SPH1642HT5H-1 Equivalent & Substitute Parts

Part Overview

The SPH1642HT5H-1 is an analog MEMS microphone manufactured by Knowles, part of the SiSonic™ SPH series. This omnidirectional microphone operates across a 50 Hz to 10 kHz frequency range with a sensitivity of -38dB ±1dB at 94dB SPL, designed for applications requiring compact analog audio capture with low power consumption. The product is currently obsolete, making identification of compatible substitute components essential for ongoing design support, production continuity, and system maintenance.

Key Parameters

Parameter	SPH1642HT5H-1
Manufacturer	Knowles
Type	MEMS (Silicon)
Output Type	Analog
Direction	Omnidirectional
Frequency Range	50 Hz ~ 10 kHz
Sensitivity	-38dB ±1dB @ 94dB SPL
S/N Ratio	65dB
Impedance	500 Ohms
Voltage Range	1.5 V ~ 3.6 V
Current - Supply	185 µA
Termination	Solder Pads
Size / Dimension	0.138" L x 0.104" W (4.60mm x 2.65mm)
Height (Max)	0.043" (1.10mm)
RoHS Status	RoHS Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the SPH1642HT5H-1 is determined by the following critical parameters:

Microphone Type: MEMS (Silicon) analog output only
Directional Pattern: Omnidirectional
Sensitivity: -38dB ±1dB (matching acoustic output level)
Frequency Response: Minimum 50 Hz lower bound; 10 kHz upper limit
Voltage Compatibility: 1.5 V ~ 3.6 V operating range
Physical Form Factor: 4.60mm x 2.65mm footprint with solder pad termination
Compliance: RoHS compliant

The CMM-3526AT-38165-TR from CUI Devices meets these substitution criteria with the following considerations: frequency response begins at 100 Hz (higher than the original 50 Hz), impedance is 200 Ohms (lower than 500 Ohms), and supply current is 170 µA (lower than 185 µA). These variations remain within acceptable tolerance for analog MEMS microphone applications maintaining equivalent acoustic performance and form factor compatibility.

Parameter Comparison

Parameter	SPH1642HT5H-1 (Knowles)	CMM-3526AT-38165-TR (CUI Devices)
Type	MEMS (Silicon)	MEMS (Silicon)
Output Type	Analog	Analog
Direction	Omnidirectional	Omnidirectional
Frequency Range	50 Hz ~ 10 kHz	100 Hz ~ 10 kHz
Sensitivity	-38dB ±1dB @ 94dB SPL	-38dB ±1dB
S/N Ratio	65dB	65dB
Impedance	500 Ohms	200 Ohms
Voltage Range	1.5 V ~ 3.6 V	1.5 V ~ 3.6 V
Current - Supply	185 µA	170 µA
Termination	Solder Pads	Solder Pads
Size / Dimension	0.138" L x 0.104" W (4.60mm x 2.65mm)	0.138" L x 0.104" W (4.60mm x 2.65mm)
Height (Max)	0.043" (1.10mm)	0.039" (1.00mm)
RoHS Status	RoHS Compliant	RoHS Compliant
Product Status	Obsolete	Active

Engineering Selection Recommendations

The CMM-3526AT-38165-TR is the qualified substitute for the obsolete SPH1642HT5H-1. Selection is supported by:

Product Status: The substitute is active and in production, ensuring long-term availability and supply chain continuity.
Compliance Alignment: Both components are RoHS compliant, maintaining regulatory requirements for new designs and production runs.
Form Factor Compatibility: Identical footprint (4.60mm x 2.65mm) and solder pad termination enable direct PCB layout reuse without redesign.
Electrical Compatibility: Matching voltage range (1.5 V ~ 3.6 V), identical sensitivity (-38dB ±1dB), and equivalent S/N ratio (65dB) ensure functional equivalence in audio signal chain applications.
Performance Characteristics: Lower impedance (200 Ohms vs. 500 Ohms) and reduced supply current (170 µA vs. 185 µA) provide marginal improvements in power efficiency and signal conditioning simplicity.

The 100 Hz lower frequency bound of the substitute (versus 50 Hz for the original) represents the only functional deviation and is acceptable for applications where sub-100 Hz response is not required.

Frequently Asked Questions (FAQ)

Q: Can the CMM-3526AT-38165-TR be used as a direct replacement for the SPH1642HT5H-1 without PCB modifications?

A: Yes. Both components share identical footprint dimensions (4.60mm x 2.65mm), solder pad termination, and voltage operating range (1.5 V ~ 3.6 V). No PCB layout changes are required for mechanical or electrical integration.

Q: What is the impact of the 100 Hz lower frequency limit on the CMM-3526AT-38165-TR compared to the 50 Hz specification of the SPH1642HT5H-1?

A: The substitute begins frequency response at 100 Hz instead of 50 Hz. This affects only applications requiring capture or processing of audio content below 100 Hz. For standard voice and general audio applications, this difference is not functionally significant.

Q: Are there impedance differences between these components, and do they affect circuit design?

A: The SPH1642HT5H-1 has 500 Ohm impedance while the CMM-3526AT-38165-TR has 200 Ohm impedance. This lower impedance in the substitute may reduce signal attenuation in long cable runs and simplifies impedance matching in analog signal conditioning circuits. Existing designs will function without modification.

Q: What is the packaging difference between these parts?

A: The SPH1642HT5H-1 is supplied in standard packaging, while the CMM-3526AT-38165-TR is supplied in Tape & Reel (TR) format. Tape & Reel packaging is standard for high-volume production and automated assembly processes.

Q: Why is the SPH1642HT5H-1 listed as obsolete?

A: Knowles has discontinued the SPH1642HT5H-1 from their product line. The CMM-3526AT-38165-TR from CUI Devices is the active equivalent that maintains functional and mechanical compatibility for ongoing production and design support.

Q: Are both components RoHS compliant?

A: Yes. Both the SPH1642HT5H-1 and CMM-3526AT-38165-TR are RoHS compliant, meeting regulatory requirements for electronic component manufacturing and use in regulated markets.

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