PM75-221K Equivalent & Substitute Parts

Part Overview

The PM75-221K is a 220 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 490 mA with a maximum DC resistance of 960 mOhm. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part operates across a temperature range of -30°C to 100°C and is not RoHS compliant.

Key Parameters

Parameter	Value
Inductance	220 µH
Tolerance	±10%
Current Rating	490 mA
DC Resistance (DCR)	960 mOhm Max
Core Type	Ferrite, Unshielded Drum Core
Mounting Type	Surface Mount
Physical Dimensions	0.307" L x 0.307" W x 0.209" H (7.80mm x 7.80mm x 5.30mm)
Frequency - Self Resonant	5 MHz
Operating Temperature	-30°C ~ 100°C
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the PM75-221K is determined by strict equivalence across the following electrical and mechanical parameters:

Inductance value: 220 µH ±10%
Current rating: 490 mA minimum
DC resistance: 960 mOhm maximum
Core material and type: Ferrite, unshielded drum core
Mounting configuration: Surface mount
Physical footprint compatibility: 7.80mm diameter or equivalent L x W dimensions
Self-resonant frequency: 5 MHz or higher
Moisture sensitivity: MSL 1

Substitute parts must maintain these specifications to ensure functional and mechanical compatibility within the original circuit design.

Parameter Comparison

Parameter	PM75-221K (Main)	SDR0805-221KL (Direct)	CR75NP-221KC (Similar)
Manufacturer	Bourns Inc.	Bourns Inc.	Sumida America Components Inc.
Inductance	220 µH	220 µH	220 µH
Tolerance	±10%	±10%	±10%
Current Rating (Amps)	490 mA	490 mA	490 mA
DC Resistance (DCR)	960 mOhm Max	960 mOhm Max	960 mOhm Max
Core Type	Ferrite, Unshielded Drum Core	Ferrite, Unshielded Drum Core	Ferrite, Unshielded Drum Core
Shielding	Unshielded	Unshielded	Unshielded
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Self-Resonant Frequency	5 MHz	5 MHz	5.2 MHz
Operating Temperature	-30°C ~ 100°C	-40°C ~ 125°C	-40°C ~ 100°C
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	MSL 1	MSL 1	MSL 1
Packaging	Nonstandard	Tape & Reel (TR)	Tape & Reel (TR)
Physical Dimensions (L x W x H)	7.80mm x 7.80mm x 5.30mm	7.80mm Dia x 5.30mm	7.80mm x 7.00mm x 5.50mm

Engineering Selection Recommendations

The SDR0805-221KL represents a direct equivalent from the same manufacturer (Bourns Inc.) with active product status and ROHS3 compliance. This part maintains all critical electrical parameters while offering an extended operating temperature range (-40°C to 125°C) and improved regulatory compliance compared to the obsolete PM75-221K.

The CR75NP-221KC from Sumida America Components Inc. provides an alternative substitute with equivalent electrical specifications and ROHS3 compliance. Physical dimensions show minor variations in width (7.00mm vs. 7.80mm) and height (5.50mm vs. 5.30mm), which must be evaluated for PCB layout compatibility. This part maintains the required electrical performance across the specified operating temperature range.

Both substitute parts are actively manufactured and available in standard packaging formats, supporting long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can SDR0805-221KL be used as a direct replacement for PM75-221K?

A: Yes. The SDR0805-221KL meets all electrical specifications (220 µH inductance, 490 mA current rating, 960 mOhm DCR) and maintains the same core type and mounting configuration. Physical dimensions are compatible. The part is manufactured by the same supplier and is actively produced.

Q: What are the key differences between SDR0805-221KL and CR75NP-221KC?

A: Both parts meet the electrical requirements. SDR0805-221KL is from Bourns Inc. with a circular 7.80mm diameter footprint. CR75NP-221KC is from Sumida with rectangular dimensions of 7.80mm x 7.00mm and slightly greater height (5.50mm vs. 5.30mm). PCB layout compatibility must be confirmed for the CR75NP-221KC due to dimensional variations.

Q: Are there compliance differences between the substitute parts?

A: Both SDR0805-221KL and CR75NP-221KC are ROHS3 compliant, whereas the original PM75-221K is not RoHS compliant. Both substitutes are REACH unaffected and classified as EAR99 for export control purposes.

Q: What is the impact of the extended temperature range in SDR0805-221KL?

A: The SDR0805-221KL operates from -40°C to 125°C compared to the PM75-221K range of -30°C to 100°C. This extended range provides greater operational flexibility but does not affect substitution suitability for designs operating within the original temperature specification.

Q: How do the packaging formats differ?

A: The PM75-221K uses nonstandard packaging. Both substitutes are supplied in Tape & Reel (TR) format, which is standard for automated assembly processes and improves handling and storage consistency.

Q: Are there any saturation current differences to consider?

A: The SDR0805-221KL specifies a saturation current (Isat) of 800 mA, providing additional margin above the 490 mA rated current. The CR75NP-221KC does not specify saturation current in the available data. Both parts maintain the required 490 mA current rating.

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