SM8LC15/TR7 Equivalent & Substitute Parts

Part Overview

The SM8LC15/TR7 is a bidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This surface-mount component operates with a 15V reverse standoff voltage and provides 30V clamping at peak pulse current. The device is classified as Active product status and is currently available in inventory.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter set, enabling procurement flexibility and supply chain continuity.

Substiute Parts

SM8LC15/TR7

Microchip TechnologyIn Stock: 909SM8LC15/TR7 Datasheet

Current PartRFQ

LCDA15.TBT

Semtech CorporationIn Stock: 1898LCDA15.TBT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SM8LC15/TR7 is determined by matching the following critical electrical and mechanical parameters:

• Voltage Rating: Reverse standoff voltage of 15V and breakdown voltage minimum of 16.7V
• Clamping Performance: Maximum clamping voltage of 30V at peak pulse current
• Peak Pulse Current: 5A rating at 8/20µs pulse duration
• Bidirectional Channels: 2-channel configuration
• Package Compatibility: 8-SOIC surface-mount package with 0.154" (3.90mm) width
• Mounting Type: Surface mount technology

The LCDA15.TBT from Semtech Corporation satisfies all critical substitution criteria within the allowed parameter tolerances for this TVS diode category.

Parameter Comparison

Engineering Selection Recommendations

SM8LC15/TR7 (Microchip Technology)

Select this part when the application requires the extended operating temperature range of -55°C to 150°C (TJ) and higher peak pulse power dissipation of 500W. This device is suitable for high-temperature environments and applications with elevated transient energy levels. Note that this part carries RoHS non-compliant status.

LCDA15.TBT (Semtech Corporation)

Select this substitute part when RoHS3 compliance is required for the end application. The LCDA15.TBT maintains electrical equivalence across all critical voltage and current parameters. The operating temperature range is limited to -55°C to 125°C (TJ), and peak pulse power is rated at 300W. This part is appropriate for applications operating within the specified temperature constraints and where regulatory compliance with ROHS3 standards is mandatory.

Both parts share identical package geometry, mounting type, and core voltage/current specifications, enabling direct substitution within the defined parameter boundaries.

Frequently Asked Questions (FAQ)

Q: Can the LCDA15.TBT replace the SM8LC15/TR7 in all applications?

A: The LCDA15.TBT is electrically equivalent for voltage and current parameters. However, verify that your application operates within the LCDA15.TBT temperature range of -55°C to 125°C (TJ) and does not require the higher 500W peak pulse power rating of the SM8LC15/TR7. If your circuit operates above 125°C junction temperature or requires 500W dissipation capability, the SM8LC15/TR7 is required.

Q: Are the packages physically identical?

A: Yes. Both the SM8LC15/TR7 and LCDA15.TBT use the 8-SOIC package with 0.154" (3.90mm) width. Pin-to-pin compatibility is maintained, and both are surface-mount devices suitable for identical PCB layouts.

Q: What is the difference in capacitance between these parts?

A: The SM8LC15/TR7 has 25pF capacitance at 1MHz, while the LCDA15.TBT has 5pF at 1MHz. In high-frequency applications where input impedance or signal coupling is sensitive to parasitic capacitance, this difference must be evaluated against circuit requirements.

Q: Does the RoHS compliance difference affect electrical performance?

A: No. RoHS compliance status reflects manufacturing and material composition standards, not electrical performance. The LCDA15.TBT is ROHS3 compliant, while the SM8LC15/TR7 is RoHS non-compliant. Selection depends on regulatory requirements for your end product.

Q: Can I use the LCDA15.TBT in a circuit designed for 150°C operation?

A: No. The LCDA15.TBT maximum junction temperature is 125°C. For applications requiring operation above 125°C, the SM8LC15/TR7 with its 150°C rating must be used.

Q: Are both parts available in Tape & Reel packaging?

A: Yes. Both the SM8LC15/TR7 and LCDA15.TBT are supplied in Tape & Reel (TR) packaging for automated assembly processes.