount assembly processes.

Frequently Asked Questions (FAQ)

Q: Can UP0.4C-220-R directly replace SC3DF-220 in all applications?

A: Direct substitution is valid for applications operating at continuous currents up to 760 mA and ambient temperatures not exceeding 85°C. Applications requiring the full 860 mA rating or operating above 85°C require circuit re-evaluation.

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

A: Lower DC resistance (360 mOhm vs. 534 mOhm) reduces I²R losses, resulting in lower heat generation and improved efficiency. This is a beneficial characteristic for most applications.

Q: Are the physical dimensions compatible with existing PCB layouts?

A: Yes. The dimensional variance of 0.004" in length and width, and 0.007" in height, falls within standard surface mount assembly tolerances and is compatible with existing footprints designed for the SC3DF-220.

Q: What is the difference between the core materials?

A: The SC3DF-220 uses a standard wirewound core, while the UP0.4C-220-R employs a ferrite drum core wirewound construction. Both maintain unshielded topology and deliver equivalent inductance performance at the specified test frequency of 100 kHz.

Q: Are both parts available in the same packaging format?

A: The SC3DF-220 is supplied in nonstandard packaging. The UP0.4C-220-R is available in Tape & Reel (TR) format, which is standard for high-volume surface mount assembly operations.

Q: What compliance certifications apply to both parts?

A: Both parts are RoHS compliant and carry ECCN EAR99 classification. The SC3DF-220 is ROHS3 compliant, while the UP0.4C-220-R is RoHS compliant. Both are REACH unaffected or unaffected by REACH regulations.