CDS-18138A Equivalent & Substitute Parts

Part Overview

The CDS-18138A is an 8 Ohm general purpose speaker manufactured by CUI Devices, rated for 700 mW power handling with a frequency range of 300 Hz to 20 kHz. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The speaker features a top-mounted rectangular port configuration with Nd-Fe-B magnetic technology and polyester cone material, delivering 89 dBA sound pressure level at rated power.

Substiute Parts

CDS-18138A

CUI DevicesIn Stock: 1025CDS-18138A Datasheet

Current PartRFQ

CMS-18138A-SP

CUI DevicesIn Stock: 1364CMS-18138A-SP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CDS-18138A is determined by the following critical parameters:

Mandatory Matching Parameters:

• Impedance: 8 Ohms
• Port Location: Top
• Shape: Rectangular
• Size / Dimension: 0.709" L x 0.512" W (18.00mm x 13.00mm)
• Height - Seated (Max): 0.098" (2.50mm)
• Termination: Spring Type
• Material - Cone: Polyester, Polyethylene Terephthalate (PET)
• Material - Magnet: Nd-Fe-B

Allowable Variation Parameters:

• Power - Rated: May increase up to 800 mW
• Efficiency - dBA: May increase from 89.00 dBA
• Frequency Range: May narrow from 300 Hz ~ 20 kHz
• Product Status: May transition from Obsolete to Active

The CMS-18138A-SP qualifies as a direct substitute based on matching all mandatory parameters while offering improved power handling and efficiency ratings.

Parameter Comparison

Engineering Selection Recommendations

The CMS-18138A-SP is a qualified substitute for the obsolete CDS-18138A. Selection of the CMS-18138A-SP is supported by the following factors:

Product Status: The CMS-18138A-SP maintains active product status, ensuring ongoing availability and manufacturing support compared to the obsolete CDS-18138A.

Regulatory Compliance: The CMS-18138A-SP carries ROHS3 Compliant certification, representing a higher compliance standard than the RoHS Compliant rating of the original part. This upgrade provides enhanced environmental and regulatory alignment for new designs and production runs.

Electrical Performance: The CMS-18138A-SP delivers 800 mW rated power handling versus 700 mW for the CDS-18138A, with improved efficiency of 92.00 dBA compared to 89.00 dBA. These performance enhancements are compatible with applications designed for the original part.

Mechanical Compatibility: All physical parameters—dimensions, height, port location, shape, and termination type—are identical between the two parts, ensuring direct mechanical interchangeability in existing designs.

Frequently Asked Questions (FAQ)

Q: Can the CMS-18138A-SP be used as a direct replacement for the CDS-18138A in existing designs?

A: Yes. The CMS-18138A-SP matches all mandatory mechanical and electrical parameters of the CDS-18138A, including impedance, dimensions, port configuration, and termination type. No circuit modifications are required.

Q: What is the difference in frequency response between these parts?

A: The CDS-18138A operates across 300 Hz to 20 kHz, while the CMS-18138A-SP operates across 300 Hz to 10 kHz. The CMS-18138A-SP has a narrower upper frequency range but maintains the same lower frequency limit. Applications requiring response above 10 kHz should be evaluated against the CMS-18138A-SP specifications.

Q: Why does the CMS-18138A-SP have higher efficiency?

A: The CMS-18138A-SP is rated at 92.00 dBA efficiency versus 89.00 dBA for the CDS-18138A. Both measurements are conducted at their respective rated power levels (800 mW and 700 mW). The higher efficiency rating reflects the improved acoustic performance of the substitute part.

Q: Are there packaging differences between these parts?

A: The CDS-18138A uses spring-type termination without specified packaging detail. The CMS-18138A-SP is supplied in Tray packaging. Both parts use identical spring-type termination for circuit board integration.

Q: What is the self-resonant frequency difference?

A: The CDS-18138A has a self-resonant frequency of 375 Hz, while the CMS-18138A-SP is rated at 400 Hz. This 25 Hz difference reflects the acoustic design variations between the general purpose and low profile speaker types.

Q: Is the CMS-18138A-SP suitable for applications originally designed for 700 mW operation?

A: Yes. The CMS-18138A-SP is rated for 800 mW, exceeding the original 700 mW requirement. It can be operated at the original 700 mW power level without exceeding its design limits.