TPSMP33-E3/84A Equivalent & Substitute Parts

Part Overview

The TPSMP33-E3/84A is a unidirectional Zener-type transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. Designed for general-purpose overvoltage protection applications, this component features a 26.8V reverse standoff voltage and 47.7V maximum clamping voltage with 8.4A peak pulse current capability in a DO-220AA surface mount package. The product is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements.

Substiute Parts

TPSMP33-E3/84A

Vishay General Semiconductor - Diodes DivisionIn Stock: 891TPSMP33-E3/84A Datasheet

Current PartRFQ

PTVS28VS1UR,115

Nexperia USA Inc.In Stock: 18807PTVS28VS1UR,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TPSMP33-E3/84A is determined by electrical and mechanical compatibility across the following critical parameters:

Voltage specifications must align within acceptable tolerances: reverse standoff voltage (26.8V nominal), breakdown voltage minimum (29.7V), and clamping voltage maximum (47.7V). The substitute part must maintain unidirectional Zener-type operation with a single channel configuration.

Current handling capability must meet or exceed the 8.4A peak pulse specification at the 10/1000µs waveform. Power dissipation capacity must support the 400W peak pulse requirement.

Package and mounting compatibility are essential: the substitute must be a surface mount device. While the original uses DO-220AA packaging, functionally equivalent alternatives may employ different surface mount packages provided electrical performance remains within specification.

Operating temperature range and compliance certifications (RoHS3) must be maintained or exceeded.

Parameter Comparison

Engineering Selection Recommendations

The PTVS28VS1UR,115 (Nexperia USA Inc.) is the manufacturer-recommended substitute for the obsolete TPSMP33-E3/84A. This substitution is supported by electrical parameter alignment and active product status.

Electrical compatibility is established: the reverse standoff voltage (28V) and breakdown voltage (31.1V) remain within acceptable operating margins relative to the original 26.8V and 29.7V specifications. The clamping voltage (45.4V) is lower than the original 47.7V, providing improved transient suppression performance. Peak pulse current capability (8.8A) exceeds the original 8.4A requirement, ensuring adequate protection margin.

Both components maintain identical power dissipation capacity (400W) and unidirectional Zener-type operation with single-channel configuration. RoHS3 compliance is preserved in the substitute.

The PTVS28VS1UR,115 carries AEC-Q101 automotive qualification, indicating enhanced reliability screening and process controls. The component is in active production status with substantial inventory availability (18,760 units), ensuring supply chain continuity.

Package transition from DO-220AA to SOD-123W requires PCB layout modification. Both are surface mount packages; design verification of footprint compatibility and thermal management is necessary during implementation.

Operating temperature range is reduced from -65°C to 185°C (junction) to -55°C to 150°C (ambient). Applications requiring the full original temperature range must evaluate this limitation against specific system requirements.

Frequently Asked Questions (FAQ)

Q: Can the PTVS28VS1UR,115 directly replace the TPSMP33-E3/84A without circuit modification?

A: Electrical substitution is valid based on voltage and current specifications. However, package transition from DO-220AA to SOD-123W requires PCB footprint redesign. Circuit-level modifications are not necessary if thermal and layout constraints are addressed.

Q: What is the significance of the voltage parameter differences (26.8V vs. 28V standoff)?

A: The 1.2V difference in reverse standoff voltage is within normal component tolerance bands for TVS diodes. The substitute's slightly higher standoff voltage (28V) and lower clamping voltage (45.4V) actually improve transient suppression performance in most general-purpose applications.

Q: Does the reduced operating temperature range (-55°C to 150°C vs. -65°C to 185°C) affect suitability?

A: Temperature range reduction must be evaluated against specific application requirements. For standard industrial and commercial environments operating within -55°C to 150°C, the substitute is fully suitable. Applications requiring extended temperature operation beyond these limits require alternative component selection.

Q: Why is the PTVS28VS1UR,115 packaged in SOD-123W instead of DO-220AA?

A: SOD-123W is a modern surface mount package offering improved thermal performance and manufacturing efficiency compared to legacy DO-220AA packages. Both are surface mount technologies; package selection reflects current industry standards and manufacturing practices.

Q: What does AEC-Q101 qualification mean for this substitute?

A: AEC-Q101 is an automotive industry qualification standard indicating the component has undergone enhanced reliability testing, process controls, and quality assurance. This qualification provides additional confidence in component performance and longevity, though it is not required for general-purpose applications.

Q: Is the 8.8A peak pulse current of the substitute adequate?

A: Yes. The substitute's 8.8A peak pulse current exceeds the original 8.4A requirement, providing a 4.8% performance margin. This ensures the substitute maintains or improves protection capability in the target application.