PM125SH-220M Equivalent & Substitute Parts

Part Overview

The PM125SH-220M is a 22 µH shielded drum core wirewound inductor manufactured by Bourns Inc., rated for 2.8 A continuous current with 36 mOhm maximum DC resistance. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across -30°C to 100°C and is mounted as a surface mount nonstandard package component.

Key Parameters

Parameter	Value
Inductance	22 µH
Inductance Tolerance	±20%
Current Rating	2.8 A
DC Resistance (DCR)	36 mOhm Max
Core Material	Ferrite
Shielding	Shielded
Mounting Type	Surface Mount
Operating Temperature Range	-30°C ~ 100°C
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the PM125SH-220M are grouped based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Inductance value: 22 µH (exact match required)
Inductance tolerance: ±20% (exact match required)
Core type: Ferrite shielded drum core wirewound
Mounting type: Surface Mount
DC Resistance: 36 mOhm maximum (electrical performance requirement)
Current rating: Minimum 2.8 A (equal or greater acceptable)

Substitution Categories:

Direct Equivalent (Identical Electrical & Mechanical Specifications):

B82477G2223M000 (EPCOS - TDK Electronics): Matches all critical parameters including 2.8 A rating and 36 mOhm DCR. Offers improved RoHS3 compliance and extended temperature range (-55°C ~ 125°C).
CDRH125NP-220MC (Sumida America Components Inc.): Matches all critical parameters including 2.8 A rating and 36 mOhm DCR. Active product status with RoHS3 compliance.

Higher Current Rating Substitutes (Acceptable for Current Derating Applications):

SRR1260-220M (Bourns Inc.): 4 A rating with 43 mOhm DCR. Provides current margin above the 2.8 A requirement. Active product with RoHS3 compliance and extended temperature range (-40°C ~ 125°C).
SRR1208-220ML (Bourns Inc.): 4.6 A rating with 43 mOhm DCR. Provides current margin above the 2.8 A requirement. Active product with RoHS3 compliance and extended temperature range (-40°C ~ 125°C).

Lower Current Rating Substitutes (Acceptable for Current-Limited Applications):

SRR1206-220ML (Bourns Inc.): 2.3 A rating with 62 mOhm DCR. Lower current rating requires application verification. Active product with RoHS3 compliance and extended temperature range (-40°C ~ 125°C).
SRR1205-220ML (Bourns Inc.): 2.4 A rating with 95 mOhm DCR. Lower current rating and higher DCR require application verification. Active product with RoHS3 compliance and extended temperature range (-40°C ~ 125°C).

Parameter Comparison

Part Number	Manufacturer	Inductance	Current Rating (A)	DCR (mOhm Max)	Operating Temp (°C)	RoHS Status	Product Status
PM125SH-220M	Bourns Inc.	22 µH ±20%	2.8	36	-30 ~ 100	Non-compliant	Obsolete
SRR1260-220M	Bourns Inc.	22 µH ±20%	4.0	43	-40 ~ 125	ROHS3 Compliant	Active
SRR1205-220ML	Bourns Inc.	22 µH ±20%	2.4	95	-40 ~ 125	ROHS3 Compliant	Active
SRR1206-220ML	Bourns Inc.	22 µH ±20%	2.3	62	-40 ~ 125	ROHS3 Compliant	Active
SRR1208-220ML	Bourns Inc.	22 µH ±20%	4.6	43	-40 ~ 125	ROHS3 Compliant	Active
B82477G2223M000	EPCOS - TDK Electronics	22 µH ±20%	2.8	36	-55 ~ 125	ROHS3 Compliant	Active
CDRH125NP-220MC	Sumida America Components Inc.	22 µH ±20%	2.8	36	-40 ~ 100	ROHS3 Compliant	Active

Engineering Selection Recommendations

Recommended Primary Substitutes:

B82477G2223M000 - Preferred for new designs and production continuity. Identical electrical specifications (2.8 A, 36 mOhm DCR) with RoHS3 compliance and superior temperature range (-55°C ~ 125°C). Manufactured by EPCOS - TDK Electronics, an established supplier with active product status.
CDRH125NP-220MC - Alternative equivalent option with identical electrical specifications (2.8 A, 36 mOhm DCR) and RoHS3 compliance. Manufactured by Sumida America Components Inc. with active product status.

Secondary Substitutes for Current-Margin Applications:

SRR1260-220M - Suitable when higher current capacity is beneficial. Provides 4 A rating with acceptable 43 mOhm DCR increase. Bourns Inc. active product with RoHS3 compliance and extended temperature range.
SRR1208-220ML - Suitable when moderate current margin is required. Provides 4.6 A rating with acceptable 43 mOhm DCR increase. Bourns Inc. active product with RoHS3 compliance and extended temperature range.

Not Recommended for Direct Substitution:

SRR1206-220ML and SRR1205-220ML - Current ratings (2.3 A and 2.4 A respectively) fall below the original 2.8 A specification. These parts require application-level verification to confirm adequate current margin exists in the circuit design.

All substitute parts maintain the 22 µH inductance value, ±20% tolerance, ferrite shielded drum core construction, and surface mount configuration required for mechanical and electrical compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use SRR1260-220M as a direct replacement for PM125SH-220M?

A: Yes. The SRR1260-220M maintains the same 22 µH inductance, ±20% tolerance, and ferrite shielded construction. The 4 A current rating exceeds the original 2.8 A requirement, providing design margin. The 43 mOhm DCR is slightly higher than the original 36 mOhm specification but remains within acceptable limits for most applications. Verify circuit performance under actual operating conditions.

Q: What is the difference between the Bourns SRR series substitutes?

A: The SRR series substitutes differ primarily in current rating and DC resistance. SRR1260-220M offers the highest current capacity (4 A) with 43 mOhm DCR. SRR1208-220ML provides 4.6 A with 43 mOhm DCR. SRR1206-220ML and SRR1205-220ML offer lower current ratings (2.3 A and 2.4 A respectively) with higher DCR values (62 mOhm and 95 mOhm). All maintain identical inductance and tolerance specifications.

Q: Why is B82477G2223M000 recommended over other substitutes?

A: B82477G2223M000 provides exact electrical equivalence to the PM125SH-220M (2.8 A, 36 mOhm DCR) while offering RoHS3 compliance and an extended operating temperature range (-55°C ~ 125°C versus -30°C ~ 100°C). This combination ensures both electrical compatibility and regulatory compliance for modern production requirements.

Q: Are there mechanical compatibility concerns with these substitutes?

A: All substitute parts are surface mount components with similar footprint dimensions (12.00 mm to 12.70 mm length and width). Height variations exist: PM125SH-220M is 6.50 mm, while substitutes range from 5.50 mm to 8.50 mm. Verify PCB layout clearance, particularly for components with 8.50 mm height (SRR1208-220ML). Consult component datasheets for exact dimensional specifications.

Q: Can I use SRR1205-220ML or SRR1206-220ML if my circuit operates below 2.8 A?

A: These parts have current ratings below the original specification (2.4 A and 2.3 A respectively). Use only if circuit analysis confirms the actual operating current remains below the substitute part's rating with adequate safety margin. Higher DCR values (95 mOhm and 62 mOhm) will increase power dissipation compared to the original 36 mOhm specification.

Q: What is the impact of higher DCR on circuit performance?

A: Higher DC resistance increases power dissipation (P = I²R) and reduces circuit efficiency. For the PM125SH-220M operating at 2.8 A with 36 mOhm DCR, power loss is approximately 282 mW. Substitutes with higher DCR (43 mOhm, 62 mOhm, or 95 mOhm) will increase this dissipation proportionally. Evaluate thermal management and efficiency requirements before selecting higher-DCR alternatives.

Q: Are all substitute parts RoHS compliant?

A: The original PM125SH-220M is RoHS non-compliant. All recommended substitutes (B82477G2223M000, CDRH125NP-220MC, and the SRR series) are ROHS3 compliant, meeting current regulatory requirements for new designs and production.

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