SM8LC15/TR13 Equivalent & Substitute Parts

Part Overview

The SM8LC15/TR13 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 available in 8-SOIC packaging suitable for automated assembly processes.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the critical parameters that define TVS diode functionality: reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current, and package form factor.

Substiute Parts

SM8LC15/TR13

Microchip TechnologyIn Stock: 999SM8LC15/TR13 Datasheet

Current PartRFQ

LCDA15.TBT

Semtech CorporationIn Stock: 1898LCDA15.TBT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SM8LC15/TR13 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Voltage - Reverse Standoff: 15V (matching or maximum rating)
• Voltage - Breakdown (Min): 16.7V
• Voltage - Clamping (Max) @ Ipp: 30V
• Current - Peak Pulse (10/1000µs): 5A (8/20µs)
• Bidirectional Channels: 2

Mechanical Equivalence Requirements:

• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Supplier Device Package: 8-SO

Functional Equivalence Requirements:

• Type: Zener
• Applications: General Purpose
• Product Status: Active

The LCDA15.TBT from Semtech Corporation meets all electrical and mechanical equivalence criteria and maintains Active product status, qualifying it as a direct substitute for the SM8LC15/TR13.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: LCDA15.TBT (Semtech Corporation)

The LCDA15.TBT qualifies as a direct electrical and mechanical substitute for the SM8LC15/TR13. Both devices share identical reverse standoff voltage (15V), breakdown voltage (16.7V minimum), clamping voltage (30V), peak pulse current (5A at 8/20µs), bidirectional channel configuration (2), and 8-SOIC package form factor.

Compliance Considerations:

The LCDA15.TBT carries ROHS3 compliance certification, whereas the SM8LC15/TR13 is RoHS non-compliant. Applications requiring RoHS compliance should prioritize the LCDA15.TBT. Both devices maintain REACH Unaffected status and EAR99 export classification.

Operating Temperature Differential:

The SM8LC15/TR13 supports an operating temperature range of -55°C to 150°C (TJ), while the LCDA15.TBT operates from -55°C to 125°C (TJ). Applications requiring operation above 125°C must retain the SM8LC15/TR13.

Power Dissipation Differential:

The SM8LC15/TR13 specifies 500W peak pulse power, compared to 300W for the LCDA15.TBT. Applications with peak pulse power requirements exceeding 300W should retain the SM8LC15/TR13.

Capacitance Differential:

The SM8LC15/TR13 exhibits 25pF capacitance at 1MHz, while the LCDA15.TBT exhibits 5pF. High-frequency signal integrity applications sensitive to parasitic capacitance should evaluate this parameter against circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can the LCDA15.TBT replace the SM8LC15/TR13 in all applications?

A: The LCDA15.TBT provides electrical and mechanical equivalence for the core TVS diode function. However, three application-specific factors require evaluation: (1) operating temperature requirements above 125°C necessitate the SM8LC15/TR13; (2) peak pulse power requirements exceeding 300W necessitate the SM8LC15/TR13; (3) RoHS compliance requirements favor the LCDA15.TBT.

Q: Are the packages physically identical?

A: Both devices use 8-SOIC packaging with 0.154" (3.90mm) width. Pin-to-pin compatibility is maintained, and both are surface-mount components suitable for identical PCB footprints.

Q: What is the significance of the capacitance difference?

A: The SM8LC15/TR13 exhibits 25pF capacitance at 1MHz, while the LCDA15.TBT exhibits 5pF. In high-frequency signal paths or sensitive analog circuits, lower capacitance reduces signal distortion and improves bandwidth performance. Applications operating at DC or low frequencies are unaffected by this difference.

Q: Does the power dissipation difference affect general-purpose protection applications?

A: The 500W (SM8LC15/TR13) versus 300W (LCDA15.TBT) specification reflects peak pulse power handling under 8/20µs transient conditions. General-purpose overvoltage protection applications typically operate within the 300W envelope. Applications with sustained or repeated high-energy transients should retain the SM8LC15/TR13.

Q: What is the inventory status for each part?

A: The SM8LC15/TR13 has 964 pieces in stock. The LCDA15.TBT has 1812 pieces in stock. Both are available as new original components in Tape & Reel packaging.

Q: Are there any regulatory or compliance differences?

A: The LCDA15.TBT is ROHS3 compliant, while the SM8LC15/TR13 is RoHS non-compliant. Both maintain REACH Unaffected status and EAR99 export classification. Applications subject to RoHS regulations should specify the LCDA15.TBT.