PM3308-220M Equivalent & Substitute Parts

Part Overview

The PM3308-220M is a 22 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1.3 A with a maximum DC resistance of 230 mOhm. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The part operates across a temperature range of -55°C to 125°C and is mounted as a surface mount device in a nonstandard package measuring 13.00mm × 9.50mm × 3.00mm (height).

Substiute Parts

PM3308-220M

Bourns Inc.In Stock: 1176PM3308-220M Datasheet

Current PartRFQ

P0762.223NLT

Pulse ElectronicsIn Stock: 1031P0762.223NLT Datasheet

DirectRFQ

UP2.8B-220-R

Eaton - Electronics DivisionIn Stock: 1163UP2.8B-220-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PM3308-220M are identified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Critical Matching Parameters:

• Inductance value: 22 µH
• Inductance tolerance: ±20%
• Current rating: minimum 1.3 A
• DC resistance: maximum 230 mOhm
• Shielding configuration: Unshielded
• Mounting type: Surface Mount
• Test frequency: 100 kHz

Acceptable Variation Parameters:

• Current saturation (Isat): may exceed 1.6 A
• Operating temperature range: may differ if minimum and maximum bounds encompass or exceed the original specification
• Package dimensions: minor variations acceptable within assembly constraints
• Core material: ferrite or equivalent unshielded wirewound construction

Substitutes are classified into two categories: direct equivalents (matching all critical parameters) and similar alternatives (meeting electrical requirements with minor mechanical or thermal variations).

Parameter Comparison

Engineering Selection Recommendations

P0762.223NLT (Pulse Electronics) - Direct Equivalent: This part provides the closest electrical match to the PM3308-220M, with identical inductance, tolerance, current rating, saturation current, and DC resistance specifications. Package dimensions are within 0.05mm variance on length and width, with matching 3.00mm height. The operating temperature range of -40°C to 130°C encompasses the original -55°C to 125°C specification at the upper bound but does not extend to the lower -55°C limit. This part is currently in active production status with ROHS3 compliance, supporting long-term supply chain stability.

UP2.8B-220-R (Eaton - Electronics Division) - Similar Alternative: This part meets all critical electrical parameters with a higher current rating (1.5 A vs. 1.3 A) and improved DC resistance (190 mOhm vs. 230 mOhm maximum). Package dimensions are comparable with a 0.2mm reduction in height (2.80mm vs. 3.00mm). The operating temperature range of -40°C to 85°C does not extend to the original -55°C minimum or 125°C maximum. This part is actively produced with RoHS compliance and is available in Tape & Reel packaging. Selection of this alternative requires verification that the reduced temperature range and lower profile height are compatible with the target application.

Frequently Asked Questions (FAQ)

Q: Can P0762.223NLT directly replace PM3308-220M without circuit modification? A: P0762.223NLT matches all critical electrical parameters (inductance, tolerance, current rating, DC resistance) and package height. However, the operating temperature minimum of -40°C does not extend to the original -55°C specification. Direct substitution is appropriate for applications operating within -40°C to 125°C. Applications requiring -55°C operation require alternative selection or thermal analysis.

Q: What are the key differences between P0762.223NLT and UP2.8B-220-R? A: Both parts meet the 22 µH inductance and 1.3 A minimum current requirement. P0762.223NLT provides exact electrical matching with the original part. UP2.8B-220-R offers improved performance (1.5 A rating, 190 mOhm DCR) but with a reduced operating temperature range (-40°C to 85°C) and lower profile height (2.80mm vs. 3.00mm). Selection depends on thermal requirements and available PCB assembly height.

Q: Are there packaging or supply chain considerations for these substitutes? A: P0762.223NLT is supplied in standard packaging configurations. UP2.8B-220-R is available in Tape & Reel (TR) format, which may require adjustment to procurement and assembly processes. Both parts are currently in active production with established supply chains.

Q: How do compliance certifications affect part selection? A: The original PM3308-220M is RoHS non-compliant. Both substitute parts (P0762.223NLT with ROHS3 compliance and UP2.8B-220-R with RoHS compliance) meet current regulatory requirements. Selection should align with target market compliance mandates.

Q: What is the impact of DC resistance differences on circuit performance? A: The PM3308-220M specifies 230 mOhm maximum DCR. P0762.223NLT matches this specification exactly. UP2.8B-220-R provides 190 mOhm maximum, representing a 17% improvement in resistance characteristics. Lower DCR reduces resistive losses and heat generation, benefiting thermal performance in current-limited applications.