SC3DF-470 Equivalent & Substitute Parts

Part Overview

The SC3DF-470 is a 47 µH unshielded wirewound inductor manufactured by Signal Transformer, rated for 560 mA continuous current with a maximum DC resistance of 1.36 Ohm. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across the industrial temperature range of -40°C to 125°C and is fully RoHS3 compliant.

Substiute Parts

SC3DF-470

Signal TransformerIn Stock: 949SC3DF-470 Datasheet

Current PartRFQ

UP0.4C-470-R

Eaton - Electronics DivisionIn Stock: 4777UP0.4C-470-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The UP0.4C-470-R qualifies as a direct substitute for the SC3DF-470 based on the following critical parameters:

Matching Parameters:

• Inductance value: 47 µH at 100 kHz test frequency
• Inductance tolerance: ±20%
• Unshielded construction
• Surface mount configuration
• Nonstandard package classification
• MSL Rating 1 (Unlimited)
• RoHS compliance (RoHS3 vs RoHS Compliant)

Allowable Variations:

• Current rating: 530 mA (substitute) vs 560 mA (original) — within acceptable margin for most applications
• Saturation current: 530 mA (substitute) vs 290 mA (original) — substitute provides improved saturation performance
• DC resistance: 820 mOhm (substitute) vs 1.36 Ohm (original) — substitute offers lower resistance, beneficial for efficiency
• Operating temperature: -40°C to 85°C (substitute) vs -40°C to 125°C (original) — substitute covers standard industrial range
• Physical dimensions: 6.60mm x 4.45mm x 2.92mm (substitute) vs 6.50mm x 4.40mm x 3.10mm (original) — negligible variation within PCB layout tolerance

Parameter Comparison

Engineering Selection Recommendations

The UP0.4C-470-R is the recommended substitute for the obsolete SC3DF-470. Selection is justified on the following engineering criteria:

Product Status: The original SC3DF-470 is obsolete, while the UP0.4C-470-R is active and in production, ensuring long-term availability and supply chain continuity.

Compliance & Certifications: Both parts meet RoHS requirements (RoHS3 and RoHS Compliant respectively) and carry identical ECCN classification (EAR99), confirming regulatory equivalence for export and procurement purposes.

Electrical Performance: The substitute delivers superior electrical characteristics with lower DC resistance (820 mOhm vs 1.36 Ohm) and higher saturation current (530 mA vs 290 mA), resulting in improved efficiency and thermal performance in typical applications.

Current Rating Consideration: The substitute's 530 mA rating is 5.4% lower than the original 560 mA specification. This margin is acceptable for applications operating below 530 mA continuous current. For designs requiring the full 560 mA capability, thermal analysis and derating curves must be consulted.

Temperature Range: The substitute operates to 85°C maximum, compared to the original 125°C. Applications limited to standard industrial temperature ranges (-40°C to 85°C) are fully compatible. High-temperature applications exceeding 85°C require alternative evaluation.

Physical Compatibility: Dimensional variations (6.60mm x 4.45mm x 2.92mm vs 6.50mm x 4.40mm x 3.10mm) are within standard PCB layout tolerances and do not require design modification.

Frequently Asked Questions (FAQ)

Q: Can the UP0.4C-470-R directly replace the SC3DF-470 in existing designs?

A: Yes, for applications operating within 530 mA continuous current and -40°C to 85°C temperature range. The identical inductance value (47 µH ±20%), matching tolerance, unshielded construction, and surface mount configuration ensure functional equivalence. Verify your application's current and temperature requirements against the substitute's ratings.

Q: What is the impact of the lower current rating (530 mA vs 560 mA)?

A: The 30 mA difference represents a 5.4% reduction in continuous current capacity. If your circuit operates below 530 mA, no design change is required. If your design requires the full 560 mA capability, thermal analysis of the substitute under your specific operating conditions is necessary to confirm suitability.

Q: Why is the DC resistance of the substitute lower (820 mOhm vs 1.36 Ohm)?

A: The lower DC resistance of the UP0.4C-470-R results from its ferrite drum core construction and optimized winding design. This characteristic reduces resistive losses and heat generation, improving overall circuit efficiency. In most applications, lower DCR is beneficial.

Q: Does the operating temperature difference affect compatibility?

A: The substitute's maximum operating temperature is 85°C, compared to the original's 125°C. For applications operating within -40°C to 85°C, full compatibility is confirmed. Applications requiring operation above 85°C must use alternative components rated for higher temperatures.

Q: Are there packaging differences between these parts?

A: The substitute is supplied in Tape & Reel (TR) format, which is standard for automated assembly. The original part's packaging format is not specified. Both use nonstandard package classifications. Confirm your assembly process compatibility with Tape & Reel packaging.

Q: What is the significance of the ferrite drum core in the substitute?

A: The ferrite drum core provides improved magnetic performance and lower DC resistance compared to unspecified core materials. This construction is standard in modern surface mount inductors and contributes to the substitute's superior saturation current and efficiency characteristics.

Q: Are both parts RoHS compliant?

A: Yes. The original SC3DF-470 is RoHS3 Compliant, and the substitute UP0.4C-470-R is RoHS Compliant. Both meet environmental and hazardous substance restrictions for procurement and assembly in regulated markets.