PM0603-56NJ Equivalent & Substitute Parts

Part Overview

The PM0603-56NJ is a 56 nH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 600 mA with 310mOhm DC resistance in a 0603 (1608 Metric) surface mount package. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support and procurement continuity. The part operates across -40°C to 125°C with a self-resonant frequency of 1.9 GHz and demonstrates a Q factor of 40 at 200 MHz.

Substiute Parts

PM0603-56NJ

Bourns Inc.In Stock: 868PM0603-56NJ Datasheet

Current PartRFQ

CW160808-56NJ

Bourns Inc.In Stock: 978CW160808-56NJ Datasheet

DirectRFQ

CI160808-56NJ

Bourns Inc.In Stock: 901CI160808-56NJ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the PM0603-56NJ are classified based on electrical and mechanical compatibility within the following criteria:

Direct Substitutes maintain identical or equivalent electrical performance across all critical parameters: inductance value (56 nH ±5%), current rating (600 mA minimum), DC resistance (310mOhm), package footprint (0603/1608 Metric), and operating temperature range (-40°C to 125°C).

Similar Substitutes share the same inductance value, package, and core material but differ in one or more electrical specifications such as current rating, DC resistance, or frequency characteristics. These parts require circuit-level evaluation to confirm suitability.

The substitution logic prioritizes:

• Inductance value and tolerance
• Current rating capability
• DC resistance specification
• Physical package compatibility
• Operating temperature range

Parameter Comparison

Engineering Selection Recommendations

CW160808-56NJ is the primary direct substitute for PM0603-56NJ. This part maintains electrical equivalence across all critical parameters: identical inductance (56 nH ±5%), current rating (600 mA), and DC resistance (310mOhm). The CW160808-56NJ is currently in active production status with ROHS3 compliance, providing long-term availability and regulatory alignment. The core material differs (Alumina vs. Ceramic), but both configurations deliver the specified electrical performance. Q factor is slightly lower (35 @ 250MHz vs. 40 @ 200MHz), representing a minor performance variation within acceptable engineering tolerances.

CI160808-56NJ is classified as a similar substitute with significant electrical limitations. The current rating is reduced to 300 mA (50% of the original specification), and DC resistance increases to 1Ohm maximum (3.2× higher than the original). The self-resonant frequency is substantially lower at 750 MHz compared to 1.9 GHz. This part is marked "Not For New Designs," indicating limited future support. CI160808-56NJ is suitable only for applications where the reduced current rating and higher DC resistance are acceptable.

For new designs and ongoing production, CW160808-56NJ is the recommended selection based on active product status, full electrical equivalence, and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can CW160808-56NJ directly replace PM0603-56NJ in existing designs?

A: Yes. CW160808-56NJ maintains identical inductance (56 nH ±5%), current rating (600 mA), DC resistance (310mOhm), package footprint (0603/1608 Metric), and operating temperature range (-40°C to 125°C). The core material change from Ceramic to Alumina does not affect electrical performance for this application. PCB layout and assembly processes remain unchanged.

Q: What are the limitations of CI160808-56NJ as a substitute?

A: CI160808-56NJ has two critical limitations: current rating is reduced to 300 mA (insufficient for 600 mA applications), and DC resistance increases to 1Ohm maximum (3.2× higher than specified). The self-resonant frequency is also lower at 750 MHz. This part is suitable only for circuits designed for lower current levels and higher DC resistance tolerance. The "Not For New Designs" status indicates limited future availability.

Q: Are there package compatibility concerns between these parts?

A: CW160808-56NJ maintains identical package dimensions (0.065" L x 0.041" W, 1.65mm x 1.05mm) and height (0.047" / 1.20mm) as PM0603-56NJ. CI160808-56NJ has slightly different dimensions (0.063" L x 0.031" W, 1.60mm x 0.80mm) and lower height (0.037" / 0.95mm). For standard 0603 footprints, CW160808-56NJ is the preferred choice. CI160808-56NJ may fit the same footprint but requires verification of clearance constraints in compact layouts.

Q: What is the impact of RoHS compliance differences?

A: PM0603-56NJ is RoHS non-compliant, while both CW160808-56NJ and CI160808-56NJ are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, CW160808-56NJ or CI160808-56NJ must be used. Material composition changes ensure compliance without affecting electrical performance.

Q: How do Q factor differences affect circuit performance?

A: PM0603-56NJ has Q of 40 @ 200MHz; CW160808-56NJ has Q of 35 @ 250MHz. The Q factor difference of approximately 12.5% is minor and typically acceptable in RF and high-frequency applications. CI160808-56NJ has significantly lower Q (10 @ 100MHz), which may impact performance in high-frequency circuits requiring high selectivity.