T3V3LCS3-7 Equivalent & Substitute Parts

Part Overview

The T3V3LCS3-7 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 3.3V reverse standoff voltage with a 19V clamping voltage at peak pulse current, housed in an SOD-323 package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and component procurement.

Substiute Parts

T3V3LCS3-7

Diodes IncorporatedIn Stock: 1129T3V3LCS3-7 Datasheet

Current PartRFQ

PESD3V3U1UA,115

Nexperia USA Inc.In Stock: 147808PESD3V3U1UA,115 Datasheet

MFR RecommendedRFQ

UCLAMP3301D.TCT

Semtech CorporationIn Stock: 59296UCLAMP3301D.TCT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the T3V3LCS3-7 is determined by the following critical parameters:

• Voltage Class: Reverse standoff voltage of 3.3V and breakdown voltage minimum of 4V define the protection threshold
• Package Compatibility: SOD-323 surface-mount package ensures mechanical and thermal compatibility
• Unidirectional Configuration: Single-channel Zener diode topology for general-purpose transient suppression
• Operating Temperature Range: -55°C to 150°C (or higher) maintains thermal performance across industrial applications
• Compliance Standards: ROHS3 compliance and EAR99 classification ensure regulatory alignment

Two substitute parts meet these core substitution criteria: PESD3V3U1UA,115 (Nexperia USA Inc.) and UCLAMP3301D.TCT (Semtech Corporation). Both maintain the 3.3V voltage class, SOD-323 package, and unidirectional Zener topology. However, they differ in clamping voltage performance and peak pulse current ratings, which affects their suitability for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

PESD3V3U1UA,115 is the manufacturer-recommended substitute. This part maintains active product status with AEC-Q101 automotive qualification, ensuring long-term availability and supply chain stability. The 3.3V reverse standoff voltage and SOD-323 package provide direct functional compatibility. The slightly higher breakdown voltage minimum (4.5V vs. 4V) and lower capacitance (2.6pF vs. 3pF) represent minor parameter variations within acceptable engineering tolerances for general-purpose transient suppression. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) align with the original part specifications.

UCLAMP3301D.TCT offers an alternative from Semtech Corporation's uClamp® series. This part is active and ROHS3 compliant but features reduced peak pulse current (10A vs. 20A) and lower peak pulse power (100W vs. 350W). The clamping voltage is significantly lower at 9.5V compared to the original 19V specification. This substitute is suitable only for applications with lower transient energy requirements. The operating temperature range is limited to -55°C to 125°C, which may restrict use in high-temperature environments. The higher capacitance (50pF vs. 3pF) may introduce additional loading in sensitive signal circuits.

Selection between these substitutes depends on application-specific transient energy levels and thermal operating conditions. For applications requiring the full 20A peak pulse current and 350W power dissipation capability, PESD3V3U1UA,115 is the appropriate choice. For lower-energy transient suppression scenarios, UCLAMP3301D.TCT provides a cost-effective alternative.

Frequently Asked Questions (FAQ)

Q: Can PESD3V3U1UA,115 directly replace T3V3LCS3-7 without circuit modifications?

A: Yes. Both parts share identical reverse standoff voltage (3.3V), unidirectional Zener topology, and SOD-323 package. The minor parameter differences (breakdown voltage 4.5V vs. 4V, capacitance 2.6pF vs. 3pF) fall within acceptable substitution tolerances for general-purpose TVS applications. No circuit modifications are required.

Q: What is the key difference between PESD3V3U1UA,115 and UCLAMP3301D.TCT?

A: The primary differences are peak pulse current rating (not specified vs. 10A), clamping voltage (not specified vs. 9.5V), and power dissipation (not specified vs. 100W). PESD3V3U1UA,115 is recommended for applications matching the original 20A/350W specifications. UCLAMP3301D.TCT is suitable only for lower-energy transient events.

Q: Are both substitutes available in the same packaging format?

A: Yes. Both PESD3V3U1UA,115 and UCLAMP3301D.TCT are supplied in SOD-323 surface-mount packages, matching the original T3V3LCS3-7 package specification. PESD3V3U1UA,115 is available in Tape & Reel (TR) packaging, while UCLAMP3301D.TCT is supplied in Cut Tape (CT) & Digi-Reel® format.

Q: Does the AEC-Q101 qualification on PESD3V3U1UA,115 provide additional assurance?

A: AEC-Q101 qualification indicates automotive-grade reliability testing and quality standards. This certification provides additional assurance for applications requiring automotive-level component reliability, though it does not restrict use in non-automotive applications.

Q: What is the impact of the capacitance difference between these parts?

A: PESD3V3U1UA,115 has 2.6pF capacitance, while UCLAMP3301D.TCT has 50pF. In high-frequency signal circuits, the lower capacitance of PESD3V3U1UA,115 minimizes signal loading and distortion. UCLAMP3301D.TCT's higher capacitance may introduce additional parasitic loading in sensitive analog or RF applications.

Q: Can UCLAMP3301D.TCT be used in applications originally designed for T3V3LCS3-7?

A: UCLAMP3301D.TCT is suitable only for applications where transient energy levels do not exceed its 100W peak pulse power and 10A peak pulse current ratings. Applications requiring the full 20A/350W capability of the original part must use PESD3V3U1UA,115.