TUM-1842L-HD

Overview

The TUM-1842L-HD is an analog electret condenser microphone manufactured by PUI Audio, Inc. It features a unidirectional polar pattern and a compact 4mm diameter package designed for surface-mount applications. The device operates within a supply voltage range of 1.5 VDC to 10 VDC with a typical current consumption of 500 µA. It exhibits a sensitivity of -42 dB (±3dB) referenced at 94 dB SPL and maintains a frequency response spanning from 20 Hz to 20 kHz. The unit utilizes solder pad termination and presents an impedance of approximately 2.2 kohm.

Feature Summary

• Unidirectional acoustic design for focused sound capture
• Compact 4mm form factor suitable for space-constrained electronics
• Wide operating voltage range supporting various low-power systems
• Standard electret condenser technology for reliable audio conversion

Applications

• Consumer electronic devices requiring integrated voice input
• Industrial control panels with limited mounting space
• Medical equipment needing compact audio sensing components
• Security and fire alarm systems utilizing directional microphones

Procurement Notes

Verify the specific datasheet version provided by PUI Audio or authorized distributors to confirm exact mechanical dimensions and electrical tolerances. Ensure compatibility with the target PCB layout regarding solder pad placement and thermal requirements. Cross-reference the part number suffix to confirm the correct packaging format and termination style intended for the assembly process.

Selection Notes

Select this component when a unidirectional response is required to reject noise from the rear. The wide voltage tolerance allows integration into circuits ranging from low-voltage battery operation to higher voltage industrial supplies. Consider the 4mm size constraint and SMT termination method during the mechanical design phase to ensure proper fit and soldering reliability on the final printed circuit board.

Part Context

PUI Audio specializes in audio components including transducers, speakers, and microphones for medical, industrial, and consumer markets. The TUM series represents their line of compact analog microphones engineered for durability and consistent performance in demanding environments. This specific model integrates standard electret technology into a small footprint suitable for modern miniaturized electronics.

Replacement Considerations

Consult official substitution guides from PUI Audio for verified equivalent parts. Ensure any alternative maintains the same unidirectional pattern, 4mm diameter, and -42 dB sensitivity to preserve system acoustic performance without redesigning the enclosure or amplifier stage.

FAQ

What is the directivity pattern of the TUM-1842L-HD?

The TUM-1842L-HD features a unidirectional polar pattern, meaning it primarily captures sound from the front while rejecting noise from other directions.

Does this microphone require external biasing?

Yes, as an electret condenser microphone, it requires a DC supply voltage between 1.5 VDC and 10 VDC to operate the internal preamplifier.