PM125SH-151M Equivalent & Substitute Parts

Part Overview

The PM125SH-151M is a 150 µH shielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1 A continuous current with a maximum DC resistance of 230 mOhm. This component operates across the temperature range of -30°C to 100°C and is mounted as a surface mount device in a nonstandard 12.50mm × 12.50mm package.

The PM125SH-151M is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this inductor specification.

Key Parameters

Parameter	PM125SH-151M Value
Inductance	150 µH
Current Rating	1 A
DC Resistance (DCR)	230 mOhm Max
Tolerance	±20%
Shielding	Shielded
Core Type	Drum Core, Wirewound
Core Material	Ferrite
Operating Temperature	-30°C ~ 100°C
Mounting Type	Surface Mount
Package Dimensions	12.50mm × 12.50mm × 6.50mm (Max Height)
RoHS Status	Non-compliant

Substitute Part Grouping Explanation

Substitute parts for the PM125SH-151M are grouped based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Inductance value: 150 µH (exact match required)
Shielding configuration: Shielded (electromagnetic containment requirement)
Core type: Drum core wirewound (magnetic performance and form factor)
Mounting type: Surface mount (PCB integration requirement)

Secondary Compatibility Parameters:

Current rating: Minimum 1 A (equal or greater acceptable)
DC resistance: Maximum 230 mOhm (lower values acceptable; higher values require thermal analysis)
Operating temperature range: Must encompass or exceed -30°C to 100°C
Package footprint: 12.50mm × 12.50mm base dimension (mechanical fit requirement)

Parts meeting all primary criteria and maintaining secondary parameter compatibility are classified as direct substitutes. Parts matching primary criteria with minor secondary parameter variations are classified as similar substitutes, requiring application-specific validation.

Parameter Comparison

Part Number	Manufacturer	Inductance	Current Rating	DCR (Max)	Tolerance	Shielding	Temp Range	Package Dimensions	Product Status	RoHS Status
PM125SH-151M	Bourns Inc.	150 µH	1 A	230 mOhm	±20%	Shielded	-30°C ~ 100°C	12.50 × 12.50 × 6.50mm	Obsolete	Non-compliant
SRR1260-151K	Bourns Inc.	150 µH	1.55 A	260 mOhm	±10%	Shielded	-40°C ~ 125°C	12.50 × 12.50 × 6.50mm	Active	ROHS3 Compliant
CDRH125NP-151MC	Sumida America Components Inc.	150 µH	1 A	230 mOhm	±20%	Shielded	-40°C ~ 100°C	12.00 × 12.00 × 6.00mm	Active	ROHS3 Compliant
B82477G2154M000	EPCOS - TDK Electronics	150 µH	1 A	230 mOhm	±20%	Shielded	-55°C ~ 125°C	12.30 × 12.30 × 6.00mm	Active	ROHS3 Compliant
SRR1206-151KL	Bourns Inc.	150 µH	900 mA	320 mOhm	±10%	Shielded	-40°C ~ 125°C	12.70 × 12.70 × 6.50mm	Active	ROHS3 Compliant
SRR1205-151KL	Bourns Inc.	150 µH	800 mA	580 mOhm	±10%	Shielded	-40°C ~ 125°C	12.70 × 12.70 × 5.50mm	Active	ROHS3 Compliant
SRR1208-151KL	Bourns Inc.	150 µH	1.3 A	240 mOhm	±10%	Shielded	-40°C ~ 125°C	12.70 × 12.70 × 8.50mm	Active	ROHS3 Compliant
SRR1208-151YL	Bourns Inc.	150 µH	1.3 A	240 mOhm	±15%	Shielded	-40°C ~ 125°C	12.70 × 12.70 × 8.50mm	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

SRR1260-151K and CDRH125NP-151MC are direct substitutes for the PM125SH-151M. Both maintain the 150 µH inductance, shielded configuration, and surface mount form factor. SRR1260-151K provides enhanced current capacity (1.55 A versus 1 A) with improved temperature range (-40°C to 125°C) and active product status with ROHS3 compliance. CDRH125NP-151MC matches the original electrical specifications exactly while offering ROHS3 compliance and active availability.

B82477G2154M000 provides equivalent electrical performance with extended temperature range (-55°C to 125°C) and ROHS3 compliance. Minor package dimension variations (12.30mm × 12.30mm versus 12.50mm × 12.50mm) require PCB layout verification.

Similar Substitutes (Application-Dependent):

SRR1206-151KL, SRR1205-151KL, SRR1208-151KL, and SRR1208-151YL maintain the 150 µH inductance and shielded configuration but present variations in current rating, DC resistance, and package height. These parts are suitable where current capacity and thermal performance requirements align with the application. All offer ROHS3 compliance and active product status.

SRR1206-151KL (900 mA, 320 mOhm) and SRR1208-151KL (1.3 A, 240 mOhm) are preferred within this group due to current ratings closer to or exceeding the original 1 A specification and improved temperature ranges.

SRR1205-151KL presents reduced current capacity (800 mA) and elevated DC resistance (580 mOhm), limiting suitability to applications with lower current demands and thermal tolerance for increased losses.

Frequently Asked Questions (FAQ)

Q: Can SRR1260-151K replace PM125SH-151M in all applications?

A: SRR1260-151K is a direct substitute meeting all primary matching criteria. The increased current rating (1.55 A versus 1 A) and improved DC resistance (260 mOhm versus 230 mOhm) are compatible with applications designed for the original part. The extended temperature range (-40°C to 125°C versus -30°C to 100°C) provides additional operational margin. Verify PCB layout compatibility with the identical 12.50mm × 12.50mm footprint.

Q: What is the difference between CDRH125NP-151MC and B82477G2154M000?

A: Both parts match the PM125SH-151M electrical specifications (150 µH, 1 A, 230 mOhm). CDRH125NP-151MC is manufactured by Sumida America Components Inc. with a package footprint of 12.00mm × 12.00mm. B82477G2154M000 is manufactured by EPCOS - TDK Electronics with a footprint of 12.30mm × 12.30mm. Both offer ROHS3 compliance and active product status. Selection depends on PCB layout constraints and supplier availability.

Q: Why do some substitutes have higher DC resistance than the original part?

A: DC resistance variations result from differences in wire gauge, winding configuration, and core geometry across manufacturers and product series. Higher DC resistance increases power dissipation and thermal generation. Applications with strict thermal budgets or high-frequency switching should prioritize substitutes with DCR values equal to or lower than the original 230 mOhm specification.

Q: Are SRR1205-151KL and SRR1206-151KL suitable for high-current applications?

A: SRR1205-151KL is rated for 800 mA, below the original 1 A specification, and presents elevated DC resistance (580 mOhm), making it unsuitable for applications requiring the full 1 A current capacity. SRR1206-151KL is rated for 900 mA with 320 mOhm DCR, approaching but not exceeding the original specification. For applications requiring sustained 1 A operation, SRR1260-151K or SRR1208-151KL are preferred.

Q: What is the impact of package dimension variations on PCB design?

A: The original PM125SH-151M occupies a 12.50mm × 12.50mm footprint with 6.50mm maximum height. CDRH125NP-151MC (12.00mm × 12.00mm × 6.00mm) and B82477G2154M000 (12.30mm × 12.30mm × 6.00mm) present smaller footprints, allowing direct substitution with improved board space efficiency. SRR1206-151KL, SRR1205-151KL, and SRR1208-151KL use 12.70mm × 12.70mm footprints, requiring PCB layout modification. SRR1208-151KL and SRR1208-151YL present increased height (8.50mm), necessitating clearance verification in confined assembly spaces.

Q: Does RoHS compliance affect substitution decisions?

A: The original PM125SH-151M is RoHS non-compliant. All recommended substitutes (SRR1260-151K, CDRH125NP-151MC, B82477G2154M000, SRR1206-151KL, SRR1205-151KL, SRR1208-151KL, SRR1208-151YL) are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, substitution to compliant alternatives is mandatory. For legacy systems without regulatory constraints, RoHS status does not affect electrical performance or functional compatibility.

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