SC1608C-331 Equivalent & Substitute Parts

Part Overview

The SC1608C-331 is a 330 µH shielded surface mount inductor manufactured by Signal Transformer, rated for 400 mA with a maximum DC resistance of 1.83Ohm. This component is classified as obsolete, making 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 meets ROHS3 compliance standards.

Key Parameters

Parameter	SC1608C-331
Inductance	330 µH
Current Rating	400 mA
DC Resistance (DCR)	1.83Ohm Max
Shielding	Shielded
Mounting Type	Surface Mount
Package Size	0.260" L x 0.175" W (6.60mm x 4.45mm)
Height - Seated (Max)	0.115" (2.92mm)
Operating Temperature	-40°C ~ 125°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the SC1608C-331 is determined by the following critical parameters:

Inductance Value: 330 µH nominal (±30% tolerance allows 231–429 µH range)
Current Rating: Minimum 400 mA to support the original design current
DC Resistance: Maximum 1.83Ohm to maintain circuit performance
Shielding: Shielded construction to prevent electromagnetic interference
Mounting Type: Surface mount configuration
Package Footprint: Physical dimensions must accommodate 6.60mm x 4.45mm placement
Operating Temperature: -40°C to 125°C range
Compliance: ROHS3 compliance required

Two substitute parts meet these criteria with acceptable parameter variations within engineering tolerances.

Parameter Comparison

Parameter	SC1608C-331	SC1608F-331	SD7030-331-R
Manufacturer	Signal Transformer	Signal Transformer	Eaton - Electronics Division
Inductance	330 µH	330 µH	317 µH
Inductance Tolerance	±30%	±20%	±30%
Current Rating (Amps)	400 mA	200 mA	380 mA
Current - Saturation (Isat)	70 mA	180 mA	300 mA
DC Resistance (DCR)	1.83Ohm Max	5.8Ohm Max	1.725Ohm Max
Shielding	Shielded	Unshielded	Shielded
Type	-	Wirewound	Drum Core, Wirewound
Material - Core	-	-	Ferrite
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package Size	0.260" L x 0.175" W (6.60mm x 4.45mm)	0.260" L x 0.175" W (6.60mm x 4.45mm)	0.276" L x 0.276" W (7.00mm x 7.00mm)
Height - Seated (Max)	0.115" (2.92mm)	0.115" (2.92mm)	0.118" (3.00mm)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Packaging	-	-	Tape & Reel (TR)

Engineering Selection Recommendations

SC1608F-331 (Signal Transformer)

This substitute maintains identical inductance (330 µH) and footprint dimensions (6.60mm x 4.45mm) with improved tolerance (±20% vs ±30%). However, the current rating is reduced to 200 mA, and DC resistance increases to 5.8Ohm Max. The unshielded construction differs from the original shielded design. This part is suitable only for applications where the 200 mA current limit is acceptable and electromagnetic shielding is not required. Product status is active with ROHS3 compliance.

SD7030-331-R (Eaton - Electronics Division)

This substitute provides the closest electrical performance match with shielded construction, ferrite drum core design, and DC resistance of 1.725Ohm Max (lower than the original 1.83Ohm). Inductance is 317 µH (within the ±30% tolerance band of the original 330 µH specification). Current rating is 380 mA, which approaches the original 400 mA specification. Package footprint is slightly larger (7.00mm x 7.00mm vs 6.60mm x 4.45mm), requiring PCB layout verification. Product status is active with RoHS compliance. Supplied in Tape & Reel packaging.

Frequently Asked Questions (FAQ)

Q: Can SC1608F-331 replace SC1608C-331 in all applications?

A: No. SC1608F-331 has a reduced current rating of 200 mA compared to the original 400 mA specification. Use this substitute only in circuits where the lower current rating is acceptable. Additionally, the unshielded construction may introduce electromagnetic interference in sensitive applications.

Q: What are the inductance tolerance implications for substitution?

A: SC1608C-331 has ±30% tolerance (231–429 µH range). SD7030-331-R at 317 µH falls within this range. SC1608F-331 maintains 330 µH with tighter ±20% tolerance. Both are electrically compatible from an inductance perspective.

Q: Does the SD7030-331-R footprint change affect PCB compatibility?

A: Yes. SD7030-331-R measures 7.00mm x 7.00mm versus the original 6.60mm x 4.45mm. PCB layout must be verified to confirm adequate clearance and trace routing compatibility before implementation.

Q: Which substitute has the best DC resistance match?

A: SD7030-331-R has 1.725Ohm Max DCR, which is lower than the original 1.83Ohm Max. SC1608F-331 has significantly higher DCR at 5.8Ohm Max, which may affect circuit performance in current-sensitive applications.

Q: Are both substitutes RoHS compliant?

A: Yes. SC1608F-331 is ROHS3 compliant. SD7030-331-R is RoHS compliant. Both meet environmental compliance requirements.

Q: What is the saturation current difference, and does it matter?

A: SC1608C-331 has Isat of 70 mA. SD7030-331-R has Isat of 300 mA, providing greater saturation margin. SC1608F-331 has Isat of 180 mA. Higher saturation current provides better performance stability under transient conditions.

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