PM42S-151 Equivalent & Substitute Parts Reference

Part Overview

The PM42S-151 is a 150 µH shielded drum core, wirewound inductor rated for 150 mA with a maximum DC resistance of 2.67Ohm, manufactured by Bourns Inc. This component is classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing design requirements and production continuity. The PM42S-151 features surface mount packaging in a nonstandard case size of 4.80mm x 4.80mm with a seated height of 2.00mm, operating across a temperature range of -30°C to 100°C.

Key Parameters

Parameter	Value
Inductance	150 µH
Current Rating	150 mA
DC Resistance (DCR)	2.67Ohm Max
Tolerance	±30%
Core Material	Ferrite
Shielding	Shielded
Mounting Type	Surface Mount
Operating Temperature	-30°C ~ 100°C
Size / Dimension	4.80mm x 4.80mm
Height - Seated (Max)	2.00mm
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the PM42S-151 are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Inductance value: 150 µH (exact match required)
Core type: Ferrite, shielded drum core, wirewound construction
Mounting type: Surface mount
Physical footprint: 4.80mm x 4.80mm base dimensions
Tolerance: ±30%

Secondary Compatibility Parameters:

Current rating: Must meet or exceed 150 mA minimum requirement
DC resistance: Should remain within acceptable circuit performance limits
Operating temperature range: Must support application requirements
Moisture sensitivity level: MSL 1 (Unlimited) for both main and substitute parts

The substitute parts SRR4018-151Y and SRR4011-151YL maintain the core inductance specification and physical footprint while offering enhanced current ratings and active product status. Both substitutes are manufactured by Bourns Inc. and feature improved thermal and compliance characteristics compared to the obsolete PM42S-151.

Parameter Comparison

Parameter	PM42S-151	SRR4018-151Y	SRR4011-151YL
Inductance	150 µH	150 µH	150 µH
Current Rating (Amps)	150 mA	280 mA	250 mA
DC Resistance (DCR)	2.67Ohm Max	2.6Ohm Max	3.8Ohm Max
Tolerance	±30%	±30%	±30%
Core Material	Ferrite	Ferrite	Ferrite
Shielding	Shielded	Shielded	Shielded
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-30°C ~ 100°C	-40°C ~ 125°C	-40°C ~ 125°C
Size / Dimension	4.80mm x 4.80mm	4.80mm x 4.80mm	4.80mm x 4.80mm
Height - Seated (Max)	2.00mm	2.00mm	1.30mm
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Nonstandard	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

SRR4018-151Y is the primary substitute for PM42S-151 applications. This part maintains equivalent DC resistance (2.6Ohm Max versus 2.67Ohm Max), provides enhanced current capacity (280 mA versus 150 mA), and is ROHS3 compliant. The SRR4018-151Y operates across an extended temperature range (-40°C to 125°C) and is actively manufactured, ensuring long-term availability. Packaging is provided in standard Tape & Reel format, improving supply chain efficiency.

SRR4011-151YL serves as an alternative substitute where height constraints are critical. This part offers a reduced seated height of 1.30mm compared to 2.00mm, supporting applications with limited vertical clearance. The SRR4011-151YL provides 250 mA current capacity and ROHS3 compliance. The increased DC resistance (3.8Ohm Max) must be evaluated against circuit power dissipation requirements.

Both substitute parts are active products with ROHS3 compliance, addressing regulatory requirements that the obsolete PM42S-151 does not meet. Selection between SRR4018-151Y and SRR4011-151YL depends on specific application constraints regarding DC resistance tolerance, current headroom, and physical height limitations.

Frequently Asked Questions (FAQ)

Q: Can SRR4018-151Y directly replace PM42S-151 in existing designs?

A: Yes, for applications where the current requirement does not exceed 150 mA. The SRR4018-151Y maintains the same inductance value (150 µH), tolerance (±30%), core material (ferrite), shielding, and base footprint (4.80mm x 4.80mm). The DC resistance is nearly identical (2.6Ohm Max versus 2.67Ohm Max), ensuring equivalent circuit performance. The extended operating temperature range (-40°C to 125°C) and ROHS3 compliance provide additional benefits.

Q: What is the impact of increased DC resistance in SRR4011-151YL?

A: The SRR4011-151YL has a maximum DC resistance of 3.8Ohm compared to 2.67Ohm in PM42S-151. This 0.43% increase in resistance will result in proportionally higher power dissipation at rated current. For a 150 mA load, the additional dissipation is approximately 0.11 mW. Circuit designs sensitive to inductor losses must account for this difference.

Q: Are the substitute parts compatible with the original PCB layout?

A: The SRR4018-151Y maintains identical footprint dimensions (4.80mm x 4.80mm) and seated height (2.00mm) as PM42S-151, ensuring direct PCB compatibility. The SRR4011-151YL has the same footprint but a reduced seated height of 1.30mm, which may require PCB layout verification to confirm clearance with adjacent components.

Q: What packaging format is provided for substitute parts?

A: Both SRR4018-151Y and SRR4011-151YL are supplied in Tape & Reel (TR) format, which is standard for automated assembly processes. The original PM42S-151 used nonstandard packaging, so the transition to standard Tape & Reel improves supply chain efficiency and reduces handling costs.

Q: Do the substitute parts meet current regulatory requirements?

A: Yes. Both SRR4018-151Y and SRR4011-151YL are ROHS3 compliant, whereas PM42S-151 is RoHS non-compliant. This compliance is essential for applications subject to RoHS directives in the EU and equivalent regulations in other markets.

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