SMDA15.TBT Equivalent & Substitute Parts

Part Overview

The SMDA15.TBT is a transient voltage suppressor (TVS) diode manufactured by Semtech Corporation, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 15V reverse standoff voltage with 30V clamping capability and 10A peak pulse current handling (8/20µs). The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.

Substiute Parts

SMDA15.TBT

Semtech CorporationIn Stock: 2753SMDA15.TBT Datasheet

Current PartRFQ

SMDA15

SMC Diode SolutionsIn Stock: 2213SMDA15 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMDA15.TBT is determined by the following critical parameters:

• Voltage Rating Match: Reverse standoff voltage of 15V (Max) and breakdown voltage minimum of 16.7V
• Package Compatibility: 8-SOIC surface-mount package with 0.154" width (3.90mm)
• Channel Configuration: 4 unidirectional channels
• Operating Temperature Range: -55°C to 125°C
• Diode Type: Zener TVS configuration

The SMDA15 from SMC Diode Solutions meets these core substitution criteria. While the clamping voltage differs (24V versus 30V) and peak pulse current is reduced (1A versus 10A), the part maintains identical voltage standoff and breakdown specifications, package form factor, and temperature operating range. This represents a functional substitute for applications where the lower clamping voltage and reduced current rating are acceptable within the circuit design constraints.

Parameter Comparison

Engineering Selection Recommendations

The SMDA15 from SMC Diode Solutions is an active-status substitute for the obsolete SMDA15.TBT. Selection between these parts should be based on the following factors:

Product Status: The SMDA15.TBT is obsolete; the SMDA15 is active and currently in production, ensuring long-term availability and supply chain continuity.

Compliance & Certifications: The SMDA15 carries ROHS3 compliance and REACH affected status, providing enhanced environmental and regulatory alignment compared to the original RoHS Compliant designation of the SMDA15.TBT.

Packaging: The SMDA15 is supplied in Tape & Reel (TR) format, suitable for automated assembly processes, whereas the original part packaging specification is not detailed.

Performance Variations: The SMDA15 exhibits lower peak pulse current (1A versus 10A) and reduced clamping voltage (24V versus 30V). These differences must be evaluated against circuit requirements. The increased capacitance (140pF versus 100pF) may affect high-frequency performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can the SMDA15 directly replace the SMDA15.TBT in all applications?

A: Direct replacement is possible only when circuit design tolerates the lower peak pulse current rating (1A versus 10A) and reduced clamping voltage (24V versus 30V). Voltage standoff and breakdown specifications are identical, and the 8-SOIC package is mechanically compatible. Verify that transient energy levels do not exceed the substitute part's 1A current capability.

Q: What is the significance of the clamping voltage difference?

A: Clamping voltage determines the maximum voltage the TVS diode allows across the protected circuit during a transient event. The SMDA15.TBT clamps at 30V maximum, while the SMDA15 clamps at 24V. Lower clamping voltage provides tighter protection but may be unsuitable for circuits designed around the original 30V specification.

Q: How does the capacitance difference affect circuit performance?

A: The SMDA15 exhibits 140pF capacitance at 1MHz compared to 100pF for the SMDA15.TBT. Higher capacitance may introduce additional loading on high-frequency signal lines. Evaluate impact on signal integrity and impedance matching in sensitive applications.

Q: Are the packages truly interchangeable?

A: Yes. Both parts use the 8-SOIC package with 0.154" width (3.90mm). Pin-to-pin compatibility and PCB footprint are identical, enabling direct physical substitution without layout modifications.

Q: What compliance advantages does the SMDA15 offer?

A: The SMDA15 meets ROHS3 and REACH compliance standards, providing enhanced environmental regulatory alignment. The original SMDA15.TBT carries RoHS Compliant status. Both parts maintain identical operating temperature ranges (-55°C to 125°C) and moisture sensitivity levels (MSL 1 - Unlimited).

Q: Is the 1A peak pulse current sufficient for my application?

A: This depends on transient energy levels in your circuit. If the original design operated at or near the 10A limit, the 1A substitute may be inadequate. If typical transient currents remain well below 1A, the substitute is suitable. Conduct transient analysis to confirm compatibility.