SC3DF-820 Equivalent & Substitute Parts

Part Overview

The SC3DF-820 is a 82 µH unshielded wirewound inductor manufactured by Signal Transformer, rated for 430 mA continuous current with a maximum DC resistance of 2.31Ohm. 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 ROHS3 compliant.

Substiute Parts

SC3DF-820

Signal TransformerIn Stock: 866SC3DF-820 Datasheet

Current PartRFQ

SDR0703-820KL

Bourns Inc.In Stock: 958SDR0703-820KL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC3DF-820 is based on the following critical parameters:

• Inductance Value: 82 µH (primary electrical requirement)
• Current Rating: Minimum 330 mA acceptable; SC3DF-820 rated at 430 mA
• DC Resistance: Lower DCR values improve efficiency; SC3DF-820 specifies 2.31Ohm maximum
• Shielding Configuration: Unshielded topology must be maintained
• Mounting Type: Surface mount package required
• Operating Temperature Range: -40°C to 125°C minimum
• Compliance: ROHS3 and REACH requirements

The SDR0703-820KL from Bourns Inc. meets these substitution criteria with equivalent inductance, compatible current handling, and identical operating temperature specifications.

Parameter Comparison

Engineering Selection Recommendations

The SDR0703-820KL is an active product from Bourns Inc. and serves as the primary substitute for the obsolete SC3DF-820. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity.

The SDR0703-820KL offers improved electrical performance with lower DC resistance (1.18Ohm vs. 2.31Ohm) and tighter inductance tolerance (±10% vs. ±20%). However, the current rating is reduced from 430 mA to 330 mA. Circuit designs operating at or below 330 mA continuous current will experience no functional limitation. Designs requiring the full 430 mA rating must evaluate alternative inductors with higher current specifications.

The SDR0703-820KL features a ferrite drum core construction compared to the SC3DF-820 wirewound design, resulting in improved saturation current performance (470 mA vs. 220 mA) and measurable Q factor characteristics at 2.52MHz.

Frequently Asked Questions (FAQ)

Q: Can the SDR0703-820KL directly replace the SC3DF-820 in all applications?

A: Direct replacement is valid for circuits operating at 330 mA or below. If your design requires the full 430 mA rating of the original part, alternative inductors with higher current specifications must be evaluated.

Q: What is the impact of the lower DC resistance in the SDR0703-820KL?

A: Lower DC resistance (1.18Ohm vs. 2.31Ohm) reduces power dissipation and heat generation, improving overall circuit efficiency. This is a beneficial characteristic for most applications.

Q: Why does the SDR0703-820KL have a tighter tolerance?

A: The ±10% tolerance of the SDR0703-820KL provides better inductance accuracy compared to the ±20% tolerance of the SC3DF-820. This allows for more precise circuit tuning and performance predictability.

Q: Are there physical dimension differences between these parts?

A: Both parts are surface mount with similar footprints. The SC3DF-820 measures 0.256" L x 0.173" W x 0.122" H (6.50mm x 4.40mm x 3.10mm). The SDR0703-820KL measures 0.256" L x 0.177" W x 0.106" H (6.50mm x 4.50mm x 2.70mm). The SDR0703-820KL is slightly lower in profile.

Q: What packaging options are available for the SDR0703-820KL?

A: The SDR0703-820KL is supplied in Tape & Reel (TR) packaging for automated assembly processes.

Q: Are both parts compliant with current environmental regulations?

A: Yes. Both the SC3DF-820 and SDR0703-820KL are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.