CMS-18138-25-SP Equivalent & Substitute Parts

Part Overview

The CMS-18138-25-SP is an 8 Ohm general purpose speaker rated at 700 mW with a frequency range of 384 Hz to 20 kHz, manufactured by CUI Devices. This component operates at 90.5 dB SPL and features a rectangular top-ported design with dimensions of 18.00mm × 13.00mm. The product is currently obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing applications and new designs.

Substiute Parts

CMS-18138-25-SP

CUI DevicesIn Stock: 1126CMS-18138-25-SP Datasheet

Current PartRFQ

CMS-18138A-SP

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The CMS-18138A-SP qualifies as a direct substitute based on the following critical parameters:

Electrical compatibility is maintained through identical impedance (8 Ohms) and compatible power ratings (800 mW rated vs. 700 mW rated). Both components operate within acceptable efficiency ranges for general purpose audio applications, with the substitute providing 92 dB SPL versus 90.5 dB SPL.

Mechanical compatibility is preserved through identical physical dimensions (18.00mm × 13.00mm) and height (2.50mm maximum seated height), rectangular shape, and top port location. Both use Nd-Fe-B magnets and polyester/PET cone materials.

The primary distinction is product status: CMS-18138-25-SP is obsolete while CMS-18138A-SP is active. Secondary differences include termination type (solder pads versus spring type) and frequency range variation (384 Hz ~ 20 kHz versus 300 Hz ~ 10 kHz).

Parameter Comparison

Engineering Selection Recommendations

The CMS-18138A-SP is the designated substitute for the obsolete CMS-18138-25-SP. Selection is based on:

Product status: CMS-18138A-SP maintains active manufacturing status with current inventory availability (1292 pcs), ensuring supply chain continuity for new designs and production requirements.

Regulatory compliance: CMS-18138A-SP meets ROHS3 compliance and maintains EAR99 classification identical to the original part. Both components are RoHS compliant and share identical HTSUS codes.

Electrical performance: The substitute provides equivalent impedance and power handling with improved efficiency (92 dB versus 90.5 dB SPL). Rated power increases from 700 mW to 800 mW while maintaining 1 W maximum rating.

Mechanical compatibility: Identical physical dimensions, height, port location, and shape ensure direct mechanical substitution in existing PCB layouts and mechanical assemblies.

Termination consideration: The substitute uses spring-type termination versus solder pads on the original. Circuit design must accommodate this termination method change.

Frequently Asked Questions (FAQ)

Q: Can CMS-18138A-SP replace CMS-18138-25-SP in existing designs?

A: Yes. Identical impedance (8 Ohms), physical dimensions (18.00mm × 13.00mm), and port configuration enable direct substitution. Termination type differs (spring versus solder pads), requiring circuit board modification.

Q: What is the frequency range difference between these parts?

A: CMS-18138-25-SP operates 384 Hz ~ 20 kHz while CMS-18138A-SP operates 300 Hz ~ 10 kHz. The substitute provides lower frequency extension but reduced upper frequency response. Application audio bandwidth requirements determine suitability.

Q: Are there compliance differences?

A: Both parts are RoHS compliant. CMS-18138A-SP meets ROHS3 standard versus RoHS Compliant for the original. Both share identical ECCN (EAR99) and HTSUS (8518.29.8000) classifications.

Q: What is the efficiency difference?

A: CMS-18138A-SP provides 92 dB SPL versus 90.5 dB SPL for the original, representing a 1.5 dB improvement in sound pressure level at rated power.

Q: Why is termination type important?

A: Solder pad termination (original) requires wave or reflow soldering to PCB pads. Spring-type termination (substitute) uses mechanical contact, affecting assembly process, reliability testing, and vibration performance in the application.

Q: Are both parts available for procurement?

A: CMS-18138-25-SP is obsolete with no new manufacturing. CMS-18138A-SP is active with 1292 pcs in current inventory, ensuring supply availability for production and new designs.