SMT-4203D Equivalent & Substitute Parts

Part Overview

The SMT-4203D is a magnetic buzzer transducer manufactured by PUI Audio, Inc., designed as an externally driven electromechanical component in a 7.5mm x 7.5mm surface mount package with solder pad termination. This part is classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and ongoing production requirements. The SMT-4203D shares core mechanical and electrical characteristics with active product lines that can serve as direct functional replacements.

Substiute Parts

SMT-4203D

PUI Audio, Inc.In Stock: 1283SMT-4203D Datasheet

Current PartRFQ

SMT-0727-S-R

PUI Audio, Inc.In Stock: 5040SMT-0727-S-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The SMT-0727-S-R qualifies as a direct substitute for the SMT-4203D based on the following alignment of critical parameters:

• Identical footprint and mounting: Both parts share the 7.5mm x 7.5mm surface mount package with solder pad termination, enabling direct PCB layout compatibility
• Matching technology platform: Both utilize electromechanical/magnetic transducer technology with external drive circuitry
• Same series designation: Both belong to the PUI Audio SMT series, confirming design family compatibility
• Functional equivalence: Both are configured as externally driven buzzers suitable for identical application contexts

The SMT-0727-S-R is an active product with enhanced specifications including rated voltage (3.6V), operating frequency (2.7kHz), sound pressure level (85dB @ 3.6V, 10cm), and defined operating temperature range (-30°C ~ 70°C), making it a technically superior and production-viable replacement.

Parameter Comparison

Engineering Selection Recommendations

The SMT-0727-S-R is the appropriate substitute for the obsolete SMT-4203D based on the following engineering criteria:

• Product lifecycle status: The SMT-4203D is obsolete with no active manufacturing. The SMT-0727-S-R is an active product with confirmed production availability and supply chain continuity.
• Regulatory compliance: The SMT-0727-S-R achieves ROHS3 compliance, whereas the SMT-4203D is RoHS non-compliant. For applications subject to RoHS directives, the SMT-0727-S-R is the mandated choice.
• Mechanical compatibility: Identical footprint dimensions (7.5mm x 7.5mm) and solder pad termination ensure direct PCB layout compatibility. The height difference (0.079" vs. 0.106") must be evaluated for clearance constraints in the specific application enclosure.
• Functional equivalence: Both parts operate as externally driven electromechanical/magnetic transducers within the SMT series platform, confirming functional interchangeability for identical circuit topologies.

Frequently Asked Questions (FAQ)

Q: Can the SMT-0727-S-R be used as a direct replacement for the SMT-4203D without PCB redesign?

A: Yes, the SMT-0727-S-R maintains identical footprint dimensions (7.5mm x 7.5mm) and solder pad termination, enabling direct substitution on existing PCB layouts. However, the increased seated height (0.106" vs. 0.079") must be verified against enclosure clearance specifications.

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

A: The SMT-4203D lacks specified electrical parameters, whereas the SMT-0727-S-R provides complete specifications including 3.6V rated voltage, 2.7kHz frequency, 85dB SPL, and 120mA supply current. The SMT-0727-S-R is an active product with ROHS3 compliance; the SMT-4203D is obsolete and RoHS non-compliant.

Q: Are there any compatibility concerns with the voltage or current specifications?

A: The SMT-0727-S-R operates within a 2–5V range with a 120mA supply current requirement. Existing drive circuitry designed for the SMT-4203D must be evaluated to confirm compatibility with these specifications. The absence of electrical parameters for the SMT-4203D requires circuit-level validation.

Q: What is the impact of the height difference on assembly?

A: The SMT-0727-S-R has a maximum seated height of 0.106" compared to 0.079" for the SMT-4203D. This 0.027" increase must be assessed against enclosure internal dimensions and any components positioned above the buzzer to ensure no mechanical interference.

Q: Is the SMT-0727-S-R available in the same packaging format?

A: The SMT-0727-S-R is supplied in Tape & Reel (TR) packaging, which is standard for surface mount production. The SMT-4203D packaging format is not specified in the available data.