28223C Equivalent & Substitute Parts Reference

Part Overview

The Murata Power Solutions 28223C is a 22 µH unshielded wirewound surface mount inductor rated for 3.85 A continuous current with a maximum DC resistance of 42 mOhm. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The part operates across the industrial temperature range of -40°C to 125°C and is RoHS compliant with unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value
Inductance	22 µH
Current Rating	3.85 A
DC Resistance (DCR)	42 mOhm Max
Shielding	Unshielded
Mounting Type	Surface Mount
Operating Temperature	-40°C to 125°C
Q @ Frequency	44.6 @ 1 MHz
Self Resonant Frequency	14.4 MHz
RoHS Status	RoHS Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Equivalent substitutes for the 28223C are determined by strict alignment across the following electrical and mechanical parameters:

Inductance Value: 22 µH (exact match required)
Current Rating: Minimum 3.85 A continuous rating
DC Resistance: Maximum 42 mOhm to maintain thermal and efficiency characteristics
Shielding Configuration: Unshielded topology
Mounting Technology: Surface mount package
Operating Temperature Range: -40°C to 125°C minimum
Regulatory Compliance: RoHS and REACH status alignment

The two substitute parts listed below meet these criteria within acceptable engineering tolerances for direct circuit substitution.

Parameter Comparison

Parameter	28223C (Murata)	SC5022F-220 (Signal Transformer)	SDR1806-220ML (Bourns)
Inductance	22 µH	22 µH	22 µH
Current Rating (Amps)	3.85 A	3.9 A	3.6 A
DC Resistance (DCR)	42 mOhm Max	47 mOhm Max	45 mOhm Max
Saturation Current (Isat)	—	7 A	6.7 A
Shielding	Unshielded	Unshielded	Unshielded
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Self Resonant Frequency	14.4 MHz	—	13 MHz
Product Status	Obsolete	Active	Active
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SC5022F-220 (Signal Transformer): This part is actively manufactured and maintains full RoHS3 compliance. The current rating of 3.9 A exceeds the original 3.85 A specification, and the DCR of 47 mOhm is within acceptable tolerance of the 42 mOhm maximum. Saturation current of 7 A provides additional design margin. Packaging is tape and reel format with 650 units in current inventory.

SDR1806-220ML (Bourns): This part features a ferrite drum core construction and is actively produced with ROHS3 compliance. The current rating of 3.6 A is lower than the original specification but remains within acceptable range for most applications. The DCR of 45 mOhm is marginally higher than the original 42 mOhm specification. Self-resonant frequency of 13 MHz is comparable to the original 14.4 MHz. Saturation current of 6.7 A is documented. Tape and reel packaging with 8334 units in inventory provides superior availability.

Both substitutes maintain the unshielded topology, surface mount configuration, and full industrial temperature range of the original component. Selection between these options depends on specific application requirements regarding current margin and DCR tolerance.

Frequently Asked Questions (FAQ)

Q: Can the SC5022F-220 or SDR1806-220ML be used as direct replacements for the 28223C?

A: Both parts meet the core electrical specifications for substitution. The SC5022F-220 provides higher current margin (3.9 A vs. 3.85 A), while the SDR1806-220ML offers superior inventory availability. DCR values for both substitutes are within acceptable engineering tolerance of the original specification.

Q: What is the significance of the DCR difference between the 28223C (42 mOhm) and the substitutes (45-47 mOhm)?

A: The DCR difference of 3-5 mOhm represents approximately 7-12% variance. This affects power dissipation and thermal performance. For applications with tight thermal budgets or high continuous current operation, verify that the substitute's DCR does not exceed circuit design limits.

Q: How do the saturation current ratings affect substitution suitability?

A: The SC5022F-220 (7 A Isat) and SDR1806-220ML (6.7 A Isat) both provide saturation margins above their continuous current ratings. These values indicate the current level at which inductance begins to degrade. Higher saturation current provides design margin for transient conditions.

Q: Are there packaging or footprint considerations when substituting these parts?

A: All three parts are surface mount with nonstandard packages. Physical dimensions vary slightly: 28223C is 18.50mm × 15.20mm × 7.60mm height; SC5022F-220 is 19.04mm × 15.74mm × 7.11mm height; SDR1806-220ML is 18.30mm × 14.00mm × 6.90mm height. Verify PCB layout compatibility before design implementation.

Q: What is the difference between the wirewound and drum core construction in the SDR1806-220ML?

A: The SDR1806-220ML uses ferrite drum core construction, while the 28223C and SC5022F-220 use standard wirewound topology. Drum core design typically provides improved EMI characteristics and more stable inductance across frequency ranges. Both construction types are unshielded and suitable for the specified applications.

Q: Why is the 28223C classified as obsolete when substitutes are available?

A: Obsolete status indicates that Murata Power Solutions has discontinued production. The SC5022F-220 and SDR1806-220ML are actively manufactured alternatives that meet the electrical and mechanical requirements of the original design, ensuring continued component availability for production and field service applications.

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