SP03A-3.3BTG Equivalent & Substitute Parts

Part Overview

The SP03A-3.3BTG is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for Ethernet applications requiring rail-to-rail steering protection. This component features a 3.3V reverse standoff voltage with an 18V maximum clamping voltage and 150A peak pulse current capability in an 8-SO surface mount package. The part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and procurement.

Substiute Parts

SP03A-3.3BTG

Littelfuse Inc.In Stock: 1764SP03A-3.3BTG Datasheet

Current PartRFQ

LC03-3.3BTG

LittelfuseIn Stock: 1256LC03-3.3BTG Datasheet

DirectRFQ

LC03-3.3.TBT

Semtech CorporationIn Stock: 20881LC03-3.3.TBT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SP03A-3.3BTG is determined by the following critical parameters:

• Reverse standoff voltage: 3.3V (Max)
• Clamping voltage: 18V maximum
• Peak pulse current: minimum 150A (8/20µs)
• Unidirectional channels: 2
• Package compatibility: 8-SOIC surface mount
• Operating temperature range: -40°C to 125°C minimum
• RoHS3 compliance
• Power line protection capability for Ethernet applications

The identified substitute parts meet these core electrical and mechanical requirements while maintaining functional equivalence for Ethernet transient protection circuits.

Parameter Comparison

Engineering Selection Recommendations

LC03-3.3BTG is the primary substitute for the obsolete SP03A-3.3BTG. Both components are manufactured by Littelfuse, share identical reverse standoff voltage and peak pulse current specifications, and maintain the same 8-SOIC package footprint. The LC03-3.3BTG is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. The clamping voltage differential of 1V (17V versus 18V) remains within acceptable transient suppression parameters for Ethernet protection circuits.

LC03-3.3.TBT, manufactured by Semtech Corporation, provides an alternative substitute with matching clamping voltage (18V) and package compatibility. This part operates across an extended temperature range (-55°C to 125°C) and maintains ROHS3 compliance. The peak pulse current specification of 100A is lower than the original 150A rating, resulting in reduced peak pulse power (1.8kW versus 3.3kW). Selection of this substitute requires confirmation that circuit transient energy levels do not exceed the reduced power dissipation capability.

Both substitute parts maintain active production status, ensuring long-term availability and supply chain continuity compared to the obsolete original component.

Frequently Asked Questions (FAQ)

Q: Can LC03-3.3BTG be used as a direct replacement for SP03A-3.3BTG?

A: Yes. Both components share the same reverse standoff voltage (3.3V), peak pulse current (150A), package configuration (8-SOIC), and operating temperature range (-40°C to 125°C). The 1V difference in clamping voltage (17V versus 18V) is within acceptable tolerance for Ethernet transient protection applications. LC03-3.3BTG is manufactured by the same supplier and maintains active production status.

Q: What is the key difference between LC03-3.3BTG and LC03-3.3.TBT?

A: The primary difference is peak pulse current capability. LC03-3.3BTG handles 150A (matching the original SP03A-3.3BTG), while LC03-3.3.TBT is rated for 100A. This results in peak pulse power ratings of 3300W and 1800W respectively. Both maintain 18V clamping voltage and 8-SOIC package compatibility. LC03-3.3.TBT offers extended temperature range (-55°C to 125°C) and is manufactured by Semtech Corporation.

Q: Are package dimensions identical across all three parts?

A: Yes. SP03A-3.3BTG, LC03-3.3BTG, and LC03-3.3.TBT all use the 8-SOIC package with 0.154" (3.90mm) width specification. PCB footprints and mounting procedures are identical.

Q: Does the capacitance difference between parts affect circuit performance?

A: Capacitance values at 1MHz are 16pF for SP03A-3.3BTG and LC03-3.3.TBT, and 9pF for LC03-3.3BTG. The lower capacitance of LC03-3.3BTG may provide improved high-frequency performance in signal integrity-sensitive applications. Circuit simulation or testing is necessary to determine if this parameter affects specific application requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. SP03A-3.3BTG, LC03-3.3BTG, and LC03-3.3.TBT are all ROHS3 compliant with moisture sensitivity level 1 (unlimited). All parts meet current environmental and regulatory requirements.

Q: Which substitute should be selected for new designs?

A: LC03-3.3BTG is the recommended primary choice for new designs, offering identical electrical performance to the original part with active production status from Littelfuse. LC03-3.3.TBT serves as a secondary option when extended temperature range (-55°C to 125°C) is required, provided circuit transient energy levels remain within the 1.8kW power dissipation limit.