P4SMA39 Equivalent & Substitute Parts

Part Overview

The P4SMA39 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 33.3V reverse standoff voltage with a 56.6V maximum clamping voltage and 7.6A peak pulse current capability in a DO-214AC (SMA) package. The P4SMA39 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

P4SMA39

Littelfuse Inc.In Stock: 1164P4SMA39 Datasheet

Current PartRFQ

P4SMA39A

Eaton - Electronics DivisionIn Stock: 2442P4SMA39A Datasheet

DirectRFQ

P4SMA39A

Eaton - Electronics DivisionIn Stock: 2442P4SMA39A Datasheet

DirectRFQ

SMAJP4KE39A-TP

Micro Commercial CoIn Stock: 5116SMAJP4KE39A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the P4SMA39 is determined by the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff: 33.3V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 53.9V to 56.6V (acceptable range for functional equivalence)
• Current - Peak Pulse (10/1000µs): 7.6A (exact match required)
• Power - Peak Pulse: 400W (exact match required)
• Package / Case: DO-214AC, SMA (mechanical compatibility required)
• Mounting Type: Surface Mount (required for PCB assembly compatibility)
• Unidirectional Channels: 1 (functional requirement)
• Type: Zener (device classification)

The identified substitute parts maintain these core electrical specifications within acceptable tolerances while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

Both P4SMA39A (Eaton) and SMAJP4KE39A-TP (Micro Commercial Co) are active product alternatives to the obsolete P4SMA39. Selection between these substitutes is based on the following factors:

P4SMA39A (Eaton - Electronics Division): This part maintains identical reverse standoff voltage and peak pulse current specifications. The clamping voltage is reduced to 53.9V, which is within acceptable operational tolerance for general-purpose TVS applications. The operating temperature range is -55°C to 150°C. RoHS compliance is confirmed. This part is suitable for applications where the lower minimum operating temperature of -55°C is acceptable.

SMAJP4KE39A-TP (Micro Commercial Co): This part also maintains identical reverse standoff voltage and peak pulse current specifications with the same 53.9V clamping voltage. The operating temperature range extends to -55°C to 175°C, providing superior high-temperature performance. ROHS3 compliance and REACH unaffected status are confirmed. This part is supplied in Tape & Reel packaging, which is standard for high-volume production environments. This part is suitable for applications requiring extended high-temperature operation or production automation.

Both substitutes are RoHS compliant and carry identical ECCN and HTSUS classifications as the original part.

Frequently Asked Questions (FAQ)

Q: Can P4SMA39A and SMAJP4KE39A-TP be used interchangeably with the original P4SMA39?

A: Both parts maintain the critical electrical parameters required for substitution: 33.3V reverse standoff voltage, 7.6A peak pulse current, and 400W peak pulse power. The clamping voltage difference (53.9V versus 56.6V) is within acceptable tolerance for general-purpose overvoltage protection. Both are surface-mount devices in DO-214AC (SMA) packages with identical pinout and footprint compatibility.

Q: What is the difference between the clamping voltages?

A: The P4SMA39 specifies a maximum clamping voltage of 56.6V, while both substitute parts specify 53.9V. This 2.7V difference represents a tighter clamping characteristic in the substitute parts, which provides improved transient suppression performance in most applications.

Q: Are there temperature range considerations for substitution?

A: The original P4SMA39 operates from -65°C to 150°C. Both substitutes operate from -55°C to 150°C, representing a 10°C reduction in minimum operating temperature. The SMAJP4KE39A-TP extends the maximum operating temperature to 175°C. Applications requiring operation below -55°C would require design review.

Q: What is the significance of the Tape & Reel packaging for SMAJP4KE39A-TP?

A: Tape & Reel (TR) packaging is standard for automated surface-mount assembly processes. This packaging format is suitable for high-volume production environments and is compatible with standard pick-and-place equipment. The P4SMA39A does not specify packaging format in the provided data.

Q: Are both substitutes RoHS compliant?

A: Yes. The P4SMA39A is RoHS compliant, and the SMAJP4KE39A-TP is ROHS3 compliant. Both meet environmental and regulatory requirements for electronic component manufacturing and use.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: All three parts, including the original P4SMA39 and both substitutes, carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity restrictions for storage or handling.