PM127SH-121M-RC Equivalent & Substitute Parts

Part Overview

The PM127SH-121M-RC is a 120 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 can be maintained within the specified parameter tolerances for this product category.

Substiute Parts

PM127SH-121M-RC

Bourns Inc.In Stock: 1119PM127SH-121M-RC Datasheet

Current PartRFQ

SRR1280-121K

Bourns Inc.In Stock: 4521SRR1280-121K Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PM127SH-121M-RC is determined by the following critical parameters:

Inductance Value: 120 µH (primary electrical specification)

Current Rating: Minimum 1.9 A (saturation current must meet or exceed the main part specification)

DC Resistance: 200 mOhm Max (electrical loss parameter)

Shielding Configuration: Shielded (electromagnetic containment requirement)

Core Material: Ferrite (magnetic performance and frequency response)

Package Footprint: 12.50mm x 12.50mm (mechanical fit requirement)

Height: 8.00mm Max (board clearance constraint)

Mounting Type: Surface Mount (assembly compatibility)

Operating Temperature Range: -40°C to 125°C (thermal specification)

Compliance: ROHS3 Compliant (regulatory requirement)

The SRR1280-121K meets all substitution criteria within these parameters.

Parameter Comparison

Engineering Selection Recommendations

Both the PM127SH-121M-RC and SRR1280-121K are Active products from Bourns Inc. with identical ROHS3 compliance and REACH unaffected status. The SRR1280-121K provides equivalent or superior electrical performance across all specified parameters, with a tighter inductance tolerance (±10% versus ±20%) and marginally higher current rating (1.95 A versus 1.9 A). Both parts maintain identical mechanical footprints, thermal operating ranges, and shielding characteristics. Selection between these parts depends on application-specific tolerance requirements and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the SRR1280-121K directly replace the PM127SH-121M-RC in existing designs?

A: Yes. Both parts share identical inductance values, DC resistance specifications, package dimensions, height, mounting type, and operating temperature ranges. The SRR1280-121K meets or exceeds all electrical requirements of the PM127SH-121M-RC.

Q: What is the difference in inductance tolerance between these parts?

A: The PM127SH-121M-RC specifies ±20% tolerance, while the SRR1280-121K specifies ±10% tolerance. Applications requiring tighter inductance accuracy should specify the SRR1280-121K.

Q: Are there current rating differences between these inductors?

A: The PM127SH-121M-RC is rated at 1.9 A, while the SRR1280-121K is rated at 1.95 A. Both parts satisfy applications designed for 1.9 A operation.

Q: Do these parts have identical physical dimensions?

A: Yes. Both parts measure 12.50mm x 12.50mm with a maximum seated height of 8.00mm, ensuring identical PCB footprint compatibility.

Q: Are both parts compliant with current regulatory requirements?

A: Yes. Both the PM127SH-121M-RC and SRR1280-121K are ROHS3 compliant and REACH unaffected.

Q: What is the moisture sensitivity level for these inductors?

A: Both parts are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.