SMI-168 Equivalent & Substitute Parts

Part Overview

The SMI-168 is an internally driven electromechanical magnetic buzzer rated at 12V with surface mount solder pad termination and 12.5mm x 12.5mm footprint dimensions. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The SMI-168 belongs to PUI Audio's SMI series of indicator buzzers designed for DC-powered applications requiring audible signaling in compact form factors.

Substiute Parts

SMI-168

PUI Audio, Inc.In Stock: 941SMI-168 Datasheet

Current PartRFQ

SMI-1324-TW-12V-R

PUI Audio, Inc.In Stock: 1130SMI-1324-TW-12V-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The SMI-1324-TW-12V-R qualifies as a direct substitute for the SMI-168 based on the following alignment of critical parameters:

• Identical manufacturer (PUI Audio, Inc.) and series designation (SMI)
• Matching rated voltage (12V) with compatible voltage range (8–15V) that encompasses the original specification
• Identical mounting type (Surface Mount) and termination method (Solder Pads)
• Identical physical footprint (12.50mm x 12.50mm) and maximum seated height (7.20mm)
• Same technology classification (Electromechanical/Magnetic) and driver circuitry type (Indicator, Internally Driven)
• Identical input type (DC)

The SMI-1324-TW-12V-R represents an active product with enhanced specifications including defined frequency (2.4kHz), sound pressure level (85dB @ 12V, 10cm), current consumption (30mA), and operating temperature range (−20°C to 70°C). These additional parameters do not conflict with the original SMI-168 requirements and provide measurable performance characteristics for system integration.

Parameter Comparison

Engineering Selection Recommendations

The SMI-1324-TW-12V-R is the direct substitute for the obsolete SMI-168. Selection of this substitute is supported by:

• Active product status ensuring ongoing availability and manufacturing support
• ROHS3 compliance of the substitute versus non-compliance of the original part, providing regulatory advantage for new designs and production batches
• Identical mechanical and electrical interface specifications (footprint, height, voltage rating, mounting, termination)
• Maintained REACH Unaffected and EAR99 classification status
• Identical moisture sensitivity level (MSL 1) and handling requirements

No design modifications to PCB layouts, connector interfaces, or power supply specifications are required for substitution. The substitute part operates within the same electrical envelope as the original specification.

Frequently Asked Questions (FAQ)

Q: Can the SMI-1324-TW-12V-R be used as a direct replacement for the SMI-168 without PCB modifications?

A: Yes. Both parts share identical mounting type (Surface Mount), termination method (Solder Pads), physical dimensions (12.50mm x 12.50mm footprint, 7.20mm maximum height), and rated voltage (12V). No PCB layout changes are required.

Q: What is the difference in RoHS compliance between these parts?

A: The SMI-168 is RoHS non-compliant, while the SMI-1324-TW-12V-R is ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the substitute part provides regulatory compliance.

Q: Are the electrical operating parameters of the SMI-1324-TW-12V-R compatible with systems designed for the SMI-168?

A: Yes. The substitute part maintains the 12V rated voltage specification and operates within the same DC input type and internally driven indicator circuitry classification. The voltage range of 8–15V encompasses typical 12V system tolerances.

Q: What is the current consumption of the SMI-1324-TW-12V-R?

A: The substitute part draws 30mA at rated voltage. This specification was not provided for the original SMI-168. System power budgets should account for this 30mA requirement.

Q: Are moisture sensitivity and handling requirements identical between the two parts?

A: Yes. Both parts are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions and no special storage or handling requirements.

Q: What is the sound output specification of the SMI-1324-TW-12V-R?

A: The substitute part produces 85dB sound pressure level at 12V measured at 10cm distance, with a single tone frequency of 2.4kHz. The original SMI-168 did not specify these acoustic parameters.