FK-26746-000 Equivalent & Substitute Parts

Part Overview

The FK-26746-000 is a 630 Ohms balanced armature receiver speaker manufactured by Knowles, designed for applications requiring rectangular form factor audio reception across the 200 Hz to 6 kHz frequency range. This component is classified as obsolete, necessitating identification of active equivalent parts to maintain supply chain continuity and support ongoing production requirements.

Substiute Parts

FK-26746-000

KnowlesIn Stock: 1161FK-26746-000 Datasheet

Current PartRFQ

FK-23451-000

KnowlesIn Stock: 1126FK-23451-000 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FK-26746-000 is determined by the following critical parameters:

• Impedance: 630 Ohms (exact match required)
• Type: Receiver, Balanced Armature (exact match required)
• Technology: Magnetic (exact match required)
• Termination: Solder Pads (exact match required)
• Frequency Range: Minimum 200 Hz lower bound; upper frequency extension acceptable
• Shape: Rectangular (exact match required)
• Footprint Dimensions: 0.197" L x 0.108" W (5.00mm x 2.73mm) (exact match required)
• RoHS Compliance: ROHS3 Compliant (required for regulatory alignment)

The FK-23451-000 qualifies as a direct substitute based on matching all critical electrical and mechanical parameters. The substitute part maintains identical impedance, type, technology, termination method, and footprint dimensions. Extended frequency range (200 Hz ~ 6.5 kHz) and increased efficiency (95.50 dBA SPL) represent functional improvements. The substitute transitions from obsolete to active product status, ensuring long-term availability.

Parameter Comparison

Engineering Selection Recommendations

The FK-23451-000 is the qualified substitute for the obsolete FK-26746-000. Both components maintain ROHS3 compliance and MSL Level 1 rating, ensuring regulatory and environmental compatibility. The substitute part is currently in active production status, providing assured supply chain availability.

The primary design consideration is the increased seated height of the FK-23451-000 (0.197" versus 0.078"). Applications with height constraints must evaluate mechanical fit within the assembly. The extended frequency range (6.5 kHz upper limit versus 6 kHz) and specified efficiency rating (95.50 dBA SPL) represent performance enhancements suitable for direct replacement in standard applications.

Both parts share identical electrical characteristics (630 Ohms impedance, solder pad termination) and mechanical footprint (5.00mm x 2.73mm), supporting direct circuit board integration without redesign.

Frequently Asked Questions (FAQ)

Q: Can FK-23451-000 replace FK-26746-000 in all applications?

A: The FK-23451-000 qualifies as a direct electrical and mechanical substitute. The increased seated height (0.197" versus 0.078") must be verified against available assembly space. If height clearance exists, substitution is valid without circuit modification.

Q: Are the impedance and frequency characteristics identical?

A: Impedance is identical at 630 Ohms. The substitute part extends the upper frequency response from 6 kHz to 6.5 kHz, which is compatible with applications designed for the original 200 Hz ~ 6 kHz range.

Q: What is the significance of the top port location on the substitute part?

A: The FK-23451-000 specifies top port location, whereas the FK-26746-000 does not specify port location. This indicates acoustic design differences. Applications requiring specific port orientation must confirm compatibility with the top-mounted configuration.

Q: Are both parts RoHS compliant?

A: Yes. Both FK-26746-000 and FK-23451-000 are ROHS3 compliant with MSL Level 1 rating, meeting current regulatory requirements for electronic component manufacturing and assembly.

Q: Why is the original part obsolete?

A: The FK-26746-000 is classified as obsolete by the manufacturer. The FK-23451-000 represents the active equivalent, ensuring continued availability and manufacturer support for new designs and production requirements.