SMS15CT1 Equivalent & Substitute Parts

Part Overview

The SMS15CT1 is a unidirectional Transient Voltage Suppressor (TVS) diode designed for general-purpose overvoltage protection applications. Manufactured by onsemi in SC-74 surface mount packaging, this component provides 15V reverse standoff voltage with 29V maximum clamping voltage and 12A peak pulse current capability.

The SMS15CT1 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this TVS diode specification.

Substiute Parts

SMS15CT1

onsemiIn Stock: 15171SMS15CT1 Datasheet

Current PartRFQ

SMS15CT1G

onsemiIn Stock: 17275SMS15CT1G Datasheet

DirectRFQ

SMS15C.TCT

Semtech CorporationIn Stock: 17184SMS15C.TCT Datasheet

DirectRFQ

PESD15VS5UD,115

Nexperia USA Inc.In Stock: 4207PESD15VS5UD,115 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMS15CT1 are identified based on electrical parameter compatibility within the following criteria:

Primary Electrical Parameters:

• Voltage - Reverse Standoff (Typ): 15V (Max)
• Voltage - Breakdown (Min): 17V minimum
• Voltage - Clamping (Max) @ Ipp: 29V to 33V range
• Current - Peak Pulse (10/1000µs): 6A to 12A
• Unidirectional Channels: 5

Substitution Categories:

Direct Substitutes (Electrical & Functional Equivalence):

• SMS15CT1G and SMS15C.TCT maintain identical or near-identical electrical specifications with the SMS15CT1, differing primarily in packaging format and product status.

Similar Substitutes (Functional Compatibility with Parameter Variance):

• PESD15VS5UD,115 provides equivalent reverse standoff voltage and breakdown characteristics but operates at higher clamping voltage (33V vs. 29V) and reduced peak pulse current (6A vs. 12A). This part is suitable for applications where lower current handling is acceptable and higher clamping voltage does not compromise circuit design.

Parameter Comparison

Engineering Selection Recommendations

SMS15CT1G (onsemi): This part is the primary direct substitute for the obsolete SMS15CT1. It maintains identical electrical specifications and differs only in packaging format (6-TSOP vs. SC-74) and product status (Active). SMS15CT1G carries ROHS3 compliance, addressing regulatory requirements that the original SMS15CT1 does not meet. This part is recommended for new designs and production transitions.

SMS15C.TCT (Semtech Corporation): This part provides electrical equivalence with minor parameter variance (16.7V breakdown vs. 17V, 300W vs. 350W peak pulse power). It is available in SOT-23-6 packaging and carries RoHS compliance. The reduced operating temperature range (-55°C to 125°C vs. -40°C to 150°C) may limit suitability for high-temperature applications. This part is suitable for applications where package compatibility with SOT-23-6 footprints is required.

PESD15VS5UD,115 (Nexperia USA Inc.): This part maintains the 15V reverse standoff voltage and 17V breakdown voltage but operates at 33V clamping voltage with reduced peak pulse current (6A vs. 12A). It is qualified to AEC-Q100 automotive standards and carries ROHS3 compliance. This part is suitable for applications where lower current transient events are expected and higher clamping voltage is acceptable. The SC-74 package option provides direct footprint compatibility with the original SMS15CT1.

Frequently Asked Questions (FAQ)

Q: Can SMS15CT1G be used as a direct replacement for SMS15CT1?

A: Yes. SMS15CT1G maintains identical electrical specifications (15V reverse standoff, 29V clamping, 12A peak pulse current) and is the active equivalent. The primary difference is packaging format (6-TSOP vs. SC-74). Verify PCB footprint compatibility before substitution.

Q: What is the key difference between SMS15C.TCT and SMS15CT1?

A: SMS15C.TCT is manufactured by Semtech Corporation and provides equivalent electrical performance with minor variance in breakdown voltage (16.7V vs. 17V) and peak pulse power (300W vs. 350W). It is packaged in SOT-23-6 format and carries RoHS compliance. Operating temperature range is reduced to -55°C to 125°C.

Q: When should PESD15VS5UD,115 be selected over SMS15CT1G?

A: PESD15VS5UD,115 is selected when: (1) lower peak pulse current (6A) is sufficient for the application, (2) higher clamping voltage (33V) does not compromise circuit design, (3) automotive qualification (AEC-Q100) is required, or (4) SC-74 package footprint compatibility is necessary. This part is not suitable for applications requiring 12A peak pulse current handling.

Q: Are all substitute parts RoHS compliant?

A: SMS15CT1 is RoHS non-compliant. SMS15CT1G, SMS15C.TCT, and PESD15VS5UD,115 are all RoHS compliant (ROHS3 or RoHS). Verify compliance requirements for your application before selection.

Q: What packaging options are available for substitutes?

A: SMS15CT1G is available in 6-TSOP (SOT-23-6 Thin, TSOT-23-6). SMS15C.TCT is available in SOT-23-6. PESD15VS5UD,115 is available in 6-TSOP with SC-74 and SOT-457 package options. Confirm PCB footprint compatibility with your design before substitution.

Q: Can SMS15C.TCT be used in high-temperature applications?

A: SMS15C.TCT has an operating temperature range of -55°C to 125°C (TJ), which is narrower than SMS15CT1 (-40°C to 150°C). It is not suitable for applications requiring operation above 125°C. SMS15CT1G or PESD15VS5UD,115 are preferred for extended temperature range requirements.