P4SMA56 Equivalent & Substitute Parts

Part Overview

The P4SMA56 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. This component features a 47.8V reverse standoff voltage and 80.85V maximum clamping voltage with 5.3A peak pulse current capability in a DO-214AC (SMA) package.

The P4SMA56 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Manufacturer Part Number	P4SMA56
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	47.8V
Voltage - Breakdown (Min)	50.54V
Voltage - Clamping (Max) @ Ipp	80.85V
Current - Peak Pulse (10/1000µs)	5.3A
Power - Peak Pulse	400W
Operating Temperature Range	-65°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-214AC, SMA
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the P4SMA56 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must be 47.8V
Unidirectional Channels: Must be 1
Mounting Type: Must be Surface Mount
Package / Case: Must be DO-214AC, SMA
Type: Must be Zener
Current - Peak Pulse (10/1000µs): Must be ≥5.2A
Power - Peak Pulse: Must be ≥400W
Voltage - Clamping (Max) @ Ipp: Must be ≤80.85V
Operating Temperature Range: Must support minimum -55°C to 150°C

All substitute parts listed meet these electrical and mechanical compatibility criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Parameter	P4SMA56 (Littelfuse)	P4SMA56A (Eaton)	P4SMA56A-E3/5A (Vishay)	SMAJP4KE56A-TP (Micro Commercial Co)
Voltage - Reverse Standoff (Typ)	47.8V	47.8V	47.8V	47.8V
Voltage - Breakdown (Min)	50.54V	53.2V	53.2V	53.2V
Voltage - Clamping (Max) @ Ipp	80.85V	77V	77V	77V
Current - Peak Pulse (10/1000µs)	5.3A	5.2A	5.2A	5.3A
Power - Peak Pulse	400W	400W	400W	400W
Operating Temperature Range	-65°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 175°C
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	Not specified
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

All three substitute parts are classified as active products with current manufacturing availability, addressing the obsolescence of the original P4SMA56.

P4SMA56A (Eaton - Electronics Division): This part maintains identical reverse standoff voltage and meets all electrical requirements. It is RoHS compliant and available in high volume (300,400 pcs). The clamping voltage of 77V is lower than the original 80.85V, providing improved transient suppression performance. Operating temperature range is -55°C to 150°C.

P4SMA56A-E3/5A (Vishay General Semiconductor - Diodes Division): This part is ROHS3 compliant and maintains the original operating temperature range of -65°C to 150°C. It is supplied in Tape & Reel packaging and is part of the TransZorb® product line. Electrical parameters are equivalent to the Eaton variant with 77V clamping voltage and 5.2A peak pulse current.

SMAJP4KE56A-TP (Micro Commercial Co): This manufacturer-recommended substitute offers the highest peak pulse current (5.3A) matching the original specification. It supports an extended operating temperature range of -55°C to 175°C. This part is supplied in bulk packaging.

Selection should be based on application requirements for operating temperature range, packaging format, and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can P4SMA56A be used as a direct replacement for P4SMA56?

A: Yes. Both parts share identical reverse standoff voltage (47.8V), unidirectional channel configuration, and DO-214AC (SMA) package. The P4SMA56A clamping voltage of 77V is lower than the original 80.85V, which provides superior transient suppression. Operating temperature range is -55°C to 150°C.

Q: What is the difference between P4SMA56A from Eaton and Vishay?

A: Both parts have identical electrical specifications (47.8V standoff, 77V clamping, 5.2A peak pulse). The Vishay variant (P4SMA56A-E3/5A) maintains the original -65°C to 150°C operating temperature range and is ROHS3 compliant. The Eaton variant operates from -55°C to 150°C and is RoHS compliant. Package format differs: Vishay is supplied in Tape & Reel, Eaton in standard form.

Q: Is SMAJP4KE56A-TP compatible with the original P4SMA56?

A: Yes. This part meets all critical substitution parameters with identical reverse standoff voltage, package type, and power rating. It provides 5.3A peak pulse current matching the original specification and supports an extended temperature range of -55°C to 175°C.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: reverse standoff voltage (47.8V), unidirectional channel configuration (1 channel), DO-214AC (SMA) package, peak pulse current (≥5.2A), power rating (≥400W), and clamping voltage (≤80.85V). All substitute parts meet these criteria.

Q: Are all substitute parts RoHS compliant?

A: P4SMA56A-E3/5A is ROHS3 compliant. P4SMA56A (Eaton) is RoHS compliant. RoHS status for SMAJP4KE56A-TP is not specified in available documentation.

Q: What is the difference in clamping voltage between the original and substitutes?

A: The original P4SMA56 has a maximum clamping voltage of 80.85V. All three substitute parts have a maximum clamping voltage of 77V, which represents improved transient suppression performance while remaining within acceptable design margins for 47.8V standoff voltage applications.

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