PM125SH-271M Equivalent & Substitute Parts

Part Overview

The PM125SH-271M is a 270 µH shielded drum core, wirewound inductor manufactured by Bourns Inc., rated for 750 mA with a maximum DC resistance of 460mOhm. This component operates across the temperature range of -30°C to 100°C and is mounted as a surface mount device with nonstandard packaging dimensions of 12.50mm × 12.50mm × 6.50mm (height).

The PM125SH-271M 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 requiring 270 µH inductance at 750 mA current ratings.

Key Parameters

Parameter	PM125SH-271M
Inductance	270 µH
Current Rating	750 mA
DC Resistance (DCR)	460mOhm Max
Tolerance	±20%
Shielding	Shielded
Core Material	Ferrite
Operating Temperature	-30°C ~ 100°C
Mounting Type	Surface Mount
Size / Dimension	12.50mm × 12.50mm × 6.50mm (H)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the PM125SH-271M are selected based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Inductance value: 270 µH (exact match required)
Shielding: Shielded configuration
Core material: Ferrite drum core
Mounting type: Surface mount
Current rating: Minimum 750 mA or higher
DC resistance: Within acceptable operating parameters for the application

Substitution Logic:

Substitute parts are grouped into two categories based on their relationship to the main part:

Direct Manufacturer Substitute (SRR1260-271K): Manufactured by Bourns Inc., the same manufacturer as the main part. This part maintains the same inductance value and shielding characteristics while offering improved current handling (1.3 A vs. 750 mA) and lower DC resistance (450mOhm vs. 460mOhm). The part is active and RoHS3 compliant.

Similar Manufacturer Substitutes (SRR1205-271KL, SRR1206-271KL, SRR1208-271KL): All manufactured by Bourns Inc. These parts share the same inductance value, shielding, and core material. They differ in current ratings (600 mA to 950 mA), DC resistance values (400mOhm to 1Ohm), and physical dimensions. All are active products with RoHS3 compliance and extended operating temperature ranges (-40°C to 125°C).

Cross-Manufacturer Substitutes (CDRH125NP-271MC, SPD125R-274M): Manufactured by Sumida America Components Inc. and API Delevan Inc., respectively. Both maintain the 270 µH inductance, 750 mA current rating, and shielded ferrite core configuration. These parts offer RoHS3 compliance and extended temperature ranges.

Parameter Comparison

Part Number	Manufacturer	Inductance	Current Rating	DCR (Max)	Tolerance	Operating Temp	RoHS Status	Product Status	Size (L×W×H)
PM125SH-271M	Bourns Inc.	270 µH	750 mA	460mOhm	±20%	-30°C ~ 100°C	Non-compliant	Obsolete	12.50 × 12.50 × 6.50mm
SRR1260-271K	Bourns Inc.	270 µH	1.3 A	450mOhm	±10%	-40°C ~ 125°C	ROHS3 Compliant	Active	12.50 × 12.50 × 6.50mm
SRR1205-271KL	Bourns Inc.	270 µH	600 mA	1Ohm	±10%	-40°C ~ 125°C	ROHS3 Compliant	Active	12.70 × 12.70 × 5.50mm
SRR1206-271KL	Bourns Inc.	270 µH	650 mA	520mOhm	±10%	-40°C ~ 125°C	ROHS3 Compliant	Active	12.70 × 12.70 × 6.50mm
SRR1208-271KL	Bourns Inc.	270 µH	950 mA	400mOhm	±10%	-40°C ~ 125°C	ROHS3 Compliant	Active	12.70 × 12.70 × 8.50mm
CDRH125NP-271MC	Sumida America Components Inc.	270 µH	750 mA	460mOhm	±20%	-40°C ~ 100°C	ROHS3 Compliant	Active	12.00 × 12.00 × 6.00mm
SPD125R-274M	API Delevan Inc.	270 µH	750 mA	510mOhm	±20%	-55°C ~ 125°C	ROHS3 Compliant	Active	12.00 × 12.00 × 6.00mm

Engineering Selection Recommendations

For Direct Replacement (Same Electrical Performance):

SRR1260-271K is the primary recommended substitute. Manufactured by Bourns Inc., it maintains identical physical dimensions (12.50mm × 12.50mm × 6.50mm) and inductance value. The part offers superior specifications with higher current rating (1.3 A vs. 750 mA), lower DC resistance (450mOhm vs. 460mOhm), and tighter tolerance (±10% vs. ±20%). RoHS3 compliance and active product status ensure long-term availability and regulatory alignment.

For Current-Limited Applications (600 mA to 950 mA):

SRR1205-271KL, SRR1206-271KL, and SRR1208-271KL provide graduated current ratings with improved specifications. Selection depends on application current requirements and thermal constraints. All three are Bourns Inc. products with RoHS3 compliance and extended temperature ranges (-40°C to 125°C). Physical dimensions vary slightly; verify PCB layout compatibility before selection.

For Cross-Manufacturer Substitution:

CDRH125NP-271MC (Sumida America Components Inc.) and SPD125R-274M (API Delevan Inc.) provide equivalent electrical performance at 750 mA with identical inductance and shielding. Both are RoHS3 compliant and active products. Physical dimensions are slightly smaller (12.00mm × 12.00mm), requiring PCB layout verification. SPD125R-274M offers extended low-temperature operation (-55°C vs. -40°C).

Compliance Consideration:

The PM125SH-271M is RoHS non-compliant. All substitute parts listed are RoHS3 compliant, supporting modern design requirements and regulatory standards.

Frequently Asked Questions (FAQ)

Q: Can SRR1205-271KL replace PM125SH-271M in a 750 mA application?

A: SRR1205-271KL is rated for 600 mA maximum current, which is below the 750 mA requirement of the original part. This substitute is suitable only for applications with current requirements of 600 mA or lower. For 750 mA operation, use SRR1206-271KL, SRR1208-271KL, SRR1260-271K, CDRH125NP-271MC, or SPD125R-274M.

Q: What is the difference between ±20% and ±10% tolerance?

A: Tolerance specifies the acceptable deviation from the nominal inductance value. PM125SH-271M with ±20% tolerance allows inductance between 216 µH and 324 µH. Substitute parts with ±10% tolerance (SRR series) allow inductance between 243 µH and 297 µH, providing tighter control and more predictable circuit performance.

Q: Are there physical dimension differences between substitutes?

A: Yes. SRR1260-271K maintains identical dimensions (12.50mm × 12.50mm × 6.50mm) to the original part. SRR1205-271KL, SRR1206-271KL, and SRR1208-271KL use 12.70mm × 12.70mm footprints with varying heights (5.50mm to 8.50mm). CDRH125NP-271MC and SPD125R-274M use 12.00mm × 12.00mm footprints. Verify PCB layout and clearance requirements before substitution.

Q: Which substitute offers the best thermal performance?

A: SRR1208-271KL provides the lowest DC resistance (400mOhm) among Bourns substitutes, resulting in minimal resistive heating. SPD125R-274M offers the widest operating temperature range (-55°C to 125°C), supporting extreme low-temperature environments.

Q: Is SRR1260-271K a direct equivalent to PM125SH-271M?

A: SRR1260-271K is functionally equivalent with improved specifications. It maintains the same inductance (270 µH), shielding, core material, mounting type, and physical dimensions. The part offers higher current rating, lower DC resistance, tighter tolerance, and RoHS3 compliance. No circuit redesign is required for substitution.

Q: What is the difference between Bourns and cross-manufacturer substitutes?

A: Bourns Inc. substitutes (SRR series) are from the original manufacturer, ensuring design consistency and performance predictability. Cross-manufacturer substitutes (Sumida and API Delevan) provide equivalent electrical specifications but may have different internal construction and performance characteristics. Both options are valid; selection depends on supply chain availability and application requirements.

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