PM75-180K-RC Equivalent & Substitute Parts

Part Overview

The PM75-180K-RC is a 18 µH unshielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1.6 A continuous current with a maximum DC resistance of 100 mOhm. This surface mount component is designed for applications requiring fixed inductance in compact form factors. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this product category.

Key Parameters

Parameter	Value	Unit
Inductance	18	µH
Current Rating	1.6	A
DC Resistance (Max)	100	mOhm
Current - Saturation	2.6	A
Operating Temperature Range	-40 to 125	°C
Mounting Type	Surface Mount	—
Core Material	Ferrite	—
Shielding	Unshielded	—

Substitute Part Grouping Explanation

Substitution eligibility for the PM75-180K-RC is determined by the following critical parameters:

Inductance Value: 18 µH (exact match required)
Current Rating: 1.6 A minimum (saturation current 2.6 A minimum)
DC Resistance: 100 mOhm maximum
Core Type: Ferrite drum core, unshielded
Mounting: Surface mount configuration
Operating Temperature: -40°C to 125°C minimum range
Compliance: ROHS3 compliant, MSL 1 rating

The SDR0805-180ML meets all critical electrical parameters and mechanical requirements. Tolerance differences do not preclude substitution when the application circuit design accommodates the specified tolerance range.

Parameter Comparison

Parameter	PM75-180K-RC	SDR0805-180ML	Match Status
Inductance	18 µH	18 µH	Exact
Inductance Tolerance	±10%	±20%	Different
Current Rating	1.6 A	1.6 A	Exact
Current - Saturation	2.6 A	2.6 A	Exact
DC Resistance (Max)	100 mOhm	100 mOhm	Exact
Q @ Frequency	20 @ 2.52 MHz	20 @ 2.52 MHz	Exact
Frequency - Self Resonant	15 MHz	15 MHz	Exact
Operating Temperature	-40 to 125°C	-40 to 125°C	Exact
Core Material	Ferrite	Ferrite	Exact
Shielding	Unshielded	Unshielded	Exact
Mounting Type	Surface Mount	Surface Mount	Exact
Size / Dimension	0.307" Dia (7.80 mm)	0.307" L x 0.307" W (7.80 mm x 7.80 mm)	Compatible
Height - Seated (Max)	0.209" (5.30 mm)	0.209" (5.30 mm)	Exact
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Exact
MSL Rating	1 (Unlimited)	1 (Unlimited)	Exact
REACH Status	REACH Unaffected	REACH Unaffected	Exact

Engineering Selection Recommendations

Both PM75-180K-RC and SDR0805-180ML are active production components from Bourns Inc. with identical ROHS3 compliance and REACH unaffected status. The parts are electrically and mechanically compatible for direct substitution in surface mount applications requiring 18 µH inductance at 1.6 A rating.

The primary difference is inductance tolerance: PM75-180K-RC specifies ±10% while SDR0805-180ML specifies ±20%. Selection between these parts depends on circuit tolerance requirements. Both parts maintain identical DC resistance, saturation current, Q factor, self-resonant frequency, and thermal operating range.

Physical dimensions are compatible for PCB layout purposes. Both parts are packaged in Tape & Reel format and carry unlimited moisture sensitivity rating, eliminating bake-out requirements for standard storage and handling conditions.

Frequently Asked Questions (FAQ)

Q: Can SDR0805-180ML replace PM75-180K-RC in existing designs?

A: Yes, provided the circuit design accommodates the ±20% inductance tolerance of the SDR0805-180ML. If the original design requires ±10% tolerance, the PM75-180K-RC must be retained.

Q: Are the physical dimensions identical between these parts?

A: The parts are mechanically compatible. PM75-180K-RC specifies 0.307" diameter, while SDR0805-180ML specifies 0.307" length by 0.307" width. Both have identical 0.209" maximum seated height and are suitable for the same PCB footprints.

Q: Do these parts have different compliance certifications?

A: No. Both parts carry identical ROHS3 compliance, REACH unaffected status, and MSL 1 (unlimited) moisture sensitivity rating.

Q: What is the difference in electrical performance between these inductors?

A: Electrical performance is identical across all measured parameters: 18 µH inductance, 1.6 A current rating, 100 mOhm maximum DC resistance, 2.6 A saturation current, 20 Q factor at 2.52 MHz, and 15 MHz self-resonant frequency. The tolerance specification differs only.

Q: Are both parts available in the same packaging format?

A: Yes. Both PM75-180K-RC and SDR0805-180ML are supplied in Tape & Reel (TR) packaging for automated assembly processes.

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