PM125SH-470M Equivalent & Substitute Parts

Part Overview

The PM125SH-470M is a 47 µH shielded drum core wirewound inductor manufactured by Bourns Inc., rated for 1.8 A with a maximum DC resistance of 75 mOhm. This component features surface mount packaging in a nonstandard 12.50mm x 12.50mm footprint with a seated height of 6.50mm. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts maintain the same inductance value and core shielding characteristics while offering improved availability and compliance status.

Key Parameters

Parameter	Value
Inductance	47 µH
Tolerance	±20%
Current Rating	1.8 A
DC Resistance (DCR)	75 mOhm Max
Core Type	Ferrite, Shielded Drum Core
Mounting Type	Surface Mount
Operating Temperature Range	-30°C ~ 100°C
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the PM125SH-470M is determined by the following critical parameters: inductance value (47 µH), core material and shielding (ferrite, shielded), mounting type (surface mount), and physical footprint compatibility (12.50mm x 12.50mm base dimensions). Current rating and DC resistance are secondary selection criteria that allow for flexibility based on circuit requirements. All substitute parts maintain the same inductance specification and shielding configuration, ensuring functional equivalence in filtering and energy storage applications.

The substitute parts are grouped into two categories: direct replacement (SRR1260-470M) offering higher current capacity with improved compliance, and compatible alternatives (SRR1206-470YL and SRR1208-470YL) providing active product status with enhanced temperature ranges.

Parameter Comparison

Parameter	PM125SH-470M	SRR1260-470M	SRR1206-470YL	SRR1208-470YL
Inductance	47 µH	47 µH	47 µH	47 µH
Tolerance	±20%	±20%	±15%	±15%
Current Rating (Amps)	1.8 A	2.6 A	1.6 A	2.2 A
DC Resistance (DCR)	75 mOhm Max	86 mOhm Max	130 mOhm Max	85 mOhm Max
Core Type	Ferrite, Shielded	Ferrite, Shielded	Ferrite, Shielded	Ferrite, Shielded
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-30°C ~ 100°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SRR1260-470M is the primary direct substitute, offering identical inductance and shielding with improved current capacity (2.6 A versus 1.8 A), lower DC resistance (86 mOhm versus 75 mOhm), active product status, and ROHS3 compliance. This part maintains the same 12.50mm x 12.50mm footprint and 6.50mm height, enabling direct PCB layout compatibility.

SRR1208-470YL provides an alternative with 2.2 A current rating and 85 mOhm DCR, suitable for applications requiring higher current handling than the original PM125SH-470M. This part features a slightly increased height of 8.50mm and active status with full ROHS3 compliance.

SRR1206-470YL is suitable for applications where current requirements are lower (1.6 A) and cost optimization is prioritized. This part has higher DC resistance (130 mOhm) and should be selected only when thermal dissipation and current margins permit.

All substitute parts provide extended operating temperature ranges (-40°C ~ 125°C versus -30°C ~ 100°C) and ROHS3 compliance, addressing regulatory requirements absent in the obsolete PM125SH-470M.

Frequently Asked Questions (FAQ)

Q: Can SRR1260-470M be used as a direct replacement for PM125SH-470M? A: Yes. Both parts share identical inductance (47 µH), core shielding, and physical footprint (12.50mm x 12.50mm, 6.50mm height). The SRR1260-470M offers higher current capacity and improved compliance status.

Q: What are the physical differences between substitute parts? A: SRR1206-470YL and SRR1208-470YL have a footprint of 12.70mm x 12.70mm compared to the 12.50mm x 12.50mm of PM125SH-470M and SRR1260-470M. SRR1208-470YL has a seated height of 8.50mm versus 6.50mm for the others. These dimensional changes may require PCB layout verification.

Q: Which substitute should be selected for new designs? A: SRR1260-470M is recommended for new designs due to active product status, ROHS3 compliance, improved current rating, and identical physical footprint to the original part.

Q: Are there current rating limitations when substituting? A: The PM125SH-470M is rated for 1.8 A. SRR1260-470M (2.6 A) and SRR1208-470YL (2.2 A) exceed this rating and are suitable for higher-current applications. SRR1206-470YL (1.6 A) is below the original rating and should only be used if circuit current requirements are confirmed lower than 1.6 A.

Q: What is the impact of DC resistance differences? A: PM125SH-470M has 75 mOhm DCR. SRR1260-470M (86 mOhm) and SRR1208-470YL (85 mOhm) have slightly higher resistance with minimal thermal impact. SRR1206-470YL (130 mOhm) has significantly higher resistance and generates more heat; thermal analysis is required before selection.

Q: Do all substitutes have the same inductance tolerance? A: PM125SH-470M and SRR1260-470M have ±20% tolerance. SRR1206-470YL and SRR1208-470YL have tighter ±15% tolerance, providing better inductance accuracy for precision applications.

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