PM0805-56NK Equivalent & Substitute Parts

Part Overview

The PM0805-56NK is a 56 nH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 500 mA with a maximum DC resistance of 340mOhm in a 0805 (2012 Metric) surface mount package. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value
Inductance	56 nH
Tolerance	±10%
Current Rating	500 mA
DC Resistance (DCR)	340mOhm Max
Package / Case	0805 (2012 Metric)
Mounting Type	Surface Mount
Operating Temperature	-55°C ~ 125°C
Shielding	Unshielded
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the PM0805-56NK is determined by the following critical parameters: inductance value (56 nH), current rating capability, DC resistance, package form factor, and mounting compatibility. Substitute parts are grouped into two categories based on these criteria:

Category 1: Direct Package Compatibility (0805 / 2012 Metric)

PM0805-56NK-RC: Active status direct replacement with improved DC resistance (250mOhm vs 340mOhm) and enhanced core material (Alumina)
CW201212-56NJ: Active status alternative with tighter tolerance (±5% vs ±10%) and ceramic core

Category 2: Enhanced Performance Alternative (1008 / 2520 Metric)

CW252016-56NG and CW252016-56NJ: Larger package format with higher current rating (600 mA vs 500 mA) and lower DC resistance (180mOhm Max)

Parameter Comparison

Parameter	PM0805-56NK (Main)	PM0805-56NK-RC	CW201212-56NJ	CW252016-56NG	CW252016-56NJ
Inductance	56 nH	56 nH	56 nH	56 nH	56 nH
Tolerance	±10%	±10%	±5%	±2%	±5%
Current Rating (Amps)	500 mA	500 mA	500 mA	600 mA	600 mA
DC Resistance (DCR)	340mOhm Max	250mOhm	250mOhm	180mOhm Max	180mOhm Max
Q @ Freq	60 @ 500MHz	60 @ 500MHz	60 @ 500MHz	60 @ 350MHz	60 @ 350MHz
Frequency - Self Resonant	1.55GHz	1.6GHz	1.6GHz	1.3GHz	1.3GHz
Operating Temperature	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	0805 (2012 Metric)	0805 (2012 Metric)	0805 (2012 Metric)	1008 (2520 Metric)	1008 (2520 Metric)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Package Replacement (0805 / 2012 Metric):

PM0805-56NK-RC is the primary active substitute, offering identical package dimensions and current rating with superior DC resistance performance (250mOhm vs 340mOhm) and ROHS3 compliance. Operating temperature range is reduced to -40°C ~ 125°C.

CW201212-56NJ provides an alternative within the same package footprint with tighter inductance tolerance (±5%) and ROHS3 compliance, also with -40°C ~ 125°C operating range.

For Enhanced Performance Applications (1008 / 2520 Metric):

CW252016-56NG and CW252016-56NJ are suitable where board space permits a larger footprint. Both offer increased current capacity (600 mA) and significantly reduced DC resistance (180mOhm Max), with ROHS3 compliance. CW252016-56NG provides ±2% tolerance; CW252016-56NJ provides ±5% tolerance.

All substitute parts maintain the 56 nH inductance specification and unshielded drum core wirewound construction. Selection should account for operating temperature requirements, as the main part supports -55°C operation while all substitutes are limited to -40°C minimum.

Frequently Asked Questions (FAQ)

Q: Can PM0805-56NK-RC be used as a direct drop-in replacement for PM0805-56NK?

A: Yes, PM0805-56NK-RC maintains identical package dimensions (0805 / 2012 Metric), inductance (56 nH), current rating (500 mA), and mounting type. The primary differences are improved DC resistance (250mOhm vs 340mOhm), core material change (Alumina vs Ceramic), and ROHS3 compliance. Operating temperature range is reduced from -55°C ~ 125°C to -40°C ~ 125°C.

Q: What is the difference between the 0805 and 1008 package options?

A: The 0805 (2012 Metric) package measures 0.083" L x 0.059" W (2.10mm x 1.50mm) with 0.059" seated height. The 1008 (2520 Metric) package measures 0.098" L x 0.079" W (2.50mm x 2.00mm) with 0.071" seated height. The larger 1008 package accommodates higher current ratings (600 mA) and lower DC resistance (180mOhm Max). Selection depends on available PCB space and thermal management requirements.

Q: How do tolerance specifications affect circuit performance?

A: PM0805-56NK specifies ±10% inductance tolerance. CW201212-56NJ offers ±5% tolerance, and CW252016-56NG offers ±2% tolerance. Tighter tolerances reduce inductance variation across production batches, beneficial for applications requiring precise frequency response or impedance matching. Standard ±10% tolerance is acceptable for general filtering and impedance applications.

Q: Are all substitute parts RoHS compliant?

A: PM0805-56NK is RoHS non-compliant. All substitute parts (PM0805-56NK-RC, CW201212-56NJ, CW252016-56NG, and CW252016-56NJ) are ROHS3 compliant, meeting current environmental regulations for new designs and production.

Q: What is the impact of reduced operating temperature range?

A: PM0805-56NK operates from -55°C ~ 125°C. All substitute parts operate from -40°C ~ 125°C. Applications requiring operation below -40°C must retain the original PM0805-56NK or identify alternative components with extended low-temperature specifications.

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