AI-257 Equivalent & Substitute Parts

Part Overview

The AI-257 is a piezo buzzer indicator manufactured by PUI Audio, Inc., designed for 12V DC applications with a 3.2kHz operating frequency. This component features internally driven circuitry and through-hole PC pin termination for direct PCB mounting. The AI-257 is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and production continuity.

Substiute Parts

AI-257

PUI Audio, Inc.In Stock: 1130AI-257 Datasheet

Current PartRFQ

AI-2331-TWT-2-R

PUI Audio, Inc.In Stock: 1443AI-2331-TWT-2-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The AI-2331-TWT-2-R qualifies as a direct substitute for the AI-257 based on the following critical parameters:

• Rated Voltage: Both parts operate at 12V DC
• Frequency: Both parts maintain 3.2kHz operating frequency
• Technology: Both utilize piezo technology
• Driver Circuitry: Both feature internally driven indicator circuitry
• Input Type: Both accept DC input
• Mounting Type: Both use through-hole mounting
• Termination: Both use PC pins for PCB connection
• Manufacturer: Both are manufactured by PUI Audio, Inc., within the same AI series

The AI-2331-TWT-2-R provides enhanced specifications including defined voltage range (3–20V), measurable current supply (13mA), sound pressure level (85dB @ 12V, 10cm), operating temperature range (−30°C to 85°C), and RoHS3 compliance, while maintaining full compatibility with the original AI-257 electrical and mechanical interface requirements.

Parameter Comparison

Engineering Selection Recommendations

The AI-2331-TWT-2-R is the designated substitute for the obsolete AI-257. Selection of this part is based on:

• Product Status Alignment: The AI-2331-TWT-2-R maintains active production status, ensuring long-term availability and supply chain continuity.
• Electrical Compatibility: Identical rated voltage (12V), frequency (3.2kHz), and DC input type ensure direct functional replacement without circuit modification.
• Mechanical Compatibility: Matching through-hole mounting and PC pin termination allow direct PCB footprint compatibility.
• Regulatory Compliance: The AI-2331-TWT-2-R achieves ROHS3 compliance, addressing modern regulatory requirements that the obsolete AI-257 does not meet.
• Enhanced Specifications: The substitute provides documented operating parameters (current, SPL, temperature range) that support design validation and thermal management planning.

Frequently Asked Questions (FAQ)

Q: Can the AI-2331-TWT-2-R be used as a direct replacement for the AI-257 without PCB modification?

A: Yes. Both parts share identical electrical ratings (12V, 3.2kHz), driver circuitry (internally driven indicator), and mechanical interface (through-hole PC pins). No circuit or layout changes are required.

Q: What is the primary reason for substitution?

A: The AI-257 is classified as obsolete. The AI-2331-TWT-2-R is an active production part from the same manufacturer and series, providing equivalent functionality with documented specifications and regulatory compliance.

Q: Are there differences in physical dimensions between these parts?

A: The AI-257 does not specify dimensional data. The AI-2331-TWT-2-R is documented as 0.917" diameter (23.30mm) with a maximum seated height of 0.421" (10.70mm). Verify PCB layout clearance if space constraints exist.

Q: Does the AI-2331-TWT-2-R meet current regulatory requirements?

A: Yes. The AI-2331-TWT-2-R is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards. The obsolete AI-257 does not carry these certifications.

Q: What is the operating temperature range for the substitute part?

A: The AI-2331-TWT-2-R operates from −30°C to 85°C. The AI-257 does not specify an operating temperature range.

Q: Is the supply current specification important for circuit design?

A: Yes. The AI-2331-TWT-2-R draws 13mA at rated voltage. Verify that power supply and current-limiting circuitry can accommodate this specification. The AI-257 does not provide current data.