Equivalent & Substitute Parts for CI-28512-017

Part Overview

The CI-28512-017 is a 140 Ohms Receiver with Balanced Armature technology manufactured by Knowles. This component operates across a 200 Hz to 5.5 kHz frequency range with a top port configuration and rectangular form factor. The part is classified as Obsolete, making identification of suitable substitutes necessary for ongoing design requirements and procurement planning. The equivalent substitute maintains core acoustic and mechanical compatibility while offering active product status and improved availability.

Substiute Parts

CI-28512-017

KnowlesIn Stock: 790CI-28512-017 Datasheet

Current PartRFQ

CI-28329-000

KnowlesIn Stock: 812CI-28329-000 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The CI-28329-000 qualifies as an equivalent substitute based on the following alignment of critical parameters:

• Identical frequency range (200 Hz ~ 5.5 kHz)
• Identical efficiency rating (131.50 dBA)
• Identical physical dimensions (0.373" L x 0.283" W; 9.47mm x 7.18mm)
• Identical seated height (0.165" / 4.19mm)
• Identical termination method (Solder Pads)
• Identical RoHS3 compliance and MSL rating
• Identical technology (Magnetic, Balanced Armature)

The primary differences are impedance (120 Ohms vs. 140 Ohms) and port location (Side vs. Top). These variations require circuit-level evaluation for specific applications but do not preclude substitution in designs where impedance matching and port orientation can be accommodated.

Parameter Comparison

Engineering Selection Recommendations

The CI-28329-000 is the designated manufacturer substitute for the obsolete CI-28512-017. Selection of this substitute is supported by:

• Active product status ensuring continued availability and supply chain reliability
• Full compliance with ROHS3 and equivalent environmental certifications
• Identical acoustic performance (131.50 dBA sensitivity)
• Identical frequency response characteristics (200 Hz ~ 5.5 kHz)
• Identical mechanical envelope and mounting footprint
• Identical termination and handling requirements (MSL 1)

Circuit design modifications are required to accommodate the 20 Ohm impedance reduction (140 Ohms to 120 Ohms) and the port location change from top to side orientation. These modifications fall within standard receiver circuit design practices and do not introduce compatibility barriers for typical audio receiver applications.

Frequently Asked Questions (FAQ)

Q: Can CI-28329-000 be used as a direct drop-in replacement for CI-28512-017?

A: Physical and acoustic compatibility is confirmed. The identical dimensions, frequency range, and sensitivity rating support mechanical and acoustic interchangeability. However, the impedance difference (120 Ohms vs. 140 Ohms) and port location change (Side vs. Top) require circuit-level evaluation and potential layout modifications specific to your application.

Q: What is the impedance difference impact?

A: The CI-28329-000 operates at 120 Ohms compared to the CI-28512-017 at 140 Ohms. This 20 Ohm reduction affects impedance matching in the receiver circuit. Applications using impedance-matched driver stages will require component value adjustments to maintain proper signal delivery and frequency response.

Q: Does the port location change affect performance?

A: Port location (Top vs. Side) affects acoustic coupling and mechanical integration within the device enclosure. Top port configuration directs acoustic output vertically, while side port configuration directs output horizontally. Selection depends on the specific acoustic design and enclosure geometry of your application.

Q: Are compliance certifications equivalent?

A: Both parts carry identical ROHS3 compliance and MSL 1 ratings. Environmental handling, storage, and regulatory requirements are equivalent between the two components.

Q: Why is CI-28512-017 obsolete?

A: The CI-28512-017 is classified as obsolete by the manufacturer. The CI-28329-000 represents the active product line continuation with equivalent acoustic and mechanical specifications.