PM127SH-220M Equivalent & Substitute Parts

Part Overview

The PM127SH-220M is a 22 µH shielded drum core wirewound inductor manufactured by Bourns Inc., rated for 3.6 A continuous current with a maximum DC resistance of 43 mOhm. This component is classified as obsolete, making identification of suitable alternatives essential for ongoing design support and production continuity. The part operates across a temperature range of -30°C to 100°C and is packaged in a nonstandard surface mount configuration measuring 12.50mm × 12.50mm × 8.00mm.

Key Parameters

Parameter	Value
Inductance	22 µH
Tolerance	±20%
Current Rating	3.6 A
DC Resistance (DCR)	43 mOhm Max
Core Type	Ferrite, Shielded Drum Core
Mounting Type	Surface Mount
Operating Temperature Range	-30°C ~ 100°C
Dimensions	12.50mm L × 12.50mm W × 8.00mm H
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the PM127SH-220M are identified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Inductance Value: Must be 22 µH
Inductance Tolerance: ±20%
Core Material & Shielding: Ferrite, shielded drum core construction
Mounting Type: Surface mount
Package Footprint: Nonstandard 12.50mm × 12.50mm base dimension
Current Rating: Minimum 3.6 A continuous current capability
DC Resistance: Maximum 43 mOhm

Two substitute parts meet these criteria:

SRR1280-220M (Direct Substitute): Exceeds current rating (4.3 A) and improves DC resistance (38.6 mOhm). Active product status with enhanced temperature range and RoHS3 compliance.
SRR1208-220ML (Similar Substitute): Matches current rating (4.6 A) and DC resistance (43 mOhm). Active product status with RoHS3 compliance. Slight dimensional variation (12.70mm × 12.70mm × 8.50mm).

Parameter Comparison

Parameter	PM127SH-220M	SRR1280-220M	SRR1208-220ML
Inductance	22 µH	22 µH	22 µH
Tolerance	±20%	±20%	±20%
Current Rating (Amps)	3.6 A	4.3 A	4.6 A
DC Resistance (DCR)	43 mOhm Max	38.6 mOhm Max	43 mOhm Max
Core Type	Ferrite, Shielded Drum Core	Ferrite, Shielded Drum Core	Ferrite, Shielded Drum Core
Shielding	Shielded	Shielded	Shielded
Operating Temperature	-30°C ~ 100°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Dimensions (L × W × H)	12.50 × 12.50 × 8.00 mm	12.50 × 12.50 × 8.00 mm	12.70 × 12.70 × 8.50 mm
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant
Packaging	Nonstandard	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

SRR1280-220M is the preferred direct substitute. It maintains identical footprint dimensions (12.50mm × 12.50mm × 8.00mm), exceeds the current rating specification (4.3 A vs. 3.6 A), and provides superior DC resistance performance (38.6 mOhm vs. 43 mOhm). The part is active in production, RoHS3 compliant, and operates across an extended temperature range (-40°C to 125°C). Tape & Reel packaging supports automated assembly processes.

SRR1208-220ML serves as an alternative when SRR1280-220M availability is constrained. It maintains electrical equivalence with matching current rating (4.6 A) and DC resistance (43 mOhm). The part is active in production and RoHS3 compliant. Dimensional variation (12.70mm × 12.70mm × 8.50mm) requires PCB layout verification to confirm mechanical clearance compatibility. Cut Tape and Digi-Reel® packaging options support both manual and automated assembly.

Both substitutes are RoHS3 compliant, addressing regulatory requirements absent in the obsolete PM127SH-220M.

Frequently Asked Questions (FAQ)

Q: Can SRR1280-220M be used as a direct replacement for PM127SH-220M?

A: Yes. SRR1280-220M maintains identical inductance (22 µH), tolerance (±20%), core type (ferrite shielded drum core), and footprint dimensions (12.50mm × 12.50mm × 8.00mm). The higher current rating (4.3 A) and lower DC resistance (38.6 mOhm) provide performance margin above the original specification (3.6 A, 43 mOhm).

Q: What is the dimensional difference between SRR1280-220M and SRR1208-220ML?

A: SRR1280-220M matches the original footprint exactly (12.50mm × 12.50mm × 8.00mm). SRR1208-220ML is slightly larger (12.70mm × 12.70mm × 8.50mm). PCB layout verification is required for SRR1208-220ML to confirm adequate clearance around the component.

Q: Are both substitutes RoHS compliant?

A: Yes. Both SRR1280-220M and SRR1208-220ML are RoHS3 compliant. The original PM127SH-220M is RoHS non-compliant.

Q: What is the difference in current rating between the substitutes?

A: SRR1280-220M is rated for 4.3 A continuous current. SRR1208-220ML is rated for 4.6 A continuous current. Both exceed or match the original PM127SH-220M specification of 3.6 A.

Q: Which packaging option is best for automated assembly?

A: SRR1280-220M is supplied in Tape & Reel (TR) format, optimized for automated pick-and-place assembly. SRR1208-220ML is available in Cut Tape (CT) and Digi-Reel® formats, suitable for both manual and automated processes.

Q: Can I use SRR1208-220ML if SRR1280-220M is unavailable?

A: Yes, provided PCB layout accommodates the dimensional variation (12.70mm × 12.70mm × 8.50mm vs. 12.50mm × 12.50mm × 8.00mm). Electrical specifications are equivalent for the application requirements.

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