PM43-3R9M-RC Equivalent & Substitute Parts

Part Overview

The PM43-3R9M-RC is a 3.9 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1.98 A continuous current with a maximum DC resistance of 76 mOhm. This surface mount component is designed for applications requiring fixed inductance in compact form factors. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when inventory constraints, lead time requirements, or design flexibility necessitate alternative sourcing while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Inductance	3.9 µH
Inductance Tolerance	±20%
Current Rating	1.98 A
Current - Saturation (Isat)	2.7 A
DC Resistance (DCR)	76 mOhm Max
Core Material	Ferrite
Shielding	Unshielded
Q Factor @ Frequency	28 @ 7.96 MHz
Self Resonant Frequency	55 MHz
Operating Temperature Range	-40°C to 125°C
Mounting Type	Surface Mount
Package Dimensions	4.50 mm L × 4.00 mm W × 4.60 mm H (Max)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the PM43-3R9M-RC is determined by strict equivalence across the following critical parameters:

Inductance value: 3.9 µH with ±20% tolerance
Current rating: 1.98 A minimum continuous current capability
DC resistance: 76 mOhm maximum
Core type: Ferrite drum core, unshielded construction
Saturation current: 2.7 A minimum
Q factor: 28 @ 7.96 MHz
Self resonant frequency: 55 MHz
Operating temperature range: -40°C to 125°C
Surface mount package with identical physical dimensions: 4.50 mm × 4.00 mm × 4.60 mm (Max)
Compliance certifications: RoHS3, MSL 1

The SDR0403-3R9ML meets all specified electrical and mechanical parameters, enabling direct substitution in applications where the PM43-3R9M-RC is specified.

Parameter Comparison

Parameter	PM43-3R9M-RC	SDR0403-3R9ML	Match Status
Manufacturer	Bourns Inc.	Bourns Inc.	Identical
Inductance	3.9 µH	3.9 µH	Identical
Inductance Tolerance	±20%	±20%	Identical
Current Rating	1.98 A	1.98 A	Identical
Saturation Current (Isat)	2.7 A	2.7 A	Identical
DC Resistance (DCR)	76 mOhm Max	76 mOhm Max	Identical
Core Material	Ferrite	Ferrite	Identical
Shielding	Unshielded	Unshielded	Identical
Q @ Frequency	28 @ 7.96 MHz	28 @ 7.96 MHz	Identical
Self Resonant Frequency	55 MHz	55 MHz	Identical
Operating Temperature	-40°C to 125°C	-40°C to 125°C	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Package Dimensions	4.50 mm × 4.00 mm × 4.60 mm (Max)	4.50 mm × 4.00 mm × 4.60 mm (Max)	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level	MSL 1 (Unlimited)	MSL 1 (Unlimited)	Identical
Product Status	Active	Active	Identical

Engineering Selection Recommendations

Both the PM43-3R9M-RC and SDR0403-3R9ML are active production components from Bourns Inc. with identical electrical specifications and physical dimensions. Selection between these parts should be based on:

Inventory availability: SDR0403-3R9ML currently has 10,300 pieces in stock versus 821 pieces for PM43-3R9M-RC
Lead time requirements: Higher inventory levels for SDR0403-3R9ML may provide shorter delivery schedules
Compliance requirements: Both parts meet ROHS3 and REACH requirements with MSL 1 rating
PCB layout and assembly compatibility: Identical package dimensions and surface mount configuration ensure direct substitution without design modification

No electrical performance degradation occurs when substituting SDR0403-3R9ML for PM43-3R9M-RC in circuit applications.

Frequently Asked Questions (FAQ)

Q: Can SDR0403-3R9ML be used as a direct replacement for PM43-3R9M-RC?

A: Yes. Both parts are manufactured by Bourns Inc. with identical inductance (3.9 µH), current rating (1.98 A), DC resistance (76 mOhm max), core material (ferrite), and physical dimensions (4.50 mm × 4.00 mm × 4.60 mm max). No circuit modifications are required.

Q: Are there any differences in electrical performance between these parts?

A: No. The Q factor (28 @ 7.96 MHz), self resonant frequency (55 MHz), saturation current (2.7 A), and operating temperature range (-40°C to 125°C) are identical across both parts.

Q: Do both parts have the same compliance certifications?

A: Yes. Both PM43-3R9M-RC and SDR0403-3R9ML are ROHS3 compliant, REACH unaffected, and rated MSL 1 (unlimited moisture sensitivity).

Q: What is the difference between the PM43 and SDR0403 series?

A: The PM43 and SDR0403 are different product series from Bourns Inc. The SDR0403-3R9ML is the equivalent part within the SDR0403 series that matches all electrical and mechanical specifications of the PM43-3R9M-RC.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes. Identical surface mount package dimensions and pinout configuration enable direct PCB substitution without layout or assembly process changes.

Q: What should be considered when selecting between these two parts?

A: Primary selection criteria are inventory availability and lead time. Both parts deliver identical electrical performance and physical compatibility. SDR0403-3R9ML has significantly higher stock levels, which may be advantageous for supply chain planning.

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