PM43-180M Equivalent & Substitute Parts

Part Overview

The PM43-180M is an 18 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 740 mA with a DC resistance of 338mOhm. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The part operates across a temperature range of -40°C to 100°C and is not RoHS compliant, which may impact applications requiring environmental compliance.

Key Parameters

Parameter	Value
Inductance	18 µH
Tolerance	±20%
Current Rating	740 mA
DC Resistance (DCR)	338mOhm
Core Material	Ferrite
Shielding	Unshielded
Operating Temperature	-40°C ~ 100°C
Mounting Type	Surface Mount
Physical Dimensions	0.177" L x 0.157" W x 0.138" H (4.50mm x 4.00mm x 4.60mm)
Inductance Test Frequency	2.52 MHz

Substitute Part Grouping Explanation

Substitute parts for the PM43-180M are qualified based on the following critical parameters:

Inductance Value: Must be 18 µH with ±20% tolerance
Current Rating: Must support minimum 740 mA continuous current
DC Resistance: Must not exceed 338mOhm maximum
Core Material: Ferrite unshielded construction
Physical Footprint: Identical 4.50mm x 4.00mm x 4.60mm dimensions for PCB compatibility
Mounting Type: Surface mount configuration
Operating Temperature Range: Must cover -40°C to 100°C minimum

Two substitute categories are identified: direct replacements with enhanced specifications (SDR0403-180ML) and equivalent alternatives with matching electrical characteristics (CD43NP-180MC, CR43NP-180MC).

Parameter Comparison

Parameter	PM43-180M (Main)	SDR0403-180ML	CD43NP-180MC	CR43NP-180MC
Manufacturer	Bourns Inc.	Bourns Inc.	Sumida America Components Inc.	Sumida America Components Inc.
Inductance	18 µH	18 µH	18 µH	18 µH
Tolerance	±20%	±20%	±20%	±20%
Current Rating	740 mA	840 mA	740 mA	740 mA
DC Resistance (DCR)	338mOhm	340mOhm Max	338mOhm Max	338mOhm Max
Core Material	Ferrite	Ferrite	Ferrite	Ferrite
Shielding	Unshielded	Unshielded	Unshielded	Unshielded
Operating Temperature	-40°C ~ 100°C	-40°C ~ 125°C	-40°C ~ 100°C	-40°C ~ 100°C
Physical Dimensions	4.50mm x 4.00mm x 4.60mm	4.50mm x 4.00mm x 4.60mm	4.50mm x 4.00mm x 4.60mm	4.50mm x 4.00mm x 4.60mm
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Bulk	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

SDR0403-180ML is the primary substitute for PM43-180M. This Bourns Inc. part is active in production, ROHS3 compliant, and offers enhanced specifications including 840 mA current rating and extended operating temperature to 125°C. The SDR0403-180ML maintains identical physical dimensions and inductance characteristics while providing improved thermal performance and regulatory compliance.

CD43NP-180MC and CR43NP-180MC are equivalent alternatives manufactured by Sumida America Components Inc. Both parts match the original electrical specifications exactly (18 µH, 740 mA, 338mOhm DCR) and are ROHS3 compliant. These options are suitable for applications where the original performance envelope is sufficient and alternative sourcing is required.

All three substitute parts are available in tape and reel packaging, supporting automated assembly processes. Selection between substitutes should consider supply chain availability, cost structure, and thermal margin requirements for the specific application.

Frequently Asked Questions (FAQ)

Q: Can SDR0403-180ML directly replace PM43-180M? A: Yes. The SDR0403-180ML maintains identical inductance (18 µH), tolerance (±20%), physical dimensions (4.50mm x 4.00mm x 4.60mm), and DC resistance specification (340mOhm max). The higher current rating (840 mA vs 740 mA) and extended temperature range (-40°C to 125°C) provide additional design margin.

Q: What is the difference between the Sumida parts (CD43NP-180MC and CR43NP-180MC)? A: Both Sumida alternatives provide identical electrical performance to the original PM43-180M. CD43NP-180MC and CR43NP-180MC differ in internal construction type but deliver the same 18 µH inductance, 740 mA current rating, and 338mOhm DCR. Both are ROHS3 compliant and available in tape and reel packaging.

Q: Are there temperature range considerations when substituting? A: The original PM43-180M operates from -40°C to 100°C. SDR0403-180ML extends this to -40°C to 125°C, providing additional thermal headroom. CD43NP-180MC and CR43NP-180MC maintain the original -40°C to 100°C range. Applications requiring operation above 100°C should specify SDR0403-180ML.

Q: Does RoHS compliance affect substitution? A: The PM43-180M is RoHS non-compliant. All three substitute parts (SDR0403-180ML, CD43NP-180MC, CR43NP-180MC) are ROHS3 compliant. Applications subject to RoHS regulations must use one of these compliant alternatives.

Q: Are the physical dimensions identical across all parts? A: Yes. All substitute parts maintain the same 4.50mm x 4.00mm x 4.60mm footprint, ensuring PCB compatibility without layout modifications.

Q: What packaging formats are available for substitutes? A: All substitute parts are supplied in tape and reel (TR) packaging, suitable for automated pick-and-place assembly. The original PM43-180M was supplied in bulk packaging.

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