SMS24CT1 Equivalent & Substitute Parts Reference

Part Overview

The SMS24CT1 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection applications. It features a 24V reverse standoff voltage with a 44V maximum clamping voltage and 8A peak pulse current capability in an SC-74 surface mount package. The SMS24CT1 is currently classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and component procurement.

Substiute Parts

SMS24CT1

onsemiIn Stock: 972SMS24CT1 Datasheet

Current PartRFQ

SMS24CT1G

onsemiIn Stock: 15364SMS24CT1G Datasheet

DirectRFQ

SMS24C.TCT

Semtech CorporationIn Stock: 6469SMS24C.TCT Datasheet

DirectRFQ

PESD24VS5UD,115

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMS24CT1 are identified based on matching the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff: 24V (Max)
• Voltage - Breakdown (Min): 26.7V or equivalent
• Voltage - Clamping (Max) @ Ipp: 44V or lower
• Current - Peak Pulse (10/1000µs): 8A or higher
• Unidirectional Channels: 5
• Type: Zener
• Mounting Type: Surface Mount
• Operating Temperature Range: Compatible with -40°C ~ 150°C

Direct Substitutes (SMS24CT1G, SMS24C.TCT) maintain identical electrical specifications and differ only in packaging format and product status. Both are active products with improved compliance certifications.

Similar Substitute (PESD24VS5UD,115) shares the same reverse standoff voltage and general application category but exhibits different clamping voltage (52V), reduced peak pulse current (4A), and lower power dissipation (200W). This part is suitable only when lower current handling and higher clamping voltage are acceptable within the circuit design.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred):

SMS24CT1G and SMS24C.TCT are the primary substitutes for the obsolete SMS24CT1. Both maintain identical electrical performance specifications. SMS24CT1G, manufactured by onsemi, preserves the original manufacturer lineage and carries ROHS3 compliance certification. SMS24C.TCT, supplied by Semtech Corporation, offers RoHS compliance and extended lower operating temperature range (-55°C minimum versus -40°C). Selection between these two depends on supply chain availability and compliance requirements specific to the application.

For Alternative Selection:

PESD24VS5UD,115 from NXP USA Inc. (Nexperia) is classified as a similar substitute due to electrical parameter deviations. The 52V clamping voltage exceeds the SMS24CT1 specification by 8V, and peak pulse current is reduced to 4A (50% of the original 8A rating). This part is suitable only when circuit design tolerates higher clamping voltage and lower current handling capacity. The reduced power dissipation (200W versus 350W) may also impact thermal management considerations.

All substitute options maintain the same 24V reverse standoff voltage, 5-channel unidirectional configuration, and general-purpose TVS diode classification required for functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can SMS24CT1G be used as a direct replacement for SMS24CT1?

A: Yes. SMS24CT1G maintains identical electrical specifications including 24V reverse standoff voltage, 26.7V breakdown voltage, 44V clamping voltage, and 8A peak pulse current. The primary difference is packaging format (6-TSOP versus SC-74) and active product status. PCB layout modifications may be required to accommodate the different package footprint.

Q: What is the key difference between SMS24C.TCT and SMS24CT1G?

A: Both parts share identical electrical performance. SMS24C.TCT is manufactured by Semtech Corporation and offers RoHS compliance with an extended lower operating temperature range (-55°C to 125°C versus -40°C to 150°C). SMS24CT1G is manufactured by onsemi with ROHS3 compliance. Selection depends on supply availability and specific temperature operating requirements.

Q: Is PESD24VS5UD,115 a suitable replacement for SMS24CT1?

A: PESD24VS5UD,115 is a similar substitute with important electrical differences. The clamping voltage is 52V (8V higher than SMS24CT1), and peak pulse current is 4A (50% lower). This part is suitable only when the circuit design accommodates higher clamping voltage and reduced current handling. Direct pin-for-pin replacement is not recommended without circuit analysis.

Q: What package considerations apply when substituting SMS24CT1?

A: SMS24CT1 uses SC-74 (SOT-457) package. SMS24CT1G and SMS24C.TCT use SOT-23-6 package, requiring PCB footprint redesign. PESD24VS5UD,115 uses SC-74 package, maintaining footprint compatibility with the original SMS24CT1. Verify PCB layout and thermal management compatibility before implementation.

Q: Are all substitute parts RoHS compliant?

A: SMS24CT1G carries ROHS3 compliance. SMS24C.TCT carries RoHS compliance. PESD24VS5UD,115 compliance status is not specified in available documentation. Verify compliance requirements for your specific application and regulatory jurisdiction.

Q: What is the inventory status of substitute parts?

A: SMS24CT1G has 15,323 units in stock. SMS24C.TCT has 6,400 units in stock. PESD24VS5UD,115 has 35,658 units in stock. Availability may vary by supplier and region.