PM3316-680M Equivalent & Substitute Parts

Part Overview

The PM3316-680M is a 68 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1.5 A with 200 mOhm DC resistance. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part operates across -55°C to 105°C and is mounted as a surface mount device in a nonstandard package measuring 12.70mm × 10.00mm × 5.30mm (max height).

Key Parameters

Parameter	PM3316-680M Value
Inductance	68 µH
Inductance Tolerance	±20%
Current Rating	1.5 A
Current - Saturation (Isat)	1.4 A
DC Resistance (DCR)	200 mOhm
Shielding	Unshielded
Core Material	Ferrite
Type	Drum Core, Wirewound
Operating Temperature Range	-55°C to 105°C
Mounting Type	Surface Mount
Package / Case	Nonstandard
Size / Dimension	12.70mm L × 10.00mm W
Height - Seated (Max)	5.30mm
RoHS Status	RoHS non-compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the PM3316-680M is determined by the following critical parameters:

Primary Matching Criteria:

Inductance value: 68 µH (±20% tolerance acceptable)
Current rating: minimum 1.5 A
DC resistance: 200 mOhm or lower
Shielding configuration: unshielded preferred
Core type: ferrite drum core preferred
Mounting: surface mount
Physical footprint: compatible with 12.70mm × 10.00mm × 5.30mm envelope

Substitution Categories:

Direct Substitutes maintain all primary electrical and mechanical parameters within acceptable tolerances and are from the same manufacturer series.

Similar Substitutes meet the core electrical requirements (inductance, current rating, DCR) but may have variations in tolerance, temperature range, or physical dimensions that require design verification.

Parameter Comparison

Parameter	PM3316-680M	PM3316-680M-RC	SDR1005-680KL	ASPI-0804T-680M-T	DRA124-680-R	UP2-680-R	UP2B-680-R	UP2UC-680-R
Inductance	68 µH	68 µH	68 µH	68 µH	68 µH	68 µH	68 µH	68 µH
Tolerance	±20%	±20%	±10%	±20%	±20%	±20%	±20%	±20%
Current Rating (A)	1.5	1.2	1.2	1.4	1.454	1.7	1.5	1.5
Isat (A)	1.4	1.4	1.4	—	2.369	1.2	1.2	1.4
DCR (mOhm)	200	240	240	200	201	189.8	178.7	200
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Shielded	Unshielded	Unshielded	Unshielded
Core Type	Drum Core, Ferrite	Drum Core, Ferrite	Drum Core, Ferrite	Drum Core, Ferrite	Wirewound	Wirewound	Drum Core, Ferrite	Wirewound
Operating Temp (°C)	-55 to 105	-55 to 125	-40 to 125	-40 to 85	-40 to 165	—	-40 to 85	-25 to 85
Size L × W (mm)	12.70 × 10.00	12.70 × 10.00	12.70 × 10.00	12.95 × 9.40	12.50 × 12.50	13.74 × 8.76	13.97 × 10.41	12.70 × 10.00
Height Max (mm)	5.30	5.30	5.00	5.21	4.50	5.86	6.00	5.21
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

PM3316-680M-RC (Bourns Inc.) is the primary direct substitute. It maintains identical inductance, tolerance, and physical dimensions while offering improved product status (active) and ROHS3 compliance. The current rating reduction from 1.5 A to 1.2 A and DCR increase from 200 mOhm to 240 mOhm require circuit validation for applications operating near maximum current limits.

SDR1005-680KL (Bourns Inc.) provides tighter inductance tolerance (±10% vs ±20%) and active product status with ROHS3 compliance. Physical dimensions and height remain compatible. The 1.2 A current rating and 240 mOhm DCR match PM3316-680M-RC specifications.

UP2B-680-R (Eaton - Electronics Division) offers the lowest DCR at 178.7 mOhm maximum, matching the original 1.5 A current rating. Drum core ferrite construction and unshielded configuration align with the original design. ROHS3 compliance and active status are confirmed. Physical dimensions show minor increases (13.97mm L × 10.41mm W × 6.00mm H) requiring PCB layout verification.

UP2UC-680-R (Eaton - Electronics Division) matches the original current rating (1.5 A) and DCR (200 mOhm maximum) with identical physical length and width (12.70mm × 10.00mm). RoHS compliance is confirmed. Operating temperature range (-25°C to 85°C) is narrower than the original specification.

ASPI-0804T-680M-T (Abracon LLC) maintains 68 µH inductance, 1.4 A current rating, and 200 mOhm maximum DCR. Physical dimensions (12.95mm × 9.40mm × 5.21mm) are within acceptable tolerance. ROHS3 compliance is confirmed. Operating temperature range (-40°C to 85°C) is narrower than the original.

DRA124-680-R (Eaton - Electronics Division) provides the highest current saturation rating (2.369 A) and extended operating temperature range (-40°C to 165°C). Shielded configuration differs from the original unshielded design, requiring EMI/RFI evaluation. Physical footprint (12.50mm × 12.50mm) is larger and may require PCB layout adjustment. AEC-Q200 rating is available.

UP2-680-R (Eaton - Electronics Division) offers the highest current rating (1.7 A) and lowest DCR (189.8 mOhm maximum). Wirewound construction without specified core material differs from the original drum core design. Physical dimensions (13.74mm × 8.76mm × 5.86mm) require PCB verification.

Frequently Asked Questions (FAQ)

Q: Can PM3316-680M-RC be used as a direct replacement without circuit modification?

A: PM3316-680M-RC is electrically compatible for most applications. However, the reduced current rating (1.2 A vs 1.5 A) and increased DCR (240 mOhm vs 200 mOhm) require verification if the circuit operates above 1.2 A or has strict power dissipation limits. Identical physical dimensions allow direct PCB substitution.

Q: What is the difference between drum core and wirewound inductors in this comparison?

A: Drum core inductors (PM3316-680M, SDR1005-680KL, UP2B-680-R) use a ferrite drum structure, while wirewound inductors (UP2-680-R, UP2UC-680-R) use wire wound around a core. Both achieve 68 µH inductance but may exhibit different frequency response and Q characteristics. The original PM3316-680M uses drum core construction.

Q: Why does DRA124-680-R have a shielded configuration when the original is unshielded?

A: DRA124-680-R is a shielded variant designed to reduce electromagnetic interference. Shielding increases physical size and may affect circuit performance in applications sensitive to magnetic coupling. Use only if EMI mitigation is required.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant or RoHS compliant. The original PM3316-680M is RoHS non-compliant. Compliance verification is required for applications subject to RoHS regulations.

Q: What is the impact of inductance tolerance differences?

A: The original PM3316-680M has ±20% tolerance. SDR1005-680KL offers ±10% tolerance, providing tighter inductance control. Applications requiring precise inductance values benefit from the tighter tolerance. Other substitutes maintain ±20% tolerance matching the original.

Q: Can substitute parts with different physical dimensions be used?

A: Physical dimension variations require PCB layout verification. Parts with larger footprints (UP2-680-R, UP2B-680-R, DRA124-680-R) may not fit existing PCB layouts. Height differences affect clearance to adjacent components. Mechanical compatibility must be confirmed before substitution.

Q: Which substitute offers the best thermal performance?

A: DRA124-680-R supports the widest operating temperature range (-40°C to 165°C). For applications requiring extended high-temperature operation, DRA124-680-R is the optimal choice. Standard substitutes support -40°C to 125°C or -40°C to 85°C ranges.

Q: Is inventory availability a factor in substitute selection?

A: PM3316-680M-RC has 7,657 units in stock, providing immediate availability. UP2B-680-R (2,183 units), UP2UC-680-R (714 units), and ASPI-0804T-680M-T (1,448 units) offer moderate availability. UP2-680-R (955 units) has limited stock. Procurement timelines should factor inventory levels.

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