SC1608C-220 Equivalent & Substitute Parts

Part Overview

The SC1608C-220 is a 22 µH shielded inductor manufactured by Signal Transformer, rated for 1.44 A continuous current with a maximum DC resistance of 138 mOhm. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The part operates across the industrial temperature range of -40°C to 125°C and meets ROHS3 compliance requirements.

Key Parameters

Parameter	Value
Inductance	22 µH
Inductance Tolerance	±30%
Current Rating	1.44 A
DC Resistance (DCR)	138 mOhm Max
Saturation Current (Isat)	300 mA
Shielding	Shielded
Mounting Type	Surface Mount
Package Dimensions	6.60mm L x 4.45mm W x 2.92mm H
Operating Temperature	-40°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SC1608C-220 is evaluated based on the following critical parameters:

Inductance Value: Must be 22 µH to maintain circuit functionality
Current Rating: Substitute must support minimum 1.44 A continuous current
DC Resistance: Lower DCR values are acceptable; higher values may impact efficiency
Package Dimensions: Physical footprint must match 6.60mm x 4.45mm x 2.92mm for PCB compatibility
Mounting Type: Surface mount requirement must be maintained
Operating Temperature Range: Must support -40°C to 125°C minimum
Compliance: ROHS3 compliance required for regulatory alignment

The Würth Elektronik 74455122 qualifies as a substitute despite differences in shielding configuration and core material, as it maintains the critical electrical parameters within acceptable engineering tolerances for this application category.

Parameter Comparison

Parameter	SC1608C-220 (Main)	74455122 (Substitute)	Compatibility Notes
Inductance	22 µH	22 µH	Matched
Inductance Tolerance	±30%	±20%	Substitute offers tighter tolerance
Current Rating	1.44 A	800 mA	Substitute rated lower; application-dependent
DC Resistance (DCR)	138 mOhm Max	370 mOhm Max	Substitute exhibits higher resistance
Saturation Current (Isat)	300 mA	700 mA	Substitute offers higher saturation margin
Shielding	Shielded	Unshielded	Different EMI characteristics
Core Type	Not specified	Ferrite Drum Core, Wirewound	Different construction
Package Dimensions	6.60mm x 4.45mm x 2.92mm	6.60mm x 4.45mm x 2.92mm	Matched
Mounting Type	Surface Mount	Surface Mount	Matched
Operating Temperature	-40°C to 125°C	-40°C to 100°C	Substitute has narrower upper range
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Matched
Product Status	Obsolete	Active	Substitute actively manufactured

Engineering Selection Recommendations

The 74455122 from Würth Elektronik serves as an active production alternative to the obsolete SC1608C-220. Both components maintain ROHS3 compliance and identical physical footprints, supporting direct PCB layout compatibility.

Key considerations for selection:

Current Capacity: The SC1608C-220 supports 1.44 A continuous current, while the 74455122 is rated for 800 mA. Applications requiring the full 1.44 A rating must verify that the substitute's lower current capacity is acceptable for the specific circuit design.
DC Resistance Impact: The 74455122 exhibits 370 mOhm maximum DCR compared to 138 mOhm for the original part. This 2.68× increase in resistance will result in proportionally higher power dissipation in current-carrying applications.
Temperature Range: The substitute operates to 100°C maximum, compared to 125°C for the original. Applications requiring operation at temperatures above 100°C require alternative sourcing.
Shielding Configuration: The original part is shielded while the substitute is unshielded. EMI-sensitive circuit designs may require evaluation of the unshielded configuration's impact on system performance.
Active Availability: The 74455122 is in active production with confirmed inventory, providing long-term procurement stability compared to the obsolete SC1608C-220.

Frequently Asked Questions (FAQ)

Q: Can the 74455122 directly replace the SC1608C-220 in all applications?

A: Direct replacement depends on application-specific requirements. The substitute maintains the same inductance value and physical footprint but differs in current rating (800 mA vs. 1.44 A), DC resistance (370 mOhm vs. 138 mOhm), temperature range (-40°C to 100°C vs. -40°C to 125°C), and shielding configuration. Applications operating below 800 mA, at temperatures below 100°C, and tolerant of higher DCR and unshielded operation are compatible.

Q: What is the impact of the higher DC resistance in the 74455122?

A: Higher DC resistance increases resistive power loss according to P = I²R. At 800 mA, the 74455122 dissipates approximately 237 mW compared to 89 mW for the SC1608C-220. Thermal management and efficiency requirements must be evaluated for the specific application.

Q: Why does the substitute have lower current rating despite higher saturation current?

A: Saturation current (Isat) and continuous current rating (Ic) are distinct parameters. Saturation current indicates the threshold at which inductance begins to degrade, while continuous current rating reflects the maximum sustained current the component can handle without exceeding thermal limits. The 74455122's lower continuous rating reflects its thermal design constraints despite higher saturation performance.

Q: Is the unshielded configuration of the 74455122 suitable for my application?

A: Shielding reduces electromagnetic interference emission and susceptibility. Applications in noise-sensitive environments, high-frequency circuits, or systems with strict EMI compliance requirements should evaluate whether unshielded operation is acceptable. Shielded alternatives may be necessary for such applications.

Q: Are both parts RoHS compliant?

A: Yes, both the SC1608C-220 and 74455122 are ROHS3 compliant, meeting current regulatory requirements for hazardous substance restrictions.

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