PM628S-330-RC Equivalent & Substitute Parts

Part Overview

The PM628S-330-RC is a 33 µH shielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1.15 A continuous current with a maximum DC resistance of 155 mOhm. This surface mount component is designed for applications requiring controlled inductance with ferrite core shielding in compact nonstandard packaging. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating, making it suitable for industrial and commercial electronic assemblies operating across the -40°C to 125°C temperature range.

Alternative models become necessary when addressing supply chain constraints, inventory availability, or when design specifications permit equivalent performance characteristics across different product series within the same manufacturer portfolio.

Key Parameters

Parameter	Value
Inductance	33 µH
Inductance Tolerance	±30%
Current Rating	1.15 A
Current - Saturation (Isat)	920 mA
DC Resistance (DCR)	155 mOhm Max
Core Material	Ferrite
Shielding	Shielded
Q Factor @ Frequency	10 @ 2.52 MHz
Self Resonant Frequency	14 MHz
Operating Temperature Range	-40°C to 125°C
Mounting Type	Surface Mount
Package Dimensions	6.80 mm × 6.80 mm × 3.00 mm (Max Height)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

The SRR6028-330Y qualifies as a direct substitute for the PM628S-330-RC based on the following critical parameters:

Matching Electrical Specifications:

Inductance value: 33 µH with ±30% tolerance
Current rating: 1.15 A continuous
Saturation current: 920 mA
DC resistance: 155 mOhm maximum
Q factor: 10 @ 2.52 MHz
Operating temperature: -40°C to 125°C

Matching Mechanical Specifications:

Core type: Ferrite drum core, wirewound
Shielding: Shielded construction
Mounting: Surface mount
Package dimensions: 6.80 mm × 6.80 mm × 3.00 mm maximum height
Packaging format: Tape & Reel

Compliance Alignment:

RoHS3 compliant
Moisture sensitivity level 1 (unlimited)
REACH unaffected status

The SRR6028-330Y operates at a higher self-resonant frequency (18 MHz versus 14 MHz), which represents an improvement in high-frequency performance characteristics while maintaining all other electrical and mechanical parameters within specification.

Parameter Comparison

Parameter	PM628S-330-RC	SRR6028-330Y	Match Status
Inductance	33 µH	33 µH	Identical
Inductance Tolerance	±30%	±30%	Identical
Current Rating (Amps)	1.15 A	1.15 A	Identical
Current - Saturation (Isat)	920 mA	920 mA	Identical
DC Resistance (DCR)	155 mOhm Max	155 mOhm Max	Identical
Core Material	Ferrite	Ferrite	Identical
Shielding	Shielded	Shielded	Identical
Q @ Frequency	10 @ 2.52 MHz	10 @ 2.52 MHz	Identical
Frequency - Self Resonant	14 MHz	18 MHz	SRR6028 Higher
Operating Temperature	-40°C to 125°C	-40°C to 125°C	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Package Dimensions	6.80 mm × 6.80 mm × 3.00 mm	6.80 mm × 6.80 mm × 3.00 mm	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Identical

Engineering Selection Recommendations

Both PM628S-330-RC and SRR6028-330Y are active production components with full RoHS3 compliance and REACH unaffected status, qualifying them for equivalent use in applications requiring 33 µH inductance at 1.15 A rating.

Selection between these parts should be based on:

Inventory Availability: The SRR6028-330Y maintains higher stock levels (5600 pcs) compared to PM628S-330-RC (921 pcs), making it the preferred choice for high-volume procurement or extended lead time mitigation.

High-Frequency Performance: The SRR6028-330Y self-resonant frequency of 18 MHz provides superior performance margin in applications operating near or above 14 MHz, while maintaining identical electrical characteristics at the specified test frequency of 100 kHz.

Compliance Requirements: Both parts satisfy identical regulatory requirements for RoHS3 and REACH compliance, with matching moisture sensitivity ratings suitable for standard PCB assembly and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can SRR6028-330Y be used as a direct replacement for PM628S-330-RC in existing designs?

A: Yes. Both parts share identical inductance (33 µH ±30%), current rating (1.15 A), DC resistance (155 mOhm max), core material (ferrite), shielding, operating temperature range (-40°C to 125°C), and package dimensions (6.80 mm × 6.80 mm × 3.00 mm). No circuit redesign is required.

Q: What is the difference in self-resonant frequency between these parts?

A: The PM628S-330-RC has a self-resonant frequency of 14 MHz, while the SRR6028-330Y operates at 18 MHz. This difference does not affect performance at the specified inductance test frequency of 100 kHz. The higher self-resonant frequency of the SRR6028-330Y provides additional margin in high-frequency applications.

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

A: Yes. Both PM628S-330-RC and SRR6028-330Y are supplied in Tape & Reel (TR) packaging suitable for automated assembly processes.

Q: Do these parts have identical moisture sensitivity ratings?

A: Yes. Both parts carry Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture control requirements during storage or handling.

Q: Which part should be selected for new designs?

A: Selection should be based on supply chain requirements and application frequency performance needs. The SRR6028-330Y offers higher inventory availability and superior high-frequency characteristics, while the PM628S-330-RC remains a valid alternative when specific series designation is required.

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