SMT-901B Equivalent & Substitute Parts

Part Overview

The SMT-901B is a magnetic buzzer transducer manufactured by PUI Audio, Inc., designed for 5V surface mount applications. This component is an externally driven electromechanical buzzer intended for use in systems requiring audible signaling. The SMT-901B is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and production continuity.

Substiute Parts

SMT-901B

PUI Audio, Inc.In Stock: 918SMT-901B Datasheet

Current PartRFQ

SMT-0820-S-R

PUI Audio, Inc.In Stock: 1166SMT-0820-S-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The SMT-0820-S-R serves as a direct substitute for the SMT-901B based on the following alignment of critical parameters:

Matching Criteria:

• Manufacturer: PUI Audio, Inc. (same manufacturer)
• Series: SMT (same product series)
• Voltage - Rated: 5 V (identical rated voltage)
• Driver Circuitry: Transducer, Externally Driven (same driver type)
• Input Type: Zero-Peak Signal (same input signal type)
• Technology: Electromechanical/Magnetic (same technology platform)
• Mounting Type: Surface Mount (same mounting configuration)
• REACH Status: REACH Unaffected (same regulatory status)

The SMT-0820-S-R is an active product with enhanced specifications including defined frequency response (2kHz), sound pressure level (85dB @ 5V, 10cm), current supply (70mA), and operating temperature range (-30°C ~ 70°C). These specifications provide measurable performance characteristics absent from the obsolete SMT-901B.

Parameter Comparison

Engineering Selection Recommendations

The SMT-0820-S-R is the designated substitute for the obsolete SMT-901B. Selection of this substitute is supported by the following factors:

Product Status: The SMT-901B is obsolete, while the SMT-0820-S-R maintains active product status with ongoing manufacturer support and availability.

Regulatory Compliance: The SMT-0820-S-R achieves ROHS3 compliance, whereas the SMT-901B is RoHS non-compliant. For applications subject to RoHS directives, the SMT-0820-S-R satisfies current regulatory requirements.

Functional Equivalence: Both components share identical core specifications: 5V rated voltage, externally driven transducer architecture, zero-peak signal input type, and electromechanical/magnetic technology. The SMT-0820-S-R provides documented performance parameters (2kHz frequency, 85dB SPL, 70mA current, -30°C ~ 70°C operating range) that define its operational envelope.

Manufacturing Continuity: Both components are manufactured by PUI Audio, Inc., within the same SMT series, ensuring design consistency and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the SMT-0820-S-R directly replace the SMT-901B in existing designs?

A: Yes. Both components share the same rated voltage (5V), driver circuitry type (externally driven transducer), input signal type (zero-peak), technology platform (electromechanical/magnetic), and surface mount configuration. The SMT-0820-S-R is the manufacturer-designated substitute.

Q: What are the key differences between these two components?

A: The SMT-901B lacks published performance specifications. The SMT-0820-S-R provides defined parameters: 2kHz operating frequency, 85dB sound pressure level at 5V and 10cm distance, 70mA supply current, and -30°C to 70°C operating temperature range. Additionally, the SMT-0820-S-R is RoHS3 compliant while the SMT-901B is not.

Q: Does the SMT-0820-S-R have different physical dimensions?

A: The SMT-0820-S-R is specified as 8.50mm x 8.50mm with a maximum seated height of 4.50mm. The SMT-901B dimensions are not documented. Physical verification is necessary if space constraints exist in the application.

Q: What is the packaging format for the SMT-0820-S-R?

A: The SMT-0820-S-R is supplied in Tape & Reel (TR) packaging, standard for surface mount production environments.

Q: Are there any voltage or current considerations for substitution?

A: The SMT-0820-S-R operates within a 4V to 6V range with a 70mA supply current requirement. Designs using the SMT-901B must provide compatible voltage and current sourcing to the substitute component.

Q: What is the operating frequency of the substitute?

A: The SMT-0820-S-R operates at 2kHz with single-tone output mode. The SMT-901B frequency specification is not provided.