SMI-158 Equivalent & Substitute Parts

Part Overview

The SMI-158 is a magnetic buzzer manufactured by PUI Audio, Inc., designed as an internally driven electromechanical indicator for 5V DC applications. This surface mount component operates at 2.4kHz and measures 12.5mm x 12.5mm with a seated height of 7.20mm maximum. The part is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production continuity.

Substiute Parts

SMI-158

PUI Audio, Inc.In Stock: 990SMI-158 Datasheet

Current PartRFQ

SMI-1324-TW-5V-R

PUI Audio, Inc.In Stock: 1055SMI-1324-TW-5V-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The SMI-1324-TW-5V-R qualifies as a direct substitute for the SMI-158 based on the following critical parameters:

• Identical rated voltage: 5V DC
• Identical operating frequency: 2.4kHz
• Identical technology: Electromechanical/Magnetic
• Identical driver circuitry: Indicator, Internally Driven
• Identical mounting type: Surface Mount
• Identical termination method: Solder Pads
• Identical footprint dimensions: 12.50mm x 12.50mm
• Identical seated height: 7.20mm maximum

The SMI-1324-TW-5V-R is the active production equivalent from the same manufacturer and series, providing functional and mechanical compatibility with the obsolete SMI-158.

Parameter Comparison

Engineering Selection Recommendations

The SMI-1324-TW-5V-R is the recommended substitute for the obsolete SMI-158. Both components share identical electrical specifications (5V rated voltage, 2.4kHz frequency), mechanical form factor (12.50mm x 12.50mm, 7.20mm height), and mounting characteristics (surface mount with solder pad termination).

The SMI-1324-TW-5V-R offers additional advantages: active product status ensures ongoing availability and supply chain continuity, ROHS3 compliance meets current regulatory requirements compared to the non-compliant SMI-158, and documented operating parameters (30mA supply current, 85dB SPL, -20°C to 70°C temperature range) provide enhanced design certainty. Both components maintain identical moisture sensitivity classification and regulatory export status.

Frequently Asked Questions (FAQ)

Q: Can the SMI-1324-TW-5V-R directly replace the SMI-158 in existing designs?

A: Yes. Both components are identical in rated voltage (5V), operating frequency (2.4kHz), technology (electromechanical/magnetic), mounting type (surface mount), termination method (solder pads), and physical dimensions (12.50mm x 12.50mm footprint, 7.20mm maximum seated height). No circuit modifications or PCB layout changes are required.

Q: What is the primary reason for substitution?

A: The SMI-158 is obsolete. The SMI-1324-TW-5V-R is the active production equivalent from PUI Audio, Inc., ensuring component availability and supply chain reliability.

Q: Are there compliance differences between these parts?

A: Yes. The SMI-1324-TW-5V-R is ROHS3 compliant, while the SMI-158 is RoHS non-compliant. Both maintain REACH Unaffected status and identical export classification (EAR99). For applications subject to RoHS requirements, the SMI-1324-TW-5V-R is the appropriate selection.

Q: What additional specifications are documented for the substitute part?

A: The SMI-1324-TW-5V-R provides specified operating parameters: supply current of 30mA, sound pressure level of 85dB at 5V measured at 10cm, operating temperature range of -20°C to 70°C, and single tone operating mode. The SMI-158 does not document these parameters.

Q: Are the packaging and moisture sensitivity characteristics equivalent?

A: Both components maintain Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling requirements. The SMI-1324-TW-5V-R is supplied in tube packaging, while the SMI-158 packaging specification is not provided.