SM8LC12/TR13 Equivalent & Substitute Parts

Part Overview

The SM8LC12/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 12V reverse standoff voltage and provides 24V clamping at peak pulse current, making it suitable for protecting sensitive electronic circuits from transient voltage events. The device is currently in active production status. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when specific packaging, compliance, or performance characteristics are required for system integration.

Substiute Parts

SM8LC12/TR13

Microchip TechnologyIn Stock: 1161SM8LC12/TR13 Datasheet

Current PartRFQ

LCDA12.TBT

Semtech CorporationIn Stock: 2115LCDA12.TBT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SM8LC12/TR13 is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff: 12V (matching specification)
• Voltage - Breakdown (Min): 13.3V (matching specification)
• Voltage - Clamping (Max) @ Ipp: 24V (matching specification)
• Current - Peak Pulse (8/20µs): 5A (matching specification)
• Bidirectional Channels: 2 (matching specification)
• Type: Zener (matching specification)

Mechanical Equivalence Criteria:

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

The substitute part LCDA12.TBT meets all electrical and mechanical equivalence criteria and is therefore a direct functional substitute for the SM8LC12/TR13 in applications requiring identical voltage protection characteristics and package compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (SM8LC12/TR13): The SM8LC12/TR13 is the specified component for applications requiring the full operating temperature range of -55°C to 150°C and peak pulse power dissipation of 500W. This part is suitable for high-reliability applications where maximum thermal performance and extended temperature operation are design requirements. The part is currently in active production with 1138 units in stock.

Substitute Selection (LCDA12.TBT): The LCDA12.TBT is a direct electrical and mechanical equivalent for applications where the operating temperature range of -55°C to 125°C is acceptable and peak pulse power dissipation of 300W is sufficient. This substitute offers ROHS3 compliance, which may be required for certain regulatory or customer specifications. The part is currently in active production with 2044 units in stock. The LCDA12.TBT is available in Cut Tape and Digi-Reel® packaging formats, providing alternative sourcing and supply chain flexibility compared to the Tape & Reel format of the primary part.

Selection between these parts should be based on specific application requirements regarding operating temperature limits, power dissipation needs, and regulatory compliance mandates.

Frequently Asked Questions (FAQ)

Q: Can the LCDA12.TBT replace the SM8LC12/TR13 in all applications?

A: The LCDA12.TBT is electrically and mechanically equivalent for voltage protection characteristics (12V standoff, 24V clamping, 5A peak pulse current). However, applications operating above 125°C junction temperature or requiring 500W peak pulse power dissipation must use the SM8LC12/TR13. Verify your application's maximum operating temperature and power dissipation requirements before substitution.

Q: What are the key differences between these two parts?

A: The primary differences are: (1) Operating temperature range—SM8LC12/TR13 extends to 150°C while LCDA12.TBT is limited to 125°C; (2) Peak pulse power rating—SM8LC12/TR13 is rated at 500W while LCDA12.TBT is rated at 300W; (3) Capacitance—SM8LC12/TR13 has 25pF while LCDA12.TBT has 5pF at 1MHz; (4) RoHS compliance—LCDA12.TBT is ROHS3 compliant while SM8LC12/TR13 is non-compliant; (5) Packaging format—SM8LC12/TR13 is supplied in Tape & Reel while LCDA12.TBT is available in Cut Tape and Digi-Reel® formats.

Q: Are the package dimensions identical?

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

Q: Does the lower capacitance of the LCDA12.TBT affect circuit performance?

A: The LCDA12.TBT has 5pF capacitance compared to 25pF for the SM8LC12/TR13 at 1MHz. This difference may affect high-frequency circuit behavior. Applications sensitive to input capacitance or operating at frequencies where capacitive loading is critical should retain the SM8LC12/TR13 or conduct circuit analysis to confirm LCDA12.TBT compatibility.

Q: Which part should I select for new designs?

A: For new designs, select based on application requirements: use SM8LC12/TR13 if operating temperatures exceed 125°C or peak pulse power exceeds 300W; use LCDA12.TBT if ROHS3 compliance is required and operating conditions fall within -55°C to 125°C and 300W maximum power dissipation. Both parts are in active production and suitable for long-term supply chain planning.

Q: Are there any differences in electrical performance between these parts?

A: Both parts meet identical voltage specifications (12V standoff, 13.3V breakdown minimum, 24V clamping maximum) and current ratings (5A peak pulse at 8/20µs). The electrical performance for transient voltage suppression is equivalent. Differences in power rating and capacitance are the only performance distinctions.