CMS-15118-25-SP Equivalent & Substitute Parts

Part Overview

The CMS-15118-25-SP is an 8 Ohm general purpose speaker manufactured by CUI Devices, rated at 700 mW with a frequency range of 400 Hz to 20 kHz and a sound pressure level of 91.5 dBA. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The rectangular top-ported configuration with solder pad termination serves applications requiring compact audio output in the specified impedance and power range.

Key Parameters

Parameter	CMS-15118-25-SP
Impedance	8 Ohms
Power - Rated	700 mW
Power - Max	1 W
Frequency Range	400 Hz ~ 20 kHz
Efficiency - dBA	91.50
Frequency - Self Resonant	500 Hz
Port Location	Top
Shape	Rectangular
Size / Dimension	0.591" L x 0.433" W (15.00mm x 11.00mm)
Height - Seated (Max)	0.098" (2.50mm)
Material - Cone	Polyester, Polyethylene Terephthalate (PET)
Material - Magnet	Nd-Fe-B
Termination	Solder Pads
Product Status	Obsolete
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the CMS-15118-25-SP is determined by the following critical parameters:

Impedance: 8 Ohms (exact match required)
Physical dimensions: 15.00mm x 11.00mm footprint (exact match required)
Port location: Top (exact match required)
Shape: Rectangular (exact match required)
Material composition: Polyester/PET cone and Nd-Fe-B magnet (exact match required)
Power handling: Rated power of 700 mW or greater
Frequency range: Minimum coverage of 400 Hz to 10 kHz or broader
Sound pressure level: 88 dBA or greater

The CMS-15118C-SP meets all mandatory substitution criteria while maintaining compatibility with the original design envelope and electrical specifications.

Parameter Comparison

Parameter	CMS-15118-25-SP	CMS-15118C-SP
Manufacturer	CUI Devices	CUI Devices
Series	CMS	CMS
Impedance	8 Ohms	8 Ohms
Power - Rated	700 mW	800 mW
Power - Max	1 W	1 W
Frequency Range	400 Hz ~ 20 kHz	400 Hz ~ 10 kHz
Frequency - Self Resonant	500 Hz	500 Hz
Efficiency - dBA	91.50	88.00
Port Location	Top	Top
Shape	Rectangular	Rectangular
Size / Dimension	0.591" L x 0.433" W (15.00mm x 11.00mm)	0.591" L x 0.433" W (15.00mm x 11.00mm)
Height - Seated (Max)	0.098" (2.50mm)	0.118" (3.00mm)
Material - Cone	Polyester, Polyethylene Terephthalate (PET)	Polyester, Polyethylene Terephthalate (PET)
Material - Magnet	Nd-Fe-B	Nd-Fe-B
Termination	Solder Pads	Spring Type
Type	General Purpose	Low Profile
Product Status	Obsolete	Active
RoHS Status	RoHS Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The CMS-15118C-SP is the qualified substitute for the obsolete CMS-15118-25-SP. Both components share identical impedance, footprint dimensions, port configuration, and magnetic material specifications. The substitute maintains active product status with ROHS3 compliance, ensuring continued availability and regulatory alignment.

Design considerations for substitution include termination type transition from solder pads to spring type connectors, which requires PCB layout modification. The substitute provides increased rated power capacity at 800 mW versus 700 mW, supporting higher power applications within the same form factor. Height increase from 2.50mm to 3.00mm must be verified against available assembly space. Frequency range reduction from 20 kHz to 10 kHz upper limit and efficiency decrease from 91.5 dBA to 88 dBA reflect the low-profile design trade-offs but remain within acceptable parameters for general purpose audio applications.

Frequently Asked Questions (FAQ)

Q: Can the CMS-15118C-SP directly replace the CMS-15118-25-SP without PCB modifications?

A: Footprint and impedance are identical, enabling direct electrical substitution. However, termination type differs: the original uses solder pads while the substitute uses spring type connectors. PCB layout modification is required to accommodate the alternative termination method.

Q: What is the impact of the 0.02" (0.50mm) height increase?

A: The CMS-15118C-SP seated height is 3.00mm compared to 2.50mm for the original. Verify available vertical clearance in the assembly to confirm compatibility with enclosure or component stacking constraints.

Q: Does the frequency range reduction from 20 kHz to 10 kHz affect audio performance?

A: The substitute maintains 400 Hz lower frequency coverage. The 10 kHz upper limit versus 20 kHz represents a narrower high-frequency response. Application requirements determine whether this reduction is acceptable for intended audio output characteristics.

Q: Are both components RoHS compliant?

A: Yes. The CMS-15118-25-SP is RoHS Compliant. The CMS-15118C-SP is ROHS3 Compliant, representing updated regulatory certification standards.

Q: What is the difference between the 91.5 dBA and 88 dBA efficiency ratings?

A: Both measurements use Sound Pressure Level (SPL) at specified power levels. The original achieves 91.5 dBA at 700mW/100mm while the substitute achieves 88 dBA at 800mW/100mm. The 4.6 dBA difference reflects acoustic design variations between general purpose and low-profile configurations.

Q: Is the CMS-15118C-SP available in the same packaging as the original?

A: The substitute is supplied in Tray packaging. Verify packaging requirements for your procurement and assembly processes.

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