P4SMA33A Equivalent & Substitute Parts

Part Overview

The P4SMA33A is an active Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. This unidirectional Zener diode operates with a reverse standoff voltage of 28.2V and provides clamping protection at 45.7V with a peak pulse current rating of 9A. The component is packaged in DO-214AC (SMA) format and is RoHS3 compliant with unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the TVS diode category.

Substiute Parts

P4SMA33A

Littelfuse Inc.In Stock: 2922P4SMA33A Datasheet

Current PartRFQ

P4SMA33A

Eaton - Electronics DivisionIn Stock: 2902P4SMA33A Datasheet

MFR RecommendedRFQ

P4SMA33A

Eaton - Electronics DivisionIn Stock: 2902P4SMA33A Datasheet

MFR RecommendedRFQ

SMAJ33A-TP

Micro Commercial CoIn Stock: 4841SMAJ33A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4SMA33A is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 28.2V
• Voltage - Clamping (Max) @ Ipp: 45.7V
• Current - Peak Pulse (10/1000µs): 9A
• Package / Case: DO-214AC, SMA
• Type: Unidirectional Zener
• Mounting Type: Surface Mount

Identified Substitute Parts:

The P4SMA33A (Littelfuse Inc.) has direct equivalents from Eaton - Electronics Division, also designated P4SMA33A, which maintain identical electrical specifications and packaging. The SMAJ33A-TP (Micro Commercial Co) represents a related but distinct substitute with different voltage and current ratings, suitable only where the higher clamping voltage (53.3V) and lower peak pulse current (7.5A) are acceptable within the application circuit design.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Recommended for Drop-In Replacement): The P4SMA33A from Eaton - Electronics Division is a direct equivalent to the Littelfuse P4SMA33A, maintaining identical electrical specifications (28.2V standoff, 45.7V clamping, 9A peak pulse current) and mechanical packaging. Both parts are active products with RoHS compliance and unlimited moisture sensitivity rating. This substitute provides full functional interchangeability without circuit redesign.

Alternative Substitute (Application-Dependent): The SMAJ33A-TP from Micro Commercial Co operates at higher voltage levels (33V standoff, 53.3V clamping) with reduced peak pulse current (7.5A). This part is suitable only in applications where the elevated clamping voltage and lower current rating are compatible with the protected circuit design. The SMAJ33A-TP offers an extended operating temperature range (-55 to 175°C) and is RoHS3 compliant. Selection of this substitute requires circuit-level analysis to confirm voltage and current compatibility.

Frequently Asked Questions (FAQ)

Q: Can the P4SMA33A (Eaton) be used as a direct replacement for the P4SMA33A (Littelfuse)? A: Yes. Both parts share identical electrical specifications (28.2V reverse standoff, 45.7V clamping voltage, 9A peak pulse current) and DO-214AC (SMA) packaging. No circuit modifications are required.

Q: What are the key differences between the P4SMA33A and SMAJ33A-TP? A: The SMAJ33A-TP operates at higher voltage levels (33V standoff vs. 28.2V, 53.3V clamping vs. 45.7V) with lower peak pulse current (7.5A vs. 9A). These differences make the SMAJ33A-TP suitable only for applications where higher clamping voltage is acceptable.

Q: Are all substitute parts compatible with the same PCB footprint? A: Yes. All listed substitutes use the DO-214AC (SMA) package, which maintains identical mechanical dimensions and PCB footprint compatibility.

Q: What compliance certifications apply to these parts? A: The P4SMA33A (Littelfuse) and SMAJ33A-TP are RoHS3 compliant. The P4SMA33A (Eaton) is RoHS compliant. All parts are REACH unaffected and carry ECCN EAR99 classification.

Q: Does operating temperature range affect substitution decisions? A: The P4SMA33A (Littelfuse) operates from -65 to 150°C (junction temperature), while the Eaton equivalent operates from -55 to 150°C. The SMAJ33A-TP extends to -55 to 175°C. Selection depends on the application's thermal requirements.