PM1608-2R2M Equivalent & Substitute Parts

Part Overview

The PM1608-2R2M is a 2.2 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 2.4 A with a maximum DC resistance of 70 mOhm. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The part operates across the temperature range of -40°C to 85°C and is mounted as a surface mount device in a nonstandard package. Due to its obsolete status, active production alternatives with equivalent or comparable electrical characteristics are required for new designs and production continuity.

Key Parameters

Parameter	Value
Inductance	2.2 µH
Inductance Tolerance	±20%
Current Rating	2.4 A
Current - Saturation (Isat)	2.3 A
DC Resistance (DCR)	70 mOhm Max
Core Material	Ferrite
Shielding	Unshielded
Operating Temperature Range	-40°C to 85°C
Mounting Type	Surface Mount
Package Type	Nonstandard
RoHS Status	RoHS Non-Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the PM1608-2R2M is determined by the following critical parameters:

Primary Substitution Criteria:

Inductance value: 2.2 µH (±20% tolerance)
Current rating: minimum 2.4 A
DC resistance: 70 mOhm maximum
Core type: Ferrite, unshielded
Mounting: Surface mount
Operating temperature: minimum -40°C to 85°C coverage

Substitute Classification:

Direct Equivalent (SDR6603-2R2M): Identical electrical specifications across inductance, current rating, DC resistance, saturation current, and physical dimensions. Active product status with RoHS3 compliance and extended temperature range (-40°C to 125°C).

Similar Substitute (SDR0703-2R2ML): Matches inductance and core type with reduced current rating (1.8 A vs. 2.4 A) and lower DC resistance (60 mOhm vs. 70 mOhm). Suitable for applications with lower current requirements. Active product with RoHS3 compliance.

Similar Substitute (P0770.222NL): Matches inductance, current rating (2.3 A), and DC resistance specifications. Manufactured by Pulse Electronics with extended temperature range (-40°C to 130°C). Active product with RoHS3 compliance.

Non-Equivalent Part (CM453232-181KL): Significantly different inductance value (180 µH vs. 2.2 µH) and current rating (102 mA vs. 2.4 A). Listed in source data but electrically incompatible for direct substitution.

Parameter Comparison

Parameter	PM1608-2R2M	SDR6603-2R2M	SDR0703-2R2ML	P0770.222NL
Inductance	2.2 µH	2.2 µH	2.2 µH	2.2 µH
Inductance Tolerance	±20%	±20%	±20%	±20%
Current Rating (Amps)	2.4 A	2.4 A	1.8 A	2.3 A
Current - Saturation (Isat)	2.3 A	2.3 A	2.6 A	2.3 A
DC Resistance (DCR)	70 mOhm Max	70 mOhm Max	60 mOhm Max	70 mOhm Max
Core Material	Ferrite	Ferrite	Ferrite	Not Specified
Shielding	Unshielded	Unshielded	Unshielded	Unshielded
Operating Temperature Range	-40°C to 85°C	-40°C to 125°C	-40°C to 125°C	-40°C to 130°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package Type	Nonstandard	Nonstandard	Nonstandard	Nonstandard
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: SDR6603-2R2M

The SDR6603-2R2M is the optimal substitute for the obsolete PM1608-2R2M. This Bourns Inc. part provides identical electrical specifications including inductance (2.2 µH), current rating (2.4 A), DC resistance (70 mOhm maximum), and saturation current (2.3 A). Physical dimensions and mounting characteristics are equivalent. The part is in active production status with RoHS3 compliance, providing long-term supply assurance and regulatory alignment for new designs.

Secondary Recommendation: P0770.222NL

The P0770.222NL from Pulse Electronics serves as an alternative substitute when SDR6603-2R2M availability is constrained. This part matches the critical electrical parameters: 2.2 µH inductance, 2.3 A current rating, and 70 mOhm DC resistance. The extended operating temperature range (-40°C to 130°C) provides additional thermal margin. RoHS3 compliance and active production status support procurement continuity.

Conditional Recommendation: SDR0703-2R2ML

The SDR0703-2R2ML is suitable only for applications where the circuit design accommodates a reduced current rating of 1.8 A (versus the original 2.4 A specification). This part offers improved DC resistance performance (60 mOhm) and maintains all other critical parameters. Use is restricted to designs with verified current margin analysis.

Not Recommended: CM453232-181KL

The CM453232-181KL exhibits fundamentally different electrical characteristics (180 µH inductance, 102 mA current rating) and is electrically incompatible with the PM1608-2R2M. This part should not be considered for substitution.

Frequently Asked Questions (FAQ)

Q: Can the SDR6603-2R2M be used as a direct drop-in replacement for the PM1608-2R2M?

A: Yes. The SDR6603-2R2M provides identical inductance (2.2 µH), current rating (2.4 A), DC resistance (70 mOhm maximum), and physical dimensions. Both parts are unshielded ferrite drum core inductors with nonstandard packaging and surface mount mounting. No circuit modifications are required.

Q: What is the difference between the SDR6603-2R2M and SDR0703-2R2ML?

A: The primary difference is current rating: SDR6603-2R2M is rated for 2.4 A while SDR0703-2R2ML is rated for 1.8 A. The SDR0703-2R2ML offers lower DC resistance (60 mOhm vs. 70 mOhm) and slightly different physical dimensions. Selection depends on circuit current requirements.

Q: Why is the PM1608-2R2M obsolete?

A: The PM1608-2R2M is classified as obsolete by Bourns Inc. Active production has been discontinued. The SDR6603-2R2M and SDR0703-2R2ML represent the current product line alternatives with equivalent or comparable specifications.

Q: Are all substitute parts RoHS compliant?

A: Yes. The SDR6603-2R2M, SDR0703-2R2ML, and P0770.222NL are all RoHS3 compliant. The original PM1608-2R2M is RoHS non-compliant. Designs requiring RoHS compliance must transition to one of the active substitute parts.

Q: What is the temperature operating range difference between substitutes?

A: The PM1608-2R2M operates from -40°C to 85°C. The SDR6603-2R2M and SDR0703-2R2ML extend this to -40°C to 125°C. The P0770.222NL provides the widest range at -40°C to 130°C. All substitutes cover the original temperature specification with additional margin.

Q: Can P0770.222NL be used interchangeably with SDR6603-2R2M?

A: Yes, for most applications. Both parts match the critical specifications: 2.2 µH inductance, approximately 2.3-2.4 A current rating, and 70 mOhm DC resistance. The P0770.222NL is manufactured by Pulse Electronics rather than Bourns Inc. Verify supplier availability and lead times for your procurement timeline.

Q: What does "nonstandard package" mean for these inductors?

A: Nonstandard package indicates these inductors do not conform to industry-standard package dimensions such as 0603, 0805, or 1206. All four parts in this comparison use nonstandard packaging with identical or very similar physical dimensions (approximately 6.6mm × 4.45mm × 2.92mm). PCB footprint compatibility should be verified during design transition.

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