PM43-2R7M Equivalent & Substitute Parts Reference

Part Overview

The PM43-2R7M is a 2.7 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1.58 A with a DC resistance of 79mOhm. This component is classified as obsolete, making identification of suitable alternatives essential for ongoing design support and production continuity. The part operates across a temperature range of -40°C to 100°C and is not RoHS compliant.

Key Parameters

Parameter	Value
Inductance	2.7 µH
Current Rating	1.58 A
DC Resistance (DCR)	79mOhm
Shielding	Unshielded
Core Material	Ferrite
Tolerance	±20%
Operating Temperature	-40°C ~ 100°C
Mounting Type	Surface Mount
Package	Nonstandard (4.50mm x 4.00mm x 4.60mm)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters: inductance value, current rating capability, DC resistance, shielding configuration, core material, and physical package dimensions. The PM43-2R7M specifications establish the baseline requirements for any equivalent component.

SDR0403-2R7ML qualifies as a direct substitute based on matching inductance (2.7 µH), identical core material (ferrite), identical shielding (unshielded), and identical package dimensions (4.50mm x 4.00mm x 4.60mm). This part exceeds the current rating requirement (2.43 A vs. 1.58 A) and provides superior DC resistance (52mOhm vs. 79mOhm), representing an enhanced alternative with active product status and RoHS3 compliance.

SRR1806-150M does not qualify as a substitute. While manufactured by the same supplier and sharing ferrite core material, this part has a fundamentally different inductance value (15 µH vs. 2.7 µH), different shielding (shielded vs. unshielded), and different physical dimensions (18.30mm x 14.00mm x 7.10mm). These differences make it unsuitable for direct replacement in circuits designed for the PM43-2R7M.

Parameter Comparison

Parameter	PM43-2R7M	SDR0403-2R7ML	SRR1806-150M
Inductance	2.7 µH	2.7 µH	15 µH
Current Rating (Amps)	1.58 A	2.43 A	3.6 A
DC Resistance (DCR)	79mOhm	52mOhm Max	39mOhm
Shielding	Unshielded	Unshielded	Shielded
Core Material	Ferrite	Ferrite	Ferrite
Tolerance	±20%	±20%	±20%
Operating Temperature	-40°C ~ 100°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Size / Dimension	4.50mm x 4.00mm x 4.60mm	4.50mm x 4.00mm x 4.60mm	18.30mm x 14.00mm x 7.10mm
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SDR0403-2R7ML is the appropriate substitute for PM43-2R7M applications. This part maintains electrical equivalence through identical inductance and package dimensions while providing improved performance margins. The higher current rating (2.43 A) and lower DC resistance (52mOhm) offer design flexibility without compromising circuit function. The extended operating temperature range (-40°C to 125°C) and RoHS3 compliance address regulatory and environmental requirements that the obsolete PM43-2R7M cannot satisfy.

SRR1806-150M is not suitable for direct replacement due to fundamental parameter mismatches in inductance value and physical dimensions. This part should not be considered for PM43-2R7M substitution.

Frequently Asked Questions (FAQ)

Q: Can SDR0403-2R7ML be used as a direct replacement for PM43-2R7M?

A: Yes. Both parts share identical inductance (2.7 µH), core material (ferrite), shielding configuration (unshielded), and package dimensions (4.50mm x 4.00mm x 4.60mm). The SDR0403-2R7ML provides superior electrical performance with higher current rating and lower DC resistance.

Q: Why is SRR1806-150M listed if it cannot substitute for PM43-2R7M?

A: SRR1806-150M is included in the reference data but does not meet substitution criteria. Its 15 µH inductance, shielded configuration, and larger physical dimensions (18.30mm x 14.00mm x 7.10mm) make it incompatible with PM43-2R7M circuit requirements.

Q: What are the critical parameters for determining inductor substitution?

A: Inductance value, current rating, DC resistance, shielding type, core material, tolerance, and physical package dimensions are the primary parameters governing substitution eligibility. All must align with the original component specifications or circuit design requirements.

Q: Does the SDR0403-2R7ML fit the same PCB footprint as PM43-2R7M?

A: Yes. Both components have identical package dimensions of 4.50mm x 4.00mm with a maximum seated height of 4.60mm, ensuring PCB compatibility without layout modifications.

Q: What compliance advantages does SDR0403-2R7ML offer?

A: SDR0403-2R7ML is RoHS3 compliant and carries active product status, whereas PM43-2R7M is obsolete and non-compliant. This ensures long-term supply availability and regulatory alignment for new designs and production continuity.

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