PM3316-6R8M Equivalent & Substitute Parts

Part Overview

The PM3316-6R8M is a 6.8 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 4.4 A continuous current with 27 mOhm DC resistance. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The PM3316-6R8M operates across the temperature range of -55°C to 105°C and is designed for surface mount applications in nonstandard packaging. Due to its obsolete status, identifying compatible alternatives ensures design continuity and supply chain reliability.

Key Parameters

Parameter	Value
Inductance	6.8 µH
Tolerance	±20%
Current Rating	4.4 A
DC Resistance (DCR)	27 mOhm
Current - Saturation (Isat)	4.6 A
Core Material	Ferrite
Shielding	Unshielded
Operating Temperature Range	-55°C to 105°C
Mounting Type	Surface Mount
Package Type	Nonstandard
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the PM3316-6R8M is determined by the following critical parameters:

Primary Matching Criteria:

Inductance value: 6.8 µH (±20% tolerance acceptable)
Core material: Ferrite, unshielded drum core wirewound construction
Current rating: Minimum 4.4 A continuous
DC resistance: Maximum 27 mOhm (lower values acceptable)
Saturation current: Minimum 4.6 A
Mounting type: Surface mount
Operating temperature: Must support -55°C minimum

Substitution Categories:

Direct Equivalent: PM3316-6R8M-RC matches the PM3316-6R8M in inductance, tolerance, core material, and shielding. Both are from the PM3316 series with identical physical dimensions and nonstandard packaging.

Similar Equivalent: SDR1005-6R8ML and ASPI-0804T-6R8M-T provide equivalent inductance, tolerance, core material, and current ratings. These parts maintain the same electrical performance within specified tolerances.

Non-Equivalent: CM453232-390KL does not qualify as a substitute due to significantly different inductance (39 µH versus 6.8 µH) and current rating (150 mA versus 4.4 A).

Parameter Comparison

Parameter	PM3316-6R8M	PM3316-6R8M-RC	SDR1005-6R8ML	ASPI-0804T-6R8M-T
Inductance	6.8 µH	6.8 µH	6.8 µH	6.8 µH
Tolerance	±20%	±20%	±20%	±20%
Current Rating (Amps)	4.4 A	3.4 A	3.4 A	4.6 A
DC Resistance (DCR)	27 mOhm	30 mOhm	30 mOhm Max	27 mOhm Max
Current - Saturation (Isat)	4.6 A	4.5 A	4.5 A	Not specified
Core Material	Ferrite	Ferrite	Ferrite	Ferrite
Shielding	Unshielded	Unshielded	Unshielded	Unshielded
Operating Temperature Range	-55°C to 105°C	-55°C to 125°C	-40°C to 125°C	-40°C to 85°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	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

PM3316-6R8M-RC (Direct Equivalent - Recommended Primary Substitute)

PM3316-6R8M-RC is the preferred direct equivalent. Both components share the PM3316 series designation, identical inductance and tolerance specifications, matching physical dimensions (12.70mm × 10.00mm × 5.30mm), and equivalent DC resistance. PM3316-6R8M-RC is currently in active production status with ROHS3 compliance, providing long-term supply availability. The extended operating temperature range (-55°C to 125°C) provides additional thermal margin compared to the original part.

Current rating is reduced from 4.4 A to 3.4 A. Applications requiring the full 4.4 A rating must evaluate whether 3.4 A saturation current is acceptable for the circuit design.

SDR1005-6R8ML (Similar Equivalent - Secondary Option)

SDR1005-6R8ML provides equivalent inductance, tolerance, and core material specifications. Physical dimensions are identical to PM3316-6R8M (12.70mm × 10.00mm), with slightly reduced height (5.00mm versus 5.30mm). This part is active production with ROHS3 compliance.

Current rating is 3.4 A, matching PM3316-6R8M-RC. The operating temperature range extends to -40°C minimum, which is acceptable for applications not requiring -55°C operation.

ASPI-0804T-6R8M-T (Similar Equivalent - Alternative Option)

ASPI-0804T-6R8M-T, manufactured by Abracon LLC, matches the original PM3316-6R8M current rating of 4.6 A and DC resistance of 27 mOhm. Physical dimensions are similar (12.95mm × 9.40mm × 5.21mm). This part is active production with ROHS3 compliance.

Operating temperature range is limited to -40°C to 85°C, which does not support the original -55°C minimum specification. This part is suitable only for applications operating within the -40°C to 85°C range.

CM453232-390KL (Not Equivalent)

CM453232-390KL is not a suitable substitute. The inductance value of 39 µH and current rating of 150 mA are fundamentally incompatible with the PM3316-6R8M specifications.

Frequently Asked Questions (FAQ)

Q: Can PM3316-6R8M-RC be used as a direct replacement for PM3316-6R8M?

A: PM3316-6R8M-RC is electrically equivalent in inductance, tolerance, and DC resistance. Both share identical physical dimensions and nonstandard packaging. The primary difference is reduced current rating (3.4 A versus 4.4 A). Substitution is valid if the circuit design operates at or below 3.4 A continuous current.

Q: What is the difference between "Direct" and "Similar" equivalents?

A: Direct equivalents share the same manufacturer series designation and are designed as production replacements. Similar equivalents provide equivalent electrical performance but may be from different manufacturer series or have minor dimensional variations. Both categories meet the core electrical specifications of the original part.

Q: Does the reduced current rating of PM3316-6R8M-RC affect circuit performance?

A: Current rating determines the maximum continuous current the inductor can handle without exceeding temperature limits. If your circuit operates below 3.4 A, the reduced rating has no impact. If your circuit requires 4.4 A continuous operation, PM3316-6R8M-RC is not suitable; ASPI-0804T-6R8M-T should be evaluated instead.

Q: Are all substitute parts RoHS compliant?

A: PM3316-6R8M-RC, SDR1005-6R8ML, and ASPI-0804T-6R8M-T are all ROHS3 compliant. The original PM3316-6R8M is RoHS non-compliant. If RoHS compliance is required for your application, all listed substitutes meet this requirement.

Q: What is the impact of operating temperature range differences?

A: PM3316-6R8M operates from -55°C to 105°C. PM3316-6R8M-RC and SDR1005-6R8ML extend the upper limit to 125°C. ASPI-0804T-6R8M-T has a reduced range of -40°C to 85°C. Select a substitute based on your application's actual operating temperature requirements. If your circuit operates only within -40°C to 85°C, all substitutes are acceptable. If -55°C operation is required, only PM3316-6R8M-RC and SDR1005-6R8ML are suitable.

Q: Can I use SDR1005-6R8ML if my application requires 4.4 A?

A: No. SDR1005-6R8ML is rated for 3.4 A continuous current. Using it in a 4.4 A application exceeds its current rating and may cause thermal damage. For 4.4 A applications, ASPI-0804T-6R8M-T is the only substitute that meets the current requirement, provided the operating temperature range (-40°C to 85°C) is acceptable.

Q: Why is CM453232-390KL listed in the original part's substitute field?

A: CM453232-390KL appears in the PM3316-6R8M substitute list but does not meet the electrical specifications required for substitution. The 39 µH inductance and 150 mA current rating are fundamentally different from the 6.8 µH, 4.4 A specifications. This part should not be used as a substitute.

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