AT-20 Equivalent & Substitute Parts

Part Overview

The AT-20 is a through-hole piezo buzzer transducer manufactured by PUI Audio, Inc., designed as an externally driven piezo acoustic component. This part is classified as obsolete, making identification of compatible substitute components essential for ongoing production, maintenance, and design continuity. The AT-20 operates as a passive transducer requiring external drive circuitry, distinguishing it from self-oscillating buzzer designs. Substitute parts must maintain functional equivalence in mounting configuration, termination style, and transducer technology to ensure direct replacement capability.

Substiute Parts

AT-20

PUI Audio, Inc.In Stock: 851AT-20 Datasheet

Current PartRFQ

AT-2440-TWT-R

PUI Audio, Inc.In Stock: 7353AT-2440-TWT-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The AT-2440-TWT-R qualifies as a direct substitute for the AT-20 based on the following critical parameters:

Substitution Criteria:

• Same manufacturer (PUI Audio, Inc.)
• Same series designation (AT)
• Identical technology platform (Piezo)
• Identical driver circuitry classification (Transducer, Externally Driven)
• Identical mounting configuration (Through Hole)
• Identical termination style (PC Pins)
• Compatible regulatory classification (ECCN: EAR99, HTSUS: 8531.80.9041)

The AT-2440-TWT-R represents an active product with enhanced specifications including defined voltage rating (3V), frequency (4kHz), sound pressure level (80dB @ 3V, 10cm), and operating temperature range (-20°C ~ 60°C). These specifications provide measurable performance parameters absent from the AT-20 datasheet, enabling precise application matching while maintaining core functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

The AT-2440-TWT-R is the designated substitute for the obsolete AT-20. Selection of this substitute is supported by:

Product Status Alignment: The AT-20 is obsolete; the AT-2440-TWT-R is active and currently manufactured, ensuring supply chain continuity and long-term availability.

Regulatory Compliance: The AT-2440-TWT-R achieves ROHS3 compliance, representing an improvement over the AT-20's RoHS non-compliant status. Both components maintain identical ECCN (EAR99) and HTSUS (8531.80.9041) classifications, ensuring consistent export and tariff treatment.

Functional Equivalence: Both components employ identical piezo transducer technology with externally driven architecture, through-hole mounting, and PC pin termination. This structural equivalence ensures mechanical and electrical compatibility within existing PCB designs.

Specification Definition: The AT-2440-TWT-R provides explicit operational parameters (3V rated voltage, 4kHz frequency, 80dB SPL, 1mA supply current, -20°C ~ 60°C operating range) enabling precise application verification. These specifications define the performance envelope within which the substitute operates.

Frequently Asked Questions (FAQ)

Q: Can the AT-2440-TWT-R directly replace the AT-20 in existing designs?

A: Yes. Both components share identical mounting type (through-hole), termination style (PC pins), technology platform (piezo), and driver architecture (externally driven transducer). PCB footprints and circuit interface requirements remain compatible. The AT-2440-TWT-R's defined 24mm diameter and 7.70mm seated height should be verified against original AT-20 mechanical specifications if available.

Q: What is the primary reason for substitution?

A: The AT-20 is classified as obsolete. The AT-2440-TWT-R is an active product from the same manufacturer and series, ensuring continued availability and supply chain reliability.

Q: Does the AT-2440-TWT-R meet modern regulatory requirements?

A: Yes. The AT-2440-TWT-R achieves ROHS3 compliance, exceeding the AT-20's RoHS non-compliant status. Both components maintain identical REACH Unaffected and EAR99 classifications.

Q: What are the key electrical parameters of the AT-2440-TWT-R?

A: Rated voltage is 3V with operational range of 1 ~ 30V. Operating frequency is 4kHz in single-tone mode. Supply current is 1mA. Sound pressure level is 80dB measured at 3V, 10cm distance. Operating temperature range is -20°C ~ 60°C.

Q: Are there packaging differences between these components?

A: The AT-20 packaging is not specified. The AT-2440-TWT-R is supplied in tray packaging. Verify packaging requirements for your procurement and assembly processes.

Q: What is the physical size of the AT-2440-TWT-R?

A: Diameter is 0.945 inches (24.00mm). Maximum seated height is 0.303 inches (7.70mm). These dimensions should be confirmed compatible with original AT-20 mechanical constraints.