PM43-8R2M Equivalent & Substitute Parts

Part Overview

The PM43-8R2M is an 8.2 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 840 mA with a DC resistance of 147mOhm. This component operates across the temperature range of -40°C to 100°C and is classified as obsolete. Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity and procurement planning. Substitute parts must maintain the same inductance value and core type while meeting or exceeding the electrical performance requirements of the original specification.

Key Parameters

Parameter	PM43-8R2M
Inductance	8.2 µH
Tolerance	±20%
Current Rating	840 mA
DC Resistance (DCR)	147mOhm
Core Type	Ferrite Drum Core, Unshielded
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 100°C
Package Size	4.50mm x 4.00mm x 4.60mm
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the PM43-8R2M is evaluated based on the following critical parameters:

Primary Matching Criteria:

Inductance value: 8.2 µH (exact match required)
Core type: Ferrite drum core, unshielded
Mounting type: Surface Mount
Package footprint: 4.50mm x 4.00mm maximum dimensions

Secondary Compatibility Criteria:

Current rating: Must equal or exceed 840 mA
DC resistance: Should not significantly exceed 147mOhm to maintain circuit performance
Operating temperature range: Must support -40°C minimum
Tolerance: ±20% or better

The SDR0403-8R2ML qualifies as a direct substitute, matching the inductance value, core type, and footprint while providing superior electrical performance. The SDR0604-121KL does not qualify as a functional substitute due to its significantly different inductance value (120 µH versus 8.2 µH), which would alter circuit behavior.

Parameter Comparison

Parameter	PM43-8R2M	SDR0403-8R2ML	SDR0604-121KL
Inductance	8.2 µH	8.2 µH	120 µH
Tolerance	±20%	±20%	±10%
Current Rating (Amps)	840 mA	1.26 A	480 mA
DC Resistance (DCR)	147mOhm	130mOhm Max	930mOhm Max
Core Type	Ferrite Drum Core, Unshielded	Ferrite Drum Core, Unshielded	Ferrite Drum Core, Unshielded
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 100°C	-40°C ~ 125°C	-40°C ~ 125°C
Package Size (L x W x H)	4.50mm x 4.00mm x 4.60mm	4.50mm x 4.00mm x 4.60mm	5.80mm x 5.80mm x 4.80mm
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SDR0403-8R2ML is the qualified substitute for PM43-8R2M applications. This part maintains identical inductance and core specifications while providing enhanced electrical performance: current rating increased to 1.26 A (50% higher than the original), DC resistance reduced to 130mOhm maximum (12% lower), and extended operating temperature range to 125°C. The SDR0403-8R2ML is ROHS3 compliant and carries active product status, ensuring long-term availability and supply chain stability. Footprint compatibility is confirmed with identical 4.50mm x 4.00mm x 4.60mm dimensions.

SDR0604-121KL is not suitable as a substitute. Although it shares the same core type and mounting technology, the inductance value of 120 µH differs fundamentally from the required 8.2 µH specification. This 14.6x increase in inductance would cause circuit malfunction and is not interchangeable regardless of other parameter similarities.

Frequently Asked Questions (FAQ)

Q: Can SDR0604-121KL be used in place of PM43-8R2M?

A: No. The SDR0604-121KL has an inductance value of 120 µH, which is fundamentally incompatible with the 8.2 µH requirement of the PM43-8R2M. Inductance is a primary circuit parameter; substitution requires exact or near-exact matching. The SDR0604-121KL is listed in the original part data but does not qualify as a functional equivalent.

Q: Is the SDR0403-8R2ML footprint compatible with PM43-8R2M PCB layouts?

A: Yes. Both parts share identical surface mount package dimensions of 4.50mm length x 4.00mm width x 4.60mm maximum height. PCB land patterns and assembly processes require no modification.

Q: What are the advantages of switching to SDR0403-8R2ML?

A: The SDR0403-8R2ML provides three key improvements: (1) higher current rating of 1.26 A versus 840 mA, allowing operation in higher-power applications; (2) lower DC resistance of 130mOhm maximum versus 147mOhm, reducing power dissipation; (3) ROHS3 compliance and active product status, ensuring regulatory alignment and supply availability.

Q: Does the extended temperature range of SDR0403-8R2ML affect compatibility?

A: No. The SDR0403-8R2ML operating range of -40°C to 125°C encompasses the PM43-8R2M range of -40°C to 100°C. Extended temperature capability does not create incompatibility; it provides additional operational margin.

Q: Are there packaging differences between PM43-8R2M and SDR0403-8R2ML?

A: The PM43-8R2M is supplied in nonstandard packaging. The SDR0403-8R2ML is supplied in Tape & Reel (TR) format, which is standard for high-volume surface mount assembly. This difference affects procurement and handling but not electrical or mechanical compatibility.

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