PM127SH-220M-RC Equivalent & Substitute Parts

Part Overview

The PM127SH-220M-RC is a 22 µH shielded drum core wirewound inductor manufactured by Bourns Inc., designed for surface mount applications requiring moderate current handling and low DC resistance. This Active product is specified for operating temperatures from -40°C to 125°C and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the critical parameters that define this inductor category.

Key Parameters

Parameter	Value	Unit
Inductance	22	µH
Inductance Tolerance	±20	%
Current Rating	4.3	A
DC Resistance (DCR)	38.6	mOhm Max
Core Material	Ferrite	—
Shielding	Shielded	—
Mounting Type	Surface Mount	—
Package Size	12.50 x 12.50 x 8.00	mm
Operating Temperature Range	-40 to 125	°C

Substitute Part Grouping Explanation

Substitute parts for the PM127SH-220M-RC are qualified based on the following critical parameters:

Inductance Value: 22 µH ±20% tolerance
Current Rating: Minimum 4.0 A continuous current capability
DC Resistance: Maximum 39.1 mOhm
Core Type: Ferrite drum core, shielded construction
Mounting: Surface mount, nonstandard package
Physical Dimensions: 12.50 x 12.50 mm footprint, 8.00 mm maximum height
Operating Temperature: -40°C to 125°C range
Compliance: ROHS3 compliant, MSL 1 rating

Parts meeting these criteria are electrically and mechanically interchangeable within the specified application envelope.

Parameter Comparison

Parameter	PM127SH-220M-RC (Bourns)	SRR1280-220M (Bourns)	DR127-220-R (Eaton)
Manufacturer	Bourns Inc.	Bourns Inc.	Eaton - Electronics Division
Inductance	22 µH	22 µH	22 µH
Tolerance	±20%	±20%	±20%
Current Rating	4.3 A	4.3 A	4.0 A
Current - Saturation (Isat)	4.1 A	4.1 A	7.57 A
DC Resistance (DCR)	38.6 mOhm Max	38.6 mOhm Max	39.1 mOhm
Core Material	Ferrite	Ferrite	Ferrite
Shielding	Shielded	Shielded	Shielded
Q @ Freq	20 @ 2.52 MHz	20 @ 2.52 MHz	—
Frequency - Self Resonant	11 MHz	11 MHz	—
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Inductance Frequency - Test	100 kHz	100 kHz	100 kHz
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package Size (L x W x H)	12.50 x 12.50 x 8.00 mm	12.50 x 12.50 x 8.00 mm	12.50 x 12.50 x 8.00 mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

SRR1280-220M (Bourns Inc.) provides direct electrical and mechanical equivalence to the PM127SH-220M-RC. Both parts share identical inductance, tolerance, current rating, DC resistance, Q factor, and self-resonant frequency specifications. Both are Active products with ROHS3 compliance and MSL 1 rating. Selection between these two Bourns variants depends on packaging availability (Tape & Reel for both) and supply chain considerations.

DR127-220-R (Eaton - Electronics Division) is electrically compatible with a 4.0 A continuous current rating versus 4.3 A for the PM127SH-220M-RC, representing a 7% reduction in rated current. DC resistance is 39.1 mOhm compared to 38.6 mOhm maximum, a 1.3% increase. The saturation current (Isat) of 7.57 A is significantly higher than the 4.1 A specification of the Bourns parts. All three parts maintain identical physical dimensions, operating temperature range, and compliance certifications. The DR127-220-R is suitable for applications where the lower continuous current rating and slightly elevated DC resistance are acceptable within design margins.

Frequently Asked Questions (FAQ)

Q: Can SRR1280-220M replace PM127SH-220M-RC in existing designs?

A: Yes. The SRR1280-220M is electrically and mechanically equivalent. Both are Bourns products with identical inductance (22 µH), current rating (4.3 A), DC resistance (38.6 mOhm max), and physical dimensions (12.50 x 12.50 x 8.00 mm). Both are ROHS3 compliant with MSL 1 rating and Active product status.

Q: What are the limitations of using DR127-220-R as a substitute?

A: The DR127-220-R has a continuous current rating of 4.0 A compared to 4.3 A for the PM127SH-220M-RC. DC resistance is 39.1 mOhm versus 38.6 mOhm maximum. These differences represent 7% and 1.3% variations respectively. The DR127-220-R is suitable only if application current requirements do not exceed 4.0 A and the slightly higher DC resistance is acceptable within circuit design margins.

Q: Are all three parts pin-compatible?

A: Yes. All three parts share identical physical dimensions (12.50 x 12.50 x 8.00 mm) and surface mount nonstandard package configuration, ensuring mechanical and footprint compatibility on PCB layouts.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. PM127SH-220M-RC, SRR1280-220M, and DR127-220-R are all ROHS3 compliant, REACH unaffected, and rated MSL 1 (Unlimited moisture sensitivity). All operate across -40°C to 125°C temperature range.

Q: What is the difference in packaging between these parts?

A: PM127SH-220M-RC and SRR1280-220M are supplied in Tape & Reel (TR) packaging. DR127-220-R is supplied in Cut Tape (CT) & Digi-Reel® packaging. Both packaging formats are suitable for automated assembly processes.

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