Equivalent & Substitute Parts for P4SMA43 TVS Diode

Part Overview

The P4SMA43 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient protection applications. This component features a 36.8V reverse standoff voltage with a 62.27V maximum clamping voltage and 6.9A peak pulse current capability in a surface-mount DO-214AC (SMA) package. The P4SMA43 is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

P4SMA43

Littelfuse Inc.In Stock: 2346P4SMA43 Datasheet

Current PartRFQ

P4SMA43A

Eaton - Electronics DivisionIn Stock: 300373P4SMA43A Datasheet

DirectRFQ

P4SMA43A

Eaton - Electronics DivisionIn Stock: 300373P4SMA43A Datasheet

DirectRFQ

SMAJP4KE43A-TP

Micro Commercial CoIn Stock: 1186SMAJP4KE43A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the P4SMA43 are qualified based on the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 36.8V (exact match required)
• Current - Peak Pulse (10/1000µs): 6.9A (exact match required)
• Power - Peak Pulse: 400W (exact match required)
• Package / Case: DO-214AC, SMA (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Type: Zener, Unidirectional (exact match required)

Substitute parts may vary within acceptable ranges for voltage clamping characteristics (59.3V to 62.27V) and operating temperature ranges, provided all primary electrical ratings and package specifications remain compatible with the original design requirements.

Parameter Comparison

Engineering Selection Recommendations

P4SMA43A (Eaton - Electronics Division): This substitute maintains identical reverse standoff voltage (36.8V) and peak pulse current (6.9A) specifications. The clamping voltage is reduced to 59.3V, which is within acceptable transient suppression performance. The part is currently in active production status with extensive inventory availability (300,300 pcs). RoHS compliance and MSL 1 rating ensure compatibility with modern manufacturing processes. Operating temperature range is -55°C to 150°C, which covers most standard industrial applications.

SMAJP4KE43A-TP (Micro Commercial Co): This manufacturer-recommended substitute provides identical electrical performance to P4SMA43A with an extended operating temperature range of -55°C to 175°C. The part is actively produced with ROHS3 compliance and REACH unaffected status. This option is suitable for applications requiring higher temperature operation or enhanced thermal margin.

Both substitute parts are electrically and mechanically compatible with the obsolete P4SMA43, with active production status ensuring long-term availability.

Frequently Asked Questions (FAQ)

Q: Can P4SMA43A or SMAJP4KE43A-TP be used as direct replacements for P4SMA43?

A: Yes. Both substitute parts maintain the critical electrical parameters: 36.8V reverse standoff voltage, 6.9A peak pulse current, and 400W peak pulse power. All three parts use identical DO-214AC (SMA) surface-mount packaging. The primary difference is the clamping voltage specification (59.3V versus 62.27V), which remains within acceptable transient suppression performance for general-purpose applications.

Q: What is the difference between the two substitute options?

A: P4SMA43A (Eaton) and SMAJP4KE43A-TP (Micro Commercial Co) have identical electrical specifications. The key distinction is the operating temperature range: Eaton's part operates from -55°C to 150°C, while Micro Commercial Co's part extends to 175°C. Select based on your application's thermal requirements and preferred supplier.

Q: Are there any compliance or packaging differences?

A: Both substitutes are RoHS compliant and feature MSL 1 (Unlimited) moisture sensitivity ratings. P4SMA43A is supplied in Tape & Reel packaging, while SMAJP4KE43A-TP is also supplied in Tape & Reel format. Both are suitable for automated assembly processes.

Q: Why is the clamping voltage lower in the substitute parts?

A: The substitute parts (P4SMA43A and SMAJP4KE43A-TP) specify a maximum clamping voltage of 59.3V compared to the original 62.27V. This represents tighter voltage regulation and improved transient suppression performance, making these parts functionally superior for protection applications.

Q: Is the lower operating temperature minimum (-55°C vs -65°C) a concern?

A: For most industrial and commercial applications operating above -55°C, this is not a limitation. If your design requires operation below -55°C, verify that the substitute part's minimum temperature specification meets your specific application requirements.