AI-390 Piezo Buzzer 24V 42MM Panel Mount - Equivalent & Substitute Parts

Part Overview

The AI-390 is an internally driven piezo buzzer rated for 24V DC operation with a 42mm panel mount form factor and solder tab termination. This component is classified as obsolete, necessitating identification of active equivalent parts that maintain functional compatibility for new designs or replacement applications. The buzzer operates at 2.9kHz and is designed for indicator applications requiring audible feedback in industrial and electronic equipment.

Substiute Parts

AI-390

PUI Audio, Inc.In Stock: 1137AI-390 Datasheet

Current PartRFQ

AI-4230-S-C24-R

PUI Audio, Inc.In Stock: 879AI-4230-S-C24-R Datasheet

DirectRFQ

SNP428

Mallory Sonalert Products Inc.In Stock: 1034SNP428 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AI-390 is determined by the following critical parameters:

• Frequency Match: 2.9kHz operation
• Technology: Piezo, internally driven
• Mounting: Panel mount configuration
• Input Type: DC operation
• Voltage Compatibility: Rated or operating range must accommodate 24V

Two substitute parts meet these criteria with varying degrees of parameter alignment:

AI-4230-S-C24-R (PUI Audio, Inc.) maintains identical frequency, technology, mounting type, and termination compatibility while offering active product status and enhanced specifications including rated voltage of 24V with extended operating range (1–28V), documented sound pressure level (95dB @ 24V, 10cm), and RoHS3 compliance.

SNP428 (Mallory Sonalert Products Inc.) provides frequency and technology equivalence with panel mount configuration and active product status. This part operates across a 4–28V range, encompassing the 24V requirement, and includes UL approval and RoHS3 compliance. Termination differs (screw terminal and quick connect tab versus solder tabs) and dimensional variance exists (41.66mm diameter, 23.03mm height).

Parameter Comparison

Engineering Selection Recommendations

AI-4230-S-C24-R is the primary substitute for the AI-390. This part is manufactured by the same supplier (PUI Audio, Inc.), maintains identical mechanical dimensions and termination type (solder tabs), and operates at the same frequency. The part carries active product status and RoHS3 compliance, addressing regulatory requirements for modern applications. The rated voltage of 24V with extended operating range (1–28V) ensures direct compatibility with the original specification.

SNP428 serves as a secondary substitute when mechanical or termination constraints permit. This part maintains frequency equivalence and piezo technology, with active product status and UL approval. The 4–28V operating range encompasses 24V operation. Substitution requires accommodation of different termination (screw terminal and quick connect tab), slightly different dimensions (41.66mm diameter, 23.03mm height versus 42mm and 21mm), and lower documented sound pressure level (64dB @ 4V, 61cm versus 95dB @ 24V, 10cm for the AI-4230-S-C24-R).

Both substitute parts provide RoHS3 compliance, addressing environmental and regulatory requirements absent in the obsolete AI-390.

Frequently Asked Questions (FAQ)

Q: Can the AI-4230-S-C24-R directly replace the AI-390 in existing designs?

A: Yes. The AI-4230-S-C24-R maintains identical rated voltage (24V), frequency (2.9kHz), mounting type (panel mount), termination (solder tabs), and mechanical dimensions (42mm diameter, 21mm height). No circuit or mechanical modifications are required.

Q: What are the key differences between AI-4230-S-C24-R and SNP428?

A: Both parts operate at 2.9kHz with piezo technology and panel mount configuration. AI-4230-S-C24-R uses solder tab termination with 42mm diameter and 21mm height, while SNP428 uses screw terminal and quick connect tab termination with 41.66mm diameter and 23.03mm height. SNP428 includes UL approval; AI-4230-S-C24-R does not specify approval agency. Sound pressure levels differ: 95dB @ 24V, 10cm (AI-4230-S-C24-R) versus 64dB @ 4V, 61cm (SNP428).

Q: Are both substitute parts RoHS compliant?

A: Yes. Both AI-4230-S-C24-R and SNP428 carry RoHS3 compliance status, whereas the original AI-390 is RoHS non-compliant.

Q: What voltage range do the substitute parts support?

A: AI-4230-S-C24-R operates across 1–28V. SNP428 operates across 4–28V. Both ranges encompass the 24V rated voltage of the original AI-390.

Q: Can SNP428 be used if panel mount dimensions must remain unchanged?

A: SNP428 has slightly different dimensions (41.66mm diameter, 23.03mm height) compared to the AI-390 (42mm diameter, 21mm height). Panel mount hole spacing and height clearance must be evaluated for mechanical compatibility.

Q: What is the current consumption of each substitute part?

A: AI-4230-S-C24-R draws 15mA at rated voltage. SNP428 draws 3–16mA across its operating range. The original AI-390 does not specify current consumption.