AT-42 Equivalent & Substitute Parts

Part Overview

The AT-42 is a 32 Ohm general purpose speaker manufactured by PUI Audio, Inc., rated for 100 mW power with a frequency range of 600 Hz to 20 kHz and 70 dB SPL efficiency. This part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. The AT-42 features a top-mounted round port configuration with PC pin termination and Alnico magnet construction.

Substiute Parts

AT-42

PUI Audio, Inc.In Stock: 1155AT-42 Datasheet

Current PartRFQ

AST-03032MR-R

PUI Audio, Inc.In Stock: 1145AST-03032MR-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The AST-03032MR-R qualifies as a direct substitute for the AT-42 based on the following critical parameters:

• Impedance: Both parts are 32 Ohms, ensuring electrical compatibility with existing driver circuits
• Power Rating: Both rated at 100 mW with 200 mW maximum, maintaining thermal and electrical design margins
• Port Location and Shape: Both feature top-mounted round ports, ensuring mechanical fit in existing enclosures
• Size / Dimension: Both measure 1.181" diameter (30.00mm), confirming physical compatibility
• Termination: Both use PC pins, allowing direct connection without adapter modifications
• Material - Cone: Both use Polyester/PET cone material, maintaining acoustic characteristics

The AST-03032MR-R represents an active product with improved specifications and modern compliance certifications, making it the recommended substitute for the obsolete AT-42.

Parameter Comparison

Engineering Selection Recommendations

The AST-03032MR-R is the appropriate substitute for the AT-42 based on the following factors:

Product Status: The AT-42 is obsolete, while the AST-03032MR-R is an active product with ongoing manufacturer support and availability.

Compliance: The AST-03032MR-R meets ROHS3 compliance requirements, whereas the AT-42 is RoHS non-compliant. For applications subject to RoHS regulations, the AST-03032MR-R is mandatory.

Electrical Compatibility: Matching impedance (32 Ohms), power ratings (100 mW rated, 200 mW maximum), and termination (PC pins) ensure direct electrical substitution without circuit modifications.

Mechanical Compatibility: Identical diameter (30.00mm), top port location, and round shape confirm fit within existing mechanical assemblies. The height difference of 0.048" (1.20mm) must be verified against available mounting clearance in the application.

Acoustic Performance: The AST-03032MR-R provides 11 dB higher efficiency (81 dB versus 70 dB SPL), resulting in increased sound output at equivalent power levels. The frequency range shift from 600 Hz to 1.2 kHz minimum does not affect compatibility for applications requiring frequencies above 1.2 kHz.

Frequently Asked Questions (FAQ)

Q: Can the AST-03032MR-R be used as a direct replacement for the AT-42 without circuit modifications?

A: Yes. Both parts share identical impedance (32 Ohms), power ratings (100 mW rated), and PC pin termination. No circuit changes are required for electrical substitution.

Q: What is the impact of the height difference between these parts?

A: The AST-03032MR-R is 0.048" (1.20mm) taller than the AT-42 (0.520" versus 0.472" seated height). Verify that the application enclosure provides sufficient clearance above the speaker mounting surface.

Q: How does the magnet material change affect performance?

A: The AT-42 uses Alnico magnets while the AST-03032MR-R uses Nd-Fe-B magnets. Both are magnetic technologies suitable for general purpose speaker applications. The AST-03032MR-R achieves higher efficiency (81 dB versus 70 dB SPL) partly due to magnet material optimization.

Q: Is the AST-03032MR-R suitable for RoHS-regulated applications?

A: Yes. The AST-03032MR-R is ROHS3 compliant, making it suitable for applications subject to RoHS directives. The AT-42 is RoHS non-compliant and should not be used in regulated environments.

Q: What is the frequency range difference, and does it affect compatibility?

A: The AT-42 operates from 600 Hz to 20 kHz, while the AST-03032MR-R operates from 1.2 kHz to 20 kHz. For applications requiring response below 1.2 kHz, the AT-42 provides broader low-frequency coverage. For applications operating above 1.2 kHz, both parts are compatible.

Q: Are there packaging differences between these parts?

A: The AT-42 packaging is unspecified, while the AST-03032MR-R is supplied in Tray packaging. Confirm packaging requirements with your procurement process.