Equivalent & Substitute Parts for P4SMA30 TVS Diode

Part Overview

The P4SMA30 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 25.6V reverse standoff voltage with a 43.47V maximum clamping voltage and 9.9A peak pulse current capability in a DO-214AC (SMA) package.

The P4SMA30 is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across critical parameters while meeting current manufacturing and compliance standards.

Substiute Parts

P4SMA30

Littelfuse Inc.In Stock: 2448P4SMA30 Datasheet

Current PartRFQ

P4SMA30A

Eaton - Electronics DivisionIn Stock: 1632P4SMA30A Datasheet

MFR RecommendedRFQ

P4SMA30A

Eaton - Electronics DivisionIn Stock: 1632P4SMA30A Datasheet

MFR RecommendedRFQ

RSA30LTE25

Rohm SemiconductorIn Stock: 5340RSA30LTE25 Datasheet

MFR RecommendedRFQ

SMAJP4KE30A-TP

Micro Commercial CoIn Stock: 804SMAJP4KE30A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the P4SMA30 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 25.6V (exact match required)
• Voltage - Clamping (Max) @ Ipp: within acceptable range for circuit protection
• Current - Peak Pulse (10/1000µs): minimum 9.9A
• Power - Peak Pulse: minimum 400W
• Type: Zener diode, unidirectional configuration

Mechanical Compatibility Criteria:

• Package / Case: DO-214AC or SMA equivalent
• Mounting Type: Surface Mount
• Unidirectional Channels: 1

Compliance Criteria:

• RoHS Status: RoHS3 or RoHS Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts must satisfy all electrical parameters within the specified tolerances and maintain mechanical compatibility with the original PCB footprint and assembly process.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: P4SMA30A (Eaton - Electronics Division)

The P4SMA30A is the manufacturer-recommended substitute and represents the most direct replacement for the obsolete P4SMA30. This part maintains identical reverse standoff voltage (25.6V), peak pulse current (9.9A), and power dissipation (400W) specifications. The clamping voltage is reduced from 43.47V to 41.4V, which provides improved circuit protection margins. The P4SMA30A carries Active product status and is RoHS Compliant, ensuring long-term availability and regulatory compliance. Inventory availability is confirmed at 1530 pieces.

Secondary Recommendation: SMAJP4KE30A-TP (Micro Commercial Co)

The SMAJP4KE30A-TP provides equivalent electrical performance with identical standoff voltage, peak pulse current, and power dissipation. This part is Active status and ROHS3 Compliant. The extended operating temperature range (-55 to 175°C) offers additional thermal margin for high-temperature applications. Inventory availability is confirmed at 790 pieces. The DO-214AC (SMAJ) package variant maintains mechanical compatibility with standard SMA footprints.

Alternative Consideration: RSA30LTE25 (Rohm Semiconductor)

The RSA30LTE25 maintains the required 25.6V reverse standoff voltage and 41.4V clamping voltage. This part features enhanced current handling capability (14.4A at 8/20µs pulse) and increased power dissipation (600W), providing additional design margin for high-energy transient events. However, the RSA30LTE25 is classified as Not For New Designs, limiting its suitability for new product development. The PMDS package variant requires verification of PCB footprint compatibility. Inventory availability is confirmed at 5314 pieces.

Frequently Asked Questions (FAQ)

Q: Can the P4SMA30A directly replace the P4SMA30 without PCB modifications?

A: Yes. The P4SMA30A maintains the same reverse standoff voltage (25.6V), peak pulse current (9.9A), and DO-214AC (SMA) package footprint. The reduced clamping voltage (41.4V vs. 43.47V) provides improved protection without requiring circuit redesign.

Q: What is the difference between the 10/1000µs and 8/20µs pulse specifications?

A: These represent different test pulse waveforms. The 10/1000µs waveform is standard for TVS diode characterization in most applications. The RSA30LTE25 specifies 14.4A at the 8/20µs waveform, which is a shorter, higher-amplitude pulse. Both parts meet the P4SMA30 electrical requirements under their respective test conditions.

Q: Are the PMDS and SMA packages mechanically interchangeable?

A: No. While both are surface-mount packages for DO-214AC devices, the PMDS package (RSA30LTE25) has different lead geometry and spacing compared to the standard SMA package. PCB footprint verification is required before substitution.

Q: Why is the P4SMA30A recommended over the RSA30LTE25 despite lower current rating?

A: The P4SMA30A is Active status, ensuring long-term availability and manufacturing support. The RSA30LTE25 is Not For New Designs, indicating Rohm Semiconductor is discontinuing this product line. For new designs and ongoing production, the P4SMA30A provides superior supply chain reliability.

Q: Do all substitute parts meet the same RoHS compliance level?

A: The P4SMA30A is RoHS Compliant, while the P4SMA30 (original), RSA30LTE25, and SMAJP4KE30A-TP are ROHS3 Compliant. Both compliance levels satisfy current regulatory requirements. ROHS3 represents the most current standard.

Q: What is the impact of the reduced operating temperature range in the P4SMA30A?

A: The P4SMA30A operates from -55 to 150°C, compared to the original -65 to 150°C. For applications requiring operation below -55°C, the SMAJP4KE30A-TP (-55 to 175°C) provides extended low-temperature capability. Most commercial and industrial applications operate within the -55 to 150°C range.