PM3308-100M Equivalent & Substitute Parts Reference

Part Overview

The PM3308-100M is a 10 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 2 A continuous current with a maximum DC resistance of 110 mOhm. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. Substitute parts must maintain the same inductance value, current rating, and DC resistance specifications to ensure circuit performance and reliability.

Substiute Parts

PM3308-100M

Bourns Inc.In Stock: 1007PM3308-100M Datasheet

Current PartRFQ

P0762.103NLT

Pulse ElectronicsIn Stock: 1183P0762.103NLT Datasheet

DirectRFQ

UP2.8B-100-R

Eaton - Electronics DivisionIn Stock: 817UP2.8B-100-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PM3308-100M are classified based on electrical parameter compatibility and mechanical fit within the specified envelope. The primary substitution criteria are:

Critical Matching Parameters:

• Inductance: 10 µH (exact match required)
• Current Rating: 2 A minimum
• DC Resistance: 110 mOhm maximum
• Tolerance: ±20%
• Shielding: Unshielded
• Mounting Type: Surface Mount
• Inductance Test Frequency: 100 kHz

Direct Substitute (Electrical & Mechanical Equivalence): The P0762.103NLT from Pulse Electronics meets all critical electrical parameters with identical inductance, current rating, and DC resistance specifications. Physical dimensions are within acceptable tolerance (0.510" L x 0.370" W vs. 0.512" L x 0.374" W), and height is identical at 0.118" (3.00mm). This part is classified as active and RoHS3 compliant.

Similar Substitute (Electrical Compatibility with Parameter Variations): The UP2.8B-100-R from Eaton - Electronics Division maintains the same inductance and tolerance but exhibits improved electrical performance with lower DC resistance (80 mOhm vs. 110 mOhm) and higher current rating (2.1 A vs. 2 A). Physical dimensions are comparable (0.508" L x 0.370" W), though height is reduced to 0.110" (2.80mm). This part is active and RoHS compliant but operates within a narrower temperature range (-40°C ~ 85°C vs. -55°C ~ 125°C).

Parameter Comparison

Engineering Selection Recommendations

P0762.103NLT (Pulse Electronics) - Recommended Direct Substitute: This part provides complete electrical and mechanical equivalence to the PM3308-100M. Active product status ensures long-term availability and supply chain stability. RoHS3 compliance supports modern manufacturing and environmental regulatory requirements. Operating temperature range (-40°C ~ 130°C) covers the original specification with extended upper limit capability. Identical DC resistance and current ratings guarantee drop-in compatibility without circuit redesign.

UP2.8B-100-R (Eaton - Electronics Division) - Alternative with Enhanced Performance: This part is suitable for applications where improved electrical performance is beneficial or required. Lower DC resistance (80 mOhm vs. 110 mOhm) reduces power dissipation and heat generation. Higher current rating (2.1 A) and saturation current (2.7 A) provide additional design margin. Active product status and RoHS compliance ensure availability and regulatory alignment. Selection of this part requires verification that the reduced operating temperature upper limit (-40°C ~ 85°C vs. -55°C ~ 125°C) is compatible with the application environment. Reduced height (2.80mm vs. 3.00mm) may provide PCB layout advantages in space-constrained designs.

Frequently Asked Questions (FAQ)

Q: Can P0762.103NLT be used as a direct replacement for PM3308-100M? A: Yes. The P0762.103NLT maintains identical inductance (10 µH), current rating (2 A), DC resistance (110 mOhm Max), and tolerance (±20%) specifications. Physical dimensions are within acceptable tolerance, and mounting type is identical. This part is classified as a direct substitute.

Q: What are the key differences between P0762.103NLT and UP2.8B-100-R? A: Both parts maintain the same inductance and tolerance. The UP2.8B-100-R offers lower DC resistance (80 mOhm vs. 110 mOhm), higher current rating (2.1 A vs. 2 A), and higher saturation current (2.7 A vs. 2.4 A). However, the UP2.8B-100-R operates within a narrower temperature range (-40°C ~ 85°C vs. -40°C ~ 130°C) and has reduced height (2.80mm vs. 3.00mm).

Q: Is the PM3308-100M still available for purchase? A: The PM3308-100M is classified as obsolete. Current inventory exists (908 Pcs reported), but long-term availability cannot be guaranteed. Migration to active substitute parts (P0762.103NLT or UP2.8B-100-R) is recommended for new designs and ongoing production.

Q: What is the impact of RoHS compliance on part selection? A: The PM3308-100M is RoHS non-compliant. Both substitute parts (P0762.103NLT and UP2.8B-100-R) are RoHS compliant, supporting modern manufacturing standards and environmental regulations. Selection of RoHS-compliant parts is recommended for new designs and applications subject to regulatory requirements.

Q: Can UP2.8B-100-R be used in applications requiring the full temperature range of PM3308-100M? A: No. The UP2.8B-100-R operates within -40°C ~ 85°C, which does not cover the lower temperature limit (-55°C) of the original part. Use of this part is restricted to applications where the operating temperature range -40°C ~ 85°C is acceptable. For applications requiring the full -55°C ~ 125°C range, P0762.103NLT is the appropriate substitute.

Q: Are there any PCB layout considerations when substituting these parts? A: Physical dimensions are comparable across all three parts, with maximum variation of 0.004" (0.10mm) in length and width. Height variation is more significant: UP2.8B-100-R is 0.008" (0.20mm) shorter than the original. Verify that reduced height does not impact PCB clearance or mechanical assembly in space-constrained designs. All parts are surface mount with identical mounting type.

Q: What is the significance of the 100 kHz inductance test frequency? A: The inductance value of 10 µH is measured and specified at 100 kHz. This frequency is standard for inductor characterization and ensures consistent performance measurement across all three parts. Circuit designers should account for frequency-dependent inductance variation outside this test frequency in high-frequency applications.