CTES0312V-G Equivalent & Substitute Parts

Part Overview

The CTES0312V-G is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Comchip Technology, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 12V reverse standoff voltage with a 20V maximum clamping voltage and 17A peak pulse current capability in an SOT-23-3 package. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

CTES0312V-G

Comchip TechnologyIn Stock: 943CTES0312V-G Datasheet

Current PartRFQ

SM12T1G

onsemiIn Stock: 125476SM12T1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CTES0312V-G is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff: 12V nominal
• Voltage - Breakdown (Min): 13.3V minimum
• Package / Case: SOT-23-3 (TO-236-3, SC-59)
• Unidirectional Channels: 2
• Mounting Type: Surface Mount
• Applications: General Purpose

The SM12T1G from onsemi qualifies as a direct substitute based on matching reverse standoff voltage, breakdown voltage, package configuration, channel count, and mounting type. Variations in clamping voltage (20V vs. 19V) and peak pulse current (17A vs. 12A) remain within acceptable tolerance ranges for general-purpose TVS applications while maintaining functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SM12T1G is the qualified substitute for the CTES0312V-G based on the following factors:

• Both components maintain identical reverse standoff voltage (12V) and breakdown voltage (13.3V), ensuring equivalent voltage protection thresholds
• Package compatibility is confirmed: both use SOT-23-3 surface-mount configuration, enabling direct PCB layout substitution
• The SM12T1G carries Active product status with ROHS3 compliance and REACH Unaffected certification, providing long-term supply assurance and regulatory alignment
• Operating temperature range of the SM12T1G (-55 to 150°C) exceeds the original component (-55 to 125°C), offering extended thermal performance
• Peak pulse power rating remains constant at 300W across both components
• The SM12T1G is available in high inventory volume (125,400 pcs), ensuring procurement reliability

Frequently Asked Questions (FAQ)

Q: Can the SM12T1G directly replace the CTES0312V-G without PCB modifications?

A: Yes. Both components use identical SOT-23-3 package geometry and pinout configuration, allowing direct substitution without PCB layout changes.

Q: What is the significance of the 1V difference in clamping voltage (20V vs. 19V)?

A: The clamping voltage difference (20V maximum for CTES0312V-G vs. 19V for SM12T1G) represents the maximum voltage transient suppression point. The 1V variance remains within typical application tolerances for general-purpose TVS protection and does not compromise functional compatibility.

Q: Why does the SM12T1G have lower peak pulse current (12A vs. 17A)?

A: The SM12T1G maintains the same 300W peak pulse power rating despite lower current specification. This reflects different internal design characteristics while preserving overall energy dissipation capability. Application-specific transient profiles should be evaluated to confirm adequacy.

Q: Is the extended operating temperature range of SM12T1G (to 150°C) a concern?

A: No. The extended upper temperature limit of the SM12T1G provides additional thermal margin and does not introduce compatibility issues. This represents an improvement over the original component specification.

Q: Are there compliance or supply chain advantages to using SM12T1G?

A: Yes. The SM12T1G is an Active product with ROHS3 compliance and REACH Unaffected status, ensuring regulatory alignment and long-term availability. The CTES0312V-G is Obsolete, making the SM12T1G the preferred choice for new designs and ongoing production support.