Equivalent & Substitute Parts for 74451122

Part Overview

The Würth Elektronik 74451122 is a 22 µH shielded drum core wirewound inductor rated for 700 mA with a maximum DC resistance of 110 mOhm. This surface mount component operates across -40°C to 125°C and is classified as Active product status with ROHS3 compliance. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained within the allowed parameter tolerances for this inductor category.

Key Parameters

Parameter	Value	Unit
Inductance	22	µH
Inductance Tolerance	±20%	—
Current Rating	700	mA
DC Resistance (Max)	110	mOhm
Shielding	Shielded	—
Type	Drum Core, Wirewound	—
Mounting Type	Surface Mount	—
Package	Nonstandard	—
Operating Temperature Range	-40°C to 125°C	—
Inductance Test Frequency	100	kHz

Substitute Part Grouping Explanation

Substitute parts for the 74451122 are qualified based on the following electrical and mechanical parameters:

Inductance Value: 22 µH (±20% tolerance)
Current Rating: 700 mA minimum
DC Resistance: 110 mOhm maximum
Shielding: Shielded construction required
Type: Drum core wirewound inductor
Mounting: Surface mount configuration
Package Dimensions: 0.260" L × 0.175" W (6.60mm × 4.45mm) footprint with height ≤ 0.118" (3.00mm)
Inductance Test Frequency: 100 kHz
Compliance: ROHS3 compliant, REACH unaffected

The two identified substitutes—SDS680R-223M (API Delevan Inc.) and SRR6603-220ML (Bourns Inc.)—meet all core electrical requirements and mechanical compatibility criteria for direct replacement in applications requiring this inductor specification.

Parameter Comparison

Parameter	74451122 (Würth Elektronik)	SDS680R-223M (API Delevan)	SRR6603-220ML (Bourns)
Inductance	22 µH	22 µH	22 µH
Inductance Tolerance	±20%	±20%	±20%
Current Rating	700 mA	700 mA	700 mA
DC Resistance (Max)	110 mOhm	110 mOhm	110 mOhm
Shielding	Shielded	Shielded	Shielded
Type	Drum Core, Wirewound	Drum Core, Wirewound	Drum Core, Wirewound
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package	Nonstandard	Nonstandard	Nonstandard
Size / Dimension	0.260" L × 0.175" W (6.60mm × 4.45mm)	0.260" L × 0.175" W (6.60mm × 4.45mm)	0.260" L × 0.173" W (6.60mm × 4.40mm)
Height - Seated (Max)	0.115" (2.92mm)	0.115" (2.92mm)	0.118" (3.00mm)
Frequency - Self Resonant	20.5 MHz	25 MHz	25 MHz
Inductance Frequency - Test	100 kHz	100 kHz	100 kHz
Operating Temperature Range	-40°C to 125°C	-40°C to 85°C	-55°C to 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

All three inductors—74451122, SDS680R-223M, and SRR6603-220ML—carry Active product status and meet ROHS3 compliance requirements with REACH unaffected classification. Selection between these parts should be based on application-specific operating temperature requirements and availability.

The SRR6603-220ML (Bourns) supports the widest operating temperature range (-55°C to 125°C) and provides the highest current saturation rating (300 mA), making it suitable for applications requiring extended low-temperature operation or higher transient current handling. The SDS680R-223M (API Delevan) operates to 85°C maximum and is appropriate for standard industrial temperature ranges. The 74451122 (Würth Elektronik) operates to 125°C and serves applications requiring elevated temperature performance within standard industrial limits.

All three parts maintain identical electrical core specifications: 22 µH inductance at ±20% tolerance, 700 mA current rating, and 110 mOhm maximum DC resistance. Mechanical footprints are compatible within PCB layout tolerances, with maximum height variation of 0.08 mm (3.00 mm vs. 2.92 mm).

Frequently Asked Questions (FAQ)

Q: Can SDS680R-223M replace 74451122 in all applications?

A: SDS680R-223M meets all core electrical specifications and mechanical compatibility requirements. However, its maximum operating temperature is 85°C, compared to 125°C for the 74451122. Applications operating above 85°C require the original part or the SRR6603-220ML substitute.

Q: What is the maximum height difference between these inductors?

A: The maximum seated height varies from 2.92 mm (74451122 and SDS680R-223M) to 3.00 mm (SRR6603-220ML). This 0.08 mm difference is within typical PCB assembly tolerances for surface mount components.

Q: Are all three parts available in Tape & Reel packaging?

A: Yes. The 74451122, SDS680R-223M, and SRR6603-220ML are all supplied in Tape & Reel (TR) packaging suitable for automated assembly processes.

Q: Do these inductors have identical DC resistance?

A: Yes. All three parts specify 110 mOhm maximum DC resistance, ensuring equivalent power dissipation characteristics in circuit applications.

Q: Which substitute offers the best low-temperature performance?

A: The SRR6603-220ML (Bourns) operates to -55°C, providing the lowest minimum operating temperature. The 74451122 and SDS680R-223M are rated to -40°C minimum.

Q: Are moisture sensitivity levels equivalent across all three parts?

A: Yes. All three inductors carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity restrictions for storage or handling.

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