P4SMA33 Equivalent & Substitute Parts

Part Overview

The P4SMA33 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 28.2V reverse standoff voltage with a 47.99V maximum clamping voltage and 9A peak pulse current capability in a surface-mount DO-214AC (SMA) package. The P4SMA33 is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and procurement continuity.

Substiute Parts

P4SMA33

Littelfuse Inc.In Stock: 2358P4SMA33 Datasheet

Current PartRFQ

P4SMA33A

Eaton - Electronics DivisionIn Stock: 2902P4SMA33A Datasheet

MFR RecommendedRFQ

P4SMA33A

Eaton - Electronics DivisionIn Stock: 2902P4SMA33A Datasheet

MFR RecommendedRFQ

SMAJP4KE33A-TP

Micro Commercial CoIn Stock: 1173SMAJP4KE33A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4SMA33 are qualified based on the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 28.2V
• Voltage - Clamping (Max) @ Ipp: 45.7V to 47.99V range
• Current - Peak Pulse (10/1000µs): 9A
• Power - Peak Pulse: 400W
• Package / Case: DO-214AC, SMA
• Type: Zener, Unidirectional

The identified substitute parts maintain compatibility within these specified parameters. Variations in breakdown voltage minimum and operating temperature ranges are within acceptable engineering tolerances for this component category.

Parameter Comparison

Engineering Selection Recommendations

Both P4SMA33A (Eaton - Electronics Division) and SMAJP4KE33A-TP (Micro Commercial Co) are active product alternatives to the obsolete P4SMA33. Selection between these substitutes should be based on the following factors:

P4SMA33A is recommended for applications requiring RoHS compliance certification and established telecom application support. This part maintains the same reverse standoff voltage and package configuration as the original P4SMA33.

SMAJP4KE33A-TP is recommended for applications requiring extended operating temperature range to 175°C and general-purpose protection circuits. This part offers the widest thermal operating window among the available substitutes.

Both substitute parts maintain electrical compatibility within the specified parameter ranges and are available in the same DO-214AC (SMA) surface-mount package, enabling direct board-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can P4SMA33A and SMAJP4KE33A-TP be used interchangeably with the P4SMA33?

A: Both parts are electrically compatible substitutes. They maintain the same reverse standoff voltage (28.2V), peak pulse current (9A), and power dissipation (400W). The primary differences are product status (both active versus obsolete), operating temperature ranges, and compliance certifications. Direct substitution is supported at the board level without circuit redesign.

Q: What is the significance of the voltage clamping difference between P4SMA33 (47.99V) and the substitutes (45.7V)?

A: The clamping voltage represents the maximum voltage across the diode during transient suppression. The P4SMA33A and SMAJP4KE33A-TP exhibit lower clamping voltages (45.7V), which provides improved transient suppression performance. This difference is within acceptable engineering tolerances for the P4SMA series and does not preclude substitution.

Q: Are there packaging differences between these parts?

A: All three parts use the DO-214AC (SMA) surface-mount package. P4SMA33A is available in Cut Tape (CT) and Digi-Reel packaging, while SMAJP4KE33A-TP is supplied in bulk packaging. These packaging variations do not affect electrical performance or board-level compatibility.

Q: Which substitute is better for high-temperature applications?

A: SMAJP4KE33A-TP supports an operating temperature range of -55°C to 175°C, compared to P4SMA33A's -55°C to 150°C range. For applications requiring operation above 150°C junction temperature, SMAJP4KE33A-TP is the appropriate selection.

Q: Do the substitute parts meet the same compliance standards as the original P4SMA33?

A: P4SMA33A is RoHS compliant. SMAJP4KE33A-TP is REACH unaffected. Both parts carry the same ECCN (EAR99) and HTSUS (8541.10.0080) classifications as the original P4SMA33. Compliance requirements should be verified against specific application and regional standards.