SM8LC12/TR7 Equivalent & Substitute Parts

Part Overview

The SM8LC12/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 12V reverse standoff voltage and provides 24V clamping at peak pulse current, with a peak pulse rating of 5A (8/20µs). 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 critical parameters including voltage ratings, current handling, package type, and operating temperature range. Identification of alternatives ensures design flexibility, supply chain continuity, and component availability across manufacturing cycles.

Substiute Parts

SM8LC12/TR7

Microchip TechnologyIn Stock: 702SM8LC12/TR7 Datasheet

Current PartRFQ

LCDA12.TBT

Semtech CorporationIn Stock: 2115LCDA12.TBT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SM8LC12/TR7 are qualified based on strict equivalence across the following critical parameters:

Voltage Specifications: Reverse standoff voltage of 12V, minimum breakdown voltage of 13.3V, and maximum clamping voltage of 24V at peak pulse current must be maintained.

Current Rating: Peak pulse current of 5A at 8/20µs pulse duration is the baseline requirement.

Package Compatibility: All substitutes must use the 8-SOIC (0.154", 3.90mm Width) surface-mount package to ensure PCB layout and assembly compatibility.

Bidirectional Configuration: The 2-channel bidirectional topology must be preserved.

Device Type: Zener-type TVS diode classification applies to all qualified substitutes.

The LCDA12.TBT from Semtech Corporation meets these core electrical and mechanical requirements and is therefore classified as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (SM8LC12/TR7): The Microchip SM8LC12/TR7 is the specified component with Active product status. This part provides the full operating temperature range of -55°C to 150°C and peak pulse power rating of 500W. Selection is appropriate for applications requiring maximum thermal performance and power dissipation capacity within the specified voltage and current envelope.

Substitute Selection (LCDA12.TBT): The Semtech LCDA12.TBT is a qualified substitute that maintains all critical voltage, current, and package specifications. This part achieves ROHS3 compliance, whereas the primary part is RoHS non-compliant. The operating temperature range is reduced to -55°C to 125°C, and peak pulse power is rated at 300W. The substitute is suitable for applications where the reduced upper temperature limit and power rating do not constrain system performance, and where RoHS3 compliance is required.

Both parts carry Active product status and are available in current inventory. Selection between primary and substitute should be based on compliance requirements, thermal environment constraints, and supply chain considerations.

Frequently Asked Questions (FAQ)

Q: Can the LCDA12.TBT be used as a direct replacement for the SM8LC12/TR7 in all applications?

A: The LCDA12.TBT maintains electrical equivalence for voltage and current specifications. However, the reduced operating temperature range (125°C maximum junction temperature versus 150°C) and lower peak pulse power rating (300W versus 500W) must be evaluated against application requirements. If the circuit operates within -55°C to 125°C and does not require sustained power dissipation exceeding 300W, the substitute is compatible.

Q: What is the significance of the packaging difference between Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel®?

A: Tape & Reel and Cut Tape are supply formats that do not affect component electrical or mechanical performance. Both formats use the same 8-SOIC package. The choice between formats depends on manufacturing volume and assembly equipment compatibility. The Digi-Reel® format is a proprietary packaging option that maintains the same component specifications.

Q: Are there differences in capacitance between the two parts?

A: Yes. The SM8LC12/TR7 has 25pF capacitance at 1MHz, while the LCDA12.TBT has 5pF at 1MHz. This difference may affect high-frequency circuit behavior. Applications sensitive to input capacitance should evaluate this parameter against circuit requirements.

Q: What is the impact of RoHS compliance status on part selection?

A: The SM8LC12/TR7 is RoHS non-compliant, while the LCDA12.TBT is ROHS3 compliant. RoHS compliance is a regulatory requirement in certain markets and for specific customer applications. If RoHS3 compliance is mandated, the LCDA12.TBT must be selected. If no compliance requirement exists, either part is acceptable from a regulatory standpoint.

Q: Do both parts have the same moisture sensitivity level?

A: Yes. Both the SM8LC12/TR7 and LCDA12.TBT carry Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life and no special moisture control requirements during storage or handling.

Q: What is the basis for determining substitution compatibility?

A: Substitution compatibility is determined by equivalence across voltage ratings (reverse standoff, breakdown, and clamping), peak pulse current, bidirectional channel configuration, package type, and mounting method. Secondary parameters such as power rating, capacitance, and temperature range are evaluated to identify constraints that may affect specific applications.