AI-400 Equivalent & Substitute Parts Reference

Part Overview

The AI-400 is a through-hole piezo buzzer manufactured by PUI Audio, Inc., rated for 12V DC operation with internally driven indicator circuitry. This component is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations. The AI-400 serves as an audible indicator in applications requiring piezo-based alert signaling with through-hole PC pin termination.

Substiute Parts

AI-400

PUI Audio, Inc.In Stock: 1149AI-400 Datasheet

Current PartRFQ

AI-4228-TWT-R

PUI Audio, Inc.In Stock: 2520AI-4228-TWT-R Datasheet

DirectRFQ

SBM428

Mallory Sonalert Products Inc.In Stock: 958SBM428 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AI-400 are identified based on the following critical parameters that determine functional and mechanical compatibility:

Primary Compatibility Criteria:

• Technology: Piezo
• Driver Circuitry: Indicator, Internally Driven
• Input Type: DC
• Mounting Type: Through Hole
• Termination: PC Pins
• Voltage Compatibility: Rated or operating range includes 12V

Substitute Classification:

Direct Substitute (Preferred): AI-4228-TWT-R maintains identical manufacturer lineage (PUI Audio, Inc.), series compatibility (AI), and enhanced specifications. This part operates at the same 12V rated voltage with extended voltage range capability (3–28V), ensuring drop-in compatibility for existing designs.

Similar Substitute (Alternative): SBM428 from Mallory Sonalert Products Inc. provides functional equivalence through matching piezo technology, internally driven indicator circuitry, and through-hole PC pin termination. Operating voltage range (4–28V) encompasses the 12V requirement, though frequency and sound pressure level characteristics differ from the original specification.

Parameter Comparison

Engineering Selection Recommendations

AI-4228-TWT-R Selection Rationale:

The AI-4228-TWT-R is the primary substitute for the obsolete AI-400. Both components share manufacturer origin (PUI Audio, Inc.) and series designation (AI), ensuring design continuity. The AI-4228-TWT-R maintains 12V rated voltage operation with extended voltage range (3–28V), providing superior flexibility for power supply variations. This part achieves ROHS3 compliance, addressing regulatory requirements absent in the original AI-400. Active product status ensures long-term availability and supply chain stability. Mechanical compatibility is confirmed through identical through-hole PC pin termination and comparable form factor (42.00mm diameter, 14.50mm height).

SBM428 Selection Rationale:

The SBM428 serves as an alternative substitute when AI-4228-TWT-R availability is constrained. This Mallory Sonalert Products component maintains functional equivalence through piezo technology, internally driven indicator circuitry, and through-hole PC pin termination. Operating voltage range (4–28V) encompasses the 12V requirement. ROHS3 compliance and active product status support modern design standards and supply chain reliability. Mechanical dimensions (42.85mm diameter, 17.37mm height) are comparable to the AI-400, though slightly larger. Frequency characteristics (2.9kHz) and current consumption (3–16mA) differ from the AI-4228-TWT-R, requiring circuit validation in applications with strict acoustic or power specifications.

Frequently Asked Questions (FAQ)

Q: Can the AI-4228-TWT-R directly replace the AI-400 without circuit modification?

A: Yes. Both components operate at 12V DC with internally driven indicator circuitry, through-hole PC pin termination, and piezo technology. The AI-4228-TWT-R's extended voltage range (3–28V) ensures compatibility with existing power supplies designed for the AI-400.

Q: What are the key differences between AI-4228-TWT-R and SBM428?

A: Both are functionally equivalent piezo buzzers with internally driven indicator circuitry and through-hole PC pin termination. Primary differences include manufacturer (PUI Audio vs. Mallory Sonalert), frequency (2.8kHz vs. 2.9kHz), sound pressure level (99dB vs. 64dB at different measurement conditions), current consumption (10mA vs. 3–16mA), and operating temperature range (-30°C to 85°C vs. -30°C to 65°C).

Q: Are both substitute parts RoHS compliant?

A: Yes. Both AI-4228-TWT-R and SBM428 are ROHS3 compliant, whereas the original AI-400 is RoHS non-compliant. This compliance upgrade supports modern manufacturing and regulatory requirements.

Q: Will the SBM428 fit in the same PCB footprint as the AI-400?

A: The SBM428 has comparable but slightly larger dimensions (42.85mm diameter vs. unspecified AI-400 dimensions, 17.37mm height). Verify PCB layout clearance before substitution, particularly for height-constrained applications.

Q: What is the current consumption difference between substitutes?

A: The AI-4228-TWT-R draws 10mA at 12V operation. The SBM428 operates at 3–16mA depending on applied voltage. For power-sensitive applications, the AI-4228-TWT-R provides predictable current draw at 12V.

Q: Can either substitute operate at voltages outside 12V?

A: Yes. The AI-4228-TWT-R operates across 3–28V, and the SBM428 operates across 4–28V. Both maintain functionality across this extended range, though acoustic output and current consumption vary with applied voltage.