TO-24603-B63 Equivalent & Substitute Parts

Part Overview

The TO-24603-B63 is an electret condenser microphone manufactured by Knowles, designed for analog audio capture applications requiring omnidirectional pickup patterns. This component operates across a frequency range of 100 Hz to 9.5 kHz with a sensitivity of -56.5dB ±3dB at 74dB SPL, making it suitable for voice and general audio sensing applications.

The TO-24603-B63 carries an obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for systems currently utilizing this microphone.

Substiute Parts

TO-24603-B63

KnowlesIn Stock: 1059TO-24603-B63 Datasheet

Current PartRFQ

EM-24446-C57

KnowlesIn Stock: 948EM-24446-C57 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TO-24603-B63 is determined by strict alignment across the following critical parameters:

• Microphone type: Electret condenser construction
• Output signal: Analog format
• Directional pattern: Omnidirectional
• Sensitivity specification: -56.5dB ±3dB @ 74dB SPL
• Impedance: 4.4 kOhms
• Rated voltage: 1.3 V with operating range 0.9 V ~ 1.6 V
• Supply current: 50 µA
• Termination method: Solder pads
• Physical footprint: 0.141" x 0.141" (4.67mm x 4.67mm) square form factor

The EM-24446-C57 meets all substitution criteria. This part maintains electrical compatibility across voltage, current, impedance, and sensitivity parameters while preserving the omnidirectional analog output and solder pad termination required for direct replacement applications.

Parameter Comparison

Engineering Selection Recommendations

The EM-24446-C57 is the manufacturer-recommended substitute for the obsolete TO-24603-B63. Both components are manufactured by Knowles and share identical electrical specifications for voltage, current, impedance, and sensitivity.

The EM-24446-C57 offers the advantage of active product status, ensuring ongoing availability and manufacturer support. The extended frequency range (100 Hz ~ 10 kHz versus 100 Hz ~ 9.5 kHz) provides additional bandwidth capability without compromising compatibility with existing designs.

The primary design consideration is the increased maximum height of the EM-24446-C57 (0.090" versus 0.053"). PCB layout and component clearance must be verified to confirm the substitute part fits within the available vertical space of the target application.

The EM-24446-C57 carries RoHS3 compliance certification, supporting modern regulatory requirements for electronic component manufacturing and end-of-life management.

Frequently Asked Questions (FAQ)

Q: Can the EM-24446-C57 directly replace the TO-24603-B63 in existing designs?

A: Yes, provided PCB clearance accommodates the increased height. The EM-24446-C57 maintains all critical electrical parameters: 1.3 V rated voltage, 50 µA supply current, 4.4 kOhms impedance, and -56.5dB ±3dB sensitivity. Solder pad termination and 4.67mm x 4.67mm footprint are identical.

Q: What is the significance of the frequency range difference?

A: The EM-24446-C57 extends the upper frequency limit to 10 kHz compared to 9.5 kHz for the TO-24603-B63. This provides additional bandwidth for applications requiring extended high-frequency response. Applications designed for the original 9.5 kHz limit remain fully compatible.

Q: Are there compliance or certification differences between these parts?

A: The EM-24446-C57 is RoHS3 compliant and carries active product status. The TO-24603-B63 is obsolete. Both parts are REACH unaffected and carry EAR99 export classification. The EM-24446-C57 is the recommended choice for new designs and ongoing production.

Q: What is the height difference impact on PCB design?

A: The EM-24446-C57 maximum height is 0.090" (2.28mm) compared to 0.053" (1.35mm) for the TO-24603-B63. Verify available vertical clearance on the PCB assembly, including proximity to other components, conformal coatings, or enclosure constraints.

Q: Is the EM-24446-C57 available in the same packaging as the TO-24603-B63?

A: The EM-24446-C57 is supplied in bulk packaging. Confirm packaging and quantity requirements with your component supplier to align with procurement and assembly processes.