SMS24C.TCT Equivalent & Substitute Parts

Part Overview

The SMS24C.TCT is a transient voltage suppressor (TVS) diode manufactured by Semtech Corporation, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 24V reverse standoff voltage with a 44V clamping voltage and 8A peak pulse current capability in an SOT-23-6 package. The part is currently active in production and RoHS compliant, making it suitable for modern electronic designs requiring transient suppression across five unidirectional channels.

Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility is required while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Substiute Parts

SMS24C.TCT

Semtech CorporationIn Stock: 6469SMS24C.TCT Datasheet

Current PartRFQ

PESD24VS5UD,115

NXP USA Inc.In Stock: 35684PESD24VS5UD,115 Datasheet

MFR RecommendedRFQ

SMS24CT1G

onsemiIn Stock: 15364SMS24CT1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMS24C.TCT is determined by the following critical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff: 24V (Max)
• Voltage - Breakdown (Min): 26.7V or equivalent
• Unidirectional Channels: 5 channels
• Mounting Type: Surface Mount
• Package compatibility: SOT-23-6 or functionally equivalent surface-mount packages

Secondary Compatibility Factors:

• Voltage - Clamping (Max) @ Ipp: 44V or lower (lower values provide enhanced protection margin)
• Current - Peak Pulse: 8A or higher (equal or greater current handling)
• Operating Temperature Range: Must encompass or exceed -55°C to 125°C
• RoHS Compliance: Required for modern applications

Two substitute parts meet these criteria with varying performance characteristics and package configurations.

Parameter Comparison

Engineering Selection Recommendations

SMS24CT1G (onsemi) - Primary Substitute

The SMS24CT1G is the preferred substitute for the SMS24C.TCT. Both parts share identical voltage specifications (24V standoff, 26.7V breakdown, 44V clamping) and current ratings (8A peak pulse). The SMS24CT1G maintains the same capacitance profile (60pF @ 1MHz) and offers superior peak pulse power handling (350W versus 300W). Package compatibility is confirmed through both SOT-23-6 and TSOT-23-6 designations. The part is ROHS3 compliant and rated for -40°C to 150°C operation, providing extended high-temperature performance. This substitute is suitable for direct replacement in existing designs without circuit modification.

PESD24VS5UD,115 (NXP) - Secondary Substitute

The PESD24VS5UD,115 maintains voltage compatibility (24V standoff, 25.5V breakdown) and channel count (5 unidirectional channels) but presents reduced current handling capability (4A versus 8A peak pulse) and elevated clamping voltage (52V versus 44V). This part is appropriate only for applications where peak pulse current requirements do not exceed 4A and where the higher clamping voltage does not compromise circuit protection margins. The extended operating temperature range (-65°C to 150°C) and lower capacitance (45pF @ 1MHz) may benefit specific low-frequency or wide-temperature applications. Package configuration differs (SC-74/SOT-457 versus SOT-23-6), requiring PCB layout verification.

Frequently Asked Questions (FAQ)

Q: Can SMS24CT1G replace SMS24C.TCT without circuit modification?

A: Yes. The SMS24CT1G is electrically and mechanically compatible with the SMS24C.TCT. Both parts share identical voltage ratings (24V standoff, 26.7V breakdown, 44V clamping) and current specifications (8A peak pulse). Package designations (SOT-23-6 and TSOT-23-6) are compatible. No circuit redesign is required.

Q: What are the limitations of PESD24VS5UD,115 as a substitute?

A: The PESD24VS5UD,115 has two significant limitations: reduced peak pulse current (4A versus 8A) and elevated clamping voltage (52V versus 44V). Applications requiring 8A transient suppression cannot use this part. The higher clamping voltage may reduce protection effectiveness in circuits sensitive to voltage overshoot. Package configuration (SC-74/SOT-457) differs from the original SOT-23-6, requiring PCB layout verification.

Q: Are all substitute parts RoHS compliant?

A: SMS24CT1G is ROHS3 compliant. PESD24VS5UD,115 compliance status is not specified in available documentation. SMS24C.TCT is RoHS compliant. Verify compliance requirements with your procurement or quality assurance department before selection.

Q: How do operating temperature ranges affect substitution?

A: SMS24C.TCT operates from -55°C to 125°C (junction temperature). SMS24CT1G extends to -40°C to 150°C, providing wider high-temperature capability. PESD24VS5UD,115 operates from -65°C to 150°C (ambient temperature). Select based on your application's thermal environment. Extended ranges do not compromise performance at standard operating conditions.

Q: Can package differences between SOT-23-6 and 6-TSOP affect PCB layout?

A: Yes. While both are six-pin surface-mount packages, physical dimensions and pin spacing may differ. Verify footprint compatibility with your PCB design before committing to PESD24VS5UD,115. SMS24CT1G maintains SOT-23-6 compatibility with the original part.

Q: What is the significance of capacitance differences (60pF versus 45pF)?

A: Capacitance affects high-frequency transient response. The 60pF rating of SMS24C.TCT and SMS24CT1G provides consistent performance in circuits with fast transient events. The 45pF rating of PESD24VS5UD,115 may reduce parasitic coupling in sensitive analog circuits but is not a limiting factor for standard TVS applications.