PM74SH-221M-RC Equivalent & Substitute Parts

Part Overview

The PM74SH-221M-RC is a 220 µH shielded drum core wirewound inductor manufactured by Bourns Inc., designed for surface mount applications. This component is rated for 450 mA continuous current with a maximum DC resistance of 700 mOhm and operates across the temperature range of -40°C to 125°C. The part maintains Active product status and is ROHS3 compliant, making it suitable for modern electronic assemblies requiring ferrite-core inductance in compact form factors.

Substitute parts become necessary when the primary component experiences supply constraints, extended lead times, or when design requirements permit operation within broader electrical parameters while maintaining functional equivalence.

Key Parameters

Parameter	PM74SH-221M-RC
Inductance	220 µH
Inductance Tolerance	±20%
Current Rating	450 mA
DC Resistance (Max)	700 mOhm
Shielding	Shielded
Core Material	Ferrite
Operating Temperature Range	-40°C to 125°C
Mounting Type	Surface Mount
Package Dimensions	7.00mm x 7.00mm x 4.80mm (Max)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the PM74SH-221M-RC is determined by the following critical parameters:

Primary Matching Criteria:

Inductance value: 220 µH (fixed requirement)
Inductance tolerance: ±20% (fixed requirement)
Mounting type: Surface Mount (fixed requirement)
Shielding: Shielded (fixed requirement)
Package dimensions: 7.00mm x 7.00mm footprint (fixed requirement)

Secondary Compatibility Parameters:

Current rating: Minimum 450 mA (equal or higher acceptable)
DC resistance: Maximum 700 mOhm (equal or lower acceptable)
Operating temperature: Minimum -40°C to 125°C range (equal or broader acceptable)
RoHS compliance: ROHS3 Compliant (required)

Both identified substitute parts meet the primary matching criteria and maintain compatibility within the secondary parameters, enabling direct substitution in applications where the PM74SH-221M-RC is specified.

Parameter Comparison

Parameter	PM74SH-221M-RC	SRR7045-221M	P1167.224NLT
Manufacturer	Bourns Inc.	Bourns Inc.	Pulse Electronics
Inductance	220 µH	220 µH	220 µH
Inductance Tolerance	±20%	±20%	±20%
Current Rating (Amps)	450 mA	640 mA	430 mA
DC Resistance (Max)	700 mOhm	700 mOhm	930 mOhm
Shielding	Shielded	Shielded	Shielded
Operating Temperature Range	-40°C to 125°C	-40°C to 125°C	-40°C to 130°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package Dimensions (L x W)	7.00mm x 7.00mm	7.00mm x 7.00mm	7.54mm x 7.54mm
Height (Max)	4.80mm	4.80mm	4.50mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

SRR7045-221M (Bourns Inc.): This substitute provides identical electrical specifications to the PM74SH-221M-RC with the exception of an elevated current rating of 640 mA versus 450 mA. The DC resistance remains at 700 mOhm maximum, and all dimensional and thermal characteristics are equivalent. Both parts are manufactured by Bourns Inc. and maintain ROHS3 compliance with Active product status. This substitute is suitable for applications where the higher current rating provides additional design margin without introducing any electrical or mechanical incompatibilities.

P1167.224NLT (Pulse Electronics): This substitute maintains the 220 µH inductance and ±20% tolerance with ROHS3 compliance and Active product status. The current rating of 430 mA is marginally lower than the primary part, while the DC resistance increases to 930 mOhm maximum. The operating temperature range extends to 130°C, providing broader thermal coverage. Package dimensions differ slightly (7.54mm x 7.54mm versus 7.00mm x 7.00mm), requiring verification of PCB layout compatibility. This substitute is applicable in applications where the slightly reduced current rating and increased DC resistance are acceptable within circuit design parameters.

Frequently Asked Questions (FAQ)

Q: Can SRR7045-221M be used as a direct replacement for PM74SH-221M-RC?

A: Yes. The SRR7045-221M maintains identical inductance, tolerance, DC resistance, operating temperature range, and package dimensions. The higher current rating of 640 mA versus 450 mA provides additional capacity without affecting substitution eligibility.

Q: What are the limitations of using P1167.224NLT as a substitute?

A: The P1167.224NLT exhibits two parameter differences: DC resistance increases from 700 mOhm to 930 mOhm maximum, and package dimensions increase from 7.00mm x 7.00mm to 7.54mm x 7.54mm. The current rating of 430 mA is also 20 mA lower than the primary part. PCB layout verification is required to confirm the larger footprint accommodates the design.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. Both SRR7045-221M and P1167.224NLT maintain ROHS3 compliance, matching the primary part's environmental and regulatory status.

Q: What is the significance of the ±20% inductance tolerance?

A: The ±20% tolerance defines the acceptable inductance range from 176 µH to 264 µH. All listed parts, including substitutes, share this tolerance specification, ensuring functional equivalence in circuit applications where this tolerance band is acceptable.

Q: Does the increased DC resistance of P1167.224NLT affect circuit performance?

A: The increase from 700 mOhm to 930 mOhm represents a 32.9% rise in maximum DC resistance. Circuit designers must evaluate whether this increased resistance introduces unacceptable power dissipation or voltage drop within the specific application context.

Q: Are there package compatibility concerns with P1167.224NLT?

A: Yes. The P1167.224NLT footprint of 7.54mm x 7.54mm exceeds the standard 7.00mm x 7.00mm footprint of the primary part. PCB layout and component placement must be verified to confirm adequate spacing and clearance for the larger package.

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