PM3308-680M Equivalent & Substitute Parts

Part Overview

The PM3308-680M is a 68 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 700 mA continuous current with a maximum DC resistance of 700mOhm. This surface mount component operates across the temperature range of -55°C to 125°C and is classified as obsolete product status.

Due to the obsolete status of the PM3308-680M, identifying equivalent and substitute parts is essential for design continuity and procurement. Substitute inductors must maintain the core electrical specifications: 68 µH inductance at ±20% tolerance, 700 mA current rating capability, and surface mount nonstandard packaging with comparable physical dimensions.

Substiute Parts

PM3308-680M

Bourns Inc.In Stock: 794PM3308-680M Datasheet

Current PartRFQ

P0762.683NLT

Pulse ElectronicsIn Stock: 861P0762.683NLT Datasheet

DirectRFQ

UP2.8B-680-R

Eaton - Electronics DivisionIn Stock: 824UP2.8B-680-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PM3308-680M are classified based on strict electrical and mechanical parameter alignment:

Direct Substitute (P0762.683NLT): Maintains identical inductance (68 µH), tolerance (±20%), current rating (700 mA), saturation current (900mA), and test frequency (100 kHz). DC resistance is reduced to 660mOhm maximum, representing an improvement over the original specification. Physical dimensions are nearly identical (12.95mm x 9.40mm vs. 13.00mm x 9.50mm). This part is active product status and RoHS3 compliant.

Similar Substitute (UP2.8B-680-R): Maintains identical inductance (68 µH), tolerance (±20%), and test frequency (100 kHz). Current rating is increased to 890 mA with saturation current of 1A, exceeding the original 700 mA requirement. DC resistance is significantly reduced to 480mOhm maximum. Physical dimensions are comparable (12.90mm x 9.40mm). This part is active product status and RoHS compliant. Operating temperature range is limited to -40°C ~ 85°C compared to the original -55°C ~ 125°C.

Parameter Comparison

Engineering Selection Recommendations

P0762.683NLT (Pulse Electronics) is the primary direct substitute for the PM3308-680M. This part maintains all critical electrical parameters while offering improved DC resistance (660mOhm vs. 700mOhm) and active product status. The part is RoHS3 compliant, addressing regulatory requirements that the original obsolete part does not meet. Operating temperature range extends to 130°C, providing additional thermal margin. Physical dimensions are virtually identical, ensuring PCB layout compatibility.

UP2.8B-680-R (Eaton) serves as an alternative substitute with enhanced electrical performance. The increased current rating (890 mA) and reduced DC resistance (480mOhm) provide design margin for applications requiring higher current capacity or lower power dissipation. However, the operating temperature range is constrained to -40°C ~ 85°C, which may limit suitability for applications requiring the original -55°C lower temperature specification. This part is RoHS compliant and maintains active product status.

Selection between these substitutes depends on application-specific requirements: choose P0762.683NLT for direct parameter matching and extended temperature range; choose UP2.8B-680-R for applications benefiting from higher current capacity and lower resistance characteristics within the -40°C ~ 85°C operating window.

Frequently Asked Questions (FAQ)

Q: Can P0762.683NLT directly replace PM3308-680M without circuit modifications?

A: Yes. P0762.683NLT maintains identical inductance (68 µH), tolerance (±20%), current rating (700 mA), and saturation current (900mA). DC resistance is improved at 660mOhm maximum. Physical dimensions are nearly identical, ensuring PCB compatibility. No circuit modifications are required.

Q: What is the primary difference between P0762.683NLT and UP2.8B-680-R?

A: Both parts maintain the 68 µH inductance specification. P0762.683NLT matches the original 700 mA current rating, while UP2.8B-680-R provides increased current capacity at 890 mA. UP2.8B-680-R offers significantly lower DC resistance (480mOhm vs. 660mOhm). Operating temperature ranges differ: P0762.683NLT extends to 130°C; UP2.8B-680-R is limited to 85°C maximum.

Q: Is the operating temperature range difference between substitutes critical?

A: Temperature range selection depends on application requirements. If the circuit operates below -40°C or above 85°C, P0762.683NLT is required. For applications within -40°C ~ 85°C, UP2.8B-680-R is suitable and offers superior electrical performance.

Q: Are both substitute parts RoHS compliant?

A: Yes. P0762.683NLT is RoHS3 compliant. UP2.8B-680-R is RoHS compliant. The original PM3308-680M is RoHS non-compliant. Both substitutes meet current regulatory requirements.

Q: How do DC resistance differences affect circuit performance?

A: Lower DC resistance reduces power dissipation and heat generation. P0762.683NLT (660mOhm) reduces dissipation by approximately 5.7% compared to the original (700mOhm). UP2.8B-680-R (480mOhm) reduces dissipation by approximately 31.4%. In applications with tight thermal budgets or high current cycling, the lower resistance of UP2.8B-680-R provides measurable benefits.

Q: What packaging format is used for these substitute parts?

A: All three parts use nonstandard surface mount packaging with comparable physical dimensions. P0762.683NLT and UP2.8B-680-R are supplied in Tape & Reel (TR) format, standard for production assembly. Verify tape specifications with your procurement department if custom reel configurations are required.