P4SMA400 Equivalent & Substitute Parts

Part Overview

The P4SMA400 is a unidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) surface mount package, manufactured by Littelfuse Inc. This component is designed for general-purpose transient voltage protection with a reverse standoff voltage of 342V and peak pulse power rating of 400W. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	342V
Voltage - Breakdown (Min)	361V
Voltage - Clamping (Max) @ Ipp	575.4V
Current - Peak Pulse (10/1000µs)	800mA
Power - Peak Pulse	400W
Package / Case	DO-214AC, SMA
Operating Temperature Range	-65°C ~ 150°C (TJ)
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitution for the P4SMA400 is determined by the following critical parameters:

Voltage Rating Match: Reverse standoff voltage of 342V ± tolerance and clamping voltage within acceptable operational range
Current Handling: Peak pulse current capability of 800mA or higher
Power Dissipation: Peak pulse power rating of 400W or higher
Package Compatibility: DO-214AC (SMA) surface mount package
Unidirectional Configuration: Single channel TVS diode
Temperature Range: Operating temperature capability from -55°C to 150°C minimum

The substitute parts listed below meet these core electrical and mechanical requirements, though individual specifications may vary within acceptable engineering tolerances for the application category.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package	Product Status
P4SMA400	Littelfuse Inc.	342V	575.4V	800mA	400W	-65°C ~ 150°C	DO-214AC (SMA)	Obsolete
P4SMA400A	Eaton - Electronics Division	342V	548V	800mA	400W	-55°C ~ 150°C	DO-214AC, SMA	Active
P4SMA400A-M3/5A	Vishay General Semiconductor - Diodes Division	342V	548V	550mA	300W	-65°C ~ 150°C	DO-214AC (SMA)	Active
P4SMA400A-M3/61	Vishay General Semiconductor - Diodes Division	342V	548V	550mA	300W	-65°C ~ 150°C	DO-214AC (SMA)	Active
PSMAJ400A-13	Diodes Incorporated	342V	548V	730mA	400W	-55°C ~ 150°C	DO-214AC, SMA	Active
SMAJP4KE400A-TP	Micro Commercial Co	342V	548V	800mA	400W	-55°C ~ 175°C	DO-214AC (SMAJ)	Active

Engineering Selection Recommendations

Primary Substitute - Direct Replacement: P4SMA400A (Eaton) provides the closest electrical match with 800mA peak pulse current and 400W power rating. This part is active and maintains the same voltage specifications as the original P4SMA400.

Alternative with Extended Temperature Range: P4SMA400A-M3/5A and P4SMA400A-M3/61 (Vishay) both support the full -65°C to 150°C operating temperature range matching the original part. These parts have reduced peak pulse current (550mA) and power rating (300W), suitable for applications with lower transient stress requirements.

High-Current Alternative: PSMAJ400A-13 (Diodes Incorporated) maintains 400W power rating with 730mA peak pulse current capability and RoHS3 compliance. Operating temperature range is -55°C to 150°C.

Extended Temperature Capability: SMAJP4KE400A-TP (Micro Commercial Co) supports operating temperatures to 175°C with full 800mA current and 400W power specifications, suitable for high-temperature applications.

All substitute parts maintain the critical 342V reverse standoff voltage and DO-214AC (SMA) package compatibility required for direct board-level substitution.

Frequently Asked Questions (FAQ)

Q: Can P4SMA400A-M3/5A replace P4SMA400 in all applications? A: P4SMA400A-M3/5A has reduced peak pulse current (550mA vs 800mA) and power rating (300W vs 400W). It is suitable only for applications where transient stress levels are within these reduced specifications. Verify circuit requirements before substitution.

Q: What is the difference between P4SMA400A-M3/5A and P4SMA400A-M3/61? A: Both parts are manufactured by Vishay and share identical electrical specifications. The designation suffix indicates different packaging or tape configurations. Electrical performance is equivalent.

Q: Is SMAJP4KE400A-TP compatible with the original P4SMA400 footprint? A: Yes. SMAJP4KE400A-TP uses DO-214AC (SMAJ) package, which is mechanically and electrically compatible with DO-214AC (SMA) footprints. Pin configuration and lead spacing are identical.

Q: Which substitute has the best RoHS compliance status? A: P4SMA400A-M3/5A, P4SMA400A-M3/61, and PSMAJ400A-13 are all RoHS3 compliant. P4SMA400A (Eaton) is RoHS non-compliant. SMAJP4KE400A-TP compliance status was not specified in available data.

Q: Can I use PSMAJ400A-13 if my circuit operates at -65°C? A: PSMAJ400A-13 has a minimum operating temperature of -55°C. For applications requiring -65°C operation, use P4SMA400A-M3/5A, P4SMA400A-M3/61, or the original P4SMA400 specification.

Q: What is the voltage clamping difference between P4SMA400 (575.4V) and substitute parts (548V)? A: The original P4SMA400 has a higher clamping voltage of 575.4V. Substitute parts clamp at 548V, providing tighter voltage regulation. This is acceptable for most applications but verify circuit protection requirements if precise clamping voltage is critical.

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