SMS12CT1 Equivalent & Substitute Parts Reference

Part Overview

The SMS12CT1 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection applications. This component features a 12V reverse standoff voltage with a 23V maximum clamping voltage and 15A peak pulse current capability in an SC-74 surface mount package.

The SMS12CT1 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

SMS12CT1

onsemiIn Stock: 1007SMS12CT1 Datasheet

Current PartRFQ

SMS12CT1G

onsemiIn Stock: 10389SMS12CT1G Datasheet

DirectRFQ

SMS12C.TCT

SemtechIn Stock: 16068SMS12C.TCT Datasheet

DirectRFQ

PESD12VS5UD,115

Nexperia USA Inc.In Stock: 16931PESD12VS5UD,115 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMS12CT1 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 12V (Max)
• Voltage - Breakdown (Min): 13.3V minimum
• Voltage - Clamping (Max) @ Ipp: 23V maximum
• Current - Peak Pulse (10/1000µs): 15A (8/20µs)
• Unidirectional Channels: 5
• Mounting Type: Surface Mount
• Package compatibility: SC-74/SOT-457 or equivalent surface mount footprints

Direct Substitutes maintain all critical electrical parameters within specified tolerances and are pin-compatible or functionally equivalent in the same package family.

Similar Substitutes meet the core voltage and current protection requirements but may exhibit variations in secondary parameters such as clamping voltage tolerance, peak pulse power rating, or capacitance characteristics. These parts are suitable for applications where the primary protection function is the determining factor.

Parameter Comparison

Engineering Selection Recommendations

SMS12CT1G (onsemi): This part is a direct functional equivalent with identical electrical specifications and maintains the same base product number (SMS12). The primary distinction is packaging format (6-TSOP versus SC-74) and product status (Obsolete). SMS12CT1G achieves ROHS3 compliance, addressing regulatory requirements that the original SMS12CT1 does not meet. Inventory availability is significantly higher (10,300 pcs), supporting production continuity.

SMS12C.TCT (Semtech): This substitute maintains all critical electrical parameters and is classified as Active product status, ensuring long-term supply chain viability. It achieves ROHS3 compliance and operates across an extended temperature range (-55°C to 125°C). The package format is SOT-23-6, which differs from the original SC-74. Inventory availability is substantial (16,008 pcs). Secondary parameter variations include slightly elevated capacitance (135pF versus 120pF) and reduced peak pulse power (300W versus 350W).

PESD12VS5UD,115 (Nexperia USA Inc.): This part meets the core voltage and current protection requirements with Active product status and ROHS3 compliance. It qualifies to AEC-Q100 automotive standards and operates across the widest temperature range (-65°C to 150°C). The package format is 6-TSOP, compatible with the SC-74 footprint family. Notable parameter variations include lower peak pulse current (10A versus 15A) and reduced peak pulse power (200W versus 350W), making this suitable for applications with lower transient energy requirements.

Frequently Asked Questions (FAQ)

Q: Can SMS12CT1G be used as a direct replacement for SMS12CT1?

A: Yes. SMS12CT1G maintains identical electrical specifications including 12V reverse standoff voltage, 13.3V minimum breakdown voltage, 23V maximum clamping voltage, and 15A peak pulse current. Both parts share the same base product number (SMS12) and unidirectional channel configuration. The primary difference is packaging format (6-TSOP versus SC-74) and regulatory compliance status (ROHS3 versus non-compliant).

Q: What are the key differences between SMS12C.TCT and the original SMS12CT1?

A: SMS12C.TCT matches all critical electrical parameters but differs in three areas: (1) manufacturer (Semtech versus onsemi), (2) product status (Active versus Obsolete), and (3) package format (SOT-23-6 versus SC-74). Secondary variations include capacitance (135pF versus 120pF @ 1MHz) and peak pulse power (300W versus 350W). The operating temperature range is narrower (-55°C to 125°C versus -40°C to 150°C).

Q: Is PESD12VS5UD,115 suitable for all applications using SMS12CT1?

A: PESD12VS5UD,115 is suitable for applications where peak pulse current does not exceed 10A and peak pulse power does not exceed 200W. While it maintains the 12V reverse standoff and 23V clamping voltage specifications, the reduced current and power ratings represent a functional limitation. This part is appropriate for lower-energy transient protection scenarios. Verify application requirements before selection.

Q: What is the impact of package format differences on PCB design?

A: SMS12CT1 uses SC-74 (SOT-457) package. SMS12CT1G uses 6-TSOP (SOT-23-6 Thin). SMS12C.TCT uses SOT-23-6. PESD12VS5UD,115 uses 6-TSOP. Package format changes require PCB footprint modification and re-layout validation. Consult manufacturer datasheets for precise pin assignments and land pattern specifications before implementing design changes.

Q: Why is RoHS compliance status important for this substitution?

A: SMS12CT1 is RoHS non-compliant, while SMS12CT1G, SMS12C.TCT, and PESD12VS5UD,115 are ROHS3 compliant. Regulatory requirements in many markets mandate RoHS compliance for new component selections. If the original design does not require RoHS compliance, this is not a limiting factor. If regulatory compliance is required, select from the compliant alternatives.

Q: Which substitute offers the best long-term supply chain availability?

A: SMS12C.TCT (Semtech) offers the highest inventory level (16,008 pcs) and Active product status, indicating ongoing manufacturing and distribution support. PESD12VS5UD,115 (Nexperia) also maintains Active status with substantial inventory (16,850 pcs). Both parts provide superior supply chain continuity compared to the Obsolete SMS12CT1 and SMS12CT1G.