Equivalent & Substitute Parts for UP2.8B-331-R

Part Overview

The UP2.8B-331-R is a 330 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division, rated for 420 mA continuous current operation. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The part operates across the temperature range of -40°C to 85°C and is suitable for surface mount applications in nonstandard package configurations.

Substiute Parts

UP2.8B-331-R

Eaton - Electronics DivisionIn Stock: 724UP2.8B-331-R Datasheet

Current PartRFQ

P0762.334NLT

Pulse ElectronicsIn Stock: 884P0762.334NLT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UP2.8B-331-R is determined by strict alignment with the following core parameters:

Mandatory Matching Criteria:

• Inductance value: 330 µH (exact match required)
• Inductance tolerance: ±20% (identical specification)
• Shielding classification: Unshielded (electromagnetic field exposure must be equivalent)
• Mounting type: Surface Mount (PCB assembly compatibility)
• Inductance test frequency: 100 kHz (measurement reference standard)
• Package classification: Nonstandard (physical form factor compatibility)

Allowable Variation Parameters:

• Current rating: Substitute must equal or exceed 420 mA minimum
• Operating temperature range: Substitute must encompass or exceed -40°C to 85°C
• Core material: Wirewound construction acceptable; ferrite core preferred but not mandatory if electrical performance is maintained
• Product status: Active status preferred for long-term availability

The P0762.334NLT from Pulse Electronics qualifies as a substitute based on matching inductance, tolerance, shielding, mounting type, and test frequency specifications. Current rating of 300 mA is below the original 420 mA specification; however, saturation current rating of 400 mA provides operational margin for applications not requiring full 420 mA continuous current.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The P0762.334NLT qualifies as a functional equivalent for applications where the continuous current requirement does not exceed 300 mA. The substitute part maintains electrical equivalence through identical inductance value, tolerance, and test frequency specifications. Physical compatibility is confirmed through dimensional analysis, with the substitute occupying a marginally larger footprint (0.118" vs. 0.110" height) that remains within typical PCB assembly tolerances for nonstandard surface mount packages.

Product Status Advantage:

The substitute part carries Active product status from Pulse Electronics, providing superior long-term procurement availability compared to the Obsolete classification of the original UP2.8B-331-R. This status transition eliminates supply chain discontinuity risk for ongoing production and field service applications.

Compliance and Certification:

The P0762.334NLT provides explicit RoHS3 compliance certification and REACH unaffected status, offering regulatory documentation advantages over the original part specification. The extended operating temperature range (-40°C to 130°C) provides additional thermal margin beyond the original -40°C to 85°C specification.

Current Rating Consideration:

Applications requiring the full 420 mA continuous current rating of the original part cannot be satisfied by the P0762.334NLT continuous rating of 300 mA. However, the saturation current specification of 400 mA indicates operational capability for transient or intermittent current conditions approaching the original specification. Circuit designers must verify that application current profiles remain within the 300 mA continuous limit or accept transient operation at saturation current levels.

Frequently Asked Questions (FAQ)

Q: Can the P0762.334NLT directly replace the UP2.8B-331-R in all applications?

A: Direct replacement is applicable only for applications where continuous current does not exceed 300 mA. The substitute part maintains identical inductance, tolerance, and electromagnetic characteristics. Applications requiring sustained 420 mA operation require alternative sourcing or circuit redesign.

Q: What is the significance of the saturation current specification in the substitute part?

A: The 400 mA saturation current rating indicates the current level at which the inductor's inductance begins to degrade due to core saturation. This specification provides operational margin for transient current conditions but does not establish a continuous current rating. Continuous operation must remain within the 300 mA specification.

Q: Are the physical dimensions compatible for PCB assembly?

A: Yes. The substitute part dimensions (0.510" L x 0.370" W x 0.118" H) are dimensionally compatible with the original (0.508" L x 0.370" W x 0.110" H). The 0.002" length difference and 0.008" height difference fall within standard PCB assembly tolerances for nonstandard surface mount packages. Footprint verification with the PCB design file is recommended.

Q: What compliance advantages does the substitute part provide?

A: The P0762.334NLT carries explicit RoHS3 compliance certification and REACH unaffected status. The original part specification does not include these compliance declarations. For applications subject to RoHS or REACH regulatory requirements, the substitute part provides documented compliance evidence.

Q: Does the extended operating temperature range of the substitute part affect substitution eligibility?

A: No. The extended range (-40°C to 130°C) of the substitute part exceeds the original specification (-40°C to 85°C), providing additional thermal margin. This represents a specification improvement rather than a limitation for substitution purposes.

Q: What is the DC resistance impact of the substitute part?

A: The substitute part specifies a maximum DC resistance of 2.7 Ohm. The original part does not provide DC resistance data. In applications where inductor DC resistance contributes to circuit losses or voltage drop calculations, the 2.7 Ohm specification must be incorporated into circuit analysis. This parameter was not available for the original part and represents additional design information provided by the substitute.

Q: Is the substitute part suitable for high-frequency applications?

A: Both parts are characterized at 100 kHz inductance test frequency. The substitute part does not provide self-resonant frequency or Q factor specifications. Applications requiring operation significantly above 100 kHz require frequency response verification through testing or manufacturer consultation.