PM54-181K Equivalent & Substitute Parts

Part Overview

The PM54-181K is a 180 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 380 mA with 1.38Ohm DC resistance. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across -30°C to 100°C and is mounted as a surface mount nonstandard package component.

Key Parameters

Parameter	Value
Inductance	180 µH
Inductance Tolerance	±10%
Current Rating	380 mA
DC Resistance (DCR)	1.38Ohm
Core Material	Ferrite
Shielding	Unshielded
Mounting Type	Surface Mount
Package Type	Nonstandard
Size	0.228" L x 0.228" W (5.80mm x 5.80mm)
Height	0.189" (4.80mm)
Frequency - Self Resonant	6MHz
Operating Temperature	-30°C ~ 100°C

Substitute Part Grouping Explanation

Substitution eligibility for the PM54-181K is determined by the following critical parameters:

Inductance Value: 180 µH (exact match required)
Current Rating: Minimum 380 mA
DC Resistance: Maximum 1.38Ohm
Core Type: Ferrite drum core, unshielded
Mounting: Surface mount, nonstandard package
Physical Dimensions: 5.80mm x 5.80mm footprint with 4.80mm maximum height
Frequency Characteristics: Self-resonant frequency at or near 6MHz

Substitute parts are grouped into two categories: direct equivalents (matching all electrical and mechanical specifications) and similar alternatives (meeting core electrical requirements with minor parameter variations).

Parameter Comparison

Parameter	PM54-181K	PM54-181K-RC	SDR0604-181KL	CR54NP-181KC	PD54R-184K
Manufacturer	Bourns Inc.	Bourns Inc.	Bourns Inc.	Sumida America Components Inc.	API Delevan Inc.
Inductance	180 µH	180 µH	180 µH	180 µH	180 µH
Inductance Tolerance	±10%	±10%	±10%	±20%	±10%
Current Rating (mA)	380	380	380	380	370
DC Resistance (Ohm)	1.38	1.38	1.38 Max	1.38 Max	1.33 Max
Current - Saturation (mA)	-	500	500	-	370
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded
Frequency - Self Resonant (MHz)	6	6	6	6.42	-
Operating Temperature Range	-30°C ~ 100°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 100°C	-55°C ~ 125°C
Size (mm)	5.80 x 5.80	5.80 x 5.80	5.80 x 5.80	5.80 x 5.30	5.70 x 5.11
Height - Seated Max (mm)	4.80	4.80	4.80	4.85	4.50
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	-	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Direct Equivalents (Preferred for Substitution)

PM54-181K-RC and SDR0604-181KL are direct functional equivalents to the obsolete PM54-181K. Both parts maintain identical inductance, current rating, and DC resistance specifications. PM54-181K-RC is the direct Bourns replacement within the same PM54 series. SDR0604-181KL offers the same electrical performance under the SDR0604 series designation. Both are ROHS3 compliant and active products with extended operating temperature ranges (-40°C to 125°C), providing improved environmental performance over the original part.

Similar Alternatives (Secondary Options)

CR54NP-181KC (Sumida America Components Inc.) meets core electrical requirements with identical inductance, current rating, and DC resistance. The inductance tolerance is ±20% compared to ±10% for the primary part. Physical dimensions vary slightly (5.80mm x 5.30mm vs. 5.80mm x 5.80mm), and self-resonant frequency is 6.42MHz. This part is ROHS3 compliant and active.

PD54R-184K (API Delevan Inc.) provides an alternative with 180 µH inductance and ±10% tolerance. Current rating is 370 mA (10 mA lower than the original 380 mA specification) and DC resistance is 1.33Ohm maximum. Physical dimensions are 5.70mm x 5.11mm with 4.50mm height. This part offers the widest operating temperature range (-55°C to 125°C) and is ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can PM54-181K-RC directly replace the obsolete PM54-181K?

A: Yes. PM54-181K-RC is the active equivalent from Bourns Inc. with identical electrical specifications (180 µH, 380 mA, 1.38Ohm DCR) and physical dimensions (5.80mm x 5.80mm, 4.80mm height). The primary difference is product status (active vs. obsolete) and improved RoHS3 compliance.

Q: What is the difference between PM54-181K-RC and SDR0604-181KL?

A: Both are Bourns products with identical electrical and physical specifications. PM54-181K-RC belongs to the PM54 series, while SDR0604-181KL is from the SDR0604 series. Selection depends on design documentation and procurement availability. Both are ROHS3 compliant and active.

Q: Can I use CR54NP-181KC as a substitute?

A: CR54NP-181KC meets the core electrical requirements (180 µH, 380 mA, 1.38Ohm maximum DCR). The inductance tolerance is ±20% instead of ±10%, and physical dimensions vary slightly (5.80mm x 5.30mm). This part is suitable if tolerance and dimensional variations are acceptable for your application.

Q: Is PD54R-184K compatible with the original PM54-181K?

A: PD54R-184K provides 180 µH inductance with ±10% tolerance and meets DC resistance specifications (1.33Ohm maximum). The current rating is 370 mA, which is 10 mA below the original 380 mA specification. This part is suitable only if the lower current rating does not exceed your circuit requirements.

Q: What packaging is available for substitute parts?

A: PM54-181K-RC, SDR0604-181KL, CR54NP-181KC, and PD54R-184K are all available in Tape & Reel (TR) packaging for automated assembly. The original PM54-181K packaging information is not specified.

Q: Are all substitute parts RoHS compliant?

A: Yes. PM54-181K-RC, SDR0604-181KL, CR54NP-181KC, and PD54R-184K are all ROHS3 compliant. The original PM54-181K is RoHS non-compliant, making these substitutes necessary for RoHS-regulated applications.

Q: Which substitute offers the best temperature performance?

A: PD54R-184K provides the widest operating temperature range (-55°C to 125°C). PM54-181K-RC and SDR0604-181KL both operate from -40°C to 125°C. The original PM54-181K operates from -30°C to 100°C.

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