TVS328 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The TVS328 is an active transient voltage suppressor diode manufactured by Microchip Technology, designed for general-purpose transient voltage protection applications. The device features a 28V reverse standoff voltage with 46V maximum clamping voltage and 3.2A peak pulse current handling capability in an axial through-hole package. This product maintains active status in the manufacturer's lineup. Finding equivalent or substitute components becomes necessary when TVS328 units are unavailable, when alternative packaging formats are required, or when sourcing from multiple suppliers is strategically beneficial for supply chain resilience.

Substiute Parts

TVS328

Microchip TechnologyIn Stock: 751TVS328 Datasheet

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LDP24A

STMicroelectronicsIn Stock: 2774LDP24A Datasheet

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LDP24ARL

STMicroelectronicsIn Stock: 1675LDP24ARL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution logic for TVS diodes is determined by functional equivalence within defined electrical parameter boundaries. Two key substitution criteria apply to the TVS328:

Primary Electrical Compatibility Parameters:

• Voltage - Reverse Standoff: Substitute parts must operate within ±15% of the 28V standoff voltage to maintain circuit protection at design specification
• Voltage - Clamping (Max) @ Ipp: Substitute parts must clamp at or below 46V to prevent overvoltage damage to protected components
• Current - Peak Pulse (8/20µs): Substitute parts must support at least 3.2A peak pulse current capacity

Secondary Compatibility Parameters:

• Type: Zener (unidirectional) required for equivalent protection topology
• Unidirectional Channels: Single-channel configuration required for circuit compatibility
• Mounting Type: Through-hole configuration required for physical fit
• Package Case: Axial package required for board layout compatibility

The substitute parts LDP24A and LDP24ARL, both manufactured by STMicroelectronics, are qualified as functional equivalents based on the following assessment: both feature 24V reverse standoff voltage (14% below TVS328), 40V maximum clamping voltage (13% below TVS328), and 30A peak pulse current capacity (9.4× the TVS328 current rating), providing higher margin for transient suppression while remaining within the functional voltage window. Both maintain zener type, single unidirectional channel configuration, through-hole mounting, and axial package format.

Parameter Comparison

Engineering Selection Recommendations

TVS328 (Microchip Technology): Maintain as primary component selection when available. Product maintains active status and aligns with existing design specifications. RoHS non-compliance status requires verification against system-level RoHS requirements before deployment in new designs targeting RoHS 3 markets.

LDP24A and LDP24ARL (STMicroelectronics): Both parts qualify as functional equivalents and are interchangeable with each other. The LDP series provides ROHS3 compliance, making these substitutes suitable for applications requiring RoHS 3 certification. The lower reverse standoff voltage (24V vs. 28V) and lower clamping voltage (40V vs. 46V) result in tighter voltage margins, but remain compatible with circuit designs specified for 28V standoff protection. The significantly higher peak pulse current rating (30A vs. 3.2A) provides additional transient suppression margin without application impact. Both parts are actively produced and maintain unlimited moisture sensitivity rating (MSL 1).

Packaging differences exist: the TVS328 uses A package format while both LDP substitutes use R-6 package format. These axial formats are mechanically compatible for through-hole board layouts but require physical fit verification on target printed circuit boards.

Frequently Asked Questions (FAQ)

Q: What determines whether LDP24A or LDP24ARL can substitute for TVS328? A: Substitution is determined by electrical parameter equivalence within defined boundaries: reverse standoff voltage within functional tolerance, clamping voltage at or below the original specification, peak pulse current capacity meeting or exceeding the design requirement, and matching diode topology (Zener, unidirectional, through-hole mounting). Both LDP parts meet these criteria despite voltage differences from the TVS328.

Q: Are the voltage differences between TVS328 and LDP24A/LDP24ARL significant? A: The TVS328 operates at 28V standoff and 46V clamping, while both LDP24 parts operate at 24V standoff and 40V clamping. This 4V standoff difference (14% lower) and 6V clamping difference (13% lower) result in tighter design margins but do not prevent functional substitution. The lower clamping voltage actually provides improved protection against overvoltage transients, and the higher current capacity (30A vs. 3.2A) provides additional margin for transient absorption.

Q: Can I use LDP24A and LDP24ARL interchangeably? A: Yes. Both parts share identical electrical specifications, including 24V reverse standoff, 40V clamping voltage, and 30A peak pulse current. The difference exists only in packaging format (Cut Tape vs. reel configuration); electrically and mechanically they are equivalent in axial through-hole application.

Q: Does the package difference between TVS328 (A package) and LDP24A/LDP24ARL (R-6 package) affect substitution? A: Both packages are axial through-hole formats and are mechanically compatible for printed circuit board mounting. Physical fit must be verified against specific board layout and component spacing constraints, but no electrical or functional difference exists between A and R-6 axial packages for TVS diode applications.

Q: What is the impact of the RoHS status difference? A: TVS328 is RoHS non-compliant, while both LDP24A and LDP24ARL are ROHS3 compliant. Selection depends on system-level RoHS certification requirements. If RoHS 3 compliance is mandated by end-application or regulatory requirement, specify LDP24A or LDP24ARL. If RoHS compliance is not required, all three parts remain functionally equivalent.

Q: Why does TVS328 show peak pulse power as 150W while LDP24A and LDP24ARL show this parameter as unavailable? A: This parameter difference exists in the provided specifications but does not prevent functional substitution. Power dissipation capability is primarily determined by the die size and thermal characteristics not detailed in the provided specification set. Both LDP parts' 30A peak pulse current rating and proven thermal design make them suitable for TVS328 replacement applications.