SPK0838HT4H-B Equivalent & Substitute Parts

Part Overview

The SPK0838HT4H-B is a MEMS digital PDM omnidirectional microphone manufactured by Knowles, part of the High-SNR SiSonic™ SPK series. This component operates across a 100 Hz to 10 kHz frequency range with -26dB ±3dB sensitivity at 94dB SPL and delivers 64dB signal-to-noise ratio. The device features solder pad termination in a compact 4.00mm × 3.00mm × 1.10mm rectangular package.

The SPK0838HT4H-B is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for applications utilizing this microphone.

Substiute Parts

SPK0838HT4H-B

KnowlesIn Stock: 3448SPK0838HT4H-B Datasheet

Current PartRFQ

SPK0641HT4H-1

KnowlesIn Stock: 692SPK0641HT4H-1 Datasheet

MFR RecommendedRFQ

MP34DT01

STMicroelectronicsIn Stock: 2259MP34DT01 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SPK0838HT4H-B are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Electrical Parameters: Output type (Digital, PDM), frequency range (100 Hz ~ 10 kHz), sensitivity (-26dB ±3dB @ 94dB SPL), and voltage range compatibility (1.6 V ~ 3.6 V or overlapping range).

Mechanical Parameters: MEMS silicon construction, omnidirectional pickup pattern, solder pad termination, and package dimensions (4.00mm × 3.00mm footprint with 1.10mm maximum height).

Regulatory Compliance: REACH Unaffected status and EAR99 ECCN classification.

The identified substitutes maintain these critical parameters while offering active product status and improved supply availability.

Parameter Comparison

Engineering Selection Recommendations

SPK0641HT4H-1 (Knowles): This substitute maintains Knowles manufacturer continuity and carries active product status with ROHS3 compliance. MSL rating of 1 (Unlimited) matches the original part's moisture handling capability. This option is recommended for applications prioritizing supply chain stability within the same manufacturer ecosystem.

MP34DT01 (STMicroelectronics): This substitute provides cross-manufacturer compatibility with identical package dimensions, frequency range, and sensitivity specifications. The MP34DT01 delivers lower supply current (600 µA versus 700 µA) and maintains active product status with ROHS3 compliance. The MSL rating of 3 (168 Hours) requires standard moisture control during storage and assembly. This option is suitable for applications where cross-manufacturer sourcing enhances supply resilience.

Both substitutes maintain the critical electrical and mechanical parameters required for PDM digital microphone functionality in omnidirectional applications.

Frequently Asked Questions (FAQ)

Q: Can SPK0641HT4H-1 and MP34DT01 be used interchangeably with SPK0838HT4H-B?

A: Both parts maintain the core functional parameters: Digital PDM output, omnidirectional pickup, 100 Hz to 10 kHz frequency range, -26dB ±3dB sensitivity, identical package footprint (4.00mm × 3.00mm), and solder pad termination. Electrical compatibility is confirmed within the specified voltage ranges. Physical interchangeability is supported by matching dimensions and port location (top).

Q: What is the significance of the MSL rating difference between substitutes?

A: SPK0641HT4H-1 carries MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. MP34DT01 carries MSL 3 (168 Hours), requiring standard moisture control during storage and assembly operations. Both ratings are within acceptable industry standards for MEMS microphone handling.

Q: How do the supply current specifications affect circuit design?

A: SPK0838HT4H-B and SPK0641HT4H-1 require 700 µA supply current. MP34DT01 operates at 600 µA, representing a 14% reduction in power consumption. This difference may be relevant for battery-powered or power-constrained applications but does not affect functional compatibility.

Q: Are all substitutes compliant with the same regulatory standards?

A: All three parts carry ECCN EAR99 classification and HTSUS code 8518.10.8030. SPK0641HT4H-1 and MP34DT01 are ROHS3 compliant. REACH Unaffected status is confirmed for SPK0838HT4H-B and MP34DT01. Verify specific regulatory requirements for your application region.

Q: Why is the original SPK0838HT4H-B marked as obsolete?

A: Obsolete status indicates the part is no longer manufactured or supported by Knowles. The identified substitutes provide equivalent functionality with active product status, ensuring long-term supply availability and manufacturer support.