SC1608C-681 Equivalent & Substitute Parts

Part Overview

The SC1608C-681 is a 680 µH shielded inductor manufactured by Signal Transformer, rated for 280 mA maximum current with 3.6Ohm DC resistance. This component is classified as obsolete, making equivalent substitutes necessary for new designs and production 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 measuring 6.60mm × 4.45mm.

Substiute Parts

SC1608C-681

Signal TransformerIn Stock: 1089SC1608C-681 Datasheet

Current PartRFQ

IDCS2512ER681M

Vishay DaleIn Stock: 782IDCS2512ER681M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SC1608C-681 is determined by strict alignment of electrical and mechanical parameters. The primary substitute IDCS2512ER681M from Vishay Dale maintains the core functional requirements: identical 680 µH inductance value, matching physical dimensions (6.60mm × 4.45mm × 2.92mm), identical operating temperature range (-40°C to 125°C), and equivalent shielding classification.

The substitution is valid based on the following criteria:

• Inductance value: 680 µH (exact match)
• Inductance tolerance: ±20% (tighter than original ±30%)
• Physical footprint: 6.60mm × 4.45mm (exact match)
• Shielding: Shielded (exact match)
• Operating temperature: -40°C ~ 125°C (exact match)
• Mounting: Surface Mount (exact match)
• Test frequency: 100 kHz (exact match)
• Compliance: ROHS3 Compliant (exact match)

The IDCS2512ER681M exhibits lower DC resistance (2.2Ohm vs. 3.6Ohm) and reduced current rating (180 mA vs. 280 mA), which represents a more conservative electrical profile suitable for applications where the original part's specifications exceed circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

The IDCS2512ER681M is the qualified substitute for the SC1608C-681 based on electrical and mechanical parameter alignment. The substitute part carries active product status from Vishay Dale, ensuring ongoing availability and supply chain continuity. Both components maintain ROHS3 compliance and identical operating temperature specifications, supporting direct replacement in existing designs.

The substitute's lower DC resistance (2.2Ohm vs. 3.6Ohm) and reduced current rating (180 mA vs. 280 mA) must be evaluated against circuit requirements. Applications operating at or below 180 mA with inductance-dependent functionality will experience improved performance due to lower resistive losses. Circuits requiring the full 280 mA rating of the original part require verification that the substitute's 180 mA maximum does not exceed application current demands.

Frequently Asked Questions (FAQ)

Q: Can the IDCS2512ER681M directly replace the SC1608C-681 in existing PCB layouts?

A: Yes. Both components share identical physical dimensions (6.60mm × 4.45mm × 2.92mm) and surface mount footprints, enabling direct PCB placement without layout modification.

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

A: The IDCS2512ER681M exhibits 2.2Ohm DC resistance compared to the original 3.6Ohm specification. This lower resistance reduces power dissipation in the inductor, resulting in lower heat generation and improved efficiency in the circuit. This is a beneficial characteristic for most applications.

Q: Does the reduced current rating of the substitute affect compatibility?

A: The IDCS2512ER681M is rated for 180 mA maximum current versus the original 280 mA rating. Substitution is valid only for applications where circuit current does not exceed 180 mA. Verify actual circuit current requirements before selection.

Q: Are both parts compliant with environmental and regulatory standards?

A: Yes. Both the SC1608C-681 and IDCS2512ER681M are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99, meeting equivalent regulatory requirements.

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

A: The SC1608C-681 specifies ±30% tolerance, while the IDCS2512ER681M specifies ±20% tolerance. The substitute provides tighter tolerance control, which may improve circuit performance in applications sensitive to inductance variation.

Q: Is the substitute part available in the same packaging format?

A: The IDCS2512ER681M is supplied in Tape & Reel (TR) packaging, while the original SC1608C-681 packaging format is not specified. Verify packaging compatibility with assembly equipment and procurement requirements.