SM8LC24/TR13 Equivalent & Substitute Parts

Part Overview

The SM8LC24/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 24V reverse standoff voltage and provides 55V 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 address inventory availability, compliance requirements, or specific application constraints while maintaining electrical and mechanical compatibility.

Substiute Parts

SM8LC24/TR13

Microchip TechnologyIn Stock: 804SM8LC24/TR13 Datasheet

Current PartRFQ

LCDA24.TBT

Semtech CorporationIn Stock: 3957LCDA24.TBT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SM8LC24/TR13 with the LCDA24.TBT is determined by strict equivalence of the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff: 24V (both parts)
• Voltage - Breakdown (Min): 26.7V (both parts)
• Voltage - Clamping (Max) @ Ipp: 55V (both parts)
• Current - Peak Pulse (8/20µs): 5A (both parts)
• Bidirectional Channels: 2 (both parts)
• Type: Zener TVS Diode (both parts)

Mechanical Equivalence Criteria:

• Package / Case: 8-SOIC (0.154", 3.90mm Width) (both parts)
• Mounting Type: Surface Mount (both parts)
• Supplier Device Package: 8-SO (both parts)
• Moisture Sensitivity Level: 1 (Unlimited) (both parts)

Both parts are classified as Transient Voltage Suppressors for general-purpose applications and share identical pinout and footprint compatibility.

Parameter Comparison

Engineering Selection Recommendations

SM8LC24/TR13 (Microchip Technology): Select this part when the application requires the higher peak pulse power rating of 500W and extended operating temperature range to 150°C. This part is suitable for designs where maximum thermal headroom and power dissipation capacity are critical. Note that this part carries RoHS non-compliant status.

LCDA24.TBT (Semtech Corporation): Select this part when RoHS3 compliance is a mandatory requirement for the end application or supply chain. The LCDA24.TBT maintains all critical electrical parameters (voltage standoff, breakdown, clamping, and peak pulse current) while offering lower capacitance (5pF versus 25pF), which may be advantageous in high-frequency signal integrity applications. The operating temperature range extends to 125°C, which is sufficient for most industrial and commercial applications. This part is currently in active production with higher inventory availability (3888 pcs versus 768 pcs).

Both parts are electrically and mechanically interchangeable for the core TVS protection function in 24V systems with 5A peak pulse current requirements.

Frequently Asked Questions (FAQ)

Q: Are SM8LC24/TR13 and LCDA24.TBT pin-for-pin compatible?

A: Yes. Both parts use the 8-SOIC (0.154", 3.90mm Width) package with identical pinout and footprint. They are direct mechanical and electrical substitutes for PCB assembly without layout modifications.

Q: What is the difference in peak pulse power rating between these parts?

A: The SM8LC24/TR13 is rated for 500W peak pulse power, while the LCDA24.TBT is rated for 300W. Both parts handle the same 5A peak pulse current at 55V clamping voltage. The power rating difference reflects different thermal design margins. Select based on your circuit's transient energy dissipation requirements.

Q: Does the capacitance difference affect circuit performance?

A: The SM8LC24/TR13 has 25pF capacitance at 1MHz, while the LCDA24.TBT has 5pF. In high-frequency applications or sensitive signal paths, the lower capacitance of the LCDA24.TBT may reduce signal loading and distortion. In DC or low-frequency protection circuits, this difference is negligible.

Q: Which part should I use for new designs?

A: For new designs requiring regulatory compliance, the LCDA24.TBT (ROHS3 Compliant) is the preferred choice. For existing designs or applications where RoHS compliance is not required, either part is acceptable based on thermal and power requirements.

Q: What is the operating temperature difference?

A: The SM8LC24/TR13 operates from -55°C to 150°C, while the LCDA24.TBT operates from -55°C to 125°C. The Microchip part provides 25°C additional high-temperature margin. Select the SM8LC24/TR13 for applications requiring operation above 125°C.

Q: Are both parts currently available?

A: Yes. The SM8LC24/TR13 has 768 pcs in stock, and the LCDA24.TBT has 3888 pcs in stock. The Semtech part offers significantly higher inventory availability.

Q: Can I use these parts interchangeably in existing assemblies?

A: Yes, provided your application does not have specific constraints on peak pulse power rating, operating temperature range, or RoHS compliance status. Verify that your circuit's transient energy profile does not exceed the lower 300W power rating of the LCDA24.TBT if substituting from the Microchip part.