PM428S-4R7-RC Equivalent & Substitute Parts

Part Overview

The PM428S-4R7-RC is a 4.7 µH shielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1.55 A with a maximum DC resistance of 70mOhm. This surface mount component is designed for applications requiring controlled inductance with ferrite core shielding and operates across the temperature range of -40°C to 125°C. The part maintains Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances.

Key Parameters

Parameter	Value
Inductance	4.7 µH
Tolerance	±30%
Current Rating	1.55 A
Current - Saturation (Isat)	1.3 A
DC Resistance (DCR)	70mOhm Max
Core Material	Ferrite
Shielding	Shielded
Q @ Frequency	8.12 @ 7.96MHz
Frequency - Self Resonant	55MHz
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Size / Dimension	0.189" L x 0.189" W (4.80mm x 4.80mm)
Height - Seated (Max)	0.118" (3.00mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the PM428S-4R7-RC is determined by strict equivalence across the following critical parameters:

Inductance value: 4.7 µH with ±30% tolerance
Current rating: 1.55 A minimum
Saturation current (Isat): 1.3 A minimum
DC resistance: 70mOhm maximum
Core type: Ferrite shielded drum core
Mounting: Surface mount configuration
Physical dimensions: 4.80mm x 4.80mm footprint with 3.00mm maximum height
Operating temperature range: -40°C to 125°C
Regulatory compliance: ROHS3 compliant

The SRR4028-4R7Y meets all specified electrical and mechanical parameters, maintaining identical inductance, current ratings, DC resistance, and thermal operating range. Both components utilize ferrite shielded drum core construction with equivalent Q factor and self-resonant frequency characteristics.

Parameter Comparison

Parameter	PM428S-4R7-RC	SRR4028-4R7Y	Match Status
Inductance	4.7 µH	4.7 µH	Equivalent
Tolerance	±30%	±30%	Equivalent
Current Rating (Amps)	1.55 A	1.55 A	Equivalent
Current - Saturation (Isat)	1.3 A	1.3 A	Equivalent
DC Resistance (DCR)	70mOhm Max	70mOhm Max	Equivalent
Core Material	Ferrite	Ferrite	Equivalent
Shielding	Shielded	Shielded	Equivalent
Q @ Frequency	8.12 @ 7.96MHz	8.12 @ 7.96MHz	Equivalent
Frequency - Self Resonant	55MHz	55MHz	Equivalent
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Size / Dimension	0.189" L x 0.189" W (4.80mm x 4.80mm)	0.189" L x 0.189" W (4.80mm x 4.80mm)	Equivalent
Height - Seated (Max)	0.118" (3.00mm)	0.118" (3.00mm)	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

Both PM428S-4R7-RC and SRR4028-4R7Y are Active status products manufactured by Bourns Inc. with full ROHS3 compliance and REACH unaffected status. Selection between these components is based on availability and supply chain requirements rather than electrical or mechanical differentiation. The SRR4028-4R7Y series demonstrates higher inventory availability (15,586 pcs vs. 712 pcs), which may influence procurement decisions for high-volume applications. Both components satisfy identical regulatory and compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can SRR4028-4R7Y be used as a direct replacement for PM428S-4R7-RC?

A: Yes. Both components share identical electrical specifications (4.7 µH inductance, 1.55 A current rating, 70mOhm DCR), core material (ferrite shielded), and physical dimensions (4.80mm x 4.80mm footprint, 3.00mm height). No circuit modifications are required.

Q: Are there differences in package designation between these parts?

A: The PM428S-4R7-RC uses a Nonstandard package designation, while the SRR4028-4R7Y uses the 1919 (4848 Metric) package designation. Despite different nomenclature, both maintain identical physical dimensions and surface mount compatibility.

Q: What determines substitution eligibility for this inductor category?

A: Substitution is determined by equivalence in inductance value, current rating, saturation current, DC resistance, core material, shielding type, physical dimensions, and operating temperature range. All these parameters must match within specified tolerances.

Q: Are both parts suitable for the same operating temperature applications?

A: Yes. Both PM428S-4R7-RC and SRR4028-4R7Y operate across -40°C to 125°C, making them interchangeable for applications within this thermal range.

Q: What is the significance of the ±30% inductance tolerance?

A: The ±30% tolerance defines the acceptable inductance variation from the nominal 4.7 µH value. Both substitute parts maintain this identical tolerance specification, ensuring equivalent circuit performance characteristics.

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